// SPDX-License-Identifier: GPL-2.0-or-later/* * Cryptographic API for the 842 software compression algorithm. * * Copyright (C) IBM Corporation, 2011-2015 * * Original Authors: Robert Jennings <rcj@linux.vnet.ibm.com> *                   Seth Jennings <sjenning@linux.vnet.ibm.com> * * Rewrite: Dan Streetman <ddstreet@ieee.org> * * This is the software implementation of compression and decompression using * the 842 format.  This uses the software 842 library at lib/842/ which is * only a reference implementation, and is very, very slow as compared to other * software compressors.  You probably do not want to use this software * compression.  If you have access to the PowerPC 842 compression hardware, you * want to use the 842 hardware compression interface, which is at: * drivers/crypto/nx/nx-842-crypto.c */ #include <crypto/internal/scompress.h>#include <linux/init.h>#include <linux/module.h>#include <linux/sw842.h> static void *crypto842_alloc_ctx(void){	void *ctx; 	ctx = kmalloc(SW842_MEM_COMPRESS, GFP_KERNEL);	if (!ctx)		return ERR_PTR(-ENOMEM); 	return ctx;} static void crypto842_free_ctx(void *ctx){	kfree(ctx);} static int crypto842_scompress(struct crypto_scomp *tfm,			       const u8 *src, unsigned int slen,			       u8 *dst, unsigned int *dlen, void *ctx){	return sw842_compress(src, slen, dst, dlen, ctx);} static int crypto842_sdecompress(struct crypto_scomp *tfm,				 const u8 *src, unsigned int slen,				 u8 *dst, unsigned int *dlen, void *ctx){	return sw842_decompress(src, slen, dst, dlen);} static struct scomp_alg scomp = {	.streams		= {		.alloc_ctx	= crypto842_alloc_ctx,		.free_ctx	= crypto842_free_ctx,	},	.compress		= crypto842_scompress,	.decompress		= crypto842_sdecompress,	.base			= {		.cra_name	= "842",		.cra_driver_name = "842-scomp",		.cra_priority	 = 100,		.cra_module	 = THIS_MODULE,	}}; static int __init crypto842_mod_init(void){	return crypto_register_scomp(&scomp);}module_init(crypto842_mod_init); static void __exit crypto842_mod_exit(void){	crypto_unregister_scomp(&scomp);}module_exit(crypto842_mod_exit); MODULE_LICENSE("GPL");MODULE_DESCRIPTION("842 Software Compression Algorithm");MODULE_ALIAS_CRYPTO("842");MODULE_ALIAS_CRYPTO("842-generic");MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.org>");