[ViewVC] Diff of: cvs/liblzf/lzfP.h

Comparing liblzf/lzfP.h (file contents):
Revision 1.10 by root, Thu Mar 3 17:06:44 2005 UTC vs.
Revision 1.20 by root, Thu Feb 4 21:31:17 2010 UTC

 /*
- * Copyright (c) 2000-2005 Marc Alexander Lehmann <schmorp@schmorp.de>
+ * Copyright (c) 2000-2007 Marc Alexander Lehmann <schmorp@schmorp.de>
  *
  * 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-
  * 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
+ * the GNU General Public License ("GPL") version 2 or any later version,
- * provisions of the GPL are applicable instead of the above. If you wish to
+ * in which case the provisions of the GPL are applicable instead of
- * allow the use of your version of this file only under the terms of the
+ * the above. If you wish to allow the use of your version of this file
- * GPL and not to allow others to use your version of this file under the
+ * only under the terms of the GPL and not to allow others to use your
- * BSD license, indicate your decision by deleting the provisions above and
+ * version of this file under the BSD license, indicate your decision
- * replace them with the notice and other provisions required by the GPL. If
+ * by deleting the provisions above and replace them with the notice
- * you do not delete the provisions above, a recipient may use your version
+ * 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
- * of this file under either the BSD or the GPL.
+ * either the BSD or the GPL.
  */
 #ifndef LZFP_h
 #define LZFP_h
-#define STANDALONE /* at the moment, this is ok. */
+#define STANDALONE 1 /* at the moment, this is ok. */
 #ifndef STANDALONE
 # include "lzf.h"
 #endif
 /*
- * size of hashtable is (1 << HLOG) * sizeof (char *)
+ * 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 small blocks (and 14 is usually a bit faster).
- * For a low-memory configuration, use HLOG == 13;
+ * For a low-memory/faster configuration, use HLOG == 13;
- * For best compression, use 15 or 16.
+ * For best compression, use 15 or 16 (or more, up to 23).
  */
 #ifndef HLOG
-# define HLOG 14
+# define HLOG 16
 #endif
 /*
- * sacrifice some compression quality in favour of compression speed.
+ * Sacrifice very little compression quality in favour of compression speed.
- * (roughly 1-2% worse compression for large blocks and
+ * This gives almost the same compression as the default code, and is
- * 9-10% for small, redundant, blocks and >>20% better speed in both cases)
+ * (very roughly) 15% faster. This is the preferred mode of operation.
- * In short: enable this for binary data, disable this for text data.
  */
-#ifndef ULTRA_FAST
+#ifndef VERY_FAST
-# define ULTRA_FAST 1
+# define VERY_FAST 1
 #endif
 /*
- * unconditionally aligning does not cost very much, so do it if unsure
+ * Sacrifice some more 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: when in need for speed, enable this for binary data,
+ * possibly disable this for text data.
  */
-#ifndef STRICT_ALIGN
+#ifndef ULTRA_FAST
-# define STRICT_ALIGN !defined(__i386)
+# define ULTRA_FAST 0
 #endif
 /*
- * use string functions to copy memory.
+ * Unconditionally aligning does not cost very much, so do it if unsure
- * this is usually a loss, even with glibc's optimized memcpy
  */
-#ifndef USE_MEMCPY
+#ifndef STRICT_ALIGN
-# define USE_MEMCPY 0
+# define STRICT_ALIGN !(defined(__i386) || defined (__amd64))
 #endif
 /*
- * you may choose to pre-set the hash table (might be faster on modern cpus
+ * You may choose to pre-set the hash table (might be faster on some
- * and large (>>64k) blocks)
+ * modern cpus and large (>>64k) blocks, and also makes compression
+ * deterministic/repeatable when the configuration otherwise is the same).
  */
 #ifndef INIT_HTAB
 # define INIT_HTAB 0
 #endif
 /*
- * avoid assigning values to errno variable? for some embedding purposes
+ * Avoid assigning values to errno variable? for some embedding purposes
- * (linux kernel for example), this is neccessary. NOTE: this breaks
+ * (linux kernel for example), this is necessary. NOTE: this breaks
  * the documentation in lzf.h.
  */
 #ifndef AVOID_ERRNO
 # define AVOID_ERRNO 0
 #endif
 /*
- * Wether to pass the LZF_STATE variable as argument, or allocate it
+ * Whether to pass the LZF_STATE variable as argument, or allocate it
  * on the stack. For small-stack environments, define this to 1.
  * NOTE: this breaks the prototype in lzf.h.
  */
 #ifndef LZF_STATE_ARG
 # define LZF_STATE_ARG 0
+#endif
+/*
+ * Whether to add extra checks for input validity in lzf_decompress
+ * and return EINVAL if the input stream has been corrupted. This
+ * only shields against overflowing the input buffer and will not
+ * detect most corrupted streams.
+ * This check is not normally noticeable on modern hardware
+ * (<1% slowdown), but might slow down older cpus considerably.
+ */
+#ifndef CHECK_INPUT
+# define CHECK_INPUT 1
 #endif
 /*****************************************************************************/
 /* nothing should be changed below */
 #  undef STRICT_ALIGN
 #  define STRICT_ALIGN 1
 # endif
 #endif
-#if USE_MEMCPY || INIT_HTAB
+#if ULTRA_FAST
+# if defined(VERY_FAST)
+#  undef VERY_FAST
+# endif
+#endif
+#if INIT_HTAB
 # ifdef __cplusplus
 #  include <cstring>
 # else
 #  include <string.h>
 # endif

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Comparing liblzf/lzfP.h (file contents): Revision 1.10 by root, Thu Mar 3 17:06:44 2005 UTC vs. Revision 1.20 by root, Thu Feb 4 21:31:17 2010 UTC

Diff Legend

Comparing liblzf/lzfP.h (file contents):
Revision 1.10 by root, Thu Mar 3 17:06:44 2005 UTC vs.
Revision 1.20 by root, Thu Feb 4 21:31:17 2010 UTC