0ea8530dcf
Add support for lz4 and lz4hc compression algorithm using the lib/lz4/* codebase. [akpm@linux-foundation.org: fix warnings] Signed-off-by: Chanho Min <chanho.min@lge.com> Cc: "Darrick J. Wong" <djwong@us.ibm.com> Cc: Bob Pearson <rpearson@systemfabricworks.com> Cc: Richard Weinberger <richard@nod.at> Cc: Herbert Xu <herbert@gondor.hengli.com.au> Cc: Yann Collet <yann.collet.73@gmail.com> Cc: Kyungsik Lee <kyungsik.lee@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
106 lines
2.5 KiB
C
106 lines
2.5 KiB
C
/*
|
|
* Cryptographic API.
|
|
*
|
|
* Copyright (c) 2013 Chanho Min <chanho.min@lge.com>
|
|
*
|
|
* 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/lz4.h>
|
|
|
|
struct lz4hc_ctx {
|
|
void *lz4hc_comp_mem;
|
|
};
|
|
|
|
static int lz4hc_init(struct crypto_tfm *tfm)
|
|
{
|
|
struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
|
|
ctx->lz4hc_comp_mem = vmalloc(LZ4HC_MEM_COMPRESS);
|
|
if (!ctx->lz4hc_comp_mem)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void lz4hc_exit(struct crypto_tfm *tfm)
|
|
{
|
|
struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
|
|
vfree(ctx->lz4hc_comp_mem);
|
|
}
|
|
|
|
static int lz4hc_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
|
|
unsigned int slen, u8 *dst, unsigned int *dlen)
|
|
{
|
|
struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
size_t tmp_len = *dlen;
|
|
int err;
|
|
|
|
err = lz4hc_compress(src, slen, dst, &tmp_len, ctx->lz4hc_comp_mem);
|
|
|
|
if (err < 0)
|
|
return -EINVAL;
|
|
|
|
*dlen = tmp_len;
|
|
return 0;
|
|
}
|
|
|
|
static int lz4hc_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
|
|
unsigned int slen, u8 *dst, unsigned int *dlen)
|
|
{
|
|
int err;
|
|
size_t tmp_len = *dlen;
|
|
size_t __slen = slen;
|
|
|
|
err = lz4_decompress(src, &__slen, dst, tmp_len);
|
|
if (err < 0)
|
|
return -EINVAL;
|
|
|
|
*dlen = tmp_len;
|
|
return err;
|
|
}
|
|
|
|
static struct crypto_alg alg_lz4hc = {
|
|
.cra_name = "lz4hc",
|
|
.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
|
|
.cra_ctxsize = sizeof(struct lz4hc_ctx),
|
|
.cra_module = THIS_MODULE,
|
|
.cra_list = LIST_HEAD_INIT(alg_lz4hc.cra_list),
|
|
.cra_init = lz4hc_init,
|
|
.cra_exit = lz4hc_exit,
|
|
.cra_u = { .compress = {
|
|
.coa_compress = lz4hc_compress_crypto,
|
|
.coa_decompress = lz4hc_decompress_crypto } }
|
|
};
|
|
|
|
static int __init lz4hc_mod_init(void)
|
|
{
|
|
return crypto_register_alg(&alg_lz4hc);
|
|
}
|
|
|
|
static void __exit lz4hc_mod_fini(void)
|
|
{
|
|
crypto_unregister_alg(&alg_lz4hc);
|
|
}
|
|
|
|
module_init(lz4hc_mod_init);
|
|
module_exit(lz4hc_mod_fini);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("LZ4HC Compression Algorithm");
|