doc/examples/decoder_targeted: move to tools/target_dec_fuzzer.c

Name and purpose are more appropriate there since the code isn't
an ideal example.

Reviewed-by: wm4 <nfxjfg@googlemail.com>
Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>

1 files changed, 0 insertions, 208 deletions

diff --git a/doc/examples/decoder_targeted.c b/doc/examples/decoder_targeted.c
deleted file mode 100644
index 030eba6227..0000000000
--- a/doc/examples/decoder_targeted.c
+++ /dev/null
@@ -1,208 +0,0 @@
-/*
- * 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
- */
-
-/* Targeted fuzzer that targets specific codecs depending on two
-   compile-time flags.
-  INSTRUCTIONS:
-
-  * Get the very fresh clang, e.g. see http://libfuzzer.info#versions
-  * Get and build libFuzzer:
-     svn co http://llvm.org/svn/llvm-project/llvm/trunk/lib/Fuzzer
-     ./Fuzzer/build.sh
-  * build ffmpeg for fuzzing:
-    FLAGS="-fsanitize=address -fsanitize-coverage=trace-pc-guard,trace-cmp -g" CC="clang $FLAGS" CXX="clang++ $FLAGS" ./configure  --disable-yasm
-    make clean && make -j
-  * build the fuzz target.
-    Choose the value of FFMPEG_CODEC (e.g. AV_CODEC_ID_DVD_SUBTITLE) and
-    choose one of FUZZ_FFMPEG_VIDEO, FUZZ_FFMPEG_AUDIO, FUZZ_FFMPEG_SUBTITLE.
-    clang -fsanitize=address -fsanitize-coverage=trace-pc-guard,trace-cmp doc/examples/decoder_targeted.c -o decoder_targeted -I.   -DFFMPEG_CODEC=AV_CODEC_ID_MPEG1VIDEO -DFUZZ_FFMPEG_VIDEO ../../libfuzzer/libFuzzer.a   -Llibavcodec -Llibavdevice -Llibavfilter -Llibavformat -Llibavresample -Llibavutil -Llibpostproc -Llibswscale -Llibswresample -Wl,--as-needed -Wl,-z,noexecstack -Wl,--warn-common -Wl,-rpath-link=libpostproc:libswresample:libswscale:libavfilter:libavdevice:libavformat:libavcodec:libavutil:libavresample -lavdevice -lavfilter -lavformat -lavcodec -lswresample -lswscale -lavutil -ldl -lxcb -lxcb-shm -lxcb -lxcb-xfixes  -lxcb -lxcb-shape -lxcb -lX11 -lasound -lm -lbz2 -lz -pthread
-  * create a corpus directory and put some samples there (empty dir is ok too):
-    mkdir CORPUS && cp some-files CORPUS
-
-  * Run fuzzing:
-    ./decoder_targeted -max_len=100000 CORPUS
-
-   More info:
-   http://libfuzzer.info
-   http://tutorial.libfuzzer.info
-   https://github.com/google/oss-fuzz
-   http://lcamtuf.coredump.cx/afl/
-   https://security.googleblog.com/2016/08/guided-in-process-fuzzing-of-chrome.html
-*/
-
-#include "libavutil/avassert.h"
-
-#include "libavcodec/avcodec.h"
-#include "libavformat/avformat.h"
-
-static void error(const char *err)
-{
-    fprintf(stderr, "%s", err);
-    exit(1);
-}
-
-static AVCodec *c = NULL;
-static AVCodec *AVCodecInitialize(enum AVCodecID codec_id)
-{
-    AVCodec *res;
-    av_register_all();
-    av_log_set_level(AV_LOG_PANIC);
-    res = avcodec_find_decoder(codec_id);
-    if (!res)
-        error("Failed to find decoder");
-    return res;
-}
-
-#if defined(FUZZ_FFMPEG_VIDEO)
-#define decode_handler avcodec_decode_video2
-#elif defined(FUZZ_FFMPEG_AUDIO)
-#define decode_handler avcodec_decode_audio4
-#elif defined(FUZZ_FFMPEG_SUBTITLE)
-static int subtitle_handler(AVCodecContext *avctx, void *frame,
-                            int *got_sub_ptr, AVPacket *avpkt)
-{
-    AVSubtitle sub;
-    int ret = avcodec_decode_subtitle2(avctx, &sub, got_sub_ptr, avpkt);
-    if (ret >= 0 && *got_sub_ptr)
-        avsubtitle_free(&sub);
-    return ret;
-}
-
-#define decode_handler subtitle_handler
