| | 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 $ |
| | 29 | */ |
| | 30 | |
| | 31 | #include <sys/param.h> |
| | 32 | #include <sys/systm.h> |
| | 33 | #include <sys/namei.h> |
| | 34 | #include <sys/proc.h> |
| | 35 | #include <sys/kernel.h> |
| | 36 | #include <sys/vnode.h> |
| | 37 | #include <sys/mount.h> |
| | 38 | #include <sys/buf.h> |
| | 39 | #include <sys/file.h> |
| | 40 | #include <sys/malloc.h> |
| | 41 | |
| | 42 | #if defined(__NetBSD__) |
| | 43 | #include <miscfs/specfs/specdev.h> |
| | 44 | #endif |
| | 45 | |
| | 46 | #include <ntfs/ntfs.h> |
| | 47 | #include <ntfs/ntfs_compr.h> |
| | 48 | |
| | 49 | #define GET_UINT16(addr) (*((u_int16_t *)(addr))) |
| | 50 | |
| | 51 | int |
| | 52 | ntfs_uncompblock( |
| | 53 | u_int8_t * buf, |
| | 54 | u_int8_t * cbuf) |
| | 55 | { |
| | 56 | u_int32_t ctag; |
| | 57 | int len, dshift, lmask; |
| | 58 | int blen, boff; |
| | 59 | int i, j; |
| | 60 | int pos, cpos; |
| | 61 | |
| | 62 | len = GET_UINT16(cbuf) & 0xFFF; |
| | 63 | dprintf(("ntfs_uncompblock: block length: %d + 3, 0x%x,0x%04x\n", |
| | 64 | len, len, GET_UINT16(cbuf))); |
| | 65 | |
| | 66 | if (!(GET_UINT16(cbuf) & 0x8000)) { |
| | 67 | if ((len + 1) != NTFS_COMPBLOCK_SIZE) { |
| | 68 | dprintf(("ntfs_uncompblock: len: %x instead of %d\n", |
| | 69 | len, 0xfff)); |
| | 70 | } |
| | 71 | memcpy(buf, cbuf + 2, len + 1); |
| | 72 | bzero(buf + len + 1, NTFS_COMPBLOCK_SIZE - 1 - len); |
| | 73 | return len + 3; |
| | 74 | } |
| | 75 | cpos = 2; |
| | 76 | pos = 0; |
| | 77 | while ((cpos < len + 3) && (pos < NTFS_COMPBLOCK_SIZE)) { |
| | 78 | ctag = cbuf[cpos++]; |
| | 79 | for (i = 0; (i < 8) && (pos < NTFS_COMPBLOCK_SIZE); i++) { |
| | 80 | if (ctag & 1) { |
| | 81 | for (j = pos - 1, lmask = 0xFFF, dshift = 12; |
| | 82 | j >= 0x10; j >>= 1) { |
| | 83 | dshift--; |
| | 84 | lmask >>= 1; |
| | 85 | } |
| | 86 | boff = -1 - (GET_UINT16(cbuf + cpos) >> dshift); |
| | 87 | blen = 3 + (GET_UINT16(cbuf + cpos) & lmask); |
| | 88 | for (j = 0; (j < blen) && (pos < NTFS_COMPBLOCK_SIZE); j++) { |
| | 89 | buf[pos] = buf[pos + boff]; |
| | 90 | pos++; |
| | 91 | } |
| | 92 | cpos += 2; |
| | 93 | } else { |
| | 94 | buf[pos++] = cbuf[cpos++]; |
| | 95 | } |
| | 96 | ctag >>= 1; |
| | 97 | } |
| | 98 | } |
| | 99 | return len + 3; |
| | 100 | } |
| | 101 | |
| | 102 | int |
| | 103 | ntfs_uncompunit( |
| | 104 | struct ntfsmount * ntmp, |
| | 105 | u_int8_t * uup, |
| | 106 | u_int8_t * cup) |
| | 107 | { |
| | 108 | int i; |
| | 109 | int off = 0; |
| | 110 | int new; |
| | 111 | |
| | 112 | for (i = 0; i * NTFS_COMPBLOCK_SIZE < ntfs_cntob(NTFS_COMPUNIT_CL); i++) { |
| | 113 | new = ntfs_uncompblock(uup + i * NTFS_COMPBLOCK_SIZE, cup + off); |
| | 114 | if (new == 0) |
| | 115 | return (EINVAL); |
| | 116 | off += new; |
| | 117 | } |
| | 118 | return (0); |
| | 119 | } |
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