[deliverable/linux.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>

struct lzo_ctx {
	void *lzo_comp_mem;
};

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

	ctx->lzo_comp_mem = kmalloc(LZO1X_MEM_COMPRESS,
				    GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
	if (!ctx->lzo_comp_mem)
		ctx->lzo_comp_mem = vmalloc(LZO1X_MEM_COMPRESS);
	if (!ctx->lzo_comp_mem)
		return -ENOMEM;

	return 0;
}

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

	if (is_vmalloc_addr(ctx->lzo_comp_mem))
		vfree(ctx->lzo_comp_mem);
	else
		kfree(ctx->lzo_comp_mem);
}

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);
	size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
	int err;

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

	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)
{
	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 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 int __init lzo_mod_init(void)
{
	return crypto_register_alg(&alg);
}

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

module_init(lzo_mod_init);
module_exit(lzo_mod_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("LZO Compression Algorithm");
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 ZS	24	#include <linux/lzo.h>
	25
	26	struct lzo_ctx {
	27	void *lzo_comp_mem;
	28	};
	29
	30	static int lzo_init(struct crypto_tfm *tfm)
	31	{
	32	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
	33
42614b05 ED	34	ctx->lzo_comp_mem = kmalloc(LZO1X_MEM_COMPRESS,
	35	GFP_KERNEL \| __GFP_NOWARN \| __GFP_REPEAT);
	36	if (!ctx->lzo_comp_mem)
	37	ctx->lzo_comp_mem = vmalloc(LZO1X_MEM_COMPRESS);
0b77abb3 ZS	38	if (!ctx->lzo_comp_mem)
	39	return -ENOMEM;
	40
	41	return 0;
	42	}
	43
	44	static void lzo_exit(struct crypto_tfm *tfm)
	45	{
	46	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
	47
42614b05 ED	48	if (is_vmalloc_addr(ctx->lzo_comp_mem))
	49	vfree(ctx->lzo_comp_mem);
	50	else
	51	kfree(ctx->lzo_comp_mem);
0b77abb3 ZS	52	}
	53
	54	static int lzo_compress(struct crypto_tfm tfm, const u8 src,
	55	unsigned int slen, u8 dst, unsigned int dlen)
	56	{
	57	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
	58	size_t tmp_len = dlen; / size_t(ulong) <-> uint on 64 bit */
	59	int err;
	60
	61	err = lzo1x_1_compress(src, slen, dst, &tmp_len, ctx->lzo_comp_mem);
	62
	63	if (err != LZO_E_OK)
	64	return -EINVAL;
	65
	66	*dlen = tmp_len;
	67	return 0;
	68	}
	69
	70	static int lzo_decompress(struct crypto_tfm tfm, const u8 src,
	71	unsigned int slen, u8 dst, unsigned int dlen)
	72	{
	73	int err;
	74	size_t tmp_len = dlen; / size_t(ulong) <-> uint on 64 bit */
	75
	76	err = lzo1x_decompress_safe(src, slen, dst, &tmp_len);
	77
	78	if (err != LZO_E_OK)
	79	return -EINVAL;
	80
	81	*dlen = tmp_len;
	82	return 0;
	83
	84	}
	85
	86	static struct crypto_alg alg = {
	87	.cra_name = "lzo",
	88	.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
	89	.cra_ctxsize = sizeof(struct lzo_ctx),
	90	.cra_module = THIS_MODULE,
0b77abb3 ZS	91	.cra_init = lzo_init,
	92	.cra_exit = lzo_exit,
	93	.cra_u = { .compress = {
	94	.coa_compress = lzo_compress,
	95	.coa_decompress = lzo_decompress } }
	96	};
	97
3af5b90b	98	static int __init lzo_mod_init(void)
0b77abb3 ZS	99	{
	100	return crypto_register_alg(&alg);
	101	}
	102
3af5b90b	103	static void __exit lzo_mod_fini(void)
0b77abb3 ZS	104	{
	105	crypto_unregister_alg(&alg);
	106	}
	107
3af5b90b KB	108	module_init(lzo_mod_init);
3af5b90b KB	109	module_exit(lzo_mod_fini);
0b77abb3 ZS	110
	111	MODULE_LICENSE("GPL");
	112	MODULE_DESCRIPTION("LZO Compression Algorithm");