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FT_Open_Face: Improve external stream handling. 

If the font's `clazz->init_face' function wants to swap to new
stream, handling of whether original stream was external could
result to either memory leak or double free.  Mark externality into
face flags before calling `init_face' such that the clazz can handle
external streams properly.

* src/base/ftobjs.c (FT_Open_Face): Move code to set
FT_FACE_FLAG_EXTERNAL_STREAM to...
(open_face): This function.
This commit is contained in:
Behdad Esfahbod 2013-08-27 21:43:38 +02:00 committed by Werner Lemberg
parent bcd8c0b0eb
commit bd3849e7de
2 changed files with 22 additions and 6 deletions
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14
ChangeLog
View File

@ -1,3 +1,17 @@
2013-08-27 Behdad Esfahbod <behdad@google.com>
FT_Open_Face: Improve external stream handling.
If the font's `clazz->init_face' function wants to swap to new
stream, handling of whether original stream was external could
result to either memory leak or double free. Mark externality into
face flags before calling `init_face' such that the clazz can handle
external streams properly.
* src/base/ftobjs.c (FT_Open_Face): Move code to set
FT_FACE_FLAG_EXTERNAL_STREAM to...
(open_face): This function.
2013-08-27 Werner Lemberg <wl@gnu.org>
Remove `FT_SqrtFixed' function.

14
src/base/ftobjs.c
View File

@ -1134,6 +1134,7 @@
static FT_Error
open_face( FT_Driver driver,
FT_Stream stream,
FT_Bool external_stream,
FT_Long face_index,
FT_Int num_params,
FT_Parameter* params,
@ -1157,6 +1158,11 @@
face->memory = memory;
face->stream = stream;
/* set the FT_FACE_FLAG_EXTERNAL_STREAM bit for FT_Done_Face */
if ( external_stream )
face->face_flags |= FT_FACE_FLAG_EXTERNAL_STREAM;
if ( FT_NEW( internal ) )
goto Fail;
@ -2069,7 +2075,7 @@
params = args->params;
}
error = open_face( driver, stream, face_index,
error = open_face( driver, stream, external_stream, face_index,
num_params, params, &face );
if ( !error )
goto Success;
@ -2105,7 +2111,7 @@
params = args->params;
}
error = open_face( driver, stream, face_index,
error = open_face( driver, stream, external_stream, face_index,
num_params, params, &face );
if ( !error )
goto Success;
@ -2174,10 +2180,6 @@
Success:
FT_TRACE4(( "FT_Open_Face: New face object, adding to list\n" ));
/* set the FT_FACE_FLAG_EXTERNAL_STREAM bit for FT_Done_Face */
if ( external_stream )
face->face_flags |= FT_FACE_FLAG_EXTERNAL_STREAM;
/* add the face object to its driver's list */
if ( FT_NEW( node ) )
goto Fail;