4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 as published by
6 * the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 #include <linux/init.h>
20 #include <linux/module.h>
21 #include <linux/crypto.h>
22 #include <linux/vmalloc.h>
23 #include <linux/lzo.h>
29 static int lzo_init(struct crypto_tfm
*tfm
)
31 struct lzo_ctx
*ctx
= crypto_tfm_ctx(tfm
);
33 ctx
->lzo_comp_mem
= vmalloc(LZO1X_MEM_COMPRESS
);
34 if (!ctx
->lzo_comp_mem
)
40 static void lzo_exit(struct crypto_tfm
*tfm
)
42 struct lzo_ctx
*ctx
= crypto_tfm_ctx(tfm
);
44 vfree(ctx
->lzo_comp_mem
);
47 static int lzo_compress(struct crypto_tfm
*tfm
, const u8
*src
,
48 unsigned int slen
, u8
*dst
, unsigned int *dlen
)
50 struct lzo_ctx
*ctx
= crypto_tfm_ctx(tfm
);
51 size_t tmp_len
= *dlen
; /* size_t(ulong) <-> uint on 64 bit */
54 err
= lzo1x_1_compress(src
, slen
, dst
, &tmp_len
, ctx
->lzo_comp_mem
);
63 static int lzo_decompress(struct crypto_tfm
*tfm
, const u8
*src
,
64 unsigned int slen
, u8
*dst
, unsigned int *dlen
)
67 size_t tmp_len
= *dlen
; /* size_t(ulong) <-> uint on 64 bit */
69 err
= lzo1x_decompress_safe(src
, slen
, dst
, &tmp_len
);
79 static struct crypto_alg alg
= {
81 .cra_flags
= CRYPTO_ALG_TYPE_COMPRESS
,
82 .cra_ctxsize
= sizeof(struct lzo_ctx
),
83 .cra_module
= THIS_MODULE
,
84 .cra_list
= LIST_HEAD_INIT(alg
.cra_list
),
87 .cra_u
= { .compress
= {
88 .coa_compress
= lzo_compress
,
89 .coa_decompress
= lzo_decompress
} }
92 static int __init
lzo_mod_init(void)
94 return crypto_register_alg(&alg
);
97 static void __exit
lzo_mod_fini(void)
99 crypto_unregister_alg(&alg
);
102 module_init(lzo_mod_init
);
103 module_exit(lzo_mod_fini
);
105 MODULE_LICENSE("GPL");
106 MODULE_DESCRIPTION("LZO Compression Algorithm");
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