[66] | 1 | /**
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| 2 | * @file cf_codec.c
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| 3 | * @author myusgun <myusgun@gmail.com>
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| 4 | */
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| 5 | #include "cf_codec.h"
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| 6 | #include "cf_error.h"
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| 7 |
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| 8 | #include <string.h>
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| 9 | #include <stdio.h>
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| 10 |
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[85] | 11 | #define ASSERT_ARGS(x) \
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| 12 | if ((x)) \
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[66] | 13 | return CF_ERROR_CODEC_INVALID_ARGS
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| 14 |
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[88] | 15 | const static unsigned char g_ascii_HexDecode[] = {
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| 16 | #define ASCN '0' /* ascii number */
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| 17 | #define ASCU 'A' /* ascii upper */
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| 18 | #define ASCL 'a' /* ascii lower */
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| 19 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 00 - 15 */
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| 20 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 16 - 31 */
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| 21 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 32 - 47 */
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| 22 | ASCN,ASCN,ASCN,ASCN,ASCN,ASCN,ASCN,ASCN,ASCN,ASCN,0x00,0x00,0x00,0x00,0x00,0x00, /* 48 - 63 */
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| 23 | 0x00,ASCU,ASCU,ASCU,ASCU,ASCU,ASCU,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 64 - 79 */
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| 24 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 80 - 95 */
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| 25 | 0x00,ASCL,ASCL,ASCL,ASCL,ASCL,ASCL,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 96 - 111 */
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| 26 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 112 - 127 */
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| 27 | /* end of ascii character */
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| 28 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 128 - 143 */
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| 29 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 144 - 159 */
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| 30 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 160 - 175 */
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| 31 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 176 - 191 */
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| 32 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 192 - 207 */
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| 33 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 208 - 223 */
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| 34 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 224 - 239 */
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| 35 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 240 - 255 */
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| 36 | };
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[66] | 37 |
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[88] | 38 | const static char g_table_Base64Encode[] = {
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| 39 | #define PADDING_CHAR_INDEX 64
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| 40 | 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', /* 00 - 07 */
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| 41 | 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', /* 08 - 15 */
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| 42 | 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', /* 16 - 23 */
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| 43 | 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', /* 24 - 31 */
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| 44 | 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', /* 32 - 39 */
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| 45 | 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', /* 40 - 47 */
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| 46 | 'w', 'x', 'y', 'z', '0', '1', '2', '3', /* 48 - 55 */
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| 47 | '4', '5', '6', '7', '8', '9', '+', '/', /* 56 - 63 */
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| 48 | '=' /* padding */
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| 49 | };
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[72] | 50 |
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[88] | 51 | const static unsigned char g_ascii_Base64Decode[] = {
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| 52 | 99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99, /* 00 - 15 */
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| 53 | 99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99, /* 16 - 31 */
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| 54 | 99,99,99,99,99,99,99,99,99,99,99,62,99,99,99,63, /* 32 - 47 */
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| 55 | 52,53,54,55,56,57,58,59,60,61,99,99,99,64,99,99, /* 48 - 63 */
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| 56 | 99, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14, /* 64 - 79 */
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| 57 | 15,16,17,18,19,20,21,22,23,24,25,99,99,99,99,99, /* 80 - 95 */
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| 58 | 99,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40, /* 96 - 111 */
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| 59 | 41,42,43,44,45,46,47,48,49,50,51,99,99,99,99,99, /* 112 - 127 */
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| 60 | /* end of ascii character */
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| 61 | 99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99, /* 128 - 143 */
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| 62 | 99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99, /* 144 - 159 */
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| 63 | 99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99, /* 160 - 175 */
