| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * MMS protocol common definitions. | ||
| 3 | * Copyright (c) 2006,2007 Ryan Martell | ||
| 4 | * Copyright (c) 2007 Björn Axelsson | ||
| 5 | * Copyright (c) 2010 Zhentan Feng <spyfeng at gmail dot com> | ||
| 6 | * | ||
| 7 | * This file is part of FFmpeg. | ||
| 8 | * | ||
| 9 | * FFmpeg is free software; you can redistribute it and/or | ||
| 10 | * modify it under the terms of the GNU Lesser General Public | ||
| 11 | * License as published by the Free Software Foundation; either | ||
| 12 | * version 2.1 of the License, or (at your option) any later version. | ||
| 13 | * | ||
| 14 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 17 | * Lesser General Public License for more details. | ||
| 18 | * | ||
| 19 | * You should have received a copy of the GNU Lesser General Public | ||
| 20 | * License along with FFmpeg; if not, write to the Free Software | ||
| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 22 | */ | ||
| 23 | #include "mms.h" | ||
| 24 | #include "asf.h" | ||
| 25 | #include "libavutil/intreadwrite.h" | ||
| 26 | |||
| 27 | #define MMS_MAX_STREAMS 256 /**< arbitrary sanity check value */ | ||
| 28 | |||
| 29 | ✗ | int ff_mms_read_header(MMSContext *mms, uint8_t *buf, const int size) | |
| 30 | { | ||
| 31 | char *pos; | ||
| 32 | int size_to_copy; | ||
| 33 | ✗ | int remaining_size = mms->asf_header_size - mms->asf_header_read_size; | |
| 34 | ✗ | size_to_copy = FFMIN(size, remaining_size); | |
| 35 | ✗ | pos = mms->asf_header + mms->asf_header_read_size; | |
| 36 | ✗ | memcpy(buf, pos, size_to_copy); | |
| 37 | ✗ | if (mms->asf_header_read_size == mms->asf_header_size) { | |
| 38 | ✗ | av_freep(&mms->asf_header); // which contains asf header | |
| 39 | } | ||
| 40 | ✗ | mms->asf_header_read_size += size_to_copy; | |
| 41 | ✗ | return size_to_copy; | |
| 42 | } | ||
| 43 | |||
| 44 | ✗ | int ff_mms_read_data(MMSContext *mms, uint8_t *buf, const int size) | |
| 45 | { | ||
| 46 | int read_size; | ||
| 47 | ✗ | read_size = FFMIN(size, mms->remaining_in_len); | |
| 48 | ✗ | memcpy(buf, mms->read_in_ptr, read_size); | |
| 49 | ✗ | mms->remaining_in_len -= read_size; | |
| 50 | ✗ | mms->read_in_ptr += read_size; | |
| 51 | ✗ | return read_size; | |
| 52 | } | ||
| 53 | |||
| 54 | ✗ | int ff_mms_asf_header_parser(MMSContext *mms) | |
| 55 | { | ||
| 56 | ✗ | uint8_t *p = mms->asf_header; | |
| 57 | uint8_t *end; | ||
| 58 | int flags, stream_id; | ||
| 59 | ✗ | mms->stream_num = 0; | |
| 60 | |||
| 61 | ✗ | if (mms->asf_header_size < sizeof(ff_asf_guid) * 2 + 22 || | |
| 62 | ✗ | memcmp(p, ff_asf_header, sizeof(ff_asf_guid))) { | |
| 63 | ✗ | av_log(mms->mms_hd, AV_LOG_ERROR, | |
| 64 | "Corrupt stream (invalid ASF header, size=%d)\n", | ||
| 65 | mms->asf_header_size); | ||
| 66 | ✗ | return AVERROR_INVALIDDATA; | |
| 67 | } | ||
| 68 | |||
| 69 | ✗ | end = mms->asf_header + mms->asf_header_size; | |
| 70 | |||
| 71 | ✗ | p += sizeof(ff_asf_guid) + 14; | |
| 72 | ✗ | while(end - p >= sizeof(ff_asf_guid) + 8) { | |
| 73 | uint64_t chunksize; | ||
| 74 | ✗ | if (!memcmp(p, ff_asf_data_header, sizeof(ff_asf_guid))) { | |
| 75 | ✗ | chunksize = 50; // see Reference [2] section 5.1 | |
| 76 | } else { | ||
| 77 | ✗ | chunksize = AV_RL64(p + sizeof(ff_asf_guid)); | |
| 78 | } | ||
| 79 | ✗ | if (!chunksize || chunksize > end - p) { | |
| 80 | ✗ | av_log(mms->mms_hd, AV_LOG_ERROR, | |
| 81 | "Corrupt stream (header chunksize %"PRId64" is invalid)\n", | ||
| 82 | chunksize); | ||
| 83 | ✗ | return AVERROR_INVALIDDATA; | |
