[deb_ffmpeg.git] / ffmpeg / libavformat / apetag.c

/*
 * 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  (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 > INT32_MAX - FF_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;
        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_get_extradata(st->codec, s->pb, size) < 0)
                return AVERROR(ENOMEM);
            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 %"PRIu32".\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 (%"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);

    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 = 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;
}
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* APE tag handling
	3	* Copyright (c) 2007 Benjamin Zores <ben@geexbox.org>
	4	* based upon libdemac from Dave Chapman.
	5	*
	6	* This file is part of FFmpeg.
	7	*
	8	* FFmpeg is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU Lesser General Public
	10	* License as published by the Free Software Foundation; either
	11	* version 2.1 of the License, or (at your option) any later version.
	12	*
	13	* FFmpeg is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	* Lesser General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU Lesser General Public
	19	* License along with FFmpeg; if not, write to the Free Software
	20	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	21	*/
	22
	23	#include <inttypes.h>
	24
	25	#include "libavutil/intreadwrite.h"
	26	#include "libavutil/dict.h"
	27	#include "avformat.h"
	28	#include "avio_internal.h"
	29	#include "apetag.h"
	30	#include "internal.h"
	31
	32	#define APE_TAG_FLAG_CONTAINS_HEADER (1 << 31)
	33	#define APE_TAG_FLAG_CONTAINS_FOOTER (1 << 30)
	34	#define APE_TAG_FLAG_IS_HEADER (1 << 29)
	35	#define APE_TAG_FLAG_IS_BINARY (1 << 1)
	36
	37	static int ape_tag_read_field(AVFormatContext *s)
	38	{
	39	AVIOContext *pb = s->pb;
	40	uint8_t key[1024], *value;
	41	uint32_t size, flags;
	42	int i, c;
	43
	44	size = avio_rl32(pb); /* field size */
	45	flags = avio_rl32(pb); /* field flags */
	46	for (i = 0; i < sizeof(key) - 1; i++) {
	47	c = avio_r8(pb);
	48	if (c < 0x20 \|\| c > 0x7E)
	49	break;
	50	else
	51	key[i] = c;
	52	}
	53	key[i] = 0;
	54	if (c != 0) {
	55	av_log(s, AV_LOG_WARNING, "Invalid APE tag key '%s'.\n", key);
	56	return -1;
	57	}
	58	if (size > INT32_MAX - FF_INPUT_BUFFER_PADDING_SIZE) {
	59	av_log(s, AV_LOG_ERROR, "APE tag size too large.\n");
	60	return AVERROR_INVALIDDATA;
	61	}
	62	if (flags & APE_TAG_FLAG_IS_BINARY) {
	63	uint8_t filename[1024];
	64	enum AVCodecID id;
65	AVStream *st = avformat_new_stream(s, NULL);
66	if (!st)
67	return AVERROR(ENOMEM);
68
69	size -= avio_get_str(pb, size, filename, sizeof(filename));
70	if (size <= 0) {
71	av_log(s, AV_LOG_WARNING, "Skipping binary tag '%s'.\n", key);
72	return 0;
73	}
74
75	av_dict_set(&st->metadata, key, filename, 0);
76
77	if ((id = ff_guess_image2_codec(filename)) != AV_CODEC_ID_NONE) {
78	AVPacket pkt;
79	int ret;
80
81	ret = av_get_packet(s->pb, &pkt, size);
82	if (ret < 0) {
83	av_log(s, AV_LOG_ERROR, "Error reading cover art.\n");
84	return ret;
85	}
86
87	st->disposition \|= AV_DISPOSITION_ATTACHED_PIC;
88	st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
89	st->codec->codec_id = id;
90
91	st->attached_pic = pkt;
92	st->attached_pic.stream_index = st->index;
93	st->attached_pic.flags \|= AV_PKT_FLAG_KEY;
94	} else {
95	if (ff_get_extradata(st->codec, s->pb, size) < 0)
96	return AVERROR(ENOMEM);
97	st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
98	}
99	} else {
100	value = av_malloc(size+1);
