[PATCH] [48/48] Suspend2 2.1.9.8 for 2.6.12: 624-filewriter.patch

[Nigel Cunningham <nigel@suspend2.net>]

diff -ruNp 625-crypto-api-work.patch-old/crypto/Kconfig 625-crypto-api-work.patch-new/crypto/Kconfig
--- 625-crypto-api-work.patch-old/crypto/Kconfig	2005-06-20 11:46:49.000000000 +1000
+++ 625-crypto-api-work.patch-new/crypto/Kconfig	2005-07-04 23:14:19.000000000 +1000
@@ -262,6 +262,13 @@ config CRYPTO_DEFLATE
 	  
 	  You will most probably want this if using IPSec.
 
+config CRYPTO_LZF
+	tristate "LZF compression algorithm"
+	depends on CRYPTO
+	help
+	  This is the LZF algorithm. It is especially useful for Suspend2,
+	  because it achieves good compression quickly.
+
 config CRYPTO_MICHAEL_MIC
 	tristate "Michael MIC keyed digest algorithm"
 	depends on CRYPTO
diff -ruNp 625-crypto-api-work.patch-old/crypto/lzf.c 625-crypto-api-work.patch-new/crypto/lzf.c
--- 625-crypto-api-work.patch-old/crypto/lzf.c	1970-01-01 10:00:00.000000000 +1000
+++ 625-crypto-api-work.patch-new/crypto/lzf.c	2005-07-05 23:57:15.000000000 +1000
@@ -0,0 +1,442 @@
+/* 
+ * Cryptoapi LZF compression module.
+ *
+ * Copyright (c) 2004-2005 Nigel Cunningham <nigel@suspend2.net>
+ *
+ * based on the deflate.c file:
+ * 
+ * Copyright (c) 2003 James Morris <jmorris@intercode.com.au>
+ * 
+ * and upon the LZF compression module donated to the Suspend2 project with
+ * the following copyright:
+ *
+ * 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.
+ * Copyright (c) 2000-2003 Marc Alexander Lehmann <pcg@goof.com>
+ * 
+ * Redistribution and use in source and binary forms, with or without modifica-
+ * tion, are permitted provided that the following conditions are met:
+ * 
+ *   1.  Redistributions of source code must retain the above copyright notice,
+ *       this list of conditions and the following disclaimer.
+ * 
+ *   2.  Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ * 
+ *   3.  The name of the author may not be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
+ * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
+ * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
+ * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * the GNU General Public License version 2 (the "GPL"), in which case the
+ * provisions of the GPL are applicable instead of the above. If you wish to
+ * allow the use of your version of this file only under the terms of the
+ * GPL and not to allow others to use your version of this file under the
+ * BSD license, indicate your decision by deleting the provisions above and
+ * replace them with the notice and other provisions required by the GPL. If
+ * you do not delete the provisions above, a recipient may use your version
+ * of this file under either the BSD or the GPL.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/crypto.h>
+#include <linux/err.h>
+#include <linux/vmalloc.h>
+#include <asm/string.h>
+
+struct lzf_ctx {
+	void * hbuf;
+	char * local_buffer;
+	char * page_buffer;
+	unsigned int bufofs;
+	int first_call;
+};
+
+/*
+ * size of hashtable is (1 << HLOG) * sizeof (char *)
+ * decompression is independent of the hash table size
+ * the difference between 15 and 14 is very small
+ * for small blocks (and 14 is also faster).
+ * For a low-memory configuration, use HLOG == 13;
+ * For best compression, use 15 or 16.
+ */
+#define HLOG 14
+
+/*
+ * sacrifice some compression quality in favour of compression speed.
+ * (roughly 1-2% worse compression for large blocks and
+ * 9-10% for small, redundant, blocks and >>20% better speed in both cases)
+ * In short: enable this for binary data, disable this for text data.
+ */
+#define ULTRA_FAST 1
+
+#define STRICT_ALIGN 0
+#define USE_MEMCPY 1
+#define INIT_HTAB 0
+
+#define HSIZE (1 << (HLOG))
+
+/*
+ * don't play with this unless you benchmark!
+ * decompression is not dependent on the hash function
+ * the hashing function might seem strange, just believe me
+ * it works ;)
+ */
+#define FRST(p) (((p[0]) << 8) + p[1])
+#define NEXT(v,p) (((v) << 8) + p[2])
+#define IDX(h) ((((h ^ (h << 5)) >> (3*8 - HLOG)) + h*3) & (HSIZE - 1))
