[linux-2.6-block.git] / crypto / lzo.c

/*
 * Cryptographic API.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 *
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/crypto.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <linux/lzo.h>
#include <crypto/internal/scompress.h>

struct lzo_ctx {
	void *lzo_comp_mem;
};

static void *lzo_alloc_ctx(struct crypto_scomp *tfm)
{
	void *ctx;

	ctx = kvmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
	if (!ctx)
		return ERR_PTR(-ENOMEM);

	return ctx;
}

static int lzo_init(struct crypto_tfm *tfm)
{
	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);

	ctx->lzo_comp_mem = lzo_alloc_ctx(NULL);
	if (IS_ERR(ctx->lzo_comp_mem))
		return -ENOMEM;

	return 0;
}

static void lzo_free_ctx(struct crypto_scomp *tfm, void *ctx)
{
	kvfree(ctx);
}

static void lzo_exit(struct crypto_tfm *tfm)
{
	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);

	lzo_free_ctx(NULL, ctx->lzo_comp_mem);
}

static int __lzo_compress(const u8 *src, unsigned int slen,
			  u8 *dst, unsigned int *dlen, void *ctx)
{
	size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
	int err;

	err = lzo1x_1_compress(src, slen, dst, &tmp_len, ctx);

	if (err != LZO_E_OK)
		return -EINVAL;

	*dlen = tmp_len;
	return 0;
}

static int lzo_compress(struct crypto_tfm *tfm, const u8 *src,
			unsigned int slen, u8 *dst, unsigned int *dlen)
{
	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);

	return __lzo_compress(src, slen, dst, dlen, ctx->lzo_comp_mem);
}

static int lzo_scompress(struct crypto_scomp *tfm, const u8 *src,
			 unsigned int slen, u8 *dst, unsigned int *dlen,
			 void *ctx)
{
	return __lzo_compress(src, slen, dst, dlen, ctx);
}

static int __lzo_decompress(const u8 *src, unsigned int slen,
			    u8 *dst, unsigned int *dlen)
{
	int err;
	size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */

	err = lzo1x_decompress_safe(src, slen, dst, &tmp_len);

	if (err != LZO_E_OK)
		return -EINVAL;

	*dlen = tmp_len;
	return 0;
}

static int lzo_decompress(struct crypto_tfm *tfm, const u8 *src,
			  unsigned int slen, u8 *dst, unsigned int *dlen)
{
	return __lzo_decompress(src, slen, dst, dlen);
}

static int lzo_sdecompress(struct crypto_scomp *tfm, const u8 *src,
			   unsigned int slen, u8 *dst, unsigned int *dlen,
			   void *ctx)
{
	return __lzo_decompress(src, slen, dst, dlen);
}

static struct crypto_alg alg = {
	.cra_name		= "lzo",
	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
	.cra_ctxsize		= sizeof(struct lzo_ctx),
	.cra_module		= THIS_MODULE,
	.cra_init		= lzo_init,
	.cra_exit		= lzo_exit,
	.cra_u			= { .compress = {
	.coa_compress		= lzo_compress,
	.coa_decompress		= lzo_decompress } }
};

static struct scomp_alg scomp = {
	.alloc_ctx		= lzo_alloc_ctx,
	.free_ctx		= lzo_free_ctx,
	.compress		= lzo_scompress,
	.decompress		= lzo_sdecompress,
	.base			= {
		.cra_name	= "lzo",
		.cra_driver_name = "lzo-scomp",
		.cra_module	 = THIS_MODULE,
	}
};

static int __init lzo_mod_init(void)
{
	int ret;

	ret = crypto_register_alg(&alg);
	if (ret)
		return ret;

	ret = crypto_register_scomp(&scomp);
	if (ret) {
		crypto_unregister_alg(&alg);
		return ret;
	}

	return ret;
}

static void __exit lzo_mod_fini(void)
{
	crypto_unregister_alg(&alg);
	crypto_unregister_scomp(&scomp);
}

