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annotate src/base64/base64.c @ 203:45acc5727493

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removed --with-glib-static configure option linking glib statically is interesting if no other program uses it on today's systems glib is widely used if one cares on linking statically, he can link everything statically the special case for glib will not get special care anymore
author meillo@marmaro.de
date Fri, 16 Jul 2010 14:48:17 +0200
parents 26e34ae9a3e3
children 589c365d90b1
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1 /* base64.c, Copyright 2000 (C) Oliver Kurth,
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2 *
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3 * This program is free software; you can redistribute it and/or modify
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4 * it under the terms of the GNU General Public License as published by
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5 * the Free Software Foundation; either version 2 of the License, or
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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6 * (at your option) any later version.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * You should have received a copy of the GNU General Public License
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14 * along with this program; if not, write to the Free Software
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15 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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16 */
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17
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18 /*
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19 send bugs to: kurth@innominate.de
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20 */
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21
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22 /* see also RFC 1341 */
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23
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24 #include <glib.h>
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25 #include <string.h>
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26 #include "base64.h"
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27
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28 gchar*
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29 base64_encode(guchar * buf, gint len)
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30 {
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31 guchar *outbuf, *q;
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32 gchar enc[64];
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33 gint i = 0, j = 0;
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34 guint in0, in1, in2;
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35
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36 for (; i < 26; i++)
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37 enc[i] = (gchar) ('A' + j++);
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38 j = 0;
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39 for (; i < 52; i++)
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40 enc[i] = (gchar) ('a' + j++);
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41 j = 0;
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42 for (; i < 62; i++)
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43 enc[i] = (gchar) ('0' + j++);
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44 enc[i++] = '+';
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45 enc[i++] = '/';
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46
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47 outbuf = g_malloc(((len + 3) * 8) / 6);
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48 q = outbuf;
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49
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50 i = 0;
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51 while (i < len - 2) {
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52 in0 = buf[i++];
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53 in1 = buf[i++];
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54 in2 = buf[i++];
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55
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56 *(q++) = enc[(in0 >> 2) & 0x3f];
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57 *(q++) = enc[((in0 << 4) | (in1 >> 4)) & 0x3f];
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58 *(q++) = enc[((in1 << 2) | (in2 >> 6)) & 0x3f];
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59 *(q++) = enc[in2 & 0x3f];
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60 }
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61 if ((len - i) == 1) {
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62 in0 = buf[i++];
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63 *(q++) = enc[(in0 >> 2) & 0x3f];
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64 *(q++) = enc[(in0 << 4) & 0x3f];
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65 *(q++) = '=';
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66 *(q++) = '=';
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67 } else if ((len - i) == 2) {
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68 in0 = buf[i++];
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69 in1 = buf[i++];
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70 *(q++) = enc[(in0 >> 2) & 0x3f];
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71 *(q++) = enc[((in0 << 4) | (in1 >> 4)) & 0x3f];
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72 *(q++) = enc[(in1 << 2) & 0x3f];
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73 *(q++) = '=';
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74 }
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75 *q = 0;
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76
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77 return outbuf;
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78 }
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79
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80 gchar *base64_decode(gchar * buf, gint * size)
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81 {
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82 guchar *p = buf, *q;
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83 guint in[4];
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84 /* gchar *out = g_malloc(((strlen(buf)+3) * 3) / 4 + 1); */
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85 gchar *out = g_malloc((strlen(buf) + 3) + 1);
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86
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87 q = out;
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88 *size = 0;
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89
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90 *q = 0;
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91
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92 while (*p) {
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93 int i = 0;
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94 while (i < 4) {
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95 if (!*p)
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96 break;
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97 if ((*p >= 'A') && (*p <= 'Z'))
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98 in[i++] = *p - 'A';
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99 else if ((*p >= 'a') && (*p <= 'z'))
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100 in[i++] = (*p - 'a') + 26;
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101 else if ((*p >= '0') && (*p <= '9'))
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102 in[i++] = (*p - '0') + 52;
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103 else if (*p == '+')
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104 in[i++] = 62;
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105 else if (*p == '/')
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106 in[i++] = 63;
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107 else if (*p == '=') {
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108 in[i++] = 0;
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109 p++;
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110 break;
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111 } else if ((*p != '\r') && (*p != '\n')) {
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112 p++;
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113 break;
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114 }
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115 p++;
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116 }
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117 if ((i == 4) || (p[-1] == '=')) {
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118 *(q++) = ((in[0] << 2) | (in[1] >> 4));
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119 *(q++) = ((in[1] << 4) | (in[2] >> 2));
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120 *(q++) = ((in[2] << 6) | in[3]);
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121 if (p[-1] == '=') {
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122 if (i == 3) {
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123 (*size)++;
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124 } else if (i == 4) {
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125 (*size) += 2;
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126 }
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127 } else {
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128 *size += 3;
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129 }
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130 }
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131 }
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132 return out;
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133 }