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// 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 <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <utility>
#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,
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 {
// 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(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 =
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;
}
}
}
bool BlockingCopyToFile(ScopedDataPipeConsumerHandle source,
const base::FilePath& destination) {
base::ScopedFILE fp(base::OpenFile(destination, "wb"));
if (!fp)
return false;
return BlockingCopyHelper(std::move(source),
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
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