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"
22 #include "libavcodec/avcodec.h"
23 #include "libavcodec/bytestream.h"
24 #include "libavformat/avformat.h"
27 typedef struct IOContext {
34 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
36 static void error(const char *err)
38 fprintf(stderr, "%s", err);
42 static int io_read(void *opaque, uint8_t *buf, int buf_size)
44 IOContext *c = opaque;
45 int size = FFMIN(buf_size, c->fuzz_size);
48 c->filesize = FFMIN(c->pos, c->filesize);
52 memcpy(buf, c->fuzz, size);
56 c->filesize = FFMAX(c->filesize, c->pos);
61 static int64_t io_seek(void *opaque, int64_t offset, int whence)
63 IOContext *c = opaque;
65 if (whence == SEEK_CUR) {
66 if (offset > INT64_MAX - c->pos)
69 } else if (whence == SEEK_END) {
70 if (offset > INT64_MAX - c->filesize)
72 offset += c->filesize;
74 if (offset < 0 || offset > c->filesize)
80 // Ensure we don't loop forever
81 const uint32_t maxiteration = 8096;
83 static const uint64_t FUZZ_TAG = 0x4741542D5A5A5546ULL;
85 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
86 const uint64_t fuzz_tag = FUZZ_TAG;
88 AVFormatContext *avfmt = avformat_alloc_context();
90 char filename[1025] = {0};
91 AVIOContext *fuzzed_pb = NULL;
93 int io_buffer_size = 32768;
94 int64_t filesize = size;
102 avcodec_register_all();
103 av_log_set_level(AV_LOG_PANIC);
108 error("Failed avformat_alloc_context()");
112 memcpy (filename, data + size - 1024, 1024);
113 bytestream2_init(&gbc, data + size - 2048, 1024);
116 io_buffer_size = bytestream2_get_le32(&gbc) & 0xFFFFFFF;
117 seekable = bytestream2_get_byte(&gbc) & 1;
118 filesize = bytestream2_get_le64(&gbc) & 0x7FFFFFFFFFFFFFFF;
120 io_buffer = av_malloc(io_buffer_size);
122 error("Failed to allocate io_buffer");
124 opaque.filesize = filesize;
127 opaque.fuzz_size= size;
128 fuzzed_pb = avio_alloc_context(io_buffer, io_buffer_size, 0, &opaque,
129 io_read, NULL, seekable ? io_seek : NULL);
131 error("avio_alloc_context failed");
133 avfmt->pb = fuzzed_pb;
135 ret = avformat_open_input(&avfmt, filename, NULL, NULL);
137 av_freep(&fuzzed_pb->buffer);
138 av_freep(&fuzzed_pb);
139 avformat_free_context(avfmt);
143 ret = avformat_find_stream_info(avfmt, NULL);
145 av_init_packet(&pkt);
149 for(it = 0; it < maxiteration; it++) {
150 ret = av_read_frame(avfmt, &pkt);
153 av_packet_unref(&pkt);
156 av_freep(&fuzzed_pb->buffer);
157 av_freep(&fuzzed_pb);
158 avformat_close_input(&avfmt);