96 lines
3.1 KiB
C++
96 lines
3.1 KiB
C++
// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include <utility>
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#include "base/bind.h"
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#include "base/callback.h"
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#include "mojo/public/cpp/system/data_pipe_utils.h"
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#include "mojo/public/cpp/system/wait.h"
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namespace mojo {
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namespace {
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bool BlockingCopyHelper(
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ScopedDataPipeConsumerHandle source,
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const base::Callback<size_t(const void*, uint32_t)>& write_bytes) {
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for (;;) {
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const void* buffer;
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uint32_t num_bytes;
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MojoResult result =
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source->BeginReadData(&buffer, &num_bytes, MOJO_READ_DATA_FLAG_NONE);
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if (result == MOJO_RESULT_OK) {
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size_t bytes_written = write_bytes.Run(buffer, num_bytes);
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result = source->EndReadData(num_bytes);
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if (bytes_written < num_bytes || result != MOJO_RESULT_OK)
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return false;
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} else if (result == MOJO_RESULT_SHOULD_WAIT) {
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result = Wait(source.get(), MOJO_HANDLE_SIGNAL_READABLE);
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if (result != MOJO_RESULT_OK) {
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// If the producer handle was closed, then treat as EOF.
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return result == MOJO_RESULT_FAILED_PRECONDITION;
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}
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} else if (result == MOJO_RESULT_FAILED_PRECONDITION) {
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// If the producer handle was closed, then treat as EOF.
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return true;
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} else {
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// Some other error occurred.
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break;
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}
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}
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return false;
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}
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size_t CopyToStringHelper(std::string* result,
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const void* buffer,
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uint32_t num_bytes) {
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result->append(static_cast<const char*>(buffer), num_bytes);
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return num_bytes;
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}
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} // namespace
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// TODO(hansmuller): Add a max_size parameter.
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bool BlockingCopyToString(ScopedDataPipeConsumerHandle source,
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std::string* result) {
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CHECK(result);
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result->clear();
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return BlockingCopyHelper(std::move(source),
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base::Bind(&CopyToStringHelper, result));
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}
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bool MOJO_CPP_SYSTEM_EXPORT
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BlockingCopyFromString(const std::string& source,
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const ScopedDataPipeProducerHandle& destination) {
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auto it = source.begin();
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for (;;) {
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void* buffer = nullptr;
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uint32_t buffer_num_bytes = 0;
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MojoResult result = destination->BeginWriteData(&buffer, &buffer_num_bytes,
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MOJO_WRITE_DATA_FLAG_NONE);
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if (result == MOJO_RESULT_OK) {
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char* char_buffer = static_cast<char*>(buffer);
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uint32_t byte_index = 0;
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while (it != source.end() && byte_index < buffer_num_bytes) {
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char_buffer[byte_index++] = *it++;
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}
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destination->EndWriteData(byte_index);
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if (it == source.end())
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return true;
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} else if (result == MOJO_RESULT_SHOULD_WAIT) {
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result = Wait(destination.get(), MOJO_HANDLE_SIGNAL_WRITABLE);
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if (result != MOJO_RESULT_OK) {
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// If the consumer handle was closed, then treat as EOF.
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return result == MOJO_RESULT_FAILED_PRECONDITION;
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}
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} else {
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// If the consumer handle was closed, then treat as EOF.
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return result == MOJO_RESULT_FAILED_PRECONDITION;
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}
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}
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}
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} // namespace mojo
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