cd15f1020f
Decompress function in LZ4 library is supposed to return an error code or negative result. But, it returns -1 when any error is detected. Return error code when the library returns negative value. Signed-off-by: Myungho Jung <mhjungk@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
174 lines
4 KiB
C
174 lines
4 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>
|
|
#include <crypto/internal/scompress.h>
|
|
|
|
struct lz4hc_ctx {
|
|
void *lz4hc_comp_mem;
|
|
};
|
|
|
|
static void *lz4hc_alloc_ctx(struct crypto_scomp *tfm)
|
|
{
|
|
void *ctx;
|
|
|
|
ctx = vmalloc(LZ4HC_MEM_COMPRESS);
|
|
if (!ctx)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
return ctx;
|
|
}
|
|
|
|
static int lz4hc_init(struct crypto_tfm *tfm)
|
|
{
|
|
struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
|
|
ctx->lz4hc_comp_mem = lz4hc_alloc_ctx(NULL);
|
|
if (IS_ERR(ctx->lz4hc_comp_mem))
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void lz4hc_free_ctx(struct crypto_scomp *tfm, void *ctx)
|
|
{
|
|
vfree(ctx);
|
|
}
|
|
|
|
static void lz4hc_exit(struct crypto_tfm *tfm)
|
|
{
|
|
struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
|
|
lz4hc_free_ctx(NULL, ctx->lz4hc_comp_mem);
|
|
}
|
|
|
|
static int __lz4hc_compress_crypto(const u8 *src, unsigned int slen,
|
|
u8 *dst, unsigned int *dlen, void *ctx)
|
|
{
|
|
int out_len = LZ4_compress_HC(src, dst, slen,
|
|
*dlen, LZ4HC_DEFAULT_CLEVEL, ctx);
|
|
|
|
if (!out_len)
|
|
return -EINVAL;
|
|
|
|
*dlen = out_len;
|
|
return 0;
|
|
}
|
|
|
|
static int lz4hc_scompress(struct crypto_scomp *tfm, const u8 *src,
|
|
unsigned int slen, u8 *dst, unsigned int *dlen,
|
|
void *ctx)
|
|
{
|
|
return __lz4hc_compress_crypto(src, slen, dst, dlen, ctx);
|
|
}
|
|
|
|
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);
|
|
|
|
return __lz4hc_compress_crypto(src, slen, dst, dlen,
|
|
ctx->lz4hc_comp_mem);
|
|
}
|
|
|
|
static int __lz4hc_decompress_crypto(const u8 *src, unsigned int slen,
|
|
u8 *dst, unsigned int *dlen, void *ctx)
|
|
{
|
|
int out_len = LZ4_decompress_safe(src, dst, slen, *dlen);
|
|
|
|
if (out_len < 0)
|
|
return -EINVAL;
|
|
|
|
*dlen = out_len;
|
|
return 0;
|
|
}
|
|
|
|
static int lz4hc_sdecompress(struct crypto_scomp *tfm, const u8 *src,
|
|
unsigned int slen, u8 *dst, unsigned int *dlen,
|
|
void *ctx)
|
|
{
|
|
return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
|
|
}
|
|
|
|
static int lz4hc_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
|
|
unsigned int slen, u8 *dst,
|
|
unsigned int *dlen)
|
|
{
|
|
return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
|
|
}
|
|
|
|
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 struct scomp_alg scomp = {
|
|
.alloc_ctx = lz4hc_alloc_ctx,
|
|
.free_ctx = lz4hc_free_ctx,
|
|
.compress = lz4hc_scompress,
|
|
.decompress = lz4hc_sdecompress,
|
|
.base = {
|
|
.cra_name = "lz4hc",
|
|
.cra_driver_name = "lz4hc-scomp",
|
|
.cra_module = THIS_MODULE,
|
|
}
|
|
};
|
|
|
|
static int __init lz4hc_mod_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = crypto_register_alg(&alg_lz4hc);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = crypto_register_scomp(&scomp);
|
|
if (ret) {
|
|
crypto_unregister_alg(&alg_lz4hc);
|
|
return ret;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __exit lz4hc_mod_fini(void)
|
|
{
|
|
crypto_unregister_alg(&alg_lz4hc);
|
|
crypto_unregister_scomp(&scomp);
|
|
}
|
|
|
|
module_init(lz4hc_mod_init);
|
|
module_exit(lz4hc_mod_fini);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("LZ4HC Compression Algorithm");
|
|
MODULE_ALIAS_CRYPTO("lz4hc");
|