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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ash/arc/fileapi/arc_documents_provider_file_stream_reader.h"
#include <utility>
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "chrome/browser/ash/arc/fileapi/arc_content_file_system_file_stream_reader.h"
#include "chrome/browser/ash/arc/fileapi/arc_documents_provider_file_system_url_util.h"
#include "content/public/browser/browser_thread.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
#include "storage/browser/file_system/file_system_url.h"
#include "url/gurl.h"
using content::BrowserThread;
namespace arc {
ArcDocumentsProviderFileStreamReader::ArcDocumentsProviderFileStreamReader(
const storage::FileSystemURL& url,
int64_t offset)
: offset_(offset), content_url_resolved_(false) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
ResolveToContentUrlOnIOThread(
url, base::BindOnce(
&ArcDocumentsProviderFileStreamReader::OnResolveToContentUrl,
weak_ptr_factory_.GetWeakPtr()));
}
ArcDocumentsProviderFileStreamReader::~ArcDocumentsProviderFileStreamReader() {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
}
int ArcDocumentsProviderFileStreamReader::Read(
net::IOBuffer* buffer,
int buffer_length,
net::CompletionOnceCallback callback) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
if (!content_url_resolved_) {
pending_operations_.emplace_back(
base::BindOnce(&ArcDocumentsProviderFileStreamReader::RunPendingRead,
base::Unretained(this), base::WrapRefCounted(buffer),
buffer_length, std::move(callback)));
return net::ERR_IO_PENDING;
}
if (!underlying_reader_)
return net::ERR_FILE_NOT_FOUND;
return underlying_reader_->Read(buffer, buffer_length, std::move(callback));
}
int64_t ArcDocumentsProviderFileStreamReader::GetLength(
net::Int64CompletionOnceCallback callback) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
if (!content_url_resolved_) {
pending_operations_.emplace_back(base::BindOnce(
&ArcDocumentsProviderFileStreamReader::RunPendingGetLength,
base::Unretained(this), std::move(callback)));
return net::ERR_IO_PENDING;
}
if (!underlying_reader_)
return net::ERR_FILE_NOT_FOUND;
return underlying_reader_->GetLength(std::move(callback));
}
void ArcDocumentsProviderFileStreamReader::OnResolveToContentUrl(
const GURL& content_url) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
DCHECK(!content_url_resolved_);
if (content_url.is_valid()) {
underlying_reader_ = std::make_unique<ArcContentFileSystemFileStreamReader>(
content_url, offset_);
}
content_url_resolved_ = true;
std::vector<base::OnceClosure> pending_operations;
pending_operations.swap(pending_operations_);
for (base::OnceClosure& callback : pending_operations) {
std::move(callback).Run();
}
}
void ArcDocumentsProviderFileStreamReader::RunPendingRead(
scoped_refptr<net::IOBuffer> buffer,
int buffer_length,
net::CompletionOnceCallback callback) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
DCHECK(content_url_resolved_);
// Create two copies of |callback| though it can still only called at most
// once. This is safe because Read() is guaranteed not to call |callback| if
// it returns synchronously.
auto split_callback = base::SplitOnceCallback(std::move(callback));
int result = underlying_reader_
? underlying_reader_->Read(buffer.get(), buffer_length,
std::move(split_callback.first))
: net::ERR_FILE_NOT_FOUND;
if (result != net::ERR_IO_PENDING)
std::move(split_callback.second).Run(result);
}
void ArcDocumentsProviderFileStreamReader::RunPendingGetLength(
net::Int64CompletionOnceCallback callback) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
DCHECK(content_url_resolved_);
// Create two copies of |callback| though it can still only called at most
// once. This is safe because GetLength() is guaranteed not to call |callback|
// if it returns synchronously.
auto split_callback = base::SplitOnceCallback(std::move(callback));
int64_t result =
underlying_reader_
? underlying_reader_->GetLength(std::move(split_callback.first))
: net::ERR_FILE_NOT_FOUND;
if (result != net::ERR_IO_PENDING)
std::move(split_callback.second).Run(result);
}
} // namespace arc
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