cregit-Linux how code gets into the kernel

Release 4.11 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>
#include <crypto/internal/scompress.h>


struct crypto842_ctx {
	
void *wmem;	/* working memory for compress */
};


static void *crypto842_alloc_ctx(struct crypto_scomp *tfm) { void *ctx; ctx = kmalloc(SW842_MEM_COMPRESS, GFP_KERNEL); if (!ctx) return ERR_PTR(-ENOMEM); return ctx; }

Contributors

PersonTokensPropCommitsCommitProp
Giovanni Cabiddu40100.00%1100.00%
Total40100.00%1100.00%


static int crypto842_init(struct crypto_tfm *tfm) { struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm); ctx->wmem = crypto842_alloc_ctx(NULL); if (IS_ERR(ctx->wmem)) return -ENOMEM; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Giovanni Cabiddu46100.00%1100.00%
Total46100.00%1100.00%


static void crypto842_free_ctx(struct crypto_scomp *tfm, void *ctx) { kfree(ctx); }

Contributors

PersonTokensPropCommitsCommitProp
Giovanni Cabiddu20100.00%1100.00%
Total20100.00%1100.00%


static void crypto842_exit(struct crypto_tfm *tfm) { struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm); crypto842_free_ctx(NULL, ctx->wmem); }

Contributors

PersonTokensPropCommitsCommitProp
Giovanni Cabiddu30100.00%1100.00%
Total30100.00%1100.00%


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 Jennings5090.91%150.00%
Dan Streetman59.09%150.00%
Total55100.00%2100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Giovanni Cabiddu47100.00%1100.00%
Total47100.00%1100.00%


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 Jennings3995.12%150.00%
Dan Streetman24.88%150.00%
Total41100.00%2100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Giovanni Cabiddu45100.00%1100.00%
Total45100.00%1100.00%

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_init = crypto842_init, .cra_exit = crypto842_exit, .cra_u = { .compress = { .coa_compress = crypto842_compress, .coa_decompress = crypto842_decompress } } }; static struct scomp_alg scomp = { .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) { 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; }

Contributors

PersonTokensPropCommitsCommitProp
Giovanni Cabiddu3871.70%133.33%
Seth Jennings1426.42%133.33%
Dan Streetman11.89%133.33%
Total53100.00%3100.00%

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

Contributors

PersonTokensPropCommitsCommitProp
Seth Jennings1466.67%133.33%
Giovanni Cabiddu628.57%133.33%
Dan Streetman14.76%133.33%
Total21100.00%3100.00%

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
Giovanni Cabiddu33958.25%125.00%
Seth Jennings19433.33%125.00%
Dan Streetman447.56%125.00%
Kees Cook50.86%125.00%
Total582100.00%4100.00%
Directory: crypto
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.