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321 lines
6.4 KiB
C++
321 lines
6.4 KiB
C++
// CBase64.cpp: implementation of the CBase64 class.
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//
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//////////////////////////////////////////////////////////////////////
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#include "Base64.h"
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// Digits...
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static char Base64Digits[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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BOOL CBase64::m_Init = FALSE;
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char CBase64::m_DecodeTable[256];
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#ifndef PAGESIZE
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#define PAGESIZE 4096
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#endif
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#ifndef ROUNDTOPAGE
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#define ROUNDTOPAGE(a) (((a/4096)+1)*4096)
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#endif
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//////////////////////////////////////////////////////////////////////
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// Construction/Destruction
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//////////////////////////////////////////////////////////////////////
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CBase64::CBase64()
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: m_pDBuffer(NULL),
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m_pEBuffer(NULL),
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m_nDBufLen(0),
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m_nEBufLen(0),
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m_nDDataLen(0),
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m_nEDataLen(0)
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{
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}
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CBase64::~CBase64()
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{
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if(m_pDBuffer != NULL)
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delete [] m_pDBuffer;
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if(m_pEBuffer != NULL)
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delete [] m_pEBuffer;
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}
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LPCSTR CBase64::DecodedMessage() const
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{
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return (LPCSTR) m_pDBuffer;
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}
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LPCSTR CBase64::EncodedMessage() const
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{
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return (LPCSTR) m_pEBuffer;
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}
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void CBase64::AllocEncode(DWORD nSize)
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{
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if(m_nEBufLen < nSize)
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{
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if(m_pEBuffer != NULL)
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delete [] m_pEBuffer;
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m_nEBufLen = ROUNDTOPAGE(nSize);
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m_pEBuffer = new BYTE[m_nEBufLen];
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}
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::ZeroMemory(m_pEBuffer, m_nEBufLen);
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m_nEDataLen = 0;
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}
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void CBase64::AllocDecode(DWORD nSize)
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{
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if(m_nDBufLen < nSize)
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{
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if(m_pDBuffer != NULL)
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delete [] m_pDBuffer;
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m_nDBufLen = ROUNDTOPAGE(nSize);
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m_pDBuffer = new BYTE[m_nDBufLen];
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}
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::ZeroMemory(m_pDBuffer, m_nDBufLen);
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m_nDDataLen = 0;
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}
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void CBase64::SetEncodeBuffer(const PBYTE pBuffer, DWORD nBufLen)
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{
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DWORD i = 0;
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AllocEncode(nBufLen);
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while(i < nBufLen)
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{
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if(!_IsBadMimeChar(pBuffer[i]))
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{
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m_pEBuffer[m_nEDataLen] = pBuffer[i];
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m_nEDataLen++;
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}
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i++;
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}
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}
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void CBase64::SetDecodeBuffer(const PBYTE pBuffer, DWORD nBufLen)
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{
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AllocDecode(nBufLen);
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::CopyMemory(m_pDBuffer, pBuffer, nBufLen);
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m_nDDataLen = nBufLen;
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}
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void CBase64::Encode(const PBYTE pBuffer, DWORD nBufLen)
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{
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SetDecodeBuffer(pBuffer, nBufLen);
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AllocEncode(nBufLen * 2);
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TempBucket Raw;
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DWORD nIndex = 0;
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while((nIndex + 3) <= nBufLen)
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{
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Raw.Clear();
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::CopyMemory(&Raw, m_pDBuffer + nIndex, 3);
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Raw.nSize = 3;
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_EncodeToBuffer(Raw, m_pEBuffer + m_nEDataLen);
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nIndex += 3;
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m_nEDataLen += 4;
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}
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if(nBufLen > nIndex)
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{
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Raw.Clear();
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Raw.nSize = (BYTE) (nBufLen - nIndex);
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::CopyMemory(&Raw, m_pDBuffer + nIndex, nBufLen - nIndex);
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_EncodeToBuffer(Raw, m_pEBuffer + m_nEDataLen);
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m_nEDataLen += 4;
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}
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}
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void CBase64::Encode(LPCSTR szMessage)
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{
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if(szMessage != NULL)
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CBase64::Encode((const PBYTE)szMessage, lstrlenA(szMessage));
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}
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void CBase64::Decode(const PBYTE pBuffer, DWORD dwBufLen)
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{
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if(!CBase64::m_Init)
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_Init();
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SetEncodeBuffer(pBuffer, dwBufLen);
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AllocDecode(dwBufLen);
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TempBucket Raw;
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DWORD nIndex = 0;
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while((nIndex + 4) <= m_nEDataLen)
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{
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Raw.Clear();
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Raw.nData[0] = CBase64::m_DecodeTable[m_pEBuffer[nIndex]];
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Raw.nData[1] = CBase64::m_DecodeTable[m_pEBuffer[nIndex + 1]];
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Raw.nData[2] = CBase64::m_DecodeTable[m_pEBuffer[nIndex + 2]];
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Raw.nData[3] = CBase64::m_DecodeTable[m_pEBuffer[nIndex + 3]];
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if(Raw.nData[2] == 255)
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Raw.nData[2] = 0;
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if(Raw.nData[3] == 255)
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Raw.nData[3] = 0;
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Raw.nSize = 4;
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_DecodeToBuffer(Raw, m_pDBuffer + m_nDDataLen);
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nIndex += 4;
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m_nDDataLen += 3;
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}
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// If nIndex < m_nEDataLen, then we got a decode message without padding.
