diff options
Diffstat (limited to 'sys/ntfs/ntfs_compr.c')
| -rw-r--r-- | sys/ntfs/ntfs_compr.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/sys/ntfs/ntfs_compr.c b/sys/ntfs/ntfs_compr.c new file mode 100644 index 0000000..a096ba6 --- /dev/null +++ b/sys/ntfs/ntfs_compr.c @@ -0,0 +1,116 @@ +/*- + * Copyright (c) 1998, 1999 Semen Ustimenko + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $Id: ntfs_compr.c,v 1.4 1999/02/02 01:54:54 semen Exp $ + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/namei.h> +#include <sys/proc.h> +#include <sys/kernel.h> +#include <sys/vnode.h> +#include <sys/mount.h> +#include <sys/buf.h> +#include <sys/file.h> +#include <sys/malloc.h> +#include <machine/clock.h> + +#include <miscfs/specfs/specdev.h> + +#include <ntfs/ntfs.h> +#include <ntfs/ntfs_compr.h> + +#define GET_UINT16(addr) (*((u_int16_t *)(addr))) + +int +ntfs_uncompblock( + u_int8_t * buf, + const u_int8_t * cbuf) +{ + u_int32_t ctag; + int len, dshift, lmask; + int blen, boff; + int i, j; + int pos, cpos; + + len = GET_UINT16(cbuf) & 0xFFF; + dprintf(("ntfs_uncompblock: block length: %d + 3, 0x%x,0x%04x\n", + len, len, GET_UINT16(cbuf))); + + if (!(GET_UINT16(cbuf) & 0x8000)) { + if ((len + 1) != NTFS_COMPBLOCK_SIZE) { + dprintf(("ntfs_uncompblock: len: %x instead of %d\n", + len, 0xfff)); + } + memcpy(buf, cbuf + 2, len + 1); + bzero(buf + len + 1, NTFS_COMPBLOCK_SIZE - 1 - len); + return len + 3; + } + cpos = 2; + pos = 0; + while ((cpos < len + 3) && (pos < NTFS_COMPBLOCK_SIZE)) { + ctag = cbuf[cpos++]; + for (i = 0; (i < 8) && (pos < NTFS_COMPBLOCK_SIZE); i++) { + if (ctag & 1) { + for (j = pos - 1, lmask = 0xFFF, dshift = 12; + j >= 0x10; j >>= 1) { + dshift--; + lmask >>= 1; + } + boff = -1 - (GET_UINT16(cbuf + cpos) >> dshift); + blen = 3 + (GET_UINT16(cbuf + cpos) & lmask); + for (j = 0; (j < blen) && (pos < NTFS_COMPBLOCK_SIZE); j++) { + buf[pos] = buf[pos + boff]; + pos++; + } + cpos += 2; + } else { + buf[pos++] = cbuf[cpos++]; + } + ctag >>= 1; + } + } + return len + 3; +} + +int +ntfs_uncompunit( + struct ntfsmount * ntmp, + u_int8_t * uup, + const u_int8_t * cup) +{ + int i; + int off = 0; + int new; + + for (i = 0; i * NTFS_COMPBLOCK_SIZE < ntfs_cntob(NTFS_COMPUNIT_CL); i++) { + new = ntfs_uncompblock(uup + i * NTFS_COMPBLOCK_SIZE, cup + off); + if (new == 0) + return (EINVAL); + off += new; + } + return (0); +} |
