[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 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 00 - 15 */
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| 17 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 16 - 31 */
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| 18 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 32 - 47 */
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[89] | 19 | '0', '0', '0', '0', '0', '0', '0', '0', '0', '0',0x00,0x00,0x00,0x00,0x00,0x00, /* 48 - 63 */
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| 20 | 0x00, 'A', 'A', 'A', 'A', 'A', 'A',0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 64 - 79 */
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[88] | 21 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 80 - 95 */
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[89] | 22 | 0x00, 'a', 'a', 'a', 'a', 'a', 'a',0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 96 - 111 */
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[88] | 23 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 112 - 127 */
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| 24 | /* end of ascii character */
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| 25 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 128 - 143 */
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| 26 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 144 - 159 */
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| 27 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 160 - 175 */
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| 28 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 176 - 191 */
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| 29 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 192 - 207 */
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| 30 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 208 - 223 */
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| 31 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 224 - 239 */
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| 32 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 240 - 255 */
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| 33 | };
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[66] | 34 |
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[88] | 35 | const static char g_table_Base64Encode[] = {
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[90] | 36 | #define BASE64_PADDING_CHAR_INDEX 64
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[88] | 37 | 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', /* 00 - 07 */
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| 38 | 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', /* 08 - 15 */
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| 39 | 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', /* 16 - 23 */
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| 40 | 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', /* 24 - 31 */
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| 41 | 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', /* 32 - 39 */
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| 42 | 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', /* 40 - 47 */
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| 43 | 'w', 'x', 'y', 'z', '0', '1', '2', '3', /* 48 - 55 */
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| 44 | '4', '5', '6', '7', '8', '9', '+', '/', /* 56 - 63 */
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| 45 | '=' /* padding */
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| 46 | };
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[72] | 47 |
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[88] | 48 | const static unsigned char g_ascii_Base64Decode[] = {
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[89] | 49 | 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 00 - 15 */
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| 50 | 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 16 - 31 */
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| 51 | 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, 62,0xff,0xff,0xff, 63, /* 32 - 47 */
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| 52 | 52, 53, 54, 55, 56, 57, 58, 59, 60, 61,0xff,0xff,0xff, 64,0xff,0xff, /* 48 - 63 */
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| 53 | 0xff, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, /* 64 - 79 */
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| 54 | 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,0xff,0xff,0xff,0xff,0xff, /* 80 - 95 */
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| 55 | 0xff, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, /* 96 - 111 */
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| 56 | 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,0xff,0xff,0xff,0xff,0xff, /* 112 - 127 */
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[88] | 57 | /* end of ascii character */
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[89] | 58 | 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 128 - 143 */
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| 59 | 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 144 - 159 */
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| 60 | 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 160 - 175 */
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| 61 | 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 176 - 191 */
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| 62 | 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 192 - 207 */
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| 63 | 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 208 - 223 */
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| 64 | 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 224 - 239 */
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| 65 | 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 240 - 255 */
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[88] | 66 | };
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| 67 |
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| 68 |
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[66] | 69 | /**
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[88] | 70 | * hex-encode
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[66] | 71 | *
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| 72 | * @return 성공 시, CF_OK; 실패 시, 오류 코드
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| 73 | *
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| 74 | * @param bin 바이너리 데이터
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| 75 | * @param len 바이너리 데이터 길이
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| 76 | * @param hex 16진수 문자열을 저장할 주소
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| 77 | *
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[73] | 78 | * @remark
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[91] | 79 | * hex는 할당된 메모리이며, 크기는 '\0'를 제외하고 len * 2
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[66] | 80 | */
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| 81 | int
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[86] | 82 | CF_Codec_Hex_Encode (const unsigned char * bin,
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| 83 | const size_t len,
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| 84 | char * hex)
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[66] | 85 | {
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[88] | 86 | size_t iter = 0;
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| 87 | size_t hexlen = len * 2 + 1;
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[66] | 88 |
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[88] | 89 | const unsigned char * ptr = bin;
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[66] | 90 |
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[88] | 91 | const static char hexchar[] = {'0', '1', '2', '3',
