add fuzzers and build script from OSS-Fuzz

diff --git a/contrib/oss-fuzz/build.sh b/contrib/oss-fuzz/build.sh
new file mode 100755 (executable)
index 0000000..29e7f38
--- /dev/null
+++ b/contrib/oss-fuzz/build.sh
@@ -0,0 +1,23 @@
+#!/bin/bash -eu
+
+pushd $SRC
+mv people.xiph.org/*.ogg decode_corpus/
+zip -r "$OUT/decode_fuzzer_seed_corpus.zip" decode_corpus/
+popd
+
+pushd $SRC/ogg
+./autogen.sh
+./configure --prefix="$WORK" --enable-static --disable-shared --disable-crc
+make clean
+make -j$(nproc)
+make install
+popd
+
+
+./autogen.sh
+./configure --prefix="$WORK" --enable-static --disable-shared
+make clean
+make -j$(nproc)
+make install
+
+$CXX $CXXFLAGS $SRC/vorbis/contrib/oss-fuzz/decode_fuzzer.cc -o $OUT/decode_fuzzer -L"$WORK/lib" -I"$WORK/include" -lFuzzingEngine -lvorbisfile -lvorbis -logg

diff --git a/contrib/oss-fuzz/decode_fuzzer.cc b/contrib/oss-fuzz/decode_fuzzer.cc
new file mode 100644 (file)
index 0000000..b8840c1
--- /dev/null
+++ b/contrib/oss-fuzz/decode_fuzzer.cc
@@ -0,0 +1,48 @@
+#include <stdio.h>
+#include <string.h>
+#include <cstdint>
+#include <vorbis/vorbisfile.h>
+
+struct vorbis_data {
+  const uint8_t *current;
+  const uint8_t *data;
+  size_t size;
+};
+
+size_t read_func(void *ptr, size_t size1, size_t size2, void *datasource) {
+  vorbis_data* vd = (vorbis_data *)(datasource);
+  size_t len = size1 * size2;
+  if (vd->current + len > vd->data + vd->size) {
+      len = vd->data + vd->size - vd->current;
+  }
+  memcpy(ptr, vd->current, len);
+  vd->current += len;
+  return len;
+}
+
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+  ov_callbacks memory_callbacks = {0};
+  memory_callbacks.read_func = read_func;
+  vorbis_data data_st;
+  data_st.size = Size;
+  data_st.current = Data;
+  data_st.data = Data;
+  OggVorbis_File vf;
+  int result = ov_open_callbacks(&data_st, &vf, NULL, 0, memory_callbacks);
+  if (result < 0) {
+    return 0;
+  }
+  int current_section = 0;
+  int eof = 0;
+  char buf[4096];
+  int read_result;
+  while (!eof) {
+    read_result = ov_read(&vf, buf, sizeof(buf), 0, 2, 1, &current_section);
+    if (read_result != OV_HOLE && read_result <= 0) {
+      eof = 1;
+    }
+  }
+  ov_clear(&vf);
+  return 0;
+}