FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/apetag.c
Date: 2025-10-19 14:07:46
Exec Total Coverage
Lines: 91 123 74.0%
Functions: 4 4 100.0%
Branches: 39 66 59.1%
Line Branch Exec Source
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/dict.h"
26 #include "libavutil/mem.h"
27 #include "avformat.h"
28 #include "avio_internal.h"
29 #include "apetag.h"
30 #include "demux.h"
31 #include "internal.h"
32 #include "mux.h"
33
34 #define APE_TAG_FLAG_CONTAINS_HEADER (1U << 31)
35 #define APE_TAG_FLAG_LACKS_FOOTER (1 << 30)
36 #define APE_TAG_FLAG_IS_HEADER (1 << 29)
37 #define APE_TAG_FLAG_IS_BINARY (1 << 1)
38
39 33 static int ape_tag_read_field(AVFormatContext *s)
40 {
41 33 AVIOContext *pb = s->pb;
42 uint8_t key[1024], *value;
43 int64_t size, flags;
44 int i, c;
45
46 33 size = avio_rl32(pb); /* field size */
47 33 flags = avio_rl32(pb); /* field flags */
48
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 232 for (i = 0; i < sizeof(key) - 1; i++) {
49 232 c = avio_r8(pb);
50
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 232 if (c < 0x20 || c > 0x7E)
51 break;
52 else
53 199 key[i] = c;
54 }
55 33 key[i] = 0;
56
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 33 if (c != 0) {
57 ✗ av_log(s, AV_LOG_WARNING, "Invalid APE tag key '%s'.\n", key);
58 ✗ return -1;
59 }
60
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 33 if (size > INT32_MAX - AV_INPUT_BUFFER_PADDING_SIZE) {
61 ✗ av_log(s, AV_LOG_ERROR, "APE tag size too large.\n");
62 ✗ return AVERROR_INVALIDDATA;
63 }
64
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 33 if (flags & APE_TAG_FLAG_IS_BINARY) {
65 uint8_t filename[1024];
66 enum AVCodecID id;
67 int ret;
68 2 AVStream *st = avformat_new_stream(s, NULL);
69
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 2 if (!st)
70 ✗ return AVERROR(ENOMEM);
71
72 2 ret = avio_get_str(pb, size, filename, sizeof(filename));
73
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 2 if (ret < 0)
74 ✗ return ret;
75
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 2 if (size <= ret) {
76 ✗ av_log(s, AV_LOG_WARNING, "Skipping binary tag '%s'.\n", key);
77 ✗ return 0;
78 }
79 2 size -= ret;
80
81 2 av_dict_set(&st->metadata, key, filename, 0);
82
83
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 2 if ((id = ff_guess_image2_codec(filename)) != AV_CODEC_ID_NONE) {
84 2 int ret = ff_add_attached_pic(s, st, s->pb, NULL, size);
85
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 2 if (ret < 0) {
86 ✗ av_log(s, AV_LOG_ERROR, "Error reading cover art.\n");
87 ✗ return ret;
88 }
89 2 st->codecpar->codec_id = id;
90 } else {
91 ✗ if ((ret = ff_get_extradata(s, st->codecpar, s->pb, size)) < 0)
92 ✗ return ret;
93 ✗ st->codecpar->codec_type = AVMEDIA_TYPE_ATTACHMENT;
94 }
95 } else {
96 31 value = av_malloc(size+1);
97
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 31 if (!value)
98 ✗ return AVERROR(ENOMEM);
99 31 c = avio_read(pb, value, size);
100
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 31 if (c < 0) {
101 ✗ av_free(value);
102 ✗ return c;
103 }
104 31 value[c] = 0;
105 31 av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
106 }
107 33 return 0;
108 }
109
110 89 int64_t ff_ape_parse_tag(AVFormatContext *s)
111 {
112 89 AVIOContext *pb = s->pb;
113 89 int64_t file_size = avio_size(pb);
114 uint32_t val, fields, tag_bytes;
115 uint8_t buf[8];
116 int64_t tag_start;
117 int i;
118
119
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 89 if (file_size < APE_TAG_FOOTER_BYTES)
120 ✗ return 0;
121
122 89 avio_seek(pb, file_size - APE_TAG_FOOTER_BYTES, SEEK_SET);
123
124
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 89 if(avio_read(pb, buf, 8) != 8) /* APETAGEX */
125 ✗ return 0;
126
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 89 if (strncmp(buf, APE_TAG_PREAMBLE, 8)) {
