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/*************************************************************************************************
* Data compressor and decompressor
* Copyright (C) 2009-2012 FAL Labs
* This file is part of Kyoto Cabinet.
* This program is free software: you can redistribute it and/or modify it under the terms of
* the GNU General Public License as published by the Free Software Foundation, either version
* 3 of the License, or any later version.
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
* You should have received a copy of the GNU General Public License along with this program.
* If not, see <http://www.gnu.org/licenses/>.
*************************************************************************************************/
#ifndef _KCCOMPRESS_H // duplication check
#define _KCCOMPRESS_H
#include <kccommon.h>
#include <kcutil.h>
#include <kcthread.h>
namespace kyotocabinet { // common namespace
/**
* Interfrace of data compression and decompression.
*/
class Compressor {
public:
/**
* Destructor.
*/
virtual ~Compressor() {}
/**
* Compress a serial data.
* @param buf the input buffer.
* @param size the size of the input buffer.
* @param sp the pointer to the variable into which the size of the region of the return
* value is assigned.
* @return the pointer to the result data, or NULL on failure.
* @note Because the region of the return value is allocated with the the new[] operator, it
* should be released with the delete[] operator when it is no longer in use.
*/
virtual char* compress(const void* buf, size_t size, size_t* sp) = 0;
/**
* Decompress a serial data.
* @param buf the input buffer.
* @param size the size of the input buffer.
* @param sp the pointer to the variable into which the size of the region of the return
* value is assigned.
* @return the pointer to the result data, or NULL on failure.
* @note Because an additional zero code is appended at the end of the region of the return
* value, the return value can be treated as a C-style string. Because the region of the
* return value is allocated with the the new[] operator, it should be released with the
* delete[] operator when it is no longer in use.
*/
virtual char* decompress(const void* buf, size_t size, size_t* sp) = 0;
};
/**
* ZLIB compressor.
*/
class ZLIB {
public:
/**
* Compression modes.
*/
enum Mode {
RAW, ///< without any checksum
DEFLATE, ///< with Adler32 checksum
GZIP ///< with CRC32 checksum and various meta data
};
/**
* Compress a serial data.
* @param buf the input buffer.
* @param size the size of the input buffer.
* @param sp the pointer to the variable into which the size of the region of the return
* value is assigned.
* @param mode the compression mode.
* @return the pointer to the result data, or NULL on failure.
* @note Because the region of the return value is allocated with the the new[] operator, it
* should be released with the delete[] operator when it is no longer in use.
*/
static char* compress(const void* buf, size_t size, size_t* sp, Mode mode = RAW);
/**
* Decompress a serial data.
* @param buf the input buffer.
* @param size the size of the input buffer.
* @param sp the pointer to the variable into which the size of the region of the return
* value is assigned.
* @param mode the compression mode.
* @return the pointer to the result data, or NULL on failure.
* @note Because an additional zero code is appended at the end of the region of the return
* value, the return value can be treated as a C-style string. Because the region of the
* return value is allocated with the the new[] operator, it should be released with the
* delete[] operator when it is no longer in use.
*/
static char* decompress(const void* buf, size_t size, size_t* sp, Mode mode = RAW);
/**
* Calculate the CRC32 checksum of a serial data.
* @param buf the input buffer.
* @param size the size of the input buffer.
* @param seed the cyclic seed value.
* @return the CRC32 checksum.
*/
static uint32_t calculate_crc(const void* buf, size_t size, uint32_t seed = 0);
};
/**
* LZO compressor.
*/
class LZO {
public:
/**
* Compression modes.
*/
enum Mode {
RAW, ///< without any checksum
CRC ///< with CRC32 checksum
};
/**
* Compress a serial data.
* @param buf the input buffer.
* @param size the size of the input buffer.
* @param sp the pointer to the variable into which the size of the region of the return
* value is assigned.
* @param mode the compression mode.
* @return the pointer to the result data, or NULL on failure.
* @note Because the region of the return value is allocated with the the new[] operator, it
* should be released with the delete[] operator when it is no longer in use.
*/
static char* compress(const void* buf, size_t size, size_t* sp, Mode mode = RAW);
/**
* Decompress a serial data.
