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131 lines
3.1 KiB
131 lines
3.1 KiB
/* |
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* Cryptographic API. |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 as published by |
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* the Free Software Foundation. |
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* |
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* This program is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
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* more details. |
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* |
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*/ |
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/crypto.h> |
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#include <linux/vmalloc.h> |
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#include <linux/lzo.h> |
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#include <linux/lz4k.h> |
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#define malloc(a) kmalloc(a, GFP_KERNEL) |
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#define free(a) kfree(a) |
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struct lz4k_ctx { |
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void *lz4k_comp_mem; |
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}; |
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static int lz4kc_init(struct crypto_tfm *tfm) |
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{ |
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struct lz4k_ctx *ctx = crypto_tfm_ctx(tfm); |
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ctx->lz4k_comp_mem = vmalloc(LZO1X_MEM_COMPRESS); |
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if (!ctx->lz4k_comp_mem) |
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return -ENOMEM; |
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return 0; |
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} |
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static void lz4kc_exit(struct crypto_tfm *tfm) |
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{ |
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struct lz4k_ctx *ctx = crypto_tfm_ctx(tfm); |
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vfree(ctx->lz4k_comp_mem); |
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} |
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static int lz4kc_compress(struct crypto_tfm *tfm, const u8 *src, |
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unsigned int slen, u8 *dst, unsigned int *dlen) |
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{ |
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struct lz4k_ctx *ctx = crypto_tfm_ctx(tfm); |
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/* static size_t in_size = 0, out_size = 0; */ |
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size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */ |
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int err; |
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static int count; /*= 0*/ |
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/* printk("lz4k_compress 2 count = %d\r\n", count); */ |
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count++; |
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err = lz4k_compress(src, slen, dst, &tmp_len, ctx->lz4k_comp_mem); |
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/* err = lzo1x_1_compress(src, slen, dst, &tmp_len, ctx->lz4k_comp_mem); */ |
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if (err != LZO_E_OK) |
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return -EINVAL; |
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#if 0 |
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if (count%10 == 0) { |
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in_size += slen; |
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out_size += tmp_len; |
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/* printk("lz4k_compress_ubifs result in_size = %d, out_size = %d\n", in_size, out_size); */ |
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} |
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#endif |
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/* printk("lz4k_compress result in_size = %d, out_size = %d\n", in_size, out_size); */ |
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/* printk("lz4k_compress result slen = %d, tmp_len = %d\n", slen, tmp_len); */ |
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*dlen = tmp_len; |
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return 0; |
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} |
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static int lz4kc_decompress(struct crypto_tfm *tfm, const u8 *src, |
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unsigned int slen, u8 *dst, unsigned int *dlen) |
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{ |
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static int count; /* = 0 */ |
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int err; |
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size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */ |
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/* printk("lz4k_decompress 2count = %d, *dlen = %d", count, *dlen); */ |
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err = lz4k_decompress_ubifs(src, slen, dst, &tmp_len); |
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/* err = lzo1x_decompress_safe(src, slen, dst, &tmp_len); */ |
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count++; |
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if (err != LZO_E_OK) |
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return -EINVAL; |
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*dlen = tmp_len; |
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return 0; |
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} |
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static struct crypto_alg alg = { |
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.cra_name = "lz4k", |
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.cra_flags = CRYPTO_ALG_TYPE_COMPRESS, |
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.cra_ctxsize = sizeof(struct lz4k_ctx), |
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.cra_module = THIS_MODULE, |
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.cra_list = LIST_HEAD_INIT(alg.cra_list), |
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.cra_init = lz4kc_init, |
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.cra_exit = lz4kc_exit, |
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.cra_u = { .compress = { |
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.coa_compress = lz4kc_compress, |
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.coa_decompress = lz4kc_decompress } |
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} |
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}; |
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static int __init lz4k_mod_init(void) |
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{ |
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return crypto_register_alg(&alg); |
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} |
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static void __exit lz4k_mod_fini(void) |
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{ |
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crypto_unregister_alg(&alg); |
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} |
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module_init(lz4k_mod_init); |
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module_exit(lz4k_mod_fini); |
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MODULE_LICENSE("GPL"); |
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MODULE_DESCRIPTION("LZ77 with 4K Compression Algorithm");
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