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/*
* This file is part of nzbget
*
* Copyright (C) 2004 Sven Henkel <sidddy@users.sourceforge.net>
* Copyright (C) 2007-2008 Andrei Prygounkov <hugbug@users.sourceforge.net>
*
* 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 2 of the License, or
* (at your option) 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $Revision: 198 $
* $Date: 2008-07-29 22:32:23 +0200 (Di, 29 Jul 2008) $
*
*/
#ifndef DECODER_H
#define DECODER_H
class Decoder
{
public:
enum EStatus
{
eUnknownError,
eFinished,
eArticleIncomplete,
eCrcError,
eInvalidSize,
eNoBinaryData
};
enum EFormat
{
efUnknown,
efYenc,
efUx,
};
static const char* FormatNames[];
protected:
const char* m_szSrcFilename;
const char* m_szDestFilename;
char* m_szArticleFilename;
public:
Decoder();
virtual ~Decoder();
virtual EStatus Check() = 0;
virtual void Clear();
virtual bool Write(char* buffer, int len, FILE* outfile) = 0;
void SetSrcFilename(const char* szSrcFilename) { m_szSrcFilename = szSrcFilename; }
void SetDestFilename(const char* szDestFilename) { m_szDestFilename = szDestFilename; }
const char* GetArticleFilename() { return m_szArticleFilename; }
static EFormat DetectFormat(const char* buffer, int len);
};
class YDecoder: public Decoder
{
protected:
static unsigned int crc_tab[256];
bool m_bBegin;
bool m_bPart;
bool m_bBody;
bool m_bEnd;
bool m_bCrc;
unsigned long m_lExpectedCRC;
unsigned long m_lCalculatedCRC;
unsigned long m_iBegin;
unsigned long m_iEnd;
unsigned long m_iSize;
unsigned long m_iEndSize;
bool m_bAutoSeek;
bool m_bNeedSetPos;
bool m_bCrcCheck;
unsigned int DecodeBuffer(char* buffer);
static void crc32gentab();
unsigned long crc32m(unsigned long startCrc, unsigned char *block, unsigned int length);
public:
YDecoder();
virtual EStatus Check();
virtual void Clear();
virtual bool Write(char* buffer, int len, FILE* outfile);
void SetAutoSeek(bool bAutoSeek) { m_bAutoSeek = m_bNeedSetPos = bAutoSeek; }
void SetCrcCheck(bool bCrcCheck) { m_bCrcCheck = bCrcCheck; }
static void Init();
static void Final();
};
class UDecoder: public Decoder
{
private:
bool m_bBody;
bool m_bEnd;
unsigned int DecodeBuffer(char* buffer, int len);
public:
UDecoder();
virtual EStatus Check();
virtual void Clear();
virtual bool Write(char* buffer, int len, FILE* outfile);
};
#endif
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