* @param buf the input buffer.
* @param size the size of the input buffer.
* @param sp the pointer to the variable into which the size of the region of the return
* value is assigned.
* @param mode the compression mode.
* @return the pointer to the result data, or NULL on failure.
* @note Because an additional zero code is appended at the end of the region of the return
* value, the return value can be treated as a C-style string. Because the region of the
* return value is allocated with the the new[] operator, it should be released with the
* delete[] operator when it is no longer in use.
*/
static char* decompress(const void* buf, size_t size, size_t* sp, Mode mode = RAW);
/**
* Calculate the CRC32 checksum of a serial data.
* @param buf the input buffer.
* @param size the size of the input buffer.
* @param seed the cyclic seed value.
* @return the CRC32 checksum.
*/
static uint32_t calculate_crc(const void* buf, size_t size, uint32_t seed = 0);
};
/**
* LZMA compressor.
*/
class LZMA {
public:
/**
* Compression modes.
*/
enum Mode {
RAW, ///< without any checksum
CRC, ///< with CRC32 checksum
SHA ///< with SHA256 checksum
};
/**
* Compress a serial data.
* @param buf the input buffer.
* @param size the size of the input buffer.
* @param sp the pointer to the variable into which the size of the region of the return
* value is assigned.
* @param mode the compression mode.
* @return the pointer to the result data, or NULL on failure.
* @note Because the region of the return value is allocated with the the new[] operator, it
* should be released with the delete[] operator when it is no longer in use.
*/
static char* compress(const void* buf, size_t size, size_t* sp, Mode mode = RAW);
/**
* Decompress a serial data.
* @param buf the input buffer.
* @param size the size of the input buffer.
* @param sp the pointer to the variable into which the size of the region of the return
* value is assigned.
* @param mode the compression mode.
* @return the pointer to the result data, or NULL on failure.
* @note Because an additional zero code is appended at the end of the region of the return
* value, the return value can be treated as a C-style string. Because the region of the
* return value is allocated with the the new[] operator, it should be released with the
* delete[] operator when it is no longer in use.
*/
static char* decompress(const void* buf, size_t size, size_t* sp, Mode mode = RAW);
/**
* Calculate the CRC32 checksum of a serial data.
* @param buf the input buffer.
* @param size the size of the input buffer.
* @param seed the cyclic seed value.
* @return the CRC32 checksum.
*/
static uint32_t calculate_crc(const void* buf, size_t size, uint32_t seed = 0);
};
/**
* Compressor with ZLIB.
*/
template <ZLIB::Mode MODE>
class ZLIBCompressor : public Compressor {
private:
/**
* Compress a serial data.
*/
char* compress(const void* buf, size_t size, size_t* sp) {
_assert_(buf && size <= MEMMAXSIZ && sp);
return ZLIB::compress(buf, size, sp, MODE);
}
/**
* Decompress a serial data.
*/
char* decompress(const void* buf, size_t size, size_t* sp) {
_assert_(buf && size <= MEMMAXSIZ && sp);
return ZLIB::decompress(buf, size, sp, MODE);
}
};
/**
* Compressor with LZO.
*/
template <LZO::Mode MODE>
class LZOCompressor : public Compressor {
private:
/**
* Compress a serial data.
*/
char* compress(const void* buf, size_t size, size_t* sp) {
_assert_(buf && size <= MEMMAXSIZ && sp);
return LZO::compress(buf, size, sp, MODE);
}
/**
* Decompress a serial data.
*/
char* decompress(const void* buf, size_t size, size_t* sp) {
_assert_(buf && size <= MEMMAXSIZ && sp);
return LZO::decompress(buf, size, sp, MODE);
}
};
/**
* Compressor with LZMA.
*/
template <LZMA::Mode MODE>
class LZMACompressor : public Compressor {
private:
/**
* Compress a serial data.
*/
char* compress(const void* buf, size_t size, size_t* sp) {
_assert_(buf && size <= MEMMAXSIZ && sp);
return LZMA::compress(buf, size, sp, MODE);
}
/**
* Decompress a serial data.