127 80 return 0;
128 }
129
130 9 val = avio_rl32(pb); /* APE tag version */
131
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 9 if (val > APE_TAG_VERSION) {
132 ✗ av_log(s, AV_LOG_ERROR, "Unsupported tag version. (>=%d)\n", APE_TAG_VERSION);
133 ✗ return 0;
134 }
135
136 9 tag_bytes = avio_rl32(pb); /* tag size */
137
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 9 if (tag_bytes - APE_TAG_FOOTER_BYTES > (1024 * 1024 * 16)) {
138 ✗ av_log(s, AV_LOG_ERROR, "Tag size is way too big\n");
139 ✗ return 0;
140 }
141
142
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 9 if (tag_bytes > file_size - APE_TAG_FOOTER_BYTES) {
143 ✗ av_log(s, AV_LOG_ERROR, "Invalid tag size %"PRIu32".\n", tag_bytes);
144 ✗ return 0;
145 }
146
147 9 fields = avio_rl32(pb); /* number of fields */
148
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 9 if (fields > 65536) {
149 ✗ av_log(s, AV_LOG_ERROR, "Too many tag fields (%"PRIu32")\n", fields);
150 ✗ return 0;
151 }
152
153 9 val = avio_rl32(pb); /* flags */
154
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 9 if (val & APE_TAG_FLAG_IS_HEADER) {
155 ✗ av_log(s, AV_LOG_ERROR, "APE Tag is a header\n");
156 ✗ return 0;
157 }
158
159 9 avio_seek(pb, file_size - tag_bytes, SEEK_SET);
160
161
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 9 if (val & APE_TAG_FLAG_CONTAINS_HEADER)
162 9 tag_bytes += APE_TAG_HEADER_BYTES;
163
164 9 tag_start = file_size - tag_bytes;
165
166
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 42 for (i=0; i<fields; i++)
167
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 33 if (ape_tag_read_field(s) < 0) break;
168
169 9 return tag_start;
170 }
171
172 2 static int string_is_ascii(const uint8_t *str)
173 {
174
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 12 while (*str && *str >= 0x20 && *str <= 0x7e ) str++;
175 2 return !*str;
176 }
177
178 4 int ff_ape_write_tag(AVFormatContext *s)
179 {
180 4 const AVDictionaryEntry *e = NULL;
181 4 int size, ret, count = 0;
182 AVIOContext *dyn_bc;
183 uint8_t *dyn_buf;
184
185
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 4 if ((ret = avio_open_dyn_buf(&dyn_bc)) < 0)
186 ✗ return ret;
187
188 4 ff_standardize_creation_time(s);
189
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 6 while ((e = av_dict_iterate(s->metadata, e))) {
190 int val_len;
191
192
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 2 if (!string_is_ascii(e->key)) {
193 ✗ av_log(s, AV_LOG_WARNING, "Non ASCII keys are not allowed\n");
194 ✗ continue;
195 }
196
197 2 val_len = strlen(e->value);
198 2 avio_wl32(dyn_bc, val_len); // value length
199 2 avio_wl32(dyn_bc, 0); // item flags
200 2 avio_put_str(dyn_bc, e->key); // key
201 2 avio_write(dyn_bc, e->value, val_len); // value
202 2 count++;
203 }
204
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 4 if (!count)
205 2 goto end;
206
207 2 size = avio_get_dyn_buf(dyn_bc, &dyn_buf);
208
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 2 if (size <= 0)
209 ✗ goto end;
210 2 size += APE_TAG_FOOTER_BYTES;
211
212 // header
213 2 avio_write(s->pb, "APETAGEX", 8); // id
214 2 avio_wl32(s->pb, APE_TAG_VERSION); // version
215 2 avio_wl32(s->pb, size);
216 2 avio_wl32(s->pb, count);
217
218 // flags
219 2 avio_wl32(s->pb, APE_TAG_FLAG_CONTAINS_HEADER | APE_TAG_FLAG_IS_HEADER);
220 2 ffio_fill(s->pb, 0, 8); // reserved
221
222 2 avio_write(s->pb, dyn_buf, size - APE_TAG_FOOTER_BYTES);
223
224 // footer
225 2 avio_write(s->pb, "APETAGEX", 8); // id
226 2 avio_wl32(s->pb, APE_TAG_VERSION); // version
227 2 avio_wl32(s->pb, size); // size
228 2 avio_wl32(s->pb, count); // tag count
229
230 // flags
231 2 avio_wl32(s->pb, APE_TAG_FLAG_CONTAINS_HEADER);
232 2 ffio_fill(s->pb, 0, 8); // reserved
233
234 4 end:
235 4 ffio_free_dyn_buf(&dyn_bc);
236
237 4 return ret;
238 }
239