1 /* 2 * Copyright (c) 1995-2001 Kungliga Tekniska H�gskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $DragonFly: src/libexec/dma/base64.c,v 1.1 2008/02/02 18:20:51 matthias Exp $ 34 */ 35 36 #include <stdlib.h> 37 #include <string.h> 38 39 int base64_encode(const void *data, int size, char **str); 40 41 static char base64_chars[] = 42 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; 43 44 int 45 base64_encode(const void *data, int size, char **str) 46 { 47 char *s, *p; 48 int i; 49 int c; 50 const unsigned char *q; 51 52 p = s = (char *) malloc(size * 4 / 3 + 4); 53 if (p == NULL) 54 return -1; 55 q = (const unsigned char *) data; 56 i = 0; 57 for (i = 0; i < size;) { 58 c = q[i++]; 59 c *= 256; 60 if (i < size) 61 c += q[i]; 62 i++; 63 c *= 256; 64 if (i < size) 65 c += q[i]; 66 i++; 67 p[0] = base64_chars[(c & 0x00fc0000) >> 18]; 68 p[1] = base64_chars[(c & 0x0003f000) >> 12]; 69 p[2] = base64_chars[(c & 0x00000fc0) >> 6]; 70 p[3] = base64_chars[(c & 0x0000003f) >> 0]; 71 if (i > size) 72 p[3] = '='; 73 if (i > size + 1) 74 p[2] = '='; 75 p += 4; 76 } 77 *p = 0; 78 *str = s; 79 return strlen(s); 80 } 81 82