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+// -*- C++ -*-
+
+//=============================================================================
+/**
+ * @file CDR_Base.h
+ *
+ * $Id$
+ *
+ * ACE Common Data Representation (CDR) basic types.
+ *
+ * The current implementation assumes that the host has 1-byte,
+ * 2-byte and 4-byte integral types, and that it has single
+ * precision and double precision IEEE floats.
+ * Those assumptions are pretty good these days, with Crays being
+ * the only known exception.
+ *
+ *
+ * @author TAO version by
+ * @author Aniruddha Gokhale <gokhale@cs.wustl.edu>
+ * @author Carlos O'Ryan<coryan@cs.wustl.edu>
+ * @author ACE version by
+ * @author Jeff Parsons <parsons@cs.wustl.edu>
+ * @author Istvan Buki <istvan.buki@euronet.be>
+ */
+//=============================================================================
+
+
+#ifndef ACE_CDR_BASE_H
+#define ACE_CDR_BASE_H
+
+#include /**/ "ace/pre.h"
+
+#include /**/ "ace/config-all.h"
+
+#if !defined (ACE_LACKS_PRAGMA_ONCE)
+# pragma once
+#endif /* ACE_LACKS_PRAGMA_ONCE */
+
+#include "ace/Basic_Types.h"
+#include "ace/Default_Constants.h"
+
+ACE_BEGIN_VERSIONED_NAMESPACE_DECL
+
+class ACE_Message_Block;
+
+/**
+ * @class ACE_CDR
+ *
+ * @brief Keep constants and some routines common to both Output and
+ * Input CDR streams.
+ */
+class ACE_Export ACE_CDR
+{
+public:
+ // = Constants defined by the CDR protocol.
+ // By defining as many of these constants as possible as enums we
+ // ensure they get inlined and avoid pointless static memory
+ // allocations.
+
+ enum
+ {
+ // Note that some of these get reused as part of the standard
+ // binary format: unsigned is the same size as its signed cousin,
+ // float is LONG_SIZE, and double is LONGLONG_SIZE.
+
+ OCTET_SIZE = 1,
+ SHORT_SIZE = 2,
+ LONG_SIZE = 4,
+ LONGLONG_SIZE = 8,
+ LONGDOUBLE_SIZE = 16,
+
+ OCTET_ALIGN = 1,
+ SHORT_ALIGN = 2,
+ LONG_ALIGN = 4,
+ LONGLONG_ALIGN = 8,
+ /// @note the CORBA LongDouble alignment requirements do not
+ /// match its size...
+ LONGDOUBLE_ALIGN = 8,
+
+ /// Maximal CDR 1.1 alignment: "quad precision" FP (i.e. "CDR::Long
+ /// double", size as above).
+ MAX_ALIGNMENT = 8,
+
+ /// The default buffer size.
+ /**
+ * @todo We want to add options to control this
+ * default value, so this constant should be read as the default
+ * default value ;-)
+ */
+ DEFAULT_BUFSIZE = ACE_DEFAULT_CDR_BUFSIZE,
+
+ /// The buffer size grows exponentially until it reaches this size;
+ /// afterwards it grows linearly using the next constant
+ EXP_GROWTH_MAX = ACE_DEFAULT_CDR_EXP_GROWTH_MAX,
+
+ /// Once exponential growth is ruled out the buffer size increases
+ /// in chunks of this size, note that this constants have the same
+ /// value right now, but it does not need to be so.
+ LINEAR_GROWTH_CHUNK = ACE_DEFAULT_CDR_LINEAR_GROWTH_CHUNK
+ };
+
+ /**
+ * Do byte swapping for each basic IDL type size. There exist only
+ * routines to put byte, halfword (2 bytes), word (4 bytes),
+ * doubleword (8 bytes) and quadword (16 byte); because those are
+ * the IDL basic type sizes.
+ */
+ static void swap_2 (char const *orig, char *target);
+ static void swap_4 (char const *orig, char *target);
+ static void swap_8 (char const *orig, char *target);
+ static void swap_16 (char const *orig, char *target);
+ static void swap_2_array (char const *orig,
+ char *target,
+ size_t length);
+ static void swap_4_array (char const *orig,
+ char *target,
+ size_t length);
+ static void swap_8_array (char const *orig,
+ char *target,
+ size_t length);
+ static void swap_16_array (char const *orig,
+ char *target,
+ size_t length);
+
+ /// Align the message block to ACE_CDR::MAX_ALIGNMENT,
+ /// set by the CORBA spec at 8 bytes.
+ static void mb_align (ACE_Message_Block *mb);
+
+ /**
+ * Compute the size of the smallest buffer that can contain at least
+ * @a minsize bytes.
+ * To understand how a "best fit" is computed look at the
+ * algorithm in the code.
+ * Basically the buffers grow exponentially, up to a certain point,
+ * then the buffer size grows linearly.
+ * The advantage of this algorithm is that is rapidly grows to a
+ * large value, but does not explode at the end.
+ */
+ static size_t first_size (size_t minsize);
+
+ /// Compute not the smallest, but the second smallest buffer that
+ /// will fir @a minsize bytes.
+ static size_t next_size (size_t minsize);
+
+ /**
+ * Increase the capacity of mb to contain at least @a minsize bytes.
+ * If @a minsize is zero the size is increased by an amount at least
+ * large enough to contain any of the basic IDL types.
+ * @retval -1 Failure
+ * @retval 0 Success.
+ */
+ static int grow (ACE_Message_Block *mb, size_t minsize);
+
+ /// Copy a message block chain into a single message block,
+ /// preserving the alignment of the first message block of the
+ /// original stream, not the following message blocks.
