{"id":6624,"date":"2015-03-31T12:21:58","date_gmt":"2015-03-31T03:21:58","guid":{"rendered":"http:\/\/www.webshare.co.kr\/?p=6624"},"modified":"2015-04-03T15:04:56","modified_gmt":"2015-04-03T06:04:56","slug":"ccpp-base64-encoding-decoding","status":"publish","type":"post","link":"https:\/\/www.webshare.co.kr\/?p=6624","title":{"rendered":"[C\/CPP] Base64 Encoding & Decoding"},"content":{"rendered":"

\uc544\ub798 \uc790\ub8cc\ub294 \uc77c\uc790\ub294 \uae30\uc5b5\ub098\uc9c0\uc54a\uc9c0\ub9cc \uc778\ud130\ub137 \uc5b4\ub290\uacf3\uc5d0\uc11c \ud37c\uc654\ub358 \uc790\ub8cc\uc785\ub2c8\ub2e4.<\/strong><\/span>
\uc77c\ubd80 \uc218\uc815\ud558\uc600\uc73c\uba70 \uc6d0\uae00\uc758 \ucd9c\ucc98\ub97c \uc544\uc2dc\ub294 \ubd84\uc740 \uc54c\ub824\uc8fc\uc2dc\uba74 \uac10\uc0ac \ub4dc\ub9ac\uaca0\uc2b5\ub2c8\ub2e4.<\/strong><\/span><\/p>\n

 <\/p>\n

\u203b\uac1c\ub150<\/span><\/p>\n

2\uc9c4 \ub370\uc774\ud130\ub97c \uc544\uc2a4\ud0a4 \ud14d\uc2a4\ud2b8\ub85c \ubcc0\ud658\ud558\uac70\ub098 \uadf8 \ubc18\ub300\ub85c \ubcc0\ud658\ud558\ub294 \uc778\ucf54\ub529 \ubc29\ubc95. MIME\uc5d0 \uc758\ud574 \uc0ac\uc6a9\ub418\ub294 \ubc29\ubc95\uc73c\ub85c,<\/span>
4\uac1c\uc758 7\ube44\ud2b8 \uc544\uc2a4\ud0a4 \ubb38\uc790\ub85c \ud45c\ud604\ub418\ub3c4\ub85d \ub370\uc774\ud130\ub97c 3\ubc14\uc774\ud2b8\uc529 4\uac1c\uc758 6\ube44\ud2b8 \ub2e8\uc704\ub85c \ub098\ub204\uc5b4 \ud45c\ud604\ud55c\ub2e4.<\/span>
\uba54\uc77c\uc5d0\uc11c \uc774\ubbf8\uc9c0, \uc624\ub514\uc624 \ud30c\uc77c\uc744 \ubcf4\ub0bc \ub54c \uc774\uc6a9\ud558\ub294 \ucf54\ub529\uc73c\ub85c \ubaa8\ub4e0 \ud50c\ub7ab\ud3fc\uc5d0\uc11c \uc548\ubcf4\uc774\uac70\ub098 \uae68\uc9c0\ub294 \uc77c\uc774 \uc0dd\uae30\uc9c0 \uc54a\ub3c4\ub85d<\/span>
\uacf5\ud1b5\uc73c\ub85c 64\uac1c \uc544\uc2a4\ud0a4 \ucf54\ub4dc\ub97c \uc774\uc6a9\ud558\uc5ec 2\uc9c4 \ub370\uc774\ud130\ub97c \ubcc0\ud658\ud558\uae30 \uc704\ud574 \ubca0\uc774\uc2a4 64\ub97c \uc774\uc6a9\ud55c\ub2e4.<\/span>
\ub530\ub77c\uc11c \ubca0\uc774\uc2a4 64\ub85c \uc778\ucf54\ub529\ud558\uba74 \ud06c\uae30\uac00 33% \ucee4\uc9c4\ub2e4.<\/span><\/p>\n

