124 lines
3.5 KiB
C
124 lines
3.5 KiB
C
/* $NetBSD: ntfs_compr.c,v 1.4 2001/11/10 13:24:53 lukem Exp $ */
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/*-
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* Copyright (c) 1998, 1999 Semen Ustimenko
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Id: ntfs_compr.c,v 1.4 1999/05/12 09:42:54 semenu Exp
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ntfs_compr.c,v 1.4 2001/11/10 13:24:53 lukem Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/namei.h>
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#include <sys/proc.h>
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#include <sys/kernel.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <sys/buf.h>
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#include <sys/file.h>
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#include <sys/malloc.h>
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#ifdef __FreeBSD__
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#include <machine/clock.h>
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#endif
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#include <miscfs/specfs/specdev.h>
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#include <ntfs/ntfs.h>
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#include <ntfs/ntfs_compr.h>
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#define GET_UINT16(addr) (*((u_int16_t *)(addr)))
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int
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ntfs_uncompblock(
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u_int8_t * buf,
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u_int8_t * cbuf)
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{
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u_int32_t ctag;
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int len, dshift, lmask;
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int blen, boff;
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int i, j;
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int pos, cpos;
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len = GET_UINT16(cbuf) & 0xFFF;
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dprintf(("ntfs_uncompblock: block length: %d + 3, 0x%x,0x%04x\n",
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len, len, GET_UINT16(cbuf)));
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if (!(GET_UINT16(cbuf) & 0x8000)) {
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if ((len + 1) != NTFS_COMPBLOCK_SIZE) {
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dprintf(("ntfs_uncompblock: len: %x instead of %d\n",
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len, 0xfff));
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}
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memcpy(buf, cbuf + 2, len + 1);
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bzero(buf + len + 1, NTFS_COMPBLOCK_SIZE - 1 - len);
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return len + 3;
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}
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cpos = 2;
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pos = 0;
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while ((cpos < len + 3) && (pos < NTFS_COMPBLOCK_SIZE)) {
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ctag = cbuf[cpos++];
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for (i = 0; (i < 8) && (pos < NTFS_COMPBLOCK_SIZE); i++) {
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if (ctag & 1) {
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for (j = pos - 1, lmask = 0xFFF, dshift = 12;
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j >= 0x10; j >>= 1) {
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dshift--;
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lmask >>= 1;
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}
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boff = -1 - (GET_UINT16(cbuf + cpos) >> dshift);
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blen = 3 + (GET_UINT16(cbuf + cpos) & lmask);
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for (j = 0; (j < blen) && (pos < NTFS_COMPBLOCK_SIZE); j++) {
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buf[pos] = buf[pos + boff];
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pos++;
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}
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cpos += 2;
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} else {
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buf[pos++] = cbuf[cpos++];
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}
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ctag >>= 1;
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}
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}
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return len + 3;
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}
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int
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ntfs_uncompunit(
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struct ntfsmount * ntmp,
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u_int8_t * uup,
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u_int8_t * cup)
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{
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int i;
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int off = 0;
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int new;
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for (i = 0; i * NTFS_COMPBLOCK_SIZE < ntfs_cntob(NTFS_COMPUNIT_CL); i++) {
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new = ntfs_uncompblock(uup + i * NTFS_COMPBLOCK_SIZE, cup + off);
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if (new == 0)
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return (EINVAL);
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off += new;
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}
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return (0);
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}
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