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| 64 | 99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99, /* 176 - 191 */
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| 65 | 99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99, /* 192 - 207 */
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| 66 | 99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99, /* 208 - 223 */
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| 67 | 99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99, /* 224 - 239 */
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| 68 | 99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99, /* 240 - 255 */
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| 69 | };
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| 70 |
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| 71 |
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[66] | 72 | /**
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[88] | 73 | * hex-encode
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[66] | 74 | *
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| 75 | * @return 성공 시, CF_OK; 실패 시, 오류 코드
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| 76 | *
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| 77 | * @param bin 바이너리 데이터
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| 78 | * @param len 바이너리 데이터 길이
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| 79 | * @param hex 16진수 문자열을 저장할 주소
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| 80 | *
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[73] | 81 | * @remark
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[88] | 82 | * hex는 할당된 메모리이며, 크기는 '\0'를 포함하여 len * 2 + 1
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[66] | 83 | */
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| 84 | int
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[86] | 85 | CF_Codec_Hex_Encode (const unsigned char * bin,
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| 86 | const size_t len,
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| 87 | char * hex)
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[66] | 88 | {
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[88] | 89 | size_t iter = 0;
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| 90 | size_t hexlen = len * 2 + 1;
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[66] | 91 |
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[88] | 92 | const unsigned char * ptr = bin;
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[66] | 93 |
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[88] | 94 | const static char hexchar[] = {'0', '1', '2', '3',
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| 95 | '4', '5', '6', '7',
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| 96 | '8', '9', 'a', 'b',
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| 97 | 'c', 'd', 'e', 'f'};
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[66] | 98 |
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| 99 | ASSERT_ARGS (bin == NULL);
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| 100 | ASSERT_ARGS (hex == NULL);
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| 101 |
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[88] | 102 | for (iter = 0 ; iter < hexlen ; iter += 2, ptr++)
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[66] | 103 | {
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| 104 | hex[iter ] = hexchar[((*(ptr)) >> 4) & 0x0f];
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| 105 | hex[iter + 1] = hexchar[((*(ptr)) ) & 0x0f];
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| 106 | }
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[88] | 107 | hex[hexlen - 1] = '\0';
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[66] | 108 |
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| 109 | return CF_OK;
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| 110 | }
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| 111 |
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| 112 | /**
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[88] | 113 | * hex-decode
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[66] | 114 | *
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| 115 | * @return 성공 시, CF_OK; 실패 시, 오류 코드
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| 116 | *
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| 117 | * @param hex 16진수 문자열
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| 118 | * @param bin 바이너리 데이터를 저장할 주소
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| 119 | * @param len 바이너리 데이터의 길이를 저장할 주소
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| 120 | *
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[73] | 121 | * @remark
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[88] | 122 | * bin는 할당된 메모리이며, 크기는 strlen (hex) / 2
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[66] | 123 | */
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| 124 | int
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[86] | 125 | CF_Codec_Hex_Decode (const char * hex,
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| 126 | unsigned char * bin,
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| 127 | size_t * len)
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[66] | 128 | {
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| 129 | int result = 0;
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| 130 |
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[88] | 131 | size_t length = strlen (hex); /* absolutely even-number */
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[66] | 132 | size_t iter = 0;
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[88] | 133 | size_t binlen = length / 2;
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[66] | 134 |
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[88] | 135 | const char * ptr = hex;
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| 136 | char buf = 0;
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| 137 | unsigned char val = 0;
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| 138 | unsigned char asciiHex = 0;
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[66] | 139 |
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| 140 | ASSERT_ARGS (hex == NULL);
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| 141 | ASSERT_ARGS (bin == NULL);
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| 142 | ASSERT_ARGS (len == NULL);
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| 143 |
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[88] | 144 | for (iter = 0 ; iter < binlen ; iter++)
