zlib 1.1.4
This commit is contained in:
Mark Adler
parent
14763ac7c6
commit
a383133c4e
10
ChangeLog
10
ChangeLog
@ -1,6 +1,16 @@
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ChangeLog file for zlib
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ChangeLog file for zlib
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Changes in 1.1.4 (11 March 2002)
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- ZFREE was repeated on same allocation on some error conditions.
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This creates a security problem described in
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http://www.zlib.org/advisory-2002-03-11.txt
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- Returned incorrect error (Z_MEM_ERROR) on some invalid data
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- Avoid accesses before window for invalid distances with inflate window
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less than 32K.
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- force windowBits > 8 to avoid a bug in the encoder for a window size
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of 256 bytes. (A complete fix will be available in 1.1.5).
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Changes in 1.1.3 (9 July 1998)
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Changes in 1.1.3 (9 July 1998)
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- fix "an inflate input buffer bug that shows up on rare but persistent
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- fix "an inflate input buffer bug that shows up on rare but persistent
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occasions" (Mark)
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occasions" (Mark)
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118
FAQ
118
FAQ
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If your question is not there, please check the zlib home page
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If your question is not there, please check the zlib home page
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http://www.cdrom.com/pub/infozip/zlib/ which may have more recent information.
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http://www.zlib.org which may have more recent information.
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The lastest zlib FAQ is at http://www.gzip.org/zlib/zlib_faq.html
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1) I need a Windows DLL
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1. Is zlib Y2K-compliant?
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2) I need a Visual Basic interface to zlib
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3) compress() returns Z_BUF_ERROR
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4) deflate or inflate returns Z_BUF_ERROR
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5) Where is the zlib documentation (man pages, etc...)?
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6) Why don't you use GNU autoconf, libtool, etc...?
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7) There is a bug in zlib.
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8) I get "undefined reference to gzputc"
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Yes. zlib doesn't handle dates.
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2. Where can I get a Windows DLL version?
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1) I need a Windows DLL
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The zlib sources can be compiled without change to produce a DLL. If you
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want a precompiled DLL, see http://www.winimage.com/zLibDll/ . Questions
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about the zlib DLL should be sent to Gilles Vollant (info@winimage.com).
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The zlib sources can be compiled without change to produce a DLL.
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3. Where can I get a Visual Basic interface to zlib?
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If you want a precompiled DLL, see http://www.winimage.com/zLibDll
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See
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* http://www.winimage.com/zLibDll/cmp-z-it.zip
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* http://www.dogma.net/markn/articles/zlibtool/zlibtool.htm
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* contrib/visual-basic.txt in the zlib distribution
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2) I need a Visual Basic interface to zlib
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4. compress() returns Z_BUF_ERROR
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See http://www.tcfb.com/dowseware/cmp-z-it.zip
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Make sure that before the call of compress, the length of the compressed
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http://web2.airmail.net/markn/articles/zlibtool/zlibtool.htm
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buffer is equal to the total size of the compressed buffer and not
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and contrib/visual-basic.txt
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zero. For Visual Basic, check that this parameter is passed by reference
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("as any"), not by value ("as long").
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3) compress() returns Z_BUF_ERROR
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5. deflate() or inflate() returns Z_BUF_ERROR
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Make sure that before the call of compress, the length of the
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Before making the call, make sure that avail_in and avail_out are not
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compressed buffer is equal to the total size of the compressed buffer
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zero. When setting the parameter flush equal to Z_FINISH, also make sure
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and not zero. For Visual Basic, check that this parameter is passed
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that avail_out is big enough to allow processing all pending input.
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by reference ("as any"), not by value ("as long").
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6. Where's the zlib documentation (man pages, etc.)?
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4) deflate or inflate returns Z_BUF_ERROR
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It's in zlib.h for the moment, and Francis S. Lin has converted it to a
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web page zlib.html. Volunteers to transform this to Unix-style man pages,
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Make sure that before the call avail_in and avail_out are not zero.
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please contact Jean-loup Gailly (jloup@gzip.org). Examples of zlib usage
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5) Where is the zlib documentation (man pages, etc...)?
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It's in zlib.h for the moment. Volunteers to transform this
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to man pages, please contact jloup@gzip.org. Examples of zlib usage
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are in the files example.c and minigzip.c.
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are in the files example.c and minigzip.c.
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7. Why don't you use GNU autoconf or libtool or ...?
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6) Why don't you use GNU autoconf, libtool, etc...?
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Because we would like to keep zlib as a very small and simple
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package. zlib is rather portable and doesn't need much configuration.
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Because we would like to keep zlib as a very small and simple package.
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8. I found a bug in zlib.
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zlib is rather portable and doesn't need much configuration.
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Most of the time, such problems are due to an incorrect usage of
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zlib. Please try to reproduce the problem with a small program and send
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the corresponding source to us at zlib@gzip.org . Do not send
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multi-megabyte data files without prior agreement.
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7) There is a bug in zlib.
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9. Why do I get "undefined reference to gzputc"?
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Most of the time, such problems are due to an incorrect usage
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of zlib. Please try to reproduce the problem with a small
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program and send us the corresponding source at zlib@quest.jpl.nasa.gov
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Do not send multi-megabyte data files without prior agreement.
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8) I get "undefined reference to gzputc"
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If "make test" produces something like
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If "make test" produces something like
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example.o(.text+0x174):
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check that you don't have old files libz.* in /usr/lib, /usr/local/lib
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or /usr/X11R6/lib. Remove old versions then do "make install".
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example.o(.text+0x154): undefined reference to `gzputc'
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check that you don't have old files libz.* in /usr/lib, /usr/local/lib or
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/usr/X11R6/lib. Remove any old versions, then do "make install".
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10. I need a Delphi interface to zlib.
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See the directories contrib/delphi and contrib/delphi2 in the zlib
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distribution.
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11. Can zlib handle .zip archives?
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See the directory contrib/minizip in the zlib distribution.
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12. Can zlib handle .Z files?
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No, sorry. You have to spawn an uncompress or gunzip subprocess, or adapt
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the code of uncompress on your own.
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13. How can I make a Unix shared library?
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make clean
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./configure -s
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make
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14. Why does "make test" fail on Mac OS X?
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Mac OS X already includes zlib as a shared library, and so -lz links the
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shared library instead of the one that the "make" compiled. For zlib
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1.1.3, the two are incompatible due to different compile-time
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options. Simply change the -lz in the Makefile to libz.a, and it will use
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the compiled library instead of the shared one and the "make test" will
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succeed.
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15. I have a question about OttoPDF
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We are not the authors of OttoPDF. The real author is on the OttoPDF web
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site Joel Hainley jhainley@myndkryme.com.
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7
Makefile
7
Makefile
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# Makefile for zlib
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# Makefile for zlib
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# Copyright (C) 1995-1998 Jean-loup Gailly.
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# Copyright (C) 1995-2002 Jean-loup Gailly.
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# For conditions of distribution and use, see copyright notice in zlib.h
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# For conditions of distribution and use, see copyright notice in zlib.h
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# To compile and test, type:
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# To compile and test, type:
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@ -24,7 +24,7 @@ LDFLAGS=-L. -lz
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LDSHARED=$(CC)
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LDSHARED=$(CC)
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CPP=$(CC) -E
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CPP=$(CC) -E
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VER=1.1.3
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VER=1.1.4
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LIBS=libz.a
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LIBS=libz.a
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SHAREDLIB=libz.so
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SHAREDLIB=libz.so
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TEST_OBJS = example.o minigzip.o
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TEST_OBJS = example.o minigzip.o
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DISTFILES = README FAQ INDEX ChangeLog configure Make*[a-z0-9] *.[ch] *.mms \
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DISTFILES = README FAQ INDEX ChangeLog configure Make*[a-z0-9] *.[ch] *.mms \
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algorithm.txt zlib.3 msdos/Make*[a-z0-9] msdos/zlib.def msdos/zlib.rc \
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algorithm.txt zlib.3 zlib.html \
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msdos/Make*[a-z0-9] msdos/zlib.def msdos/zlib.rc \
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nt/Make*[a-z0-9] nt/zlib.dnt amiga/Make*.??? os2/M*.os2 os2/zlib.def \
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nt/Make*[a-z0-9] nt/zlib.dnt amiga/Make*.??? os2/M*.os2 os2/zlib.def \
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contrib/RE*.contrib contrib/*.txt contrib/asm386/*.asm contrib/asm386/*.c \
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contrib/RE*.contrib contrib/*.txt contrib/asm386/*.asm contrib/asm386/*.c \
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contrib/asm386/*.bat contrib/asm386/zlibvc.d?? contrib/asm[56]86/*.?86 \
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contrib/asm386/*.bat contrib/asm386/zlibvc.d?? contrib/asm[56]86/*.?86 \
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# Makefile for zlib
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# Makefile for zlib
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# Copyright (C) 1995-1998 Jean-loup Gailly.
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# Copyright (C) 1995-2002 Jean-loup Gailly.
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# For conditions of distribution and use, see copyright notice in zlib.h
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# For conditions of distribution and use, see copyright notice in zlib.h
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# To compile and test, type:
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# To compile and test, type:
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@ -24,7 +24,7 @@ LDFLAGS=-L. -lz
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LDSHARED=$(CC)
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LDSHARED=$(CC)
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CPP=$(CC) -E
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CPP=$(CC) -E
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VER=1.1.3
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VER=1.1.4
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LIBS=libz.a
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LIBS=libz.a
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SHAREDLIB=libz.so
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SHAREDLIB=libz.so
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TEST_OBJS = example.o minigzip.o
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TEST_OBJS = example.o minigzip.o
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DISTFILES = README FAQ INDEX ChangeLog configure Make*[a-z0-9] *.[ch] *.mms \
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DISTFILES = README FAQ INDEX ChangeLog configure Make*[a-z0-9] *.[ch] *.mms \
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algorithm.txt zlib.3 msdos/Make*[a-z0-9] msdos/zlib.def msdos/zlib.rc \
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algorithm.txt zlib.3 zlib.html \
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msdos/Make*[a-z0-9] msdos/zlib.def msdos/zlib.rc \
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nt/Make*[a-z0-9] nt/zlib.dnt amiga/Make*.??? os2/M*.os2 os2/zlib.def \
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nt/Make*[a-z0-9] nt/zlib.dnt amiga/Make*.??? os2/M*.os2 os2/zlib.def \
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contrib/RE*.contrib contrib/*.txt contrib/asm386/*.asm contrib/asm386/*.c \
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contrib/RE*.contrib contrib/*.txt contrib/asm386/*.asm contrib/asm386/*.c \
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contrib/asm386/*.bat contrib/asm386/zlibvc.d?? contrib/asm[56]86/*.?86 \
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contrib/asm386/*.bat contrib/asm386/zlibvc.d?? contrib/asm[56]86/*.?86 \
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61
README
61
README
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zlib 1.1.3 is a general purpose data compression library. All the code
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zlib 1.1.4 is a general purpose data compression library. All the code
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is thread safe. The data format used by the zlib library
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is thread safe. The data format used by the zlib library
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is described by RFCs (Request for Comments) 1950 to 1952 in the files
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is described by RFCs (Request for Comments) 1950 to 1952 in the files
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ftp://ds.internic.net/rfc/rfc1950.txt (zlib format), rfc1951.txt (deflate
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http://www.ietf.org/rfc/rfc1950.txt (zlib format), rfc1951.txt (deflate
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format) and rfc1952.txt (gzip format). These documents are also available in
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format) and rfc1952.txt (gzip format). These documents are also available in
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other formats from ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html
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other formats from ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html
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@ -14,51 +14,50 @@ except example.c and minigzip.c.
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To compile all files and run the test program, follow the instructions
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To compile all files and run the test program, follow the instructions
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given at the top of Makefile. In short "make test; make install"
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given at the top of Makefile. In short "make test; make install"
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should work for most machines. For Unix: "configure; make test; make install"
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should work for most machines. For Unix: "./configure; make test; make install"
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For MSDOS, use one of the special makefiles such as Makefile.msc.
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For MSDOS, use one of the special makefiles such as Makefile.msc.
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For VMS, use Make_vms.com or descrip.mms.
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For VMS, use Make_vms.com or descrip.mms.
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Questions about zlib should be sent to <zlib@quest.jpl.nasa.gov>, or to
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Questions about zlib should be sent to <zlib@gzip.org>, or to
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Gilles Vollant <info@winimage.com> for the Windows DLL version.
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Gilles Vollant <info@winimage.com> for the Windows DLL version.
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The zlib home page is http://www.cdrom.com/pub/infozip/zlib/
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The zlib home page is http://www.zlib.org or http://www.gzip.org/zlib/
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The official zlib ftp site is ftp://ftp.cdrom.com/pub/infozip/zlib/
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Before reporting a problem, please check this site to verify that
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Before reporting a problem, please check those sites to verify that
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you have the latest version of zlib; otherwise get the latest version and
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you have the latest version of zlib; otherwise get the latest version and
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check whether the problem still exists or not.
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check whether the problem still exists or not.
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Mark Nelson <markn@tiny.com> wrote an article about zlib for the Jan. 1997
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PLEASE read the zlib FAQ http://www.gzip.org/zlib/zlib_faq.html
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before asking for help.
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Mark Nelson <markn@ieee.org> wrote an article about zlib for the Jan. 1997
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issue of Dr. Dobb's Journal; a copy of the article is available in
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issue of Dr. Dobb's Journal; a copy of the article is available in
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http://web2.airmail.net/markn/articles/zlibtool/zlibtool.htm
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http://dogma.net/markn/articles/zlibtool/zlibtool.htm
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The changes made in version 1.1.3 are documented in the file ChangeLog.
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The changes made in version 1.1.4 are documented in the file ChangeLog.
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The main changes since 1.1.2 are:
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The only changes made since 1.1.3 are bug corrections:
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- fix "an inflate input buffer bug that shows up on rare but persistent
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- ZFREE was repeated on same allocation on some error conditions.
