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avcodec/faxcompr: Support uncompressed escapes in decode_group3_1d_line()

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Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-08-13 17:01:11 +02:00
parent dd1b4ed6d9
commit a4f9bb228b
1 changed files with 71 additions and 2 deletions
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73
libavcodec/faxcompr.c
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@ -149,8 +149,77 @@ static int decode_group3_1d_line(AVCodecContext *avctx, GetBitContext *gb,
run = 0;
mode = !mode;
} else if ((int)t == -1) {
av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");
return AVERROR_INVALIDDATA;
if (show_bits(gb, 12) == 15) {
int eob = 0;
int newmode;
int saved_run = 0;
skip_bits(gb, 12);
do {
int cwi, k;
int cw = 0;
int codes[2];
do {
cwi = show_bits(gb, 11);
if (!cwi) {
av_log(avctx, AV_LOG_ERROR, "Invalid uncompressed codeword\n");
return AVERROR_INVALIDDATA;
}
cwi = 10 - av_log2(cwi);
skip_bits(gb, cwi + 1);
if (cwi > 5) {
newmode = get_bits1(gb);
eob = 1;
cwi -= 6;
}
cw += cwi;
} while(cwi == 5);
codes[0] = cw;
codes[1] = !eob;
for (k = 0; k < 2; k++) {
if (codes[k]) {
if (mode == k) {
*runs++ = saved_run;
if (runs >= runend) {
av_log(avctx, AV_LOG_ERROR, "uncompressed run overrun\n");
return AVERROR_INVALIDDATA;
}
if (pix_left <= saved_run) {
av_log(avctx, AV_LOG_ERROR, "uncompressed run went out of bounds\n");
return AVERROR_INVALIDDATA;
}
pix_left -= saved_run;
saved_run = 0;
mode = !mode;
}
saved_run += codes[k];
}
}
} while (!eob);
*runs++ = saved_run;
if (runs >= runend) {
av_log(avctx, AV_LOG_ERROR, "uncompressed run overrun\n");
return AVERROR_INVALIDDATA;
}
if (pix_left <= saved_run) {
if (pix_left == saved_run)
break;
av_log(avctx, AV_LOG_ERROR, "uncompressed run went out of boundsE\n");
return AVERROR_INVALIDDATA;
}
pix_left -= saved_run;
saved_run = 0;
mode = !mode;
if (newmode != mode) { //FIXME CHECK
*runs++ = 0;
mode = newmode;
}
} else {
av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");
return AVERROR_INVALIDDATA;
}
}
}
*runs++ = 0;