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- /* Copyright (C) 1992, 1995 Aladdin Enterprises. All rights reserved.
-
- This file is part of AFPL Ghostscript.
-
- AFPL Ghostscript is distributed with NO WARRANTY OF ANY KIND. No author or
- distributor accepts any responsibility for the consequences of using it, or
- for whether it serves any particular purpose or works at all, unless he or
- she says so in writing. Refer to the Aladdin Free Public License (the
- "License") for full details.
-
- Every copy of AFPL Ghostscript must include a copy of the License, normally
- in a plain ASCII text file named PUBLIC. The License grants you the right
- to copy, modify and redistribute AFPL Ghostscript, but only under certain
- conditions described in the License. Among other things, the License
- requires that the copyright notice and this notice be preserved on all
- copies.
- */
-
- /*$Id: shc.c,v 1.2 2000/09/19 19:00:50 lpd 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;
- }
-