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occasions" (Mark)
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This creates a security problem described in
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- fix gzread and gztell for concatenated .gz files (Didier Le Botlan)
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http://www.zlib.org/advisory-2002-03-11.txt
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- fix gzseek(..., SEEK_SET) in write mode
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- Returned incorrect error (Z_MEM_ERROR) on some invalid data
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- fix crc check after a gzeek (Frank Faubert)
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- Avoid accesses before window for invalid distances with inflate window
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- fix miniunzip when the last entry in a zip file is itself a zip file
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less than 32K.
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(J Lillge)
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- force windowBits > 8 to avoid a bug in the encoder for a window size
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- add contrib/asm586 and contrib/asm686 (Brian Raiter)
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of 256 bytes. (A complete fix will be available in 1.1.5).
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See http://www.muppetlabs.com/~breadbox/software/assembly.html
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- add support for Delphi 3 in contrib/delphi (Bob Dellaca)
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The beta version 1.1.5beta includes many more changes. A new official
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- add support for C++Builder 3 and Delphi 3 in contrib/delphi2 (Davide Moretti)
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version 1.1.5 will be released as soon as extensive testing has been
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- do not exit prematurely in untgz if 0 at start of block (Magnus Holmgren)
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completed on it.
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- use macro EXTERN instead of extern to support DLL for BeOS (Sander Stoks)
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- added a FAQ file
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plus many changes for portability.
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Unsupported third party contributions are provided in directory "contrib".
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Unsupported third party contributions are provided in directory "contrib".
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A Java implementation of zlib is available in the Java Development Kit 1.1
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A Java implementation of zlib is available in the Java Development Kit
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http://www.javasoft.com/products/JDK/1.1/docs/api/Package-java.util.zip.html
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http://www.javasoft.com/products/JDK/1.1/docs/api/Package-java.util.zip.html
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See the zlib home page http://www.cdrom.com/pub/infozip/zlib/ for details.
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See the zlib home page http://www.zlib.org for details.
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A Perl interface to zlib written by Paul Marquess <pmarquess@bfsec.bt.co.uk>
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A Perl interface to zlib written by Paul Marquess <pmarquess@bfsec.bt.co.uk>
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is in the CPAN (Comprehensive Perl Archive Network) sites, such as:
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is in the CPAN (Comprehensive Perl Archive Network) sites
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ftp://ftp.cis.ufl.edu/pub/perl/CPAN/modules/by-module/Compress/Compress-Zlib*
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http://www.cpan.org/modules/by-module/Compress/
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A Python interface to zlib written by A.M. Kuchling <amk@magnet.com>
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A Python interface to zlib written by A.M. Kuchling <amk@magnet.com>
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is available in Python 1.5 and later versions, see
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is available in Python 1.5 and later versions, see
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@ -117,7 +116,7 @@ Acknowledgments:
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Copyright notice:
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Copyright notice:
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(C) 1995-1998 Jean-loup Gailly and Mark Adler
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(C) 1995-2002 Jean-loup Gailly and Mark Adler
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This software is provided 'as-is', without any express or implied
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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warranty. In no event will the authors be held liable for any damages
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@ -1,5 +1,5 @@
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/* adler32.c -- compute the Adler-32 checksum of a data stream
|
/* adler32.c -- compute the Adler-32 checksum of a data stream
|
||||||
* Copyright (C) 1995-1998 Mark Adler
|
* Copyright (C) 1995-2002 Mark Adler
|
||||||
* For conditions of distribution and use, see copyright notice in zlib.h
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
||||||
*/
|
*/
|
||||||
|
|
||||||
|
|||||||
@ -1,5 +1,5 @@
|
|||||||
/* compress.c -- compress a memory buffer
|
/* compress.c -- compress a memory buffer
|
||||||
* Copyright (C) 1995-1998 Jean-loup Gailly.
|
* Copyright (C) 1995-2002 Jean-loup Gailly.
|
||||||
* For conditions of distribution and use, see copyright notice in zlib.h
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
||||||
*/
|
*/
|
||||||
|
|
||||||
|
|||||||
2
crc32.c
2
crc32.c
@ -1,5 +1,5 @@
|
|||||||
/* crc32.c -- compute the CRC-32 of a data stream
|
/* crc32.c -- compute the CRC-32 of a data stream
|
||||||
* Copyright (C) 1995-1998 Mark Adler
|
* Copyright (C) 1995-2002 Mark Adler
|
||||||
* For conditions of distribution and use, see copyright notice in zlib.h
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
||||||
*/
|
*/
|
||||||
|
|
||||||
|
|||||||
@ -1,5 +1,5 @@
|
|||||||
/* deflate.c -- compress data using the deflation algorithm
|
/* deflate.c -- compress data using the deflation algorithm
|
||||||
* Copyright (C) 1995-1998 Jean-loup Gailly.
|
* Copyright (C) 1995-2002 Jean-loup Gailly.
|
||||||
* For conditions of distribution and use, see copyright notice in zlib.h
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
||||||
*/
|
*/
|
||||||
|
|
||||||
@ -52,7 +52,7 @@
|
|||||||
#include "deflate.h"
|
#include "deflate.h"
|
||||||
|
|
||||||
const char deflate_copyright[] =
|
const char deflate_copyright[] =
|
||||||
" deflate 1.1.3 Copyright 1995-1998 Jean-loup Gailly ";
|
" deflate 1.1.4 Copyright 1995-2002 Jean-loup Gailly ";
|
||||||
/*
|
/*
|
||||||
If you use the zlib library in a product, an acknowledgment is welcome
|
If you use the zlib library in a product, an acknowledgment is welcome
|
||||||
in the documentation of your product. If for some reason you cannot
|
in the documentation of your product. If for some reason you cannot
|
||||||
@ -242,7 +242,7 @@ int ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
|
|||||||
windowBits = -windowBits;
|
windowBits = -windowBits;
|
||||||
}
|
}
|
||||||
if (memLevel < 1 || memLevel > MAX_MEM_LEVEL || method != Z_DEFLATED ||
|
if (memLevel < 1 || memLevel > MAX_MEM_LEVEL || method != Z_DEFLATED ||
|
||||||
windowBits < 8 || windowBits > 15 || level < 0 || level > 9 ||
|
windowBits < 9 || windowBits > 15 || level < 0 || level > 9 ||
|
||||||
strategy < 0 || strategy > Z_HUFFMAN_ONLY) {
|
strategy < 0 || strategy > Z_HUFFMAN_ONLY) {
|
||||||
return Z_STREAM_ERROR;
|
return Z_STREAM_ERROR;
|
||||||
}
|
}
|
||||||
|
|||||||
@ -1,5 +1,5 @@
|
|||||||
/* deflate.h -- internal compression state
|
/* deflate.h -- internal compression state
|
||||||
* Copyright (C) 1995-1998 Jean-loup Gailly
|
* Copyright (C) 1995-2002 Jean-loup Gailly
|
||||||
* For conditions of distribution and use, see copyright notice in zlib.h
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
||||||
*/
|
*/
|
||||||
|
|
||||||
|
|||||||
@ -1,5 +1,5 @@
|
|||||||
/* example.c -- usage example of the zlib compression library
|
/* example.c -- usage example of the zlib compression library
|
||||||
* Copyright (C) 1995-1998 Jean-loup Gailly.
|
* Copyright (C) 1995-2002 Jean-loup Gailly.
|
||||||
* For conditions of distribution and use, see copyright notice in zlib.h
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
||||||
*/
|
*/
|
||||||
|
|
||||||
|
|||||||
2
gzio.c
2
gzio.c
@ -1,5 +1,5 @@
|
|||||||
/* gzio.c -- IO on .gz files
|
/* gzio.c -- IO on .gz files
|
||||||
* Copyright (C) 1995-1998 Jean-loup Gailly.
|
* Copyright (C) 1995-2002 Jean-loup Gailly.
|
||||||
* For conditions of distribution and use, see copyright notice in zlib.h
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
||||||
*
|
*
|
||||||
* Compile this file with -DNO_DEFLATE to avoid the compression code.
|
* Compile this file with -DNO_DEFLATE to avoid the compression code.
|
||||||
|
|||||||
11
infblock.c
11
infblock.c
@ -1,5 +1,5 @@
|
|||||||
/* infblock.c -- interpret and process block types to last block
|
/* infblock.c -- interpret and process block types to last block
|
||||||
* Copyright (C) 1995-1998 Mark Adler
|
* Copyright (C) 1995-2002 Mark Adler
|
||||||
* For conditions of distribution and use, see copyright notice in zlib.h
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
||||||
*/
|
*/
|
||||||
|
|
||||||
@ -249,10 +249,12 @@ int r;
|
|||||||
&s->sub.trees.tb, s->hufts, z);
|
&s->sub.trees.tb, s->hufts, z);
|
||||||
if (t != Z_OK)
|
if (t != Z_OK)
|
||||||
{
|
{
|
||||||
ZFREE(z, s->sub.trees.blens);
|
|
||||||
r = t;
|
r = t;
|
||||||
if (r == Z_DATA_ERROR)
|
if (r == Z_DATA_ERROR)
|
||||||
|
{
|
||||||
|
ZFREE(z, s->sub.trees.blens);
|
||||||
s->mode = BAD;
|
s->mode = BAD;
|
||||||
|
}
|
||||||
LEAVE
|
LEAVE
|
||||||
}
|
}
|
||||||
s->sub.trees.index = 0;
|
s->sub.trees.index = 0;
|
||||||
@ -313,11 +315,13 @@ int r;
|
|||||||
t = inflate_trees_dynamic(257 + (t & 0x1f), 1 + ((t >> 5) & 0x1f),
|
t = inflate_trees_dynamic(257 + (t & 0x1f), 1 + ((t >> 5) & 0x1f),
|
||||||
s->sub.trees.blens, &bl, &bd, &tl, &td,
|
s->sub.trees.blens, &bl, &bd, &tl, &td,
|
||||||
s->hufts, z);
|
s->hufts, z);
|
||||||
ZFREE(z, s->sub.trees.blens);
|
|
||||||
if (t != Z_OK)
|
if (t != Z_OK)
|
||||||
{
|
{
|
||||||
if (t == (uInt)Z_DATA_ERROR)
|
if (t == (uInt)Z_DATA_ERROR)
|
||||||
|
{
|
||||||
|
ZFREE(z, s->sub.trees.blens);
|
||||||
s->mode = BAD;
|
s->mode = BAD;
|
||||||
|
}
|
||||||
r = t;
|
r = t;
|
||||||
LEAVE
|
LEAVE
|
||||||
}
|
}
|
||||||
@ -329,6 +333,7 @@ int r;
|
|||||||
}
|
}
|
||||||
s->sub.decode.codes = c;
|
s->sub.decode.codes = c;
|
||||||
}
|
}
|
||||||
|
ZFREE(z, s->sub.trees.blens);
|
||||||
s->mode = CODES;
|
s->mode = CODES;
|
||||||
case CODES:
|
case CODES:
|
||||||
UPDATE
|
UPDATE
|
||||||
|
|||||||
@ -1,5 +1,5 @@
|
|||||||
/* infblock.h -- header to use infblock.c
|
/* infblock.h -- header to use infblock.c
|
||||||
* Copyright (C) 1995-1998 Mark Adler
|
* Copyright (C) 1995-2002 Mark Adler
|
||||||
* For conditions of distribution and use, see copyright notice in zlib.h
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
||||||
*/
|
*/
|
||||||
|
|
||||||
|
|||||||
12
infcodes.c
12
infcodes.c
@ -1,5 +1,5 @@
|
|||||||
/* infcodes.c -- process literals and length/distance pairs
|
/* infcodes.c -- process literals and length/distance pairs
|
||||||
* Copyright (C) 1995-1998 Mark Adler
|
* Copyright (C) 1995-2002 Mark Adler
|
||||||
* For conditions of distribution and use, see copyright notice in zlib.h
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
||||||
*/
|
*/
|
||||||
|
|
||||||
@ -196,15 +196,9 @@ int r;
|
|||||||
Tracevv((stderr, "inflate: distance %u\n", c->sub.copy.dist));
|
Tracevv((stderr, "inflate: distance %u\n", c->sub.copy.dist));
|
||||||
c->mode = COPY;
|
c->mode = COPY;
|
||||||
case COPY: /* o: copying bytes in window, waiting for space */
|
case COPY: /* o: copying bytes in window, waiting for space */
|
||||||
#ifndef __TURBOC__ /* Turbo C bug for following expression */
|
|
||||||
f = (uInt)(q - s->window) < c->sub.copy.dist ?
