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annotate src/base64/base64.c @ 414:309935f59820

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Minor refactoring and added a newline to the debug output.
author markus schnalke <meillo@marmaro.de>
date Wed, 29 Feb 2012 14:23:16 +0100
parents b27f66555ba8
children
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367
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1 /*
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2 ** base64.c
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3 ** Copyright 2000 (C) Oliver Kurth,
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4 **
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5 ** This program is free software; you can redistribute it and/or modify
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6 ** it under the terms of the GNU General Public License as published by
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7 ** the Free Software Foundation; either version 2 of the License, or
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8 ** (at your option) any later version.
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9 **
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10 ** This program is distributed in the hope that it will be useful,
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11 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 ** GNU General Public License for more details.
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14 **
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15 ** You should have received a copy of the GNU General Public License
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16 ** along with this program; if not, write to the Free Software
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17 ** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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18 */
0
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19
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20 /* see also RFC 1341 */
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21
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22 #include <glib.h>
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23 #include <string.h>
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24 #include "base64.h"
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25
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26 gchar*
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27 base64_encode(guchar *buf, gint len)
0
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28 {
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29 guchar *outbuf, *q;
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30 gchar enc[64];
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31 gint i = 0, j = 0;
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32 guint in0, in1, in2;
0
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33
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34 for (; i < 26; i++)
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35 enc[i] = (gchar) ('A' + j++);
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36 j = 0;
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37 for (; i < 52; i++)
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38 enc[i] = (gchar) ('a' + j++);
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39 j = 0;
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40 for (; i < 62; i++)
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41 enc[i] = (gchar) ('0' + j++);
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42 enc[i++] = '+';
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43 enc[i++] = '/';
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44
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45 outbuf = g_malloc(((len + 3) * 8) / 6 +1);
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46 memset(outbuf, 0, ((len + 3) * 8) / 6 +1);
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47 q = outbuf;
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48
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49 i = 0;
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50 while (i < len - 2) {
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51 in0 = buf[i++];
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52 in1 = buf[i++];
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53 in2 = buf[i++];
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54
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55 *(q++) = enc[(in0 >> 2) & 0x3f];
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56 *(q++) = enc[((in0 << 4) | (in1 >> 4)) & 0x3f];
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57 *(q++) = enc[((in1 << 2) | (in2 >> 6)) & 0x3f];
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58 *(q++) = enc[in2 & 0x3f];
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59 }
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60 if ((len - i) == 1) {
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61 in0 = buf[i++];
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62 *(q++) = enc[(in0 >> 2) & 0x3f];
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63 *(q++) = enc[(in0 << 4) & 0x3f];
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64 *(q++) = '=';
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65 *(q++) = '=';
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66 } else if ((len - i) == 2) {
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67 in0 = buf[i++];
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68 in1 = buf[i++];
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69 *(q++) = enc[(in0 >> 2) & 0x3f];
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70 *(q++) = enc[((in0 << 4) | (in1 >> 4)) & 0x3f];
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71 *(q++) = enc[(in1 << 2) & 0x3f];
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72 *(q++) = '=';
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73 }
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74 *q = 0;
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75
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76 return outbuf;
0
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77 }
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78
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79 gchar *base64_decode(gchar *buf, gint *size)
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80 {
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81 guchar *p = buf, *q;
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82 guint in[4];
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83 /* gchar *out = g_malloc(((strlen(buf)+3) * 3) / 4 + 1); */
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84 gchar *out = g_malloc((strlen(buf) + 3) + 1 +1);
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85 memset(out, 0, (strlen(buf) + 3) + 1 +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 out[*size] = '\0';
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133 return out;
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134 }