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avcodec/jpeglsdec: Return error codes from ls_decode_line()

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Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-09-19 18:51:29 +02:00
parent c552c3ef70
commit fe7fbf3a22
1 changed files with 18 additions and 8 deletions
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26
libavcodec/jpeglsdec.c
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@ -222,7 +222,7 @@ static inline int ls_get_code_runterm(GetBitContext *gb, JLSState *state,
/**
* Decode one line of image
*/
static inline void ls_decode_line(JLSState *state, MJpegDecodeContext *s,
static inline int ls_decode_line(JLSState *state, MJpegDecodeContext *s,
void *last, void *dst, int last2, int w,
int stride, int comp, int bits)
{
@ -234,7 +234,7 @@ static inline void ls_decode_line(JLSState *state, MJpegDecodeContext *s,
int err, pred;
if (get_bits_left(&s->gb) <= 0)
return;
return AVERROR_INVALIDDATA;
/* compute gradients */
Ra = x ? R(dst, x - stride) : R(last, x);
@ -263,11 +263,11 @@ static inline void ls_decode_line(JLSState *state, MJpegDecodeContext *s,
}
/* if EOL reached, we stop decoding */
if (r != 1 << ff_log2_run[state->run_index[comp]])
return;
return 0;
if (state->run_index[comp] < 31)
state->run_index[comp]++;
if (x + stride > w)
return;
return 0;
}
/* decode aborted run */
r = ff_log2_run[state->run_index[comp]];
@ -284,7 +284,7 @@ static inline void ls_decode_line(JLSState *state, MJpegDecodeContext *s,
if (x >= w) {
av_log(NULL, AV_LOG_ERROR, "run overflow\n");
av_assert0(x <= w);
return;
return AVERROR_INVALIDDATA;
}
/* decode run termination value */
@ -341,6 +341,8 @@ static inline void ls_decode_line(JLSState *state, MJpegDecodeContext *s,
W(dst, x, pred);
x += stride;
}
return 0;
}
int ff_jpegls_decode_picture(MJpegDecodeContext *s, int near,
@ -407,13 +409,16 @@ int ff_jpegls_decode_picture(MJpegDecodeContext *s, int near,
width = s->width * stride;
cur += off;
for (i = 0; i < s->height; i++) {
int ret;
if (s->bits <= 8) {
ls_decode_line(state, s, last, cur, t, width, stride, off, 8);
ret = ls_decode_line(state, s, last, cur, t, width, stride, off, 8);
t = last[0];
} else {
ls_decode_line(state, s, last, cur, t, width, stride, off, 16);
ret = ls_decode_line(state, s, last, cur, t, width, stride, off, 16);
t = *((uint16_t *)last);
}
if (ret < 0)
break;
last = cur;
cur += s->picture_ptr->linesize[0];
@ -429,9 +434,12 @@ int ff_jpegls_decode_picture(MJpegDecodeContext *s, int near,
memset(cur, 0, s->picture_ptr->linesize[0]);
width = s->width * stride;
for (i = 0; i < s->height; i++) {
int ret;
for (j = 0; j < stride; j++) {
ls_decode_line(state, s, last + j, cur + j,
ret = ls_decode_line(state, s, last + j, cur + j,
Rc[j], width, stride, j, 8);
if (ret < 0)
break;
Rc[j] = last[j];
if (s->restart_interval && !--s->restart_count) {
@ -439,6 +447,8 @@ int ff_jpegls_decode_picture(MJpegDecodeContext *s, int near,
skip_bits(&s->gb, 16); /* skip RSTn */
}
}
if (ret < 0)
break;
last = cur;
cur += s->picture_ptr->linesize[0];
}