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// Copyright (c) 2013 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/fileapi/upload_file_system_file_element_reader.h"
#include "base/bind.h"
#include "net/base/net_errors.h"
#include "webkit/blob/file_stream_reader.h"
#include "webkit/fileapi/file_system_context.h"
#include "webkit/fileapi/file_system_url.h"
namespace fileapi {
UploadFileSystemFileElementReader::UploadFileSystemFileElementReader(
FileSystemContext* file_system_context,
const GURL& url,
uint64 range_offset,
uint64 range_length,
const base::Time& expected_modification_time)
: file_system_context_(file_system_context),
url_(url),
range_offset_(range_offset),
range_length_(range_length),
expected_modification_time_(expected_modification_time),
stream_length_(0),
position_(0),
weak_ptr_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {
}
UploadFileSystemFileElementReader::~UploadFileSystemFileElementReader() {
}
int UploadFileSystemFileElementReader::Init(
const net::CompletionCallback& callback) {
// Reset states.
weak_ptr_factory_.InvalidateWeakPtrs();
stream_length_ = 0;
position_ = 0;
// Initialize the stream reader and the length.
stream_reader_.reset(
file_system_context_->CreateFileStreamReader(
file_system_context_->CrackURL(url_),
range_offset_,
expected_modification_time_));
DCHECK(stream_reader_);
const int result = stream_reader_->GetLength(
base::Bind(&UploadFileSystemFileElementReader::OnGetLength,
weak_ptr_factory_.GetWeakPtr(),
callback));
if (result >= 0) {
stream_length_ = result;
return net::OK;
}
return result;
}
uint64 UploadFileSystemFileElementReader::GetContentLength() const {
return std::min(stream_length_, range_length_);
}
uint64 UploadFileSystemFileElementReader::BytesRemaining() const {
return GetContentLength() - position_;
}
int UploadFileSystemFileElementReader::Read(
net::IOBuffer* buf,
int buf_length,
const net::CompletionCallback& callback) {
DCHECK_LT(0, buf_length);
DCHECK(stream_reader_);
const uint64 num_bytes_to_read =
std::min(BytesRemaining(), static_cast<uint64>(buf_length));
if (num_bytes_to_read == 0)
return 0;
const int result = stream_reader_->Read(
buf, num_bytes_to_read,
base::Bind(&UploadFileSystemFileElementReader::OnRead,
weak_ptr_factory_.GetWeakPtr(),
callback));
if (result >= 0)
OnRead(net::CompletionCallback(), result);
return result;
}
void UploadFileSystemFileElementReader::OnGetLength(
const net::CompletionCallback& callback,
int64 result) {
if (result >= 0) {
stream_length_ = result;
callback.Run(net::OK);
return;
}
callback.Run(result);
}
void UploadFileSystemFileElementReader::OnRead(
const net::CompletionCallback& callback,
int result) {
if (result > 0) {
position_ += result;
DCHECK_LE(position_, GetContentLength());
}
if (!callback.is_null())
callback.Run(result);
}
} // namespace fileapi
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