1 | //base64.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2010 |
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5 | * |
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6 | * This file is part of libroar a part of RoarAudio, |
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7 | * a cross-platform sound system for both, home and professional use. |
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8 | * See README for details. |
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9 | * |
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10 | * This file is free software; you can redistribute it and/or modify |
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11 | * it under the terms of the GNU General Public License version 3 |
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12 | * as published by the Free Software Foundation. |
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13 | * |
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14 | * libroar is distributed in the hope that it will be useful, |
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15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 | * GNU General Public License for more details. |
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18 | * |
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19 | * You should have received a copy of the GNU General Public License |
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20 | * along with this software; see the file COPYING. If not, write to |
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21 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
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22 | * Boston, MA 02110-1301, USA. |
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23 | * |
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24 | * NOTE for everyone want's to change something and send patches: |
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25 | * read README and HACKING! There a addition information on |
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26 | * the license of this document you need to read before you send |
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27 | * any patches. |
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28 | * |
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29 | * NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc |
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30 | * or libpulse*: |
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31 | * The libs libroaresd, libroararts and libroarpulse link this lib |
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32 | * and are therefore GPL. Because of this it may be illigal to use |
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33 | * them with any software that uses libesd, libartsc or libpulse*. |
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34 | */ |
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35 | |
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36 | #include "libroar.h" |
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37 | |
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38 | static char _base64_tab_fw[] = |
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39 | "ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
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40 | "abcdefghijklmnopqrstuvwxyz" |
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41 | "0123456789+/"; |
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42 | |
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43 | static char _base64_tab_bw[] = { |
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44 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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45 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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46 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, |
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47 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x3e, 0xff, 0xff, 0xff, 0x3f, |
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48 | 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff, 0xff, |
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49 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, |
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50 | 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, |
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51 | 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff, |
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52 | 0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, |
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53 | 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, |
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54 | 0x31, 0x32, 0x33, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff |
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55 | }; |
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56 | |
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57 | |
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58 | int roar_base64_init(struct roar_base64 * state, int flags) { |
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59 | if ( flags == -1 ) |
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60 | flags = 0; |
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61 | |
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62 | if ( state == NULL ) |
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63 | return -1; |
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64 | |
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65 | memset(state, 0, sizeof(struct roar_base64)); |
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66 | |
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67 | state->flags = flags; |
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68 | |
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69 | return 0; |
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70 | } |
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71 | |
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72 | static inline void _libroar_base64_encode_block(unsigned char out[4], const unsigned char in[3]) { |
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73 | out[0] = _base64_tab_fw[(in[0] >> 2) & 0x3F]; |
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74 | out[1] = _base64_tab_fw[(((in[0] & 0x03) << 4) | (in[1] >> 4)) & 0x3F]; |
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75 | out[2] = _base64_tab_fw[(((in[1] & 0x0F) << 2) | ((in[2] >> 6) & 0x03)) & 0x3F]; |
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76 | out[3] = _base64_tab_fw[in[2] & 0x3F]; |
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77 | } |
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78 | |
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79 | #define _setoff(x) do { if ( off != NULL ) { *off = (x) } } while (0) |
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80 | |
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81 | ssize_t roar_base64_encode(struct roar_base64 * state, void * out, size_t outlen, void * in, size_t inlen, size_t * off, int eof) { |
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82 | struct roar_base64 state_store; |
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83 | size_t offset = 0; |
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84 | size_t tlen; |
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85 | |
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86 | if ( inlen && in == NULL ) |
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87 | return -1; |
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88 | |
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89 | if ( outlen && out == NULL ) |
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90 | return -1; |
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91 | |
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92 | // this test should be removed as soon as those modes are supported. |
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93 | if ( in == NULL || out == NULL ) |
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94 | return -1; |
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95 | |
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96 | if ( state == NULL ) { |
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97 | state = &state_store; |
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98 | roar_base64_init_encode(state); |
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99 | eof = 1; |
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100 | } |
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101 | |
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102 | if ( state->buflen ) { |
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103 | if ( (state->buflen + inlen) >= 3 ) { |
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104 | tlen = 3 - state->buflen; |
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105 | memcpy(state->buf + state->buflen, in, tlen); |
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106 | offset += tlen; |
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107 | in += tlen; |
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108 | inlen -= tlen; |
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109 | } else { |
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110 | memcpy(state->buf + state->buflen, in, inlen); |
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111 | _setoff(inlen); |
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112 | return 0; |
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113 | } |
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114 | } |
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115 | } |
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116 | |
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117 | ssize_t roar_base64_decode(struct roar_base64 * state, void * out, size_t outlen, void * in, size_t inlen, size_t * off); |
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118 | |
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119 | int roar_base64_is_eof(struct roar_base64 * state) { |
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120 | if ( state == NULL ) |
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121 | return -1; |
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122 | |
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123 | return !!(state->flags & ROAR_BASE64_FLAG_EOF); |
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124 | } |
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125 | |
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126 | int roar_base64_uninit(struct roar_base64 * state) { |
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127 | if ( state == NULL ) |
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128 | return -1; |
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129 | |
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130 | if ( state->buflen ) { |
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131 | ROAR_WARN("roar_base64_uninit(state=%p): State has bytes left in IO buffer. This is a application error."); |
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132 | } |
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133 | |
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134 | if ( state->reglen ) { |
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135 | ROAR_WARN("roar_base64_uninit(state=%p): State has bits left in decode register. This is a application error."); |
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136 | } |
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137 | |
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138 | return 0; |
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139 | } |
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140 | |
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141 | //ll |
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