[mpg123] Integrate project along with a fuzz target. (#2032)

* Integrate mpg123 along with a fuzz target.

projects/mpg123/Dockerfile

@@ -0,0 +1,25 @@
+# Copyright 2018 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+
+FROM gcr.io/oss-fuzz-base/base-builder
+RUN apt-get update && apt-get install -y make autoconf automake libtool wget \
+  bzip2
+RUN wget https://www.mpg123.de/snapshot
+RUN tar -xvf snapshot
+RUN mv mpg123* mpg123
+WORKDIR $SRC
+COPY read_fuzzer.c $SRC/
+COPY build.sh $SRC/

projects/mpg123/build.sh

@@ -0,0 +1,25 @@
+#!/bin/bash -eu
+# Copyright 2018 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+
+pushd mpg123
+./configure --prefix=$WORK --enable-static
+make -j$(nproc)
+make install
+popd
+
+$CC $CXXFLAGS read_fuzzer.c -I$WORK/include $WORK/lib/libmpg123.a \
+  -lFuzzingEngine -lc++ -o $OUT/read_fuzzer

projects/mpg123/project.yaml

@@ -0,0 +1,11 @@
+homepage: "https://www.mpg123.de"
+primary_contact: "kusano@google.com"
+
+sanitizers:
+  - address
+  - undefined
+  - memory
+
+labels:
+  read_fuzzer:
+    - sundew

projects/mpg123/read_fuzzer.c

@@ -0,0 +1,85 @@
+#include <stddef.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+
+#include "mpg123.h"
+
+static char* fuzzer_get_tmpfile(const uint8_t* data, size_t size) {
+  char* filename_buffer = strdup("/tmp/generate_temporary_file.XXXXXX");
+  if (!filename_buffer) {
+    perror("Failed to allocate file name buffer.");
+    abort();
+  }
+  const int file_descriptor = mkstemp(filename_buffer);
+  if (file_descriptor < 0) {
+    perror("Failed to make temporary file.");
+    abort();
+  }
+  FILE* file = fdopen(file_descriptor, "wb");
+  if (!file) {
+    perror("Failed to open file descriptor.");
+    close(file_descriptor);
+    abort();
+  }
+  const size_t bytes_written = fwrite(data, sizeof(uint8_t), size, file);
+  if (bytes_written < size) {
+    close(file_descriptor);
+    fprintf(stderr, "Failed to write all bytes to file (%zu out of %zu)",
+            bytes_written, size);
+    abort();
+  }
+  fclose(file);
+  return filename_buffer;
+}
+
+static void fuzzer_release_tmpfile(char* filename) {
+  if (unlink(filename) != 0) {
+    perror("WARNING: Failed to delete temporary file.");
+  }
+  free(filename);
+}
+
+int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  static bool initialized = false;
+  if (!initialized) {
+    mpg123_init();
+    initialized = true;
+  }
+  char* filename = fuzzer_get_tmpfile(data, size);
+  if (filename == NULL) {
+    return 0;
+  }
+
+  size_t outmemorysize = size * 2;  // Guess based on the size of data.
+  unsigned char* outmemory = (unsigned char*)malloc(outmemorysize);
+  if (outmemory == NULL) {
+    fuzzer_release_tmpfile(filename);
+    return 0;
+  }
+
+  int error;
+  mpg123_handle* handle = mpg123_new(NULL, &error);
+  if (handle == NULL) {
+    free(outmemory);
+    fuzzer_release_tmpfile(filename);
+    return 0;
+  }
+
+  if (mpg123_open(handle, filename) == MPG123_OK) {
+    int read_error;
+    do {
+      size_t decoded_size;
+      read_error = mpg123_read(handle, outmemory, outmemorysize, &decoded_size);
+    } while (read_error == MPG123_OK);
+  }
+
+  mpg123_close(handle);
+  mpg123_delete(handle);
+  free(outmemory);
+  fuzzer_release_tmpfile(filename);
+  return 0;
+}