[4586] | 1 | //base64.c: |
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| 2 | |
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| 3 | /* |
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[6052] | 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2010-2015 |
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[4586] | 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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[4587] | 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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[4588] | 73 | // printf("in={'%c', '%c', '%c'}\n", in[0], in[1], in[2]); |
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[4587] | 74 | out[0] = _base64_tab_fw[(in[0] >> 2) & 0x3F]; |
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| 75 | out[1] = _base64_tab_fw[(((in[0] & 0x03) << 4) | (in[1] >> 4)) & 0x3F]; |
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| 76 | out[2] = _base64_tab_fw[(((in[1] & 0x0F) << 2) | ((in[2] >> 6) & 0x03)) & 0x3F]; |
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| 77 | out[3] = _base64_tab_fw[in[2] & 0x3F]; |
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| 78 | } |
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| 79 | |
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[4588] | 80 | #define _setoff(x) do { if ( off != NULL ) { *off = (x); } } while (0) |
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[4587] | 81 | |
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[4588] | 82 | ssize_t roar_base64_encode(struct roar_base64 * state, void * out, size_t outlen, const void * in, size_t inlen, size_t * off, int eof) { |
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[4587] | 83 | struct roar_base64 state_store; |
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| 84 | size_t offset = 0; |
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| 85 | size_t tlen; |
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[4588] | 86 | ssize_t ret = 0; |
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| 87 | unsigned char * outp; |
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| 88 | const unsigned char * inp; |
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| 89 | |
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| 90 | if ( inlen && in == NULL ) |
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| 91 | return -1; |
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| 92 | |
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| 93 | if ( outlen && out == NULL ) |
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| 94 | return -1; |
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| 95 | |
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| 96 | // this test should be removed as soon as those modes are supported. |
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| 97 | if ( in == NULL || out == NULL ) |
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| 98 | return -1; |
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| 99 | |
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| 100 | // we can not write anything anyway... |
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| 101 | if ( outlen < 4 ) |
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| 102 | return 0; |
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| 103 | |
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| 104 | if ( state == NULL ) { |
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| 105 | state = &state_store; |
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| 106 | roar_base64_init_encode(state, ROAR_BASE64_FLAG_NONE); |
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| 107 | eof = 1; |
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| 108 | } |
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| 109 | |
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| 110 | if ( state->buflen ) { |
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| 111 | tlen = 3 - state->buflen; |
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| 112 | ROAR_DBG("roar_base64_encode(state=%p,...): Still %llu bytes in state", state, (long long unsigned int)state->buflen); |
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| 113 | ROAR_DBG("roar_base64_encode(state=%p,...): Need %llu bytes", state, (long long unsigned int)tlen); |
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| 114 | if ( inlen >= tlen ) { |
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| 115 | memcpy(state->iobuf + state->buflen, in, tlen); |
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| 116 | offset += tlen; |
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| 117 | in += tlen; |
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| 118 | inlen -= tlen; |
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| 119 | _libroar_base64_encode_block(out, state->iobuf); |
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| 120 | out += 4; |
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| 121 | outlen -= 4; |
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| 122 | ret += 4; |
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| 123 | state->buflen = 0; |
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| 124 | } else { |
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| 125 | memcpy(state->iobuf + state->buflen, in, inlen); |
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| 126 | state->buflen += inlen; |
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| 127 | _setoff(inlen); |
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| 128 | return 0; |
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| 129 | } |
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| 130 | } |
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| 131 | |
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| 132 | for (; inlen >= 3 && outlen >= 4;) { |
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| 133 | _libroar_base64_encode_block(out, in); |
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| 134 | ret += 4; |
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| 135 | out += 4; |
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| 136 | in += 3; |
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| 137 | offset += 3; |
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| 138 | inlen -= 3; |
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| 139 | outlen -= 4; |
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| 140 | } |
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| 141 | |
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| 142 | // something left? |
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| 143 | if ( inlen ) { |
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| 144 | if ( eof ) { |
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| 145 | if ( outlen >= 4 ) { |
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| 146 | outp = out; |
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| 147 | inp = in; |
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| 148 | switch (inlen) { |
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| 149 | case 1: |
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| 150 | outp[0] = _base64_tab_fw[inp[0] >> 2]; |
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| 151 | outp[1] = _base64_tab_fw[(inp[0] & 0x03) << 4]; |
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| 152 | outp[2] = '='; |
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| 153 | outp[3] = '='; |
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| 154 | ret += 4; |
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| 155 | out += 4; |
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| 156 | in += 1; |
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| 157 | offset += 1; |
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| 158 | inlen -= 1; |
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| 159 | outlen -= 4; |
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| 160 | break; |
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| 161 | case 2: |
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| 162 | outp[0] = _base64_tab_fw[inp[0] >> 2]; |
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| 163 | outp[1] = _base64_tab_fw[(((inp[0] & 0x03) << 4) | (inp[1] >> 4)) & 0x3F]; |
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| 164 | outp[2] = _base64_tab_fw[(((inp[1] & 0x0F) << 2)) & 0x3F]; |
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| 165 | outp[3] = '='; |
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| 166 | ret += 4; |
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| 167 | out += 4; |
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| 168 | in += 2; |
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| 169 | offset += 2; |
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| 170 | inlen -= 2; |
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| 171 | outlen -= 4; |
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| 172 | break; |
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| 173 | } |
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| 174 | } |
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| 175 | } else { |
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| 176 | memcpy(state->iobuf, in, inlen); |
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| 177 | state->buflen = inlen; |
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| 178 | offset += inlen; |
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| 179 | in += inlen; |
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| 180 | inlen -= inlen; |
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| 181 | } |
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| 182 | } |
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| 183 | |
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| 184 | if ( outlen ) { |
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| 185 | *(char*)out = 0; |
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| 186 | } |
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| 187 | |
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| 188 | _setoff(offset); |
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| 189 | |
