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/*
* Compression Transform
* (C) 2014 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_COMPRESSION_TRANSFORM_H__
#define BOTAN_COMPRESSION_TRANSFORM_H__
#include <botan/transform.h>
namespace Botan {
class BOTAN_DLL Compressor_Transformation : public Transformation
{
public:
size_t update_granularity() const override { return 1; }
size_t minimum_final_size() const override { return 0; }
size_t default_nonce_length() const override { return 0; }
bool valid_nonce_length(size_t nonce_len) const override
{ return nonce_len == 0; }
virtual void flush(secure_vector<byte>& buf, size_t offset = 0) { update(buf, offset); }
size_t output_length(size_t) const override
{
throw std::runtime_error(name() + " output length indeterminate");
}
};
class Compression_Stream
{
public:
virtual ~Compression_Stream() {}
virtual void next_in(byte* b, size_t len) = 0;
virtual void next_out(byte* b, size_t len) = 0;
virtual size_t avail_in() const = 0;
virtual size_t avail_out() const = 0;
virtual u32bit run_flag() const = 0;
virtual u32bit flush_flag() const = 0;
virtual u32bit finish_flag() const = 0;
virtual bool run(u32bit flags) = 0;
};
class BOTAN_DLL Stream_Compression : public Compressor_Transformation
{
public:
void update(secure_vector<byte>& buf, size_t offset = 0) override;
void flush(secure_vector<byte>& buf, size_t offset = 0) override;
void finish(secure_vector<byte>& buf, size_t offset = 0) override;
void clear() override;
private:
secure_vector<byte> start_raw(const byte[], size_t) override;
void process(secure_vector<byte>& buf, size_t offset, u32bit flags);
virtual Compression_Stream* make_stream() const = 0;
secure_vector<byte> m_buffer;
std::unique_ptr<Compression_Stream> m_stream;
};
class BOTAN_DLL Stream_Decompression : public Compressor_Transformation
{
public:
void update(secure_vector<byte>& buf, size_t offset = 0) override;
void finish(secure_vector<byte>& buf, size_t offset = 0) override;
void clear() override;
private:
secure_vector<byte> start_raw(const byte[], size_t) override;
void process(secure_vector<byte>& buf, size_t offset, u32bit flags);
virtual Compression_Stream* make_stream() const = 0;
secure_vector<byte> m_buffer;
std::unique_ptr<Compression_Stream> m_stream;
};
}
#endif
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