1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * Synchronous Compression operations
4  *
5  * Copyright 2015 LG Electronics Inc.
6  * Copyright (c) 2016, Intel Corporation
7  * Author: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
8  */
9 #ifndef _CRYPTO_SCOMP_INT_H
10 #define _CRYPTO_SCOMP_INT_H
11 
12 #include <crypto/acompress.h>
13 #include <crypto/algapi.h>
14 
15 #define SCOMP_SCRATCH_SIZE	131072
16 
17 struct acomp_req;
18 
19 struct crypto_scomp {
20 	struct crypto_tfm base;
21 };
22 
23 /**
24  * struct scomp_alg - synchronous compression algorithm
25  *
26  * @alloc_ctx:	Function allocates algorithm specific context
27  * @free_ctx:	Function frees context allocated with alloc_ctx
28  * @compress:	Function performs a compress operation
29  * @decompress:	Function performs a de-compress operation
30  * @stat:	Statistics for compress algorithm
31  * @base:	Common crypto API algorithm data structure
32  * @calg:	Cmonn algorithm data structure shared with acomp
33  */
34 struct scomp_alg {
35 	void *(*alloc_ctx)(struct crypto_scomp *tfm);
36 	void (*free_ctx)(struct crypto_scomp *tfm, void *ctx);
37 	int (*compress)(struct crypto_scomp *tfm, const u8 *src,
38 			unsigned int slen, u8 *dst, unsigned int *dlen,
39 			void *ctx);
40 	int (*decompress)(struct crypto_scomp *tfm, const u8 *src,
41 			  unsigned int slen, u8 *dst, unsigned int *dlen,
42 			  void *ctx);
43 
44 	union {
45 		struct COMP_ALG_COMMON;
46 		struct comp_alg_common calg;
47 	};
48 };
49 
50 static inline struct scomp_alg *__crypto_scomp_alg(struct crypto_alg *alg)
51 {
52 	return container_of(alg, struct scomp_alg, base);
53 }
54 
55 static inline struct crypto_scomp *__crypto_scomp_tfm(struct crypto_tfm *tfm)
56 {
57 	return container_of(tfm, struct crypto_scomp, base);
58 }
59 
60 static inline struct crypto_tfm *crypto_scomp_tfm(struct crypto_scomp *tfm)
61 {
62 	return &tfm->base;
63 }
64 
65 static inline void crypto_free_scomp(struct crypto_scomp *tfm)
66 {
67 	crypto_destroy_tfm(tfm, crypto_scomp_tfm(tfm));
68 }
69 
70 static inline struct scomp_alg *crypto_scomp_alg(struct crypto_scomp *tfm)
71 {
72 	return __crypto_scomp_alg(crypto_scomp_tfm(tfm)->__crt_alg);
73 }
74 
75 static inline void *crypto_scomp_alloc_ctx(struct crypto_scomp *tfm)
76 {
77 	return crypto_scomp_alg(tfm)->alloc_ctx(tfm);
78 }
79 
80 static inline void crypto_scomp_free_ctx(struct crypto_scomp *tfm,
81 					 void *ctx)
82 {
83 	return crypto_scomp_alg(tfm)->free_ctx(tfm, ctx);
84 }
85 
86 static inline int crypto_scomp_compress(struct crypto_scomp *tfm,
87 					const u8 *src, unsigned int slen,
88 					u8 *dst, unsigned int *dlen, void *ctx)
89 {
90 	return crypto_scomp_alg(tfm)->compress(tfm, src, slen, dst, dlen, ctx);
91 }
92 
93 static inline int crypto_scomp_decompress(struct crypto_scomp *tfm,
94 					  const u8 *src, unsigned int slen,
95 					  u8 *dst, unsigned int *dlen,
96 					  void *ctx)
97 {
98 	return crypto_scomp_alg(tfm)->decompress(tfm, src, slen, dst, dlen,
99 						 ctx);
100 }
101 
102 /**
103  * crypto_register_scomp() -- Register synchronous compression algorithm
104  *
105  * Function registers an implementation of a synchronous
106  * compression algorithm
107  *
108  * @alg:	algorithm definition
109  *
110  * Return: zero on success; error code in case of error
111  */
112 int crypto_register_scomp(struct scomp_alg *alg);
113 
114 /**
115  * crypto_unregister_scomp() -- Unregister synchronous compression algorithm
116  *
117  * Function unregisters an implementation of a synchronous
118  * compression algorithm
119  *
120  * @alg:	algorithm definition
121  */
122 void crypto_unregister_scomp(struct scomp_alg *alg);
123 
124 int crypto_register_scomps(struct scomp_alg *algs, int count);
125 void crypto_unregister_scomps(struct scomp_alg *algs, int count);
126 
127 #endif
128