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/* nbdkit
* Copyright Red Hat
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * 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.
*
* * Neither the name of Red Hat nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY RED HAT 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 RED HAT 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.
*/
#ifndef NBDKIT_HEXDIGIT_H
#define NBDKIT_HEXDIGIT_H
/* Convert a hex character ('0'-'9', 'a'-'f', 'A'-'F') to the
* corresponding numeric value.
*
* Note this does *not* check that the input is a hex character. To
* check that, see ascii_isxdigit() in ascii-ctype.h
*/
static inline unsigned char
hexdigit (const char c)
{
if (c >= '0' && c <= '9')
return c - '0';
else if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
else /* if (c >= 'A' && c <= 'F') */
return c - 'A' + 10;
}
/* Convert a pair of hex digits x0, x1 to a byte, eg. '5', 'A' -> 0x5A */
static inline unsigned char
hexbyte (const char x0, const char x1)
{
unsigned char c0, c1;
c0 = hexdigit (x0);
c1 = hexdigit (x1);
return c0 << 4 | c1;
}
/* Convert a number mod 16 to the corresponding hex character. */
static inline const char
hexchar (size_t i)
{
static const char hex[] = "0123456789abcdef";
return hex[i & 0xf];
}
#endif /* NBDKIT_HEXDIGIT_H */
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