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gif: fix color table clipping (for cb5.gif)

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This commit is contained in:
cinap_lenrek 2015-03-11 12:59:19 +01:00
parent a6f7507661
commit a44a1dbd19
1 changed files with 4 additions and 8 deletions
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12
sys/src/cmd/jpg/readgif.c
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@ -376,7 +376,7 @@ static
uchar* uchar*
decode(Header *h, Rawimage *i, Entry *tbl) decode(Header *h, Rawimage *i, Entry *tbl)
{ {
int c, doclip, incode, codesize, CTM, EOD, pici, datai, stacki, nbits, sreg, fc, code, piclen; int c, incode, codesize, CTM, EOD, pici, datai, stacki, nbits, sreg, fc, code, piclen;
int csize, nentry, maxentry, first, ocode, ndata, nb; int csize, nentry, maxentry, first, ocode, ndata, nb;
uchar clip, *p, *pic; uchar clip, *p, *pic;
uchar stack[4096], data[256]; uchar stack[4096], data[256];
@ -386,10 +386,6 @@ decode(Header *h, Rawimage *i, Entry *tbl)
codesize = h->buf[0]; codesize = h->buf[0];
if(codesize>8 || 0>codesize) if(codesize>8 || 0>codesize)
giferror(h, "ReadGIF: can't handle codesize %d", codesize); giferror(h, "ReadGIF: can't handle codesize %d", codesize);
doclip = 0;
if(i->cmap!=nil && i->cmaplen!=3*(1<<codesize)
&& (codesize!=2 || i->cmaplen!=3*2)) /* peculiar GIF bitmap files... */
doclip = 1;
CTM =1<<codesize; CTM =1<<codesize;
EOD = CTM+1; EOD = CTM+1;
@ -490,10 +486,10 @@ decode(Header *h, Rawimage *i, Entry *tbl)
} }
Return: Return:
if(doclip){ if(i->cmap!=nil && i->cmaplen!=3*256){
clip = i->cmaplen/3; clip = (i->cmaplen/3)-1;
for(p = pic; p < pic+piclen; p++) for(p = pic; p < pic+piclen; p++)
if(*p >= clip) if(*p > clip)
*p = clip; *p = clip;
} }
h->pic = nil; h->pic = nil;