mirror of
https://github.com/nzbget/nzbget.git
synced 2026-01-06 04:58:54 -05:00
371 lines
6.9 KiB
C++
371 lines
6.9 KiB
C++
/*
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* This file is part of nzbget
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*
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* Copyright (C) 2007-2014 Andrey Prygunkov <hugbug@users.sourceforge.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $Revision$
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* $Date$
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef WIN32
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#include "win32.h"
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#ifndef WIN32
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#include <unistd.h>
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#endif
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#include "nzbget.h"
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#include "Decoder.h"
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#include "Log.h"
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#include "Util.h"
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const char* Decoder::FormatNames[] = { "Unknown", "yEnc", "UU" };
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Decoder::Decoder()
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{
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debug("Creating Decoder");
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m_szArticleFilename = NULL;
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}
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Decoder::~ Decoder()
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{
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debug("Destroying Decoder");
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free(m_szArticleFilename);
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}
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void Decoder::Clear()
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{
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free(m_szArticleFilename);
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m_szArticleFilename = NULL;
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}
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Decoder::EFormat Decoder::DetectFormat(const char* buffer, int len)
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{
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if (!strncmp(buffer, "=ybegin ", 8))
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{
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return efYenc;
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}
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if ((len == 62 || len == 63) && (buffer[62] == '\n' || buffer[62] == '\r') && *buffer == 'M')
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{
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return efUx;
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}
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if (!strncmp(buffer, "begin ", 6))
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{
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bool bOK = true;
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buffer += 6; //strlen("begin ")
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while (*buffer && *buffer != ' ')
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{
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char ch = *buffer++;
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if (ch < '0' || ch > '7')
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{
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bOK = false;
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break;
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}
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}
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if (bOK)
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{
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return efUx;
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}
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}
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return efUnknown;
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}
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/**
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* YDecoder: fast implementation of yEnc-Decoder
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*/
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YDecoder::YDecoder()
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{
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Clear();
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}
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void YDecoder::Clear()
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{
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Decoder::Clear();
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m_bBody = false;
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m_bBegin = false;
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m_bPart = false;
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m_bEnd = false;
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m_bCrc = false;
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m_lExpectedCRC = 0;
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m_lCalculatedCRC = 0xFFFFFFFF;
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m_iBegin = 0;
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m_iEnd = 0;
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m_iSize = 0;
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m_iEndSize = 0;
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m_bCrcCheck = false;
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}
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int YDecoder::DecodeBuffer(char* buffer, int len)
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{
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if (m_bBody && !m_bEnd)
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{
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if (!strncmp(buffer, "=yend ", 6))
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{
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m_bEnd = true;
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char* pb = strstr(buffer, m_bPart ? " pcrc32=" : " crc32=");
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if (pb)
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{
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m_bCrc = true;
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pb += 7 + (int)m_bPart; //=strlen(" crc32=") or strlen(" pcrc32=")
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m_lExpectedCRC = strtoul(pb, NULL, 16);
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}
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pb = strstr(buffer, " size=");
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if (pb)
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{
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pb += 6; //=strlen(" size=")
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m_iEndSize = (long long)atoll(pb);
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}
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return 0;
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}
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char* iptr = buffer;
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char* optr = buffer;
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while (true)
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{
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switch (*iptr)
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{
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case '=': //escape-sequence
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iptr++;
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*optr = *iptr - 64 - 42;
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optr++;
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break;
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case '\n': // ignored char
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case '\r': // ignored char
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break;
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case '\0':
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goto BreakLoop;
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default: // normal char
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*optr = *iptr - 42;
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optr++;
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break;
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}
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iptr++;
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}
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BreakLoop:
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if (m_bCrcCheck)
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{
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m_lCalculatedCRC = Util::Crc32m(m_lCalculatedCRC, (unsigned char *)buffer, (unsigned int)(optr - buffer));
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}
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return optr - buffer;
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}
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else
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{
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if (!m_bPart && !strncmp(buffer, "=ybegin ", 8))
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{
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m_bBegin = true;
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char* pb = strstr(buffer, " name=");
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if (pb)
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{
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pb += 6; //=strlen(" name=")
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char* pe;
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for (pe = pb; *pe != '\0' && *pe != '\n' && *pe != '\r'; pe++) ;
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free(m_szArticleFilename);
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m_szArticleFilename = (char*)malloc(pe - pb + 1);
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strncpy(m_szArticleFilename, pb, pe - pb);
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m_szArticleFilename[pe - pb] = '\0';
