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png: fail on invalid bpc

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This commit is contained in:
ftrvxmtrx 2014-12-14 22:20:06 +01:00
parent 67bed722f2
commit 0dc1929379
1 changed files with 10 additions and 0 deletions
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10
sys/src/cmd/jpg/readpng.c
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@ -420,30 +420,40 @@ readslave(Biobuf *b)
nout = 0;
switch(colorfmt){
case 0: /* grey */
if(bpc != 1 && bpc != 2 && bpc != 4 && bpc != 8 && bpc != 16)
sysfatal("invalid greyscale bpc %d", bpc);
image->nchans = 1;
image->chandesc = CY;
nout = 1;
nchan = 1;
break;
case 2: /* rgb */
if(bpc != 8 && bpc != 16)
sysfatal("invalid rgb bpc %d", bpc);
image->nchans = 1;
image->chandesc = CRGB24;
nout = 3;
nchan = 3;
break;
case 3: /* indexed rgb with PLTE */
if(bpc != 1 && bpc != 2 && bpc != 4 && bpc != 8)
sysfatal("invalid indexed rgb bpc %d", bpc);
image->nchans = 1;
image->chandesc = CRGB24;
nout = 3;
nchan = 1;
break;
case 4: /* grey+alpha */
if(bpc != 8 && bpc != 16)
sysfatal("invalid grey+alpha bpc %d", bpc);
image->nchans = 1;
image->chandesc = CYA16;
nout = 2;
nchan = 2;
break;
case 6: /* rgb+alpha */
if(bpc != 8 && bpc != 16)
sysfatal("invalid rgb+alpha bpc %d", bpc);
image->nchans = 1;
image->chandesc = CRGBA32;
nout = 4;