\uc544\uc8fc \uac04\ub2e8\ud788 \uc0dd\uac01\ud558\uace0\uc2f6\ub2e4\uba74 \ubc14\uc774\ub108\ub9ac \ud30c\uc77c\uc744 \ubb38\uc790\ub85c \ubcc0\ud658\ud558\uc5ec \ubcf4\ub0b4\uace0,<\/span>
\ubb38\uc790\ub85c \ubc1b\uc73c\uba74 \ubc14\uc774\ub108\ub9ac\ub85c \ubcc0\ud658\ud560\uc218 \uc788\ub294 \uc778\ucf54\ub529, \ub514\ucf54\ub529 \ubc29\uc2dd \uc815\ub3c4\ub85c\ub9cc \uc0dd\uac01\ud558\uba74 \uc88b\uaca0\ub2e4.<\/span><\/p>\n

64\uac1c\ub97c \ud45c\ud604\ud558\ub294\ub370\ub294 6\ube44\ud2b8\uac00 \ud544\uc694\ud558\uba70 64\uac1c\uc758 \ubb38\uc790\ub294 \uc544\ub798\uc640 \uac19\ub2e4.<\/span><\/p>\n

ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+\/=<\/span>
(\ub300\ubb38\uc790 A \uac00 0\ubd80\ud130\uc774\uace0 \ub9c8\uc9c0\ub9c9 = \ub294 Padding \ubb38\uc790)<\/span><\/p>\n

\uc0ac\uc6a9\ud558\ub294 \ubb38\uc790\uc5f4\uc758 \uc55e\ub4a4 \uc21c\uc11c\ub294 \uc0c1\uad00\uc5c6\ub2e4. \ub2e4\ub9cc, Encoding\uc5d0 \uc0ac\uc6a9\ud55c \ubb38\uc790\uc21c\uc11c\ub294 Decoding\uc2dc \uc77c\uce58\ud574\uc57c\ub9cc \ud55c\ub2e4.<\/span>
\uc6d0\uce59\uc740 Encoding \ub420 \ubb38\uc790\uc5f4\uc744 6 \ube44\ud2b8\ub85c \ub04a\uc5b4\uc900\ub2e4\ub294 \uac83\uacfc(\uc704\uc758 64\uac1c \ubb38\uc790\ub85c \ud45c\ud604\ud558\uae30 \uc704\ud574\uc11c) Encoding \ub420 \ubb38\uc790\uc5f4\uc758 \ucd1d Bit \uc218\ub97c 3\uc73c\ub85c \ub098\ub208 \ub098\uba38\uc9c0\uc218\ub9cc\ud07c ‘=’ \ub85c Padding \ud55c\ub2e4\ub294 \uac83\uc774\ub2e4.<\/span>\u00a0<\/p>\n

