Update monet.

mojo/data_pipe_utils/data_pipe_utils.cc

+// 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/data_pipe_utils/data_pipe_utils.h"
+
+#include <stdio.h>
+
+#include "base/message_loop/message_loop.h"
+#include "base/task_runner_util.h"
+#include "base/threading/platform_thread.h"
+#include "base/trace_event/trace_event.h"
+#include "mojo/data_pipe_utils/data_pipe_utils_internal.h"
+#include "mojo/public/cpp/system/wait.h"
+
+namespace mojo {
+namespace common {
+
+bool BlockingCopyHelper(
+    ScopedDataPipeConsumerHandle source,
+    const base::Callback<size_t(const void*, uint32_t)>& write_bytes) {
+  for (;;) {
+    const void* buffer = nullptr;
+    uint32_t num_bytes = 0;
+    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);
+      if (bytes_written < num_bytes) {
+        LOG(ERROR) << "write_bytes callback wrote fewer bytes ("
+                   << bytes_written << ") written than expected (" << num_bytes
+                   << ") in BlockingCopyHelper (pipe closed? out of disk "
+                      "space?)";
+        // No need to call EndReadDataRaw(), since |source| will be closed.
+        return false;
+      }
+      result = EndReadDataRaw(source.get(), num_bytes);
+      if (result != MOJO_RESULT_OK) {
+        LOG(ERROR) << "EndReadDataRaw error (" << result
+                   << ") in BlockingCopyHelper";
+        return false;
+      }
+    } else if (result == MOJO_RESULT_SHOULD_WAIT) {
+      result = Wait(source.get(), MOJO_HANDLE_SIGNAL_READABLE,
+                    MOJO_DEADLINE_INDEFINITE, nullptr);
+      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 {
+      LOG(ERROR) << "Unhandled error " << result << " in BlockingCopyHelper";
+      // Some other error occurred.
+      return false;
+    }
+  }
+}
+
+namespace {
+
+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;
+}
+
+}  // namespace
+
+// TODO(hansmuller): Add a max_size parameter.
+bool BlockingCopyToString(ScopedDataPipeConsumerHandle source,
+                          std::string* result) {
+  TRACE_EVENT0("data_pipe_utils", "BlockingCopyToString");
+  CHECK(result);
+  result->clear();
+  return BlockingCopyHelper(source.Pass(),
+                            base::Bind(&CopyToStringHelper, result));
+}
+
+bool BlockingCopyFromString(const std::string& source,
+                            const ScopedDataPipeProducerHandle& destination) {
+  TRACE_EVENT0("data_pipe_utils", "BlockingCopyFromString");
+  auto it = source.begin();
+  for (;;) {
+    void* buffer = nullptr;
+    uint32_t buffer_num_bytes = 0;
+    MojoResult result =
+        BeginWriteDataRaw(destination.get(), &buffer, &buffer_num_bytes,
+                          MOJO_WRITE_DATA_FLAG_NONE);
+    if (result == MOJO_RESULT_OK) {
+      char* char_buffer = static_cast<char*>(buffer);
+      uint32_t byte_index = 0;
+      while (it != source.end() && byte_index < buffer_num_bytes) {
+        char_buffer[byte_index++] = *it++;
+      }
+      EndWriteDataRaw(destination.get(), byte_index);
+      if (it == source.end())
+        return true;
+    } else if (result == MOJO_RESULT_SHOULD_WAIT) {
+      result = Wait(destination.get(), MOJO_HANDLE_SIGNAL_WRITABLE,
+                    MOJO_DEADLINE_INDEFINITE, nullptr);
+      if (result != MOJO_RESULT_OK) {
+        // If the consumer handle was closed, then treat as EOF.
+        return result == MOJO_RESULT_FAILED_PRECONDITION;
+      }
+    } else {
+      // If the consumer handle was closed, then treat as EOF.
+      return result == MOJO_RESULT_FAILED_PRECONDITION;
+    }
+  }
+}
+
+ScopedDataPipeConsumerHandle WriteStringToConsumerHandle(
+    const std::string& source) {
+  TRACE_EVENT0("data_pipe_utils", "WriteStringToConsumerHandle");
+  static const size_t max_buffer_size = 2 * 1024 * 1024;  // 2MB
+  CHECK_LE(static_cast<uint32_t>(source.size()), max_buffer_size);
+  MojoCreateDataPipeOptions options = {sizeof(MojoCreateDataPipeOptions),
+                                       MOJO_CREATE_DATA_PIPE_OPTIONS_FLAG_NONE,
+                                       1, source.size()};
+  DataPipe pipe(options);
+  BlockingCopyFromString(source, pipe.producer_handle.Pass());
+  return pipe.consumer_handle.Pass();
+}
+
+}  // namespace common
+}  // namespace mojo