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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 "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/files/scoped_file.h"
#include "base/location.h"
#include "base/task_runner_util.h"
namespace mojo {
namespace common {
namespace {
bool BlockingCopyFromFile(const base::FilePath& source,
ScopedDataPipeProducerHandle destination,
uint32_t skip) {
base::File file(source, base::File::FLAG_OPEN | base::File::FLAG_READ);
if (!file.IsValid())
return false;
if (file.Seek(base::File::FROM_BEGIN, skip) != skip) {
LOG(ERROR) << "Seek of " << skip << " in " << source.value() << " failed";
return false;
}
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) {
int bytes_read =
file.ReadAtCurrentPos(static_cast<char*>(buffer), buffer_num_bytes);
if (bytes_read >= 0) {
EndWriteDataRaw(destination.get(), bytes_read);
if (bytes_read == 0) {
// eof
return true;
}
} else {
// error
EndWriteDataRaw(destination.get(), 0);
return false;
}
} 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;
}
}
#if !defined(OS_WIN)
NOTREACHED();
return false;
#endif
}
} // namespace
void CopyFromFile(const base::FilePath& source,
ScopedDataPipeProducerHandle destination,
uint32_t skip,
base::TaskRunner* task_runner,
const base::Callback<void(bool)>& callback) {
base::PostTaskAndReplyWithResult(task_runner, FROM_HERE,
base::Bind(&BlockingCopyFromFile, source,
base::Passed(&destination), skip),
callback);
}
} // namespace common
} // namespace mojo
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