|
|
||||||
s->end - (c->sub.copy.dist - (q - s->window)) :
|
|
||||||
q - c->sub.copy.dist;
|
|
||||||
#else
|
|
||||||
f = q - c->sub.copy.dist;
|
f = q - c->sub.copy.dist;
|
||||||
if ((uInt)(q - s->window) < c->sub.copy.dist)
|
while (f < s->window) /* modulo window size-"while" instead */
|
||||||
f = s->end - (c->sub.copy.dist - (uInt)(q - s->window));
|
f += s->end - s->window; /* of "if" handles invalid distances */
|
||||||
#endif
|
|
||||||
while (c->len)
|
while (c->len)
|
||||||
{
|
{
|
||||||
NEEDOUT
|
NEEDOUT
|
||||||
|
|||||||
@ -1,5 +1,5 @@
|
|||||||
/* infcodes.h -- header to use infcodes.c
|
/* infcodes.h -- header to use infcodes.c
|
||||||
* Copyright (C) 1995-1998 Mark Adler
|
* Copyright (C) 1995-2002 Mark Adler
|
||||||
* For conditions of distribution and use, see copyright notice in zlib.h
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
||||||
*/
|
*/
|
||||||
|
|
||||||
|
|||||||
43
inffast.c
43
inffast.c
@ -1,5 +1,5 @@
|
|||||||
/* inffast.c -- process literals and length/distance pairs fast
|
/* inffast.c -- process literals and length/distance pairs fast
|
||||||
* Copyright (C) 1995-1998 Mark Adler
|
* Copyright (C) 1995-2002 Mark Adler
|
||||||
* For conditions of distribution and use, see copyright notice in zlib.h
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
||||||
*/
|
*/
|
||||||
|
|
||||||
@ -93,28 +93,41 @@ z_streamp z;
|
|||||||
|
|
||||||
/* do the copy */
|
/* do the copy */
|
||||||
m -= c;
|
m -= c;
|
||||||
if ((uInt)(q - s->window) >= d) /* offset before dest */
|
|
||||||
{ /* just copy */
|
|
||||||
r = q - d;
|
r = q - d;
|
||||||
*q++ = *r++; c--; /* minimum count is three, */
|
if (r < s->window) /* wrap if needed */
|
||||||
*q++ = *r++; c--; /* so unroll loop a little */
|
|
||||||
}
|
|
||||||
else /* else offset after destination */
|
|
||||||
{
|
{
|
||||||
e = d - (uInt)(q - s->window); /* bytes from offset to end */
|
do {
|
||||||
r = s->end - e; /* pointer to offset */
|
r += s->end - s->window; /* force pointer in window */
|
||||||
if (c > e) /* if source crosses, */
|
} while (r < s->window); /* covers invalid distances */
|
||||||
|
e = s->end - r;
|
||||||
|
if (c > e)
|
||||||
{
|
{
|
||||||
c -= e; /* copy to end of window */
|
c -= e; /* wrapped copy */
|
||||||
do {
|
do {
|
||||||
*q++ = *r++;
|
*q++ = *r++;
|
||||||
} while (--e);
|
} while (--e);
|
||||||
r = s->window; /* copy rest from start of window */
|
r = s->window;
|
||||||
}
|
do {
|
||||||
}
|
|
||||||
do { /* copy all or what's left */
|
|
||||||
*q++ = *r++;
|
*q++ = *r++;
|
||||||
} while (--c);
|
} while (--c);
|
||||||
|
}
|
||||||
|
else /* normal copy */
|
||||||
|
{
|
||||||
|
*q++ = *r++; c--;
|
||||||
|
*q++ = *r++; c--;
|
||||||
|
do {
|
||||||
|
*q++ = *r++;
|
||||||
|
} while (--c);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
else /* normal copy */
|
||||||
|
{
|
||||||
|
*q++ = *r++; c--;
|
||||||
|
*q++ = *r++; c--;
|
||||||
|
do {
|
||||||
|
*q++ = *r++;
|
||||||
|
} while (--c);
|
||||||
|
}
|
||||||
break;
|
break;
|
||||||
}
|
}
|
||||||
else if ((e & 64) == 0)
|
else if ((e & 64) == 0)
|
||||||
|
|||||||
@ -1,5 +1,5 @@
|
|||||||
/* inffast.h -- header to use inffast.c
|
/* inffast.h -- header to use inffast.c
|
||||||
* Copyright (C) 1995-1998 Mark Adler
|
* Copyright (C) 1995-2002 Mark Adler
|
||||||
* For conditions of distribution and use, see copyright notice in zlib.h
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
||||||
*/
|
*/
|
||||||
|
|
||||||
|
|||||||
@ -1,5 +1,5 @@
|
|||||||
/* inflate.c -- zlib interface to inflate modules
|
/* inflate.c -- zlib interface to inflate modules
|
||||||
* Copyright (C) 1995-1998 Mark Adler
|
* Copyright (C) 1995-2002 Mark Adler
|
||||||
* For conditions of distribution and use, see copyright notice in zlib.h
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
||||||
*/
|
*/
|
||||||
|
|
||||||
|
|||||||
@ -1,5 +1,5 @@
|
|||||||
/* inftrees.c -- generate Huffman trees for efficient decoding
|
/* inftrees.c -- generate Huffman trees for efficient decoding
|
||||||
* Copyright (C) 1995-1998 Mark Adler
|
* Copyright (C) 1995-2002 Mark Adler
|
||||||
* For conditions of distribution and use, see copyright notice in zlib.h
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
||||||
*/
|
*/
|
||||||
|
|
||||||
@ -11,7 +11,7 @@
|
|||||||
#endif
|
#endif
|
||||||
|
|
||||||
const char inflate_copyright[] =
|
const char inflate_copyright[] =
|
||||||
" inflate 1.1.3 Copyright 1995-1998 Mark Adler ";
|
" inflate 1.1.4 Copyright 1995-2002 Mark Adler ";
|
||||||
/*
|
/*
|
||||||
If you use the zlib library in a product, an acknowledgment is welcome
|
If you use the zlib library in a product, an acknowledgment is welcome
|
||||||
in the documentation of your product. If for some reason you cannot
|
in the documentation of your product. If for some reason you cannot
|
||||||
@ -104,8 +104,7 @@ uIntf *v; /* working area: values in order of bit length */
|
|||||||
/* Given a list of code lengths and a maximum table size, make a set of
|
/* Given a list of code lengths and a maximum table size, make a set of
|
||||||
tables to decode that set of codes. Return Z_OK on success, Z_BUF_ERROR
|
tables to decode that set of codes. Return Z_OK on success, Z_BUF_ERROR
|
||||||
if the given code set is incomplete (the tables are still built in this
|
if the given code set is incomplete (the tables are still built in this
|
||||||
case), Z_DATA_ERROR if the input is invalid (an over-subscribed set of
|
case), or Z_DATA_ERROR if the input is invalid. */
|
||||||
lengths), or Z_MEM_ERROR if not enough memory. */
|
|
||||||
{
|
{
|
||||||
|
|
||||||
uInt a; /* counter for codes of length k */
|
uInt a; /* counter for codes of length k */
|
||||||
@ -231,7 +230,7 @@ uIntf *v; /* working area: values in order of bit length */
|
|||||||
|
|
||||||
/* allocate new table */
|
/* allocate new table */
|
||||||
if (*hn + z > MANY) /* (note: doesn't matter for fixed) */
|
if (*hn + z > MANY) /* (note: doesn't matter for fixed) */
|
||||||
return Z_MEM_ERROR; /* not enough memory */
|
return Z_DATA_ERROR; /* overflow of MANY */
|
||||||
u[h] = q = hp + *hn;
|
u[h] = q = hp + *hn;
|
||||||
*hn += z;
|
*hn += z;
|
||||||
|
|
||||||
|
|||||||
@ -1,5 +1,5 @@
|
|||||||
/* inftrees.h -- header to use inftrees.c
|
/* inftrees.h -- header to use inftrees.c
|
||||||
* Copyright (C) 1995-1998 Mark Adler
|
* Copyright (C) 1995-2002 Mark Adler
|
||||||
* For conditions of distribution and use, see copyright notice in zlib.h
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
||||||
*/
|
*/
|
||||||
|
|
||||||
|
|||||||
@ -1,5 +1,5 @@
|
|||||||
/* inflate_util.c -- data and routines common to blocks and codes
|
/* inflate_util.c -- data and routines common to blocks and codes
|
||||||
* Copyright (C) 1995-1998 Mark Adler
|
* Copyright (C) 1995-2002 Mark Adler
|
||||||
* For conditions of distribution and use, see copyright notice in zlib.h
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
||||||
*/
|
*/
|
||||||
|
|
||||||
|
|||||||
@ -1,5 +1,5 @@
|
|||||||
/* infutil.h -- types and macros common to blocks and codes
|
/* infutil.h -- types and macros common to blocks and codes
|
||||||
* Copyright (C) 1995-1998 Mark Adler
|
* Copyright (C) 1995-2002 Mark Adler
|
||||||
* For conditions of distribution and use, see copyright notice in zlib.h
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
||||||
*/
|
*/
|
||||||
|
|
||||||
|
|||||||
@ -1,5 +1,5 @@
|
|||||||
/* maketree.c -- make inffixed.h table for decoding fixed codes
|
/* maketree.c -- make inffixed.h table for decoding fixed codes
|
||||||
* Copyright (C) 1998 Mark Adler
|
* Copyright (C) 1995-2002 Mark Adler
|
||||||
* For conditions of distribution and use, see copyright notice in zlib.h
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
||||||
*/
|
*/
|
||||||
|
|
||||||
|
|||||||
@ -1,5 +1,5 @@
|
|||||||
/* minigzip.c -- simulate gzip using the zlib compression library
|
/* minigzip.c -- simulate gzip using the zlib compression library
|
||||||
* Copyright (C) 1995-1998 Jean-loup Gailly.
|
* Copyright (C) 1995-2002 Jean-loup Gailly.
|
||||||
* For conditions of distribution and use, see copyright notice in zlib.h
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
||||||
*/
|
*/
|
||||||
|
|
||||||
|
|||||||
2
trees.c
2
trees.c
@ -1,5 +1,5 @@
|
|||||||
/* trees.c -- output deflated data using Huffman coding
|
/* trees.c -- output deflated data using Huffman coding
|
||||||
* Copyright (C) 1995-1998 Jean-loup Gailly
|
* Copyright (C) 1995-2002 Jean-loup Gailly
|
||||||
* For conditions of distribution and use, see copyright notice in zlib.h
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
||||||
*/
|
*/
|
||||||
|
|
||||||
|
|||||||
@ -1,5 +1,5 @@
|
|||||||
/* uncompr.c -- decompress a memory buffer
|
/* uncompr.c -- decompress a memory buffer
|
||||||
* Copyright (C) 1995-1998 Jean-loup Gailly.
|
* Copyright (C) 1995-2002 Jean-loup Gailly.
|
||||||
* For conditions of distribution and use, see copyright notice in zlib.h
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
||||||
*/
|
*/
|
||||||
|
|
||||||
|
|||||||
2
zconf.h
2
zconf.h
@ -1,5 +1,5 @@
|
|||||||
/* zconf.h -- configuration of the zlib compression library
|
/* zconf.h -- configuration of the zlib compression library
|
||||||
* Copyright (C) 1995-1998 Jean-loup Gailly.
|
* Copyright (C) 1995-2002 Jean-loup Gailly.
|
||||||
* For conditions of distribution and use, see copyright notice in zlib.h
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
||||||
*/
|
*/
|
||||||
|
|
||||||
|
|||||||
6
zlib.3
6
zlib.3
@ -1,4 +1,4 @@
|
|||||||
.TH ZLIB 3 "9 July 1998"
|
.TH ZLIB 3 "11 March 2002"
|
||||||
.SH NAME
|
.SH NAME
|
||||||
zlib \- compression/decompression library
|
zlib \- compression/decompression library
|
||||||
.SH SYNOPSIS
|
.SH SYNOPSIS
|
||||||
@ -81,8 +81,8 @@ These documents are also available in other formats from:
|
|||||||
.IP
|
.IP
|
||||||
ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html
|
ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html
|
||||||
.SH AUTHORS
|
.SH AUTHORS
|
||||||
Version 1.1.3
|
Version 1.1.4
|
||||||
Copyright (C) 1995-1998 Jean-loup Gailly (jloup@gzip.org)
|
Copyright (C) 1995-2002 Jean-loup Gailly (jloup@gzip.org)
|
||||||
and Mark Adler (madler@alumni.caltech.edu).
|
and Mark Adler (madler@alumni.caltech.edu).
|
||||||
.LP
|
.LP
|
||||||
This software is provided "as-is,"
|
This software is provided "as-is,"
|
||||||
|
|||||||
6
zlib.h
6
zlib.h
@ -1,7 +1,7 @@
|
|||||||
/* zlib.h -- interface of the 'zlib' general purpose compression library
|
/* zlib.h -- interface of the 'zlib' general purpose compression library
|
||||||
version 1.1.3, July 9th, 1998
|
version 1.1.4, March 11th, 2002
|
||||||
|
|
||||||
Copyright (C) 1995-1998 Jean-loup Gailly and Mark Adler
|
Copyright (C) 1995-2002 Jean-loup Gailly and Mark Adler
|
||||||
|
|
||||||
This software is provided 'as-is', without any express or implied
|
This software is provided 'as-is', without any express or implied
|
||||||
warranty. In no event will the authors be held liable for any damages
|
warranty. In no event will the authors be held liable for any damages
|
||||||
@ -37,7 +37,7 @@
|
|||||||
extern "C" {
|
extern "C" {
|
||||||
#endif
|
#endif
|
||||||
|
|
||||||
#define ZLIB_VERSION "1.1.3"
|
#define ZLIB_VERSION "1.1.4"
|
||||||
|
|
||||||
/*
|
/*
|
||||||
The 'zlib' compression library provides in-memory compression and
|
The 'zlib' compression library provides in-memory compression and
|
||||||
|
|||||||
971
zlib.html
Normal file
971
zlib.html
Normal file
@ -0,0 +1,971 @@
|
|||||||
|
<html>
|
||||||
|
<head>
|
||||||
|
<title>
|
||||||
|
zlib general purpose compression library version 1.1.4
|
||||||
|
</title>
|
||||||
|
</head>
|
||||||
|
<body bgcolor="White" text="Black" vlink="Red" alink="Navy" link="Red">
|
||||||
|
<!-- background="zlibbg.gif" -->
|
||||||
|
|
||||||
|
<h1> zlib 1.1.4 Manual </h1>
|
||||||
|
<hr>
|
||||||
|
<a name="Contents"><h2>Contents</h2>
|
||||||
|
<ol type="I">
|
||||||
|
<li> <a href="#Prologue">Prologue</a>
|
||||||
|
<li> <a href="#Introduction">Introduction</a>
|
||||||
|
<li> <a href="#Utility functions">Utility functions</a>
|
||||||
|
<li> <a href="#Basic functions">Basic functions</a>
|
||||||
|
<li> <a href="#Advanced functions">Advanced functions</a>
|
||||||
|
<li> <a href="#Constants">Constants</a>
|
||||||
|
<li> <a href="#struct z_stream_s">struct z_stream_s</a>
|
||||||
|
<li> <a href="#Checksum functions">Checksum functions</a>
|
||||||
|
<li> <a href="#Misc">Misc</a>
|
||||||
|
</ol>
|
||||||
|
<hr>
|
||||||
|
<a name="Prologue"><h2> Prologue </h2>
|
||||||
|
'zlib' general purpose compression library version 1.1.4, March 11th, 2002
|
||||||
|
<p>
|
||||||
|
Copyright (C) 1995-2002 Jean-loup Gailly and Mark Adler
|
||||||
|
<p>
|
||||||
|
This software is provided 'as-is', without any express or implied
|
||||||
|
warranty. In no event will the authors be held liable for any damages
|
||||||
|
arising from the use of this software.