module_init(lzo_mod_init);
module_exit(lzo_mod_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("LZO Compression Algorithm");
MODULE_ALIAS_CRYPTO("lzo");
Commit	Line	Data
0b77abb3 ZS	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>
42614b05	23	#include <linux/mm.h>
0b77abb3	24	#include <linux/lzo.h>
ac9d2c4b	25	#include <crypto/internal/scompress.h>
0b77abb3 ZS	26
	27	struct lzo_ctx {
	28	void *lzo_comp_mem;
	29	};
	30
ac9d2c4b GC	31	static void lzo_alloc_ctx(struct crypto_scomp tfm)
	32	{
	33	void *ctx;
	34
752ade68	35	ctx = kvmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
ac9d2c4b GC	36	if (!ctx)
	37	return ERR_PTR(-ENOMEM);
	38
	39	return ctx;
	40	}
	41
0b77abb3 ZS	42	static int lzo_init(struct crypto_tfm *tfm)
	43	{
	44	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
	45
ac9d2c4b GC	46	ctx->lzo_comp_mem = lzo_alloc_ctx(NULL);
ac9d2c4b GC	47	if (IS_ERR(ctx->lzo_comp_mem))
0b77abb3 ZS	48	return -ENOMEM;
	49
	50	return 0;
	51	}
	52
ac9d2c4b GC	53	static void lzo_free_ctx(struct crypto_scomp tfm, void ctx)
	54	{
	55	kvfree(ctx);
	56	}
	57
0b77abb3 ZS	58	static void lzo_exit(struct crypto_tfm *tfm)
	59	{
	60	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
	61
ac9d2c4b	62	lzo_free_ctx(NULL, ctx->lzo_comp_mem);
0b77abb3 ZS	63	}
0b77abb3 ZS	64
ac9d2c4b GC	65	static int __lzo_compress(const u8 *src, unsigned int slen,
ac9d2c4b GC	66	u8 dst, unsigned int dlen, void *ctx)
0b77abb3	67	{
0b77abb3 ZS	68	size_t tmp_len = dlen; / size_t(ulong) <-> uint on 64 bit */
	69	int err;
	70
ac9d2c4b	71	err = lzo1x_1_compress(src, slen, dst, &tmp_len, ctx);
0b77abb3 ZS	72
	73	if (err != LZO_E_OK)
	74	return -EINVAL;
	75
	76	*dlen = tmp_len;
	77	return 0;
	78	}
	79
ac9d2c4b GC	80	static int lzo_compress(struct crypto_tfm tfm, const u8 src,
	81	unsigned int slen, u8 dst, unsigned int dlen)
	82	{
	83	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
	84
	85	return __lzo_compress(src, slen, dst, dlen, ctx->lzo_comp_mem);
	86	}
	87
	88	static int lzo_scompress(struct crypto_scomp tfm, const u8 src,
	89	unsigned int slen, u8 dst, unsigned int dlen,
	90	void *ctx)
	91	{
	92	return __lzo_compress(src, slen, dst, dlen, ctx);
	93	}
	94
	95	static int __lzo_decompress(const u8 *src, unsigned int slen,
	96	u8 dst, unsigned int dlen)
0b77abb3 ZS	97	{
	98	int err;
	99	size_t tmp_len = dlen; / size_t(ulong) <-> uint on 64 bit */
	100
	101	err = lzo1x_decompress_safe(src, slen, dst, &tmp_len);
	102
	103	if (err != LZO_E_OK)
	104	return -EINVAL;
	105
	106	*dlen = tmp_len;
	107	return 0;
ac9d2c4b	108	}
0b77abb3	109
ac9d2c4b GC	110	static int lzo_decompress(struct crypto_tfm tfm, const u8 src,
	111	unsigned int slen, u8 dst, unsigned int dlen)
	112	{
	113	return __lzo_decompress(src, slen, dst, dlen);
	114	}
	115
	116	static int lzo_sdecompress(struct crypto_scomp tfm, const u8 src,
	117	unsigned int slen, u8 dst, unsigned int dlen,
	118	void *ctx)
	119	{
	120	return __lzo_decompress(src, slen, dst, dlen);
0b77abb3 ZS	121	}
	122
	123	static struct crypto_alg alg = {
	124	.cra_name = "lzo",
	125	.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
	126	.cra_ctxsize = sizeof(struct lzo_ctx),
	127	.cra_module = THIS_MODULE,
0b77abb3 ZS	128	.cra_init = lzo_init,
	129	.cra_exit = lzo_exit,
	130	.cra_u = { .compress = {
ac9d2c4b GC	131	.coa_compress = lzo_compress,
	132	.coa_decompress = lzo_decompress } }
	133	};
	134
	135	static struct scomp_alg scomp = {
	136	.alloc_ctx = lzo_alloc_ctx,
	137	.free_ctx = lzo_free_ctx,
	138	.compress = lzo_scompress,
	139	.decompress = lzo_sdecompress,
	140	.base = {
	141	.cra_name = "lzo",
	142	.cra_driver_name = "lzo-scomp",
	143	.cra_module = THIS_MODULE,
	144	}
0b77abb3 ZS	145	};
0b77abb3 ZS	146
3af5b90b	147	static int __init lzo_mod_init(void)
0b77abb3	148	{
ac9d2c4b GC	149	int ret;
	150
	151	ret = crypto_register_alg(&alg);
	152	if (ret)
	153	return ret;
	154
	155	ret = crypto_register_scomp(&scomp);
	156	if (ret) {
	157	crypto_unregister_alg(&alg);
	158	return ret;
	159	}
	160
	161	return ret;
0b77abb3 ZS	162	}
0b77abb3 ZS	163
3af5b90b	164	static void __exit lzo_mod_fini(void)
0b77abb3 ZS	165	{
0b77abb3 ZS	166	crypto_unregister_alg(&alg);
ac9d2c4b	167	crypto_unregister_scomp(&scomp);
0b77abb3 ZS	168	}
0b77abb3 ZS	169
3af5b90b KB	170	module_init(lzo_mod_init);
3af5b90b KB	171	module_exit(lzo_mod_fini);
0b77abb3 ZS	172
	173	MODULE_LICENSE("GPL");
	174	MODULE_DESCRIPTION("LZO Compression Algorithm");
5d26a105	175	MODULE_ALIAS_CRYPTO("lzo");