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stb_image: fix gcc bounds-check warning (believed erroneous)

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Sean Barrett 2024-05-31 10:43:47 -07:00 committed by GitHub
parent 449758bd74
commit 013ac3bedd
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1 changed files with 6 additions and 3 deletions
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stb_image.h
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@ -1,4 +1,4 @@
/* stb_image - v2.29 - public domain image loader - http://nothings.org/stb
/* stb_image - v2.30 - public domain image loader - http://nothings.org/stb
no warranty implied; use at your own risk
Do this:
@ -48,6 +48,7 @@ LICENSE
RECENT REVISION HISTORY:
2.30 (2024-05-31) avoid erroneous gcc warning
2.29 (2023-05-xx) optimizations
2.28 (2023-01-29) many error fixes, security errors, just tons of stuff
2.27 (2021-07-11) document stbi_info better, 16-bit PNM support, bug fixes
@ -5159,9 +5160,11 @@ static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp)
// non-paletted with tRNS = constant alpha. if header-scanning, we can stop now.
if (scan == STBI__SCAN_header) { ++s->img_n; return 1; }
if (z->depth == 16) {
for (k = 0; k < s->img_n; ++k) tc16[k] = (stbi__uint16)stbi__get16be(s); // copy the values as-is
for (k = 0; k < s->img_n && k < 3; ++k) // extra loop test to suppress false GCC warning
tc16[k] = (stbi__uint16)stbi__get16be(s); // copy the values as-is
} else {
for (k = 0; k < s->img_n; ++k) tc[k] = (stbi_uc)(stbi__get16be(s) & 255) * stbi__depth_scale_table[z->depth]; // non 8-bit images will be larger
for (k = 0; k < s->img_n && k < 3; ++k)
tc[k] = (stbi_uc)(stbi__get16be(s) & 255) * stbi__depth_scale_table[z->depth]; // non 8-bit images will be larger
}
}
break;