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png: sysfatal, debug print to stderr instead of potentialy messing up output stream

front
cinap_lenrek 2012-07-17 08:51:20 +02:00
parent a78f5f8a3d
commit 5654f15e56
1 changed files with 3 additions and 4 deletions
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7
sys/src/cmd/jpg/readpng.c
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@ -175,6 +175,8 @@ unfilter(int alg, uchar *buf, uchar *up, int len, int bypp)
int i;
switch(alg){
default:
fprint(2, "unknown filtering scheme %d\n", alg);
case FilterNone:
break;
@ -201,9 +203,6 @@ unfilter(int alg, uchar *buf, uchar *up, int len, int bypp)
for(; i < len; ++i)
buf[i] += paeth(buf[i-bypp], up[i], up[i-bypp]);
break;
default:
sysfatal("unknown filtering scheme %d\n", alg);
}
}
@ -312,7 +311,7 @@ scanbytes(ZlibW *z)
else
n = (dx+adx-1)/adx;
if(n != 1 + (z->dx - (adam7[z->pass].x+1)) / adam7[z->pass].dx){
print("%d/%d != 1+(%d-1)/%d = %d\n",
fprint(2, "%d/%d != 1+(%d-1)/%d = %d\n",
z->dx - adam7[z->pass].x - 1 + adx, adx,
z->dx - (adam7[z->pass].x+1), adam7[z->pass].dx,
1 + (z->dx - (adam7[z->pass].x+1)) / adam7[z->pass].dx);