source: UsbWattMeter/trunk/curl-7.47.1/lib/base64.c@ 164

Last change on this file since 164 was 164, checked in by coas-nagasima, 6 years ago

TOPPERS/ECNLサンプルアプリ「USB充電器電力計」を追加

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  • Property svn:mime-type set to text/x-csrc
File size: 8.2 KB
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1/***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.haxx.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 ***************************************************************************/
22
23/* Base64 encoding/decoding */
24
25#include "curl_setup.h"
26#include "curl_printf.h"
27#include "urldata.h" /* for the SessionHandle definition */
28#include "warnless.h"
29#include "curl_base64.h"
30#include "non-ascii.h"
31
32/* The last #include files should be: */
33#include "curl_memory.h"
34#include "memdebug.h"
35
36/* ---- Base64 Encoding/Decoding Table --- */
37static const char base64[]=
38 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
39
40/* The Base 64 encoding with an URL and filename safe alphabet, RFC 4648
41 section 5 */
42static const char base64url[]=
43 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
44
45static size_t decodeQuantum(unsigned char *dest, const char *src)
46{
47 size_t padding = 0;
48 const char *s, *p;
49 unsigned long i, x = 0;
50
51 for(i = 0, s = src; i < 4; i++, s++) {
52 unsigned long v = 0;
53
54 if(*s == '=') {
55 x = (x << 6);
56 padding++;
57 }
58 else {
59 p = base64;
60
61 while(*p && (*p != *s)) {
62 v++;
63 p++;
64 }
65
66 if(*p == *s)
67 x = (x << 6) + v;
68 else
69 return 0;
70 }
71 }
72
73 if(padding < 1)
74 dest[2] = curlx_ultouc(x & 0xFFUL);
75
76 x >>= 8;
77 if(padding < 2)
78 dest[1] = curlx_ultouc(x & 0xFFUL);
79
80 x >>= 8;
81 dest[0] = curlx_ultouc(x & 0xFFUL);
82
83 return 3 - padding;
84}
85
86/*
87 * Curl_base64_decode()
88 *
89 * Given a base64 NUL-terminated string at src, decode it and return a
90 * pointer in *outptr to a newly allocated memory area holding decoded
91 * data. Size of decoded data is returned in variable pointed by outlen.
92 *
93 * Returns CURLE_OK on success, otherwise specific error code. Function
94 * output shall not be considered valid unless CURLE_OK is returned.
95 *
96 * When decoded data length is 0, returns NULL in *outptr.
97 *
98 * @unittest: 1302
99 */
100CURLcode Curl_base64_decode(const char *src,
101 unsigned char **outptr, size_t *outlen)
102{
103 size_t srclen = 0;
104 size_t length = 0;
105 size_t padding = 0;
106 size_t i;
107 size_t numQuantums;
108 size_t rawlen = 0;
109 unsigned char *pos;
110 unsigned char *newstr;
111
112 *outptr = NULL;
113 *outlen = 0;
114 srclen = strlen(src);
115
116 /* Check the length of the input string is valid */
117 if(!srclen || srclen % 4)
118 return CURLE_BAD_CONTENT_ENCODING;
119
120 /* Find the position of any = padding characters */
121 while((src[length] != '=') && src[length])
122 length++;
123
124 /* A maximum of two = padding characters is allowed */
125 if(src[length] == '=') {
126 padding++;
127 if(src[length + 1] == '=')
128 padding++;
129 }
130
131 /* Check the = padding characters weren't part way through the input */
132 if(length + padding != srclen)
133 return CURLE_BAD_CONTENT_ENCODING;
134
135 /* Calculate the number of quantums */
136 numQuantums = srclen / 4;
137
138 /* Calculate the size of the decoded string */
139 rawlen = (numQuantums * 3) - padding;
140
141 /* Allocate our buffer including room for a zero terminator */
142 newstr = malloc(rawlen + 1);
143 if(!newstr)
144 return CURLE_OUT_OF_MEMORY;
145
146 pos = newstr;
147
148 /* Decode the quantums */
149 for(i = 0; i < numQuantums; i++) {
150 size_t result = decodeQuantum(pos, src);
151 if(!result) {
152 free(newstr);
153
154 return CURLE_BAD_CONTENT_ENCODING;
155 }
156
157 pos += result;
158 src += 4;
159 }
160
161 /* Zero terminate */
162 *pos = '\0';
163
164 /* Return the decoded data */
165 *outptr = newstr;
166 *outlen = rawlen;
167
168 return CURLE_OK;
