| /* |
| * APE tag handling |
| * Copyright (c) 2007 Benjamin Zores <ben@geexbox.org> |
| * based upon libdemac from Dave Chapman. |
| * |
| * This file is part of FFmpeg. |
| * |
| * 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. |
| * |
| * 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 FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "libavutil/intreadwrite.h" |
| #include "libavutil/dict.h" |
| #include "avformat.h" |
| #include "apetag.h" |
| |
| #define APE_TAG_VERSION 2000 |
| #define APE_TAG_FOOTER_BYTES 32 |
| #define APE_TAG_FLAG_CONTAINS_HEADER (1 << 31) |
| #define APE_TAG_FLAG_IS_HEADER (1 << 29) |
| |
| static int ape_tag_read_field(AVFormatContext *s) |
| { |
| AVIOContext *pb = s->pb; |
| uint8_t key[1024], *value; |
| uint32_t size; |
| int i, c; |
| |
| size = avio_rl32(pb); /* field size */ |
| avio_skip(pb, 4); /* field flags */ |
| for (i = 0; i < sizeof(key) - 1; i++) { |
| c = avio_r8(pb); |
| if (c < 0x20 || c > 0x7E) |
| break; |
| else |
| key[i] = c; |
| } |
| key[i] = 0; |
| if (c != 0) { |
| av_log(s, AV_LOG_WARNING, "Invalid APE tag key '%s'.\n", key); |
| return -1; |
| } |
| if (size >= UINT_MAX) |
| return -1; |
| value = av_malloc(size+1); |
| if (!value) |
| return AVERROR(ENOMEM); |
| avio_read(pb, value, size); |
| value[size] = 0; |
| av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL); |
| return 0; |
| } |
| |
| void ff_ape_parse_tag(AVFormatContext *s) |
| { |
| AVIOContext *pb = s->pb; |
| int file_size = avio_size(pb); |
| uint32_t val, fields, tag_bytes; |
| uint8_t buf[8]; |
| int i; |
| |
| if (file_size < APE_TAG_FOOTER_BYTES) |
| return; |
| |
| avio_seek(pb, file_size - APE_TAG_FOOTER_BYTES, SEEK_SET); |
| |
| avio_read(pb, buf, 8); /* APETAGEX */ |
| if (strncmp(buf, "APETAGEX", 8)) { |
| return; |
| } |
| |
| val = avio_rl32(pb); /* APE tag version */ |
| if (val > APE_TAG_VERSION) { |
| av_log(s, AV_LOG_ERROR, "Unsupported tag version. (>=%d)\n", APE_TAG_VERSION); |
| return; |
| } |
| |
| tag_bytes = avio_rl32(pb); /* tag size */ |
| if (tag_bytes - APE_TAG_FOOTER_BYTES > (1024 * 1024 * 16)) { |
| av_log(s, AV_LOG_ERROR, "Tag size is way too big\n"); |
| return; |
| } |
| |
| fields = avio_rl32(pb); /* number of fields */ |
| if (fields > 65536) { |
| av_log(s, AV_LOG_ERROR, "Too many tag fields (%d)\n", fields); |
| return; |
| } |
| |
| val = avio_rl32(pb); /* flags */ |
| if (val & APE_TAG_FLAG_IS_HEADER) { |
| av_log(s, AV_LOG_ERROR, "APE Tag is a header\n"); |
| return; |
| } |
| |
| avio_seek(pb, file_size - tag_bytes, SEEK_SET); |
| |
| for (i=0; i<fields; i++) |
| if (ape_tag_read_field(s) < 0) break; |
| } |