source: libcf/trunk/src/cf_codec.c@ 116

Last change on this file since 116 was 116, checked in by cheese, 11 years ago

#1 fix and arrange doxygen comments
File size: 9.7 KB
Line 
1/**
2 * @file cf_codec.c
3 * @author myusgun <myusgun@gmail.com>
4 */
5#include "cf_codec.h"
6#include "cf_error.h"
7
8#include <string.h>
9#include <stdio.h>
10
11#define ASSERT_ARGS(x) \
12 if ((x)) \
13 return CF_ERROR_CODEC_INVALID_ARGS
14
15const static unsigned char g_ascii_HexDecode[] = {
16 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 00 - 15 */
17 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 16 - 31 */
18 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 32 - 47 */
19 '0', '0', '0', '0', '0', '0', '0', '0', '0', '0',0x00,0x00,0x00,0x00,0x00,0x00, /* 48 - 63 */
20 0x00, 'A', 'A', 'A', 'A', 'A', 'A',0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 64 - 79 */
21 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 80 - 95 */
22 0x00, 'a', 'a', 'a', 'a', 'a', 'a',0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 96 - 111 */
23 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 112 - 127 */
24 /* end of ascii character */
25 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 128 - 143 */
26 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 144 - 159 */
27 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 160 - 175 */
28 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 176 - 191 */
29 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 192 - 207 */
30 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 208 - 223 */
31 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 224 - 239 */
32 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 240 - 255 */
33};
34
35const static char g_table_Base64Encode[] = {
36#define BASE64_PADDING_CHAR_INDEX 64
37 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', /* 00 - 07 */
38 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', /* 08 - 15 */
39 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', /* 16 - 23 */
40 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', /* 24 - 31 */
41 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', /* 32 - 39 */
42 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', /* 40 - 47 */
43 'w', 'x', 'y', 'z', '0', '1', '2', '3', /* 48 - 55 */
44 '4', '5', '6', '7', '8', '9', '+', '/', /* 56 - 63 */
45 '=' /* padding */
46};
47
48const static unsigned char g_ascii_Base64Decode[] = {
49 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 00 - 15 */
50 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 16 - 31 */
51 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, 62,0xff,0xff,0xff, 63, /* 32 - 47 */
52 52, 53, 54, 55, 56, 57, 58, 59, 60, 61,0xff,0xff,0xff, 64,0xff,0xff, /* 48 - 63 */
53 0xff, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, /* 64 - 79 */
54 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,0xff,0xff,0xff,0xff,0xff, /* 80 - 95 */
55 0xff, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, /* 96 - 111 */
56 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,0xff,0xff,0xff,0xff,0xff, /* 112 - 127 */
57 /* end of ascii character */
