| // Copyright 2015 Google Inc. 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 <string> |
| |
| #include "base/callback.h" |
| #include "base/compiler_specific.h" |
| #include "base/logging.h" |
| #include "base/memory/scoped_ptr.h" |
| #include "base/threading/thread_checker.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: |
| explicit TextDecoder(base::Callback<void(const std::string&)> done_callback) |
| : done_callback_(done_callback), suspended_(false) {} |
| ~TextDecoder() OVERRIDE {} |
| |
| // This function is used for binding callback for creating TextDecoder. |
| static scoped_ptr<Decoder> Create( |
| base::Callback<void(const std::string&)> done_callback) { |
| return scoped_ptr<Decoder>(new TextDecoder(done_callback)); |
| } |
| |
| // From Decoder. |
| void DecodeChunk(const char* data, size_t size) OVERRIDE { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| if (suspended_) { |
| return; |
| } |
| text_.append(data, size); |
| } |
| |
| void DecodeChunkPassed(scoped_ptr<std::string> data) OVERRIDE { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| DCHECK(data); |
| if (suspended_) { |
| return; |
| } |
| |
| if (text_.empty()) { |
| std::swap(*data, text_); |
| } else { |
| text_.append(*data); |
| } |
| } |
| |
| void Finish() OVERRIDE { |
| DCHECK(thread_checker_.CalledOnValidThread()); |
| if (suspended_) { |
| return; |
| } |
| done_callback_.Run(text_); |
| } |
| bool Suspend() OVERRIDE { |
| suspended_ = true; |
| text_.clear(); |
| return true; |
| } |
| void Resume(render_tree::ResourceProvider* /*resource_provider*/) OVERRIDE { |
| suspended_ = false; |
| } |
| |
| private: |
| base::ThreadChecker thread_checker_; |
| std::string text_; |
| base::Callback<void(const std::string&)> done_callback_; |
| bool suspended_; |
| }; |
| |
| } // namespace loader |
| } // namespace cobalt |
| |
| #endif // COBALT_LOADER_TEXT_DECODER_H_ |