|
||||||
|
<p>
|
||||||
|
Permission is granted to anyone to use this software for any purpose,
|
||||||
|
including commercial applications, and to alter it and redistribute it
|
||||||
|
freely, subject to the following restrictions:
|
||||||
|
<ol>
|
||||||
|
<li> The origin of this software must not be misrepresented ; you must not
|
||||||
|
claim that you wrote the original software. If you use this software
|
||||||
|
in a product, an acknowledgment in the product documentation would be
|
||||||
|
appreciated but is not required.
|
||||||
|
<li> Altered source versions must be plainly marked as such, and must not be
|
||||||
|
misrepresented as being the original software.
|
||||||
|
<li> This notice may not be removed or altered from any source distribution.
|
||||||
|
</ol>
|
||||||
|
|
||||||
|
<dl>
|
||||||
|
<dt>Jean-loup Gailly
|
||||||
|
<dd><a href="mailto:jloup@gzip.org">jloup@gzip.org</a>
|
||||||
|
<dt>Mark Adler
|
||||||
|
<dd><a href="mailto:madler@alumni.caltech.edu">madler@alumni.caltech.edu</a>
|
||||||
|
</dl>
|
||||||
|
|
||||||
|
The data format used by the zlib library is described by RFCs (Request for
|
||||||
|
Comments) 1950 to 1952 in the files
|
||||||
|
<a href="ftp://ds.internic.net/rfc/rfc1950.txt">
|
||||||
|
ftp://ds.internic.net/rfc/rfc1950.txt </a>
|
||||||
|
(zlib format),
|
||||||
|
<a href="ftp://ds.internic.net/rfc/rfc1951.txt">
|
||||||
|
rfc1951.txt </a>
|
||||||
|
(<a href="#deflate">deflate</a> format) and
|
||||||
|
<a href="ftp://ds.internic.net/rfc/rfc1952.txt">
|
||||||
|
rfc1952.txt </a>
|
||||||
|
(gzip format).
|
||||||
|
<p>
|
||||||
|
This manual is converted from zlib.h by
|
||||||
|
<a href="mailto:piaip@csie.ntu.edu.tw"> piaip </a>
|
||||||
|
<p>
|
||||||
|
Visit <a href="http://ftp.cdrom.com/pub/infozip/zlib/">
|
||||||
|
http://ftp.cdrom.com/pub/infozip/zlib/</a>
|
||||||
|
for the official zlib web page.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<hr>
|
||||||
|
<a name="Introduction"><h2> Introduction </h2>
|
||||||
|
The 'zlib' compression library provides in-memory compression and
|
||||||
|
decompression functions, including integrity checks of the uncompressed
|
||||||
|
data. This version of the library supports only one compression method
|
||||||
|
(deflation) but other algorithms will be added later and will have the same
|
||||||
|
stream interface.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
Compression can be done in a single step if the buffers are large
|
||||||
|
enough (for example if an input file is mmap'ed), or can be done by
|
||||||
|
repeated calls of the compression function. In the latter case, the
|
||||||
|
application must provide more input and/or consume the output
|
||||||
|
(providing more output space) before each call.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
The library also supports reading and writing files in gzip (.gz) format
|
||||||
|
with an interface similar to that of stdio.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
The library does not install any signal handler. The decoder checks
|
||||||
|
the consistency of the compressed data, so the library should never
|
||||||
|
crash even in case of corrupted input.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<hr>
|
||||||
|
<a name="Utility functions"><h2> Utility functions </h2>
|
||||||
|
The following utility functions are implemented on top of the
|
||||||
|
<a href="#Basic functions">basic stream-oriented functions</a>.
|
||||||
|
To simplify the interface, some
|
||||||
|
default options are assumed (compression level and memory usage,
|
||||||
|
standard memory allocation functions). The source code of these
|
||||||
|
utility functions can easily be modified if you need special options.
|
||||||
|
<h3> Function list </h3>
|
||||||
|
<ul>
|
||||||
|
<li> int <a href="#compress">compress</a> (Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen);
|
||||||
|
<li> int <a href="#compress2">compress2</a> (Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen, int level);
|
||||||
|
<li> int <a href="#uncompress">uncompress</a> (Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen);
|
||||||
|
<li> typedef voidp gzFile;
|
||||||
|
<li> gzFile <a href="#gzopen">gzopen</a> (const char *path, const char *mode);
|
||||||
|
<li> gzFile <a href="#gzdopen">gzdopen</a> (int fd, const char *mode);
|
||||||
|
<li> int <a href="#gzsetparams">gzsetparams</a> (gzFile file, int level, int strategy);
|
||||||
|
<li> int <a href="#gzread">gzread</a> (gzFile file, voidp buf, unsigned len);
|
||||||
|
<li> int <a href="#gzwrite">gzwrite</a> (gzFile file, const voidp buf, unsigned len);
|
||||||
|
<li> int VA <a href="#gzprintf">gzprintf</a> (gzFile file, const char *format, ...);
|
||||||
|
<li> int <a href="#gzputs">gzputs</a> (gzFile file, const char *s);
|
||||||
|
<li> char * <a href="#gzgets">gzgets</a> (gzFile file, char *buf, int len);
|
||||||
|
<li> int <a href="#gzputc">gzputc</a> (gzFile file, int c);
|
||||||
|
<li> int <a href="#gzgetc">gzgetc</a> (gzFile file);
|
||||||
|
<li> int <a href="#gzflush">gzflush</a> (gzFile file, int flush);
|
||||||
|
<li> z_off_t <a href="#gzseek">gzseek</a> (gzFile file, z_off_t offset, int whence);
|
||||||
|
<li> z_off_t <a href="#gztell">gztell</a> (gzFile file);
|
||||||
|
<li> int <a href="#gzrewind">gzrewind</a> (gzFile file);
|
||||||
|
<li> int <a href="#gzeof">gzeof</a> (gzFile file);
|
||||||
|
<li> int <a href="#gzclose">gzclose</a> (gzFile file);
|
||||||
|
<li> const char * <a href="#gzerror">gzerror</a> (gzFile file, int *errnum);
|
||||||
|
</ul>
|
||||||
|
<h3> Function description </h3>
|
||||||
|
<dl>
|
||||||
|
<font color="Blue"><dt> int <a name="compress">compress</a> (Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen);</font>
|
||||||
|
<dd>
|
||||||
|
Compresses the source buffer into the destination buffer. sourceLen is
|
||||||
|
the byte length of the source buffer. Upon entry, destLen is the total
|
||||||
|
size of the destination buffer, which must be at least 0.1% larger than
|
||||||
|
sourceLen plus 12 bytes. Upon exit, destLen is the actual size of the
|
||||||
|
compressed buffer.<p>
|
||||||
|
This function can be used to <a href="#compress">compress</a> a whole file at once if the
|
||||||
|
input file is mmap'ed.<p>
|
||||||
|
<a href="#compress">compress</a> returns <a href="#Z_OK">Z_OK</a> if success, <a href="#Z_MEM_ERROR">Z_MEM_ERROR</a> if there was not
|
||||||
|
enough memory, <a href="#Z_BUF_ERROR">Z_BUF_ERROR</a> if there was not enough room in the output
|
||||||
|
buffer.<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> int <a name="compress2">compress2</a> (Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen, int level);</font>
|
||||||
|
<dd>
|
||||||
|
Compresses the source buffer into the destination buffer. The level
|
||||||
|
parameter has the same meaning as in <a href="#deflateInit">deflateInit</a>. sourceLen is the byte
|
||||||
|
length of the source buffer. Upon entry, destLen is the total size of the
|
||||||
|
destination buffer, which must be at least 0.1% larger than sourceLen plus
|
||||||
|
12 bytes. Upon exit, destLen is the actual size of the compressed buffer.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<a href="#compress2">compress2</a> returns <a href="#Z_OK">Z_OK</a> if success, <a href="#Z_MEM_ERROR">Z_MEM_ERROR</a> if there was not enough
|
||||||
|
memory, <a href="#Z_BUF_ERROR">Z_BUF_ERROR</a> if there was not enough room in the output buffer,
|
||||||
|
<a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if the level parameter is invalid.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> int <a name="uncompress">uncompress</a> (Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen);</font>
|
||||||
|
<dd>
|
||||||
|
Decompresses the source buffer into the destination buffer. sourceLen is
|
||||||
|
the byte length of the source buffer. Upon entry, destLen is the total
|
||||||
|
size of the destination buffer, which must be large enough to hold the
|
||||||
|
entire uncompressed data. (The size of the uncompressed data must have
|
||||||
|
been saved previously by the compressor and transmitted to the decompressor
|
||||||
|
by some mechanism outside the scope of this compression library.)
|
||||||
|
Upon exit, destLen is the actual size of the compressed buffer. <p>
|
||||||
|
This function can be used to decompress a whole file at once if the
|
||||||
|
input file is mmap'ed.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<a href="#uncompress">uncompress</a> returns <a href="#Z_OK">Z_OK</a> if success, <a href="#Z_MEM_ERROR">Z_MEM_ERROR</a> if there was not
|
||||||
|
enough memory, <a href="#Z_BUF_ERROR">Z_BUF_ERROR</a> if there was not enough room in the output
|
||||||
|
buffer, or <a href="#Z_DATA_ERROR">Z_DATA_ERROR</a> if the input data was corrupted.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<dt> typedef voidp gzFile;
|
||||||
|
<dd> <p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> gzFile <a name="gzopen">gzopen</a> (const char *path, const char *mode);</font>
|
||||||
|
<dd>
|
||||||
|
Opens a gzip (.gz) file for reading or writing. The mode parameter
|
||||||
|
is as in fopen ("rb" or "wb") but can also include a compression level
|
||||||
|
("wb9") or a strategy: 'f' for filtered data as in "wb6f", 'h' for
|
||||||
|
Huffman only compression as in "wb1h". (See the description
|
||||||
|
of <a href="#deflateInit2">deflateInit2</a> for more information about the strategy parameter.)
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<a href="#gzopen">gzopen</a> can be used to read a file which is not in gzip format ; in this
|
||||||
|
case <a href="#gzread">gzread</a> will directly read from the file without decompression.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<a href="#gzopen">gzopen</a> returns NULL if the file could not be opened or if there was
|
||||||
|
insufficient memory to allocate the (de)compression <a href="#state">state</a> ; errno
|
||||||
|
can be checked to distinguish the two cases (if errno is zero, the
|
||||||
|
zlib error is <a href="#Z_MEM_ERROR">Z_MEM_ERROR</a>).
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> gzFile <a name="gzdopen">gzdopen</a> (int fd, const char *mode);</font>
|
||||||
|
<dd>
|
||||||
|
<a href="#gzdopen">gzdopen</a>() associates a gzFile with the file descriptor fd. File
|
||||||
|
descriptors are obtained from calls like open, dup, creat, pipe or
|
||||||
|
fileno (in the file has been previously opened with fopen).
|
||||||
|
The mode parameter is as in <a href="#gzopen">gzopen</a>.
|
||||||
|
<p>
|
||||||
|
The next call of <a href="#gzclose">gzclose</a> on the returned gzFile will also close the
|
||||||
|
file descriptor fd, just like fclose(fdopen(fd), mode) closes the file
|
||||||
|
descriptor fd. If you want to keep fd open, use <a href="#gzdopen">gzdopen</a>(dup(fd), mode).
|
||||||
|
<p>
|
||||||
|
<a href="#gzdopen">gzdopen</a> returns NULL if there was insufficient memory to allocate
|
||||||
|
the (de)compression <a href="#state">state</a>.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> int <a name="gzsetparams">gzsetparams</a> (gzFile file, int level, int strategy);</font>
|
||||||
|
<dd>
|
||||||
|
Dynamically update the compression level or strategy. See the description
|
||||||
|
of <a href="#deflateInit2">deflateInit2</a> for the meaning of these parameters.
|
||||||
|
<p>
|
||||||
|
<a href="#gzsetparams">gzsetparams</a> returns <a href="#Z_OK">Z_OK</a> if success, or <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if the file was not
|
||||||
|
opened for writing.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> int <a name="gzread">gzread</a> (gzFile file, voidp buf, unsigned len);</font>
|
||||||
|
<dd>
|
||||||
|
Reads the given number of uncompressed bytes from the compressed file.
|
||||||
|
If the input file was not in gzip format, <a href="#gzread">gzread</a> copies the given number
|
||||||
|
of bytes into the buffer.
|
||||||
|
<p>
|
||||||
|
<a href="#gzread">gzread</a> returns the number of uncompressed bytes actually read (0 for
|
||||||
|
end of file, -1 for error).
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> int <a name="gzwrite">gzwrite</a> (gzFile file, const voidp buf, unsigned len);</font>
|
||||||
|
<dd>
|
||||||
|
Writes the given number of uncompressed bytes into the compressed file.
|
||||||
|
<a href="#gzwrite">gzwrite</a> returns the number of uncompressed bytes actually written
|
||||||
|
(0 in case of error).
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> int VA <a name="gzprintf">gzprintf</a> (gzFile file, const char *format, ...);</font>
|
||||||
|
<dd>
|
||||||
|
Converts, formats, and writes the args to the compressed file under
|
||||||
|
control of the format string, as in fprintf. <a href="#gzprintf">gzprintf</a> returns the number of
|
||||||
|
uncompressed bytes actually written (0 in case of error).