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}
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pb = strstr(buffer, " size=");
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if (pb)
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{
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pb += 6; //=strlen(" size=")
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m_iSize = (long long)atoll(pb);
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}
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m_bPart = strstr(buffer, " part=");
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if (!m_bPart)
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{
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m_bBody = true;
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m_iBegin = 1;
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m_iEnd = m_iSize;
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}
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}
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else if (m_bPart && !strncmp(buffer, "=ypart ", 7))
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{
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m_bPart = true;
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m_bBody = true;
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char* pb = strstr(buffer, " begin=");
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if (pb)
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{
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pb += 7; //=strlen(" begin=")
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m_iBegin = (long long)atoll(pb);
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}
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pb = strstr(buffer, " end=");
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if (pb)
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{
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pb += 5; //=strlen(" end=")
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m_iEnd = (long long)atoll(pb);
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}
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}
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}
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return 0;
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}
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Decoder::EStatus YDecoder::Check()
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{
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m_lCalculatedCRC ^= 0xFFFFFFFF;
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debug("Expected crc32=%x", m_lExpectedCRC);
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debug("Calculated crc32=%x", m_lCalculatedCRC);
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if (!m_bBegin)
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{
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return eNoBinaryData;
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}
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else if (!m_bEnd)
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{
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return eArticleIncomplete;
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}
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else if (!m_bPart && m_iSize != m_iEndSize)
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{
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return eInvalidSize;
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}
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else if (m_bCrcCheck && m_bCrc && (m_lExpectedCRC != m_lCalculatedCRC))
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{
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return eCrcError;
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}
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return eFinished;
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}
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/**
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* UDecoder: supports UU encoding formats
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*/
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UDecoder::UDecoder()
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{
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}
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void UDecoder::Clear()
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{
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Decoder::Clear();
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m_bBody = false;
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m_bEnd = false;
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}
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/* DecodeBuffer-function uses portions of code from tool UUDECODE by Clem Dye
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* UUDECODE.c (http://www.bastet.com/uue.zip)
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* Copyright (C) 1998 Clem Dye
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*
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* Released under GPL (thanks)
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*/
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#define UU_DECODE_CHAR(c) (c == '`' ? 0 : (((c) - ' ') & 077))
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int UDecoder::DecodeBuffer(char* buffer, int len)
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{
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if (!m_bBody)
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{
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if (!strncmp(buffer, "begin ", 6))
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{
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char* pb = buffer;
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pb += 6; //strlen("begin ")
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// skip file-permissions
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for (; *pb != ' ' && *pb != '\0' && *pb != '\n' && *pb != '\r'; pb++) ;
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pb++;
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// extracting filename
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char* pe;
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for (pe = pb; *pe != '\0' && *pe != '\n' && *pe != '\r'; pe++) ;
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free(m_szArticleFilename);
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m_szArticleFilename = (char*)malloc(pe - pb + 1);
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strncpy(m_szArticleFilename, pb, pe - pb);
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m_szArticleFilename[pe - pb] = '\0';
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m_bBody = true;
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return 0;
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}
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else if ((len == 62 || len == 63) && (buffer[62] == '\n' || buffer[62] == '\r') && *buffer == 'M')
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{
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m_bBody = true;
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}
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}
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if (m_bBody && (!strncmp(buffer, "end ", 4) || *buffer == '`'))
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{
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m_bEnd = true;
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}
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if (m_bBody && !m_bEnd)
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{
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int iEffLen = UU_DECODE_CHAR(buffer[0]);
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if (iEffLen > len)
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{
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// error;
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return 0;
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}
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char* iptr = buffer;
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char* optr = buffer;
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for (++iptr; iEffLen > 0; iptr += 4, iEffLen -= 3)
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{
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if (iEffLen >= 3)
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{
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*optr++ = UU_DECODE_CHAR (iptr[0]) << 2 | UU_DECODE_CHAR (iptr[1]) >> 4;
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*optr++ = UU_DECODE_CHAR (iptr[1]) << 4 | UU_DECODE_CHAR (iptr[2]) >> 2;
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*optr++ = UU_DECODE_CHAR (iptr[2]) << 6 | UU_DECODE_CHAR (iptr[3]);
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}
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else
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{
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if (iEffLen >= 1)
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{
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*optr++ = UU_DECODE_CHAR (iptr[0]) << 2 | UU_DECODE_CHAR (iptr[1]) >> 4;
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}
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if (iEffLen >= 2)
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{
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*optr++ = UU_DECODE_CHAR (iptr[1]) << 4 | UU_DECODE_CHAR (iptr[2]) >> 2;
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}
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}
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}
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return optr - buffer;
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}
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return 0;
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}
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Decoder::EStatus UDecoder::Check()
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{
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if (!m_bBody)
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{
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return eNoBinaryData;
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}
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return eFinished;
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}
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