1 /* $OpenBSD: ntfs_compr.c,v 1.3 2008/05/13 02:24:08 brad Exp $ */ 2 /* $NetBSD: ntfs_compr.c,v 1.1 2002/12/23 17:38:31 jdolecek Exp $ */ 3 4 /*- 5 * Copyright (c) 1998, 1999 Semen Ustimenko 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * Id: ntfs_compr.c,v 1.4 1999/05/12 09:42:54 semenu Exp 30 */ 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/namei.h> 35 #include <sys/proc.h> 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 #ifdef __FreeBSD__ 43 #include <machine/clock.h> 44 #endif 45 46 #include <miscfs/specfs/specdev.h> 47 48 #if defined(__FreeBSD__) || defined(__NetBSD__) 49 #include <fs/ntfs/ntfs.h> 50 #include <fs/ntfs/ntfs_compr.h> 51 #else 52 #include <ntfs/ntfs.h> 53 #include <ntfs/ntfs_compr.h> 54 #endif 55 56 #define GET_UINT16(addr) (*((u_int16_t *)(addr))) 57 58 int 59 ntfs_uncompblock( 60 u_int8_t * buf, 61 u_int8_t * cbuf) 62 { 63 u_int32_t ctag; 64 int len, dshift, lmask; 65 int blen, boff; 66 int i, j; 67 int pos, cpos; 68 69 len = GET_UINT16(cbuf) & 0xFFF; 70 dprintf(("ntfs_uncompblock: block length: %d + 3, 0x%x,0x%04x\n", 71 len, len, GET_UINT16(cbuf))); 72 73 if (!(GET_UINT16(cbuf) & 0x8000)) { 74 if ((len + 1) != NTFS_COMPBLOCK_SIZE) { 75 dprintf(("ntfs_uncompblock: len: %x instead of %d\n", 76 len, 0xfff)); 77 } 78 memcpy(buf, cbuf + 2, len + 1); 79 bzero(buf + len + 1, NTFS_COMPBLOCK_SIZE - 1 - len); 80 return len + 3; 81 } 82 cpos = 2; 83 pos = 0; 84 while ((cpos < len + 3) && (pos < NTFS_COMPBLOCK_SIZE)) { 85 ctag = cbuf[cpos++]; 86 for (i = 0; (i < 8) && (pos < NTFS_COMPBLOCK_SIZE); i++) { 87 if (ctag & 1) { 88 for (j = pos - 1, lmask = 0xFFF, dshift = 12; 89 j >= 0x10; j >>= 1) { 90 dshift--; 91 lmask >>= 1; 92 } 93 boff = -1 - (GET_UINT16(cbuf + cpos) >> dshift); 94 blen = 3 + (GET_UINT16(cbuf + cpos) & lmask); 95 for (j = 0; (j < blen) && (pos < NTFS_COMPBLOCK_SIZE); j++) { 96 buf[pos] = buf[pos + boff]; 97 pos++; 98 } 99 cpos += 2; 100 } else { 101 buf[pos++] = cbuf[cpos++]; 102 } 103 ctag >>= 1; 104 } 105 } 106 return len + 3; 107 } 108 109 int 110 ntfs_uncompunit( 111 struct ntfsmount * ntmp, 112 u_int8_t * uup, 113 u_int8_t * cup) 114 { 115 int i; 116 int off = 0; 117 int new; 118 119 for (i = 0; i * NTFS_COMPBLOCK_SIZE < ntfs_cntob(NTFS_COMPUNIT_CL); i++) { 120 new = ntfs_uncompblock(uup + i * NTFS_COMPBLOCK_SIZE, cup + off); 121 if (new == 0) 122 return (EINVAL); 123 off += new; 124 } 125 return (0); 126 } 127