119 lines
2.5 KiB
C
119 lines
2.5 KiB
C
/*
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* This file is a part of Pcompress, a chunked parallel multi-
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* algorithm lossless compression and decompression program.
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*
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* Copyright (C) 2012-2013 Moinak Ghosh. All rights reserved.
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* Use is subject to license terms.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program.
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* If not, see <http://www.gnu.org/licenses/>.
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*
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* moinakg@belenix.org, http://moinakg.wordpress.com/
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*
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*/
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#ifndef _BS_COMMON_
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#define _BS_COMMON_
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#include <stdio.h>
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#include <utils.h>
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// Simple stream I/O to buffer
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typedef struct {
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uchar_t *buf;
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bsize_t pos;
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bsize_t buflen;
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} bufio_t;
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static int
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BUFOPEN(bufio_t *bio, uchar_t *buf, bsize_t len)
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{
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bio->buf = buf; bio->pos = 0; bio->buflen = len;
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return (0);
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}
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#ifndef __IN_BSPATCH__
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static bsize_t
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BUFWRITE(bufio_t *bio, uchar_t *buf, bsize_t len)
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{
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if (bio->pos + len < bio->buflen) {
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memcpy(bio->buf + bio->pos, buf, len);
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bio->pos += len;
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return (len);
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} else {
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return (-1);
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}
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}
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#endif
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#ifndef __IN_BSDIFF__
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static bsize_t
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BUFREAD(bufio_t *bio, uchar_t *buf, bsize_t len)
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{
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bsize_t actual;
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unsigned int tot;
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actual = len;
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tot = len;
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tot += bio->pos;
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if (tot > bio->buflen) {
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actual = bio->buflen - bio->pos;
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}
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if (actual == 0) return (0);
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memcpy(buf, bio->buf + bio->pos, actual);
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bio->pos += actual;
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return (actual);
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}
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#endif
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#ifndef __IN_BSPATCH__
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static bsize_t
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BUFTELL(bufio_t *bio)
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{
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return (bio->pos);
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}
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static void *
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BUFPTR(bufio_t *bio)
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{
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return (bio->buf + bio->pos);
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}
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static int
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BUFSEEK(bufio_t *bio, bsize_t pos, int typ)
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{
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if (typ == SEEK_SET) {
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bio->pos = pos;
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} else if (typ == SEEK_CUR) {
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bio->pos += pos;
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} else {
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if (pos > 0) {
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fprintf(stderr, "Cannot seek beyond buffer end.\n");
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return (-1);
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} else {
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bio->pos = bio->buflen + pos;
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}
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}
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return (0);
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}
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#endif
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extern int zero_rle_encode(const void *ibuf, const unsigned int ilen,
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void *obuf, unsigned int *olen);
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extern int zero_rle_decode(const void* ibuf, unsigned int ilen,
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void* obuf, unsigned int *olen);
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#endif
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