libndmp_base64.c revision 7917:5c4442486198
1246149Ssjg/* 2246149Ssjg * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 3246149Ssjg * Use is subject to license terms. 4246149Ssjg */ 5246149Ssjg 6246149Ssjg/* 7246149Ssjg * BSD 3 Clause License 8246149Ssjg * 9246149Ssjg * Copyright (c) 2007, The Storage Networking Industry Association. 10246149Ssjg * 11246149Ssjg * Redistribution and use in source and binary forms, with or without 12246149Ssjg * modification, are permitted provided that the following conditions 13246149Ssjg * are met: 14246149Ssjg * - Redistributions of source code must retain the above copyright 15246149Ssjg * notice, this list of conditions and the following disclaimer. 16246149Ssjg * 17246149Ssjg * - Redistributions in binary form must reproduce the above copyright 18246149Ssjg * notice, this list of conditions and the following disclaimer in 19246149Ssjg * the documentation and/or other materials provided with the 20246149Ssjg * distribution. 21246149Ssjg * 22246149Ssjg * - Neither the name of The Storage Networking Industry Association (SNIA) 23246149Ssjg * nor the names of its contributors may be used to endorse or promote 24246149Ssjg * products derived from this software without specific prior written 25246149Ssjg * permission. 26246149Ssjg * 27246149Ssjg * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 28246149Ssjg * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29246149Ssjg * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30246149Ssjg * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 31246149Ssjg * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32246149Ssjg * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33246149Ssjg * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34246149Ssjg * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35246149Ssjg * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36246149Ssjg * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37246149Ssjg * POSSIBILITY OF SUCH DAMAGE. 38246149Ssjg */ 39246149Ssjg 40246149Ssjg#include <stdio.h> 41246149Ssjg#include <sys/types.h> 42246149Ssjg#include <string.h> 43246149Ssjg#include <ctype.h> 44246149Ssjg#include <stdlib.h> 45246149Ssjg#include <libndmp.h> 46246149Ssjg 47246149Ssjg#define NDMP_ENC_LEN 1024 48246149Ssjg#define NDMP_DEC_LEN 256 49246149Ssjg 50246149Ssjgchar *ndmp_base64_encode(char *); 51246149Ssjgchar *ndmp_base64_decode(char *); 52246149Ssjg 53246149Ssjgstatic boolean_t ndmp_is_base64(unsigned char); 54246149Ssjg 55246149Ssjgstatic char *b64_data = 56246149Ssjg "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; 57246149Ssjg 58246149Ssjgstatic boolean_t 59246149Ssjgndmp_is_base64(unsigned char c) 60246149Ssjg{ 61246149Ssjg return (isalnum(c) || (c == '+') || (c == '/')); 62246149Ssjg} 63246149Ssjg 64246149Ssjg/* caller should use the encloded string and then free the string. */ 65246149Ssjgchar * 66246149Ssjgndmp_base64_encode(char *str_to_encode) 67246149Ssjg{ 68246149Ssjg int ret_cnt = 0; 69246149Ssjg int i = 0, j = 0; 70246149Ssjg char arr_3[3], arr_4[4]; 71246149Ssjg int len = strlen(str_to_encode); 72246149Ssjg char *ret = malloc(NDMP_ENC_LEN); 73246149Ssjg 74246149Ssjg if (ret == NULL) { 75246149Ssjg ndmp_errno = ENDMP_MEM_ALLOC; 76246149Ssjg return (NULL); 77246149Ssjg } 78246149Ssjg 79246149Ssjg