// -*- C++ -*- //============================================================================= /** * @file CDR_Stream.h * * $Id$ * * ACE Common Data Representation (CDR) marshaling and demarshaling * classes. * * This implementation was inspired in the CDR class in SunSoft's * IIOP engine, but has a completely different implementation and a * different interface too. * * 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 beign * the only known exception. * * @author TAO version by Aniruddha Gokhale * @author Carlos O'Ryan * @author ACE version by Jeff Parsons * @author Istvan Buki * @author Codeset translation by Jim Rogers */ //============================================================================= #ifndef ACE_CDR_STREAM_H #define ACE_CDR_STREAM_H #include /**/ "ace/pre.h" #include "ace/CDR_Base.h" #if !defined (ACE_LACKS_PRAGMA_ONCE) # pragma once #endif /* ACE_LACKS_PRAGMA_ONCE */ #include "ace/SStringfwd.h" #include "ace/Message_Block.h" // Stuff used by the ACE CDR classes. #if defined ACE_LITTLE_ENDIAN # define ACE_CDR_BYTE_ORDER 1 // little endian encapsulation byte order has value = 1 #else /* ! ACE_LITTLE_ENDIAN */ # define ACE_CDR_BYTE_ORDER 0 // big endian encapsulation byte order has value = 0 #endif /* ! ACE_LITTLE_ENDIAN */ class ACE_Char_Codeset_Translator; class ACE_WChar_Codeset_Translator; class ACE_InputCDR; /** * @class ACE_OutputCDR * * @brief A CDR stream for writing, i.e. for marshalling. * * This class is based on the the CORBA spec for Java (98-02-29), * java class omg.org.CORBA.portable.OutputStream. It diverts in * a few ways: * + Operations taking arrays don't have offsets, because in C++ * it is easier to describe an array starting from x+offset. * + Operations return an error status, because exceptions are * not widely available in C++ (yet). */ class ACE_Export ACE_OutputCDR { public: /** * The Codeset translators need access to some private members to * efficiently marshal arrays * For reading from an output CDR stream. */ friend class ACE_Char_Codeset_Translator; friend class ACE_WChar_Codeset_Translator; friend class ACE_InputCDR; /// Default constructor, allocates bytes in the internal /// buffer, if == 0 it allocates the default size. ACE_OutputCDR (size_t size = 0, int byte_order = ACE_CDR_BYTE_ORDER, ACE_Allocator* buffer_allocator = 0, ACE_Allocator* data_block_allocator = 0, ACE_Allocator* message_block_allocator = 0, size_t memcpy_tradeoff = ACE_DEFAULT_CDR_MEMCPY_TRADEOFF, ACE_CDR::Octet major_version = ACE_CDR_GIOP_MAJOR_VERSION, ACE_CDR::Octet minor_version = ACE_CDR_GIOP_MINOR_VERSION); /// Build a CDR stream with an initial buffer, it will *not* remove /// , since it did not allocated it. It's important to be careful /// with the alignment of . /** * Create an output stream from an arbitrary buffer, care must be * exercised with alignment, because this contructor will align if * needed. In this case will not point to the start off the * output stream. begin()->rd_prt() points to the start off the * output stream. See ACE_ptr_align_binary() to properly align a * pointer and use ACE_CDR::MAX_ALIGNMENT for the correct alignment. */ ACE_OutputCDR (char *data, size_t size, int byte_order = ACE_CDR_BYTE_ORDER, ACE_Allocator* buffer_allocator = 0, ACE_Allocator* data_block_allocator = 0, ACE_Allocator* message_block_allocator = 0, size_t memcpy_tradeoff= ACE_DEFAULT_CDR_MEMCPY_TRADEOFF, ACE_CDR::Octet giop_major_version = ACE_CDR_GIOP_MAJOR_VERSION, ACE_CDR::Octet giop_minor_version = ACE_CDR_GIOP_MINOR_VERSION); /// Build a CDR stream with an initial Message_Block chain, it will /// *not* remove , since it did not allocate it. ACE_OutputCDR (ACE_Message_Block *data, int byte_order = ACE_CDR_BYTE_ORDER, size_t memcpy_tradeoff= ACE_DEFAULT_CDR_MEMCPY_TRADEOFF, ACE_CDR::Octet giop_major_version = ACE_CDR_GIOP_MAJOR_VERSION, ACE_CDR::Octet giop_minor_version = ACE_CDR_GIOP_MINOR_VERSION); /// destructor ~ACE_OutputCDR (void); /** * Disambiguate overload