58 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 128 - 143 */
59 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 144 - 159 */
60 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 160 - 175 */
61 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 176 - 191 */
62 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 192 - 207 */
63 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 208 - 223 */
64 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 224 - 239 */
65 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 240 - 255 */
66};
67
68
69/**
70 * hex-encode
71 *
72 * @return 성공 시, CF_OK; 실패 시, 오류 코드
73 *
74 * @param bin 바이너리 데이터
75 * @param len 바이너리 데이터의 길이
76 * @param hex 16진수 문자열을 저장할 주소
77 *
78 * @remarks
79 * hex는 할당된 메모리이며, 크기는 '\0'를 제외하고 len * 2
80 */
81int
82CF_Codec_Hex_Encode (const unsigned char * bin,
83 const size_t len,
84 char * hex)
85{
86 size_t iter = 0;
87 size_t hexlen = len * 2 + 1;
88
89 const unsigned char * ptr = bin;
90
91 const static char hexchar[] = {'0', '1', '2', '3',
92 '4', '5', '6', '7',
93 '8', '9', 'a', 'b',
94 'c', 'd', 'e', 'f'};
95
96 ASSERT_ARGS (bin == NULL);
97 ASSERT_ARGS (hex == NULL);
98
99 for (iter = 0 ; iter < hexlen ; iter += 2, ptr++)
100 {
101 hex[iter ] = hexchar[((*(ptr)) >> 4) & 0x0f];
102 hex[iter + 1] = hexchar[((*(ptr)) ) & 0x0f];
103 }
104 hex[hexlen - 1] = '\0';
105
106 return CF_OK;
107}
108
109/**
110 * hex-decode
111 *
112 * @return 성공 시, 디코딩된 바이너리 데이터의 길이; 실패 시, 오류 코드
113 *
114 * @param hex 16진수 문자열
115 * @param bin 바이너리 데이터를 저장할 주소
116 * @param len 바이너리 데이터의 길이를 저장할 주소
117 *
118 * @remarks
119 * bin는 할당된 메모리이며, 크기는 strlen (hex) / 2
120 */
121int
122CF_Codec_Hex_Decode (const char * hex,
123 unsigned char * bin,
124 size_t * len)
125{
126 size_t length = 0; /* absolutely even-number */
127 size_t iter = 0;
128 size_t binlen = 0;
129
130 const char * ptr = hex;
131 char buf = 0;
132 unsigned char val = 0;
133 unsigned char asciiHex = 0;
134
135 ASSERT_ARGS (hex == NULL);
136 ASSERT_ARGS (bin == NULL);
137 ASSERT_ARGS (len == NULL);
138
139 *len = 0;
140
141 for ( ; g_ascii_HexDecode[(int)*ptr] && *ptr ; ptr++, length++);
142
143 if (*ptr)
144 return CF_ERROR_CODEC_NOT_HEXSTRING;
145
146 binlen = length / 2;
147
148 for (iter = 0, ptr = hex ; *ptr ; iter++)
149 {
150 val = 0; /* init/re-init docoding-buffer */
151
152 /* decode one character */
153#define DECODE_HEX(x) \
154 do { \
155 buf = *(x); \
156 val = (unsigned char)(val << 4); \
157 asciiHex = g_ascii_HexDecode[(int)buf]; \
158 \
159 val |= (unsigned char) \
160 (buf - asciiHex + (asciiHex == '0' ? 0 : 10)); \
161 } while (0)
162
163 /* decode one byte by decode two character */
164 DECODE_HEX (ptr++);
165 DECODE_HEX (ptr++);
166
167 bin[iter] = val;
168 }
169
170 * len = binlen;
171
172 return CF_OK;
173}
174
175/**
176 * Base64-encode
177 *
178 * @return 성공 시, CF_OK; 실패 시, 오류 코드
179 *
180 * @param bin 바이너리 데이터
181 * @param len 바이너리 데이터 길이
182 * @param base64 base64 문자열을 저장할 주소
183 *
184 * @remarks
185 * base64는 할당된 메모리이며, 크기는 '\0'를 제외하고 ((len + 2) / 3) * 4
186 */
187int
188CF_Codec_Base64_Encode (const unsigned char * bin,
189 const size_t len,
190 char * base64)
191{
192 const unsigned char * src = bin;
