char *base64_encode(char *binData, char *base64, int binLength)
{int i = 0;int j = 0;int current = 0;for (i = 0; i < binLength; i += 3) {//获取第一个6位current = (*(binData+i) >> 2) & 0x3F;*(base64 + j++) = base64char[current];//获取第二个6位的前两位current = (*(binData+i) << 4) & 0x30;//如果只有一个字符，那么需要做特殊处理if (binLength <= (i+1)) {*(base64 + j++) = base64char[current];*(base64 + j++) = '=';*(base64 + j++) = '=';break;}//获取第二个6位的后四位current |= (*(binData+i+1) >> 4 ) & 0xf;*(base64 + j++) = base64char[current];//获取第三个6位的前四位current = (*(binData+i+1) << 2 ) & 0x3c;if (binLength <= (i+2)) {*(base64 + j++) = base64char[current];*(base64 + j++) = '=';break;}//获取第三个6位的后两位current |= (*(binData+i+2) >> 6) & 0x03;*(base64 + j++) = base64char[current];//获取第四个6位current = *(binData+i+2) & 0x3F;*(base64 + j++) = base64char[current];}*(base64+j) = '\0';return base64;
}char *base64_decode(char const *base64Str, char *debase64Str, int encodeStrLen)
{int i = 0;int j = 0;int k = 0;char temp[4] = "";for (i = 0; i < encodeStrLen; i += 4) {for (j = 0; j < 64 ; j++) {if (*(base64Str + i) == base64char[j]) {temp[0] = j;}}for (j = 0; j < 64 ; j++) {if (*(base64Str + i + 1) == base64char[j]) {temp[1] = j;}}for (j = 0; j < 64 ; j++) {if (*(base64Str + i + 2) == base64char[j]) {temp[2] = j;}}for (j = 0; j < 64 ; j++) {if (*(base64Str + i + 3) == base64char[j]) {temp[3] = j;}}*(debase64Str + k++) = ((temp[0] << 2) & 0xFC) | ((temp[1]>>4) & 0x03);if ( *(base64Str + i + 2)  == '=' )break;*(debase64Str + k++) = ((temp[1] << 4) & 0xF0) | ((temp[2]>>2) & 0x0F);if ( *(base64Str + i + 3) == '=' )break;*(debase64Str + k++) = ((temp[2] << 6) & 0xF0) | (temp[3] & 0x3F);}return debase64Str;
}