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Split base64 encode/decode functions into separate source files.

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They are independent functions.
This commit is contained in:
Todd C. Miller
2021-02-24 12:20:36 -07:00
parent f35d9c8be1
commit 33551acd1f
3 changed files with 134 additions and 82 deletions
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64
plugins/sudoers/b64_encode.c Normal file
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@@ -0,0 +1,64 @@
/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2013-2018 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#include "sudoers.h"
static const unsigned char base64enc_tab[64] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
size_t
base64_encode(const unsigned char *in, size_t in_len, char *out, size_t out_len)
{
size_t ii, io;
unsigned int rem, v;
debug_decl(base64_encode, SUDOERS_DEBUG_MATCH);
for (io = 0, ii = 0, v = 0, rem = 0; ii < in_len; ii++) {
unsigned char ch = in[ii];
v = (v << 8) | ch;
rem += 8;
while (rem >= 6) {
rem -= 6;
if (io >= out_len)
debug_return_size_t((size_t)-1); /* truncation is failure */
out[io++] = base64enc_tab[(v >> rem) & 63];
}
}
if (rem != 0) {
v <<= (6 - rem);
if (io >= out_len)
debug_return_size_t((size_t)-1); /* truncation is failure */
out[io++] = base64enc_tab[v&63];
}
while (io & 3) {
if (io >= out_len)
debug_return_size_t((size_t)-1); /* truncation is failure */
out[io++] = '=';
}
if (io >= out_len)
debug_return_size_t((size_t)-1); /* no room for NUL terminator */
out[io] = '\0';
debug_return_size_t(io);
}