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| 92 | '4', '5', '6', '7',
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| 93 | '8', '9', 'a', 'b',
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| 94 | 'c', 'd', 'e', 'f'};
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[66] | 95 |
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| 96 | ASSERT_ARGS (bin == NULL);
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| 97 | ASSERT_ARGS (hex == NULL);
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| 98 |
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[88] | 99 | for (iter = 0 ; iter < hexlen ; iter += 2, ptr++)
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[66] | 100 | {
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| 101 | hex[iter ] = hexchar[((*(ptr)) >> 4) & 0x0f];
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| 102 | hex[iter + 1] = hexchar[((*(ptr)) ) & 0x0f];
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| 103 | }
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[88] | 104 | hex[hexlen - 1] = '\0';
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[66] | 105 |
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| 106 | return CF_OK;
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| 107 | }
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| 108 |
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| 109 | /**
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[88] | 110 | * hex-decode
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[66] | 111 | *
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[90] | 112 | * @return 성공 시, 디코딩된 바이너리 데이터의 길이; 실패 시, 오류 코드
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[66] | 113 | *
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| 114 | * @param hex 16진수 문자열
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| 115 | * @param bin 바이너리 데이터를 저장할 주소
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| 116 | *
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[73] | 117 | * @remark
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[88] | 118 | * bin는 할당된 메모리이며, 크기는 strlen (hex) / 2
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[66] | 119 | */
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| 120 | int
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[86] | 121 | CF_Codec_Hex_Decode (const char * hex,
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[90] | 122 | unsigned char * bin)
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[66] | 123 | {
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[88] | 124 | size_t length = strlen (hex); /* absolutely even-number */
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[66] | 125 | size_t iter = 0;
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[90] | 126 | int binlen = (int)length / 2;
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[66] | 127 |
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[88] | 128 | const char * ptr = hex;
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| 129 | char buf = 0;
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| 130 | unsigned char val = 0;
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| 131 | unsigned char asciiHex = 0;
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[66] | 132 |
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| 133 | ASSERT_ARGS (hex == NULL);
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| 134 | ASSERT_ARGS (bin == NULL);
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| 135 |
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[88] | 136 | for (iter = 0 ; iter < binlen ; iter++)
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[66] | 137 | {
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[88] | 138 | val = 0; /* init/re-init docoding-buffer */
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[66] | 139 |
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[88] | 140 | /* decode one character */
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| 141 | #define DECODE_HEX(x) \
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| 142 | do { \
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| 143 | buf = *(x); \
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| 144 | val = (unsigned char)(val << 4); \
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| 145 | asciiHex = g_ascii_HexDecode[(int)buf]; \
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| 146 | \
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| 147 | if (buf) \
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| 148 | val |= (unsigned char) \
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[89] | 149 | (buf - asciiHex + (asciiHex == '0' ? 0 : 10)); \
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[88] | 150 | else \
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| 151 | return CF_ERROR_CODEC_NOT_HEXSTRING; \
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| 152 | } while (0)
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[66] | 153 |
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[88] | 154 | /* decode one byte by decode two character */
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| 155 | DECODE_HEX (ptr++);
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| 156 | DECODE_HEX (ptr++);
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| 157 |
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[66] | 158 | bin[iter] = val;
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| 159 | }
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| 160 |
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[90] | 161 | return binlen;
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[66] | 162 | }
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[88] | 163 |
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| 164 | /**
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| 165 | * Base64-encode
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| 166 | *
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| 167 | * @return 성공 시, CF_OK; 실패 시, 오류 코드
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| 168 | *
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| 169 | * @param bin 바이너리 데이터
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| 170 | * @param len 바이너리 데이터 길이
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| 171 | * @param base64 base64 문자열을 저장할 주소
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| 172 | *
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| 173 | * @remark
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[91] | 174 | * base64는 할당된 메모리이며, 크기는 '\0'를 제외하고 ((len + 2) / 3) * 4
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[88] | 175 | */
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| 176 | int
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| 177 | CF_Codec_Base64_Encode (const unsigned char * bin,
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| 178 | const size_t len,
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| 179 | char * base64)
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| 180 | {
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[90] | 181 | const unsigned char * src = bin;
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| 182 | char * dst = base64;
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[88] | 183 |
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[90] | 184 | ASSERT_ARGS (src == NULL);
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| 185 | ASSERT_ARGS (dst == NULL);
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[88] | 186 |
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[90] | 187 | #define SEXTUPLE_E_1(__x) (((__x[0]) >> 2) & 0x3f)
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| 188 | #define SEXTUPLE_E_2(__x) (((__x[0]) << 4) & 0x30)
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| 189 | #define SEXTUPLE_E_3(__x) (((__x[1]) >> 4) & 0x0f)
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| 190 | #define SEXTUPLE_E_4(__x) (((__x[1]) << 2) & 0x3c)
