proc->thread stage 4: rework the VFS and DEVICE subsystems to take thread
[dragonfly.git] / sys / vfs / ntfs / ntfs_compr.c
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1/* $NetBSD: ntfs_compr.c,v 1.3 1999/07/26 14:02:31 jdolecek Exp $ */
2
3/*-
4 * Copyright (c) 1998, 1999 Semen Ustimenko
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD: src/sys/ntfs/ntfs_compr.c,v 1.7 1999/12/03 20:37:38 semenu Exp $
dadab5e9 29 * $DragonFly: src/sys/vfs/ntfs/ntfs_compr.c,v 1.3 2003/06/25 03:56:07 dillon Exp $
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30 */
31
32#include <sys/param.h>
33#include <sys/systm.h>
984263bc 34#include <sys/proc.h>
dadab5e9 35#include <sys/namei.h>
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36#include <sys/kernel.h>
37#include <sys/vnode.h>
38#include <sys/mount.h>
39#include <sys/buf.h>
40#include <sys/file.h>
41#include <sys/malloc.h>
42
43#if defined(__NetBSD__)
44#include <miscfs/specfs/specdev.h>
45#endif
46
47#include <ntfs/ntfs.h>
48#include <ntfs/ntfs_compr.h>
49
50#define GET_UINT16(addr) (*((u_int16_t *)(addr)))
51
52int
53ntfs_uncompblock(
54 u_int8_t * buf,
55 u_int8_t * cbuf)
56{
57 u_int32_t ctag;
58 int len, dshift, lmask;
59 int blen, boff;
60 int i, j;
61 int pos, cpos;
62
63 len = GET_UINT16(cbuf) & 0xFFF;
64 dprintf(("ntfs_uncompblock: block length: %d + 3, 0x%x,0x%04x\n",
65 len, len, GET_UINT16(cbuf)));
66
67 if (!(GET_UINT16(cbuf) & 0x8000)) {
68 if ((len + 1) != NTFS_COMPBLOCK_SIZE) {
69 dprintf(("ntfs_uncompblock: len: %x instead of %d\n",
70 len, 0xfff));
71 }
72 memcpy(buf, cbuf + 2, len + 1);
73 bzero(buf + len + 1, NTFS_COMPBLOCK_SIZE - 1 - len);
74 return len + 3;
75 }
76 cpos = 2;
77 pos = 0;
78 while ((cpos < len + 3) && (pos < NTFS_COMPBLOCK_SIZE)) {
79 ctag = cbuf[cpos++];
80 for (i = 0; (i < 8) && (pos < NTFS_COMPBLOCK_SIZE); i++) {
81 if (ctag & 1) {
82 for (j = pos - 1, lmask = 0xFFF, dshift = 12;
83 j >= 0x10; j >>= 1) {
84 dshift--;
85 lmask >>= 1;
86 }
87 boff = -1 - (GET_UINT16(cbuf + cpos) >> dshift);
88 blen = 3 + (GET_UINT16(cbuf + cpos) & lmask);
89 for (j = 0; (j < blen) && (pos < NTFS_COMPBLOCK_SIZE); j++) {
90 buf[pos] = buf[pos + boff];
91 pos++;
92 }
93 cpos += 2;
94 } else {
95 buf[pos++] = cbuf[cpos++];
96 }
97 ctag >>= 1;
98 }
99 }
100 return len + 3;
101}
102
103int
104ntfs_uncompunit(
105 struct ntfsmount * ntmp,
106 u_int8_t * uup,
107 u_int8_t * cup)
108{
109 int i;
110 int off = 0;
111 int new;
112
113 for (i = 0; i * NTFS_COMPBLOCK_SIZE < ntfs_cntob(NTFS_COMPUNIT_CL); i++) {
114 new = ntfs_uncompblock(uup + i * NTFS_COMPBLOCK_SIZE, cup + off);
115 if (new == 0)
116 return (EINVAL);
117 off += new;
118 }
119 return (0);
120}