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New functions to fetch 32 or 16-bit little-endian values starting at a

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2002-06-07  Federico Mena Quintero  <federico@ximian.com>

	* io-bmp.c (lsb_32):
	(lsb_16): New functions to fetch 32 or 16-bit little-endian values
	starting at a specific memory location.  We do this instead of
	GINT32_FROM_LE() as the latter is simply dereferences a cast,
	which doesn't work on platforms with alignment requirements.
	Fixes #84083.
This commit is contained in:
Federico Mena Quintero 2002-06-10 16:50:10 +00:00 committed by Federico Mena Quintero
parent 3d5f7b0cbf
commit ebeb676cf1
2 changed files with 37 additions and 11 deletions
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9
gdk-pixbuf/ChangeLog
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@ -1,3 +1,12 @@
2002-06-07 Federico Mena Quintero <federico@ximian.com>
* io-bmp.c (lsb_32):
(lsb_16): New functions to fetch 32 or 16-bit little-endian values
starting at a specific memory location. We do this instead of
GINT32_FROM_LE() as the latter is simply dereferences a cast,
which doesn't work on platforms with alignment requirements.
Fixes #84083.
2002-06-01 Matthias Clasen <maclas@gmx.de>
* gdk-pixbuf-io.c (pixbuf_check_xbm): Accept xbms starting

39
gdk-pixbuf/io-bmp.c
View File

@ -233,14 +233,31 @@ static GdkPixbuf *gdk_pixbuf__bmp_image_load(FILE * f, GError **error)
return pb;
}
/* Picks up a 32-bit little-endian integer starting at the specified location.
* Does it by hand instead of dereferencing a simple (gint *) cast due to
* alignment constraints many platforms.
*/
static int
lsb_32 (guchar *src)
{
return src[0] | (src[1] << 8) | (src[2] << 16) | (src[3] << 24);
}
/* Same as above, but for 16-bit little-endian integers. */
static short
lsb_16 (guchar *src)
{
return src[0] | (src[1] << 8);
}
static gboolean DecodeHeader(unsigned char *BFH, unsigned char *BIH,
struct bmp_progressive_state *State,
GError **error)
{
/* FIXME this is totally unrobust against bogus image data. */
if (State->BufferSize < GUINT32_FROM_LE (* (guint32 *) &BIH[0]) + 14) {
State->BufferSize = GUINT32_FROM_LE (* (guint32 *) &BIH[0]) + 14;
if (State->BufferSize < lsb_32 (&BIH[0]) + 14) {
State->BufferSize = lsb_32 (&BIH[0]) + 14;
State->buff = g_try_realloc (State->buff, State->BufferSize);
if (State->buff == NULL) {
g_set_error (error,
@ -257,16 +274,16 @@ static gboolean DecodeHeader(unsigned char *BFH, unsigned char *BIH,
DumpBIH(BIH);
#endif
State->Header.size = GUINT32_FROM_LE (* (guint32 *) &BIH[0]);
State->Header.size = lsb_32 (&BIH[0]);
if (State->Header.size == 40) {
State->Header.width = GINT32_FROM_LE (* (gint32 *) &BIH[4]);
State->Header.height = GINT32_FROM_LE (* (gint32 *) &BIH[8]);
State->Header.depth = GUINT16_FROM_LE (* (guint16 *) &BIH[14]);
State->Compressed = GUINT32_FROM_LE (* (guint32 *) &BIH[16]);
State->Header.width = lsb_32 (&BIH[4]);
State->Header.height = lsb_32 (&BIH[8]);
State->Header.depth = lsb_16 (&BIH[14]);
State->Compressed = lsb_32 (&BIH[16]);
} else if (State->Header.size == 12) {
State->Header.width = GUINT16_FROM_LE (* (guint16 *) &BIH[4]);
State->Header.height = GUINT16_FROM_LE (* (guint16 *) &BIH[6]);
State->Header.depth = GUINT16_FROM_LE (* (guint16 *) &BIH[10]);
State->Header.width = lsb_16 (&BIH[4]);
State->Header.height = lsb_16 (&BIH[6]);
State->Header.depth = lsb_16 (&BIH[10]);
State->Compressed = BI_RGB;
} else {
g_set_error (error,
@ -368,7 +385,7 @@ static gboolean DecodeHeader(unsigned char *BFH, unsigned char *BIH,
State->BufferDone = 0;
if (State->Type <= 8) {
State->read_state = READ_STATE_PALETTE;
State->BufferSize = GUINT32_FROM_LE (* (guint32 *) &BFH[10]) - 14 - State->Header.size;
State->BufferSize = lsb_32 (&BFH[10]) - 14 - State->Header.size;
} else if (State->Compressed == BI_RGB) {
State->read_state = READ_STATE_DATA;
State->BufferSize = State->LineWidth;