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/*

 * APE tag handling

 * Copyright (c) 2007 Benjamin Zores 

 *  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 "avio_internal.h"

#include "apetag.h"

#include "internal.h"

#define APE_TAG_FLAG_CONTAINS_HEADER  (1 << 31)

#define APE_TAG_FLAG_CONTAINS_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;

    uint32_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 >= UINT_MAX)

        return -1;

    if (flags & APE_TAG_FLAG_IS_BINARY) {

        uint8_t filename[1024];

        enum AVCodecID id;

        AVStream *st = avformat_new_stream(s, NULL);

        if (!st)

            return AVERROR(ENOMEM);

        size -= avio_get_str(pb, size, filename, sizeof(filename));

        if (size <= 0) {

            av_log(s, AV_LOG_WARNING, "Skipping binary tag '%s'.\n", key);

            return 0;

        }

        av_dict_set(&st->metadata, key, filename, 0);

        if ((id = ff_guess_image2_codec(filename)) != AV_CODEC_ID_NONE) {

            AVPacket pkt;

            int ret;

            ret = av_get_packet(s->pb, &pkt, size);

            if (ret < 0) {

                av_log(s, AV_LOG_ERROR, "Error reading cover art.\n");

                return ret;

            }

            st->disposition      |= AV_DISPOSITION_ATTACHED_PIC;

            st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

            st->codec->codec_id   = id;

            st->attached_pic              = pkt;

            st->attached_pic.stream_index = st->index;

            st->attached_pic.flags       |= AV_PKT_FLAG_KEY;

        } else {

            if (ff_alloc_extradata(st->codec, size))

                return AVERROR(ENOMEM);

            if (avio_read(pb, st->codec->extradata, size) != size) {

                av_freep(&st->codec->extradata);

                st->codec->extradata_size = 0;

                return AVERROR(EIO);

            }

            st->codec->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 %u.\n", tag_bytes);

        return 0;

    }

    tag_start = file_size - tag_bytes - APE_TAG_FOOTER_BYTES;

    fields = avio_rl32(pb);    /* number of fields */

    if (fields > 65536) {

        av_log(s, AV_LOG_ERROR, "Too many tag fields (%d)\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);

    for (i=0; 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 = NULL;

    uint8_t *dyn_buf = NULL;

    if ((ret = avio_open_dyn_buf(&dyn_bc)) < 0)

        goto end;

    // flags

    avio_wl32(dyn_bc, APE_TAG_FLAG_CONTAINS_HEADER | APE_TAG_FLAG_CONTAINS_FOOTER |

                     APE_TAG_FLAG_IS_HEADER);

    ffio_fill(dyn_bc, 0, 8);             // reserved

    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_close_dyn_buf(dyn_bc, &dyn_buf);

    if (size <= 0)

        goto end;

    size += 20;

    // 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);

    avio_write(s->pb, dyn_buf, size - 20);

    // 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 | APE_TAG_FLAG_CONTAINS_FOOTER);

    ffio_fill(s->pb, 0, 8);             // reserved

end:

    if (dyn_bc && !dyn_buf)

        avio_close_dyn_buf(dyn_bc, &dyn_buf);

    av_freep(&dyn_buf);

    return ret;

}