string Base64Decode(const char* Data,int DataByte,int& OutByte) { //解码表 const char DecodeTable[] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 62, // '+' 0, 0, 0, 63, // '/' 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, // '0'-'9' 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, // 'A'-'Z' 0, 0, 0, 0, 0, 0, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51 // 'a'-'z' }; //返回值 string strDecode; int nValue; int i= 0; while (i < DataByte) { if (*Data != '\r' && *Data!='\n') { nValue = DecodeTable[*Data++] << 18; nValue += DecodeTable[*Data++] << 12; strDecode+=(nValue & 0x00FF0000) >> 16; OutByte++; if (*Data != '=') { nValue += DecodeTable[*Data++] << 6; strDecode+=(nValue & 0x0000FF00) >> 8; OutByte++; if (*Data != '=') { nValue += DecodeTable[*Data++]; strDecode+=nValue & 0x000000FF; OutByte++; } } i += 4; } else// 回车换行,跳过 { Data++; i++; } } return strDecode; } char * Cgi_urldecode(char * url) { int len = strlen(url); char *dest = url; char *data = url; while (len--) { if (*data == '+') *dest = ' '; else if (*data == '%' && len >= 2 && isxdigit((int) *(data + 1)) && isxdigit((int) *(data + 2))) { *dest = (char) htoi(data + 1); data += 2; len -= 2; } else *dest = *data; data++; dest++; } *dest = '\0'; return url ; } int htoi(char *s) { int value; int c; c = ((unsigned char *)s)[0]; if (isupper(c)) c = tolower(c); value = (c >= '0' && c <= '9' ? c - '0' : c - 'a' + 10) * 16; c = ((unsigned char *)s)[1]; if (isupper(c)) c = tolower(c); value += c >= '0' && c <= '9' ? c - '0' : c - 'a' + 10; return (value); }
我程序中用到的urldecode和base64decode,MD5
这里是base64decode和urldecode,Md5在附件中。因为我是在后台所以需要解码:
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