while (len--) { 80246149Ssjg arr_3[i++] = *(str_to_encode++); 81246149Ssjg if (i == 3) { 82246149Ssjg arr_4[0] = (arr_3[0] & 0xfc) >> 2; 83246149Ssjg arr_4[1] = ((arr_3[0] & 0x03) << 4) + 84246149Ssjg ((arr_3[1] & 0xf0) >> 4); 85246149Ssjg arr_4[2] = ((arr_3[1] & 0x0f) << 2) + 86246149Ssjg ((arr_3[2] & 0xc0) >> 6); 87246149Ssjg arr_4[3] = arr_3[2] & 0x3f; 88246149Ssjg 89246149Ssjg for (i = 0; i < 4; i++) 90246149Ssjg ret[ret_cnt++] = b64_data[arr_4[i]]; 91246149Ssjg i = 0; 92246149Ssjg } 93246149Ssjg } 94246149Ssjg 95246149Ssjg if (i) { 96246149Ssjg for (j = i; j < 3; j++) 97246149Ssjg arr_3[j] = '\0'; 98246149Ssjg 99246149Ssjg arr_4[0] = (arr_3[0] & 0xfc) >> 2; 100246149Ssjg arr_4[1] = ((arr_3[0] & 0x03) << 4) + 101246149Ssjg ((arr_3[1] & 0xf0) >> 4); 102246149Ssjg arr_4[2] = ((arr_3[1] & 0x0f) << 2) + 103246149Ssjg ((arr_3[2] & 0xc0) >> 6); 104246149Ssjg arr_4[3] = arr_3[2] & 0x3f; 105246149Ssjg 106246149Ssjg for (j = 0; j < (i + 1); j++) 107246149Ssjg ret[ret_cnt++] = b64_data[arr_4[j]]; 108246149Ssjg 109246149Ssjg while (i++ < 3) 110246149Ssjg ret[ret_cnt++] = '='; 111246149Ssjg } 112246149Ssjg 113246149Ssjg ret[ret_cnt++] = '\0'; 114246149Ssjg return (ret); 115246149Ssjg} 116246149Ssjg 117246149Ssjgchar * 118246149Ssjgndmp_base64_decode(char *encoded_str) 119246149Ssjg{ 120246149Ssjg int len = strlen(encoded_str); 121246149Ssjg int i = 0, j = 0; 122246149Ssjg int en_ind = 0; 123246149Ssjg char arr_4[4], arr_3[3]; 124246149Ssjg int ret_cnt = 0; 125246149Ssjg char *ret = malloc(NDMP_DEC_LEN); 126246149Ssjg char *p; 127246149Ssjg 128246149Ssjg if (ret == NULL) { 129246149Ssjg ndmp_errno = ENDMP_MEM_ALLOC; 130246149Ssjg return (NULL); 131246149Ssjg } 132246149Ssjg 133246149Ssjg while (len-- && (encoded_str[en_ind] != '=') && 134246149Ssjg ndmp_is_base64(encoded_str[en_ind])) { 135246149Ssjg arr_4[i++] = encoded_str[en_ind]; 136246149Ssjg en_ind++; 137246149Ssjg if (i == 4) { 138246149Ssjg for (i = 0; i < 4; i++) { 139246149Ssjg if ((p = strchr(b64_data, arr_4[i])) == NULL) 140246149Ssjg return (NULL); 141246149Ssjg 142246149Ssjg arr_4[i] = (int)(p - b64_data); 143246149Ssjg } 144246149Ssjg 145246149Ssjg arr_3[0] = (arr_4[0] << 2) + 146246149Ssjg ((arr_4[1] & 0x30) >> 4); 147246149Ssjg arr_3[1] = ((arr_4[1] & 0xf) << 4) + 148246149Ssjg ((arr_4[2] & 0x3c) >> 2); 149246149Ssjg arr_3[2] = ((arr_4[2] & 0x3) << 6) + 150246149Ssjg arr_4[3]; 151246149Ssjg 152246149Ssjg for (i = 0; i < 3; i++) 153246149Ssjg ret[ret_cnt++] = arr_3[i]; 154246149Ssjg 155246149Ssjg i = 0; 156246149Ssjg } 157246149Ssjg } 158246149Ssjg 159246149Ssjg if (i) { 160246149Ssjg for (j = i; j < 4; j++) 161246149Ssjg arr_4[j] = 0; 162246149Ssjg 163246149Ssjg for (j = 0; j < 4; j++) { 164246149Ssjg if ((p = strchr(b64_data, arr_4[j])) == NULL) 165246149Ssjg return (NULL); 166246149Ssjg 167246149Ssjg arr_4[j] = (int)(p - b64_data); 168246149Ssjg } 169246149Ssjg arr_3[0] = (arr_4[0] << 2) + 170246149Ssjg ((arr_4[1] & 0x30) >> 4); 171246149Ssjg arr_3[1] = ((arr_4[1] & 0xf) << 4) + 172246149Ssjg ((arr_4[2] & 0x3c) >> 2); 173246149Ssjg arr_3[2] = ((arr_4[2] & 0x3) << 6) + 174246149Ssjg arr_4[3]; 175246149Ssjg for (j = 0; j < (i - 1); j++) 176246149Ssjg ret[ret_cnt++] = arr_3[j]; 177246149Ssjg } 178246149Ssjg 179246149Ssjg ret[ret_cnt++] = '\0'; 180246149Ssjg return (ret); 181246149Ssjg} 182246149Ssjg