ntfs_compr.c

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    1 /*      $OpenBSD: ntfs_compr.c,v 1.7 2013/11/24 16:02:30 jsing 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/mount.h>
   35 
   36 #include <ntfs/ntfs.h>
   37 #include <ntfs/ntfs_compr.h>
   38 
   39 #define GET_UINT16(addr)        (*((u_int16_t *)(addr)))
   40 
   41 int
   42 ntfs_uncompblock(u_int8_t *buf, u_int8_t *cbuf)
   43 {
   44         u_int32_t ctag;
   45         int len, dshift, lmask;
   46         int blen, boff;
   47         int i, j;
   48         int pos, cpos;
   49 
   50         len = GET_UINT16(cbuf) & 0xFFF;
   51         DPRINTF("ntfs_uncompblock: block length: %d + 3, 0x%x,0x%04x\n",
   52             len, len, GET_UINT16(cbuf));
   53 
   54         if (!(GET_UINT16(cbuf) & 0x8000)) {
   55                 if ((len + 1) != NTFS_COMPBLOCK_SIZE) {
   56                         DPRINTF("ntfs_uncompblock: len: %x instead of %d\n",
   57                             len, 0xfff);
   58                 }
   59                 memcpy(buf, cbuf + 2, len + 1);
   60                 bzero(buf + len + 1, NTFS_COMPBLOCK_SIZE - 1 - len);
   61                 return (len + 3);
   62         }
   63         cpos = 2;
   64         pos = 0;
   65         while ((cpos < len + 3) && (pos < NTFS_COMPBLOCK_SIZE)) {
   66                 ctag = cbuf[cpos++];
   67                 for (i = 0; (i < 8) && (pos < NTFS_COMPBLOCK_SIZE); i++) {
   68                         if (ctag & 1) {
   69                                 for (j = pos - 1, lmask = 0xFFF, dshift = 12;
   70                                      j >= 0x10; j >>= 1) {
   71                                         dshift--;
   72                                         lmask >>= 1;
   73                                 }
   74                                 boff = -1 - (GET_UINT16(cbuf + cpos) >> dshift);
   75                                 blen = 3 + (GET_UINT16(cbuf + cpos) & lmask);
   76                                 for (j = 0; (j < blen) &&
   77                                     (pos < NTFS_COMPBLOCK_SIZE); j++) {
   78                                         buf[pos] = buf[pos + boff];
   79                                         pos++;
   80                                 }
   81                                 cpos += 2;
   82                         } else {
   83                                 buf[pos++] = cbuf[cpos++];
   84                         }
   85                         ctag >>= 1;
   86                 }
   87         }
   88         return (len + 3);
   89 }
   90 
   91 int
   92 ntfs_uncompunit(struct ntfsmount *ntmp, u_int8_t *uup, u_int8_t *cup)
   93 {
   94         int i;
   95         int off = 0;
   96         int new;
   97 
   98         for (i = 0; i * NTFS_COMPBLOCK_SIZE < ntfs_cntob(NTFS_COMPUNIT_CL);
   99             i++) {
  100                 new = ntfs_uncompblock(uup + i * NTFS_COMPBLOCK_SIZE,
  101                     cup + off);
  102                 if (new == 0)
  103                         return (EINVAL);
  104                 off += new;
  105         }
  106         return (0);
  107 }

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

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