101	if (!value)
102	return AVERROR(ENOMEM);
103	c = avio_read(pb, value, size);
104	if (c < 0) {
105	av_free(value);
106	return c;
107	}
108	value[c] = 0;
109	av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
110	}
111	return 0;
112	}
113
114	int64_t ff_ape_parse_tag(AVFormatContext *s)
115	{
116	AVIOContext *pb = s->pb;
117	int64_t file_size = avio_size(pb);
118	uint32_t val, fields, tag_bytes;
119	uint8_t buf[8];
120	int64_t tag_start;
121	int i;
122
123	if (file_size < APE_TAG_FOOTER_BYTES)
124	return 0;
125
126	avio_seek(pb, file_size - APE_TAG_FOOTER_BYTES, SEEK_SET);
127
128	avio_read(pb, buf, 8); /* APETAGEX */
129	if (strncmp(buf, APE_TAG_PREAMBLE, 8)) {
130	return 0;
131	}
132
133	val = avio_rl32(pb); /* APE tag version */
134	if (val > APE_TAG_VERSION) {
135	av_log(s, AV_LOG_ERROR, "Unsupported tag version. (>=%d)\n", APE_TAG_VERSION);
136	return 0;
137	}
138
139	tag_bytes = avio_rl32(pb); /* tag size */
140	if (tag_bytes - APE_TAG_FOOTER_BYTES > (1024 * 1024 * 16)) {
141	av_log(s, AV_LOG_ERROR, "Tag size is way too big\n");
142	return 0;
143	}
144
145	if (tag_bytes > file_size - APE_TAG_FOOTER_BYTES) {
146	av_log(s, AV_LOG_ERROR, "Invalid tag size %"PRIu32".\n", tag_bytes);
147	return 0;
148	}
149	tag_start = file_size - tag_bytes - APE_TAG_FOOTER_BYTES;
150
151	fields = avio_rl32(pb); /* number of fields */
152	if (fields > 65536) {
153	av_log(s, AV_LOG_ERROR, "Too many tag fields (%"PRIu32")\n", fields);
154	return 0;
155	}
156
157	val = avio_rl32(pb); /* flags */
158	if (val & APE_TAG_FLAG_IS_HEADER) {
159	av_log(s, AV_LOG_ERROR, "APE Tag is a header\n");
160	return 0;
161	}
162
163	avio_seek(pb, file_size - tag_bytes, SEEK_SET);
164
165	for (i=0; i<fields; i++)
166	if (ape_tag_read_field(s) < 0) break;
167
168	return tag_start;
169	}
170
171	static int string_is_ascii(const uint8_t *str)
172	{
173	while (str && str >= 0x20 && *str <= 0x7e ) str++;
174	return !*str;
175	}
176
177	int ff_ape_write_tag(AVFormatContext *s)
178	{
179	AVDictionaryEntry *e = NULL;
180	int size, ret, count = 0;
181	AVIOContext *dyn_bc = NULL;
182	uint8_t *dyn_buf = NULL;
183
184	if ((ret = avio_open_dyn_buf(&dyn_bc)) < 0)
185	goto end;
186
187	// flags
188	avio_wl32(dyn_bc, APE_TAG_FLAG_CONTAINS_HEADER \| APE_TAG_FLAG_CONTAINS_FOOTER \|
189	APE_TAG_FLAG_IS_HEADER);
190	ffio_fill(dyn_bc, 0, 8); // reserved
191
192	while ((e = av_dict_get(s->metadata, "", e, AV_DICT_IGNORE_SUFFIX))) {
193	int val_len;
194
195	if (!string_is_ascii(e->key)) {
196	av_log(s, AV_LOG_WARNING, "Non ASCII keys are not allowed\n");
197	continue;
198	}
199
200	val_len = strlen(e->value);
201	avio_wl32(dyn_bc, val_len); // value length
202	avio_wl32(dyn_bc, 0); // item flags
203	avio_put_str(dyn_bc, e->key); // key
204	avio_write(dyn_bc, e->value, val_len); // value
205	count++;
206	}
207	if (!count)
208	goto end;
209
210	size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
211	if (size <= 0)
212	goto end;
213	size += 20;
214
215	// header
216	avio_write(s->pb, "APETAGEX", 8); // id
217	avio_wl32(s->pb, APE_TAG_VERSION); // version
218	avio_wl32(s->pb, size);
219	avio_wl32(s->pb, count);
220
221	avio_write(s->pb, dyn_buf, size - 20);
222
223	// footer
224	avio_write(s->pb, "APETAGEX", 8); // id
225	avio_wl32(s->pb, APE_TAG_VERSION); // version
226	avio_wl32(s->pb, size); // size
227	avio_wl32(s->pb, count); // tag count
228
229	// flags
230	avio_wl32(s->pb, APE_TAG_FLAG_CONTAINS_HEADER \| APE_TAG_FLAG_CONTAINS_FOOTER);
231	ffio_fill(s->pb, 0, 8); // reserved
232
233	end:
234	if (dyn_bc && !dyn_buf)
235	avio_close_dyn_buf(dyn_bc, &dyn_buf);
236	av_freep(&dyn_buf);
237
238	return ret;
239	}