diff options
Diffstat (limited to 'libavcodec/bmvvideo.c')
| -rw-r--r-- | libavcodec/bmvvideo.c | 27 |
1 files changed, 16 insertions, 11 deletions
diff --git a/libavcodec/bmvvideo.c b/libavcodec/bmvvideo.c index ebc8e7a082..76a3d6f1f6 100644 --- a/libavcodec/bmvvideo.c +++ b/libavcodec/bmvvideo.c @@ -2,23 +2,24 @@ * Discworld II BMV video decoder * Copyright (c) 2011 Konstantin Shishkov * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * - * Libav is distributed in the hope that it will be useful, + * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public - * License along with Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ +#include "libavutil/avassert.h" #include "libavutil/common.h" #include "avcodec.h" @@ -50,7 +51,7 @@ typedef struct BMVDecContext { const uint8_t *stream; } BMVDecContext; -#define NEXT_BYTE(v) v = forward ? v + 1 : v - 1; +#define NEXT_BYTE(v) (v) = forward ? (v) + 1 : (v) - 1; static int decode_bmv_frame(const uint8_t *source, int src_len, uint8_t *frame, int frame_off) { @@ -100,6 +101,8 @@ static int decode_bmv_frame(const uint8_t *source, int src_len, uint8_t *frame, } if (!(val & 0xC)) { for (;;) { + if(shift>22) + return -1; if (!read_two_nibbles) { if (src < source || src >= source_end) return AVERROR_INVALIDDATA; @@ -133,6 +136,7 @@ static int decode_bmv_frame(const uint8_t *source, int src_len, uint8_t *frame, } advance_mode = val & 1; len = (val >> 1) - 1; + av_assert0(len>0); mode += 1 + advance_mode; if (mode >= 4) mode -= 3; @@ -185,8 +189,6 @@ static int decode_bmv_frame(const uint8_t *source, int src_len, uint8_t *frame, memset(dst, val, len); } break; - default: - break; } if (dst == dst_end) return 0; @@ -227,7 +229,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, return AVERROR_INVALIDDATA; } for (i = 0; i < 256; i++) - c->pal[i] = bytestream_get_be24(&c->stream); + c->pal[i] = 0xFFU << 24 | bytestream_get_be24(&c->stream); } if (type & BMV_SCROLL) { if (c->stream - pkt->data > pkt->size - 2) { @@ -241,10 +243,8 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, scr_off = 0; } - if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) { - av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); + if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) return ret; - } if (decode_bmv_frame(c->stream, pkt->size - (c->stream - pkt->data), c->frame, scr_off)) { av_log(avctx, AV_LOG_ERROR, "Error decoding frame data\n"); @@ -276,6 +276,11 @@ static av_cold int decode_init(AVCodecContext *avctx) c->avctx = avctx; avctx->pix_fmt = AV_PIX_FMT_PAL8; + if (avctx->width != SCREEN_WIDE || avctx->height != SCREEN_HIGH) { + av_log(avctx, AV_LOG_ERROR, "Invalid dimension %dx%d\n", avctx->width, avctx->height); + return AVERROR_INVALIDDATA; + } + c->frame = c->frame_base + 640; return 0; |