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////////////////////////////////////////////////////////////// base64.h//************************************************************************/// base64编码表////0 A 17 R 34 i 51 z//1 B 18 S 35 j 52 0//2 C 19 T 36 k 53 1//3 D 20 U 37 l 54 2//4 E 21 V 38 m 55 3//5 F 22 W 39 n 56 4//6 G 23 X 40 o 57 5//7 H 24 Y 41 p 58 6//8 I 25 Z 42 q 59 7//9 J 26 a 43 r 60 8//10 K 27 b 44 s 61 9//11 L 28 c 45 t 62 +//12 M 29 d 46 u 63 ///13 N 30 e 47 v (pad) =//14 O 31 f 48 w//15 P 32 g 49 x//16 Q 33 h 50 y//// base64编码步骤：////原文：////你好//C4 E3 BA C3//11000100 11100011 10111010 11000011//00110001 00001110 00001110 00111010//49 14（十进制）//x O O 6字符//01111000 01001111 01001111 00110110//78（十六进制）//xOO6////解码：//xOO6//78 4f 4f 36//01111000 01001111 01001111 00110110//49 14//00110001 00001110 00001110 00111010 31 0e 0e 3a////11000100 11100011 10111010//C4 E3 BA//#ifndef _BASE64_INCLUDE__H__#define _BASE64_INCLUDE__H__// 编码后的长度一般比原文多占1/3的存储空间，请保证base64code有足够的空间inline int Base64Encode(char * base64code, const char * src, int src_len = 0);inline int Base64Decode(char * buf, const char * base64code, int src_len = 0);__inline char GetB64Char(int index){const char szBase64Table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";if (index >= 0 && index < 64)return szBase64Table[index];return '=';}// 从双字中取单字节#define B0(a) (a & 0xFF)#define B1(a) (a >> 8 & 0xFF)#define B2(a) (a >> 16 & 0xFF)#define B3(a) (a >> 24 & 0xFF)// 编码后的长度一般比原文多占1/3的存储空间，请保证base64code有足够的空间inline int Base64Encode(char * base64code, const char * src, int src_len){if (src_len == 0)src_len = strlen(src);int len = 0;unsigned char* psrc = (unsigned char*)src;char * p64 = base64code;for (int i = 0; i < src_len - 3; i += 3){unsigned long ulTmp = *(unsigned long*)psrc;register int b0 = GetB64Char((B0(ulTmp) >> 2) & 0x3F);register int b1 = GetB64Char((B0(ulTmp) << 6 >> 2 B1(ulTmp) >> 4) & 0x3F);register int b2 = GetB64Char((B1(ulTmp) << 4 >> 2 B2(ulTmp) >> 6) & 0x3F);register int b3 = GetB64Char((B2(ulTmp) << 2 >> 2) & 0x3F);*((unsigned long*)p64) = b0 b1 << 8 b2 << 16 b3 << 24;len += 4;p64 += 4;psrc += 3;}// 处理最后余下的不足3字节的饿数据if (i < src_len){int rest = src_len - i;unsigned long ulTmp = 0;for (int j = 0; j < rest; ++j){*(((unsigned char*)&ulTmp) + j) = *psrc++;}p64[0] = GetB64Char((B0(ulTmp) >> 2) & 0x3F);p64[1] = GetB64Char((B0(ulTmp) << 6 >> 2 B1(ulTmp) >> 4) & 0x3F);p64[2] = rest > 1 ? GetB64Char((B1(ulTmp) << 4 >> 2 B2(ulTmp) >> 6) & 0x3F) : '=';p64[3] = rest > 2 ? GetB64Char((B2(ulTmp) << 2 >> 2) & 0x3F) : '=';p64 += 4;len += 4;}*p64 = '\0';return len;}__inline int GetB64Index(char ch){int index = -1;if (ch >= 'A' && ch <= 'Z'){index = ch - 'A';}else if (ch >= 'a' && ch <= 'z'){index = ch - 'a' + 26;}else if (ch >= '0' && ch <= '9'){index = ch - '0' + 52;}else if (ch == '+'){index = 62;}else if (ch == '/'){index = 63;}return index;}// 解码后的长度一般比原文少用占1/4的存储空间，请保证buf有足够的空间inline int Base64Decode(char * buf, const char * base64code, int src_len){if (src_len == 0)src_len = strlen(base64code);int len = 0;unsigned char* psrc = (unsigned char*)base64code;char * pbuf = buf;for (int i = 0; i < src_len - 4; i += 4){unsigned long ulTmp = *(unsigned long*)psrc;register int b0 = (GetB64Index((char)B0(ulTmp)) << 2 GetB64Index((char)B1(ulTmp)) << 2 >> 6) & 0xFF;register int b1 = (GetB64Index((char)B1(ulTmp)) << 4 GetB64Index((char)B2(ulTmp)) << 2 >> 4) & 0xFF;register int b2 = (GetB64Index((char)B2(ulTmp)) << 6 GetB64Index((char)B3(ulTmp)) << 2 >> 2) & 0xFF;*((unsigned long*)pbuf) = b0 b1 << 8 b2 << 16;psrc += 4;pbuf += 3;len += 3;}// 处理最后余下的不足4字节的饿数据if (i < src_len){int rest = src_len - i;unsigned long ulTmp = 0;for (int j = 0; j < rest; ++j){*(((unsigned char*)&ulTmp) + j) = *psrc++;}register int b0 = (GetB64Index((char)B0(ulTmp)) << 2 GetB64Index((char)B1(ulTmp)) << 2 >> 6) & 0xFF;*pbuf++ = b0;len ++;if ('=' != B1(ulTmp) && '=' != B2(ulTmp)){register int b1 = (GetB64Index((char)B1(ulTmp)) << 4 GetB64Index((char)B2(ulTmp)) << 2 >> 4) & 0xFF;*pbuf++ = b1;len ++;}if ('=' != B2(ulTmp) && '=' != B3(ulTmp)){register int b2 = (GetB64Index((char)B2(ulTmp)) << 6 GetB64Index((char)B3(ulTmp)) << 2 >> 2) & 0xFF;*pbuf++ = b2;len ++;}}*pbuf = '\0';return len;}#endif // #ifndef _BASE64_INCLUDE__H__发表于 @ 2006年09月28日 16:50:00评论(loading...AddFeedbackCountStack("1302231"))编辑新一篇:一些编程中困惑的小问题旧一篇:database初级

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