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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 "chrome/browser/media_galleries/fileapi/mtp_file_stream_reader.h"
#include <algorithm>
#include "base/numerics/safe_conversions.h"
#include "base/platform_file.h"
#include "chrome/browser/media_galleries/fileapi/mtp_device_async_delegate.h"
#include "chrome/browser/media_galleries/fileapi/mtp_device_map_service.h"
#include "chrome/browser/media_galleries/fileapi/native_media_file_util.h"
#include "content/public/browser/browser_thread.h"
#include "net/base/io_buffer.h"
#include "net/base/mime_sniffer.h"
#include "net/base/net_errors.h"
#include "webkit/browser/fileapi/file_system_context.h"
using webkit_blob::FileStreamReader;
namespace {
// Called on the IO thread.
MTPDeviceAsyncDelegate* GetMTPDeviceDelegate(
const fileapi::FileSystemURL& url) {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
return MTPDeviceMapService::GetInstance()->GetMTPDeviceAsyncDelegate(
url.filesystem_id());
}
void CallCompletionCallbackWithPlatformFileError(
const net::CompletionCallback& callback,
base::File::Error file_error) {
callback.Run(net::FileErrorToNetError(file_error));
}
void CallInt64CompletionCallbackWithPlatformFileError(
const net::Int64CompletionCallback& callback,
base::File::Error file_error) {
callback.Run(net::FileErrorToNetError(file_error));
}
void ReadBytes(
const fileapi::FileSystemURL& url, net::IOBuffer* buf, int64 offset,
int buf_len,
const MTPDeviceAsyncDelegate::ReadBytesSuccessCallback& success_callback,
const net::CompletionCallback& error_callback) {
MTPDeviceAsyncDelegate* delegate = GetMTPDeviceDelegate(url);
if (!delegate) {
error_callback.Run(net::ERR_FAILED);
return;
}
delegate->ReadBytes(
url.path(),
make_scoped_refptr(buf),
offset,
buf_len,
success_callback,
base::Bind(&CallCompletionCallbackWithPlatformFileError, error_callback));
}
} // namespace
MTPFileStreamReader::MTPFileStreamReader(
fileapi::FileSystemContext* file_system_context,
const fileapi::FileSystemURL& url,
int64 initial_offset,
const base::Time& expected_modification_time)
: file_system_context_(file_system_context),
url_(url),
current_offset_(initial_offset),
expected_modification_time_(expected_modification_time),
media_header_validated_(false),
weak_factory_(this) {
}
MTPFileStreamReader::~MTPFileStreamReader() {
}
int MTPFileStreamReader::Read(net::IOBuffer* buf, int buf_len,
const net::CompletionCallback& callback) {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
MTPDeviceAsyncDelegate* delegate = GetMTPDeviceDelegate(url_);
if (!delegate)
return net::ERR_FAILED;
if (!media_header_validated_) {
scoped_refptr<net::IOBuffer> header_buf;
int header_buf_len = 0;
if (current_offset_ == 0 && buf_len >= net::kMaxBytesToSniff) {
// If requested read includes all the header bytes, we read directly to
// the original buffer, and validate the header bytes within that.
header_buf = buf;
header_buf_len = buf_len;
} else {
// Otherwise, make a special request for the header.
header_buf = new net::IOBuffer(net::kMaxBytesToSniff);
header_buf_len = net::kMaxBytesToSniff;
}
ReadBytes(url_, header_buf, 0, header_buf_len,
base::Bind(&MTPFileStreamReader::FinishValidateMediaHeader,
weak_factory_.GetWeakPtr(), header_buf,
make_scoped_refptr(buf), buf_len, callback),
callback);
return net::ERR_IO_PENDING;
}
ReadBytes(url_, buf, current_offset_, buf_len,
base::Bind(&MTPFileStreamReader::FinishRead,
weak_factory_.GetWeakPtr(), callback),
callback);
return net::ERR_IO_PENDING;
}
int64 MTPFileStreamReader::GetLength(
const net::Int64CompletionCallback& callback) {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
MTPDeviceAsyncDelegate* delegate = GetMTPDeviceDelegate(url_);
if (!delegate)
return net::ERR_FAILED;
delegate->GetFileInfo(
url_.path(),
base::Bind(&MTPFileStreamReader::FinishGetLength,
weak_factory_.GetWeakPtr(), callback),
base::Bind(&CallInt64CompletionCallbackWithPlatformFileError,
callback));
return net::ERR_IO_PENDING;
}
void MTPFileStreamReader::FinishValidateMediaHeader(
net::IOBuffer* header_buf,
net::IOBuffer* buf, int buf_len,
const net::CompletionCallback& callback,
const base::File::Info& file_info,
int header_bytes_read) {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
DCHECK_GE(header_bytes_read, 0);
base::File::Error error = NativeMediaFileUtil::BufferIsMediaHeader(
header_buf, header_bytes_read);
if (error != base::File::FILE_OK) {
CallCompletionCallbackWithPlatformFileError(callback, error);
return;
}
media_header_validated_ = true;
// Finish the read immediately if we've already finished reading into the
// originally requested buffer.
if (header_buf == buf)
return FinishRead(callback, file_info, header_bytes_read);
// Header buffer isn't the same as the original read buffer. Make a separate
// request for that.
ReadBytes(url_, buf, current_offset_, buf_len,
base::Bind(&MTPFileStreamReader::FinishRead,
weak_factory_.GetWeakPtr(), callback),
callback);
}
void MTPFileStreamReader::FinishRead(const net::CompletionCallback& callback,
const base::File::Info& file_info,
int bytes_read) {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
if (!VerifySnapshotTime(expected_modification_time_, file_info)) {
callback.Run(net::ERR_UPLOAD_FILE_CHANGED);
return;
}
DCHECK_GE(bytes_read, 0);
current_offset_ += bytes_read;
callback.Run(bytes_read);
}
void MTPFileStreamReader::FinishGetLength(
const net::Int64CompletionCallback& callback,
const base::File::Info& file_info) {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
if (!VerifySnapshotTime(expected_modification_time_, file_info)) {
callback.Run(net::ERR_UPLOAD_FILE_CHANGED);
return;
}
callback.Run(file_info.size);
}
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