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>
49 static void decodeQuantum(unsigned char *dest, const char *src)
53 for(i = 0; i < 4; i++) {
54 if(src[i] >= 'A' && src[i] <= 'Z')
55 x = (x << 6) + (unsigned int)(src[i] - 'A' + 0);
56 else if(src[i] >= 'a' && src[i] <= 'z')
57 x = (x << 6) + (unsigned int)(src[i] - 'a' + 26);
58 else if(src[i] >= '0' && src[i] <= '9')
59 x = (x << 6) + (unsigned int)(src[i] - '0' + 52);
60 else if(src[i] == '+')
62 else if(src[i] == '/')
64 else if(src[i] == '=')
68 dest[2] = (unsigned char)(x & 255); x >>= 8;
69 dest[1] = (unsigned char)(x & 255); x >>= 8;
70 dest[0] = (unsigned char)(x & 255); x >>= 8;
74 * Curl_base64_decode()
76 * Given a base64 string at src, decode it into the memory pointed to by
77 * dest. Returns the length of the decoded data.
79 size_t Curl_base64_decode(const char *src, char *dest)
85 unsigned char lastQuantum[3];
88 while((src[length] != '=') && src[length])
90 while(src[length+equalsTerm] == '=')
93 numQuantums = (length + equalsTerm) / 4;
95 rawlen = (numQuantums * 3) - equalsTerm;
97 for(i = 0; i < numQuantums - 1; i++) {
98 decodeQuantum((unsigned char *)dest, src);
102 decodeQuantum(lastQuantum, src);
103 for(i = 0; i < 3 - equalsTerm; i++)
104 dest[i] = lastQuantum[i];
109 /* ---- Base64 Encoding --- */
110 static char table64[]=
111 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
114 * Curl_base64_encode()
116 * Returns the length of the newly created base64 string. The third argument
117 * is a pointer to an allocated area holding the base64 data. If something
118 * went wrong, -1 is returned.
121 size_t Curl_base64_encode(const char *inp, size_t insize, char **outptr)
123 unsigned char ibuf[3];
124 unsigned char obuf[4];
130 char *indata = (char *)inp;
133 insize = strlen(indata);
135 base64data = output = (char*)malloc(insize*4/3+4);
140 for (i = inputparts = 0; i < 3; i++) {
151 obuf [0] = (ibuf [0] & 0xFC) >> 2;
152 obuf [1] = ((ibuf [0] & 0x03) << 4) | ((ibuf [1] & 0xF0) >> 4);
153 obuf [2] = ((ibuf [1] & 0x0F) << 2) | ((ibuf [2] & 0xC0) >> 6);
154 obuf [3] = ibuf [2] & 0x3F;
157 case 1: /* only one byte read */
158 sprintf(output, "%c%c==",
162 case 2: /* two bytes read */
163 sprintf(output, "%c%c%c=",
169 sprintf(output, "%c%c%c%c",
179 *outptr = base64data; /* make it return the actual data memory */
181 return strlen(base64data); /* return the length of the new data */
183 /* ---- End of Base64 Encoding ---- */
185 /************* TEST HARNESS STUFF ****************/
189 /* encoding test harness. Read in standard input and write out the length
190 * returned by Curl_base64_encode, followed by the base64'd data itself
194 #define TEST_NEED_SUCK
197 int main(int argc, char **argv, char **envp)
204 data = (unsigned char *)suck(&dataLen);
205 base64Len = Curl_base64_encode(data, dataLen, &base64);
207 fprintf(stderr, "%d\n", base64Len);
208 fprintf(stdout, "%s", base64);
210 free(base64); free(data);
216 /* decoding test harness. Read in a base64 string from stdin and write out the
217 * length returned by Curl_base64_decode, followed by the decoded data itself
219 * gcc -DTEST_DECODE base64.c -o base64 mprintf.o memdebug.o
223 #define TEST_NEED_SUCK
226 int main(int argc, char **argv, char **envp)
234 base64 = (char *)suck(&base64Len);
235 data = (unsigned char *)malloc(base64Len * 3/4 + 8);
236 dataLen = Curl_base64_decode(base64, data);
238 fprintf(stderr, "%d\n", dataLen);
240 for(i=0; i < dataLen; i+=0x10) {
241 printf("0x%02x: ", i);
242 for(j=0; j < 0x10; j++)
244 printf("%02x ", data[i+j]);
250 for(j=0; j < 0x10; j++)
252 printf("%c", isgraph(data[i+j])?data[i+j]:'.');
258 free(base64); free(data);
263 #ifdef TEST_NEED_SUCK
264 /* this function 'sucks' in as much as possible from stdin */
265 void *suck(int *lenptr)
268 unsigned char *buf = NULL;
274 buf = (unsigned char *)realloc(buf, cursize);
275 memset(buf + len, 0, cursize - len);
276 lastread = fread(buf + len, 1, cursize - len, stdin);
278 } while(!feof(stdin));