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> int <a name="gzputs">gzputs</a> (gzFile file, const char *s);</font>
|
||||||
|
<dd>
|
||||||
|
Writes the given null-terminated string to the compressed file, excluding
|
||||||
|
the terminating null character.
|
||||||
|
<p>
|
||||||
|
<a href="#gzputs">gzputs</a> returns the number of characters written, or -1 in case of error.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> char * <a name="gzgets">gzgets</a> (gzFile file, char *buf, int len);</font>
|
||||||
|
<dd>
|
||||||
|
Reads bytes from the compressed file until len-1 characters are read, or
|
||||||
|
a newline character is read and transferred to buf, or an end-of-file
|
||||||
|
condition is encountered. The string is then terminated with a null
|
||||||
|
character.
|
||||||
|
<p>
|
||||||
|
<a href="#gzgets">gzgets</a> returns buf, or <a href="#Z_NULL">Z_NULL</a> in case of error.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> int <a name="gzputc">gzputc</a> (gzFile file, int c);</font>
|
||||||
|
<dd>
|
||||||
|
Writes c, converted to an unsigned char, into the compressed file.
|
||||||
|
<a href="#gzputc">gzputc</a> returns the value that was written, or -1 in case of error.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> int <a name="gzgetc">gzgetc</a> (gzFile file);</font>
|
||||||
|
<dd>
|
||||||
|
Reads one byte from the compressed file. <a href="#gzgetc">gzgetc</a> returns this byte
|
||||||
|
or -1 in case of end of file or error.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> int <a name="gzflush">gzflush</a> (gzFile file, int flush);</font>
|
||||||
|
<dd>
|
||||||
|
Flushes all pending output into the compressed file. The parameter
|
||||||
|
flush is as in the <a href="#deflate">deflate</a>() function. The return value is the zlib
|
||||||
|
error number (see function <a href="#gzerror">gzerror</a> below). <a href="#gzflush">gzflush</a> returns <a href="#Z_OK">Z_OK</a> if
|
||||||
|
the flush parameter is <a href="#Z_FINISH">Z_FINISH</a> and all output could be flushed.
|
||||||
|
<p>
|
||||||
|
<a href="#gzflush">gzflush</a> should be called only when strictly necessary because it can
|
||||||
|
degrade compression.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> z_off_t <a name="gzseek">gzseek</a> (gzFile file, z_off_t offset, int whence);</font>
|
||||||
|
<dd>
|
||||||
|
Sets the starting position for the next <a href="#gzread">gzread</a> or <a href="#gzwrite">gzwrite</a> on the
|
||||||
|
given compressed file. The offset represents a number of bytes in the
|
||||||
|
uncompressed data stream. The whence parameter is defined as in lseek(2);
|
||||||
|
the value SEEK_END is not supported.
|
||||||
|
<p>
|
||||||
|
If the file is opened for reading, this function is emulated but can be
|
||||||
|
extremely slow. If the file is opened for writing, only forward seeks are
|
||||||
|
supported ; <a href="#gzseek">gzseek</a> then compresses a sequence of zeroes up to the new
|
||||||
|
starting position.
|
||||||
|
<p>
|
||||||
|
<a href="#gzseek">gzseek</a> returns the resulting offset location as measured in bytes from
|
||||||
|
the beginning of the uncompressed stream, or -1 in case of error, in
|
||||||
|
particular if the file is opened for writing and the new starting position
|
||||||
|
would be before the current position.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> int <a name="gzrewind">gzrewind</a> (gzFile file);</font>
|
||||||
|
<dd>
|
||||||
|
Rewinds the given file. This function is supported only for reading.
|
||||||
|
<p>
|
||||||
|
<a href="#gzrewind">gzrewind</a>(file) is equivalent to (int)<a href="#gzseek">gzseek</a>(file, 0L, SEEK_SET)
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> z_off_t <a name="gztell">gztell</a> (gzFile file);</font>
|
||||||
|
<dd>
|
||||||
|
Returns the starting position for the next <a href="#gzread">gzread</a> or <a href="#gzwrite">gzwrite</a> on the
|
||||||
|
given compressed file. This position represents a number of bytes in the
|
||||||
|
uncompressed data stream.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<a href="#gztell">gztell</a>(file) is equivalent to <a href="#gzseek">gzseek</a>(file, 0L, SEEK_CUR)
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> int <a name="gzeof">gzeof</a> (gzFile file);</font>
|
||||||
|
<dd>
|
||||||
|
Returns 1 when EOF has previously been detected reading the given
|
||||||
|
input stream, otherwise zero.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> int <a name="gzclose">gzclose</a> (gzFile file);</font>
|
||||||
|
<dd>
|
||||||
|
Flushes all pending output if necessary, closes the compressed file
|
||||||
|
and deallocates all the (de)compression <a href="#state">state</a>. The return value is the zlib
|
||||||
|
error number (see function <a href="#gzerror">gzerror</a> below).
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> const char * <a name="gzerror">gzerror</a> (gzFile file, int *errnum);</font>
|
||||||
|
<dd>
|
||||||
|
Returns the error message for the last error which occurred on the
|
||||||
|
given compressed file. errnum is set to zlib error number. If an
|
||||||
|
error occurred in the file system and not in the compression library,
|
||||||
|
errnum is set to <a href="#Z_ERRNO">Z_ERRNO</a> and the application may consult errno
|
||||||
|
to get the exact error code.
|
||||||
|
<p>
|
||||||
|
</dl>
|
||||||
|
<hr>
|
||||||
|
<a name="Basic functions"><h2> Basic functions </h2>
|
||||||
|
<h3> Function list </h3>
|
||||||
|
<ul>
|
||||||
|
<li> const char * <a href="#zlibVersion">zlibVersion</a> (void);
|
||||||
|
<li> int <a href="#deflateInit">deflateInit</a> (<a href="#z_streamp">z_streamp</a> strm, int level);
|
||||||
|
<li> int <a href="#deflate">deflate</a> (<a href="#z_streamp">z_streamp</a> strm, int flush);
|
||||||
|
<li> int <a href="#deflateEnd">deflateEnd</a> (<a href="#z_streamp">z_streamp</a> strm);
|
||||||
|
<li> int <a href="#inflateInit">inflateInit</a> (<a href="#z_streamp">z_streamp</a> strm);
|
||||||
|
<li> int <a href="#inflate">inflate</a> (<a href="#z_streamp">z_streamp</a> strm, int flush);
|
||||||
|
<li> int <a href="#inflateEnd">inflateEnd</a> (<a href="#z_streamp">z_streamp</a> strm);
|
||||||
|
</ul>
|
||||||
|
|
||||||
|
<h3> Function description </h3>
|
||||||
|
<dl>
|
||||||
|
<font color="Blue"><dt> const char * <a name="zlibVersion">zlibVersion</a> (void);</font>
|
||||||
|
<dd> The application can compare <a href="#zlibVersion">zlibVersion</a> and ZLIB_VERSION for consistency.
|
||||||
|
If the first character differs, the library code actually used is
|
||||||
|
not compatible with the zlib.h header file used by the application.
|
||||||
|
This check is automatically made by <a href="#deflateInit">deflateInit</a> and <a href="#inflateInit">inflateInit</a>.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> int <a name="deflateInit">deflateInit</a> (<a href="#z_streamp">z_streamp</a> strm, int level);</font>
|
||||||
|
<dd>
|
||||||
|
Initializes the internal stream <a href="#state">state</a> for compression. The fields
|
||||||
|
<a href="#zalloc">zalloc</a>, <a href="#zfree">zfree</a> and <a href="#opaque">opaque</a> must be initialized before by the caller.
|
||||||
|
If <a href="#zalloc">zalloc</a> and <a href="#zfree">zfree</a> are set to <a href="#Z_NULL">Z_NULL</a>, <a href="#deflateInit">deflateInit</a> updates them to
|
||||||
|
use default allocation functions.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
The compression level must be <a href="#Z_DEFAULT_COMPRESSION">Z_DEFAULT_COMPRESSION</a>, or between 0 and 9:
|
||||||
|
1 gives best speed, 9 gives best compression, 0 gives no compression at
|
||||||
|
all (the input data is simply copied a block at a time).
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<a href="#Z_DEFAULT_COMPRESSION">Z_DEFAULT_COMPRESSION</a> requests a default compromise between speed and
|
||||||
|
compression (currently equivalent to level 6).
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<a href="#deflateInit">deflateInit</a> returns <a href="#Z_OK">Z_OK</a> if success, <a href="#Z_MEM_ERROR">Z_MEM_ERROR</a> if there was not
|
||||||
|
enough memory, <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if level is not a valid compression level,
|
||||||
|
<a href="#Z_VERSION_ERROR">Z_VERSION_ERROR</a> if the zlib library version (<a href="#zlib_version">zlib_version</a>) is incompatible
|
||||||
|
with the version assumed by the caller (ZLIB_VERSION).
|
||||||
|
<a href="#msg">msg</a> is set to null if there is no error message. <a href="#deflateInit">deflateInit</a> does not
|
||||||
|
perform any compression: this will be done by <a href="#deflate">deflate</a>().
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> int <a name="deflate">deflate</a> (<a href="#z_streamp">z_streamp</a> strm, int flush);</font>
|
||||||
|
<dd>
|
||||||
|
<a href="#deflate">deflate</a> compresses as much data as possible, and stops when the input
|
||||||
|
buffer becomes empty or the output buffer becomes full. It may introduce some
|
||||||
|
output latency (reading input without producing any output) except when
|
||||||
|
forced to flush.<p>
|
||||||
|
|
||||||
|
The detailed semantics are as follows. <a href="#deflate">deflate</a> performs one or both of the
|
||||||
|
following actions:
|
||||||
|
|
||||||
|
<ul>
|
||||||
|
<li> Compress more input starting at <a href="#next_in">next_in</a> and update <a href="#next_in">next_in</a> and <a href="#avail_in">avail_in</a>
|
||||||
|
accordingly. If not all input can be processed (because there is not
|
||||||
|
enough room in the output buffer), <a href="#next_in">next_in</a> and <a href="#avail_in">avail_in</a> are updated and
|
||||||
|
processing will resume at this point for the next call of <a href="#deflate">deflate</a>().
|
||||||
|
|
||||||
|
<li>
|
||||||
|
Provide more output starting at <a href="#next_out">next_out</a> and update <a href="#next_out">next_out</a> and <a href="#avail_out">avail_out</a>
|
||||||
|
accordingly. This action is forced if the parameter flush is non zero.
|
||||||
|
Forcing flush frequently degrades the compression ratio, so this parameter
|
||||||
|
should be set only when necessary (in interactive applications).
|
||||||
|
Some output may be provided even if flush is not set.
|
||||||
|
</ul> <p>
|
||||||
|
|
||||||
|
Before the call of <a href="#deflate">deflate</a>(), the application should ensure that at least
|
||||||
|
one of the actions is possible, by providing more input and/or consuming
|
||||||
|
more output, and updating <a href="#avail_in">avail_in</a> or <a href="#avail_out">avail_out</a> accordingly ; <a href="#avail_out">avail_out</a>
|
||||||
|
should never be zero before the call. The application can consume the
|
||||||
|
compressed output when it wants, for example when the output buffer is full
|
||||||
|
(<a href="#avail_out">avail_out</a> == 0), or after each call of <a href="#deflate">deflate</a>(). If <a href="#deflate">deflate</a> returns <a href="#Z_OK">Z_OK</a>
|
||||||
|
and with zero <a href="#avail_out">avail_out</a>, it must be called again after making room in the
|
||||||
|
output buffer because there might be more output pending.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
If the parameter flush is set to <a href="#Z_SYNC_FLUSH">Z_SYNC_FLUSH</a>, all pending output is
|
||||||
|
flushed to the output buffer and the output is aligned on a byte boundary, so
|
||||||
|
that the decompressor can get all input data available so far. (In particular
|
||||||
|
<a href="#avail_in">avail_in</a> is zero after the call if enough output space has been provided
|
||||||
|
before the call.) Flushing may degrade compression for some compression
|
||||||
|
algorithms and so it should be used only when necessary.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
If flush is set to <a href="#Z_FULL_FLUSH">Z_FULL_FLUSH</a>, all output is flushed as with
|
||||||
|
<a href="#Z_SYNC_FLUSH">Z_SYNC_FLUSH</a>, and the compression <a href="#state">state</a> is reset so that decompression can
|
||||||
|
restart from this point if previous compressed data has been damaged or if
|
||||||
|
random access is desired. Using <a href="#Z_FULL_FLUSH">Z_FULL_FLUSH</a> too often can seriously degrade
|
||||||
|
the compression.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
If <a href="#deflate">deflate</a> returns with <a href="#avail_out">avail_out</a> == 0, this function must be called again
|
||||||
|
with the same value of the flush parameter and more output space (updated
|
||||||
|
<a href="#avail_out">avail_out</a>), until the flush is complete (<a href="#deflate">deflate</a> returns with non-zero
|
||||||
|
<a href="#avail_out">avail_out</a>).
|
||||||
|
<p>
|
||||||
|
|
||||||
|
If the parameter flush is set to <a href="#Z_FINISH">Z_FINISH</a>, pending input is processed,
|
||||||
|
pending output is flushed and <a href="#deflate">deflate</a> returns with <a href="#Z_STREAM_END">Z_STREAM_END</a> if there
|
||||||
|
was enough output space ; if <a href="#deflate">deflate</a> returns with <a href="#Z_OK">Z_OK</a>, this function must be
|
||||||
|
called again with <a href="#Z_FINISH">Z_FINISH</a> and more output space (updated <a href="#avail_out">avail_out</a>) but no
|
||||||
|
more input data, until it returns with <a href="#Z_STREAM_END">Z_STREAM_END</a> or an error. After
|
||||||
|
<a href="#deflate">deflate</a> has returned <a href="#Z_STREAM_END">Z_STREAM_END</a>, the only possible operations on the
|
||||||
|
stream are <a href="#deflateReset">deflateReset</a> or <a href="#deflateEnd">deflateEnd</a>.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<a href="#Z_FINISH">Z_FINISH</a> can be used immediately after <a href="#deflateInit">deflateInit</a> if all the compression
|
||||||
|
is to be done in a single step. In this case, <a href="#avail_out">avail_out</a> must be at least
|
||||||
|
0.1% larger than <a href="#avail_in">avail_in</a> plus 12 bytes. If <a href="#deflate">deflate</a> does not return
|
||||||
|
<a href="#Z_STREAM_END">Z_STREAM_END</a>, then it must be called again as described above.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<a href="#deflate">deflate</a>() sets strm-> <a href="#adler">adler</a> to the <a href="#adler32">adler32</a> checksum of all input read
|
||||||
|
so far (that is, <a href="#total_in">total_in</a> bytes).
