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adding missing files
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
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libretroshare/src/util/rscompress.cc
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190
libretroshare/src/util/rscompress.cc
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/*
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* libretroshare/src/utils: rscompress.cc
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*
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* Basic memory chunk compression, based on openpgp-sdk
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*
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* Copyright 2013 by Cyril Soler
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License Version 2 as published by the Free Software Foundation.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA.
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*
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* Please report all bugs and problems to "csoler@users.sourceforge.net".
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*
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*/
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#include <stdint.h>
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#include <algorithm>
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#include <iostream>
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#include <string.h>
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#include <assert.h>
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#include "rscompress.h"
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#include "zlib.h"
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// 16K buffer size.
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//
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static const unsigned int CHUNK = 16384u ;
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bool RsCompress::compress_memory_chunk(const uint8_t *input_mem,const uint32_t input_size,uint8_t *& output_mem,uint32_t& output_size)
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{
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uint32_t remaining_input = input_size ;
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uint32_t output_offset = 0 ;
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uint32_t input_offset = 0 ;
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output_size = 1024 ;
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output_mem = (uint8_t*)malloc(output_size) ;
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int ret, flush;
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unsigned have;
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int level = 9 ;
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z_stream strm;
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unsigned char in[CHUNK];
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unsigned char out[CHUNK];
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/* allocate deflate state */
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strm.zalloc = Z_NULL;
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strm.zfree = Z_NULL;
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strm.opaque = Z_NULL;
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ret = deflateInit(&strm, level);
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if (ret != Z_OK)
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return false;
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/* compress until end of file */
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do
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{
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uint32_t available_in = std::min(CHUNK,remaining_input) ;
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memcpy(in,input_mem+input_offset,available_in) ;
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strm.avail_in = available_in ;
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remaining_input -= available_in ;
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input_offset += available_in ;
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flush = /*feof(source)*/ remaining_input ? Z_NO_FLUSH: Z_FINISH ;
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strm.next_in = in;
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/* run deflate() on input until output buffer not full, finish
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compression if all of source has been read in */
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do
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{
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strm.avail_out = CHUNK;
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strm.next_out = out;
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ret = deflate(&strm, flush); /* no bad return value */
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assert(ret != Z_STREAM_ERROR); /* state not clobbered */
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have = CHUNK - strm.avail_out;
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if(output_size < have+output_offset)
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{
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//std::cerr << "Growing outputbuffer from " << output_size << " to " << have+output_offset << std::endl;
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output_mem = (uint8_t*)realloc(output_mem,have+output_offset) ;
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output_size = have+output_offset ;
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}
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memcpy(output_mem+output_offset,out,have) ;
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output_offset += have ;
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//std::cerr << "Copying " << have << " bytes to output. New offset=" << output_offset << std::endl;
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} while (strm.avail_out == 0);
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assert(strm.avail_in == 0); /* all input will be used */
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/* done when last data in file processed */
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} while (flush != Z_FINISH);
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assert(ret == Z_STREAM_END); /* stream will be complete */
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/* clean up and return */
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(void)deflateEnd(&strm);
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output_size = output_offset ;
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return true ;
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}
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bool RsCompress::uncompress_memory_chunk(const uint8_t *input_mem,const uint32_t input_size,uint8_t *& output_mem,uint32_t& output_size)
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{
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uint32_t remaining_input = input_size ;
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output_size = input_size ;
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uint32_t output_offset = 0 ;
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uint32_t input_offset = 0 ;
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output_mem = (uint8_t*)malloc(output_size) ;
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int ret;
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unsigned have;
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z_stream strm;
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unsigned char in[CHUNK];
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unsigned char out[CHUNK];
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/* allocate inflate state */
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strm.zalloc = Z_NULL;
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strm.zfree = Z_NULL;
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strm.opaque = Z_NULL;
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strm.avail_in = 0;
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strm.next_in = Z_NULL;
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ret = inflateInit(&strm);
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if (ret != Z_OK)
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return ret;
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/* decompress until deflate stream ends or end of file */
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do
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{
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uint32_t available_in = std::min(CHUNK,remaining_input) ;
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memcpy(in,input_mem,available_in) ;
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strm.avail_in = available_in ;
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remaining_input -= available_in ;
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input_offset += available_in ;
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if (strm.avail_in == 0)
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break;
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strm.next_in = in;
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/* run inflate() on input until output buffer not full */
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do {
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strm.avail_out = CHUNK;
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strm.next_out = out;
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ret = inflate(&strm, Z_NO_FLUSH);
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assert(ret != Z_STREAM_ERROR); /* state not clobbered */
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switch (ret) {
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case Z_NEED_DICT:
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ret = Z_DATA_ERROR; /* and fall through */
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case Z_DATA_ERROR:
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case Z_MEM_ERROR:
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(void)inflateEnd(&strm);
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return ret;
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}
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have = CHUNK - strm.avail_out;
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if(output_size < have+output_offset)
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{
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output_mem = (uint8_t*)realloc(output_mem,have+output_offset) ;
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output_size = have+output_offset ;
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}
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memcpy(output_mem+output_offset,out,have) ;
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output_offset += have ;
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} while (strm.avail_out == 0);
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/* done when inflate() says it's done */
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} while (ret != Z_STREAM_END);
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/* clean up and return */
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(void)inflateEnd(&strm);
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output_size = output_offset ;
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return ret == Z_STREAM_END ;
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}
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34
libretroshare/src/util/rscompress.h
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34
libretroshare/src/util/rscompress.h
Normal file
@ -0,0 +1,34 @@
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/*
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* libretroshare/src/utils: rscompress.h
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*
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* Basic memory chunk compression, based on openpgp-sdk
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*
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* Copyright 2013 by Cyril Soler
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License Version 2 as published by the Free Software Foundation.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA.
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*
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* Please report all bugs and problems to "csoler@users.sourceforge.net".
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*
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*/
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#pragma once
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class RsCompress
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{
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public:
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static bool compress_memory_chunk(const uint8_t *input_mem,const uint32_t input_size,uint8_t *& output_mem,uint32_t& output_size) ;
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static bool uncompress_memory_chunk(const uint8_t *input_mem,const uint32_t input_size,uint8_t *& output_mem,uint32_t& output_size) ;
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};
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