Clone of chromium aad1ce808763f59c7a3753e08f1500a104ecc6fd refs/remotes/origin/HEAD
diff --git a/mojo/common/data_pipe_utils.cc b/mojo/common/data_pipe_utils.cc
new file mode 100644
index 0000000..428a589
--- /dev/null
+++ b/mojo/common/data_pipe_utils.cc
@@ -0,0 +1,94 @@
+// 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/common/data_pipe_utils.h"
+
+#include <stdio.h>
+
+#include "base/files/file_path.h"
+#include "base/files/file_util.h"
+#include "base/files/scoped_file.h"
+#include "base/message_loop/message_loop.h"
+#include "base/task_runner_util.h"
+
+namespace mojo {
+namespace common {
+namespace {
+
+bool BlockingCopyHelper(ScopedDataPipeConsumerHandle source,
+ const base::Callback<size_t(const void*, uint32_t)>& write_bytes) {
+ for (;;) {
+ const void* buffer;
+ uint32_t num_bytes;
+ MojoResult result = BeginReadDataRaw(
+ source.get(), &buffer, &num_bytes, MOJO_READ_DATA_FLAG_NONE);
+ if (result == MOJO_RESULT_OK) {
+ size_t bytes_written = write_bytes.Run(buffer, num_bytes);
+ result = EndReadDataRaw(source.get(), num_bytes);
+ if (bytes_written < num_bytes || result != MOJO_RESULT_OK)
+ return false;
+ } else if (result == MOJO_RESULT_SHOULD_WAIT) {
+ result = Wait(source.get(),
+ MOJO_HANDLE_SIGNAL_READABLE,
+ MOJO_DEADLINE_INDEFINITE);
+ if (result != MOJO_RESULT_OK) {
+ // If the producer handle was closed, then treat as EOF.
+ return result == MOJO_RESULT_FAILED_PRECONDITION;
+ }
+ } else if (result == MOJO_RESULT_FAILED_PRECONDITION) {
+ // If the producer handle was closed, then treat as EOF.
+ return true;
+ } else {
+ // Some other error occurred.
+ break;
+ }
+ }
+
+ return false;
+}
+
+size_t CopyToStringHelper(
+ std::string* result, const void* buffer, uint32_t num_bytes) {
+ result->append(static_cast<const char*>(buffer), num_bytes);
+ return num_bytes;
+}
+
+size_t CopyToFileHelper(FILE* fp, const void* buffer, uint32_t num_bytes) {
+ return fwrite(buffer, 1, num_bytes, fp);
+}
+
+} // namespace
+
+
+// TODO(hansmuller): Add a max_size parameter.
+bool BlockingCopyToString(ScopedDataPipeConsumerHandle source,
+ std::string* result) {
+ CHECK(result);
+ result->clear();
+ return BlockingCopyHelper(
+ source.Pass(), base::Bind(&CopyToStringHelper, result));
+}
+
+bool BlockingCopyToFile(ScopedDataPipeConsumerHandle source,
+ const base::FilePath& destination) {
+ base::ScopedFILE fp(base::OpenFile(destination, "wb"));
+ if (!fp)
+ return false;
+ return BlockingCopyHelper(
+ source.Pass(), base::Bind(&CopyToFileHelper, fp.get()));
+}
+
+void CopyToFile(ScopedDataPipeConsumerHandle source,
+ const base::FilePath& destination,
+ base::TaskRunner* task_runner,
+ const base::Callback<void(bool)>& callback) {
+ base::PostTaskAndReplyWithResult(
+ task_runner,
+ FROM_HERE,
+ base::Bind(&BlockingCopyToFile, base::Passed(&source), destination),
+ callback);
+}
+
+} // namespace common
+} // namespace mojo
