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handle partial reads. PR/29484.

This commit is contained in:
yamt 2005-02-22 21:45:44 +00:00
parent dcfd337d24
commit 751e975bfc
1 changed files with 53 additions and 15 deletions
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68
usr.bin/gzip/gzip.c
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@ -1,4 +1,4 @@
/* $NetBSD: gzip.c,v 1.70 2005/01/31 09:11:49 enami Exp $ */
/* $NetBSD: gzip.c,v 1.71 2005/02/22 21:45:44 yamt Exp $ */
/*
* Copyright (c) 1997, 1998, 2003, 2004 Matthew R. Green
@ -32,7 +32,7 @@
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1997, 1998, 2003, 2004 Matthew R. Green\n\
All rights reserved.\n");
__RCSID("$NetBSD: gzip.c,v 1.70 2005/01/31 09:11:49 enami Exp $");
__RCSID("$NetBSD: gzip.c,v 1.71 2005/02/22 21:45:44 yamt Exp $");
#endif /* not lint */
/*
@ -193,6 +193,7 @@ static void print_list(int fd, off_t, const char *, time_t);
static void usage(void);
static void display_version(void);
static const suffixes_t *check_suffix(char *, int);
static ssize_t read_retry(int, void *, size_t);
#ifdef SMALL
#define unlink_input(f, sb) unlink(f)
@ -687,6 +688,7 @@ gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep,
int error, done_reading = 0;
uLong crc;
ssize_t wr;
int needmore = 0;
#define ADVANCE() { z.next_in++; z.avail_in--; }
@ -712,8 +714,15 @@ gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep,
out_tot = 0;
for (;;) {
if (z.avail_in == 0 && done_reading == 0) {
size_t in_size = read(in, inbufp, BUFLEN);
if ((z.avail_in == 0 || needmore) && done_reading == 0) {
size_t in_size;
if (z.avail_in > 0) {
memmove(inbufp, z.next_in, z.avail_in);
}
z.next_in = inbufp;
in_size = read(in, z.next_in + z.avail_in,
BUFLEN - z.avail_in);
if (in_size == -1) {
#ifndef SMALL
@ -723,11 +732,12 @@ gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep,
maybe_warn("failed to read stdin");
out_tot = -1;
goto stop;
} else if (in_size == 0)
} else if (in_size == 0) {
done_reading = 1;
}
z.avail_in = in_size;
z.next_in = inbufp;
z.avail_in += in_size;
needmore = 0;
in_tot += in_size;
}
@ -891,17 +901,17 @@ gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep,
break;
case GZSTATE_CRC:
{
static int empty_buffer = 0;
uLong origcrc;
if (z.avail_in < 4) {
if (!done_reading && empty_buffer++ < 4)
if (!done_reading) {
needmore = 1;
continue;
}
maybe_warnx("truncated input");
out_tot = -1;
goto stop;
}
empty_buffer = 0;
origcrc = ((unsigned)z.next_in[0] & 0xff) |
((unsigned)z.next_in[1] & 0xff) << 8 |
((unsigned)z.next_in[2] & 0xff) << 16 |
@ -917,23 +927,24 @@ gz_uncompress(int in, int out, char *pre, size_t prelen, off_t *gsizep,
z.avail_in -= 4;
z.next_in += 4;
if (!z.avail_in)
if (!z.avail_in && done_reading) {
goto stop;
}
state++;
break;
case GZSTATE_LEN:
{
static int empty_buffer = 0;
uLong origlen;
if (z.avail_in < 4) {
if (!done_reading && empty_buffer++ < 4)
if (!done_reading) {
needmore = 1;
continue;
}
maybe_warnx("truncated input");
out_tot = -1;
goto stop;
}
empty_buffer = 0;
origlen = ((unsigned)z.next_in[0] & 0xff) |
((unsigned)z.next_in[1] & 0xff) << 8 |
((unsigned)z.next_in[2] & 0xff) << 16 |
@ -1501,6 +1512,7 @@ handle_stdin(void)
unsigned char header1[4];
off_t usize, gsize;
enum filetype method;
ssize_t bytes_read;
#ifndef NO_COMPRESS_SUPPORT
FILE *in;
#endif
@ -1524,9 +1536,13 @@ handle_stdin(void)
return;
}
if (read(STDIN_FILENO, header1, sizeof header1) != sizeof header1) {
bytes_read = read_retry(STDIN_FILENO, header1, sizeof header1);
if (bytes_read == -1) {
maybe_warn("can't read stdin");
return;
} else if (bytes_read != sizeof(header1)) {
maybe_warnx("unexpected EOF");
return;
}
method = file_gettype(header1);
@ -1919,3 +1935,25 @@ display_version(void)
#ifndef NO_COMPRESS_SUPPORT
#include "zuncompress.c"
#endif
static ssize_t
read_retry(int fd, void *buf, size_t sz)
{
char *cp = buf;
ssize_t left = sz;
while (left > 0) {
ssize_t ret;
ret = read(fd, cp, sz);
if (ret == -1) {
return ret;
} else if (ret == 0) {
break; /* EOF */
}
cp += ret;
left -= ret;
}
return sz - left;
}