+ static void consolidate (ACE_Message_Block *dst,
+ const ACE_Message_Block *src);
+
+ static size_t total_length (const ACE_Message_Block *begin,
+ const ACE_Message_Block *end);
+
+ /**
+ * @name Basic OMG IDL Types
+ *
+ * These types are for use in the CDR classes. The cleanest way to
+ * avoid complaints from all compilers is to define them all.
+ */
+ //@{
+ typedef bool Boolean;
+ typedef unsigned char Octet;
+ typedef char Char;
+ typedef ACE_WCHAR_T WChar;
+ typedef ACE_INT16 Short;
+ typedef ACE_UINT16 UShort;
+ typedef ACE_INT32 Long;
+ typedef ACE_UINT32 ULong;
+ typedef ACE_UINT64 ULongLong;
+
+# if (defined (_MSC_VER)) || (defined (__BORLANDC__))
+ typedef __int64 LongLong;
+# elif ACE_SIZEOF_LONG == 8 && !defined(_CRAYMPP)
+ typedef long LongLong;
+# elif defined(__TANDEM)
+ typedef long long LongLong;
+# elif ACE_SIZEOF_LONG_LONG == 8 && !defined (ACE_LACKS_LONGLONG_T)
+# if defined (sun) && !defined (ACE_LACKS_U_LONGLONG_T)
+ // sun #defines u_longlong_t, maybe other platforms do also.
+ // Use it, at least with g++, so that its -pedantic doesn't
+ // complain about no ANSI C++ long long.
+ typedef longlong_t LongLong;
+# else
+ // LynxOS 2.5.0 and Linux don't have u_longlong_t.
+ typedef long long LongLong;
+# endif /* sun */
+# else /* no native 64 bit integer type */
+# define NONNATIVE_LONGLONG
+ struct ACE_Export LongLong
+ {
+# if defined (ACE_BIG_ENDIAN)
+ ACE_CDR::Long h;
+ ACE_CDR::Long l;
+# else
+ ACE_CDR::Long l;
+ ACE_CDR::Long h;
+# endif /* ! ACE_BIG_ENDIAN */
+
+ /**
+ * @name Overloaded Relation Operators.
+ *
+ * The canonical comparison operators.
+ */
+ //@{
+ bool operator== (const LongLong &rhs) const;
+ bool operator!= (const LongLong &rhs) const;
+ //@}
+ };
+# endif /* no native 64 bit integer type */
+
+# if defined (NONNATIVE_LONGLONG)
+# define ACE_CDR_LONGLONG_INITIALIZER {0,0}
+# else
+# define ACE_CDR_LONGLONG_INITIALIZER 0
+# endif /* NONNATIVE_LONGLONG */
+
+# if ACE_SIZEOF_FLOAT == 4
+ typedef float Float;
+# else /* ACE_SIZEOF_FLOAT != 4 */
+ struct Float
+ {
+# if ACE_SIZEOF_INT == 4
+ // Use unsigned int to get word alignment.
+ unsigned int f;
+# else /* ACE_SIZEOF_INT != 4 */
+ // Applications will probably have trouble with this.
+ char f[4];
+# if defined(_UNICOS) && !defined(_CRAYMPP)
+ Float (void);
+ Float (const float &init);
+ Float & operator= (const float &rhs);
+ bool operator!= (const Float &rhs) const;
+# endif /* _UNICOS */
+# endif /* ACE_SIZEOF_INT != 4 */
+ };
+# endif /* ACE_SIZEOF_FLOAT != 4 */
+
+# if ACE_SIZEOF_DOUBLE == 8
+ typedef double Double;
+# else /* ACE_SIZEOF_DOUBLE != 8 */
+ struct Double
+ {
+# if ACE_SIZEOF_LONG == 8
+ // Use u long to get word alignment.
+ unsigned long f;
+# else /* ACE_SIZEOF_INT != 8 */
+ // Applications will probably have trouble with this.
+ char f[8];
+# endif /* ACE_SIZEOF_INT != 8 */
+ };
+# endif /* ACE_SIZEOF_DOUBLE != 8 */
+
+ // 94-9-32 Appendix A defines a 128 bit floating point "long
+ // double" data type, with greatly extended precision and four
+ // more bits of exponent (compared to "double"). This is an IDL
+ // extension, not yet standard.
+
+# if ACE_SIZEOF_LONG_DOUBLE == 16
+ typedef long double LongDouble;
+# define ACE_CDR_LONG_DOUBLE_INITIALIZER 0
+# else
+# define NONNATIVE_LONGDOUBLE
+# define ACE_CDR_LONG_DOUBLE_INITIALIZER {{0}}
+ struct ACE_Export LongDouble
+ {
+ char ld[16];
+ bool operator== (const LongDouble &rhs) const;
+ bool operator!= (const LongDouble &rhs) const;
+ // @@ also need other comparison operators.
+ };
+# endif /* ACE_SIZEOF_LONG_DOUBLE != 16 */
+
+ //@}
+
+#if !defined (ACE_CDR_GIOP_MAJOR_VERSION)
+# define ACE_CDR_GIOP_MAJOR_VERSION 1
+#endif /*ACE_CDR_GIOP_MAJOR_VERSION */
+
+#if !defined (ACE_CDR_GIOP_MINOR_VERSION)
+# define ACE_CDR_GIOP_MINOR_VERSION 2
+#endif /* ACE_CDR_GIOP_MINOR_VERSION */
+};
+
+ACE_END_VERSIONED_NAMESPACE_DECL
+
+#if defined (__ACE_INLINE__)
+# include "ace/CDR_Base.inl"
+#endif /* __ACE_INLINE__ */
+
+
+#include /**/ "ace/post.h"
+
+#endif /* ACE_CDR_BASE_H */
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