-#else
-#error "Specify encoder type"  // To catch mistakes
-#endif
-
-// Class to handle buffer allocation and resize for each frame
-typedef struct FuzzDataBuffer {
-    size_t size_;
-    uint8_t *data_;
-} FuzzDataBuffer;
-
-void FDBCreate(FuzzDataBuffer *FDB) {
-    FDB->size_ = 0x1000;
-    FDB->data_ = av_malloc(FDB->size_);
-    if (!FDB->data_)
-        error("Failed memory allocation");
-}
-
-void FDBDesroy(FuzzDataBuffer *FDB) { av_free(FDB->data_); }
-
-void FDBRealloc(FuzzDataBuffer *FDB, size_t size) {
-    size_t needed = size + FF_INPUT_BUFFER_PADDING_SIZE;
-    av_assert0(needed > size);
-    if (needed > FDB->size_) {
-        av_free(FDB->data_);
-        FDB->size_ = needed;
-        FDB->data_ = av_malloc(FDB->size_);
-        if (!FDB->data_)
-            error("Failed memory allocation");
-    }
-}
-
-void FDBPrepare(FuzzDataBuffer *FDB, AVPacket *dst, const uint8_t *data,
-                size_t size)
-{
-    FDBRealloc(FDB, size);
-    memcpy(FDB->data_, data, size);
-    size_t padd = FDB->size_ - size;
-    if (padd > FF_INPUT_BUFFER_PADDING_SIZE)
-        padd = FF_INPUT_BUFFER_PADDING_SIZE;
-    memset(FDB->data_ + size, 0, padd);
-    av_init_packet(dst);
-    dst->data = FDB->data_;
-    dst->size = size;
-}
-
-// Ensure we don't loop forever
-const uint32_t maxiteration = 8096;
-
-static const uint64_t FUZZ_TAG = 0x4741542D5A5A5546ULL;
-
-int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
-    const uint64_t fuzz_tag = FUZZ_TAG;
-    FuzzDataBuffer buffer;
-    const uint8_t *last = data;
-    const uint8_t *end = data + size;
-    uint32_t it = 0;
-
-    if (!c)
-        c = AVCodecInitialize(FFMPEG_CODEC);  // Done once.
-
-    AVCodecContext* ctx = avcodec_alloc_context3(NULL);
-    if (!ctx)
-        error("Failed memory allocation");
-
-    ctx->max_pixels = 4096 * 4096; //To reduce false positive OOM and hangs
-
-    int res = avcodec_open2(ctx, c, NULL);
-    if (res < 0)
-        return res;
-
-    FDBCreate(&buffer);
-    int got_frame;
-    AVFrame *frame = av_frame_alloc();
-    if (!frame)
-        error("Failed memory allocation");
-
-    // Read very simple container
-    AVPacket avpkt;
-    while (data < end && it < maxiteration) {
-        // Search for the TAG
-        while (data + sizeof(fuzz_tag) < end) {
-            if (data[0] == (fuzz_tag & 0xFF) && *(const uint64_t *)(data) == fuzz_tag)
-                break;
-            data++;
-        }
-        if (data + sizeof(fuzz_tag) > end)
-            data = end;
-
-        FDBPrepare(&buffer, &avpkt, last, data - last);
-        data += sizeof(fuzz_tag);
-        last = data;
-
-        // Iterate through all data
-        while (avpkt.size > 0 && it++ < maxiteration) {
-            av_frame_unref(frame);
-            int ret = decode_handler(ctx, frame, &got_frame, &avpkt);
-
-            if (it > 20)
-                ctx->error_concealment = 0;
-
-            if (ret <= 0 || ret > avpkt.size)
-               break;
-            avpkt.data += ret;
-            avpkt.size -= ret;
-        }
-    }
-
-    av_init_packet(&avpkt);
-    avpkt.data = NULL;
-    avpkt.size = 0;
-
-    do {
-        got_frame = 0;
-        decode_handler(ctx, frame, &got_frame, &avpkt);
-    } while (got_frame == 1 && it++ < maxiteration);
-
-    av_frame_free(&frame);
-    avcodec_free_context(&ctx);
-    av_freep(&ctx);
-    FDBDesroy(&buffer);
-    return 0;
-}