when inserting booleans, octets, chars, and * bounded strings. */ //@{ @name Helper classes struct ACE_Export from_boolean { explicit from_boolean (ACE_CDR::Boolean b); ACE_CDR::Boolean val_; }; struct ACE_Export from_octet { explicit from_octet (ACE_CDR::Octet o); ACE_CDR::Octet val_; }; struct ACE_Export from_char { explicit from_char (ACE_CDR::Char c); ACE_CDR::Char val_; }; struct ACE_Export from_wchar { explicit from_wchar (ACE_CDR::WChar wc); ACE_CDR::WChar val_; }; struct ACE_Export from_string { from_string (ACE_CDR::Char* s, ACE_CDR::ULong b, ACE_CDR::Boolean nocopy = 0); from_string (const ACE_CDR::Char* s, ACE_CDR::ULong b, ACE_CDR::Boolean nocopy = 0); ACE_CDR::Char *val_; ACE_CDR::ULong bound_; ACE_CDR::Boolean nocopy_; }; struct ACE_Export from_wstring { from_wstring (ACE_CDR::WChar* ws, ACE_CDR::ULong b, ACE_CDR::Boolean nocopy = 0); from_wstring (const ACE_CDR::WChar* ws, ACE_CDR::ULong b, ACE_CDR::Boolean nocopy = 0); ACE_CDR::WChar *val_; ACE_CDR::ULong bound_; ACE_CDR::Boolean nocopy_; }; //@} // Return 0 on failure and 1 on success. //@{ @name Write operations ACE_CDR::Boolean write_boolean (ACE_CDR::Boolean x); ACE_CDR::Boolean write_char (ACE_CDR::Char x); ACE_CDR::Boolean write_wchar (ACE_CDR::WChar x); ACE_CDR::Boolean write_octet (ACE_CDR::Octet x); ACE_CDR::Boolean write_short (ACE_CDR::Short x); ACE_CDR::Boolean write_ushort (ACE_CDR::UShort x); ACE_CDR::Boolean write_long (ACE_CDR::Long x); ACE_CDR::Boolean write_ulong (ACE_CDR::ULong x); ACE_CDR::Boolean write_longlong (const ACE_CDR::LongLong &x); ACE_CDR::Boolean write_ulonglong (const ACE_CDR::ULongLong &x); ACE_CDR::Boolean write_float (ACE_CDR::Float x); ACE_CDR::Boolean write_double (const ACE_CDR::Double &x); ACE_CDR::Boolean write_longdouble (const ACE_CDR::LongDouble &x); /// For string we offer methods that accept a precomputed length. ACE_CDR::Boolean write_string (const ACE_CDR::Char *x); ACE_CDR::Boolean write_string (ACE_CDR::ULong len, const ACE_CDR::Char *x); ACE_CDR::Boolean write_string (const ACE_CString &x); ACE_CDR::Boolean write_wstring (const ACE_CDR::WChar *x); ACE_CDR::Boolean write_wstring (ACE_CDR::ULong length, const ACE_CDR::WChar *x); //@} /// Note: the portion written starts at and ends /// at . /// The length is *NOT* stored into the CDR stream. //@{ @name Array write operations ACE_CDR::Boolean write_boolean_array (const ACE_CDR::Boolean *x, ACE_CDR::ULong length); ACE_CDR::Boolean write_char_array (const ACE_CDR::Char *x, ACE_CDR::ULong length); ACE_CDR::Boolean write_wchar_array (const ACE_CDR::WChar* x, ACE_CDR::ULong length); ACE_CDR::Boolean write_octet_array (const ACE_CDR::Octet* x, ACE_CDR::ULong length); ACE_CDR::Boolean write_short_array (const ACE_CDR::Short *x, ACE_CDR::ULong length); ACE_CDR::Boolean write_ushort_array (const ACE_CDR::UShort *x, ACE_CDR::ULong length); ACE_CDR::Boolean write_long_array (const ACE_CDR::Long *x, ACE_CDR::ULong length); ACE_CDR::Boolean write_ulong_array (const ACE_CDR::ULong *x, ACE_CDR::ULong length); ACE_CDR::Boolean write_longlong_array (const ACE_CDR::LongLong* x, ACE_CDR::ULong length); ACE_CDR::Boolean write_ulonglong_array (const ACE_CDR::ULongLong *x, ACE_CDR::ULong length); ACE_CDR::Boolean write_float_array (const ACE_CDR::Float *x, ACE_CDR::ULong length); ACE_CDR::Boolean write_double_array (const ACE_CDR::Double *x, ACE_CDR::ULong length); ACE_CDR::Boolean write_longdouble_array (const ACE_CDR::LongDouble* x, ACE_CDR::ULong length); /// Write an octet array contained inside a MB, this can be optimized /// to minimize copies. ACE_CDR::Boolean write_octet_array_mb (const ACE_Message_Block* mb); //@} /** * Return 0 on failure and 1 on success. */ //@{ @name Append contents of own CDR stream to another ACE_CDR::Boolean append_boolean (ACE_InputCDR &); ACE_CDR::Boolean append_char (ACE_InputCDR &); ACE_CDR::Boolean append_wchar (ACE_InputCDR &); ACE_CDR::Boolean append_octet (ACE_InputCDR &); ACE_CDR::Boolean append_short (ACE_InputCDR &); ACE_CDR::Boolean append_ushort (ACE_InputCDR &); ACE_CDR::Boolean append_long (ACE_InputCDR &); ACE_CDR::Boolean append_ulong (ACE_InputCDR &); ACE_CDR::Boolean append_longlong (ACE_InputCDR &); ACE_CDR::Boolean append_ulonglong (ACE_InputCDR &); ACE_CDR::Boolean append_float (ACE_InputCDR &); ACE_CDR::Boolean append_double (ACE_InputCDR &); ACE_CDR::Boolean append_longdouble (ACE_InputCDR &); ACE_CDR::Boolean append_wstring (ACE_InputCDR &); ACE_CDR::Boolean append_string (ACE_InputCDR &); //@} /// Returns @c false if an error has ocurred. /** * @note The only expected error is to run out of memory. */ bool good_bit (void) const; /// Reuse the CDR stream to write on the old buffer. void reset (void); /// Add the length of each message block in the chain. size_t total_length (void) const; /** * Return the start of the message block chain for this CDR stream. * NOTE: The complete CDR stream is represented by a chain of * message blocks. */ const ACE_Message_Block *begin (void) const; /// Return the last message in the chain that is is use. const ACE_Message_Block *end (void) const; /// Return the message block in chain. const ACE_Message_Block *current (void) const; /** * Access the underlying buffer (read only). NOTE: This * method only returns a pointer to the first block in the * chain. */ const char *buffer (void) const; /** * Return the start and size of the internal buffer.NOTE: This * method only returns information about the first block in the * chain. */ size_t length (void) const; /** * Utility function to allow the user more flexibility. * Pads the stream up to the nearest -byte boundary. * Argument MUST be a power of 2. * Returns 0 on success and -1 on failure. */ int align_write_ptr (size_t alignment); /// Access the codeset translators. They can be null! ACE_Char_Codeset_Translator *char_translator (void) const; ACE_WChar_Codeset_Translator *wchar_translator (void) const; /// Set the char codeset translator. void char_translator (ACE_Char_Codeset_Translator *); /// Set the wchar codeset translator. void wchar_translator (ACE_WChar_Codeset_Translator *); /// set the global size of serialized wchars. This may be different /// than the size of a wchar_t. static void wchar_maxbytes (int ); /// access the serialized size of wchars. static int wchar_maxbytes (void); /** * Return alignment of the wr_ptr(), with respect to the start of * the CDR stream. This is not the same as the alignment of * current->wr_ptr()! */ size_t current_alignment (void) const; /** * Returns (in ) the next position in the buffer aligned to * , it advances the Message_Block wr_ptr past the data * (i.e., + ). If necessary it grows the Message_Block * buffer. Sets the good_bit to 0 and returns a -1 on failure. */ int adjust (size_t size, char *&buf); /// As above, but now the size and alignment requirements may be /// different. int adjust (size_t size, size_t align, char *&buf); /// If non-zero then this stream is writing in non-native byte order, /// this is only meaningful if ACE_ENABLE_SWAP_ON_WRITE is defined. bool do_byte_swap (void) const; /// If returns 0, this returns ACE_CDR_BYTE_ORDER else /// it returns !ACE_CDR_BYTE_ORDER. int byte_order (void) const; /// For use by a gateway, which creates the output stream for the /// reply to the client in its native byte order, but which must /// send the reply in the byte order of the target's reply to the /// gateway. void reset_byte_order (int byte_order); /// set GIOP version info int set_version (ACE_CDR::Octet major, ACE_CDR::Octet minor); /// Set the underlying GIOP version.. int get_version (ACE_CDR::Octet &major, ACE_CDR::Octet &minor); private: /// disallow copying... ACE_OutputCDR (const ACE_OutputCDR& rhs); ACE_OutputCDR& operator= (const ACE_OutputCDR& rhs); ACE_CDR::Boolean write_1 (const ACE_CDR::Octet *x); ACE_CDR::Boolean write_2 (const ACE_CDR::UShort *x); ACE_CDR::Boolean write_4 (const ACE_CDR::ULong *x); ACE_CDR::Boolean write_8 (const