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// Copyright 2018 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.
#ifndef PDF_DOCUMENT_LOADER_IMPL_H_
#define PDF_DOCUMENT_LOADER_IMPL_H_
#include <memory>
#include <string>
#include "base/macros.h"
#include "pdf/chunk_stream.h"
#include "pdf/document_loader.h"
#include "ppapi/utility/completion_callback_factory.h"
namespace chrome_pdf {
class DocumentLoaderImpl : public DocumentLoader {
public:
// Number was chosen in https://crbug.com/78264#c8
static constexpr uint32_t kDefaultRequestSize = 65536;
explicit DocumentLoaderImpl(Client* client);
~DocumentLoaderImpl() override;
// DocumentLoader:
bool Init(std::unique_ptr<URLLoaderWrapper> loader,
const std::string& url) override;
bool GetBlock(uint32_t position, uint32_t size, void* buf) const override;
bool IsDataAvailable(uint32_t position, uint32_t size) const override;
void RequestData(uint32_t position, uint32_t size) override;
bool IsDocumentComplete() const override;
void SetDocumentSize(uint32_t size) override;
uint32_t GetDocumentSize() const override;
uint32_t BytesReceived() const override;
void ClearPendingRequests() override;
// Exposed for unit tests.
void SetPartialLoadingEnabled(bool enabled);
bool is_partial_loader_active() const { return is_partial_loader_active_; }
private:
using DataStream = ChunkStream<kDefaultRequestSize>;
struct Chunk {
Chunk();
~Chunk();
void Clear();
uint32_t chunk_index = 0;
uint32_t data_size = 0;
std::unique_ptr<DataStream::ChunkData> chunk_data;
};
// Called by the completion callback of the document's URLLoader.
void DidOpenPartial(int32_t result);
// Call to read data from the document's URLLoader.
void ReadMore();
// Called by the completion callback of the document's URLLoader.
void DidRead(int32_t result);
bool ShouldCancelLoading() const;
void ContinueDownload();
// Called when we complete server request.
void ReadComplete();
bool SaveBuffer(char* input, uint32_t input_size);
void SaveChunkData();
uint32_t EndOfCurrentChunk() const;
Client* const client_;
std::string url_;
std::unique_ptr<URLLoaderWrapper> loader_;
pp::CompletionCallbackFactory<DocumentLoaderImpl> loader_factory_;
DataStream chunk_stream_;
bool partial_loading_enabled_ = true;
bool is_partial_loader_active_ = false;
static constexpr uint32_t kReadBufferSize = 256 * 1024;
char buffer_[kReadBufferSize];
// The current chunk DocumentLoader is working with.
Chunk chunk_;
// In units of Chunks.
RangeSet pending_requests_;
uint32_t bytes_received_ = 0;
DISALLOW_COPY_AND_ASSIGN(DocumentLoaderImpl);
};
} // namespace chrome_pdf
#endif // PDF_DOCUMENT_LOADER_IMPL_H_
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