1 files changed, 86 insertions, 0 deletions
diff --git a/chromium/mojo/system/raw_shared_buffer.cc b/chromium/mojo/system/raw_shared_buffer.cc
new file mode 100644
index 00000000000..e6e3ebce239
--- /dev/null
+++ b/chromium/mojo/system/raw_shared_buffer.cc
@@ -0,0 +1,86 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "mojo/system/raw_shared_buffer.h"
+
+#include "base/logging.h"
+#include "mojo/embedder/platform_handle_utils.h"
+
+namespace mojo {
+namespace system {
+
+// static
+RawSharedBuffer* RawSharedBuffer::Create(size_t num_bytes) {
+  DCHECK_GT(num_bytes, 0u);
+
+  RawSharedBuffer* rv = new RawSharedBuffer(num_bytes);
+  if (!rv->Init()) {
+    // We can't just delete it directly, due to the "in destructor" (debug)
+    // check.
+    scoped_refptr<RawSharedBuffer> deleter(rv);
+    return NULL;
+  }
+
+  return rv;
+}
+
+RawSharedBuffer* RawSharedBuffer::CreateFromPlatformHandle(
+    size_t num_bytes,
+    embedder::ScopedPlatformHandle platform_handle) {
+  DCHECK_GT(num_bytes, 0u);
+
+  RawSharedBuffer* rv = new RawSharedBuffer(num_bytes);
+  if (!rv->InitFromPlatformHandle(platform_handle.Pass())) {
+    // We can't just delete it directly, due to the "in destructor" (debug)
+    // check.
+    scoped_refptr<RawSharedBuffer> deleter(rv);
+    return NULL;
+  }
+
+  return rv;
+}
+
+scoped_ptr<RawSharedBufferMapping> RawSharedBuffer::Map(size_t offset,
+                                                        size_t length) {
+  if (!IsValidMap(offset, length))
+    return scoped_ptr<RawSharedBufferMapping>();
+
+  return MapNoCheck(offset, length);
+}
+
+bool RawSharedBuffer::IsValidMap(size_t offset, size_t length) {
+  if (offset > num_bytes_ || length == 0)
+    return false;
+
+  // Note: This is an overflow-safe check of |offset + length > num_bytes_|
+  // (that |num_bytes >= offset| is verified above).
+  if (length > num_bytes_ - offset)
+    return false;
+
+  return true;
+}
+
+scoped_ptr<RawSharedBufferMapping> RawSharedBuffer::MapNoCheck(size_t offset,
+                                                               size_t length) {
+  DCHECK(IsValidMap(offset, length));
+  return MapImpl(offset, length);
+}
+
+embedder::ScopedPlatformHandle RawSharedBuffer::DuplicatePlatformHandle() {
+  return embedder::DuplicatePlatformHandle(handle_.get());
+}
+
+embedder::ScopedPlatformHandle RawSharedBuffer::PassPlatformHandle() {
+  DCHECK(HasOneRef());
+  return handle_.Pass();
+}
+
+RawSharedBuffer::RawSharedBuffer(size_t num_bytes) : num_bytes_(num_bytes) {
+}
+
+RawSharedBuffer::~RawSharedBuffer() {
+}
+
+}  // namespace system
+}  // namespace mojo