- static const unsigned char map[256] =
- {
- 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 253, 255,255, 253, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
- 255, 255, 255, 255, 255, 255, 255, 255, 253, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 62, 255, 255, 255, 63,
- 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255, 255, 254, 255, 255, 255, 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, 255, 255, 255, 255, 255,
- 255, 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, 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, 255, 255, 255, 255, 255
- };
- int base64Decode(char * in,int inlen)
- {
- unsigned char * out = (unsigned char *)malloc(inlen);
- unsigned long t, x, y, z;
- unsigned char c;
- int g = 3;
- for (x = y = z = t = 0; x<inlen;)
- {
- c = map[in[x++]];
- if (c == 255) return -1;
- if (c == 253) continue;
- if (c == 254)
- {
- c = 0;
- g--;
- }
- t = (t<<6)|c;
- if (++y == 4)
- {
- out[z++] = (unsigned char)((t>>16)&255);
- if (g > 1) out[z++] = (unsigned char)((t>>8)&255);
- if (g > 2) out[z++] = (unsigned char)(t&255);
- y = t = 0;
- }
- }
- memcpy(in,out,z);
- free(out);
- return z;
- }
- //该片段来自于http://www.codesnippet.cn/detail/0112201514144.html
来源: http://www.codesnippet.cn/detail/0112201514144.html