*/
char* decompress(const void* buf, size_t size, size_t* sp) {
_assert_(buf && size <= MEMMAXSIZ && sp);
return LZMA::decompress(buf, size, sp, MODE);
}
};
/**
* Compressor with the Arcfour cipher.
*/
class ArcfourCompressor : public Compressor {
public:
/**
* Constructor.
*/
ArcfourCompressor() : kbuf_(NULL), ksiz_(0), comp_(NULL), salt_(0), cycle_(false) {
_assert_(true);
kbuf_ = new char[1];
ksiz_ = 0;
}
/**
* Destructor.
*/
~ArcfourCompressor() {
_assert_(true);
delete[] kbuf_;
}
/**
* Set the cipher key.
* @param kbuf the pointer to the region of the cipher key.
* @param ksiz the size of the region of the cipher key.
*/
void set_key(const void* kbuf, size_t ksiz) {
_assert_(kbuf && ksiz <= MEMMAXSIZ);
delete[] kbuf_;
if (ksiz > NUMBUFSIZ) ksiz = NUMBUFSIZ;
kbuf_ = new char[ksiz];
std::memcpy(kbuf_, kbuf, ksiz);
ksiz_ = ksiz;
}
/**
* Set an additional data compressor.
* @param comp the additional data data compressor.
*/
void set_compressor(Compressor* comp) {
_assert_(comp);
comp_ = comp;
}
/**
* Begin the cycle of ciper salt.
* @param salt the additional cipher salt.
*/
void begin_cycle(uint64_t salt = 0) {
salt_ = salt;
cycle_ = true;
}
private:
/**
* Compress a serial data.
*/
char* compress(const void* buf, size_t size, size_t* sp) {
_assert_(buf && size <= MEMMAXSIZ && sp);
uint64_t salt = cycle_ ? salt_.add(1) : 0;
char kbuf[NUMBUFSIZ*2];
writefixnum(kbuf, salt, sizeof(salt));
std::memcpy(kbuf + sizeof(salt), kbuf_, ksiz_);
char* tbuf = NULL;
if (comp_) {
tbuf = comp_->compress(buf, size, &size);
if (!tbuf) return NULL;
buf = tbuf;
}
size_t zsiz = sizeof(salt) + size;
char* zbuf = new char[zsiz];
writefixnum(zbuf, salt, sizeof(salt));
arccipher(buf, size, kbuf, sizeof(salt) + ksiz_, zbuf + sizeof(salt));
delete[] tbuf;
if (cycle_) {
size_t range = zsiz - sizeof(salt);
if (range > (size_t)INT8MAX) range = INT8MAX;
salt_.add(hashmurmur(zbuf + sizeof(salt), range) << 32);
}
*sp = zsiz;
return zbuf;
}
/**
* Decompress a serial data.
*/
char* decompress(const void* buf, size_t size, size_t* sp) {
_assert_(buf && size <= MEMMAXSIZ && sp);
if (size < sizeof(uint64_t)) return NULL;
char kbuf[NUMBUFSIZ*2];
std::memcpy(kbuf, buf, sizeof(uint64_t));
std::memcpy(kbuf + sizeof(uint64_t), kbuf_, ksiz_);
buf = (char*)buf + sizeof(uint64_t);
size -= sizeof(uint64_t);
char* zbuf = new char[size];
arccipher(buf, size, kbuf, sizeof(uint64_t) + ksiz_, zbuf);
if (comp_) {
char* tbuf = comp_->decompress(zbuf, size, &size);
delete[] zbuf;
if (!tbuf) return NULL;
zbuf = tbuf;
}
*sp = size;
return zbuf;
}
/** The pointer to the key. */
char* kbuf_;
/** The size of the key. */
size_t ksiz_;
/** The data compressor. */
Compressor* comp_;
/** The cipher salt. */
AtomicInt64 salt_;
/** The flag of the salt cycle */
bool cycle_;
};
/**
* Prepared pointer of the compressor with ZLIB raw mode.
*/
extern ZLIBCompressor<ZLIB::RAW>* const ZLIBRAWCOMP;
} // common namespace
#endif // duplication check
// END OF FILE
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