diff options
Diffstat (limited to 'crypto/lzo-rle.c')
| -rw-r--r-- | crypto/lzo-rle.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/crypto/lzo-rle.c b/crypto/lzo-rle.c new file mode 100644 index 000000000000..ea9c75b1db49 --- /dev/null +++ b/crypto/lzo-rle.c @@ -0,0 +1,175 @@ +/* + * 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 lzorle_ctx { + void *lzorle_comp_mem; +}; + +static void *lzorle_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 lzorle_init(struct crypto_tfm *tfm) +{ + struct lzorle_ctx *ctx = crypto_tfm_ctx(tfm); + + ctx->lzorle_comp_mem = lzorle_alloc_ctx(NULL); + if (IS_ERR(ctx->lzorle_comp_mem)) + return -ENOMEM; + + return 0; +} + +static void lzorle_free_ctx(struct crypto_scomp *tfm, void *ctx) +{ + kvfree(ctx); +} + +static void lzorle_exit(struct crypto_tfm *tfm) +{ + struct lzorle_ctx *ctx = crypto_tfm_ctx(tfm); + + lzorle_free_ctx(NULL, ctx->lzorle_comp_mem); +} + +static int __lzorle_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 = lzorle1x_1_compress(src, slen, dst, &tmp_len, ctx); + + if (err != LZO_E_OK) + return -EINVAL; + + *dlen = tmp_len; + return 0; +} + +static int lzorle_compress(struct crypto_tfm *tfm, const u8 *src, + unsigned int slen, u8 *dst, unsigned int *dlen) +{ + struct lzorle_ctx *ctx = crypto_tfm_ctx(tfm); + + return __lzorle_compress(src, slen, dst, dlen, ctx->lzorle_comp_mem); +} + +static int lzorle_scompress(struct crypto_scomp *tfm, const u8 *src, + unsigned int slen, u8 *dst, unsigned int *dlen, + void *ctx) +{ + return __lzorle_compress(src, slen, dst, dlen, ctx); +} + +static int __lzorle_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 lzorle_decompress(struct crypto_tfm *tfm, const u8 *src, + unsigned int slen, u8 *dst, unsigned int *dlen) +{ + return __lzorle_decompress(src, slen, dst, dlen); +} + +static int lzorle_sdecompress(struct crypto_scomp *tfm, const u8 *src, + unsigned int slen, u8 *dst, unsigned int *dlen, + void *ctx) +{ + return __lzorle_decompress(src, slen, dst, dlen); +} + +static struct crypto_alg alg = { + .cra_name = "lzo-rle", + .cra_flags = CRYPTO_ALG_TYPE_COMPRESS, + .cra_ctxsize = sizeof(struct lzorle_ctx), + .cra_module = THIS_MODULE, + .cra_init = lzorle_init, + .cra_exit = lzorle_exit, + .cra_u = { .compress = { + .coa_compress = lzorle_compress, + .coa_decompress = lzorle_decompress } } +}; + +static struct scomp_alg scomp = { + .alloc_ctx = lzorle_alloc_ctx, + .free_ctx = lzorle_free_ctx, + .compress = lzorle_scompress, + .decompress = lzorle_sdecompress, + .base = { + .cra_name = "lzo-rle", + .cra_driver_name = "lzo-rle-scomp", + .cra_module = THIS_MODULE, + } +}; + +static int __init lzorle_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 lzorle_mod_fini(void) +{ + crypto_unregister_alg(&alg); + crypto_unregister_scomp(&scomp); +} + +module_init(lzorle_mod_init); +module_exit(lzorle_mod_fini); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("LZO-RLE Compression Algorithm"); +MODULE_ALIAS_CRYPTO("lzo-rle"); |