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[66] | 145 | {
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[88] | 146 | val = 0; /* init/re-init docoding-buffer */
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[66] | 147 |
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[88] | 148 | /* decode one character */
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| 149 | #define DECODE_HEX(x) \
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| 150 | do { \
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| 151 | buf = *(x); \
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| 152 | val = (unsigned char)(val << 4); \
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| 153 | asciiHex = g_ascii_HexDecode[(int)buf]; \
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| 154 | \
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| 155 | if (buf) \
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| 156 | val |= (unsigned char) \
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| 157 | (buf - asciiHex + (asciiHex == ASCN ? 0 : 10)); \
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| 158 | else \
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| 159 | return CF_ERROR_CODEC_NOT_HEXSTRING; \
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| 160 | } while (0)
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[66] | 161 |
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[88] | 162 | /* decode one byte by decode two character */
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| 163 | DECODE_HEX (ptr++);
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| 164 | DECODE_HEX (ptr++);
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| 165 |
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[66] | 166 | bin[iter] = val;
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| 167 | }
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| 168 |
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[88] | 169 | *len = binlen;
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[66] | 170 |
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| 171 | return result;
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| 172 | }
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[88] | 173 |
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| 174 | /**
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| 175 | * Base64-encode
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| 176 | *
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| 177 | * @return 성공 시, CF_OK; 실패 시, 오류 코드
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| 178 | *
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| 179 | * @param bin 바이너리 데이터
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| 180 | * @param len 바이너리 데이터 길이
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| 181 | * @param base64 base64 문자열을 저장할 주소
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| 182 | *
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| 183 | * @remark
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| 184 | * base64는 할당된 메모리이며, 크기는 '\0'를 포함하여 (((len + 2) / 3) * 4) + 1
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| 185 | *
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| 186 | * @see http://sourceforge.net/p/predef/wiki/Endianness/
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| 187 | */
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| 188 | int
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| 189 | CF_Codec_Base64_Encode (const unsigned char * bin,
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| 190 | const size_t len,
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| 191 | char * base64)
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| 192 | {
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| 193 | size_t iter = 0;
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| 194 | char * ptr = base64;
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| 195 |
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| 196 | ASSERT_ARGS (bin == NULL);
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| 197 | ASSERT_ARGS (base64 == NULL);
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| 198 |
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| 199 | #define SEXTUPLE_E_1(__x,_idx) ((__x[_idx ] >> 2) & 0x3f)
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| 200 | #define SEXTUPLE_E_2(__x,_idx) ((__x[_idx ] << 4) & 0x30)
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| 201 | #define SEXTUPLE_E_3(__x,_idx) ((__x[_idx + 1] >> 4) & 0x0f)
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| 202 | #define SEXTUPLE_E_4(__x,_idx) ((__x[_idx + 1] << 2) & 0x3c)
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| 203 | #define SEXTUPLE_E_5(__x,_idx) ((__x[_idx + 2] >> 6) & 0x03)
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| 204 | #define SEXTUPLE_E_6(__x,_idx) ((__x[_idx + 2] ) & 0x3f)
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| 205 |
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| 206 | for (iter = 0 ; iter < len - 2 ; iter += 3)
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| 207 | {
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| 208 | *ptr++ = g_table_Base64Encode[SEXTUPLE_E_1 (bin, iter)];
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| 209 | *ptr++ = g_table_Base64Encode[SEXTUPLE_E_2 (bin, iter)|
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| 210 | SEXTUPLE_E_3 (bin, iter)];
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| 211 | *ptr++ = g_table_Base64Encode[SEXTUPLE_E_4 (bin, iter)|
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| 212 | SEXTUPLE_E_5 (bin, iter)];
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| 213 | *ptr++ = g_table_Base64Encode[SEXTUPLE_E_6 (bin, iter)];
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| 214 | }
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| 215 |
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| 216 | if (iter < len)
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| 217 | {
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| 218 | *ptr++ = g_table_Base64Encode[SEXTUPLE_E_1 (bin, iter)];
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| 219 |
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| 220 | if (iter == (len - 1))
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| 221 | {
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| 222 | *ptr++ = g_table_Base64Encode[SEXTUPLE_E_2 (bin, iter)];
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| 223 | *ptr++ = g_table_Base64Encode[PADDING_CHAR_INDEX];
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| 224 | }