#include<stdio.h>\r\n#include<string.h>\r\n\r\n#define BAD     -1\r\n#define DECODE64(c)  (isascii(c) ? base64val[c] : BAD)\r\n\r\nstatic const char base64digits[] = \"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+\/\";\r\nchar base64val[128];\r\n\r\nvoid main()\r\n{\r\n    char    in_password[20+1], out_password[100+1];\r\n    int    i;\r\n\r\n    for (i=0; i<128; i++) {\r\n        base64val[i] = BAD;\r\n    }\r\n\r\n    for (i=0; i<64; i++) {\r\n        base64val[base64digits[i]] = i;\r\n    }\r\n\r\n    strcpy(in_password, \"ABCDEFGHIJKL1234\");\r\n    memset(out_password, 0x00, sizeof(out_password));\r\n    encode_base64(out_password, in_password, strlen(in_password));\r\n    printf(\"in=(%s), %d, out=(%s), %dn\", \r\n    in_password, strlen(in_password), out_password, strlen(out_password));\r\n\r\n    exit(1);\r\n}\r\n\r\nencode_base64(unsigned char *out, unsigned char *in, int inlen)\r\n{\r\n    for (; inlen >= 3; inlen -= 3)                                      \/\/3\ubc14\uc774\ud2b8\ub97c 6\ube44\ud2b8 \ub2e8\uc704\ub85c \ub04a\uc5b4\uc11c 4\ubc14\uc774\ud2b8\ub85c \ub9cc\ub4ec.\r\n    {              \r\n        *out++ = base64digits[in[0] >> 2];                              \/\/0\ubc88\uc9f8 \uc55e6\uc790\ub9ac\r\n        *out++ = base64digits[((in[0] << 4) &amp; 0x30) | (in[1] >> 4)];    \/\/0\ubc88\uc9f8 \ub4a42\uc790\ub9ac | 1\ubc88\uc9f8 \uc55e4\uc790\ub9ac\r\n        *out++ = base64digits[((in[1] << 2) &amp; 0x3c) | (in[2] >> 6)];    \/\/1\ubc88\uc9f8 \ub4a44\uc790\ub9ac | 2\ubc88\uc9f8 \uc55e2\uc790\ub9ac\r\n        *out++ = base64digits[in[2] &amp; 0x3f];                            \/\/2\ubc88\uc9f8 \ub4a46\uc790\ub9ac\r\n        in += 3;\r\n    }\r\n\r\n    if (inlen > 0)\r\n    {\r\n        unsigned char fragment;\r\n\r\n        *out++ = base64digits[in[0] >> 2];\r\n        fragment = (in[0] << 4) &amp; 0x30;\r\n\r\n        if (inlen > 1)  fragment |= in[1] >> 4;\r\n\r\n        *out++ = base64digits[fragment];\r\n        *out++ = (inlen < 2) ? '=' : base64digits[(in[1] << 2) &amp; 0x3c];\r\n        *out++ = '=';\r\n    }\r\n    *out = '';\r\n}\r\n\r\nint decode_base64(unsigned char *out, unsigned char *in)\r\n{\r\n    int len = 0;\r\n    unsigned char digit1, digit2, digit3, digit4;\r\n\r\n    if (in[0] == '+' &amp;&amp; in[1] == ' ')   in += 2;\r\n    if (*in == 'r') return(0);\r\n\r\n    do {\r\n        digit1 = in[0];\r\n\r\n        if (DECODE64(digit1) == BAD)    return(-1);\r\n\r\n        digit2 = in[1];\r\n\r\n        if (DECODE64(digit2) == BAD)    return(-1);\r\n\r\n        digit3 = in[2];\r\n\r\n        if (digit3 != '=' &amp;&amp; DECODE64(digit3) == BAD)   return(-1); \r\n\r\n        digit4 = in[3];\r\n\r\n        if (digit4 != '=' &amp;&amp; DECODE64(digit4) == BAD)   return(-1);\r\n\r\n        in += 4;\r\n        *out++ = (DECODE64(digit1) << 2) | (DECODE64(digit2) >> 4);\r\n        ++len;\r\n\r\n        if (digit3 != '=')\r\n        {\r\n            *out++ = ((DECODE64(digit2) << 4) &amp; 0xf0) | (DECODE64(digit3) >> 2);\r\n            ++len;\r\n\r\n            if (digit4 != '=')\r\n            {\r\n                *out++ = ((DECODE64(digit3) << 6) &amp; 0xc0) | DECODE64(digit4);\r\n                ++len;\r\n            }\r\n        }\r\n\r\n    } while \r\n\r\n    (*in &amp;&amp; *in != 'r' &amp;&amp; digit4 != '=');\r\n\r\n    return (len);\r\n}<\/pre>\n","protected":false},"excerpt":{"rendered":"
\uc544\ub798 \uc790\ub8cc\ub294 \uc77c\uc790\ub294 \uae30\uc5b5\ub098\uc9c0\uc54a\uc9c0\ub9cc \uc778\ud130\ub137 \uc5b4\ub290\uacf3\uc5d0\uc11c \ud37c\uc654\ub358 \uc790\ub8cc\uc785\ub2c8\ub2e4.\uc77c\ubd80 \uc218\uc815\ud558\uc600\uc73c\uba70 \uc6d0\uae00\uc758 \ucd9c\ucc98\ub97c \uc544\uc2dc\ub294 \ubd84\uc740 \uc54c\ub824\uc8fc\uc2dc\uba74 \uac10\uc0ac \ub4dc\ub9ac\uaca0\uc2b5\ub2c8\ub2e4.   \u203b\uac1c\ub150 2\uc9c4 \ub370\uc774\ud130\ub97c \uc544\uc2a4\ud0a4 \ud14d\uc2a4\ud2b8\ub85c \ubcc0\ud658\ud558\uac70\ub098 \uadf8 \ubc18\ub300\ub85c \ubcc0\ud658\ud558\ub294 \uc778\ucf54\ub529 \ubc29\ubc95. 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