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fix stbi__parse_png_file() reading too much bytes (thanks @miniupnp!) 

just "rewind" the bytes that have been read past the IEND chunk.
This commit is contained in:
Sam Lantinga 2025-02-24 17:28:48 -08:00
parent db4e6c1931
commit e6a24fcbb5
1 changed files with 4 additions and 0 deletions
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4
src/video/stb_image.h
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@ -5465,6 +5465,10 @@ static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp, unsigned i
STBI_FREE(z->expanded); z->expanded = NULL; STBI_FREE(z->expanded); z->expanded = NULL;
// end of PNG chunk, read and skip CRC // end of PNG chunk, read and skip CRC
stbi__get32be(s); stbi__get32be(s);
if (s->io.skip && s->img_buffer_end > s->img_buffer) {
// rewind the additional bytes that have been read to the buffer
(s->io.skip)(s->io_user_data, (int)(s->img_buffer - s->img_buffer_end));
}
return 1; return 1;
} }