mirror of
https://gitee.com/openharmony/third_party_ffmpeg
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1efaac6932
Fixes: signed integer overflow: -3 - 9223372036854775807 cannot be represented in type 'long' Fixes: 17828/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5645915116797952 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
141 lines
3.9 KiB
C
141 lines
3.9 KiB
C
/*
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* Copyright (c) 2012 Clément Bœsch
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* PJS (Phoenix Japanimation Society) subtitles format demuxer
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*
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* @see http://subs.com.ru/page.php?al=pjs
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*/
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#include "avformat.h"
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#include "internal.h"
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#include "subtitles.h"
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typedef struct {
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FFDemuxSubtitlesQueue q;
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} PJSContext;
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static int pjs_probe(const AVProbeData *p)
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{
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char c;
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int64_t start, end;
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const unsigned char *ptr = p->buf;
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if (sscanf(ptr, "%"SCNd64",%"SCNd64",%c", &start, &end, &c) == 3) {
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size_t q1pos = strcspn(ptr, "\"");
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size_t q2pos = q1pos + strcspn(ptr + q1pos + 1, "\"") + 1;
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if (strcspn(ptr, "\r\n") > q2pos)
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return AVPROBE_SCORE_MAX;
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}
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return 0;
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}
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static int64_t read_ts(char **line, int *duration)
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{
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int64_t start, end;
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if (sscanf(*line, "%"SCNd64",%"SCNd64, &start, &end) == 2) {
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*line += strcspn(*line, "\"");
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*line += !!**line;
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if (end < start || end - (uint64_t)start > INT_MAX)
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return AV_NOPTS_VALUE;
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*duration = end - start;
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return start;
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}
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return AV_NOPTS_VALUE;
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}
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static int pjs_read_header(AVFormatContext *s)
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{
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PJSContext *pjs = s->priv_data;
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AVStream *st = avformat_new_stream(s, NULL);
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int res = 0;
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if (!st)
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return AVERROR(ENOMEM);
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avpriv_set_pts_info(st, 64, 1, 10);
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st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
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st->codecpar->codec_id = AV_CODEC_ID_PJS;
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while (!avio_feof(s->pb)) {
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char line[4096];
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char *p = line;
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const int64_t pos = avio_tell(s->pb);
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int len = ff_get_line(s->pb, line, sizeof(line));
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int64_t pts_start;
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int duration;
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if (!len)
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break;
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line[strcspn(line, "\r\n")] = 0;
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pts_start = read_ts(&p, &duration);
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if (pts_start != AV_NOPTS_VALUE) {
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AVPacket *sub;
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p[strcspn(p, "\"")] = 0;
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sub = ff_subtitles_queue_insert(&pjs->q, p, strlen(p), 0);
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if (!sub)
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return AVERROR(ENOMEM);
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sub->pos = pos;
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sub->pts = pts_start;
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sub->duration = duration;
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}
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}
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ff_subtitles_queue_finalize(s, &pjs->q);
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return res;
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}
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static int pjs_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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PJSContext *pjs = s->priv_data;
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return ff_subtitles_queue_read_packet(&pjs->q, pkt);
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}
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static int pjs_read_seek(AVFormatContext *s, int stream_index,
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int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
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{
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PJSContext *pjs = s->priv_data;
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return ff_subtitles_queue_seek(&pjs->q, s, stream_index,
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min_ts, ts, max_ts, flags);
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}
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static int pjs_read_close(AVFormatContext *s)
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{
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PJSContext *pjs = s->priv_data;
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ff_subtitles_queue_clean(&pjs->q);
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return 0;
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}
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AVInputFormat ff_pjs_demuxer = {
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.name = "pjs",
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.long_name = NULL_IF_CONFIG_SMALL("PJS (Phoenix Japanimation Society) subtitles"),
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.priv_data_size = sizeof(PJSContext),
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.read_probe = pjs_probe,
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.read_header = pjs_read_header,
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.read_packet = pjs_read_packet,
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.read_seek2 = pjs_read_seek,
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.read_close = pjs_read_close,
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.extensions = "pjs",
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};
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