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<a href="#deflate">deflate</a>() may update <a href="#data_type">data_type</a> if it can make a good guess about
|
||||||
|
the input data type (<a href="#Z_ASCII">Z_ASCII</a> or <a href="#Z_BINARY">Z_BINARY</a>). In doubt, the data is considered
|
||||||
|
binary. This field is only for information purposes and does not affect
|
||||||
|
the compression algorithm in any manner.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<a href="#deflate">deflate</a>() returns <a href="#Z_OK">Z_OK</a> if some progress has been made (more input
|
||||||
|
processed or more output produced), <a href="#Z_STREAM_END">Z_STREAM_END</a> if all input has been
|
||||||
|
consumed and all output has been produced (only when flush is set to
|
||||||
|
<a href="#Z_FINISH">Z_FINISH</a>), <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if the stream <a href="#state">state</a> was inconsistent (for example
|
||||||
|
if <a href="#next_in">next_in</a> or <a href="#next_out">next_out</a> was NULL), <a href="#Z_BUF_ERROR">Z_BUF_ERROR</a> if no progress is possible
|
||||||
|
(for example <a href="#avail_in">avail_in</a> or <a href="#avail_out">avail_out</a> was zero).
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> int <a name="deflateEnd">deflateEnd</a> (<a href="#z_streamp">z_streamp</a> strm);</font>
|
||||||
|
<dd>
|
||||||
|
All dynamically allocated data structures for this stream are freed.
|
||||||
|
This function discards any unprocessed input and does not flush any
|
||||||
|
pending output.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<a href="#deflateEnd">deflateEnd</a> returns <a href="#Z_OK">Z_OK</a> if success, <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if the
|
||||||
|
stream <a href="#state">state</a> was inconsistent, <a href="#Z_DATA_ERROR">Z_DATA_ERROR</a> if the stream was freed
|
||||||
|
prematurely (some input or output was discarded). In the error case,
|
||||||
|
<a href="#msg">msg</a> may be set but then points to a static string (which must not be
|
||||||
|
deallocated).
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> int <a name="inflateInit">inflateInit</a> (<a href="#z_streamp">z_streamp</a> strm);</font>
|
||||||
|
<dd>
|
||||||
|
Initializes the internal stream <a href="#state">state</a> for decompression. The fields
|
||||||
|
<a href="#next_in">next_in</a>, <a href="#avail_in">avail_in</a>, <a href="#zalloc">zalloc</a>, <a href="#zfree">zfree</a> and <a href="#opaque">opaque</a> must be initialized before by
|
||||||
|
the caller. If <a href="#next_in">next_in</a> is not <a href="#Z_NULL">Z_NULL</a> and <a href="#avail_in">avail_in</a> is large enough (the exact
|
||||||
|
value depends on the compression method), <a href="#inflateInit">inflateInit</a> determines the
|
||||||
|
compression method from the zlib header and allocates all data structures
|
||||||
|
accordingly ; otherwise the allocation will be deferred to the first call of
|
||||||
|
<a href="#inflate">inflate</a>. If <a href="#zalloc">zalloc</a> and <a href="#zfree">zfree</a> are set to <a href="#Z_NULL">Z_NULL</a>, <a href="#inflateInit">inflateInit</a> updates them to
|
||||||
|
use default allocation functions.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<a href="#inflateInit">inflateInit</a> returns <a href="#Z_OK">Z_OK</a> if success, <a href="#Z_MEM_ERROR">Z_MEM_ERROR</a> if there was not enough
|
||||||
|
memory, <a href="#Z_VERSION_ERROR">Z_VERSION_ERROR</a> if the zlib library version is incompatible with the
|
||||||
|
version assumed by the caller. <a href="#msg">msg</a> is set to null if there is no error
|
||||||
|
message. <a href="#inflateInit">inflateInit</a> does not perform any decompression apart from reading
|
||||||
|
the zlib header if present: this will be done by <a href="#inflate">inflate</a>(). (So <a href="#next_in">next_in</a> and
|
||||||
|
<a href="#avail_in">avail_in</a> may be modified, but <a href="#next_out">next_out</a> and <a href="#avail_out">avail_out</a> are unchanged.)
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> int <a name="inflate">inflate</a> (<a href="#z_streamp">z_streamp</a> strm, int flush);</font>
|
||||||
|
<dd>
|
||||||
|
<a href="#inflate">inflate</a> decompresses as much data as possible, and stops when the input
|
||||||
|
buffer becomes empty or the output buffer becomes full. It may some
|
||||||
|
introduce some output latency (reading input without producing any output)
|
||||||
|
except when forced to flush.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
The detailed semantics are as follows. <a href="#inflate">inflate</a> performs one or both of the
|
||||||
|
following actions:
|
||||||
|
|
||||||
|
<ul>
|
||||||
|
<li> Decompress more input starting at <a href="#next_in">next_in</a> and update <a href="#next_in">next_in</a> and <a href="#avail_in">avail_in</a>
|
||||||
|
accordingly. If not all input can be processed (because there is not
|
||||||
|
enough room in the output buffer), <a href="#next_in">next_in</a> is updated and processing
|
||||||
|
will resume at this point for the next call of <a href="#inflate">inflate</a>().
|
||||||
|
|
||||||
|
<li> Provide more output starting at <a href="#next_out">next_out</a> and update <a href="#next_out">next_out</a> and
|
||||||
|
<a href="#avail_out">avail_out</a> accordingly. <a href="#inflate">inflate</a>() provides as much output as possible,
|
||||||
|
until there is no more input data or no more space in the output buffer
|
||||||
|
(see below about the flush parameter).
|
||||||
|
</ul> <p>
|
||||||
|
|
||||||
|
Before the call of <a href="#inflate">inflate</a>(), the application should ensure that at least
|
||||||
|
one of the actions is possible, by providing more input and/or consuming
|
||||||
|
more output, and updating the next_* and avail_* values accordingly.
|
||||||
|
The application can consume the uncompressed output when it wants, for
|
||||||
|
example when the output buffer is full (<a href="#avail_out">avail_out</a> == 0), or after each
|
||||||
|
call of <a href="#inflate">inflate</a>(). If <a href="#inflate">inflate</a> returns <a href="#Z_OK">Z_OK</a> and with zero <a href="#avail_out">avail_out</a>, it
|
||||||
|
must be called again after making room in the output buffer because there
|
||||||
|
might be more output pending.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
If the parameter flush is set to <a href="#Z_SYNC_FLUSH">Z_SYNC_FLUSH</a>, <a href="#inflate">inflate</a> flushes as much
|
||||||
|
output as possible to the output buffer. The flushing behavior of <a href="#inflate">inflate</a> is
|
||||||
|
not specified for values of the flush parameter other than <a href="#Z_SYNC_FLUSH">Z_SYNC_FLUSH</a>
|
||||||
|
and <a href="#Z_FINISH">Z_FINISH</a>, but the current implementation actually flushes as much output
|
||||||
|
as possible anyway.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<a href="#inflate">inflate</a>() should normally be called until it returns <a href="#Z_STREAM_END">Z_STREAM_END</a> or an
|
||||||
|
error. However if all decompression is to be performed in a single step
|
||||||
|
(a single call of <a href="#inflate">inflate</a>), the parameter flush should be set to
|
||||||
|
<a href="#Z_FINISH">Z_FINISH</a>. In this case all pending input is processed and all pending
|
||||||
|
output is flushed ; <a href="#avail_out">avail_out</a> must be large enough to hold all the
|
||||||
|
uncompressed data. (The size of the uncompressed data may have been saved
|
||||||
|
by the compressor for this purpose.) The next operation on this stream must
|
||||||
|
be <a href="#inflateEnd">inflateEnd</a> to deallocate the decompression <a href="#state">state</a>. The use of <a href="#Z_FINISH">Z_FINISH</a>
|
||||||
|
is never required, but can be used to inform <a href="#inflate">inflate</a> that a faster routine
|
||||||
|
may be used for the single <a href="#inflate">inflate</a>() call.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
If a preset dictionary is needed at this point (see <a href="#inflateSetDictionary">inflateSetDictionary</a>
|
||||||
|
below), <a href="#inflate">inflate</a> sets strm-<a href="#adler">adler</a> to the <a href="#adler32">adler32</a> checksum of the
|
||||||
|
dictionary chosen by the compressor and returns <a href="#Z_NEED_DICT">Z_NEED_DICT</a> ; otherwise
|
||||||
|
it sets strm-> <a href="#adler">adler</a> to the <a href="#adler32">adler32</a> checksum of all output produced
|
||||||
|
so far (that is, <a href="#total_out">total_out</a> bytes) and returns <a href="#Z_OK">Z_OK</a>, <a href="#Z_STREAM_END">Z_STREAM_END</a> or
|
||||||
|
an error code as described below. At the end of the stream, <a href="#inflate">inflate</a>()
|
||||||
|
checks that its computed <a href="#adler32">adler32</a> checksum is equal to that saved by the
|
||||||
|
compressor and returns <a href="#Z_STREAM_END">Z_STREAM_END</a> only if the checksum is correct.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<a href="#inflate">inflate</a>() returns <a href="#Z_OK">Z_OK</a> if some progress has been made (more input processed
|
||||||
|
or more output produced), <a href="#Z_STREAM_END">Z_STREAM_END</a> if the end of the compressed data has
|
||||||
|
been reached and all uncompressed output has been produced, <a href="#Z_NEED_DICT">Z_NEED_DICT</a> if a
|
||||||
|
preset dictionary is needed at this point, <a href="#Z_DATA_ERROR">Z_DATA_ERROR</a> if the input data was
|
||||||
|
corrupted (input stream not conforming to the zlib format or incorrect
|
||||||
|
<a href="#adler32">adler32</a> checksum), <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if the stream structure was inconsistent
|
||||||
|
(for example if <a href="#next_in">next_in</a> or <a href="#next_out">next_out</a> was NULL), <a href="#Z_MEM_ERROR">Z_MEM_ERROR</a> if there was not
|
||||||
|
enough memory, <a href="#Z_BUF_ERROR">Z_BUF_ERROR</a> if no progress is possible or if there was not
|
||||||
|
enough room in the output buffer when <a href="#Z_FINISH">Z_FINISH</a> is used. In the <a href="#Z_DATA_ERROR">Z_DATA_ERROR</a>
|
||||||
|
case, the application may then call <a href="#inflateSync">inflateSync</a> to look for a good
|
||||||
|
compression block.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> int <a name="inflateEnd">inflateEnd</a> (<a href="#z_streamp">z_streamp</a> strm);</font>
|
||||||
|
<dd>
|
||||||
|
All dynamically allocated data structures for this stream are freed.
|
||||||
|
This function discards any unprocessed input and does not flush any
|
||||||
|
pending output.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<a href="#inflateEnd">inflateEnd</a> returns <a href="#Z_OK">Z_OK</a> if success, <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if the stream <a href="#state">state</a>
|
||||||
|
was inconsistent. In the error case, <a href="#msg">msg</a> may be set but then points to a
|
||||||
|
static string (which must not be deallocated).
|
||||||
|
</dl>
|
||||||
|
<hr>
|
||||||
|
<a name="Advanced functions"><h2> Advanced functions </h2>
|
||||||
|
The following functions are needed only in some special applications.
