/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/*
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* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#include <common.h>
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#include <malloc.h>
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#include <linux/stat.h>
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#include <linux/time.h>
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#include <linux/ctype.h>
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#include <asm/byteorder.h>
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#include "zfs_common.h"
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#include <zfs/zfs.h>
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#include <zfs/zio.h>
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#include <zfs/dnode.h>
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#include <zfs/uberblock_impl.h>
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#include <zfs/vdev_impl.h>
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#include <zfs/zio_checksum.h>
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#include <zfs/zap_impl.h>
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#include <zfs/zap_leaf.h>
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#include <zfs/zfs_znode.h>
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#include <zfs/dmu.h>
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#include <zfs/dmu_objset.h>
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#include <zfs/dsl_dir.h>
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#include <zfs/dsl_dataset.h>
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#define MATCH_BITS 6
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#define MATCH_MIN 3
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#define OFFSET_MASK ((1 << (16 - MATCH_BITS)) - 1)
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/*
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* Decompression Entry - lzjb
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*/
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#ifndef NBBY
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#define NBBY 8
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#endif
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int
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lzjb_decompress(void *s_start, void *d_start, uint32_t s_len,
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uint32_t d_len)
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{
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uint8_t *src = s_start;
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uint8_t *dst = d_start;
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uint8_t *d_end = (uint8_t *) d_start + d_len;
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uint8_t *s_end = (uint8_t *) s_start + s_len;
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uint8_t *cpy, copymap = 0;
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int copymask = 1 << (NBBY - 1);
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while (dst < d_end && src < s_end) {
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if ((copymask <<= 1) == (1 << NBBY)) {
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copymask = 1;
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copymap = *src++;
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}
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if (src >= s_end) {
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printf("lzjb decompression failed\n");
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return ZFS_ERR_BAD_FS;
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}
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if (copymap & copymask) {
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int mlen = (src[0] >> (NBBY - MATCH_BITS)) + MATCH_MIN;
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int offset = ((src[0] << NBBY) | src[1]) & OFFSET_MASK;
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src += 2;
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cpy = dst - offset;
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if (src > s_end || cpy < (uint8_t *) d_start) {
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printf("lzjb decompression failed\n");
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return ZFS_ERR_BAD_FS;
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}
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while (--mlen >= 0 && dst < d_end)
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*dst++ = *cpy++;
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} else {
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*dst++ = *src++;
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}
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}
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if (dst < d_end) {
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printf("lzjb decompression failed\n");
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return ZFS_ERR_BAD_FS;
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}
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return ZFS_ERR_NONE;
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}
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