1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2004, Daniel Stenberg, <daniel@haxx.se>, et al.
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 http://curl.haxx.se/docs/copyright.html.
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.
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
22 ***************************************************************************/
24 /* Base64 encoding/decoding
26 * Test harnesses down the bottom - compile with -DTEST_ENCODE for
27 * a program that will read in raw data from stdin and write out
28 * a base64-encoded version to stdout, and the length returned by the
29 * encoding function to stderr. Compile with -DTEST_DECODE for a program that
30 * will go the other way.
32 * This code will break if int is smaller than 32 bits
40 #define _MPRINTF_REPLACE /* use our functions only */
41 #include <curl/mprintf.h>
46 /* include memdebug.h last */
50 static void decodeQuantum(unsigned char *dest, const char *src)
54 for(i = 0; i < 4; i++) {
55 if(src[i] >= 'A' && src[i] <= 'Z')
56 x = (x << 6) + (unsigned int)(src[i] - 'A' + 0);
57 else if(src[i] >= 'a' && src[i] <= 'z')
58 x = (x << 6) + (unsigned int)(src[i] - 'a' + 26);
59 else if(src[i] >= '0' && src[i] <= '9')
60 x = (x << 6) + (unsigned int)(src[i] - '0' + 52);
61 else if(src[i] == '+')
63 else if(src[i] == '/')
65 else if(src[i] == '=')
69 dest[2] = (unsigned char)(x & 255);
71 dest[1] = (unsigned char)(x & 255);
73 dest[0] = (unsigned char)(x & 255);
77 * Curl_base64_decode()
79 * Given a base64 string at src, decode it and return an allocated memory in
80 * the *outptr. Returns the length of the decoded data.
82 size_t Curl_base64_decode(const char *src, unsigned char **outptr)
88 unsigned char lastQuantum[3];
90 unsigned char *newstr;
94 while((src[length] != '=') && src[length])
96 /* A maximum of two = padding characters is allowed */
97 if(src[length] == '=') {
99 if(src[length+equalsTerm] == '=')
102 numQuantums = (length + equalsTerm) / 4;
104 /* Don't allocate a buffer if the decoded length is 0 */
105 if (numQuantums <= 0)
108 rawlen = (numQuantums * 3) - equalsTerm;
110 /* The buffer must be large enough to make room for the last quantum
111 (which may be partially thrown out) and the zero terminator. */
112 newstr = malloc(rawlen+4);
118 /* Decode all but the last quantum (which may not decode to a
119 multiple of 3 bytes) */
120 for(i = 0; i < numQuantums - 1; i++) {
121 decodeQuantum((unsigned char *)newstr, src);
122 newstr += 3; src += 4;
125 /* This final decode may actually read slightly past the end of the buffer
126 if the input string is missing pad bytes. This will almost always be
128 decodeQuantum(lastQuantum, src);
129 for(i = 0; i < 3 - equalsTerm; i++)
130 newstr[i] = lastQuantum[i];
132 newstr[i] = 0; /* zero terminate */
136 /* ---- Base64 Encoding --- */
137 static const char table64[]=
138 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
141 * Curl_base64_encode()
143 * Returns the length of the newly created base64 string. The third argument
144 * is a pointer to an allocated area holding the base64 data. If something
145 * went wrong, -1 is returned.
148 size_t Curl_base64_encode(const char *inp, size_t insize, char **outptr)
150 unsigned char ibuf[3];
151 unsigned char obuf[4];
157 char *indata = (char *)inp;
159 *outptr = NULL; /* set to NULL in case of failure before we reach the end */
162 insize = strlen(indata);
164 base64data = output = (char*)malloc(insize*4/3+4);
169 for (i = inputparts = 0; i < 3; i++) {
180 obuf [0] = (ibuf [0] & 0xFC) >> 2;
181 obuf [1] = ((ibuf [0] & 0x03) << 4) | ((ibuf [1] & 0xF0) >> 4);
182 obuf [2] = ((ibuf [1] & 0x0F) << 2) | ((ibuf [2] & 0xC0) >> 6);
183 obuf [3] = ibuf [2] & 0x3F;
186 case 1: /* only one byte read */
187 snprintf(output, 5, "%c%c==",
191 case 2: /* two bytes read */
192 snprintf(output, 5, "%c%c%c=",
198 snprintf(output, 5, "%c%c%c%c",
208 *outptr = base64data; /* make it return the actual data memory */
210 return strlen(base64data); /* return the length of the new data */
212 /* ---- End of Base64 Encoding ---- */
214 /************* TEST HARNESS STUFF ****************/
218 /* encoding test harness. Read in standard input and write out the length
219 * returned by Curl_base64_encode, followed by the base64'd data itself
223 #define TEST_NEED_SUCK
226 int main(int argc, char **argv, char **envp)
233 data = (unsigned char *)suck(&dataLen);
234 base64Len = Curl_base64_encode(data, dataLen, &base64);
236 fprintf(stderr, "%d\n", base64Len);
237 fprintf(stdout, "%s", base64);
239 free(base64); free(data);
245 /* decoding test harness. Read in a base64 string from stdin and write out the
246 * length returned by Curl_base64_decode, followed by the decoded data itself
248 * gcc -DTEST_DECODE base64.c -o base64 mprintf.o memdebug.o
252 #define TEST_NEED_SUCK
255 int main(int argc, char **argv, char **envp)
263 base64 = (char *)suck(&base64Len);
264 data = (unsigned char *)malloc(base64Len * 3/4 + 8);
265 dataLen = Curl_base64_decode(base64, data);
267 fprintf(stderr, "%d\n", dataLen);
269 for(i=0; i < dataLen; i+=0x10) {
270 printf("0x%02x: ", i);
271 for(j=0; j < 0x10; j++)
273 printf("%02x ", data[i+j]);
279 for(j=0; j < 0x10; j++)
281 printf("%c", isgraph(data[i+j])?data[i+j]:'.');
287 free(base64); free(data);
292 #ifdef TEST_NEED_SUCK
293 /* this function 'sucks' in as much as possible from stdin */
294 void *suck(int *lenptr)
297 unsigned char *buf = NULL;
303 buf = (unsigned char *)realloc(buf, cursize);
304 memset(buf + len, 0, cursize - len);
305 lastread = fread(buf + len, 1, cursize - len, stdin);
307 } while(!feof(stdin));