1 files changed, 38 insertions, 0 deletions
diff --git a/runtime/base/unix_file/random_access_file_utils.cc b/runtime/base/unix_file/random_access_file_utils.cc
new file mode 100644
index 0000000000..df3b308bb0
--- /dev/null
+++ b/runtime/base/unix_file/random_access_file_utils.cc
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#include <vector>
+#include "base/unix_file/random_access_file_utils.h"
+#include "base/unix_file/random_access_file.h"
+
+namespace unix_file {
+
+bool CopyFile(const RandomAccessFile& src, RandomAccessFile* dst) {
+  // We don't call src->GetLength because some files (those in /proc, say)
+  // don't know how long they are. We just read until there's nothing left.
+  std::vector<char> buf(4096);
+  int64_t offset = 0;
+  int64_t n;
+  while ((n = src.Read(&buf[0], buf.size(), offset)) > 0) {
+    if (dst->Write(&buf[0], n, offset) != n) {
+      return false;
+    }
+    offset += n;
+  }
+  return n >= 0;
+}
+
+}  // namespace unix_file