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d26bc48f0b
Fixes: a3ewdvDE2QSe Fixes: out of array read Out of array read Replicated through API with ASAN Found during triage of the review of https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24659 Found-by: Marton Balint <cus@passwd.hu>
91 lines
2.8 KiB
C
91 lines
2.8 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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* RealText subtitle decoder
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* @see http://service.real.com/help/library/guides/ProductionGuide/prodguide/htmfiles/realtext.htm
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*/
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#include "avcodec.h"
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#include "ass.h"
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#include "codec_internal.h"
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#include "decode.h"
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#include "libavutil/avstring.h"
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#include "libavutil/bprint.h"
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static int rt_event_to_ass(AVBPrint *buf, const char *p)
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{
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int prev_chr_is_space = 1;
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while (*p) {
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if (*p != '<') {
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if (!av_isspace(*p))
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av_bprint_chars(buf, *p, 1);
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else if (!prev_chr_is_space)
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av_bprint_chars(buf, ' ', 1);
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prev_chr_is_space = av_isspace(*p);
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} else {
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const char *end = strchr(p, '>');
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if (!end)
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break;
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if (!av_strncasecmp(p, "<br/>", 5) ||
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!av_strncasecmp(p, "<br>", 4)) {
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av_bprintf(buf, "\\N");
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}
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p = end;
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}
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p++;
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}
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return 0;
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}
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static int realtext_decode_frame(AVCodecContext *avctx, AVSubtitle *sub,
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int *got_sub_ptr, const AVPacket *avpkt)
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{
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int ret = 0;
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const char *ptr = ff_decode_subtitle_text(avctx, avpkt);
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FFASSDecoderContext *s = avctx->priv_data;
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AVBPrint buf;
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if (avpkt->size > 0 && !ptr)
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return AVERROR(ENOMEM);
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av_bprint_init(&buf, 0, 4096);
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if (ptr && avpkt->size > 0 && !rt_event_to_ass(&buf, ptr))
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ret = ff_ass_add_rect(sub, buf.str, s->readorder++, 0, NULL, NULL);
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av_bprint_finalize(&buf, NULL);
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if (ret < 0)
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return ret;
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*got_sub_ptr = sub->num_rects > 0;
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return avpkt->size;
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}
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const FFCodec ff_realtext_decoder = {
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.p.name = "realtext",
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CODEC_LONG_NAME("RealText subtitle"),
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.p.type = AVMEDIA_TYPE_SUBTITLE,
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.p.id = AV_CODEC_ID_REALTEXT,
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FF_CODEC_DECODE_SUB_CB(realtext_decode_frame),
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.init = ff_ass_subtitle_header_default,
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.flush = ff_ass_decoder_flush,
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.priv_data_size = sizeof(FFASSDecoderContext),
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};
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