|
||||||
|
<h3> Function list </h3>
|
||||||
|
<ul>
|
||||||
|
<li> int <a href="#deflateInit2">deflateInit2</a> (<a href="#z_streamp">z_streamp</a> strm,
|
||||||
|
<li> int <a href="#deflateSetDictionary">deflateSetDictionary</a> (<a href="#z_streamp">z_streamp</a> strm, const Bytef *dictionary, uInt dictLength);
|
||||||
|
<li> int <a href="#deflateCopy">deflateCopy</a> (<a href="#z_streamp">z_streamp</a> dest, <a href="#z_streamp">z_streamp</a> source);
|
||||||
|
<li> int <a href="#deflateReset">deflateReset</a> (<a href="#z_streamp">z_streamp</a> strm);
|
||||||
|
<li> int <a href="#deflateParams">deflateParams</a> (<a href="#z_streamp">z_streamp</a> strm, int level, int strategy);
|
||||||
|
<li> int <a href="#inflateInit2">inflateInit2</a> (<a href="#z_streamp">z_streamp</a> strm, int windowBits);
|
||||||
|
<li> int <a href="#inflateSetDictionary">inflateSetDictionary</a> (<a href="#z_streamp">z_streamp</a> strm, const Bytef *dictionary, uInt dictLength);
|
||||||
|
<li> int <a href="#inflateSync">inflateSync</a> (<a href="#z_streamp">z_streamp</a> strm);
|
||||||
|
<li> int <a href="#inflateReset">inflateReset</a> (<a href="#z_streamp">z_streamp</a> strm);
|
||||||
|
|
||||||
|
</ul>
|
||||||
|
<h3> Function description </h3>
|
||||||
|
<dl>
|
||||||
|
<font color="Blue"><dt> int <a name="deflateInit2">deflateInit2</a> (<a href="#z_streamp">z_streamp</a> strm, int level, int method, int windowBits, int memLevel, int strategy);</font>
|
||||||
|
|
||||||
|
<dd> This is another version of <a href="#deflateInit">deflateInit</a> with more compression options. The
|
||||||
|
fields <a href="#next_in">next_in</a>, <a href="#zalloc">zalloc</a>, <a href="#zfree">zfree</a> and <a href="#opaque">opaque</a> must be initialized before by
|
||||||
|
the caller.<p>
|
||||||
|
|
||||||
|
The method parameter is the compression method. It must be <a href="#Z_DEFLATED">Z_DEFLATED</a> in
|
||||||
|
this version of the library.<p>
|
||||||
|
|
||||||
|
The windowBits parameter is the base two logarithm of the window size
|
||||||
|
(the size of the history buffer). It should be in the range 8..15 for this
|
||||||
|
version of the library. Larger values of this parameter result in better
|
||||||
|
compression at the expense of memory usage. The default value is 15 if
|
||||||
|
<a href="#deflateInit">deflateInit</a> is used instead.<p>
|
||||||
|
|
||||||
|
The memLevel parameter specifies how much memory should be allocated
|
||||||
|
for the internal compression <a href="#state">state</a>. memLevel=1 uses minimum memory but
|
||||||
|
is slow and reduces compression ratio ; memLevel=9 uses maximum memory
|
||||||
|
for optimal speed. The default value is 8. See zconf.h for total memory
|
||||||
|
usage as a function of windowBits and memLevel.<p>
|
||||||
|
|
||||||
|
The strategy parameter is used to tune the compression algorithm. Use the
|
||||||
|
value <a href="#Z_DEFAULT_STRATEGY">Z_DEFAULT_STRATEGY</a> for normal data, <a href="#Z_FILTERED">Z_FILTERED</a> for data produced by a
|
||||||
|
filter (or predictor), or <a href="#Z_HUFFMAN_ONLY">Z_HUFFMAN_ONLY</a> to force Huffman encoding only (no
|
||||||
|
string match). Filtered data consists mostly of small values with a
|
||||||
|
somewhat random distribution. In this case, the compression algorithm is
|
||||||
|
tuned to <a href="#compress">compress</a> them better. The effect of <a href="#Z_FILTERED">Z_FILTERED</a> is to force more
|
||||||
|
Huffman coding and less string matching ; it is somewhat intermediate
|
||||||
|
between Z_DEFAULT and <a href="#Z_HUFFMAN_ONLY">Z_HUFFMAN_ONLY</a>. The strategy parameter only affects
|
||||||
|
the compression ratio but not the correctness of the compressed output even
|
||||||
|
if it is not set appropriately.<p>
|
||||||
|
|
||||||
|
<a href="#deflateInit2">deflateInit2</a> returns <a href="#Z_OK">Z_OK</a> if success, <a href="#Z_MEM_ERROR">Z_MEM_ERROR</a> if there was not enough
|
||||||
|
memory, <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if a parameter is invalid (such as an invalid
|
||||||
|
method). <a href="#msg">msg</a> is set to null if there is no error message. <a href="#deflateInit2">deflateInit2</a> does
|
||||||
|
not perform any compression: this will be done by <a href="#deflate">deflate</a>().<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> int <a name="deflateSetDictionary">deflateSetDictionary</a> (<a href="#z_streamp">z_streamp</a> strm, const Bytef *dictionary, uInt dictLength);</font>
|
||||||
|
<dd>
|
||||||
|
Initializes the compression dictionary from the given byte sequence
|
||||||
|
without producing any compressed output. This function must be called
|
||||||
|
immediately after <a href="#deflateInit">deflateInit</a>, <a href="#deflateInit2">deflateInit2</a> or <a href="#deflateReset">deflateReset</a>, before any
|
||||||
|
call of <a href="#deflate">deflate</a>. The compressor and decompressor must use exactly the same
|
||||||
|
dictionary (see <a href="#inflateSetDictionary">inflateSetDictionary</a>).<p>
|
||||||
|
|
||||||
|
The dictionary should consist of strings (byte sequences) that are likely
|
||||||
|
to be encountered later in the data to be compressed, with the most commonly
|
||||||
|
used strings preferably put towards the end of the dictionary. Using a
|
||||||
|
dictionary is most useful when the data to be compressed is short and can be
|
||||||
|
predicted with good accuracy ; the data can then be compressed better than
|
||||||
|
with the default empty dictionary.<p>
|
||||||
|
|
||||||
|
Depending on the size of the compression data structures selected by
|
||||||
|
<a href="#deflateInit">deflateInit</a> or <a href="#deflateInit2">deflateInit2</a>, a part of the dictionary may in effect be
|
||||||
|
discarded, for example if the dictionary is larger than the window size in
|
||||||
|
<a href="#deflate">deflate</a> or deflate2. Thus the strings most likely to be useful should be
|
||||||
|
put at the end of the dictionary, not at the front.<p>
|
||||||
|
|
||||||
|
Upon return of this function, strm-> <a href="#adler">adler</a> is set to the Adler32 value
|
||||||
|
of the dictionary ; the decompressor may later use this value to determine
|
||||||
|
which dictionary has been used by the compressor. (The Adler32 value
|
||||||
|
applies to the whole dictionary even if only a subset of the dictionary is
|
||||||
|
actually used by the compressor.)<p>
|
||||||
|
|
||||||
|
<a href="#deflateSetDictionary">deflateSetDictionary</a> returns <a href="#Z_OK">Z_OK</a> if success, or <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if a
|
||||||
|
parameter is invalid (such as NULL dictionary) or the stream <a href="#state">state</a> is
|
||||||
|
inconsistent (for example if <a href="#deflate">deflate</a> has already been called for this stream
|
||||||
|
or if the compression method is bsort). <a href="#deflateSetDictionary">deflateSetDictionary</a> does not
|
||||||
|
perform any compression: this will be done by <a href="#deflate">deflate</a>().<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> int <a name="deflateCopy">deflateCopy</a> (<a href="#z_streamp">z_streamp</a> dest, <a href="#z_streamp">z_streamp</a> source);</font>
|
||||||
|
<dd>
|
||||||
|
Sets the destination stream as a complete copy of the source stream.<p>
|
||||||
|
|
||||||
|
This function can be useful when several compression strategies will be
|
||||||
|
tried, for example when there are several ways of pre-processing the input
|
||||||
|
data with a filter. The streams that will be discarded should then be freed
|
||||||
|
by calling <a href="#deflateEnd">deflateEnd</a>. Note that <a href="#deflateCopy">deflateCopy</a> duplicates the internal
|
||||||
|
compression <a href="#state">state</a> which can be quite large, so this strategy is slow and
|
||||||
|
can consume lots of memory.<p>
|
||||||
|
|
||||||
|
<a href="#deflateCopy">deflateCopy</a> returns <a href="#Z_OK">Z_OK</a> if success, <a href="#Z_MEM_ERROR">Z_MEM_ERROR</a> if there was not
|
||||||
|
enough memory, <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if the source stream <a href="#state">state</a> was inconsistent
|
||||||
|
(such as <a href="#zalloc">zalloc</a> being NULL). <a href="#msg">msg</a> is left unchanged in both source and
|
||||||
|
destination.<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> int <a name="deflateReset">deflateReset</a> (<a href="#z_streamp">z_streamp</a> strm);</font>
|
||||||
|
<dd> This function is equivalent to <a href="#deflateEnd">deflateEnd</a> followed by <a href="#deflateInit">deflateInit</a>,
|
||||||
|
but does not free and reallocate all the internal compression <a href="#state">state</a>.
|
||||||
|
The stream will keep the same compression level and any other attributes
|
||||||
|
that may have been set by <a href="#deflateInit2">deflateInit2</a>.<p>
|
||||||
|
|
||||||
|
<a href="#deflateReset">deflateReset</a> returns <a href="#Z_OK">Z_OK</a> if success, or <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if the source
|
||||||
|
stream <a href="#state">state</a> was inconsistent (such as <a href="#zalloc">zalloc</a> or <a href="#state">state</a> being NULL).<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> int <a name="deflateParams">deflateParams</a> (<a href="#z_streamp">z_streamp</a> strm, int level, int strategy);</font>
|
||||||
|
<dd>
|
||||||
|
Dynamically update the compression level and compression strategy. The
|
||||||
|
interpretation of level and strategy is as in <a href="#deflateInit2">deflateInit2</a>. This can be
|
||||||
|
used to switch between compression and straight copy of the input data, or
|
||||||
|
to switch to a different kind of input data requiring a different
|
||||||
|
strategy. If the compression level is changed, the input available so far
|
||||||
|
is compressed with the old level (and may be flushed); the new level will
|
||||||
|
take effect only at the next call of <a href="#deflate">deflate</a>().<p>
|
||||||
|
|
||||||
|
Before the call of <a href="#deflateParams">deflateParams</a>, the stream <a href="#state">state</a> must be set as for
|
||||||
|
a call of <a href="#deflate">deflate</a>(), since the currently available input may have to
|
||||||
|
be compressed and flushed. In particular, strm-> <a href="#avail_out">avail_out</a> must be
|
||||||
|
non-zero.<p>
|
||||||
|
|
||||||
|
<a href="#deflateParams">deflateParams</a> returns <a href="#Z_OK">Z_OK</a> if success, <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if the source
|
||||||
|
stream <a href="#state">state</a> was inconsistent or if a parameter was invalid, <a href="#Z_BUF_ERROR">Z_BUF_ERROR</a>
|
||||||
|
if strm->avail_out was zero.<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> int <a name="inflateInit2">inflateInit2</a> (<a href="#z_streamp">z_streamp</a> strm, int windowBits);</font>
|
||||||
|
|
||||||
|
<dd> This is another version of <a href="#inflateInit">inflateInit</a> with an extra parameter. The
|
||||||
|
fields <a href="#next_in">next_in</a>, <a href="#avail_in">avail_in</a>, <a href="#zalloc">zalloc</a>, <a href="#zfree">zfree</a> and <a href="#opaque">opaque</a> must be initialized
|
||||||
|
before by the caller.<p>
|
||||||
|
|
||||||
|
The windowBits parameter is the base two logarithm of the maximum window
|
||||||
|
size (the size of the history buffer). It should be in the range 8..15 for
|
||||||
|
this version of the library. The default value is 15 if <a href="#inflateInit">inflateInit</a> is used
|
||||||
|
instead. If a compressed stream with a larger window size is given as
|
||||||
|
input, <a href="#inflate">inflate</a>() will return with the error code <a href="#Z_DATA_ERROR">Z_DATA_ERROR</a> instead of
|
||||||
|
trying to allocate a larger window.<p>
|
||||||
|
|
||||||
|
<a href="#inflateInit2">inflateInit2</a> returns <a href="#Z_OK">Z_OK</a> if success, <a href="#Z_MEM_ERROR">Z_MEM_ERROR</a> if there was not enough
|
||||||
|
memory, <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if a parameter is invalid (such as a negative
|
||||||
|
memLevel). <a href="#msg">msg</a> is set to null if there is no error message. <a href="#inflateInit2">inflateInit2</a>
|
||||||
|
does not perform any decompression apart from reading the zlib header if
|
||||||
|
present: this will be done by <a href="#inflate">inflate</a>(). (So <a href="#next_in">next_in</a> and <a href="#avail_in">avail_in</a> may be
|
||||||
|
modified, but <a href="#next_out">next_out</a> and <a href="#avail_out">avail_out</a> are unchanged.)<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> int <a name="inflateSetDictionary">inflateSetDictionary</a> (<a href="#z_streamp">z_streamp</a> strm, const Bytef *dictionary, uInt dictLength);</font>
|
||||||
|
<dd>
|
||||||
|
Initializes the decompression dictionary from the given uncompressed byte
|
||||||
|
sequence. This function must be called immediately after a call of <a href="#inflate">inflate</a>
|
||||||
|
if this call returned <a href="#Z_NEED_DICT">Z_NEED_DICT</a>. The dictionary chosen by the compressor
|
||||||
|
can be determined from the Adler32 value returned by this call of
|
||||||
|
<a href="#inflate">inflate</a>. The compressor and decompressor must use exactly the same
|
||||||
|
dictionary (see <a href="#deflateSetDictionary">deflateSetDictionary</a>).<p>
|
||||||
|
|
||||||
|
<a href="#inflateSetDictionary">inflateSetDictionary</a> returns <a href="#Z_OK">Z_OK</a> if success, <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if a
|
||||||
|
parameter is invalid (such as NULL dictionary) or the stream <a href="#state">state</a> is
|
||||||
|
inconsistent, <a href="#Z_DATA_ERROR">Z_DATA_ERROR</a> if the given dictionary doesn't match the
|
||||||
|
expected one (incorrect Adler32 value). <a href="#inflateSetDictionary">inflateSetDictionary</a> does not
|
||||||
|
perform any decompression: this will be done by subsequent calls of
|
||||||
|
<a href="#inflate">inflate</a>().<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> int <a name="inflateSync">inflateSync</a> (<a href="#z_streamp">z_streamp</a> strm);</font>
|
||||||
|
|
||||||
|
<dd> Skips invalid compressed data until a full flush point (see above the
|
||||||
|
description of <a href="#deflate">deflate</a> with <a href="#Z_FULL_FLUSH">Z_FULL_FLUSH</a>) can be found, or until all
|
||||||
|
available input is skipped. No output is provided.<p>
|
||||||
|
|
||||||
|
<a href="#inflateSync">inflateSync</a> returns <a href="#Z_OK">Z_OK</a> if a full flush point has been found, <a href="#Z_BUF_ERROR">Z_BUF_ERROR</a>
|
||||||
|
if no more input was provided, <a href="#Z_DATA_ERROR">Z_DATA_ERROR</a> if no flush point has been found,
|
||||||
|
or <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if the stream structure was inconsistent. In the success
|
||||||
|
case, the application may save the current current value of <a href="#total_in">total_in</a> which
|
||||||
|
indicates where valid compressed data was found. In the error case, the
|
||||||
|
application may repeatedly call <a href="#inflateSync">inflateSync</a>, providing more input each time,
|
||||||
|
until success or end of the input data.<p>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> int <a name="inflateReset">inflateReset</a> (<a href="#z_streamp">z_streamp</a> strm);</font>
|
||||||
|
<dd>
|
||||||
|
This function is equivalent to <a href="#inflateEnd">inflateEnd</a> followed by <a href="#inflateInit">inflateInit</a>,
|
||||||
|
but does not free and reallocate all the internal decompression <a href="#state">state</a>.
|
||||||
|
The stream will keep attributes that may have been set by <a href="#inflateInit2">inflateInit2</a>.
|
||||||
|
<p>
|
||||||
|
|
||||||
|
<a href="#inflateReset">inflateReset</a> returns <a href="#Z_OK">Z_OK</a> if success, or <a href="#Z_STREAM_ERROR">Z_STREAM_ERROR</a> if the source
|
||||||
|
stream <a href="#state">state</a> was inconsistent (such as <a href="#zalloc">zalloc</a> or <a href="#state">state</a> being NULL).
|
||||||
|
<p>
|
||||||
|
</dl>
|
||||||
|
|
||||||
|
<hr>
|
||||||
|
<a name="Checksum functions"><h2> Checksum functions </h2>
|
||||||
|
These functions are not related to compression but are exported
|
||||||
|
anyway because they might be useful in applications using the
|
||||||
|
compression library.
