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README
(616 B)
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blkptr.c
(2.21 KB)
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fletcher.c
(2.4 KB)
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lzjb.c
(2.29 KB)
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sha256.c
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skein_zfs.c
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zfsimpl.h
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zfssubr.c
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zle.c
(1.66 KB)
Editing: lzjb.c
/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2007 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /*#pragma ident "%Z%%M% %I% %E% SMI"*/ /* * We keep our own copy of this algorithm for 2 main reasons: * 1. If we didn't, anyone modifying common/os/compress.c would * directly break our on disk format * 2. Our version of lzjb does not have a number of checks that the * common/os version needs and uses * In particular, we are adding the "feature" that compress() can * take a destination buffer size and return -1 if the data will not * compress to d_len or less. */ #define MATCH_BITS 6 #define MATCH_MIN 3 #define MATCH_MAX ((1 << MATCH_BITS) + (MATCH_MIN - 1)) #define OFFSET_MASK ((1 << (16 - MATCH_BITS)) - 1) #define LEMPEL_SIZE 256 /*ARGSUSED*/ static int lzjb_decompress(void *s_start, void *d_start, size_t s_len, size_t d_len, int n) { unsigned char *src = s_start; unsigned char *dst = d_start; unsigned char *d_end = (unsigned char *)d_start + d_len; unsigned char *cpy, copymap = 0; int copymask = 1 << (NBBY - 1); while (dst < d_end) { if ((copymask <<= 1) == (1 << NBBY)) { copymask = 1; copymap = *src++; } if (copymap & copymask) { int mlen = (src[0] >> (NBBY - MATCH_BITS)) + MATCH_MIN; int offset = ((src[0] << NBBY) | src[1]) & OFFSET_MASK; src += 2; if ((cpy = dst - offset) < (unsigned char *)d_start) return (-1); while (--mlen >= 0 && dst < d_end) *dst++ = *cpy++; } else { *dst++ = *src++; } } return (0); }
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