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Decode TIFF image only after all tags have been decoded

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Originally committed as revision 16268 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov 2008-12-22 06:50:18 +00:00
parent 8eedffde31
commit 108c96d5e7
1 changed files with 50 additions and 44 deletions
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94
libavcodec/tiff.c
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@ -41,8 +41,9 @@ typedef struct TiffContext {
int le;
int compr;
int invert;
int predictor;
int strips, rps;
int strips, rps, sstype;
int sot;
const uint8_t* stripdata;
const uint8_t* stripsizes;
@ -150,12 +151,10 @@ static int tiff_unpack_strip(TiffContext *s, uint8_t* dst, int stride, const uin
}
static int tiff_decode_tag(TiffContext *s, const uint8_t *start, const uint8_t *buf, const uint8_t *end_buf, AVFrame *pic)
static int tiff_decode_tag(TiffContext *s, const uint8_t *start, const uint8_t *buf, const uint8_t *end_buf)
{
int tag, type, count, off, value = 0;
const uint8_t *src;
uint8_t *dst;
int i, j, ssize, soff, stride;
int i, j;
uint32_t *pal;
const uint8_t *rp, *gp, *bp;
@ -261,6 +260,7 @@ static int tiff_decode_tag(TiffContext *s, const uint8_t *start, const uint8_t *
break;
case TIFF_COMPR:
s->compr = value;
s->predictor = 0;
switch(s->compr){
case TIFF_RAW:
case TIFF_PACKBITS:
@ -324,49 +324,14 @@ static int tiff_decode_tag(TiffContext *s, const uint8_t *start, const uint8_t *
s->stripsizes = start + off;
}
s->strips = count;
s->sstype = type;
if(s->stripsizes > end_buf){
av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
return -1;
}
if(!pic->data[0]){
av_log(s->avctx, AV_LOG_ERROR, "Picture initialization missing\n");
return -1;
}
/* now we have the data and may start decoding */
stride = pic->linesize[0];
dst = pic->data[0];
for(i = 0; i < s->height; i += s->rps){
if(s->stripsizes)
ssize = tget(&s->stripsizes, type, s->le);
else
ssize = s->stripsize;
if(s->stripdata){
soff = tget(&s->stripdata, s->sot, s->le);
}else
soff = s->stripoff;
src = start + soff;
if(tiff_unpack_strip(s, dst, stride, src, ssize, FFMIN(s->rps, s->height - i)) < 0)
break;
dst += s->rps * stride;
}
break;
case TIFF_PREDICTOR:
if(!pic->data[0]){
av_log(s->avctx, AV_LOG_ERROR, "Picture initialization missing\n");
return -1;
}
if(value == 2){
dst = pic->data[0];
stride = pic->linesize[0];
soff = s->bpp >> 3;
ssize = s->width * soff;
for(i = 0; i < s->height; i++) {
for(j = soff; j < ssize; j++)
dst[j] += dst[j - soff];
dst += stride;
}
}
s->predictor = value;
break;
case TIFF_INVERT:
switch(value){
@ -421,7 +386,9 @@ static int decode_frame(AVCodecContext *avctx,
AVFrame * const p= (AVFrame*)&s->picture;
const uint8_t *orig_buf = buf, *end_buf = buf + buf_size;
int id, le, off;
int i, entries;
int i, j, entries;
int stride, soff, ssize;
uint8_t *dst;
//parse image header
id = AV_RL16(buf); buf += 2;
@ -449,10 +416,49 @@ static int decode_frame(AVCodecContext *avctx,
buf = orig_buf + off;
entries = tget_short(&buf, le);
for(i = 0; i < entries; i++){
if(tiff_decode_tag(s, orig_buf, buf, end_buf, p) < 0)
if(tiff_decode_tag(s, orig_buf, buf, end_buf) < 0)
return -1;
buf += 12;
}
if(!s->stripdata && !s->stripoff){
av_log(avctx, AV_LOG_ERROR, "Image data is missing\n");
return -1;
}
/* now we have the data and may start decoding */
if(!p->data[0]){
av_log(s->avctx, AV_LOG_ERROR, "Picture initialization missing\n");
return -1;
}
if(s->strips == 1 && !s->stripsize){
av_log(avctx, AV_LOG_WARNING, "Image data size missing\n");
s->stripsize = buf_size - s->stripoff;
}
stride = p->linesize[0];
dst = p->data[0];
for(i = 0; i < s->height; i += s->rps){
if(s->stripsizes)
ssize = tget(&s->stripsizes, s->sstype, s->le);
else
ssize = s->stripsize;
if(s->stripdata){
soff = tget(&s->stripdata, s->sot, s->le);
}else
soff = s->stripoff;
if(tiff_unpack_strip(s, dst, stride, orig_buf + soff, ssize, FFMIN(s->rps, s->height - i)) < 0)
break;
dst += s->rps * stride;
}
if(s->predictor == 2){
dst = p->data[0];
soff = s->bpp >> 3;
ssize = s->width * soff;
for(i = 0; i < s->height; i++) {
for(j = soff; j < ssize; j++)
dst[j] += dst[j - soff];
dst += stride;
}
}
if(s->invert){
uint8_t *src;