Moved oss-fuzz files from oss-fuzz to Libarchives repository

contrib/oss-fuzz/libarchive_fuzzer.cc

@@ -0,0 +1,49 @@
+#include <stddef.h>
+#include <stdint.h>
+#include <vector>
+
+#include "archive.h"
+
+struct Buffer {
+  const uint8_t *buf;
+  size_t len;
+};
+
+ssize_t reader_callback(struct archive *a, void *client_data,
+                        const void **block) {
+  Buffer *buffer = reinterpret_cast<Buffer *>(client_data);
+  *block = buffer->buf;
+  ssize_t len = buffer->len;
+  buffer->len = 0;
+  return len;
+}
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
+  int ret;
+  ssize_t r;
+  struct archive *a = archive_read_new();
+
+  archive_read_support_filter_all(a);
+  archive_read_support_format_all(a);
+
+  Buffer buffer = {buf, len};
+  archive_read_open(a, &buffer, NULL, reader_callback, NULL);
+
+  std::vector<uint8_t> data_buffer(getpagesize(), 0);
+  struct archive_entry *entry;
+  while(1) {
+    ret = archive_read_next_header(a, &entry);
+    if (ret == ARCHIVE_EOF || ret == ARCHIVE_FATAL)
+      break;
+    if (ret == ARCHIVE_RETRY)
+      continue;
+    while ((r = archive_read_data(a, data_buffer.data(),
+            data_buffer.size())) > 0)
+      ;
+    if (r == ARCHIVE_FATAL)
+      break;
+  }
+
+  archive_read_free(a);
+  return 0;
+}

contrib/oss-fuzz/oss-fuzz-build.sh

@@ -0,0 +1,16 @@
+# build the project
+./build/autogen.sh
+./configure
+make -j$(nproc) all
+
+# build seed
+cp $SRC/libarchive/contrib/oss-fuzz/corpus.zip\
+       	$OUT/libarchive_fuzzer_seed_corpus.zip
+
+# build fuzzer(s)
+$CXX $CXXFLAGS -Ilibarchive \
+    $SRC/libarchive/contrib/oss-fuzz/libarchive_fuzzer.cc \
+     -o $OUT/libarchive_fuzzer $LIB_FUZZING_ENGINE \
+    .libs/libarchive.a -Wl,-Bstatic -lbz2 -llzo2  \
+    -lxml2 -llzma -lz -lcrypto -llz4 -licuuc \
+    -licudata -Wl,-Bdynamic