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// We may want to throw some kind of warning here, but we are still required
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// to handle the decoding as if it was properly padded.
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if(nIndex < m_nEDataLen)
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{
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Raw.Clear();
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for(DWORD i = nIndex; i < m_nEDataLen; i++)
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{
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Raw.nData[i - nIndex] = CBase64::m_DecodeTable[m_pEBuffer[i]];
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Raw.nSize++;
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if(Raw.nData[i - nIndex] == 255)
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Raw.nData[i - nIndex] = 0;
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}
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_DecodeToBuffer(Raw, m_pDBuffer + m_nDDataLen);
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m_nDDataLen += (m_nEDataLen - nIndex);
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}
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}
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void CBase64::Decode(LPCSTR szMessage)
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{
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if(szMessage != NULL)
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CBase64::Decode((const PBYTE)szMessage, lstrlenA(szMessage));
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}
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DWORD CBase64::_DecodeToBuffer(const TempBucket &Decode, PBYTE pBuffer)
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{
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TempBucket Data;
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DWORD nCount = 0;
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_DecodeRaw(Data, Decode);
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for(int i = 0; i < 3; i++)
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{
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pBuffer[i] = Data.nData[i];
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if(pBuffer[i] != 255)
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nCount++;
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}
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return nCount;
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}
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void CBase64::_EncodeToBuffer(const TempBucket &Decode, PBYTE pBuffer)
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{
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TempBucket Data;
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_EncodeRaw(Data, Decode);
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for(int i = 0; i < 4; i++)
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pBuffer[i] = Base64Digits[Data.nData[i]];
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switch(Decode.nSize)
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{
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case 1:
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pBuffer[2] = '=';
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case 2:
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pBuffer[3] = '=';
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}
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}
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void CBase64::_DecodeRaw(TempBucket &Data, const TempBucket &Decode)
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{
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BYTE nTemp;
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Data.nData[0] = Decode.nData[0];
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Data.nData[0] <<= 2;
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nTemp = Decode.nData[1];
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nTemp >>= 4;
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nTemp &= 0x03;
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Data.nData[0] |= nTemp;
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Data.nData[1] = Decode.nData[1];
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Data.nData[1] <<= 4;
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nTemp = Decode.nData[2];
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nTemp >>= 2;
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nTemp &= 0x0F;
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Data.nData[1] |= nTemp;
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Data.nData[2] = Decode.nData[2];
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Data.nData[2] <<= 6;
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nTemp = Decode.nData[3];
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nTemp &= 0x3F;
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Data.nData[2] |= nTemp;
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}
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void CBase64::_EncodeRaw(TempBucket &Data, const TempBucket &Decode)
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{
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BYTE nTemp;
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Data.nData[0] = Decode.nData[0];
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Data.nData[0] >>= 2;
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Data.nData[1] = Decode.nData[0];
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Data.nData[1] <<= 4;
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nTemp = Decode.nData[1];
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nTemp >>= 4;
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Data.nData[1] |= nTemp;
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Data.nData[1] &= 0x3F;
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Data.nData[2] = Decode.nData[1];
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Data.nData[2] <<= 2;
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nTemp = Decode.nData[2];
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nTemp >>= 6;
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Data.nData[2] |= nTemp;
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Data.nData[2] &= 0x3F;
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Data.nData[3] = Decode.nData[2];
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Data.nData[3] &= 0x3F;
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}
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BOOL CBase64::_IsBadMimeChar(BYTE nData)
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{
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switch(nData)
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{
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case '\r': case '\n': case '\t': case ' ' :
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case '\b': case '\a': case '\f': case '\v':
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return TRUE;
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default:
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return FALSE;
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}
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}
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void CBase64::_Init()
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{ // Initialize Decoding table.
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int i;
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for(i = 0; i < 256; i++)
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CBase64::m_DecodeTable[i] = -2;
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for(i = 0; i < 64; i++)
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{
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CBase64::m_DecodeTable[Base64Digits[i]] = (CHAR)i;
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CBase64::m_DecodeTable[Base64Digits[i]|0x80] = (CHAR)i;
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}
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CBase64::m_DecodeTable['='] = -1;
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CBase64::m_DecodeTable['='|0x80] = -1;
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CBase64::m_Init = TRUE;
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}
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