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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - crypto/lzo.c
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>
24 #include <linux/lzo.h>
25 #include <crypto/internal/scompress.h>
31 static void *lzo_alloc_ctx(struct crypto_scomp
*tfm
)
35 ctx
= kvmalloc(LZO1X_MEM_COMPRESS
, GFP_KERNEL
);
37 return ERR_PTR(-ENOMEM
);
42 static int lzo_init(struct crypto_tfm
*tfm
)
44 struct lzo_ctx
*ctx
= crypto_tfm_ctx(tfm
);
46 ctx
->lzo_comp_mem
= lzo_alloc_ctx(NULL
);
47 if (IS_ERR(ctx
->lzo_comp_mem
))
53 static void lzo_free_ctx(struct crypto_scomp
*tfm
, void *ctx
)
58 static void lzo_exit(struct crypto_tfm
*tfm
)
60 struct lzo_ctx
*ctx
= crypto_tfm_ctx(tfm
);
62 lzo_free_ctx(NULL
, ctx
->lzo_comp_mem
);
65 static int __lzo_compress(const u8
*src
, unsigned int slen
,
66 u8
*dst
, unsigned int *dlen
, void *ctx
)
68 size_t tmp_len
= *dlen
; /* size_t(ulong) <-> uint on 64 bit */
71 err
= lzo1x_1_compress(src
, slen
, dst
, &tmp_len
, ctx
);
80 static int lzo_compress(struct crypto_tfm
*tfm
, const u8
*src
,
81 unsigned int slen
, u8
*dst
, unsigned int *dlen
)
83 struct lzo_ctx
*ctx
= crypto_tfm_ctx(tfm
);
85 return __lzo_compress(src
, slen
, dst
, dlen
, ctx
->lzo_comp_mem
);
88 static int lzo_scompress(struct crypto_scomp
*tfm
, const u8
*src
,
89 unsigned int slen
, u8
*dst
, unsigned int *dlen
,
92 return __lzo_compress(src
, slen
, dst
, dlen
, ctx
);
95 static int __lzo_decompress(const u8
*src
, unsigned int slen
,
96 u8
*dst
, unsigned int *dlen
)
99 size_t tmp_len
= *dlen
; /* size_t(ulong) <-> uint on 64 bit */
101 err
= lzo1x_decompress_safe(src
, slen
, dst
, &tmp_len
);
110 static int lzo_decompress(struct crypto_tfm
*tfm
, const u8
*src
,
111 unsigned int slen
, u8
*dst
, unsigned int *dlen
)
113 return __lzo_decompress(src
, slen
, dst
, dlen
);
116 static int lzo_sdecompress(struct crypto_scomp
*tfm
, const u8
*src
,
117 unsigned int slen
, u8
*dst
, unsigned int *dlen
,
120 return __lzo_decompress(src
, slen
, dst
, dlen
);
123 static struct crypto_alg alg
= {
125 .cra_flags
= CRYPTO_ALG_TYPE_COMPRESS
,
126 .cra_ctxsize
= sizeof(struct lzo_ctx
),
127 .cra_module
= THIS_MODULE
,
128 .cra_init
= lzo_init
,
129 .cra_exit
= lzo_exit
,
130 .cra_u
= { .compress
= {
131 .coa_compress
= lzo_compress
,
132 .coa_decompress
= lzo_decompress
} }
135 static struct scomp_alg scomp
= {
136 .alloc_ctx
= lzo_alloc_ctx
,
137 .free_ctx
= lzo_free_ctx
,
138 .compress
= lzo_scompress
,
139 .decompress
= lzo_sdecompress
,
142 .cra_driver_name
= "lzo-scomp",
143 .cra_module
= THIS_MODULE
,
147 static int __init
lzo_mod_init(void)
151 ret
= crypto_register_alg(&alg
);
155 ret
= crypto_register_scomp(&scomp
);
157 crypto_unregister_alg(&alg
);
164 static void __exit
lzo_mod_fini(void)
166 crypto_unregister_alg(&alg
);
167 crypto_unregister_scomp(&scomp
);
170 module_init(lzo_mod_init
);
171 module_exit(lzo_mod_fini
);
173 MODULE_LICENSE("GPL");
174 MODULE_DESCRIPTION("LZO Compression Algorithm");
175 MODULE_ALIAS_CRYPTO("lzo");