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Error on compressed images with negative height. Also make uncompressed

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2005-01-04  Matthias Clasen  <mclasen@redhat.com>

	* io-bmp.c (DecodeHeader): Error on compressed images with
	negative height. Also make uncompressed images with data_offset
	!= header_size work.  (#150664, Owen Taylor)
This commit is contained in:
Matthias Clasen
2005-01-04 15:42:54 +00:00
committed by Matthias Clasen
parent 9b561cf218
commit c30892971b
2 changed files with 43 additions and 8 deletions
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6
gdk-pixbuf/ChangeLog
View File

@ -1,3 +1,9 @@
2005-01-04 Matthias Clasen <mclasen@redhat.com>
* io-bmp.c (DecodeHeader): Error on compressed images with
negative height. Also make uncompressed images with data_offset
!= header_size work. (#150664, Owen Taylor)
2005-01-02 Matthias Clasen <mclasen@redhat.com>
* pixops/pixops.c (bilinear_box_make_weights): Really fix the

45
gdk-pixbuf/io-bmp.c
View File

@ -33,6 +33,8 @@
#include "gdk-pixbuf-private.h"
#include "gdk-pixbuf-io.h"
#define DUMPBIH 1
#if 0
@ -295,16 +297,23 @@ static gboolean DecodeHeader(unsigned char *BFH, unsigned char *BIH,
State->Header.height = -State->Header.height;
State->Header.Negative = 1;
}
if (State->Header.width < 0) {
State->Header.width = -State->Header.width;
State->Header.Negative = 0;
if (State->Header.Negative &&
(State->Compressed != BI_RGB && State->Compressed != BI_BITFIELDS))
{
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
_("Topdown BMP images cannot be compressed"));
State->read_state = READ_STATE_ERROR;
return FALSE;
}
if (State->Header.width == 0 || State->Header.height == 0 ||
if (State->Header.width <= 0 || State->Header.height == 0 ||
(State->Compressed == BI_RLE4 && State->Type != 4) ||
(State->Compressed == BI_RLE8 && State->Type != 8) ||
(State->Compressed == BI_BITFIELDS && !(State->Type == 16 || State->Type == 32)) ||
State->Compressed > BI_BITFIELDS) {
(State->Compressed > BI_BITFIELDS)) {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
@ -388,13 +397,28 @@ static gboolean DecodeHeader(unsigned char *BFH, unsigned char *BIH,
}
}
g_print ("header size %d data offset %d compression %d\n",
14 + State->Header.size,
lsb_32 (&BFH[10]),
State->Compressed);
State->BufferDone = 0;
if (State->Type <= 8) {
State->read_state = READ_STATE_PALETTE;
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;
if (State->BufferSize < lsb_32 (&BFH[10]))
{
/* skip over padding between headers and image data */
State->read_state = READ_STATE_HEADERS;
State->BufferDone = State->BufferSize;
State->BufferSize = lsb_32 (&BFH[10]);
}
else
{
State->read_state = READ_STATE_DATA;
State->BufferSize = State->LineWidth;
}
} else if (State->Compressed == BI_BITFIELDS) {
State->read_state = READ_STATE_BITMASKS;
State->BufferSize = 12;
@ -844,6 +868,8 @@ static void OneLine(struct bmp_progressive_state *context)
context->Lines++;
if (context->updated_func != NULL) {
g_print ("OneLine negative %d lines %d\n",
context->Header.Negative, context->Lines);
(*context->updated_func) (context->pixbuf,
0,
(context->Header.Negative ?
@ -1008,12 +1034,15 @@ DoCompressed(struct bmp_progressive_state *context, GError **error)
}
if (context->updated_func != NULL) {
if (context->compr.y > y)
{
gint new_y = MIN (context->compr.y, context->Header.height);
(*context->updated_func) (context->pixbuf,
0,
y,
context->Header.width,
context->compr.y - y,
new_y - y,
context->user_data);
}
}