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/** @file runtime/codecfcn.h
* Definitions of encoding and decoding functions and data structures
*/
/* Copyright 2000-2002 Marko Mkel (msmakela@tcs.hut.fi).
This file is part of MARIA, a reachability analyzer and model checker
for high-level Petri nets.
MARIA is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
MARIA is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
The GNU General Public License is often shipped with GNU software, and
is generally kept in a file called COPYING or LICENSE. If you do not
have a copy of the license, write to the Free Software Foundation,
59 Temple Place, Suite 330, Boston, MA 02111 USA. */
#ifndef FCN
# error "FCN not defined!"
#endif /* FCN */
/** encoding buffer */
static word_t* ENCVAR (buf) = 0;
/** current length of the buffer, in bits */
static unsigned ENCVAR (bits) = 0;
/** allocated length of the buffer, in words */
static unsigned ENCVAR (length) = 0;
/** Append data to the buffer
* @param data Data to be appended
* @param bits Length of data in bits
*/
static void
FCN (enc) (card_t data, unsigned bits)
{
unsigned wordpos, bitpos;
if (ENCVAR (bits) + bits > ENCVAR (length) * WORD_T_BIT) {
/* enlarge the buffer */
wordpos = NUM_WORDS (ENCVAR (bits));
ENCVAR (length) = NUM_WORDS (ENCVAR (bits) + bits);
if (ENCVAR (buf))
ENCVAR (buf) = realloc (ENCVAR (buf), ENCVAR (length) * sizeof (word_t));
else
ENCVAR (buf) = malloc (ENCVAR (length) * sizeof (word_t));
/* clear the new words */
memset (ENCVAR (buf) + wordpos, 0,
(ENCVAR (length) - wordpos) * sizeof (word_t));
}
wordpos = ENCVAR (bits) / WORD_T_BIT, bitpos = ENCVAR (bits) % WORD_T_BIT;
ENCVAR (bits) += bits;
ENCVAR (buf) [wordpos] |= ((word_t) data) << bitpos;
if (bitpos + bits > WORD_T_BIT) {
bitpos = WORD_T_BIT - bitpos;
ENCVAR (buf) [++wordpos] = data >>= bitpos;
# if !(BYTE_ORDER == BIG_ENDIAN || BYTE_ORDER == LITTLE_ENDIAN)
for (bits -= bitpos; bits > WORD_T_BIT; bits -= WORD_T_BIT)
ENCVAR (buf) [++wordpos] = data >>= WORD_T_BIT;
# endif
}
}
/** Remove data from the buffer
* @param bits Number of bits to remove
*/
static void
FCN (del) (unsigned bits)
{
unsigned wordpos, bitpos;
ENCVAR (bits) -= bits;
wordpos = ENCVAR (bits) / WORD_T_BIT, bitpos = ENCVAR (bits) % WORD_T_BIT;
if (bitpos)
ENCVAR (buf) [wordpos] &= (((word_t) 1) << bitpos) - 1;
memset (ENCVAR (buf) + wordpos, 0,
((ENCVAR (bits) + bits) / WORD_T_BIT - wordpos) * sizeof (word_t));
}
/** clear the encoding buffer */
static void
FCN (clear) (void)
{
memset (ENCVAR (buf), 0, NUM_WORDS (ENCVAR (bits)) * sizeof (word_t));
ENCVAR (bits) = ENCVAR (length) = 0;
}
/** clean up the encoding buffer */
static void
FCN (cleanup) (void)
{
free (ENCVAR (buf)), ENCVAR (buf) = 0;
ENCVAR (bits) = ENCVAR (length) = 0;
}
/** deflate the encoding buffer */
static void
FCN (deflate) (void)
{
#if BYTE_ORDER == BIG_ENDIAN
if (ENCVAR (bits) % WORD_T_BIT)
ENCVAR (buf) [ENCVAR (bits) / WORD_T_BIT] <<=
CHAR_BIT * (((word_t) -NUM_BYTES (ENCVAR (bits))) % sizeof (word_t));
#endif
}
/** decoding buffer */
static word_t* DECVAR (buf) = 0;
/** bit offset to the buffer */
static unsigned DECVAR (bits) = 0;
/** Extract data from the buffer
* @param bits number of bits to extract
* @return the data
*/
static card_t
FCN (dec) (unsigned bits)
{
unsigned wordpos, bitpos;
card_t mask, data;
wordpos = DECVAR (bits) / WORD_T_BIT, bitpos = DECVAR (bits) % WORD_T_BIT;
DECVAR (bits) += bits;
mask = bits < CARD_T_BIT ? (((card_t) 1) << bits) - 1 : ~0;
data = (DECVAR (buf) [wordpos] >> bitpos) & mask;
if (bitpos + bits > WORD_T_BIT) {
bitpos = WORD_T_BIT - bitpos;
data |= (((card_t) DECVAR (buf) [++wordpos]) << bitpos) & mask;
# if !(BYTE_ORDER == BIG_ENDIAN || BYTE_ORDER == LITTLE_ENDIAN)
for (bits -= bitpos, bitpos = WORD_T_BIT;
bits > WORD_T_BIT;
bits -= WORD_T_BIT, bitpos += WORD_T_BIT)
data |= (((card_t) DECVAR (buf) [++wordpos]) << bitpos) & mask;
# endif
}
return data;
}
/** inflate the decoding buffer
* @param buf the buffer
* @param bytes length of the buffer
*/
static void
FCN (inflate) (word_t* buf, size_t bytes)
{
DECVAR (buf) = buf;
DECVAR (bits) = 0;
#if BYTE_ORDER == BIG_ENDIAN
if (bytes % sizeof (word_t))
DECVAR (buf) [NUM_WORD_B (bytes) - 1] >>=
CHAR_BIT * (((word_t) -bytes) % sizeof (word_t));
#elif BYTE_ORDER == LITTLE_ENDIAN
if (bytes % sizeof (word_t))
DECVAR (buf) [NUM_WORD_B (bytes) - 1] &=
(((word_t) 1) << (WORD_T_BIT - CHAR_BIT *
(((word_t) -bytes) % sizeof (word_t)))) - 1;
#endif
}
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