ntfs_compr.c revision 1.1.2.2
1 1.1.2.2 thorpej /* $NetBSD: ntfs_compr.c,v 1.1.2.2 2002/12/29 19:56:11 thorpej Exp $ */ 2 1.1.2.2 thorpej 3 1.1.2.2 thorpej /*- 4 1.1.2.2 thorpej * Copyright (c) 1998, 1999 Semen Ustimenko 5 1.1.2.2 thorpej * All rights reserved. 6 1.1.2.2 thorpej * 7 1.1.2.2 thorpej * Redistribution and use in source and binary forms, with or without 8 1.1.2.2 thorpej * modification, are permitted provided that the following conditions 9 1.1.2.2 thorpej * are met: 10 1.1.2.2 thorpej * 1. Redistributions of source code must retain the above copyright 11 1.1.2.2 thorpej * notice, this list of conditions and the following disclaimer. 12 1.1.2.2 thorpej * 2. Redistributions in binary form must reproduce the above copyright 13 1.1.2.2 thorpej * notice, this list of conditions and the following disclaimer in the 14 1.1.2.2 thorpej * documentation and/or other materials provided with the distribution. 15 1.1.2.2 thorpej * 16 1.1.2.2 thorpej * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 1.1.2.2 thorpej * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 1.1.2.2 thorpej * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 1.1.2.2 thorpej * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 1.1.2.2 thorpej * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 1.1.2.2 thorpej * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 1.1.2.2 thorpej * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 1.1.2.2 thorpej * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 1.1.2.2 thorpej * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 1.1.2.2 thorpej * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 1.1.2.2 thorpej * SUCH DAMAGE. 27 1.1.2.2 thorpej * 28 1.1.2.2 thorpej * Id: ntfs_compr.c,v 1.4 1999/05/12 09:42:54 semenu Exp 29 1.1.2.2 thorpej */ 30 1.1.2.2 thorpej 31 1.1.2.2 thorpej #include <sys/cdefs.h> 32 1.1.2.2 thorpej __KERNEL_RCSID(0, "$NetBSD: ntfs_compr.c,v 1.1.2.2 2002/12/29 19:56:11 thorpej Exp $"); 33 1.1.2.2 thorpej 34 1.1.2.2 thorpej #include <sys/param.h> 35 1.1.2.2 thorpej #include <sys/systm.h> 36 1.1.2.2 thorpej #include <sys/namei.h> 37 1.1.2.2 thorpej #include <sys/proc.h> 38 1.1.2.2 thorpej #include <sys/kernel.h> 39 1.1.2.2 thorpej #include <sys/vnode.h> 40 1.1.2.2 thorpej #include <sys/mount.h> 41 1.1.2.2 thorpej #include <sys/buf.h> 42 1.1.2.2 thorpej #include <sys/file.h> 43 1.1.2.2 thorpej #include <sys/malloc.h> 44 1.1.2.2 thorpej #ifdef __FreeBSD__ 45 1.1.2.2 thorpej #include <machine/clock.h> 46 1.1.2.2 thorpej #endif 47 1.1.2.2 thorpej 48 1.1.2.2 thorpej #include <miscfs/specfs/specdev.h> 49 1.1.2.2 thorpej 50 1.1.2.2 thorpej #include <fs/ntfs/ntfs.h> 51 1.1.2.2 thorpej #include <fs/ntfs/ntfs_compr.h> 52 1.1.2.2 thorpej 53 1.1.2.2 thorpej #define GET_UINT16(addr) (*((u_int16_t *)(addr))) 54 1.1.2.2 thorpej 55 1.1.2.2 thorpej int 56 1.1.2.2 thorpej ntfs_uncompblock( 57 1.1.2.2 thorpej u_int8_t * buf, 58 1.1.2.2 thorpej u_int8_t * cbuf) 59 1.1.2.2 thorpej { 60 1.1.2.2 thorpej u_int32_t ctag; 61 1.1.2.2 thorpej int len, dshift, lmask; 62 1.1.2.2 thorpej int blen, boff; 63 1.1.2.2 thorpej int i, j; 64 1.1.2.2 thorpej int pos, cpos; 65 1.1.2.2 thorpej 66 1.1.2.2 thorpej len = GET_UINT16(cbuf) & 0xFFF; 67 1.1.2.2 thorpej dprintf(("ntfs_uncompblock: block length: %d + 3, 0x%x,0x%04x\n", 68 1.1.2.2 thorpej len, len, GET_UINT16(cbuf))); 69 1.1.2.2 thorpej 70 1.1.2.2 thorpej if (!(GET_UINT16(cbuf) & 0x8000)) { 71 1.1.2.2 thorpej if ((len + 1) != NTFS_COMPBLOCK_SIZE) { 72 1.1.2.2 thorpej dprintf(("ntfs_uncompblock: len: %x instead of %d\n", 73 1.1.2.2 thorpej len, 0xfff)); 74 1.1.2.2 thorpej } 75 1.1.2.2 thorpej memcpy(buf, cbuf + 2, len + 1); 76 1.1.2.2 thorpej bzero(buf + len + 1, NTFS_COMPBLOCK_SIZE - 1 - len); 77 1.1.2.2 thorpej return len + 3; 78 1.1.2.2 thorpej } 79 1.1.2.2 thorpej cpos = 2; 80 1.1.2.2 thorpej pos = 0; 81 1.1.2.2 thorpej while ((cpos < len + 3) && (pos < NTFS_COMPBLOCK_SIZE)) { 82 1.1.2.2 thorpej ctag = cbuf[cpos++]; 83 1.1.2.2 thorpej for (i = 0; (i < 8) && (pos < NTFS_COMPBLOCK_SIZE); i++) { 84 1.1.2.2 thorpej if (ctag & 1) { 85 1.1.2.2 thorpej for (j = pos - 1, lmask = 0xFFF, dshift = 12; 86 1.1.2.2 thorpej j >= 0x10; j >>= 1) { 87 1.1.2.2 thorpej dshift--; 88 1.1.2.2 thorpej lmask >>= 1; 89 1.1.2.2 thorpej } 90 1.1.2.2 thorpej boff = -1 - (GET_UINT16(cbuf + cpos) >> dshift); 91 1.1.2.2 thorpej blen = 3 + (GET_UINT16(cbuf + cpos) & lmask); 92 1.1.2.2 thorpej for (j = 0; (j < blen) && (pos < NTFS_COMPBLOCK_SIZE); j++) { 93 1.1.2.2 thorpej buf[pos] = buf[pos + boff]; 94 1.1.2.2 thorpej pos++; 95 1.1.2.2 thorpej } 96 1.1.2.2 thorpej cpos += 2; 97 1.1.2.2 thorpej } else { 98 1.1.2.2 thorpej buf[pos++] = cbuf[cpos++]; 99 1.1.2.2 thorpej } 100 1.1.2.2 thorpej ctag >>= 1; 101 1.1.2.2 thorpej } 102 1.1.2.2 thorpej } 103 1.1.2.2 thorpej return len + 3; 104 1.1.2.2 thorpej } 105 1.1.2.2 thorpej 106 1.1.2.2 thorpej int 107 1.1.2.2 thorpej ntfs_uncompunit( 108 1.1.2.2 thorpej struct ntfsmount * ntmp, 109 1.1.2.2 thorpej u_int8_t * uup, 110 1.1.2.2 thorpej u_int8_t * cup) 111 1.1.2.2 thorpej { 112 1.1.2.2 thorpej int i; 113 1.1.2.2 thorpej int off = 0; 114 1.1.2.2 thorpej int new; 115 1.1.2.2 thorpej 116 1.1.2.2 thorpej for (i = 0; i * NTFS_COMPBLOCK_SIZE < ntfs_cntob(NTFS_COMPUNIT_CL); i++) { 117 1.1.2.2 thorpej new = ntfs_uncompblock(uup + i * NTFS_COMPBLOCK_SIZE, cup + off); 118 1.1.2.2 thorpej if (new == 0) 119 1.1.2.2 thorpej return (EINVAL); 120 1.1.2.2 thorpej off += new; 121 1.1.2.2 thorpej } 122 1.1.2.2 thorpej return (0); 123 1.1.2.2 thorpej } 124
Indexes created Fri Oct 03 14:09:59 GMT 2025