79 lines
2.3 KiB
C++
79 lines
2.3 KiB
C++
/*
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* jastegal.h
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*
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* The files in this directory and elsewhere which refer to this LICENCE
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* file are part of Jastegal (Just Another Steganography algorithm)
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*
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* Copyright (C) 2009 BlackLight
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*
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* Jastegal is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 3 or (at your option) any later
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* version.
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*
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* Jastegal is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with Jastegal; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* As a special exception, if other files instantiate templates or use
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* macros or inline functions from these files, or you compile these
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* files and link them with other works to produce a work based on these
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* files, these files do not by themselves cause the resulting work to be
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* covered by the GNU General Public License. However the source code for
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* these files must still be made available in accordance with section (3)
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* of the GNU General Public License.
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*
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* This exception does not invalidate any other reasons why a work based on
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* this file might be covered by the GNU General Public License.
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*/
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#include <iostream>
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#include <string>
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#include <zlib.h>
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using namespace std;
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char* zCompress (char* uncompressed, unsigned int uLen, unsigned int &cLen) {
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char *compressed = new char[uLen+10];
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if (!compressed)
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return NULL;
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if (compress((Bytef*) compressed, (uLongf*) &cLen, (Bytef*) uncompressed, uLen) < 0)
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return NULL;
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return compressed;
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}
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char* zUncompress (char* compressed, unsigned int cLen, unsigned int &uLen) {
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uLen = cLen;
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int ret = 4;
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char *uncompressed = NULL;
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while ((uLen < 4000000) && (ret != Z_OK)) {
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if (uncompressed)
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delete [] uncompressed;
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uncompressed = new char[uLen+10];
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if (!uncompressed)
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return NULL;
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ret = uncompress((Bytef*) uncompressed, (uLongf*) &uLen, (Bytef*) compressed, cLen);
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if (ret == Z_MEM_ERROR || ret == Z_BUF_ERROR)
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return NULL;
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if (ret != Z_OK)
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uLen *= 2;
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}
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return uncompressed;
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}
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