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Check for too many MCU blocks in source image

This commit is contained in:
Philip Heron 2012-02-27 21:37:10 +00:00
parent 87c302a878
commit b1b314cdfc
1 changed files with 13 additions and 5 deletions
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18
ssdv.c
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@ -689,13 +689,21 @@ static char ssdv_have_marker_data(ssdv_t *s)
/* Calculate number of MCU blocks in this image */ /* Calculate number of MCU blocks in this image */
switch(s->mcu_mode) switch(s->mcu_mode)
{ {
case 0: s->mcu_count = (s->width >> 4) * (s->height >> 4); break; case 0: l = (s->width >> 4) * (s->height >> 4); break;
case 1: s->mcu_count = (s->width >> 4) * (s->height >> 3); break; case 1: l = (s->width >> 4) * (s->height >> 3); break;
case 2: s->mcu_count = (s->width >> 3) * (s->height >> 4); break; case 2: l = (s->width >> 3) * (s->height >> 4); break;
case 3: s->mcu_count = (s->width >> 3) * (s->height >> 3); break; case 3: l = (s->width >> 3) * (s->height >> 3); break;
} }
fprintf(stderr, "MCU blocks: %i\n", s->mcu_count); fprintf(stderr, "MCU blocks: %i\n", l);
if(l > 0xFFFF)
{
fprintf(stderr, "Error: Maximum number of MCU blocks is 65535\n");
return(SSDV_ERROR);
}
s->mcu_count = l;
break; break;