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63 lines
2.3 KiB
63 lines
2.3 KiB
/* |
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* Copyright (C) 2007 Libav Project |
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* |
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* This file is part of Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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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#include "libavutil/intreadwrite.h" |
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#include "xiph.h" |
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int ff_split_xiph_headers(uint8_t *extradata, int extradata_size, |
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int first_header_size, uint8_t *header_start[3], |
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int header_len[3]) |
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{ |
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int i; |
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if (extradata_size >= 6 && AV_RB16(extradata) == first_header_size) { |
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int overall_len = 6; |
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for (i=0; i<3; i++) { |
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header_len[i] = AV_RB16(extradata); |
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extradata += 2; |
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header_start[i] = extradata; |
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extradata += header_len[i]; |
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if (overall_len > extradata_size - header_len[i]) |
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return -1; |
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overall_len += header_len[i]; |
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} |
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} else if (extradata_size >= 3 && extradata_size < INT_MAX - 0x1ff && extradata[0] == 2) { |
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int overall_len = 3; |
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extradata++; |
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for (i=0; i<2; i++, extradata++) { |
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header_len[i] = 0; |
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for (; overall_len < extradata_size && *extradata==0xff; extradata++) { |
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header_len[i] += 0xff; |
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overall_len += 0xff + 1; |
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} |
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header_len[i] += *extradata; |
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overall_len += *extradata; |
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if (overall_len > extradata_size) |
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return -1; |
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} |
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header_len[2] = extradata_size - overall_len; |
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header_start[0] = extradata; |
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header_start[1] = header_start[0] + header_len[0]; |
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header_start[2] = header_start[1] + header_len[1]; |
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} else { |
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return -1; |
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} |
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return 0; |
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}
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