Line data    Source code

       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           0 : 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           0 :         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           0 :         if (!(GET_UINT16(cbuf) & 0x8000)) {
      55           0 :                 if ((len + 1) != NTFS_COMPBLOCK_SIZE) {
      56             :                         DPRINTF("ntfs_uncompblock: len: %x instead of %d\n",
      57             :                             len, 0xfff);
      58             :                 }
      59           0 :                 memcpy(buf, cbuf + 2, len + 1);
      60           0 :                 bzero(buf + len + 1, NTFS_COMPBLOCK_SIZE - 1 - len);
      61           0 :                 return (len + 3);
      62             :         }
      63             :         cpos = 2;
      64             :         pos = 0;
      65           0 :         while ((cpos < len + 3) && (pos < NTFS_COMPBLOCK_SIZE)) {
      66           0 :                 ctag = cbuf[cpos++];
      67           0 :                 for (i = 0; (i < 8) && (pos < NTFS_COMPBLOCK_SIZE); i++) {
      68           0 :                         if (ctag & 1) {
      69           0 :                                 for (j = pos - 1, lmask = 0xFFF, dshift = 12;
      70           0 :                                      j >= 0x10; j >>= 1) {
      71           0 :                                         dshift--;
      72           0 :                                         lmask >>= 1;
      73             :                                 }
      74           0 :                                 boff = -1 - (GET_UINT16(cbuf + cpos) >> dshift);
      75           0 :                                 blen = 3 + (GET_UINT16(cbuf + cpos) & lmask);
      76           0 :                                 for (j = 0; (j < blen) &&
      77           0 :                                     (pos < NTFS_COMPBLOCK_SIZE); j++) {
      78           0 :                                         buf[pos] = buf[pos + boff];
      79           0 :                                         pos++;
      80             :                                 }
      81           0 :                                 cpos += 2;
      82           0 :                         } else {
      83           0 :                                 buf[pos++] = cbuf[cpos++];
      84             :                         }
      85           0 :                         ctag >>= 1;
      86             :                 }
      87             :         }
      88           0 :         return (len + 3);
      89           0 : }
      90             : 
      91             : int
      92           0 : 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           0 :         for (i = 0; i * NTFS_COMPBLOCK_SIZE < ntfs_cntob(NTFS_COMPUNIT_CL);
      99           0 :             i++) {
     100           0 :                 new = ntfs_uncompblock(uup + i * NTFS_COMPBLOCK_SIZE,
     101           0 :                     cup + off);
     102           0 :                 if (new == 0)
     103           0 :                         return (EINVAL);
     104           0 :                 off += new;
     105             :         }
     106           0 :         return (0);
     107           0 : }