+/*
+ * IDX works because it is very similar to a multiplicative hash, e.g.
+ * (h * 57321 >> (3*8 - HLOG))
+ * the next one is also quite good, albeit slow ;)
+ * (int)(cos(h & 0xffffff) * 1e6)
+ */
+
+#if 0
+/* original lzv-like hash function */
+# define FRST(p) (p[0] << 5) ^ p[1]
+# define NEXT(v,p) ((v) << 5) ^ p[2]
+# define IDX(h) ((h) & (HSIZE - 1))
+#endif
+
+#define        MAX_LIT        (1 <<  5)
+#define        MAX_OFF        (1 << 13)
+#define        MAX_REF        ((1 <<  8) + (1 << 3))
+
+/*
+ * compressed format
+ *
+ * 000LLLLL <L+1>    ; literal
+ * LLLOOOOO oooooooo ; backref L
+ * 111OOOOO LLLLLLLL oooooooo ; backref L+7
+ *
+ */
+
+static void lzf_compress_exit(void * context)
+{
+	struct lzf_ctx * ctx = (struct lzf_ctx *) context;
+
+	if (ctx->local_buffer) {
+		free_pages((unsigned long) ctx->local_buffer, 0);
+		ctx->local_buffer = NULL;
+	}
+
+	if (ctx->page_buffer) {
+		free_pages((unsigned long) ctx->page_buffer, 0);
+		ctx->page_buffer = NULL;
+	}
+	
+	if (ctx->hbuf) {
+		vfree(ctx->hbuf);
+		ctx->hbuf = NULL;
+	}
+
+	ctx->first_call = 0;
+}
+
+static int lzf_compress_init(void *context)
+{
+	struct lzf_ctx * ctx = (struct lzf_ctx *) context;
+
+	/* Get LZF ready to go */
+	ctx->hbuf = vmalloc_32((1<<HLOG)*sizeof(char *));
+	if (!ctx->hbuf) {
+		printk(KERN_WARNING
+			"Failed to allocate %d bytes for lzf workspace\n",
+			(1<<HLOG)*sizeof(char *));
+		return -ENOMEM;
+	}
+	
+	/* Allocate local buffer */
+	ctx->local_buffer = (char *) get_zeroed_page(GFP_ATOMIC);
+
+	if (!ctx->local_buffer) {
+		lzf_compress_exit(ctx);
+		return -ENOMEM;
+	}
+
+	/* Allocate page buffer */
+	ctx->page_buffer = (char *) get_zeroed_page(GFP_ATOMIC);
+
+	if (!ctx->page_buffer) {
+		free_pages((unsigned long) ctx->local_buffer, 0);
+		lzf_compress_exit(ctx);
+		return -ENOMEM;
+	}
+
+	ctx->first_call = 1;
+
+	return 0;
+}
+
+static int lzf_compress(void * context, const u8 *in_data, unsigned int in_len,
+	                    u8 *out_data, unsigned int *out_len)
+{
+  struct lzf_ctx * ctx = (struct lzf_ctx *) context;
+  const u8 **htab = ctx->hbuf;
+  const u8 **hslot;
+  const u8 *ip = in_data;
+        u8 *op = out_data;
+  const u8 *in_end  = ip + in_len;
+        u8 *out_end = op + *out_len - 3;
+  const u8 *ref;
+
+  unsigned int hval = FRST (ip);
+  unsigned long off;
+           int lit = 0;
+
+	if (ctx->first_call) {
+		ctx->first_call = 0;
+	}
+#if INIT_HTAB
+# if USE_MEMCPY
+    memset (htab, 0, sizeof (htab));
+# else
+    for (hslot = htab; hslot < htab + HSIZE; hslot++)
+      *hslot++ = ip;
+# endif
+#endif
+
+  for (;;)
+    {
+      if (ip < in_end - 2)
+        {
+          hval = NEXT (hval, ip);
+          hslot = htab + IDX (hval);
+          ref = *hslot; *hslot = ip;
+
+          if (1
+#if INIT_HTAB && !USE_MEMCPY
+              && ref < ip /* the next test will actually take care of this, but this is faster */
+#endif
+              && (off = ip - ref - 1) < MAX_OFF
+              && ip + 4 < in_end
+              && ref > in_data
+#if STRICT_ALIGN
+              && ref[0] == ip[0]
+              && ref[1] == ip[1]
+              && ref[2] == ip[2]
+#else
+              && *(u16 *)ref == *(u16 *)ip
+              && ref[2] == ip[2]
+#endif
+            )
+            {
+              /* match found at *ref++ */
+              unsigned int len = 2;
+              unsigned int maxlen = in_end - ip - len;
+              maxlen = maxlen > MAX_REF ? MAX_REF : maxlen;
+
+              do
+                len++;
+              while (len < maxlen && ref[len] == ip[len]);
+
+              if (op + lit + 1 + 3 >= out_end) {
+		*out_len = PAGE_SIZE;
+                return 0;
+	      }
+
+              if (lit)
+                {
+                  *op++ = lit - 1;
+                  lit = -lit;
+                  do
+                    *op++ = ip[lit];
+                  while (++lit);
+                }
+
+              len -= 2;
+              ip++;
+
+              if (len < 7)
+                {
+                  *op++ = (off >> 8) + (len << 5);
+                }
+              else
+                {