169}
170
171static CURLcode base64_encode(const char *table64,
172 struct SessionHandle *data,
173 const char *inputbuff, size_t insize,
174 char **outptr, size_t *outlen)
175{
176 CURLcode error;
177 unsigned char ibuf[3];
178 unsigned char obuf[4];
179 int i;
180 int inputparts;
181 char *output;
182 char *base64data;
183 char *convbuf = NULL;
184
185 const char *indata = inputbuff;
186
187 *outptr = NULL;
188 *outlen = 0;
189
190 if(0 == insize)
191 insize = strlen(indata);
192
193 base64data = output = malloc(insize*4/3+4);
194 if(NULL == output)
195 return CURLE_OUT_OF_MEMORY;
196
197 /*
198 * The base64 data needs to be created using the network encoding
199 * not the host encoding. And we can't change the actual input
200 * so we copy it to a buffer, translate it, and use that instead.
201 */
202 error = Curl_convert_clone(data, indata, insize, &convbuf);
203 if(error) {
204 free(output);
205 return error;
206 }
207
208 if(convbuf)
209 indata = (char *)convbuf;
210
211 while(insize > 0) {
212 for(i = inputparts = 0; i < 3; i++) {
213 if(insize > 0) {
214 inputparts++;
215 ibuf[i] = (unsigned char) *indata;
216 indata++;
217 insize--;
218 }
219 else
220 ibuf[i] = 0;
221 }
222
223 obuf[0] = (unsigned char) ((ibuf[0] & 0xFC) >> 2);
224 obuf[1] = (unsigned char) (((ibuf[0] & 0x03) << 4) | \
225 ((ibuf[1] & 0xF0) >> 4));
226 obuf[2] = (unsigned char) (((ibuf[1] & 0x0F) << 2) | \
227 ((ibuf[2] & 0xC0) >> 6));
228 obuf[3] = (unsigned char) (ibuf[2] & 0x3F);
229
230 switch(inputparts) {
231 case 1: /* only one byte read */
232 snprintf(output, 5, "%c%c==",
233 table64[obuf[0]],
234 table64[obuf[1]]);
235 break;
236 case 2: /* two bytes read */
237 snprintf(output, 5, "%c%c%c=",
238 table64[obuf[0]],
239 table64[obuf[1]],
240 table64[obuf[2]]);
241 break;
242 default:
243 snprintf(output, 5, "%c%c%c%c",
244 table64[obuf[0]],
245 table64[obuf[1]],
246 table64[obuf[2]],
247 table64[obuf[3]] );
248 break;
249 }
250 output += 4;
251 }
252 *output = '\0';
253 *outptr = base64data; /* return pointer to new data, allocated memory */
254
255 free(convbuf);
256
257 *outlen = strlen(base64data); /* return the length of the new data */
258
259 return CURLE_OK;
260}
261
262/*
263 * Curl_base64_encode()
264 *
265 * Given a pointer to an input buffer and an input size, encode it and
266 * return a pointer in *outptr to a newly allocated memory area holding
267 * encoded data. Size of encoded data is returned in variable pointed by
268 * outlen.
269 *
270 * Input length of 0 indicates input buffer holds a NUL-terminated string.
271 *
272 * Returns CURLE_OK on success, otherwise specific error code. Function
273 * output shall not be considered valid unless CURLE_OK is returned.
274 *
275 * When encoded data length is 0, returns NULL in *outptr.
276 *
277 * @unittest: 1302
278 */
279CURLcode Curl_base64_encode(struct SessionHandle *data,
280 const char *inputbuff, size_t insize,
281 char **outptr, size_t *outlen)
282{
283 return base64_encode(base64, data, inputbuff, insize, outptr, outlen);
284}
285
286/*
287 * Curl_base64url_encode()
288 *
289 * Given a pointer to an input buffer and an input size, encode it and
290 * return a pointer in *outptr to a newly allocated memory area holding
291 * encoded data. Size of encoded data is returned in variable pointed by
292 * outlen.
293 *
294 * Input length of 0 indicates input buffer holds a NUL-terminated string.
295 *
296 * Returns CURLE_OK on success, otherwise specific error code. Function
297 * output shall not be considered valid unless CURLE_OK is returned.
298 *
299 * When encoded data length is 0, returns NULL in *outptr.
300 *
301 * @unittest: 1302
302 */
303CURLcode Curl_base64url_encode(struct SessionHandle *data,
304 const char *inputbuff, size_t insize,
305 char **outptr, size_t *outlen)
306{
307 return base64_encode(base64url, data, inputbuff, insize, outptr, outlen);
308}
309/* ---- End of Base64 Encoding ---- */
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