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/*
* 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 <inttypes.h>
#include "libavutil/intreadwrite.h"
#include "libavutil/dict.h"
#include "avformat.h"
#include "avio_internal.h"
#include "apetag.h"
#include "internal.h"
#define APE_TAG_FLAG_CONTAINS_HEADER (1U << 31)
#define APE_TAG_FLAG_LACKS_FOOTER (1 << 30)
#define APE_TAG_FLAG_IS_HEADER (1 << 29)
#define APE_TAG_FLAG_IS_BINARY (1 << 1)
static int ape_tag_read_field(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
uint8_t key[1024], *value;
int64_t size, flags;
int i, c;
size = avio_rl32(pb); /* field size */
flags = avio_rl32(pb); /* 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 > INT32_MAX - AV_INPUT_BUFFER_PADDING_SIZE) {
av_log(s, AV_LOG_ERROR, "APE tag size too large.\n");
return AVERROR_INVALIDDATA;
}
if (flags & APE_TAG_FLAG_IS_BINARY) {
uint8_t filename[1024];
enum AVCodecID id;
int ret;
AVStream *st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
ret = avio_get_str(pb, size, filename, sizeof(filename));
if (ret < 0)
return ret;
if (size <= ret) {
av_log(s, AV_LOG_WARNING, "Skipping binary tag '%s'.\n", key);
return 0;
}
size -= ret;
av_dict_set(&st->metadata, key, filename, 0);
if ((id = ff_guess_image2_codec(filename)) != AV_CODEC_ID_NONE) {
int ret = ff_add_attached_pic(s, st, s->pb, NULL, size);
if (ret < 0) {
av_log(s, AV_LOG_ERROR, "Error reading cover art.\n");
return ret;
}
st->codecpar->codec_id = id;
} else {
if ((ret = ff_get_extradata(s, st->codecpar, s->pb, size)) < 0)
return ret;
st->codecpar->codec_type = AVMEDIA_TYPE_ATTACHMENT;
}
} else {
value = av_malloc(size+1);
if (!value)
return AVERROR(ENOMEM);
c = avio_read(pb, value, size);
if (c < 0) {
av_free(value);
return c;
}
value[c] = 0;
av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
}
return 0;
}
int64_t ff_ape_parse_tag(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
int64_t file_size = avio_size(pb);
uint32_t val, fields, tag_bytes;
uint8_t buf[8];
int64_t tag_start;
int i;
if (file_size < APE_TAG_FOOTER_BYTES)
return 0;
avio_seek(pb, file_size - APE_TAG_FOOTER_BYTES, SEEK_SET);
avio_read(pb, buf, 8); /* APETAGEX */
if (strncmp(buf, APE_TAG_PREAMBLE, 8)) {
return 0;
}
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 0;
}
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 0;
}
if (tag_bytes > file_size - APE_TAG_FOOTER_BYTES) {
av_log(s, AV_LOG_ERROR, "Invalid tag size %"PRIu32".\n", tag_bytes);
return 0;
}
fields = avio_rl32(pb); /* number of fields */
if (fields > 65536) {
av_log(s, AV_LOG_ERROR, "Too many tag fields (%"PRIu32")\n", fields);
return 0;
}
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 0;
}
avio_seek(pb, file_size - tag_bytes, SEEK_SET);
if (val & APE_TAG_FLAG_CONTAINS_HEADER)
tag_bytes += APE_TAG_HEADER_BYTES;
tag_start = file_size - tag_bytes;
for (i=0; i<fields; i++)
if (ape_tag_read_field(s) < 0) break;
return tag_start;
}
static int string_is_ascii(const uint8_t *str)
{
while (*str && *str >= 0x20 && *str <= 0x7e ) str++;
return !*str;
}
int ff_ape_write_tag(AVFormatContext *s)
{
AVDictionaryEntry *e = NULL;
int size, ret, count = 0;
AVIOContext *dyn_bc;
uint8_t *dyn_buf;
if ((ret = avio_open_dyn_buf(&dyn_bc)) < 0)
return ret;
ff_standardize_creation_time(s);
while ((e = av_dict_get(s->metadata, "", e, AV_DICT_IGNORE_SUFFIX))) {
int val_len;
if (!string_is_ascii(e->key)) {
av_log(s, AV_LOG_WARNING, "Non ASCII keys are not allowed\n");
continue;
}
val_len = strlen(e->value);
avio_wl32(dyn_bc, val_len); // value length
avio_wl32(dyn_bc, 0); // item flags
avio_put_str(dyn_bc, e->key); // key
avio_write(dyn_bc, e->value, val_len); // value
count++;
}
if (!count)
goto end;
size = avio_get_dyn_buf(dyn_bc, &dyn_buf);
if (size <= 0)
goto end;
size += APE_TAG_FOOTER_BYTES;
// header
avio_write(s->pb, "APETAGEX", 8); // id
avio_wl32(s->pb, APE_TAG_VERSION); // version
avio_wl32(s->pb, size);
avio_wl32(s->pb, count);
// flags
avio_wl32(s->pb, APE_TAG_FLAG_CONTAINS_HEADER | APE_TAG_FLAG_IS_HEADER);
ffio_fill(s->pb, 0, 8); // reserved
avio_write(s->pb, dyn_buf, size - APE_TAG_FOOTER_BYTES);
// footer
avio_write(s->pb, "APETAGEX", 8); // id
avio_wl32(s->pb, APE_TAG_VERSION); // version
avio_wl32(s->pb, size); // size
avio_wl32(s->pb, count); // tag count
// flags
avio_wl32(s->pb, APE_TAG_FLAG_CONTAINS_HEADER);
ffio_fill(s->pb, 0, 8); // reserved
end:
ffio_free_dyn_buf(&dyn_bc);
return ret;
}
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