ntfs_compr.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10

    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  * $FreeBSD$
   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 }

Cache object: e59d7fbaa640c56c145fe692e7106ab4

[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.

FreeBSD/Linux Kernel Cross Reference sys/ntfs/ntfs_compr.c

FreeBSD/Linux Kernel Cross Reference
sys/ntfs/ntfs_compr.c