|
||||||
|
<h3> Function list </h3>
|
||||||
|
<ul>
|
||||||
|
<li> uLong <a href="#adler32">adler32</a> (uLong <a href="#adler">adler</a>, const Bytef *buf, uInt len);
|
||||||
|
<li> uLong <a href="#crc32">crc32</a> (uLong crc, const Bytef *buf, uInt len);
|
||||||
|
</ul>
|
||||||
|
<h3> Function description </h3>
|
||||||
|
<dl>
|
||||||
|
<font color="Blue"><dt> uLong <a name="adler32">adler32</a> (uLong <a href="#adler">adler</a>, const Bytef *buf, uInt len);</font>
|
||||||
|
<dd>
|
||||||
|
Update a running Adler-32 checksum with the bytes buf[0..len-1] and
|
||||||
|
return the updated checksum. If buf is NULL, this function returns
|
||||||
|
the required initial value for the checksum.
|
||||||
|
<p>
|
||||||
|
An Adler-32 checksum is almost as reliable as a CRC32 but can be computed
|
||||||
|
much faster. Usage example:
|
||||||
|
<pre>
|
||||||
|
|
||||||
|
uLong <a href="#adler">adler</a> = <a href="#adler32">adler32</a>(0L, <a href="#Z_NULL">Z_NULL</a>, 0);
|
||||||
|
|
||||||
|
while (read_buffer(buffer, length) != EOF) {
|
||||||
|
<a href="#adler">adler</a> = <a href="#adler32">adler32</a>(<a href="#adler">adler</a>, buffer, length);
|
||||||
|
}
|
||||||
|
if (<a href="#adler">adler</a> != original_adler) error();
|
||||||
|
</pre>
|
||||||
|
|
||||||
|
<font color="Blue"><dt> uLong <a name="crc32">crc32</a> (uLong crc, const Bytef *buf, uInt len);</font>
|
||||||
|
<dd>
|
||||||
|
Update a running crc with the bytes buf[0..len-1] and return the updated
|
||||||
|
crc. If buf is NULL, this function returns the required initial value
|
||||||
|
for the crc. Pre- and post-conditioning (one's complement) is performed
|
||||||
|
within this function so it shouldn't be done by the application.
|
||||||
|
Usage example:
|
||||||
|
<pre>
|
||||||
|
|
||||||
|
uLong crc = <a href="#crc32">crc32</a>(0L, <a href="#Z_NULL">Z_NULL</a>, 0);
|
||||||
|
|
||||||
|
while (read_buffer(buffer, length) != EOF) {
|
||||||
|
crc = <a href="#crc32">crc32</a>(crc, buffer, length);
|
||||||
|
}
|
||||||
|
if (crc != original_crc) error();
|
||||||
|
</pre>
|
||||||
|
</dl>
|
||||||
|
<hr>
|
||||||
|
<a name="struct z_stream_s"><h2> struct z_stream_s </h2>
|
||||||
|
<font color="Blue">
|
||||||
|
<a name="z_stream_s">
|
||||||
|
<pre>
|
||||||
|
typedef struct z_stream_s {
|
||||||
|
Bytef *<a name="next_in">next_in</a>; /* next input byte */
|
||||||
|
uInt <a name="avail_in">avail_in</a>; /* number of bytes available at <a href="#next_in">next_in</a> */
|
||||||
|
uLong <a name="total_in">total_in</a>; /* total nb of input bytes read so far */
|
||||||
|
|
||||||
|
Bytef *<a name="next_out">next_out</a>; /* next output byte should be put there */
|
||||||
|
uInt <a name="avail_out">avail_out</a>; /* remaining free space at <a href="#next_out">next_out</a> */
|
||||||
|
uLong <a name="total_out">total_out</a>; /* total nb of bytes output so far */
|
||||||
|
|
||||||
|
char *<a name="msg">msg</a>; /* last error message, NULL if no error */
|
||||||
|
struct internal_state FAR *<a name="state">state</a>; /* not visible by applications */
|
||||||
|
|
||||||
|
alloc_func <a name="zalloc">zalloc</a>; /* used to allocate the internal <a href="#state">state</a> */
|
||||||
|
free_func <a name="zfree">zfree</a>; /* used to free the internal <a href="#state">state</a> */
|
||||||
|
voidpf <a name="opaque">opaque</a>; /* private data object passed to <a href="#zalloc">zalloc</a> and <a href="#zfree">zfree</a> */
|
||||||
|
|
||||||
|
int <a name="data_type">data_type</a>; /* best guess about the data type: ascii or binary */
|
||||||
|
uLong <a name="adler">adler</a>; /* <a href="#adler32">adler32</a> value of the uncompressed data */
|
||||||
|
uLong <a name="reserved">reserved</a>; /* <a href="#reserved">reserved</a> for future use */
|
||||||
|
} <a href="#z_stream_s">z_stream</a> ;
|
||||||
|
|
||||||
|
typedef <a href="#z_stream_s">z_stream</a> FAR * <a name="z_streamp">z_streamp</a>; ÿ
|
||||||
|
</pre>
|
||||||
|
</font>
|
||||||
|
The application must update <a href="#next_in">next_in</a> and <a href="#avail_in">avail_in</a> when <a href="#avail_in">avail_in</a> has
|
||||||
|
dropped to zero. It must update <a href="#next_out">next_out</a> and <a href="#avail_out">avail_out</a> when <a href="#avail_out">avail_out</a>
|
||||||
|
has dropped to zero. The application must initialize <a href="#zalloc">zalloc</a>, <a href="#zfree">zfree</a> and
|
||||||
|
<a href="#opaque">opaque</a> before calling the init function. All other fields are set by the
|
||||||
|
compression library and must not be updated by the application. <p>
|
||||||
|
|
||||||
|
The <a href="#opaque">opaque</a> value provided by the application will be passed as the first
|
||||||
|
parameter for calls of <a href="#zalloc">zalloc</a> and <a href="#zfree">zfree</a>. This can be useful for custom
|
||||||
|
memory management. The compression library attaches no meaning to the
|
||||||
|
<a href="#opaque">opaque</a> value. <p>
|
||||||
|
|
||||||
|
<a href="#zalloc">zalloc</a> must return <a href="#Z_NULL">Z_NULL</a> if there is not enough memory for the object.
|
||||||
|
If zlib is used in a multi-threaded application, <a href="#zalloc">zalloc</a> and <a href="#zfree">zfree</a> must be
|
||||||
|
thread safe. <p>
|
||||||
|
|
||||||
|
On 16-bit systems, the functions <a href="#zalloc">zalloc</a> and <a href="#zfree">zfree</a> must be able to allocate
|
||||||
|
exactly 65536 bytes, but will not be required to allocate more than this
|
||||||
|
if the symbol MAXSEG_64K is defined (see zconf.h). WARNING: On MSDOS,
|
||||||
|
pointers returned by <a href="#zalloc">zalloc</a> for objects of exactly 65536 bytes *must*
|
||||||
|
have their offset normalized to zero. The default allocation function
|
||||||
|
provided by this library ensures this (see zutil.c). To reduce memory
|
||||||
|
requirements and avoid any allocation of 64K objects, at the expense of
|
||||||
|
compression ratio, compile the library with -DMAX_WBITS=14 (see zconf.h).
|
||||||
|
<p>
|
||||||
|
|
||||||
|
The fields <a href="#total_in">total_in</a> and <a href="#total_out">total_out</a> can be used for statistics or
|
||||||
|
progress reports. After compression, <a href="#total_in">total_in</a> holds the total size of
|
||||||
|
the uncompressed data and may be saved for use in the decompressor
|
||||||
|
(particularly if the decompressor wants to decompress everything in
|
||||||
|
a single step). <p>
|
||||||
|
|
||||||
|
<hr>
|
||||||
|
<a name="Constants"><h2> Constants </h2>
|
||||||
|
<font color="Blue">
|
||||||
|
<pre>
|
||||||
|
#define <a name="Z_NO_FLUSH">Z_NO_FLUSH</a> 0
|
||||||
|
#define <a name="Z_PARTIAL_FLUSH">Z_PARTIAL_FLUSH</a> 1
|
||||||
|
/* will be removed, use <a href="#Z_SYNC_FLUSH">Z_SYNC_FLUSH</a> instead */
|
||||||
|
#define <a name="Z_SYNC_FLUSH">Z_SYNC_FLUSH</a> 2
|
||||||
|
#define <a name="Z_FULL_FLUSH">Z_FULL_FLUSH</a> 3
|
||||||
|
#define <a name="Z_FINISH">Z_FINISH</a> 4
|
||||||
|
/* Allowed flush values ; see <a href="#deflate">deflate</a>() below for details */
|
||||||
|
|
||||||
|
#define <a name="Z_OK">Z_OK</a> 0
|
||||||
|
#define <a name="Z_STREAM_END">Z_STREAM_END</a> 1
|
||||||
|
#define <a name="Z_NEED_DICT">Z_NEED_DICT</a> 2
|
||||||
|
#define <a name="Z_ERRNO">Z_ERRNO</a> (-1)
|
||||||
|
#define <a name="Z_STREAM_ERROR">Z_STREAM_ERROR</a> (-2)
|
||||||
|
#define <a name="Z_DATA_ERROR">Z_DATA_ERROR</a> (-3)
|
||||||
|
#define <a name="Z_MEM_ERROR">Z_MEM_ERROR</a> (-4)
|
||||||
|
#define <a name="Z_BUF_ERROR">Z_BUF_ERROR</a> (-5)
|
||||||
|
#define <a name="Z_VERSION_ERROR">Z_VERSION_ERROR</a> (-6)
|
||||||
|
/* Return codes for the compression/decompression functions. Negative
|
||||||
|
* values are errors, positive values are used for special but normal events.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#define <a name="Z_NO_COMPRESSION">Z_NO_COMPRESSION</a> 0
|
||||||
|
#define <a name="Z_BEST_SPEED">Z_BEST_SPEED</a> 1
|
||||||
|
#define <a name="Z_BEST_COMPRESSION">Z_BEST_COMPRESSION</a> 9
|
||||||
|
#define <a name="Z_DEFAULT_COMPRESSION">Z_DEFAULT_COMPRESSION</a> (-1)
|
||||||
|
/* compression levels */
|
||||||
|
|
||||||
|
#define <a name="Z_FILTERED">Z_FILTERED</a> 1
|
||||||
|
#define <a name="Z_HUFFMAN_ONLY">Z_HUFFMAN_ONLY</a> 2
|
||||||
|
#define <a name="Z_DEFAULT_STRATEGY">Z_DEFAULT_STRATEGY</a> 0
|
||||||
|
/* compression strategy ; see <a href="#deflateInit2">deflateInit2</a>() below for details */
|
||||||
|
|
||||||
|
#define <a name="Z_BINARY">Z_BINARY</a> 0
|
||||||
|
#define <a name="Z_ASCII">Z_ASCII</a> 1
|
||||||
|
#define <a name="Z_UNKNOWN">Z_UNKNOWN</a> 2
|
||||||
|
/* Possible values of the <a href="#data_type">data_type</a> field */
|
||||||
|
|
||||||
|
#define <a name="Z_DEFLATED">Z_DEFLATED</a> 8
|
||||||
|
/* The <a href="#deflate">deflate</a> compression method (the only one supported in this version) */
|
||||||
|
|
||||||
|
#define <a name="Z_NULL">Z_NULL</a> 0 /* for initializing <a href="#zalloc">zalloc</a>, <a href="#zfree">zfree</a>, <a href="#opaque">opaque</a> */
|
||||||
|
|
||||||
|
#define <a name="zlib_version">zlib_version</a> <a href="#zlibVersion">zlibVersion</a>()
|
||||||
|
/* for compatibility with versions less than 1.0.2 */
|
||||||
|
</pre>
|
||||||
|
</font>
|
||||||
|
|
||||||
|
<hr>
|
||||||
|
<a name="Misc"><h2> Misc </h2>
|
||||||
|
<a href="#deflateInit">deflateInit</a> and <a href="#inflateInit">inflateInit</a> are macros to allow checking the zlib version
|
||||||
|
and the compiler's view of <a href="#z_stream_s">z_stream</a>.
|
||||||
|
<p>
|
||||||
|
Other functions:
|
||||||
|
<dl>
|
||||||
|
<font color="Blue"><dt> const char * <a name="zError">zError</a> (int err);</font>
|
||||||
|
<font color="Blue"><dt> int <a name="inflateSyncPoint">inflateSyncPoint</a> (<a href="#z_streamp">z_streamp</a> z);</font>
|
||||||
|
<font color="Blue"><dt> const uLongf * <a name="get_crc_table">get_crc_table</a> (void);</font>
|
||||||
|
</dl>
|
||||||
|
<hr>
|
||||||
|
<font size="-1">
|
||||||
|
Last update: Wed Oct 13 20:42:34 1999<br>
|
||||||
|
piapi@csie.ntu.edu.tw
|
||||||
|
</font>
|
||||||
|
|
||||||
|
</body>
|
||||||
|
</html>
|
||||||
2
zutil.c
2
zutil.c
@ -1,5 +1,5 @@
|
|||||||
/* zutil.c -- target dependent utility functions for the compression library
|
/* zutil.c -- target dependent utility functions for the compression library
|
||||||
* Copyright (C) 1995-1998 Jean-loup Gailly.
|
* Copyright (C) 1995-2002 Jean-loup Gailly.
|
||||||
* For conditions of distribution and use, see copyright notice in zlib.h
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
||||||
*/
|
*/
|
||||||
|
|
||||||
|
|||||||
2
zutil.h
2
zutil.h
@ -1,5 +1,5 @@
|
|||||||
/* zutil.h -- internal interface and configuration of the compression library
|
/* zutil.h -- internal interface and configuration of the compression library
|
||||||
* Copyright (C) 1995-1998 Jean-loup Gailly.
|
* Copyright (C) 1995-2002 Jean-loup Gailly.
|
||||||
* For conditions of distribution and use, see copyright notice in zlib.h
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
||||||
*/
|
*/
|
||||||
|
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user