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,
86 .cra_u = { .compress = {
87 .coa_compress = lzo_compress,
88 .coa_decompress = lzo_decompress } }
91 static int __init lzo_mod_init(void)
93 return crypto_register_alg(&alg);
96 static void __exit lzo_mod_fini(void)
98 crypto_unregister_alg(&alg);
101 module_init(lzo_mod_init);
102 module_exit(lzo_mod_fini);
104 MODULE_LICENSE("GPL");
105 MODULE_DESCRIPTION("LZO Compression Algorithm");