+                  *op++ = (off >> 8) + (  7 << 5);
+                  *op++ = len - 7;
+                }
+
+              *op++ = off;
+
+#if ULTRA_FAST
+              ip += len;
+              hval = FRST (ip);
+              hval = NEXT (hval, ip);
+              htab[IDX (hval)] = ip;
+              ip++;
+#else
+              do
+                {
+                  hval = NEXT (hval, ip);
+                  htab[IDX (hval)] = ip;
+                  ip++;
+                }
+              while (len--);
+#endif
+              continue;
+            }
+        }
+      else if (ip == in_end)
+        break;
+
+      /* one more literal byte we must copy */
+      lit++;
+      ip++;
+
+      if (lit == MAX_LIT)
+        {
+          if (op + 1 + MAX_LIT >= out_end) {
+            *out_len = PAGE_SIZE;
+            return 0;
+	  }
+
+          *op++ = MAX_LIT - 1;
+#if USE_MEMCPY
+          memcpy (op, ip - MAX_LIT, MAX_LIT);
+          op += MAX_LIT;
+          lit = 0;
+#else
+          lit = -lit;
+          do
+            *op++ = ip[lit];
+          while (++lit);
+#endif
+        }
+    }
+
+  if (lit)
+    {
+      if (op + lit + 1 >= out_end) {
+        *out_len = PAGE_SIZE;
+	return 0;
+      }
+
+      *op++ = lit - 1;
+      lit = -lit;
+      do
+	*op++ = ip[lit];
+      while (++lit);
+    }
+
+  *out_len = op - out_data;
+  return 0;
+}
+ 
+static int lzf_decompress(void * context, const u8 *src, unsigned int slen,
+                              u8 *dst, unsigned int *dlen)
+{
+	struct lzf_ctx * ctx = (struct lzf_ctx *) context;
+  u8 const *ip = src;
+  u8       *op = dst;
+  u8 const *const in_end  = ip + slen;
+  u8       *const out_end = op + *dlen;
+
+	if (ctx->first_call) {
+		ctx->first_call = 0;
+	}
+  do
+    {
+      unsigned int ctrl = *ip++;
+
+      if (ctrl < (1 << 5)) /* literal run */
+        {
+          ctrl++;
+
+          if (op + ctrl > out_end) {
+            *dlen = PAGE_SIZE;
+            return 0;
+	  }
+
+#if USE_MEMCPY
+          memcpy (op, ip, ctrl);
+          op += ctrl;
+          ip += ctrl;
+#else
+          do
+            *op++ = *ip++;
+          while (--ctrl);
+#endif
+        }
+      else /* back reference */
+        {
+          unsigned int len = ctrl >> 5;
+
+          u8 *ref = op - ((ctrl & 0x1f) << 8) - 1;
+
+          if (len == 7)
+            len += *ip++;
+          
+          ref -= *ip++;
+
+          if (op + len + 2 > out_end) {
+            *dlen = PAGE_SIZE;
+            return 0;
+	  }
+
+          if (ref < (u8 *)dst) {
+            *dlen = PAGE_SIZE;
+            return 0;
+	  }
+
+          *op++ = *ref++;
+          *op++ = *ref++;
+
+          do
+            *op++ = *ref++;
+          while (--len);
+        }
+    }
+  while (op < out_end && ip < in_end);
+
+  *dlen = op - (u8 *)dst;
+  return 0;
+}
+
+static struct crypto_alg alg = {
+	.cra_name		= "lzf",
+	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
+	.cra_ctxsize		= 0,
+	.cra_module		= THIS_MODULE,
+	.cra_list		= LIST_HEAD_INIT(alg.cra_list),
+	.cra_u			= { .compress = {
+	.coa_init		= lzf_compress_init,
+	.coa_exit		= lzf_compress_exit,
+	.coa_compress 		= lzf_compress,
+	.coa_decompress  	= lzf_decompress } }
+};
+
+static int __init init(void)
+{
+	return crypto_register_alg(&alg);
+}
+
+static void __exit fini(void)
+{
+	crypto_unregister_alg(&alg);
+}
+
+module_init(init);
+module_exit(fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("LZF Compression Algorithm");
+MODULE_AUTHOR("Marc Alexander Lehmann & Nigel Cunningham");
+
diff -ruNp 625-crypto-api-work.patch-old/crypto/Makefile 625-crypto-api-work.patch-new/crypto/Makefile
--- 625-crypto-api-work.patch-old/crypto/Makefile	2005-06-20 11:46:49.000000000 +1000
+++ 625-crypto-api-work.patch-new/crypto/Makefile	2005-07-04 23:14:19.000000000 +1000
@@ -30,5 +30,6 @@ obj-$(CONFIG_CRYPTO_ANUBIS) += anubis.o
 obj-$(CONFIG_CRYPTO_DEFLATE) += deflate.o
 obj-$(CONFIG_CRYPTO_MICHAEL_MIC) += michael_mic.o
 obj-$(CONFIG_CRYPTO_CRC32C) += crc32c.o
+obj-$(CONFIG_CRYPTO_LZF) += lzf.o
 
 obj-$(CONFIG_CRYPTO_TEST) += tcrypt.o