193 char * dst = base64;
194
195 ASSERT_ARGS (src == NULL);
196 ASSERT_ARGS (dst == NULL);
197
198#define SEXTUPLE_E_1(__x) (((__x[0]) >> 2) & 0x3f)
199#define SEXTUPLE_E_2(__x) (((__x[0]) << 4) & 0x30)
200#define SEXTUPLE_E_3(__x) (((__x[1]) >> 4) & 0x0f)
201#define SEXTUPLE_E_4(__x) (((__x[1]) << 2) & 0x3c)
202#define SEXTUPLE_E_5(__x) (((__x[2]) >> 6) & 0x03)
203#define SEXTUPLE_E_6(__x) (((__x[2]) ) & 0x3f)
204
205 for ( ; src - bin < len - 2 ; src += 3)
206 {
207 *dst++ = g_table_Base64Encode[SEXTUPLE_E_1 (src)];
208 *dst++ = g_table_Base64Encode[SEXTUPLE_E_2 (src)|
209 SEXTUPLE_E_3 (src)];
210 *dst++ = g_table_Base64Encode[SEXTUPLE_E_4 (src)|
211 SEXTUPLE_E_5 (src)];
212 *dst++ = g_table_Base64Encode[SEXTUPLE_E_6 (src)];
213 }
214
215 if (src - bin < len)
216 {
217 *dst++ = g_table_Base64Encode[SEXTUPLE_E_1 (src)];
218
219 if (src - bin == len - 1)
220 {
221 *dst++ = g_table_Base64Encode[SEXTUPLE_E_2 (src)];
222 *dst++ = g_table_Base64Encode[BASE64_PADDING_CHAR_INDEX];
223 }
224 else
225 {
226 *dst++ = g_table_Base64Encode[SEXTUPLE_E_2 (src)|
227 SEXTUPLE_E_3 (src)];
228 *dst++ = g_table_Base64Encode[SEXTUPLE_E_4 (src)];
229 }
230
231 *dst++ = g_table_Base64Encode[BASE64_PADDING_CHAR_INDEX];
232 }
233 *dst = '\0';
234
235 return CF_OK;
236}
237
238/**
239 * Base64-decode
240 *
241 * @return 성공 시, 디코딩된 바이너리 데이터의 길이; 실패 시, 오류 코드
242 *
243 * @param base64 base64 문자열
244 * @param bin 바이너리 데이터를 저장할 주소
245 * @param len 바이너리 데이터의 길이를 저장할 주소
246 *
247 * @remarks
248 * base64는 할당된 메모리이며, 크기는 (strlen (base64)) / 4 * 3
249 */
250int
251CF_Codec_Base64_Decode (const char * base64,
252 unsigned char * bin,
253 size_t * len)
254{
255 const char * src = base64;
256 unsigned char * dst = bin;
257 int remain = 0;
258 int binlen = 0;
259
260 ASSERT_ARGS (src == NULL);
261 ASSERT_ARGS (dst == NULL);
262 ASSERT_ARGS (len == NULL);
263
264 *len = 0;
265
266 while (g_ascii_Base64Decode[(int)*src] < BASE64_PADDING_CHAR_INDEX) src++;
267
268 if (*src == 0xff)
269 return CF_ERROR_CODEC_NOT_BASE64;
270
271 remain = (int)(src - base64);
272 binlen = ((remain + 2/* max padding length */) / 4) * 3;
273
274#define SEXTUPLE_D_1(src) (g_ascii_Base64Decode[(int)src[0]] << 2)
275#define SEXTUPLE_D_2(src) (g_ascii_Base64Decode[(int)src[1]] >> 4)
276#define SEXTUPLE_D_3(src) (g_ascii_Base64Decode[(int)src[1]] << 4)
277#define SEXTUPLE_D_4(src) (g_ascii_Base64Decode[(int)src[2]] >> 2)
278#define SEXTUPLE_D_5(src) (g_ascii_Base64Decode[(int)src[2]] << 6)
279#define SEXTUPLE_D_6(src) (g_ascii_Base64Decode[(int)src[3]] )
280
281 for (src = base64 ; remain > 4 ; remain -= 4, src += 4)
282 {
283 *dst++ = (unsigned char)(SEXTUPLE_D_1 (src) | SEXTUPLE_D_2 (src));
284 *dst++ = (unsigned char)(SEXTUPLE_D_3 (src) | SEXTUPLE_D_4 (src));
285 *dst++ = (unsigned char)(SEXTUPLE_D_5 (src) | SEXTUPLE_D_6 (src));
286 }
287
288 if (remain > 1)
289 *dst++ = (unsigned char)(SEXTUPLE_D_1 (src) | SEXTUPLE_D_2 (src));
290 if (remain > 2)
291 *dst++ = (unsigned char)(SEXTUPLE_D_3 (src) | SEXTUPLE_D_4 (src));
292 if (remain > 3)
293 *dst++ = (unsigned char)(SEXTUPLE_D_5 (src) | SEXTUPLE_D_6 (src));
294
295 return binlen - (4 - remain);
296}
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