4 * Copyright (c) 2013 Chanho Min <chanho.min@lge.com>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc., 51
17 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/crypto.h>
24 #include <linux/vmalloc.h>
25 #include <linux/lz4.h>
31 static int lz4_init(struct crypto_tfm
*tfm
)
33 struct lz4_ctx
*ctx
= crypto_tfm_ctx(tfm
);
35 ctx
->lz4_comp_mem
= vmalloc(LZ4_MEM_COMPRESS
);
36 if (!ctx
->lz4_comp_mem
)
42 static void lz4_exit(struct crypto_tfm
*tfm
)
44 struct lz4_ctx
*ctx
= crypto_tfm_ctx(tfm
);
45 vfree(ctx
->lz4_comp_mem
);
48 static int lz4_compress_crypto(struct crypto_tfm
*tfm
, const u8
*src
,
49 unsigned int slen
, u8
*dst
, unsigned int *dlen
)
51 struct lz4_ctx
*ctx
= crypto_tfm_ctx(tfm
);
52 size_t tmp_len
= *dlen
;
55 err
= lz4_compress(src
, slen
, dst
, &tmp_len
, ctx
->lz4_comp_mem
);
64 static int lz4_decompress_crypto(struct crypto_tfm
*tfm
, const u8
*src
,
65 unsigned int slen
, u8
*dst
, unsigned int *dlen
)
68 size_t tmp_len
= *dlen
;
71 err
= lz4_decompress(src
, &__slen
, dst
, tmp_len
);
79 static struct crypto_alg alg_lz4
= {
81 .cra_flags
= CRYPTO_ALG_TYPE_COMPRESS
,
82 .cra_ctxsize
= sizeof(struct lz4_ctx
),
83 .cra_module
= THIS_MODULE
,
84 .cra_list
= LIST_HEAD_INIT(alg_lz4
.cra_list
),
87 .cra_u
= { .compress
= {
88 .coa_compress
= lz4_compress_crypto
,
89 .coa_decompress
= lz4_decompress_crypto
} }
92 static int __init
lz4_mod_init(void)
94 return crypto_register_alg(&alg_lz4
);
97 static void __exit
lz4_mod_fini(void)
99 crypto_unregister_alg(&alg_lz4
);
102 module_init(lz4_mod_init
);
103 module_exit(lz4_mod_fini
);
105 MODULE_LICENSE("GPL");
106 MODULE_DESCRIPTION("LZ4 Compression Algorithm");
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