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git-svn-id: http://svn.code.sf.net/p/retroshare/code/branches/v0.6-initdev@6810 b45a01b8-16f6-495d-af2f-9b41ad6348cc
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csoler 2013-10-06 20:16:58 +00:00
parent 120a27d9c7
commit 4b9378aadd
2 changed files with 224 additions and 0 deletions
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190
libretroshare/src/util/rscompress.cc Normal file
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/*
* libretroshare/src/utils: rscompress.cc
*
* Basic memory chunk compression, based on openpgp-sdk
*
* Copyright 2013 by Cyril Soler
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License Version 2 as published by the Free Software Foundation.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA.
*
* Please report all bugs and problems to "csoler@users.sourceforge.net".
*
*/
#include <stdint.h>
#include <algorithm>
#include <iostream>
#include <string.h>
#include <assert.h>
#include "rscompress.h"
#include "zlib.h"
// 16K buffer size.
//
static const unsigned int CHUNK = 16384u ;
bool RsCompress::compress_memory_chunk(const uint8_t *input_mem,const uint32_t input_size,uint8_t *& output_mem,uint32_t& output_size)
{
uint32_t remaining_input = input_size ;
uint32_t output_offset = 0 ;
uint32_t input_offset = 0 ;
output_size = 1024 ;
output_mem = (uint8_t*)malloc(output_size) ;
int ret, flush;
unsigned have;
int level = 9 ;
z_stream strm;
unsigned char in[CHUNK];
unsigned char out[CHUNK];
/* allocate deflate state */
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
ret = deflateInit(&strm, level);
if (ret != Z_OK)
return false;
/* compress until end of file */
do
{
uint32_t available_in = std::min(CHUNK,remaining_input) ;
memcpy(in,input_mem+input_offset,available_in) ;
strm.avail_in = available_in ;
remaining_input -= available_in ;
input_offset += available_in ;
flush = /*feof(source)*/ remaining_input ? Z_NO_FLUSH: Z_FINISH ;
strm.next_in = in;
/* run deflate() on input until output buffer not full, finish
compression if all of source has been read in */
do
{
strm.avail_out = CHUNK;
strm.next_out = out;
ret = deflate(&strm, flush); /* no bad return value */
assert(ret != Z_STREAM_ERROR); /* state not clobbered */
have = CHUNK - strm.avail_out;
if(output_size < have+output_offset)
{
//std::cerr << "Growing outputbuffer from " << output_size << " to " << have+output_offset << std::endl;
output_mem = (uint8_t*)realloc(output_mem,have+output_offset) ;
output_size = have+output_offset ;
}
memcpy(output_mem+output_offset,out,have) ;
output_offset += have ;
//std::cerr << "Copying " << have << " bytes to output. New offset=" << output_offset << std::endl;
} while (strm.avail_out == 0);
assert(strm.avail_in == 0); /* all input will be used */
/* done when last data in file processed */
} while (flush != Z_FINISH);
assert(ret == Z_STREAM_END); /* stream will be complete */
/* clean up and return */
(void)deflateEnd(&strm);
output_size = output_offset ;
return true ;
}
bool RsCompress::uncompress_memory_chunk(const uint8_t *input_mem,const uint32_t input_size,uint8_t *& output_mem,uint32_t& output_size)
{
uint32_t remaining_input = input_size ;
output_size = input_size ;
uint32_t output_offset = 0 ;
uint32_t input_offset = 0 ;
output_mem = (uint8_t*)malloc(output_size) ;
int ret;
unsigned have;
z_stream strm;
unsigned char in[CHUNK];
unsigned char out[CHUNK];
/* allocate inflate state */
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = 0;
strm.next_in = Z_NULL;
ret = inflateInit(&strm);
if (ret != Z_OK)
return ret;
/* decompress until deflate stream ends or end of file */
do
{
uint32_t available_in = std::min(CHUNK,remaining_input) ;
memcpy(in,input_mem,available_in) ;
strm.avail_in = available_in ;
remaining_input -= available_in ;
input_offset += available_in ;
if (strm.avail_in == 0)
break;
strm.next_in = in;
/* run inflate() on input until output buffer not full */
do {
strm.avail_out = CHUNK;
strm.next_out = out;
ret = inflate(&strm, Z_NO_FLUSH);
assert(ret != Z_STREAM_ERROR); /* state not clobbered */
switch (ret) {
case Z_NEED_DICT:
ret = Z_DATA_ERROR; /* and fall through */
case Z_DATA_ERROR:
case Z_MEM_ERROR:
(void)inflateEnd(&strm);
return ret;
}
have = CHUNK - strm.avail_out;
if(output_size < have+output_offset)
{
output_mem = (uint8_t*)realloc(output_mem,have+output_offset) ;
output_size = have+output_offset ;
}
memcpy(output_mem+output_offset,out,have) ;
output_offset += have ;
} while (strm.avail_out == 0);
/* done when inflate() says it's done */
} while (ret != Z_STREAM_END);
/* clean up and return */
(void)inflateEnd(&strm);
output_size = output_offset ;
return ret == Z_STREAM_END ;
}

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libretroshare/src/util/rscompress.h Normal file
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/*
* libretroshare/src/utils: rscompress.h
*
* Basic memory chunk compression, based on openpgp-sdk
*
* Copyright 2013 by Cyril Soler
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License Version 2 as published by the Free Software Foundation.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA.
*
* Please report all bugs and problems to "csoler@users.sourceforge.net".
*
*/
#pragma once
class RsCompress
{
public:
static bool compress_memory_chunk(const uint8_t *input_mem,const uint32_t input_size,uint8_t *& output_mem,uint32_t& output_size) ;
static bool uncompress_memory_chunk(const uint8_t *input_mem,const uint32_t input_size,uint8_t *& output_mem,uint32_t& output_size) ;
};