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// Copyright (c) 2012 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 "net/base/file_stream_context.h"
#include <windows.h>
#include "base/files/file_path.h"
#include "base/logging.h"
#include "base/metrics/histogram.h"
#include "base/task_runner.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
namespace net {
// Ensure that we can just use our Whence values directly.
COMPILE_ASSERT(FROM_BEGIN == FILE_BEGIN, bad_whence_begin);
COMPILE_ASSERT(FROM_CURRENT == FILE_CURRENT, bad_whence_current);
COMPILE_ASSERT(FROM_END == FILE_END, bad_whence_end);
namespace {
void SetOffset(OVERLAPPED* overlapped, const LARGE_INTEGER& offset) {
overlapped->Offset = offset.LowPart;
overlapped->OffsetHigh = offset.HighPart;
}
void IncrementOffset(OVERLAPPED* overlapped, DWORD count) {
LARGE_INTEGER offset;
offset.LowPart = overlapped->Offset;
offset.HighPart = overlapped->OffsetHigh;
offset.QuadPart += static_cast<LONGLONG>(count);
SetOffset(overlapped, offset);
}
} // namespace
FileStream::Context::Context(const scoped_refptr<base::TaskRunner>& task_runner)
: io_context_(),
async_in_progress_(false),
orphaned_(false),
task_runner_(task_runner) {
io_context_.handler = this;
memset(&io_context_.overlapped, 0, sizeof(io_context_.overlapped));
}
FileStream::Context::Context(base::File file,
const scoped_refptr<base::TaskRunner>& task_runner)
: io_context_(),
file_(file.Pass()),
async_in_progress_(false),
orphaned_(false),
task_runner_(task_runner) {
io_context_.handler = this;
memset(&io_context_.overlapped, 0, sizeof(io_context_.overlapped));
if (file_.IsValid()) {
// TODO(hashimoto): Check that file_ is async.
OnAsyncFileOpened();
}
}
FileStream::Context::~Context() {
}
int FileStream::Context::ReadAsync(IOBuffer* buf,
int buf_len,
const CompletionCallback& callback) {
DCHECK(!async_in_progress_);
DWORD bytes_read;
if (!ReadFile(file_.GetPlatformFile(), buf->data(), buf_len,
&bytes_read, &io_context_.overlapped)) {
IOResult error = IOResult::FromOSError(GetLastError());
if (error.os_error == ERROR_IO_PENDING) {
IOCompletionIsPending(callback, buf);
} else if (error.os_error == ERROR_HANDLE_EOF) {
return 0; // Report EOF by returning 0 bytes read.
} else {
LOG(WARNING) << "ReadFile failed: " << error.os_error;
}
return error.result;
}
IOCompletionIsPending(callback, buf);
return ERR_IO_PENDING;
}
int FileStream::Context::WriteAsync(IOBuffer* buf,
int buf_len,
const CompletionCallback& callback) {
DWORD bytes_written = 0;
if (!WriteFile(file_.GetPlatformFile(), buf->data(), buf_len,
&bytes_written, &io_context_.overlapped)) {
IOResult error = IOResult::FromOSError(GetLastError());
if (error.os_error == ERROR_IO_PENDING) {
IOCompletionIsPending(callback, buf);
} else {
LOG(WARNING) << "WriteFile failed: " << error.os_error;
}
return error.result;
}
IOCompletionIsPending(callback, buf);
return ERR_IO_PENDING;
}
void FileStream::Context::OnAsyncFileOpened() {
base::MessageLoopForIO::current()->RegisterIOHandler(file_.GetPlatformFile(),
this);
}
FileStream::Context::IOResult FileStream::Context::SeekFileImpl(Whence whence,
int64 offset) {
LARGE_INTEGER distance, res;
distance.QuadPart = offset;
DWORD move_method = static_cast<DWORD>(whence);
if (SetFilePointerEx(file_.GetPlatformFile(), distance, &res, move_method)) {
SetOffset(&io_context_.overlapped, res);
return IOResult(res.QuadPart, 0);
}
return IOResult::FromOSError(GetLastError());
}
FileStream::Context::IOResult FileStream::Context::FlushFileImpl() {
if (FlushFileBuffers(file_.GetPlatformFile()))
return IOResult(OK, 0);
return IOResult::FromOSError(GetLastError());
}
void FileStream::Context::IOCompletionIsPending(
const CompletionCallback& callback,
IOBuffer* buf) {
DCHECK(callback_.is_null());
callback_ = callback;
in_flight_buf_ = buf; // Hold until the async operation ends.
async_in_progress_ = true;
}
void FileStream::Context::OnIOCompleted(
base::MessageLoopForIO::IOContext* context,
DWORD bytes_read,
DWORD error) {
DCHECK_EQ(&io_context_, context);
DCHECK(!callback_.is_null());
DCHECK(async_in_progress_);
async_in_progress_ = false;
if (orphaned_) {
callback_.Reset();
in_flight_buf_ = NULL;
CloseAndDelete();
return;
}
int result;
if (error == ERROR_HANDLE_EOF) {
result = 0;
} else if (error) {
IOResult error_result = IOResult::FromOSError(error);
result = error_result.result;
} else {
result = bytes_read;
IncrementOffset(&io_context_.overlapped, bytes_read);
}
CompletionCallback temp_callback = callback_;
callback_.Reset();
scoped_refptr<IOBuffer> temp_buf = in_flight_buf_;
in_flight_buf_ = NULL;
temp_callback.Run(result);
}
} // namespace net
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