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// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#ifndef BIN_FILTER_H_
#define BIN_FILTER_H_
#include "bin/builtin.h"
#include "bin/utils.h"
#include "../third_party/zlib/zlib.h"
namespace dart {
namespace bin {
class Filter {
public:
virtual ~Filter() {}
virtual bool Init() = 0;
/**
* On a succesfull call to Process, Process will take ownership of data. On
* successive calls to either Processed or ~Filter, data will be freed with
* a delete[] call.
*/
virtual bool Process(uint8_t* data, intptr_t length) = 0;
virtual intptr_t Processed(uint8_t* buffer, intptr_t length, bool finish) = 0;
static Dart_Handle SetFilterPointerNativeField(Dart_Handle filter,
Filter* filter_pointer);
static Dart_Handle GetFilterPointerNativeField(Dart_Handle filter,
Filter** filter_pointer);
bool initialized() const { return initialized_; }
void set_initialized(bool value) { initialized_ = value; }
uint8_t* processed_buffer() { return processed_buffer_; }
intptr_t processed_buffer_size() const { return kFilterBufferSize; }
protected:
Filter() : initialized_(false) {}
private:
static const intptr_t kFilterBufferSize = 64 * KB;
uint8_t processed_buffer_[kFilterBufferSize];
bool initialized_;
DISALLOW_COPY_AND_ASSIGN(Filter);
};
class ZLibDeflateFilter : public Filter {
public:
ZLibDeflateFilter(bool gzip = false, int level = 6)
: gzip_(gzip), level_(level), current_buffer_(NULL) {}
virtual ~ZLibDeflateFilter();
virtual bool Init();
virtual bool Process(uint8_t* data, intptr_t length);
virtual intptr_t Processed(uint8_t* buffer, intptr_t length, bool finish);
private:
const bool gzip_;
const int level_;
uint8_t* current_buffer_;
z_stream stream_;
DISALLOW_COPY_AND_ASSIGN(ZLibDeflateFilter);
};
class ZLibInflateFilter : public Filter {
public:
ZLibInflateFilter() : current_buffer_(NULL) {}
virtual ~ZLibInflateFilter();
virtual bool Init();
virtual bool Process(uint8_t* data, intptr_t length);
virtual intptr_t Processed(uint8_t* buffer, intptr_t length, bool finish);
private:
uint8_t* current_buffer_;
z_stream stream_;
DISALLOW_COPY_AND_ASSIGN(ZLibInflateFilter);
};
} // namespace bin
} // namespace dart
#endif // BIN_FILTER_H_