mirror of
https://github.com/signalwire/freeswitch.git
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131 lines
3.1 KiB
C
131 lines
3.1 KiB
C
/*
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* Copyright (c) 2017 FreeSWITCH Solutions LLC
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name of the original author; nor the names of any contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <ks_base64.h>
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static const char ks_b64_table[65] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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KS_DECLARE(ks_status_t) ks_b64_encode(unsigned char *in, ks_size_t ilen, unsigned char *out, ks_size_t olen)
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{
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int y = 0, bytes = 0;
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size_t x = 0;
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unsigned int b = 0, l = 0;
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for (x = 0; x < ilen; x++) {
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b = (b << 8) + in[x];
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l += 8;
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while (l >= 6) {
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out[bytes++] = ks_b64_table[(b >> (l -= 6)) % 64];
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if (bytes >= (int)olen - 1) {
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goto end;
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}
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if (++y != 72) {
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continue;
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}
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/* out[bytes++] = '\n'; */
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y = 0;
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}
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}
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if (l > 0) {
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out[bytes++] = ks_b64_table[((b % 16) << (6 - l)) % 64];
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}
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if (l != 0) {
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while (l < 6 && bytes < (int)olen - 1) {
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out[bytes++] = '=', l += 2;
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}
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}
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end:
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out[bytes] = '\0';
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return KS_STATUS_SUCCESS;
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}
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KS_DECLARE(ks_size_t) ks_b64_decode(char *in, char *out, ks_size_t olen)
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{
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char l64[256];
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int b = 0, c, l = 0, i;
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char *ip, *op = out;
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size_t ol = 0;
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for (i = 0; i < 256; i++) {
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l64[i] = -1;
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}
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for (i = 0; i < 64; i++) {
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l64[(int) ks_b64_table[i]] = (char) i;
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}
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for (ip = in; ip && *ip; ip++) {
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c = l64[(int) *ip];
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if (c == -1) {
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continue;
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}
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b = (b << 6) + c;
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l += 6;
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while (l >= 8) {
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op[ol++] = (char) ((b >> (l -= 8)) % 256);
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if (ol >= olen - 2) {
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goto end;
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}
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}
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}
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end:
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op[ol++] = '\0';
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return ol;
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}
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/* For Emacs:
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* Local Variables:
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* mode:c
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* indent-tabs-mode:t
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* tab-width:4
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* c-basic-offset:4
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* End:
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* For VIM:
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* vim:set softtabstop=4 shiftwidth=4 tabstop=4 noet:
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*/
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