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stb_image: Reorder format test sequence 

Put the formats that start with a clear magic number first,
the dodgy ones that don't have much of a distinctive header
should be tested for later after we've ruled out the clearer
ones.

Fixes issue #787, hopefully. (Never got a clean repro.)
This commit is contained in:
Fabian Giesen 2021-07-02 23:06:44 -07:00
parent 618dbd01c8
commit 56a7113cd0
1 changed files with 9 additions and 3 deletions
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12
stb_image.h
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@ -1117,9 +1117,8 @@ static void *stbi__load_main(stbi__context *s, int *x, int *y, int *comp, int re
ri->channel_order = STBI_ORDER_RGB; // all current input & output are this, but this is here so we can add BGR order
ri->num_channels = 0;
#ifndef STBI_NO_JPEG
if (stbi__jpeg_test(s)) return stbi__jpeg_load(s,x,y,comp,req_comp, ri);
#endif
// test the formats with a very explicit header first (at least a FOURCC
// or distinctive magic number first)
#ifndef STBI_NO_PNG
if (stbi__png_test(s)) return stbi__png_load(s,x,y,comp,req_comp, ri);
#endif
@ -1137,6 +1136,13 @@ static void *stbi__load_main(stbi__context *s, int *x, int *y, int *comp, int re
#ifndef STBI_NO_PIC
if (stbi__pic_test(s)) return stbi__pic_load(s,x,y,comp,req_comp, ri);
#endif
// then the formats that can end up attempting to load with just 1 or 2
// bytes matching expectations; these are prone to false positives, so
// try them later
#ifndef STBI_NO_JPEG
if (stbi__jpeg_test(s)) return stbi__jpeg_load(s,x,y,comp,req_comp, ri);
#endif
#ifndef STBI_NO_PNM
if (stbi__pnm_test(s)) return stbi__pnm_load(s,x,y,comp,req_comp, ri);
#endif