1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Cryptographic API.
4 */
5
6 #include <crypto/internal/scompress.h>
7 #include <linux/init.h>
8 #include <linux/lzo.h>
9 #include <linux/module.h>
10 #include <linux/slab.h>
11
lzorle_alloc_ctx(void)12 static void *lzorle_alloc_ctx(void)
13 {
14 void *ctx;
15
16 ctx = kvmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
17 if (!ctx)
18 return ERR_PTR(-ENOMEM);
19
20 return ctx;
21 }
22
lzorle_free_ctx(void * ctx)23 static void lzorle_free_ctx(void *ctx)
24 {
25 kvfree(ctx);
26 }
27
__lzorle_compress(const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen,void * ctx)28 static int __lzorle_compress(const u8 *src, unsigned int slen,
29 u8 *dst, unsigned int *dlen, void *ctx)
30 {
31 size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
32 int err;
33
34 err = lzorle1x_1_compress_safe(src, slen, dst, &tmp_len, ctx);
35
36 if (err != LZO_E_OK)
37 return -EINVAL;
38
39 *dlen = tmp_len;
40 return 0;
41 }
42
lzorle_scompress(struct crypto_scomp * tfm,const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen,void * ctx)43 static int lzorle_scompress(struct crypto_scomp *tfm, const u8 *src,
44 unsigned int slen, u8 *dst, unsigned int *dlen,
45 void *ctx)
46 {
47 return __lzorle_compress(src, slen, dst, dlen, ctx);
48 }
49
__lzorle_decompress(const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen)50 static int __lzorle_decompress(const u8 *src, unsigned int slen,
51 u8 *dst, unsigned int *dlen)
52 {
53 int err;
54 size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
55
56 err = lzo1x_decompress_safe(src, slen, dst, &tmp_len);
57
58 if (err != LZO_E_OK)
59 return -EINVAL;
60
61 *dlen = tmp_len;
62 return 0;
63 }
64
lzorle_sdecompress(struct crypto_scomp * tfm,const u8 * src,unsigned int slen,u8 * dst,unsigned int * dlen,void * ctx)65 static int lzorle_sdecompress(struct crypto_scomp *tfm, const u8 *src,
66 unsigned int slen, u8 *dst, unsigned int *dlen,
67 void *ctx)
68 {
69 return __lzorle_decompress(src, slen, dst, dlen);
70 }
71
72 static struct scomp_alg scomp = {
73 .alloc_ctx = lzorle_alloc_ctx,
74 .free_ctx = lzorle_free_ctx,
75 .compress = lzorle_scompress,
76 .decompress = lzorle_sdecompress,
77 .base = {
78 .cra_name = "lzo-rle",
79 .cra_driver_name = "lzo-rle-scomp",
80 .cra_module = THIS_MODULE,
81 }
82 };
83
lzorle_mod_init(void)84 static int __init lzorle_mod_init(void)
85 {
86 return crypto_register_scomp(&scomp);
87 }
88
lzorle_mod_fini(void)89 static void __exit lzorle_mod_fini(void)
90 {
91 crypto_unregister_scomp(&scomp);
92 }
93
94 module_init(lzorle_mod_init);
95 module_exit(lzorle_mod_fini);
96
97 MODULE_LICENSE("GPL");
98 MODULE_DESCRIPTION("LZO-RLE Compression Algorithm");
99 MODULE_ALIAS_CRYPTO("lzo-rle");
100