From 6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 18:29:51 +0200
Subject: Adding upstream version 2.06.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 grub-core/fs/zfs/zfs_lzjb.c | 93 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 grub-core/fs/zfs/zfs_lzjb.c

(limited to 'grub-core/fs/zfs/zfs_lzjb.c')

diff --git a/grub-core/fs/zfs/zfs_lzjb.c b/grub-core/fs/zfs/zfs_lzjb.c
new file mode 100644
index 0000000..62b5ea6
--- /dev/null
+++ b/grub-core/fs/zfs/zfs_lzjb.c
@@ -0,0 +1,93 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 1999,2000,2001,2002,2003,2004,2009  Free Software Foundation, Inc.
+ *  Copyright 2007 Sun Microsystems, Inc.
+ *
+ *  GRUB is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/err.h>
+#include <grub/file.h>
+#include <grub/mm.h>
+#include <grub/misc.h>
+#include <grub/disk.h>
+#include <grub/dl.h>
+#include <grub/types.h>
+#include <grub/zfs/zfs.h>
+#include <grub/zfs/zio.h>
+#include <grub/zfs/dnode.h>
+#include <grub/zfs/uberblock_impl.h>
+#include <grub/zfs/vdev_impl.h>
+#include <grub/zfs/zio_checksum.h>
+#include <grub/zfs/zap_impl.h>
+#include <grub/zfs/zap_leaf.h>
+#include <grub/zfs/zfs_znode.h>
+#include <grub/zfs/dmu.h>
+#include <grub/zfs/dmu_objset.h>
+#include <grub/zfs/dsl_dir.h>
+#include <grub/zfs/dsl_dataset.h>
+
+#define	MATCH_BITS	6
+#define	MATCH_MIN	3
+#define	OFFSET_MASK	((1 << (16 - MATCH_BITS)) - 1)
+
+/*
+ * Decompression Entry - lzjb
+ */
+#ifndef	NBBY
+#define	NBBY	8
+#endif
+
+grub_err_t
+lzjb_decompress (void *s_start, void *d_start, grub_size_t s_len,
+		 grub_size_t d_len);
+
+grub_err_t
+lzjb_decompress (void *s_start, void *d_start, grub_size_t s_len,
+		 grub_size_t d_len)
+{
+  grub_uint8_t *src = s_start;
+  grub_uint8_t *dst = d_start;
+  grub_uint8_t *d_end = (grub_uint8_t *) d_start + d_len;
+  grub_uint8_t *s_end = (grub_uint8_t *) s_start + s_len;
+  grub_uint8_t *cpy, copymap = 0;
+  int copymask = 1 << (NBBY - 1);
+
+  while (dst < d_end && src < s_end)
+    {
+      if ((copymask <<= 1) == (1 << NBBY))
+	{
+	  copymask = 1;
+	  copymap = *src++;
+	}
+      if (src >= s_end)
+	return grub_error (GRUB_ERR_BAD_FS, "lzjb decompression failed");
+      if (copymap & copymask)
+	{
+	  int mlen = (src[0] >> (NBBY - MATCH_BITS)) + MATCH_MIN;
+	  int offset = ((src[0] << NBBY) | src[1]) & OFFSET_MASK;
+	  src += 2;
+	  cpy = dst - offset;
+	  if (src > s_end || cpy < (grub_uint8_t *) d_start)
+	    return grub_error (GRUB_ERR_BAD_FS, "lzjb decompression failed");
+	  while (--mlen >= 0 && dst < d_end)
+	    *dst++ = *cpy++;
+	}
+      else
+	*dst++ = *src++;
+    }
+  if (dst < d_end)
+    return grub_error (GRUB_ERR_BAD_FS, "lzjb decompression failed");
+  return GRUB_ERR_NONE;
+}
-- 
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