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Diffstat (limited to 'grub-core/fs/zfs/zfs_lzjb.c')
-rw-r--r--grub-core/fs/zfs/zfs_lzjb.c93
1 files changed, 93 insertions, 0 deletions
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;
+}