/*
*
* 编码类的实现
* 作者 Tintin Tintin2000@263.net
* 日期 2001-4-15
* 最后修改 2001-4-19
*
*/
#include "MailCoder.h"
//编码时候的每行的长度
unsigned int CMailCoder::m_LineWidth = 76;
//------------------------------------------------------------------------------
//Base64解码表
const char CMailCoder::BASE64_ENCODE_TABLE[64] = {
65, 66, 67, 68, 69, 70, 71, 72, // 00 - 07
73, 74, 75, 76, 77, 78, 79, 80, // 08 - 15
81, 82, 83, 84, 85, 86, 87, 88, // 16 - 23
89, 90, 97, 98, 99, 100, 101, 102, // 24 - 31
103, 104, 105, 106, 107, 108, 109, 110, // 32 - 39
111, 112, 113, 114, 115, 116, 117, 118, // 40 - 47
119, 120, 121, 122, 48, 49, 50, 51, // 48 - 55
52, 53, 54, 55, 56, 57, 43, 47 };// 56 - 63
//Base64编码表
const unsigned int CMailCoder::BASE64_DECODE_TABLE[256] = {
255, 255, 255, 255, 255, 255, 255, 255, // 00 - 07
255, 255, 255, 255, 255, 255, 255, 255, // 08 - 15
255, 255, 255, 255, 255, 255, 255, 255, // 16 - 23
255, 255, 255, 255, 255, 255, 255, 255, // 24 - 31
255, 255, 255, 255, 255, 255, 255, 255, // 32 - 39
255, 255, 255, 62, 255, 255, 255, 63, // 40 - 47
52, 53, 54, 55, 56, 57, 58, 59, // 48 - 55
60, 61, 255, 255, 255, 255, 255, 255, // 56 - 63
255, 0, 1, 2, 3, 4, 5, 6, // 64 - 71
7, 8, 9, 10, 11, 12, 13, 14, // 72 - 79
15, 16, 17, 18, 19, 20, 21, 22, // 80 - 87
23, 24, 25, 255, 255, 255, 255, 255, // 88 - 95
255, 26, 27, 28, 29, 30, 31, 32, // 96 - 103
33, 34, 35, 36, 37, 38, 39, 40, // 104 - 111
41, 42, 43, 44, 45, 46, 47, 48, // 112 - 119
49, 50, 51, 255, 255, 255, 255, 255, // 120 - 127
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255 };
//------------------------------------------------------------------------------
//Quoted编码表
const unsigned char CMailCoder::QUOTED_ENCODE_TABLE[256] = {
255, 255, 255, 255, 255, 255, 255, 255, // 00 - 07
255, 255, 10, 255, 255, 13, 255, 255, // 08 - 15
255, 255, 255, 255, 255, 255, 255, 255, // 16 - 23
255, 255, 255, 255, 255, 255, 255, 255, // 24 - 31
255, 33, 34, 35, 36, 37, 38, 39,
40, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, 52, 53, 54, 55,
56, 57, 58, 59, 60, 255, 62, 63,
64, 65, 66, 67, 68, 69, 70, 71,
72, 73, 74, 75, 76, 77, 78, 79,
80, 81, 82, 83, 84, 85, 86, 87,
88, 89, 90, 91, 92, 93, 94, 95,
96, 97, 98, 99, 100, 101, 102, 103,
104, 105, 106, 107, 108, 109, 110, 111,
112, 113, 114, 115, 116, 117, 118, 119,
120, 121, 122, 123, 124, 125, 126, 127,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255 };
//------------------------------------------------------------------------------
//获取Base64编码长度
int CMailCoder::Base64EncodeSize(int iSize)
{
int nSize, nCR;
nSize = (iSize + 2) / 3 * 4 ;
nCR = nSize / m_LineWidth; //计算回车数量
nSize+= nCR * 2;
return nSize;
}
//------------------------------------------------------------------------------
//获取Base64解码长度
int CMailCoder::Base64DecodeSize(int iSize)
{
return (iSize + 3) / 4 * 3;
}
//------------------------------------------------------------------------------
//获取UUCode编码长度
