EnDecode.cpp
上传用户:cydong117
上传日期:2009-11-10
资源大小:638k
文件大小:2k
- // EnDecode.cpp : Defines the entry point for the DLL application.
- //
- #include "stdafx.h"
- static unsigned char Decode6BitMask[5] = { 0xfc, 0xf8, 0xf0, 0xe0, 0xc0 };
- int WINAPI fnEncode6BitBuf(unsigned char *pszSrc, char *pszDest, int nSrcLen, int nDestLen)
- {
- int nDestPos = 0;
- int nRestCount = 0;
- unsigned char chMade = 0, chRest = 0;
- for (int i = 0; i < nSrcLen; i++)
- {
- if (nDestPos >= nDestLen) break;
-
- chMade = ((chRest | (pszSrc[i] >> (2 + nRestCount))) & 0x3f);
- chRest = (((pszSrc[i] << (8 - (2 + nRestCount))) >> 2) & 0x3f);
- nRestCount += 2;
- if (nRestCount < 6)
- pszDest[nDestPos++] = chMade + 0x3c;
- else
- {
- if (nDestPos < nDestLen - 1)
- {
- pszDest[nDestPos++] = chMade + 0x3c;
- pszDest[nDestPos++] = chRest + 0x3c;
- }
- else
- pszDest[nDestPos++] = chMade + 0x3c;
- nRestCount = 0;
- chRest = 0;
- }
- }
- if (nRestCount > 0)
- pszDest[nDestPos++] = chRest + 0x3c;
- pszDest[nDestPos] = ' ';
- return nDestPos;
- }
- int WINAPI fnDecode6BitBuf(char *pszSrc, char *pszDest, int nDestLen)
- {
- int nLen = strlen((const char *)pszSrc);
- int nDestPos = 0, nBitPos = 2;
- int nMadeBit = 0;
- unsigned char ch, chCode, tmp;
- for (int i = 0; i < nLen; i++)
- {
- if ((pszSrc[i] - 0x3c) >= 0)
- ch = pszSrc[i] - 0x3c;
- else
- {
- nDestPos = 0;
- break;
- }
- if (nDestPos >= nDestLen) break;
- if ((nMadeBit + 6) >= 8)
- {
- chCode = (tmp | ((ch & 0x3f) >> (6 - nBitPos)));
- pszDest[nDestPos++] = chCode;
- nMadeBit = 0;
- if (nBitPos < 6)
- nBitPos += 2;
- else
- {
- nBitPos = 2;
- continue;
- }
- }
- tmp = ((ch << nBitPos) & Decode6BitMask[nBitPos - 2]);
- nMadeBit += (8 - nBitPos);
- }
- // pszDest[nDestPos] = ' ';
- return nDestPos;
- }
- int WINAPI fnEncodeMessage(_LPTDEFAULTMESSAGE lptdm, char *pszBuf, int nLen)
- {
- unsigned char btBuffer[32];
- memcpy(btBuffer, (void *)lptdm, sizeof(_TDEFAULTMESSAGE));
- return fnEncode6BitBuf(btBuffer, pszBuf, sizeof(_TDEFAULTMESSAGE), nLen);
- }
- int WINAPI fnDecodeMessage(_LPTDEFAULTMESSAGE lptdm, char *pszBuf)
- { return fnDecode6BitBuf(pszBuf, (char *)lptdm, sizeof(_TDEFAULTMESSAGE)); }
- void WINAPI fnMakeDefMessage(_LPTDEFAULTMESSAGE lptdm, WORD wIdent, int nRecog, WORD wParam, WORD wTag, WORD wSeries)
- { lptdm->wIdent = wIdent; lptdm->nRecog = nRecog; lptdm->wParam = wParam; lptdm->wTag = wTag; lptdm->wSeries = wSeries; }