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| 191 | #define SEXTUPLE_E_5(__x) (((__x[2]) >> 6) & 0x03)
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| 192 | #define SEXTUPLE_E_6(__x) (((__x[2]) ) & 0x3f)
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[88] | 193 |
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[90] | 194 | for ( ; src - bin < len - 2 ; src += 3)
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[88] | 195 | {
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[90] | 196 | *dst++ = g_table_Base64Encode[SEXTUPLE_E_1 (src)];
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| 197 | *dst++ = g_table_Base64Encode[SEXTUPLE_E_2 (src)|
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| 198 | SEXTUPLE_E_3 (src)];
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| 199 | *dst++ = g_table_Base64Encode[SEXTUPLE_E_4 (src)|
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| 200 | SEXTUPLE_E_5 (src)];
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| 201 | *dst++ = g_table_Base64Encode[SEXTUPLE_E_6 (src)];
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[88] | 202 | }
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| 203 |
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[90] | 204 | if (src - bin < len)
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[88] | 205 | {
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[90] | 206 | *dst++ = g_table_Base64Encode[SEXTUPLE_E_1 (src)];
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[88] | 207 |
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[90] | 208 | if (src - bin == len - 1)
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[88] | 209 | {
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[91] | 210 | *dst++ = g_table_Base64Encode[SEXTUPLE_E_2 (src)];
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[90] | 211 | *dst++ = g_table_Base64Encode[BASE64_PADDING_CHAR_INDEX];
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[88] | 212 | }
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| 213 | else
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| 214 | {
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[91] | 215 | *dst++ = g_table_Base64Encode[SEXTUPLE_E_2 (src)|
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| 216 | SEXTUPLE_E_3 (src)];
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| 217 | *dst++ = g_table_Base64Encode[SEXTUPLE_E_4 (src)];
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[88] | 218 | }
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| 219 |
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[90] | 220 | *dst++ = g_table_Base64Encode[BASE64_PADDING_CHAR_INDEX];
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[88] | 221 | }
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[90] | 222 | *dst = '\0';
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[88] | 223 |
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| 224 | return CF_OK;
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| 225 | }
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| 226 |
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| 227 | /**
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| 228 | * Base64-decode
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| 229 | *
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[90] | 230 | * @return 성공 시, 디코딩된 바이너리 데이터의 길이; 실패 시, 오류 코드
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[88] | 231 | *
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| 232 | * @param base64 base64 문자열
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| 233 | * @param bin 바이너리 데이터를 저장할 주소
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| 234 | *
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| 235 | * @remark
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[91] | 236 | * base64는 할당된 메모리이며, 크기는 (strlen (base64)) / 4 * 3
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[88] | 237 | */
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| 238 | int
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| 239 | CF_Codec_Base64_Decode (const char * base64,
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[90] | 240 | unsigned char * bin)
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[88] | 241 | {
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| 242 | const char * src = base64;
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| 243 | unsigned char * dst = bin;
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[91] | 244 | int remain = 0;
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[90] | 245 | int binlen = 0;
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[88] | 246 |
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[90] | 247 | ASSERT_ARGS (src == NULL);
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| 248 | ASSERT_ARGS (dst == NULL);
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[88] | 249 |
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[90] | 250 | while (g_ascii_Base64Decode[(int)*src] < BASE64_PADDING_CHAR_INDEX) src++;
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[88] | 251 |
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[91] | 252 | if (*src == 0xff)
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[88] | 253 | return CF_ERROR_CODEC_NOT_BASE64;
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| 254 |
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[90] | 255 | remain = (int)(src - base64);
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[91] | 256 | binlen = ((remain + 2/* max padding length */) / 4) * 3;
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[88] | 257 |
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| 258 | #define SEXTUPLE_D_1(src) (g_ascii_Base64Decode[(int)src[0]] << 2)
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| 259 | #define SEXTUPLE_D_2(src) (g_ascii_Base64Decode[(int)src[1]] >> 4)
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| 260 | #define SEXTUPLE_D_3(src) (g_ascii_Base64Decode[(int)src[1]] << 4)
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| 261 | #define SEXTUPLE_D_4(src) (g_ascii_Base64Decode[(int)src[2]] >> 2)
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| 262 | #define SEXTUPLE_D_5(src) (g_ascii_Base64Decode[(int)src[2]] << 6)
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| 263 | #define SEXTUPLE_D_6(src) (g_ascii_Base64Decode[(int)src[3]] )
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| 264 |
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[91] | 265 | for (src = base64 ; remain > 4 ; remain -= 4, src += 4)
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[88] | 266 | {
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| 267 | *dst++ = (unsigned char)(SEXTUPLE_D_1 (src) | SEXTUPLE_D_2 (src));
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| 268 | *dst++ = (unsigned char)(SEXTUPLE_D_3 (src) | SEXTUPLE_D_4 (src));
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| 269 | *dst++ = (unsigned char)(SEXTUPLE_D_5 (src) | SEXTUPLE_D_6 (src));
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| 270 | }
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| 271 |
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| 272 | if (remain > 1)
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| 273 | *dst++ = (unsigned char)(SEXTUPLE_D_1 (src) | SEXTUPLE_D_2 (src));
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| 274 | if (remain > 2)
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| 275 | *dst++ = (unsigned char)(SEXTUPLE_D_3 (src) | SEXTUPLE_D_4 (src));
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| 276 | if (remain > 3)
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| 277 | *dst++ = (unsigned char)(SEXTUPLE_D_5 (src) | SEXTUPLE_D_6 (src));
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| 278 |
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[92] | 279 | return binlen - (4 - remain);
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[88] | 280 | }
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