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| 190 | return 0; |
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| 191 | } |
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| 192 | |
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| 193 | ssize_t roar_base64_decode(struct roar_base64 * state, void * out, size_t outlen, const void * in, size_t inlen, size_t * off) { |
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| 194 | struct roar_base64 state_store; |
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| 195 | ssize_t ret = 0; |
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| 196 | unsigned char c; |
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| 197 | int bits; |
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| 198 | const unsigned char * inp = in; |
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| 199 | unsigned char * outp = out; |
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| 200 | size_t offset = 0; |
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[4587] | 201 | |
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| 202 | if ( inlen && in == NULL ) |
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| 203 | return -1; |
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| 204 | |
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| 205 | if ( outlen && out == NULL ) |
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| 206 | return -1; |
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| 207 | |
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| 208 | // this test should be removed as soon as those modes are supported. |
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| 209 | if ( in == NULL || out == NULL ) |
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| 210 | return -1; |
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| 211 | |
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| 212 | if ( state == NULL ) { |
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| 213 | state = &state_store; |
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[4588] | 214 | roar_base64_init_encode(state, ROAR_BASE64_FLAG_NONE); |
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| 215 | } |
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| 216 | |
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| 217 | if ( state->reglen >= 8 ) { |
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| 218 | *outp = (state->reg >> (state->reglen - 8)) & 0xFF; |
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| 219 | state->reglen -= 8; |
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| 220 | outp++; |
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| 221 | outlen--; |
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| 222 | ret++; |
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| 223 | } |
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| 224 | |
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| 225 | if ( state->flags & ROAR_BASE64_FLAG_EOF ) { |
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| 226 | if ( outlen ) { |
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| 227 | *outp = 0; |
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| 228 | } |
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| 229 | return ret; |
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[4587] | 230 | } |
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| 231 | |
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[4588] | 232 | //printf("state->reglen=%i\n", (int)state->reglen); |
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| 233 | |
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| 234 | for (; inlen && outlen; ) { |
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| 235 | c = *inp; |
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| 236 | inp++; |
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| 237 | inlen--; |
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| 238 | offset++; |
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| 239 | |
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| 240 | if ( c == '=' ) { |
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| 241 | bits = 0; |
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[4587] | 242 | } else { |
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[4588] | 243 | // hi-bit set chars need to be ignored. |
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| 244 | if ( (size_t)c > sizeof(_base64_tab_bw) ) |
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| 245 | continue; |
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| 246 | |
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| 247 | bits = _base64_tab_bw[c]; |
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| 248 | |
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| 249 | // ignore unknown chars. |
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| 250 | if ( bits == (char)0xFF ) |
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| 251 | continue; |
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| 252 | } |
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| 253 | |
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| 254 | state->reg <<= 6; |
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| 255 | state->reg |= bits; |
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| 256 | state->reglen += 6; |
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| 257 | |
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| 258 | if ( state->reglen >= 8 ) { |
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| 259 | *outp = (state->reg >> (state->reglen - 8)) & 0xFF; |
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| 260 | state->reglen -= 8; |
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| 261 | outp++; |
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| 262 | outlen--; |
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| 263 | ret++; |
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| 264 | } |
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| 265 | |
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| 266 | if ( c == '=' ) { |
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| 267 | state->flags |= ROAR_BASE64_FLAG_EOF; |
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| 268 | if ( state->reglen <= 6 ) { |
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| 269 | state->reglen = 0; |
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| 270 | } |
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| 271 | if ( inlen ) { |
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| 272 | if ( *inp == '=' ) { |
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| 273 | offset++; |
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| 274 | } |
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| 275 | } |
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| 276 | break; |
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[4587] | 277 | } |
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| 278 | } |
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[4588] | 279 | |
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| 280 | if ( off != NULL ) { |
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| 281 | *off = offset; |
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| 282 | } |
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[4587] | 283 | |
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[4588] | 284 | if ( outlen ) { |
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| 285 | *outp = 0; |
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| 286 | } |
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| 287 | |
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| 288 | return ret; |
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| 289 | } |
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[4587] | 290 | |
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| 291 | int roar_base64_is_eof(struct roar_base64 * state) { |
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| 292 | if ( state == NULL ) |
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| 293 | return -1; |
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| 294 | |
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[4588] | 295 | if ( state->reglen >= 8 ) |
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| 296 | return 0; |
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| 297 | |
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[4587] | 298 | return !!(state->flags & ROAR_BASE64_FLAG_EOF); |
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| 299 | } |
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| 300 | |
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| 301 | int roar_base64_uninit(struct roar_base64 * state) { |
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| 302 | if ( state == NULL ) |
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| 303 | return -1; |
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| 304 | |
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| 305 | if ( state->buflen ) { |
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[4588] | 306 | ROAR_WARN("roar_base64_uninit(state=%p): State has %i bytes left in IO buffer. This is a application error.", state, state->buflen); |
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[4587] | 307 | } |
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| 308 | |
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| 309 | if ( state->reglen ) { |
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[4588] | 310 | ROAR_WARN("roar_base64_uninit(state=%p): State has %i bits left in decode register. This is a application error.", state, state->reglen); |
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[4587] | 311 | } |
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| 312 | |
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| 313 | return 0; |
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| 314 | } |
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| 315 | |
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[4586] | 316 | //ll |
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