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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788// 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>");