ref: 071895fc0863eed39c97095593f5a491048b1036
dir: /sys/src/cmd/gs/src/shc.c/
/* Copyright (C) 1992, 1995 Aladdin Enterprises. All rights reserved.
This software is provided AS-IS with no warranty, either express or
implied.
This software is distributed under license and may not be copied,
modified or distributed except as expressly authorized under the terms
of the license contained in the file LICENSE in this distribution.
For more information about licensing, please refer to
http://www.ghostscript.com/licensing/. For information on
commercial licensing, go to http://www.artifex.com/licensing/ or
contact Artifex Software, Inc., 101 Lucas Valley Road #110,
San Rafael, CA 94903, U.S.A., +1(415)492-9861.
*/
/* $Id: shc.c,v 1.4 2002/02/21 22:24:54 giles Exp $ */
/* Support code for shc.h */
#include "std.h"
#include "scommon.h"
#include "shc.h"
/* ------ Encoding ------ */
/* Empty the 1-word buffer onto the output stream. */
/* q has already been incremented. */
void
hc_put_code_proc(bool reverse_bits, byte * q, uint cw)
{
#define cb(n) ((byte)(cw >> (n * 8)))
if (reverse_bits) {
#if hc_bits_size > 16
q[-3] = byte_reverse_bits[cb(3)];
q[-2] = byte_reverse_bits[cb(2)];
#endif
q[-1] = byte_reverse_bits[cb(1)];
q[0] = byte_reverse_bits[cb(0)];
} else {
#if hc_bits_size > 16
q[-3] = cb(3);
q[-2] = cb(2);
#endif
q[-1] = cb(1);
q[0] = cb(0);
}
#undef cb
}
/* Put out any final bytes. */
/* Note that this does a store_state, but not a load_state. */
byte *
hc_put_last_bits_proc(stream_hc_state * ss, byte * q, uint bits, int bits_left)
{
while (bits_left < hc_bits_size) {
byte c = (byte) (bits >> (hc_bits_size - 8));
if (ss->FirstBitLowOrder)
c = byte_reverse_bits[c];
*++q = c;
bits <<= 8;
bits_left += 8;
}
ss->bits = bits;
ss->bits_left = bits_left;
return q;
}