cregit-Linux how code gets into the kernel

Release 4.7 crypto/842.c

Directory: crypto
/*
 * Cryptographic API for the 842 software compression algorithm.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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.
 *
 * 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 <linux/init.h>
#include <linux/module.h>
#include <linux/crypto.h>
#include <linux/sw842.h>


struct crypto842_ctx {
	
char wmem[SW842_MEM_COMPRESS];	/* working memory for compress */
};


static int crypto842_compress(struct crypto_tfm *tfm, const u8 *src, unsigned int slen, u8 *dst, unsigned int *dlen) { struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm); return sw842_compress(src, slen, dst, dlen, ctx->wmem); }

Contributors

PersonTokensPropCommitsCommitProp
seth jenningsseth jennings5090.91%150.00%
dan streetmandan streetman59.09%150.00%
Total55100.00%2100.00%


static int crypto842_decompress(struct crypto_tfm *tfm, const u8 *src, unsigned int slen, u8 *dst, unsigned int *dlen) { return sw842_decompress(src, slen, dst, dlen); }

Contributors

PersonTokensPropCommitsCommitProp
seth jenningsseth jennings3995.12%150.00%
dan streetmandan streetman24.88%150.00%
Total41100.00%2100.00%

static struct crypto_alg alg = { .cra_name = "842", .cra_driver_name = "842-generic", .cra_priority = 100, .cra_flags = CRYPTO_ALG_TYPE_COMPRESS, .cra_ctxsize = sizeof(struct crypto842_ctx), .cra_module = THIS_MODULE, .cra_u = { .compress = { .coa_compress = crypto842_compress, .coa_decompress = crypto842_decompress } } };
static int __init crypto842_mod_init(void) { return crypto_register_alg(&alg); }

Contributors

PersonTokensPropCommitsCommitProp
seth jenningsseth jennings1593.75%150.00%
dan streetmandan streetman16.25%150.00%
Total16100.00%2100.00%

module_init(crypto842_mod_init);
static void __exit crypto842_mod_exit(void) { crypto_unregister_alg(&alg); }

Contributors

PersonTokensPropCommitsCommitProp
seth jenningsseth jennings1493.33%150.00%
dan streetmandan streetman16.67%150.00%
Total15100.00%2100.00%

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>");

Overall Contributors

PersonTokensPropCommitsCommitProp
seth jenningsseth jennings19578.63%133.33%
dan streetmandan streetman4819.35%133.33%
kees cookkees cook52.02%133.33%
Total248100.00%3100.00%
Directory: crypto
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