2 * This file is part of FFmpeg.
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 #include "libavutil/avassert.h"
21 #include "libavutil/avstring.h"
23 #include "libavcodec/avcodec.h"
24 #include "libavcodec/bytestream.h"
25 #include "libavformat/avformat.h"
28 typedef struct IOContext {
35 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
37 static void error(const char *err)
39 fprintf(stderr, "%s", err);
43 static int io_read(void *opaque, uint8_t *buf, int buf_size)
45 IOContext *c = opaque;
46 int size = FFMIN(buf_size, c->fuzz_size);
49 c->filesize = FFMIN(c->pos, c->filesize);
53 memcpy(buf, c->fuzz, size);
57 c->filesize = FFMAX(c->filesize, c->pos);
62 static int64_t io_seek(void *opaque, int64_t offset, int whence)
64 IOContext *c = opaque;
66 if (whence == SEEK_CUR) {
67 if (offset > INT64_MAX - c->pos)
70 } else if (whence == SEEK_END) {
71 if (offset > INT64_MAX - c->filesize)
73 offset += c->filesize;
74 } else if (whence == AVSEEK_SIZE) {
77 if (offset < 0 || offset > c->filesize)
83 // Ensure we don't loop forever
84 const uint32_t maxiteration = 8096;
86 static const uint64_t FUZZ_TAG = 0x4741542D5A5A5546ULL;
88 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
89 const uint64_t fuzz_tag = FUZZ_TAG;
91 AVFormatContext *avfmt = avformat_alloc_context();
93 char filename[1025] = {0};
94 AVIOContext *fuzzed_pb = NULL;
96 int io_buffer_size = 32768;
97 int64_t filesize = size;
105 avcodec_register_all();
106 av_log_set_level(AV_LOG_PANIC);
111 error("Failed avformat_alloc_context()");
118 memcpy (filename, data + size - 1024, 1024);
119 bytestream2_init(&gbc, data + size - 2048, 1024);
122 io_buffer_size = bytestream2_get_le32(&gbc) & 0xFFFFFFF;
123 flags = bytestream2_get_byte(&gbc);
124 seekable = flags & 1;
125 filesize = bytestream2_get_le64(&gbc) & 0x7FFFFFFFFFFFFFFF;
127 if ((flags & 2) && strlen(filename) < sizeof(filename) / 2) {
128 AVInputFormat *avif = NULL;
130 while ((avif = av_iformat_next(avif))) {
131 if (avif->extensions)
134 avif_count = bytestream2_get_le32(&gbc) % avif_count;
136 while ((avif = av_iformat_next(avif))) {
137 if (avif->extensions)
141 av_strlcpy(extension, avif->extensions, sizeof(extension));
142 if (strchr(extension, ','))
143 *strchr(extension, ',') = 0;
144 av_strlcatf(filename, sizeof(filename), ".%s", extension);
147 io_buffer = av_malloc(io_buffer_size);
149 error("Failed to allocate io_buffer");
151 opaque.filesize = filesize;
154 opaque.fuzz_size= size;
155 fuzzed_pb = avio_alloc_context(io_buffer, io_buffer_size, 0, &opaque,
156 io_read, NULL, seekable ? io_seek : NULL);
158 error("avio_alloc_context failed");
160 avfmt->pb = fuzzed_pb;
162 ret = avformat_open_input(&avfmt, filename, NULL, NULL);
164 av_freep(&fuzzed_pb->buffer);
165 av_freep(&fuzzed_pb);
166 avformat_free_context(avfmt);
170 ret = avformat_find_stream_info(avfmt, NULL);
172 av_init_packet(&pkt);
176 for(it = 0; it < maxiteration; it++) {
177 ret = av_read_frame(avfmt, &pkt);
180 av_packet_unref(&pkt);
183 av_freep(&fuzzed_pb->buffer);
184 av_freep(&fuzzed_pb);
185 avformat_close_input(&avfmt);