base64解码包括解码长度代码,C代码库,德仔网

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【C】 base64解码包括解码长度

作者:浮世微凉 / 发布于2015/11/12/ 1538


	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;
	}

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