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Support zle compression on ZFS.

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* grub-core/fs/zfs/zfs.c (zle_decompress): New function.
	(decomp_table): Add zle.
	* include/grub/zfs/zio.h (zio_compress): Add zle.
This commit is contained in:
Vladimir 'phcoder' Serbinenko 2011-11-05 14:50:53 +01:00
parent c7ba4f6984
commit b632b404e0
3 changed files with 43 additions and 0 deletions
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8
ChangeLog
View file

@ -1,3 +1,11 @@
2011-11-05 Vladimir Serbinenko <phcoder@gmail.com>
Support zle compression on ZFS.
* grub-core/fs/zfs/zfs.c (zle_decompress): New function.
(decomp_table): Add zle.
* include/grub/zfs/zio.h (zio_compress): Add zle.
2011-11-05 Vladimir Serbinenko <phcoder@gmail.com>
Support BtrFS embedding.

34
grub-core/fs/zfs/zfs.c
View file

@ -199,6 +199,39 @@ zlib_decompress (void *s, void *d,
return GRUB_ERR_NONE;
}
static grub_err_t
zle_decompress (void *s, void *d,
grub_size_t slen, grub_size_t dlen)
{
grub_uint8_t *iptr, *optr;
grub_size_t clen;
for (iptr = s, optr = d; iptr < (grub_uint8_t *) s + slen
&& optr < (grub_uint8_t *) d + dlen;)
{
if (*iptr & 0x80)
clen = ((*iptr) & 0x7f) + 0x41;
else
clen = ((*iptr) & 0x3f) + 1;
if ((grub_ssize_t) clen > (grub_uint8_t *) d + dlen - optr)
clen = (grub_uint8_t *) d + dlen - optr;
if (*iptr & 0x40 || *iptr & 0x80)
{
grub_memset (optr, 0, clen);
iptr++;
optr += clen;
continue;
}
if ((grub_ssize_t) clen > (grub_uint8_t *) s + slen - iptr - 1)
clen = (grub_uint8_t *) s + slen - iptr - 1;
grub_memcpy (optr, iptr + 1, clen);
optr += clen;
iptr += clen + 1;
}
if (optr < (grub_uint8_t *) d + dlen)
grub_memset (optr, 0, (grub_uint8_t *) d + dlen - optr);
return GRUB_ERR_NONE;
}
static decomp_entry_t decomp_table[ZIO_COMPRESS_FUNCTIONS] = {
{"inherit", NULL}, /* ZIO_COMPRESS_INHERIT */
{"on", lzjb_decompress}, /* ZIO_COMPRESS_ON */
@ -214,6 +247,7 @@ static decomp_entry_t decomp_table[ZIO_COMPRESS_FUNCTIONS] = {
{"gzip-7", zlib_decompress}, /* ZIO_COMPRESS_GZIP7 */
{"gzip-8", zlib_decompress}, /* ZIO_COMPRESS_GZIP8 */
{"gzip-9", zlib_decompress}, /* ZIO_COMPRESS_GZIP9 */
{"zle", zle_decompress}, /* ZIO_COMPRESS_ZLE */
};
static grub_err_t zio_read_data (blkptr_t * bp, grub_zfs_endian_t endian,

1
include/grub/zfs/zio.h
View file

@ -86,6 +86,7 @@ enum zio_compress {
ZIO_COMPRESS_GZIP7,
ZIO_COMPRESS_GZIP8,
ZIO_COMPRESS_GZIP9,
ZIO_COMPRESS_ZLE,
ZIO_COMPRESS_FUNCTIONS
};