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// Copyright 2015 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef COBALT_LOADER_TEXT_DECODER_H_
#define COBALT_LOADER_TEXT_DECODER_H_
#include <algorithm>
#include <memory>
#include <string>
#include <utility>
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/logging.h"
#include "base/threading/thread_checker.h"
#include "cobalt/dom/url_utils.h"
#include "cobalt/loader/decoder.h"
namespace cobalt {
namespace loader {
// TextDecoder converts chunks of data into std::string and concatenate the
// results.
class TextDecoder : public Decoder {
public:
typedef base::Callback<void(const loader::Origin&,
std::unique_ptr<std::string>)>
TextAvailableCallback;
~TextDecoder() override {}
// This function is used for binding callback for creating TextDecoder.
static std::unique_ptr<Decoder> Create(
const TextAvailableCallback& text_available_callback,
const loader::Decoder::OnCompleteFunction& load_complete_callback =
loader::Decoder::OnCompleteFunction()) {
return std::unique_ptr<Decoder>(
new TextDecoder(text_available_callback, load_complete_callback));
}
// From Decoder.
void DecodeChunk(const char* data, size_t size) override {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
if (suspended_) {
return;
}
if (!text_) {
text_.reset(new std::string);
}
text_->append(data, size);
}
void DecodeChunkPassed(std::unique_ptr<std::string> data) override {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
DCHECK(data);
if (suspended_) {
return;
}
if (!text_) {
text_ = std::move(data);
} else {
text_->append(*data);
}
}
void Finish() override {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
if (suspended_) return;
if (!text_) text_.reset(new std::string);
text_available_callback_.Run(last_url_origin_, std::move(text_));
if (!load_complete_callback_.is_null()) {
load_complete_callback_.Run(base::nullopt);
}
}
bool Suspend() override {
suspended_ = true;
text_.reset();
return true;
}
void Resume(render_tree::ResourceProvider* resource_provider) override {
suspended_ = false;
}
void SetLastURLOrigin(const loader::Origin& last_url_origin) override {
last_url_origin_ = last_url_origin;
}
private:
explicit TextDecoder(
const TextAvailableCallback& text_available_callback,
const loader::Decoder::OnCompleteFunction& load_complete_callback)
: text_available_callback_(text_available_callback),
load_complete_callback_(load_complete_callback),
suspended_(false) {}
THREAD_CHECKER(thread_checker_);
TextAvailableCallback text_available_callback_;
loader::Decoder::OnCompleteFunction load_complete_callback_;
loader::Origin last_url_origin_;
std::unique_ptr<std::string> text_;
bool suspended_;
};
} // namespace loader
} // namespace cobalt
#endif // COBALT_LOADER_TEXT_DECODER_H_