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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/utility/media_galleries/ipc_data_source.h"
#include "base/message_loop/message_loop_proxy.h"
#include "chrome/common/extensions/chrome_utility_extensions_messages.h"
#include "content/public/utility/utility_thread.h"
namespace metadata {
IPCDataSource::IPCDataSource(int64 total_size)
: total_size_(total_size),
utility_task_runner_(base::MessageLoopProxy::current()),
next_request_id_(0) {
data_source_thread_checker_.DetachFromThread();
}
IPCDataSource::~IPCDataSource() {
DCHECK(utility_thread_checker_.CalledOnValidThread());
}
void IPCDataSource::Stop(const base::Closure& callback) {
DCHECK(data_source_thread_checker_.CalledOnValidThread());
callback.Run();
}
void IPCDataSource::Read(int64 position, int size, uint8* data,
const DataSource::ReadCB& read_cb) {
DCHECK(data_source_thread_checker_.CalledOnValidThread());
utility_task_runner_->PostTask(
FROM_HERE,
base::Bind(&IPCDataSource::ReadOnUtilityThread, base::Unretained(this),
position, size, data, read_cb));
}
bool IPCDataSource::GetSize(int64* size_out) {
DCHECK(data_source_thread_checker_.CalledOnValidThread());
*size_out = total_size_;
return true;
}
bool IPCDataSource::IsStreaming() {
DCHECK(data_source_thread_checker_.CalledOnValidThread());
return false;
}
void IPCDataSource::SetBitrate(int bitrate) {
DCHECK(data_source_thread_checker_.CalledOnValidThread());
}
bool IPCDataSource::OnMessageReceived(const IPC::Message& message) {
DCHECK(utility_thread_checker_.CalledOnValidThread());
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(IPCDataSource, message)
IPC_MESSAGE_HANDLER(ChromeUtilityMsg_RequestBlobBytes_Finished,
OnRequestBlobBytesFinished)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP()
return handled;
}
IPCDataSource::Request::Request()
: destination(NULL) {
}
IPCDataSource::Request::~Request() {
}
void IPCDataSource::ReadOnUtilityThread(int64 position, int size, uint8* data,
const DataSource::ReadCB& read_cb) {
DCHECK(utility_thread_checker_.CalledOnValidThread());
CHECK_GE(total_size_, 0);
CHECK_GE(position, 0);
CHECK_GE(size, 0);
// Cap position and size within bounds.
position = std::min(position, total_size_);
int64 clamped_size =
std::min(static_cast<int64>(size), total_size_ - position);
int64 request_id = ++next_request_id_;
Request request;
request.destination = data;
request.callback = read_cb;
pending_requests_[request_id] = request;
content::UtilityThread::Get()->Send(new ChromeUtilityHostMsg_RequestBlobBytes(
request_id, position, clamped_size));
}
void IPCDataSource::OnRequestBlobBytesFinished(int64 request_id,
const std::string& bytes) {
DCHECK(utility_thread_checker_.CalledOnValidThread());
std::map<int64, Request>::iterator it = pending_requests_.find(request_id);
if (it == pending_requests_.end())
return;
std::copy(bytes.begin(), bytes.end(), it->second.destination);
it->second.callback.Run(bytes.size());
pending_requests_.erase(it);
}
} // namespace metadata
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