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wrlib: Improved file format detection

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- remove header not needed anymore
- revert change for XPM to stay in line with the standard
- changed PNG to stuck to the standard
- increased GIF to the complete signature

Signed-off-by: Christophe CURIS <christophe.curis@free.fr>
Signed-off-by: Carlos R. Mafra <crmafra@gmail.com>
This commit is contained in:
Christophe CURIS
2014-04-16 22:29:48 +02:00
committed by Carlos R. Mafra
parent 92b803bbdf
commit 8b73356c4f
1 changed files with 13 additions and 9 deletions
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22
wrlib/load.c
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@@ -33,10 +33,6 @@
#include <time.h>
#include <assert.h>
#ifdef USE_PNG
#include <png.h>
#endif
#include "wraster.h"
#include "imgformat.h"
@@ -281,7 +277,7 @@ char *RGetImageFileFormat(const char *file)
static WRImgFormat identFile(const char *path)
{
FILE *file;
unsigned char buffer[7];
unsigned char buffer[32];
size_t nread;
assert(path != NULL);
@@ -301,7 +297,7 @@ static WRImgFormat identFile(const char *path)
RETRY( fclose(file) )
/* check for XPM */
if (strncmp((char *)buffer, "/* XPM", 6) == 0)
if (strncmp((char *)buffer, "/* XPM */", 9) == 0)
return IM_XPM;
/* check for TIFF */
@@ -309,8 +305,15 @@ static WRImgFormat identFile(const char *path)
|| (buffer[0] == 'M' && buffer[1] == 'M' && buffer[2] == 0 && buffer[3] == '*'))
return IM_TIFF;
/* check for PNG */
if (buffer[0] == 0x89 && buffer[1] == 'P' && buffer[2] == 'N' && buffer[3] == 'G')
/*
* check for PNG
*
* The signature is defined in the PNG specifiation:
* http://www.libpng.org/pub/png/spec/1.2/PNG-Structure.html
* it is valid for v1.0, v1.1, v1.2 and ISO version
*/
if (buffer[0] == 137 && buffer[1] == 80 && buffer[2] == 78 && buffer[3] == 71 &&
buffer[4] == 13 && buffer[5] == 10 && buffer[6] == 26 && buffer[7] == 10)
return IM_PNG;
/* check for PBM or PGM or PPM */
@@ -322,7 +325,8 @@ static WRImgFormat identFile(const char *path)
return IM_JPEG;
/* check for GIF */
if (buffer[0] == 'G' && buffer[1] == 'I' && buffer[2] == 'F' && buffer[3] == '8')
if (buffer[0] == 'G' && buffer[1] == 'I' && buffer[2] == 'F' && buffer[3] == '8' &&
(buffer[4] == '7' || buffer[4] == '9') && buffer[5] == 'a')
return IM_GIF;
return IM_UNKNOWN;