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authorArne Schwabe <arne@rfc2549.org>2012-04-16 19:21:14 +0200
committerArne Schwabe <arne@rfc2549.org>2012-04-16 19:21:14 +0200
commit3e4d8f433239c40311037616b1b8833a06651ae0 (patch)
tree98ab7fce0d011d34677b0beb762d389cb5c39199 /lzo/src/lzo_ptr.h
Initial import
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+/* lzo_ptr.h -- low-level pointer constructs
+
+ This file is part of the LZO real-time data compression library.
+
+ Copyright (C) 2008 Markus Franz Xaver Johannes Oberhumer
+ Copyright (C) 2007 Markus Franz Xaver Johannes Oberhumer
+ Copyright (C) 2006 Markus Franz Xaver Johannes Oberhumer
+ Copyright (C) 2005 Markus Franz Xaver Johannes Oberhumer
+ Copyright (C) 2004 Markus Franz Xaver Johannes Oberhumer
+ Copyright (C) 2003 Markus Franz Xaver Johannes Oberhumer
+ Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer
+ Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer
+ Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer
+ Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer
+ Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer
+ Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer
+ Copyright (C) 1996 Markus Franz Xaver Johannes Oberhumer
+ All Rights Reserved.
+
+ The LZO 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 LZO 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 LZO library; see the file COPYING.
+ If not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+
+ Markus F.X.J. Oberhumer
+ <markus@oberhumer.com>
+ http://www.oberhumer.com/opensource/lzo/
+ */
+
+
+/* WARNING: this file should *not* be used by applications. It is
+ part of the implementation of the library and is subject
+ to change.
+ */
+
+
+#ifndef __LZO_PTR_H
+#define __LZO_PTR_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/***********************************************************************
+// Integral types
+************************************************************************/
+
+#if !defined(lzo_uintptr_t)
+# if defined(__LZO_MMODEL_HUGE)
+# define lzo_uintptr_t unsigned long
+# else
+# define lzo_uintptr_t acc_uintptr_t
+# ifdef __ACC_INTPTR_T_IS_POINTER
+# define __LZO_UINTPTR_T_IS_POINTER 1
+# endif
+# endif
+#endif
+
+
+/***********************************************************************
+//
+************************************************************************/
+
+/* Always use the safe (=integral) version for pointer-comparisions.
+ * The compiler should optimize away the additional casts anyway.
+ *
+ * Note that this only works if the representation and ordering
+ * of the pointer and the integral is the same (at bit level).
+ *
+ * Most 16-bit compilers have their own view about pointers -
+ * fortunately they don't care about comparing pointers
+ * that are pointing to Nirvana.
+ */
+
+#if (LZO_ARCH_I086)
+#define PTR(a) ((lzo_bytep) (a))
+/* only need the low bits of the pointer -> offset is ok */
+#define PTR_ALIGNED_4(a) ((ACC_PTR_FP_OFF(a) & 3) == 0)
+#define PTR_ALIGNED2_4(a,b) (((ACC_PTR_FP_OFF(a) | ACC_PTR_FP_OFF(b)) & 3) == 0)
+#elif (LZO_MM_PVP)
+#define PTR(a) ((lzo_bytep) (a))
+#define PTR_ALIGNED_8(a) ((((lzo_uintptr_t)(a)) >> 61) == 0)
+#define PTR_ALIGNED2_8(a,b) ((((lzo_uintptr_t)(a)|(lzo_uintptr_t)(b)) >> 61) == 0)
+#else
+#define PTR(a) ((lzo_uintptr_t) (a))
+#define PTR_LINEAR(a) PTR(a)
+#define PTR_ALIGNED_4(a) ((PTR_LINEAR(a) & 3) == 0)
+#define PTR_ALIGNED_8(a) ((PTR_LINEAR(a) & 7) == 0)
+#define PTR_ALIGNED2_4(a,b) (((PTR_LINEAR(a) | PTR_LINEAR(b)) & 3) == 0)
+#define PTR_ALIGNED2_8(a,b) (((PTR_LINEAR(a) | PTR_LINEAR(b)) & 7) == 0)
+#endif
+
+#define PTR_LT(a,b) (PTR(a) < PTR(b))
+#define PTR_GE(a,b) (PTR(a) >= PTR(b))
+#define PTR_DIFF(a,b) (PTR(a) - PTR(b))
+#define pd(a,b) ((lzo_uint) ((a)-(b)))
+
+
+LZO_EXTERN(lzo_uintptr_t)
+__lzo_ptr_linear(const lzo_voidp ptr);
+
+
+typedef union
+{
+ char a_char;
+ unsigned char a_uchar;
+ short a_short;
+ unsigned short a_ushort;
+ int a_int;
+ unsigned int a_uint;
+ long a_long;
+ unsigned long a_ulong;
+ lzo_int a_lzo_int;
+ lzo_uint a_lzo_uint;
+ lzo_int32 a_lzo_int32;
+ lzo_uint32 a_lzo_uint32;
+ ptrdiff_t a_ptrdiff_t;
+ lzo_uintptr_t a_lzo_uintptr_t;
+ lzo_voidp a_lzo_voidp;
+ void * a_void_p;
+ lzo_bytep a_lzo_bytep;
+ lzo_bytepp a_lzo_bytepp;
+ lzo_uintp a_lzo_uintp;
+ lzo_uint * a_lzo_uint_p;
+ lzo_uint32p a_lzo_uint32p;
+ lzo_uint32 * a_lzo_uint32_p;
+ unsigned char * a_uchar_p;
+ char * a_char_p;
+}
+lzo_full_align_t;
+
+
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /* already included */
+
+/*
+vi:ts=4:et
+*/
+