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| 225 | else
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| 226 | {
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| 227 | *ptr++ = g_table_Base64Encode[SEXTUPLE_E_2 (bin, iter)|
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| 228 | SEXTUPLE_E_3 (bin, iter)];
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| 229 | *ptr++ = g_table_Base64Encode[SEXTUPLE_E_4 (bin, iter)];
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| 230 | }
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| 231 |
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| 232 | *ptr++ = g_table_Base64Encode[PADDING_CHAR_INDEX];
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| 233 | }
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| 234 | *ptr = '\0';
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| 235 |
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| 236 | return CF_OK;
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| 237 | }
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| 238 |
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| 239 | /**
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| 240 | * Base64-decode
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| 241 | *
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| 242 | * @return 성공 시, CF_OK; 실패 시, 오류 코드
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| 243 | *
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| 244 | * @param base64 base64 문자열
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| 245 | * @param bin 바이너리 데이터를 저장할 주소
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| 246 | * @param len 바이너리 데이터의 길이를 저장할 주소
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| 247 | *
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| 248 | * @remark
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| 249 | * base64는 할당된 메모리이며, 크기는 (strlen (base64) - <'=' 개수>) / 4 * 3
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| 250 | *
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| 251 | * @see http://sourceforge.net/p/predef/wiki/Endianness/
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| 252 | */
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| 253 | int
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| 254 | CF_Codec_Base64_Decode (const char * base64,
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| 255 | unsigned char * bin,
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| 256 | size_t * len)
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| 257 | {
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| 258 | size_t remain = 0;
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| 259 | const char * src = base64;
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| 260 | unsigned char * dst = bin;
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| 261 | size_t binlen = 0;
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| 262 |
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| 263 | ASSERT_ARGS (base64 == NULL);
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| 264 | ASSERT_ARGS (bin == NULL);
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| 265 | ASSERT_ARGS (len == NULL);
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| 266 |
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| 267 | while (*src && g_ascii_Base64Decode[(int)*src] < PADDING_CHAR_INDEX) src++;
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| 268 |
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| 269 | if (*src)
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| 270 | return CF_ERROR_CODEC_NOT_BASE64;
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| 271 |
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| 272 | remain = (size_t)(src - base64);
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| 273 | binlen = ((remain + 3) / 4) * 3;
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| 274 |
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| 275 | #define SEXTUPLE_D_1(src) (g_ascii_Base64Decode[(int)src[0]] << 2)
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| 276 | #define SEXTUPLE_D_2(src) (g_ascii_Base64Decode[(int)src[1]] >> 4)
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| 277 | #define SEXTUPLE_D_3(src) (g_ascii_Base64Decode[(int)src[1]] << 4)
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| 278 | #define SEXTUPLE_D_4(src) (g_ascii_Base64Decode[(int)src[2]] >> 2)
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| 279 | #define SEXTUPLE_D_5(src) (g_ascii_Base64Decode[(int)src[2]] << 6)
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| 280 | #define SEXTUPLE_D_6(src) (g_ascii_Base64Decode[(int)src[3]] )
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| 281 |
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| 282 | for (src = base64, dst = bin ; remain > 4 ; remain -= 4, src += 4)
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| 283 | {
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| 284 | *dst++ = (unsigned char)(SEXTUPLE_D_1 (src) | SEXTUPLE_D_2 (src));
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| 285 | *dst++ = (unsigned char)(SEXTUPLE_D_3 (src) | SEXTUPLE_D_4 (src));
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| 286 | *dst++ = (unsigned char)(SEXTUPLE_D_5 (src) | SEXTUPLE_D_6 (src));
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| 287 | }
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| 288 |
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| 289 | if (remain > 1)
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| 290 | *dst++ = (unsigned char)(SEXTUPLE_D_1 (src) | SEXTUPLE_D_2 (src));
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| 291 |
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| 292 | if (remain > 2)
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| 293 | *dst++ = (unsigned char)(SEXTUPLE_D_3 (src) | SEXTUPLE_D_4 (src));
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| 294 |
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| 295 | if (remain > 3)
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| 296 | *dst++ = (unsigned char)(SEXTUPLE_D_5 (src) | SEXTUPLE_D_6 (src));
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| 297 |
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| 298 | *dst++ = '\0';
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| 299 | *len = binlen;
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| 300 |
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| 301 | return CF_OK;
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| 302 | }
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