int CMailCoder::UUEncodeSize(int iSize)
{
int nSize, nCR;
nSize = (iSize + 2) / 3 * 4 ;
nCR = nSize / m_LineWidth + 2; //计算回车数量
nSize+= nCR * 3 + 2;
return nSize;
}
//------------------------------------------------------------------------------
//获取UUCode解码长度
int CMailCoder::UUDecodeSize(int iSize)
{
return (iSize + 3) / 4 * 3;
}
//------------------------------------------------------------------------------
//获取Quoted编码长度
int CMailCoder::QuotedEncodeSize(int iSize)
{
int nSize = iSize * 3 + 1;
int nCR = nSize / m_LineWidth;
nSize+= nCR * 3;
return nSize;
}
//------------------------------------------------------------------------------
//Base64编码
int CMailCoder::base64_encode(char *pSrc, unsigned int nSize, char *pDest)
{
if ((pSrc == NULL) || (nSize <= 0)) return 0;
unsigned int iB, iInMax3, Len;
char *pInPtr, *pInLimitPtr;
char *OutPtr ;
pInPtr = pSrc;
iInMax3 = nSize / 3 * 3;
OutPtr = pDest;
pInLimitPtr = pInPtr + iInMax3;
while (pInPtr != pInLimitPtr)
{
Len = 0;
while ((Len < m_LineWidth) && (pInPtr != pInLimitPtr))
{
iB = (unsigned char) *pInPtr++;
iB = iB << 8;
iB = iB | (unsigned char) *pInPtr++;
iB = iB << 8;
iB = iB | (unsigned char) *pInPtr++;
//以4 byte倒序写入输出缓冲
OutPtr[3] = BASE64_ENCODE_TABLE[iB & 0x3F];
iB = iB >> 6;
OutPtr[2] = BASE64_ENCODE_TABLE[iB & 0x3F];
iB = iB >> 6;
OutPtr[1] = BASE64_ENCODE_TABLE[iB & 0x3F];
iB = iB >> 6;
OutPtr[0] = BASE64_ENCODE_TABLE[iB];
OutPtr+=4;
Len+=4;
}
if (Len >= m_LineWidth)
{
*OutPtr++ = '\r'; //加上回车换行符
*OutPtr++ = '\n';
}
}
//设置尾部
switch (nSize - iInMax3)
{
case 1:
iB = (unsigned char) *pInPtr;
iB = iB << 4;
OutPtr[1] = BASE64_ENCODE_TABLE[iB & 0x3F];
iB = iB >> 6;
OutPtr[0] = BASE64_ENCODE_TABLE[iB];
OutPtr[2] = '='; //用'='也就是64码填充剩余部分
OutPtr[3] = '=';
OutPtr+=4;
break;
case 2:
iB = (unsigned char) *pInPtr++;
iB = iB << 8;
iB = iB | (unsigned char) *pInPtr;
iB = iB << 2;
OutPtr[2] = BASE64_ENCODE_TABLE[iB & 0x3F];
iB = iB >> 6;
OutPtr[1] = BASE64_ENCODE_TABLE[iB & 0x3F];
iB = iB >> 6;
OutPtr[0] = BASE64_ENCODE_TABLE[iB];
OutPtr[3] = '='; // Fill remaining byte.
OutPtr+=4;
break;
}
return (unsigned int) (OutPtr - pDest);
}
//------------------------------------------------------------------------------
//Base64解码
int CMailCoder::base64_decode(char *pSrc, unsigned int nSize, char *pDest)
{
if ((pSrc == NULL) || (pDest == NULL) || (nSize <= 0)) return 0;
unsigned int lByteBuffer, lByteBufferSpace;
unsigned int C; //临时阅读变量
int reallen;
char *InPtr, *InLimitPtr;
char *OutPtr;
lByteBuffer = 0; lByteBufferSpace = 4;
InPtr = pSrc;
InLimitPtr= InPtr + nSize;
OutPtr = pDest;
while (InPtr != InLimitPtr)
{
C = BASE64_DECODE_TABLE[*InPtr]; // Read from InputBuffer.
InPtr++;
if (C == 0xFF) continue; //读到255非法字符
lByteBuffer = lByteBuffer << 6 ;
lByteBuffer = lByteBuffer | C ;
lByteBufferSpace--;
if (lByteBufferSpace != 0) continue; //一次读入4个字节
//到序写入3个字节到缓冲
OutPtr[2] = lByteBuffer;
lByteBuffer = lByteBuffer >> 8;
OutPtr[1] = lByteBuffer;
lByteBuffer = lByteBuffer >>