| 84 | } | ||
| 85 | ✗ | if (!memcmp(p, ff_asf_file_header, sizeof(ff_asf_guid))) { | |
| 86 | /* read packet size */ | ||
| 87 | ✗ | if (end - p > sizeof(ff_asf_guid) * 2 + 68) { | |
| 88 | ✗ | mms->asf_packet_len = AV_RL32(p + sizeof(ff_asf_guid) * 2 + 64); | |
| 89 | ✗ | if (mms->asf_packet_len <= 0 || mms->asf_packet_len > sizeof(mms->in_buffer)) { | |
| 90 | ✗ | av_log(mms->mms_hd, AV_LOG_ERROR, | |
| 91 | "Corrupt stream (too large pkt_len %d)\n", | ||
| 92 | mms->asf_packet_len); | ||
| 93 | ✗ | return AVERROR_INVALIDDATA; | |
| 94 | } | ||
| 95 | } | ||
| 96 | ✗ | } else if (!memcmp(p, ff_asf_stream_header, sizeof(ff_asf_guid))) { | |
| 97 | ✗ | if (end - p >= (sizeof(ff_asf_guid) * 3 + 26)) { | |
| 98 | ✗ | flags = AV_RL16(p + sizeof(ff_asf_guid)*3 + 24); | |
| 99 | ✗ | stream_id = flags & 0x7F; | |
| 100 | //The second condition is for checking CS_PKT_STREAM_ID_REQUEST packet size, | ||
| 101 | //we can calculate the packet size by stream_num. | ||
| 102 | //Please see function send_stream_selection_request(). | ||
| 103 | ✗ | if (mms->stream_num < MMS_MAX_STREAMS && | |
| 104 | ✗ | 46 + mms->stream_num * 6 < sizeof(mms->out_buffer)) { | |
| 105 | ✗ | mms->streams = av_fast_realloc(mms->streams, | |
| 106 | &mms->nb_streams_allocated, | ||
| 107 | ✗ | (mms->stream_num + 1) * sizeof(MMSStream)); | |
| 108 | ✗ | if (!mms->streams) | |
| 109 | ✗ | return AVERROR(ENOMEM); | |
| 110 | ✗ | mms->streams[mms->stream_num].id = stream_id; | |
| 111 | ✗ | mms->stream_num++; | |
| 112 | } else { | ||
| 113 | ✗ | av_log(mms->mms_hd, AV_LOG_ERROR, | |
| 114 | "Corrupt stream (too many A/V streams)\n"); | ||
| 115 | ✗ | return AVERROR_INVALIDDATA; | |
| 116 | } | ||
| 117 | } | ||
| 118 | ✗ | } else if (!memcmp(p, ff_asf_ext_stream_header, sizeof(ff_asf_guid))) { | |
| 119 | ✗ | if (end - p >= 88) { | |
| 120 | ✗ | int stream_count = AV_RL16(p + 84), ext_len_count = AV_RL16(p + 86); | |
| 121 | ✗ | uint64_t skip_bytes = 88; | |
| 122 | ✗ | while (stream_count--) { | |
| 123 | ✗ | if (end - p < skip_bytes + 4) { | |
| 124 | ✗ | av_log(mms->mms_hd, AV_LOG_ERROR, | |
| 125 | "Corrupt stream (next stream name length is not in the buffer)\n"); | ||
| 126 | ✗ | return AVERROR_INVALIDDATA; | |
| 127 | } | ||
| 128 | ✗ | skip_bytes += 4 + AV_RL16(p + skip_bytes + 2); | |
| 129 | } | ||
| 130 | ✗ | while (ext_len_count--) { | |
| 131 | ✗ | if (end - p < skip_bytes + 22) { | |
| 132 | ✗ | av_log(mms->mms_hd, AV_LOG_ERROR, | |
| 133 | "Corrupt stream (next extension system info length is not in the buffer)\n"); | ||
| 134 | ✗ | return AVERROR_INVALIDDATA; | |
| 135 | } | ||
| 136 | ✗ | skip_bytes += 22 + AV_RL32(p + skip_bytes + 18); | |
| 137 | } | ||
| 138 | ✗ | if (end - p < skip_bytes) { | |
| 139 | ✗ | av_log(mms->mms_hd, AV_LOG_ERROR, | |
| 140 | "Corrupt stream (the last extension system info length is invalid)\n"); | ||
| 141 | ✗ | return AVERROR_INVALIDDATA; | |
| 142 | } | ||
| 143 | ✗ | if (chunksize - skip_bytes > 24) | |
| 144 | ✗ | chunksize = skip_bytes; | |
| 145 | } | ||
| 146 | ✗ | } else if (!memcmp(p, ff_asf_head1_guid, sizeof(ff_asf_guid))) { | |
| 147 | ✗ | chunksize = 46; // see references [2] section 3.4. This should be set 46. | |
| 148 | ✗ | if (chunksize > end - p) { | |
| 149 | ✗ | av_log(mms->mms_hd, AV_LOG_ERROR, | |
| 150 | "Corrupt stream (header chunksize %"PRId64" is invalid)\n", | ||
| 151 | chunksize); | ||
| 152 | ✗ | return AVERROR_INVALIDDATA; | |
| 153 | } | ||
| 154 | } | ||
| 155 | ✗ | p += chunksize; | |
| 156 | } | ||
| 157 | |||
| 158 | ✗ | return 0; | |
| 159 | } | ||
| 160 |