linux-imx

/*

 * 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);

}