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/*
*
* base16 encoding/decoding per RFC 4648
*
* Copyright (C) 2013, 2016 Milan Kupcevic
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "basez.h"
static const unsigned char c16u[] = "0123456789ABCDEF";
static const unsigned char c16l[] = "0123456789abcdef";
static const unsigned char c16d[] =
{
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 00 - 07 */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 08 - 0f */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 10 - 17 */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 18 - 1f */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 20 - 27 */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 28 - 2f */
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 30 - 37 */
0x08, 0x09, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 38 - 3f */
0xff, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0xff, /* 40 - 47 */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 48 - 4f */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 50 - 57 */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 58 - 5f */
0xff, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0xff, /* 60 - 67 */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 68 - 6f */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 70 - 77 */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 78 - 7f */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 80 - 87 */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 88 - 8f */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 90 - 97 */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 98 - 9f */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* a0 - a7 */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* a8 - af */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* b0 - b7 */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* b8 - bf */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* c0 - c7 */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* c8 - cf */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* d0 - d7 */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* d8 - df */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* e0 - e7 */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* e8 - ef */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* f0 - f7 */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* f8 - ff */
};
void
encode_base16u(
const unsigned char *bin,
unsigned char *bout)
{
bout[1] = c16u[*bin & 0x0f];
bout[0] = c16u[*bin >> 4];
}
void
encode_base16l(
const unsigned char *bin,
unsigned char *bout)
{
bout[1] = c16l[*bin & 0x0f];
bout[0] = c16l[*bin >> 4];
}
int
decode_base16(
const unsigned char *bin,
unsigned char *bout)
{
if(c16d[bin[0]] != 0xff)
*bout = c16d[bin[0]] << 4;
else
return 0;
if(c16d[bin[1]] != 0xff)
*bout = *bout | c16d[bin[1]];
else
return 0;
return 1;
}
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