Initial check-in of (stripped-down) UCL data compression library v 1.01

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8087 a1c6a512-1295-4272-9138-f99709370657

tools/ucl/src/ucl_util.h

@@ -0,0 +1,180 @@
+/* ucl_util.h -- utilities for the UCL library
+
+   This file is part of the UCL data compression library.
+
+   Copyright (C) 1996-2002 Markus Franz Xaver Johannes Oberhumer
+   All Rights Reserved.
+
+   The UCL library 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.
+
+   The UCL library 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.
+
+   You should have received a copy of the GNU General Public License
+   along with the UCL library; see the file COPYING.
+   If not, write to the Free Software Foundation, Inc.,
+   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+   Markus F.X.J. Oberhumer
+   <markus@oberhumer.com>
+ */
+
+
+/* WARNING: this file should *not* be used by applications. It is
+   part of the implementation of the library and is subject
+   to change.
+ */
+
+
+#ifndef __UCL_UTIL_H
+#define __UCL_UTIL_H
+
+#ifndef __UCL_CONF_H
+#  include "ucl_conf.h"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/***********************************************************************
+// fast memcpy that copies multiples of 8 byte chunks.
+// len is the number of bytes.
+// note: all parameters must be lvalues, len >= 8
+//       dest and src advance, len is undefined afterwards
+************************************************************************/
+
+#if 1 && defined(HAVE_MEMCPY)
+#if !defined(__UCL_DOS16) && !defined(__UCL_WIN16)
+
+#define MEMCPY8_DS(dest,src,len) \
+    memcpy(dest,src,len); \
+    dest += len; \
+    src += len
+
+#endif
+#endif
+
+
+#if 0 && !defined(MEMCPY8_DS)
+
+#define MEMCPY8_DS(dest,src,len) \
+    { do { \
+        *dest++ = *src++; \
+        *dest++ = *src++; \
+        *dest++ = *src++; \
+        *dest++ = *src++; \
+        *dest++ = *src++; \
+        *dest++ = *src++; \
+        *dest++ = *src++; \
+        *dest++ = *src++; \
+        len -= 8; \
+    } while (len > 0); }
+
+#endif
+
+
+#if !defined(MEMCPY8_DS)
+
+#define MEMCPY8_DS(dest,src,len) \
+    { register ucl_uint __l = (len) / 8; \
+    do { \
+        *dest++ = *src++; \
+        *dest++ = *src++; \
+        *dest++ = *src++; \
+        *dest++ = *src++; \
+        *dest++ = *src++; \
+        *dest++ = *src++; \
+        *dest++ = *src++; \
+        *dest++ = *src++; \
+    } while (--__l > 0); }
+
+#endif
+
+
+/***********************************************************************
+// memcpy and pseudo-memmove
+// len is the number of bytes.
+// note: all parameters must be lvalues, len > 0
+//       dest and src advance, len is undefined afterwards
+************************************************************************/
+
+#define MEMCPY_DS(dest,src,len) \
+    do *dest++ = *src++; \
+    while (--len > 0)
+
+#define MEMMOVE_DS(dest,src,len) \
+    do *dest++ = *src++; \
+    while (--len > 0)
+
+
+/***********************************************************************
+// fast bzero that clears multiples of 8 pointers
+// n is the number of pointers.
+// note: n > 0
+//       s and n are undefined afterwards
+************************************************************************/
+
+#if (UCL_UINT_MAX <= SIZE_T_MAX) && defined(HAVE_MEMSET)
+
+#if 1
+#define BZERO8_PTR(s,l,n)   memset((s),0,(ucl_uint)(l)*(n))
+#else
+#define BZERO8_PTR(s,l,n)   memset((ucl_voidp)(s),0,(ucl_uint)(l)*(n))
+#endif
+
+#else
+
+#define BZERO8_PTR(s,l,n) \
+    ucl_memset((ucl_voidp)(s),0,(ucl_uint)(l)*(n))
+
+#endif
+
+
+/***********************************************************************
+// rotate (not used at the moment)
+************************************************************************/
+
+#if 0
+#if defined(__GNUC__) && defined(__i386__)
+
+unsigned char ucl_rotr8(unsigned char value, int shift);
+extern __inline__ unsigned char ucl_rotr8(unsigned char value, int shift)
+{
+    unsigned char result;
+
+    __asm__ __volatile__ ("movb %b1, %b0; rorb %b2, %b0"
+                        : "=a"(result) : "g"(value), "c"(shift));
+    return result;
+}
+
+unsigned short ucl_rotr16(unsigned short value, int shift);
+extern __inline__ unsigned short ucl_rotr16(unsigned short value, int shift)
+{
+    unsigned short result;
+
+    __asm__ __volatile__ ("movw %b1, %b0; rorw %b2, %b0"
+                        : "=a"(result) : "g"(value), "c"(shift));
+    return result;
+}
+
+#endif
+#endif
+
+
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /* already included */
+
+/*
+vi:ts=4:et
+*/