blob: b32a171fcc2803ed97c10c4cd1fe5f19a0c6403c [file] [log] [blame]
// 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 <utility>
#include "base/bind.h"
#include "mojo/public/cpp/system/wait.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 =
source->BeginReadData(&buffer, &num_bytes, MOJO_READ_DATA_FLAG_NONE);
if (result == MOJO_RESULT_OK) {
size_t bytes_written = write_bytes.Run(buffer, num_bytes);
result = source->EndReadData(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);
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;
}
} // namespace
// TODO(hansmuller): Add a max_size parameter.
bool BlockingCopyToString(ScopedDataPipeConsumerHandle source,
std::string* result) {
CHECK(result);
result->clear();
return BlockingCopyHelper(std::move(source),
base::Bind(&CopyToStringHelper, result));
}
bool MOJO_COMMON_EXPORT BlockingCopyFromString(
const std::string& source,
const ScopedDataPipeProducerHandle& destination) {
auto it = source.begin();
for (;;) {
void* buffer = nullptr;
uint32_t buffer_num_bytes = 0;
MojoResult result = destination->BeginWriteData(&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++;
}
destination->EndWriteData(byte_index);
if (it == source.end())
return true;
} else if (result == MOJO_RESULT_SHOULD_WAIT) {
result = Wait(destination.get(), MOJO_HANDLE_SIGNAL_WRITABLE);
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;
}
}
}
} // namespace common
} // namespace mojo