Linux-2.6.12-rc2
[linux-3.10.git] / crypto / compress.c
1 /*
2  * Cryptographic API.
3  *
4  * Compression operations.
5  *
6  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
7  *
8  * This program is free software; you can redistribute it and/or modify it
9  * under the terms of the GNU General Public License as published by the Free
10  * Software Foundation; either version 2 of the License, or (at your option) 
11  * any later version.
12  *
13  */
14 #include <linux/types.h>
15 #include <linux/crypto.h>
16 #include <linux/errno.h>
17 #include <asm/scatterlist.h>
18 #include <linux/string.h>
19 #include "internal.h"
20
21 static int crypto_compress(struct crypto_tfm *tfm,
22                             const u8 *src, unsigned int slen,
23                             u8 *dst, unsigned int *dlen)
24 {
25         return tfm->__crt_alg->cra_compress.coa_compress(crypto_tfm_ctx(tfm),
26                                                          src, slen, dst,
27                                                          dlen);
28 }
29
30 static int crypto_decompress(struct crypto_tfm *tfm,
31                              const u8 *src, unsigned int slen,
32                              u8 *dst, unsigned int *dlen)
33 {
34         return tfm->__crt_alg->cra_compress.coa_decompress(crypto_tfm_ctx(tfm),
35                                                            src, slen, dst,
36                                                            dlen);
37 }
38
39 int crypto_init_compress_flags(struct crypto_tfm *tfm, u32 flags)
40 {
41         return flags ? -EINVAL : 0;
42 }
43
44 int crypto_init_compress_ops(struct crypto_tfm *tfm)
45 {
46         int ret = 0;
47         struct compress_tfm *ops = &tfm->crt_compress;
48         
49         ret = tfm->__crt_alg->cra_compress.coa_init(crypto_tfm_ctx(tfm));
50         if (ret)
51                 goto out;
52
53         ops->cot_compress = crypto_compress;
54         ops->cot_decompress = crypto_decompress;
55         
56 out:
57         return ret;
58 }
59
60 void crypto_exit_compress_ops(struct crypto_tfm *tfm)
61 {
62         tfm->__crt_alg->cra_compress.coa_exit(crypto_tfm_ctx(tfm));
63 }