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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 "webkit/blob/local_file_stream_reader.h"
#include "base/file_util.h"
#include "base/file_util_proxy.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/platform_file.h"
#include "base/task_runner.h"
#include "net/base/file_stream.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
namespace webkit_blob {
namespace {
const int kOpenFlagsForRead = base::PLATFORM_FILE_OPEN |
base::PLATFORM_FILE_READ |
base::PLATFORM_FILE_ASYNC;
// Verify if the underlying file has not been modified.
bool VerifySnapshotTime(const base::Time& expected_modification_time,
const base::PlatformFileInfo& file_info) {
return expected_modification_time.is_null() ||
expected_modification_time.ToTimeT() ==
file_info.last_modified.ToTimeT();
}
} // namespace
LocalFileStreamReader::LocalFileStreamReader(
base::TaskRunner* task_runner,
const FilePath& file_path,
int64 initial_offset,
const base::Time& expected_modification_time)
: task_runner_(task_runner),
file_path_(file_path),
initial_offset_(initial_offset),
expected_modification_time_(expected_modification_time),
has_pending_open_(false),
weak_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {}
LocalFileStreamReader::~LocalFileStreamReader() {
}
int LocalFileStreamReader::Read(net::IOBuffer* buf, int buf_len,
const net::CompletionCallback& callback) {
DCHECK(!has_pending_open_);
if (stream_impl_.get())
return stream_impl_->Read(buf, buf_len, callback);
return Open(base::Bind(&LocalFileStreamReader::DidOpenForRead,
weak_factory_.GetWeakPtr(),
make_scoped_refptr(buf), buf_len, callback));
}
int LocalFileStreamReader::GetLength(
const net::Int64CompletionCallback& callback) {
const bool posted = base::FileUtilProxy::GetFileInfo(
task_runner_, file_path_,
base::Bind(&LocalFileStreamReader::DidGetFileInfoForGetLength,
weak_factory_.GetWeakPtr(), callback));
DCHECK(posted);
return net::ERR_IO_PENDING;
}
int LocalFileStreamReader::Open(const net::CompletionCallback& callback) {
DCHECK(!has_pending_open_);
DCHECK(!stream_impl_.get());
has_pending_open_ = true;
// Call GetLength first to make it perform last-modified-time verification,
// and then call DidVerifyForOpen for do the rest.
return GetLength(base::Bind(&LocalFileStreamReader::DidVerifyForOpen,
weak_factory_.GetWeakPtr(), callback));
}
void LocalFileStreamReader::DidVerifyForOpen(
const net::CompletionCallback& callback,
int64 get_length_result) {
if (get_length_result < 0) {
callback.Run(static_cast<int>(get_length_result));
return;
}
stream_impl_.reset(new net::FileStream(NULL));
const int result = stream_impl_->Open(
file_path_, kOpenFlagsForRead,
base::Bind(&LocalFileStreamReader::DidOpenFileStream,
weak_factory_.GetWeakPtr(),
callback));
if (result != net::ERR_IO_PENDING)
callback.Run(result);
}
void LocalFileStreamReader::DidOpenFileStream(
const net::CompletionCallback& callback,
int result) {
if (result != net::OK) {
callback.Run(result);
return;
}
result = stream_impl_->Seek(
net::FROM_BEGIN, initial_offset_,
base::Bind(&LocalFileStreamReader::DidSeekFileStream,
weak_factory_.GetWeakPtr(),
callback));
if (result != net::ERR_IO_PENDING) {
callback.Run(result);
}
}
void LocalFileStreamReader::DidSeekFileStream(
const net::CompletionCallback& callback,
int64 seek_result) {
if (seek_result < 0) {
callback.Run(static_cast<int>(seek_result));
return;
}
if (seek_result != initial_offset_) {
callback.Run(net::ERR_REQUEST_RANGE_NOT_SATISFIABLE);
return;
}
callback.Run(net::OK);
}
void LocalFileStreamReader::DidOpenForRead(
net::IOBuffer* buf,
int buf_len,
const net::CompletionCallback& callback,
int open_result) {
DCHECK(has_pending_open_);
has_pending_open_ = false;
if (open_result != net::OK) {
stream_impl_.reset();
callback.Run(open_result);
return;
}
DCHECK(stream_impl_.get());
const int read_result = stream_impl_->Read(buf, buf_len, callback);
if (read_result != net::ERR_IO_PENDING)
callback.Run(read_result);
}
void LocalFileStreamReader::DidGetFileInfoForGetLength(
const net::Int64CompletionCallback& callback,
base::PlatformFileError error,
const base::PlatformFileInfo& file_info) {
if (file_info.is_directory) {
callback.Run(net::ERR_FILE_NOT_FOUND);
return;
}
if (error != base::PLATFORM_FILE_OK) {
callback.Run(net::PlatformFileErrorToNetError(error));
return;
}
if (!VerifySnapshotTime(expected_modification_time_, file_info)) {
callback.Run(net::ERR_UPLOAD_FILE_CHANGED);
return;
}
callback.Run(file_info.size);
}
} // namespace webkit_blob
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