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TOMOYO Linux Cross Reference
Linux/crypto/lzo.c

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  1 /*
  2  * Cryptographic API.
  3  *
  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.
  7  *
  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
 11  * more details.
 12  *
 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
 16  *
 17  */
 18 
 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>
 24 
 25 struct lzo_ctx {
 26         void *lzo_comp_mem;
 27 };
 28 
 29 static int lzo_init(struct crypto_tfm *tfm)
 30 {
 31         struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
 32 
 33         ctx->lzo_comp_mem = vmalloc(LZO1X_MEM_COMPRESS);
 34         if (!ctx->lzo_comp_mem)
 35                 return -ENOMEM;
 36 
 37         return 0;
 38 }
 39 
 40 static void lzo_exit(struct crypto_tfm *tfm)
 41 {
 42         struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
 43 
 44         vfree(ctx->lzo_comp_mem);
 45 }
 46 
 47 static int lzo_compress(struct crypto_tfm *tfm, const u8 *src,
 48                             unsigned int slen, u8 *dst, unsigned int *dlen)
 49 {
 50         struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
 51         size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
 52         int err;
 53 
 54         err = lzo1x_1_compress(src, slen, dst, &tmp_len, ctx->lzo_comp_mem);
 55 
 56         if (err != LZO_E_OK)
 57                 return -EINVAL;
 58 
 59         *dlen = tmp_len;
 60         return 0;
 61 }
 62 
 63 static int lzo_decompress(struct crypto_tfm *tfm, const u8 *src,
 64                               unsigned int slen, u8 *dst, unsigned int *dlen)
 65 {
 66         int err;
 67         size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
 68 
 69         err = lzo1x_decompress_safe(src, slen, dst, &tmp_len);
 70 
 71         if (err != LZO_E_OK)
 72                 return -EINVAL;
 73 
 74         *dlen = tmp_len;
 75         return 0;
 76 
 77 }
 78 
 79 static struct crypto_alg alg = {
 80         .cra_name               = "lzo",
 81         .cra_flags              = CRYPTO_ALG_TYPE_COMPRESS,
 82         .cra_ctxsize            = sizeof(struct lzo_ctx),
 83         .cra_module             = THIS_MODULE,
 84         .cra_init               = lzo_init,
 85         .cra_exit               = lzo_exit,
 86         .cra_u                  = { .compress = {
 87         .coa_compress           = lzo_compress,
 88         .coa_decompress         = lzo_decompress } }
 89 };
 90 
 91 static int __init lzo_mod_init(void)
 92 {
 93         return crypto_register_alg(&alg);
 94 }
 95 
 96 static void __exit lzo_mod_fini(void)
 97 {
 98         crypto_unregister_alg(&alg);
 99 }
100 
101 module_init(lzo_mod_init);
102 module_exit(lzo_mod_fini);
103 
104 MODULE_LICENSE("GPL");
105 MODULE_DESCRIPTION("LZO Compression Algorithm");
106 

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