X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Ffaxcompr.c;h=80df418a2910c2601969fe5f3c6abafdc9480284;hb=9d1d7b367eeb74dbfb8501580e6c3568f3fe5973;hp=eb39ae0b20d487c31e0a01e5d227c2cb0e68a361;hpb=27e61a716c893a6ae67ca8f859c735bc0b0b799a;p=ffmpeg

diff --git a/libavcodec/faxcompr.c b/libavcodec/faxcompr.c
index eb39ae0b20d..80df418a291 100644
--- a/libavcodec/faxcompr.c
+++ b/libavcodec/faxcompr.c
@@ -122,6 +122,77 @@ av_cold void ff_ccitt_unpack_init(void)
     initialized = 1;
 }
 
+static int decode_uncompressed(AVCodecContext *avctx, GetBitContext *gb,
+                               unsigned int *pix_left, int **runs,
+                               const int *runend, int *mode)
+{
+    int eob = 0;
+    int newmode;
+    int saved_run = 0;
+
+    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)
+            return 1;
+        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;
+    }
+    return 0;
+}
 
 static int decode_group3_1d_line(AVCodecContext *avctx, GetBitContext *gb,
                                  unsigned int pix_left, int *runs,
@@ -149,8 +220,18 @@ 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 ret;
+                skip_bits(gb, 12);
+                ret = decode_uncompressed(avctx, gb, &pix_left, &runs, runend, &mode);
+                if (ret < 0) {
+                    return ret;
+                } else if (ret)
+                    break;
+            } else {
+                av_log(avctx, AV_LOG_ERROR, "Incorrect code\n");
+                return AVERROR_INVALIDDATA;
+            }
         }
     }
     *runs++ = 0;
@@ -211,8 +292,25 @@ static int decode_group3_2d_line(AVCodecContext *avctx, GetBitContext *gb,
                 mode = !mode;
             }
         } else if (cmode == 9 || cmode == 10) {
-            avpriv_report_missing_feature(avctx, "Special modes support");
-            return AVERROR_PATCHWELCOME;
+            int xxx = get_bits(gb, 3);
+            if (cmode == 9 && xxx == 7) {
+                int ret;
+                int pix_left = width - offs;
+
+                if (saved_run) {
+                    av_log(avctx, AV_LOG_ERROR, "saved run %d on entering uncompressed mode\n", saved_run);
+                    return AVERROR_INVALIDDATA;
+                }
+                ret = decode_uncompressed(avctx, gb, &pix_left, &runs, runend, &mode);
+                offs = width - pix_left;
+                if (ret < 0) {
+                    return ret;
+                } else if (ret)
+                    break;
+            } else {
+                avpriv_report_missing_feature(avctx, "Special mode %d xxx=%d support", cmode, xxx);
+                return AVERROR_PATCHWELCOME;
+            }
         } else { //vertical mode
             run      = run_off - offs + (cmode - 5);
             run_off -= *--ref;