lzo-rle.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Cryptographic API.
  4 */
  5
  6#include <crypto/internal/scompress.h>
  7#include <linux/init.h>
  8#include <linux/lzo.h>
  9#include <linux/module.h>
 10#include <linux/slab.h>
 11
 12static void *lzorle_alloc_ctx(void)
 13{
 14	void *ctx;
 15
 16	ctx = kvmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
 17	if (!ctx)
 18		return ERR_PTR(-ENOMEM);
 19
 20	return ctx;
 21}
 22
 23static void lzorle_free_ctx(void *ctx)
 24{
 25	kvfree(ctx);
 26}
 27
 28static int __lzorle_compress(const u8 *src, unsigned int slen,
 29			  u8 *dst, unsigned int *dlen, void *ctx)
 30{
 31	size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
 32	int err;
 33
 34	err = lzorle1x_1_compress_safe(src, slen, dst, &tmp_len, ctx);
 35
 36	if (err != LZO_E_OK)
 37		return -EINVAL;
 38
 39	*dlen = tmp_len;
 40	return 0;
 41}
 42
 43static int lzorle_scompress(struct crypto_scomp *tfm, const u8 *src,
 44			 unsigned int slen, u8 *dst, unsigned int *dlen,
 45			 void *ctx)
 46{
 47	return __lzorle_compress(src, slen, dst, dlen, ctx);
 48}
 49
 50static int __lzorle_decompress(const u8 *src, unsigned int slen,
 51			    u8 *dst, unsigned int *dlen)
 52{
 53	int err;
 54	size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
 55
 56	err = lzo1x_decompress_safe(src, slen, dst, &tmp_len);
 57
 58	if (err != LZO_E_OK)
 59		return -EINVAL;
 60
 61	*dlen = tmp_len;
 62	return 0;
 63}
 64
 65static int lzorle_sdecompress(struct crypto_scomp *tfm, const u8 *src,
 66			   unsigned int slen, u8 *dst, unsigned int *dlen,
 67			   void *ctx)
 68{
 69	return __lzorle_decompress(src, slen, dst, dlen);
 70}
 71
 72static struct scomp_alg scomp = {
 73	.streams		= {
 74		.alloc_ctx	= lzorle_alloc_ctx,
 75		.free_ctx	= lzorle_free_ctx,
 76	},
 77	.compress		= lzorle_scompress,
 78	.decompress		= lzorle_sdecompress,
 79	.base			= {
 80		.cra_name	= "lzo-rle",
 81		.cra_driver_name = "lzo-rle-scomp",
 82		.cra_module	 = THIS_MODULE,
 83	}
 84};
 85
 86static int __init lzorle_mod_init(void)
 87{
 88	return crypto_register_scomp(&scomp);
 89}
 90
 91static void __exit lzorle_mod_fini(void)
 92{
 93	crypto_unregister_scomp(&scomp);
 94}
 95
 96module_init(lzorle_mod_init);
 97module_exit(lzorle_mod_fini);
 98
 99MODULE_LICENSE("GPL");
100MODULE_DESCRIPTION("LZO-RLE Compression Algorithm");
101MODULE_ALIAS_CRYPTO("lzo-rle");