ACE_CDR::ULongLong *x); ACE_CDR::Boolean write_16 (const ACE_CDR::LongDouble *x); /** * write an array of elements, each of bytes and the * start aligned at a multiple of . The elements are assumed * to be packed with the right alignment restrictions. It is mostly * designed for buffers of the basic types. * * This operation uses ; as explained above it is expected * that using assignment is faster that for one element, * but for several elements should be more efficient, it * could be interesting to find the break even point and optimize * for that case, but that would be too platform dependent. */ ACE_CDR::Boolean write_array (const void *x, size_t size, size_t align, ACE_CDR::ULong length); ACE_CDR::Boolean write_wchar_array_i (const ACE_CDR::WChar* x, ACE_CDR::ULong length); /** * Grow the CDR stream. When it returns contains a pointer to * memory in the CDR stream, with at least bytes ahead of it * and aligned to an boundary. It moved the to . */ int grow_and_adjust (size_t size, size_t align, char *&buf); private: /// The start of the chain of message blocks. ACE_Message_Block start_; /// The current block in the chain were we are writing. ACE_Message_Block *current_; /** * The current alignment as measured from the start of the buffer. * Usually this coincides with the alignment of the buffer in * memory, but, when we chain another buffer this "quasi invariant" * is broken. * The current_alignment is used to readjust the buffer following * the stolen message block. */ size_t current_alignment_; /** * Is the current block writable. When we steal a buffer from the * user and just chain it into the message block we are not supposed * to write on it, even if it is past the start and end of the * buffer. */ bool current_is_writable_; /** * If not zero swap bytes at writing so the created CDR stream byte * order does *not* match the machine byte order. The motivation * for such a beast is that in some setting a few (fast) machines * can be serving hundreds of slow machines with the opposite byte * order, so it makes sense (as a load balancing device) to put the * responsibility in the writers. THIS IS NOT A STANDARD IN CORBA, * USE AT YOUR OWN RISK */ bool do_byte_swap_; /// Set to 0 when an error ocurrs. bool good_bit_; /// Break-even point for copying. size_t memcpy_tradeoff_; protected: /// GIOP version information ACE_CDR::Octet major_version_; ACE_CDR::Octet minor_version_; /// If not nil, invoke for translation of character and string data. ACE_Char_Codeset_Translator *char_translator_; ACE_WChar_Codeset_Translator *wchar_translator_; /** * Some wide char codesets may be defined with a maximum number * of bytes that is smaller than the size of a wchar_t. This means * that the CDR cannot simply memcpy a block of wchars to and from * the stream, but must instead realign the bytes appropriately. * In cases when wchar i/o is not allowed, such as with GIOP 1.0, * or not having a native wchar codeset defined, the maxbytes is * set to zero, indicating no wchar data is allowed. */ static int wchar_maxbytes_; }; // **************************************************************** /** * @class ACE_InputCDR * * @brief A CDR stream for reading, i.e. for demarshalling. * * This class is based on the the CORBA spec for Java (98-02-29), * java class omg.org.CORBA.portable.InputStream. It diverts in a * few ways: * + Operations to retrieve basic types take parameters by * reference. * + Operations taking arrays don't have offsets, because in C++ * it is easier to describe an array starting from x+offset. * + Operations return an error status, because exceptions are * not widely available in C++ (yet). */ class ACE_Export ACE_InputCDR { public: /// The translator need privileged access to efficiently demarshal /// arrays and the such friend class ACE_Char_Codeset_Translator; friend class ACE_WChar_Codeset_Translator; /** * Create an input stream from an arbitrary buffer. The buffer must * be properly aligned because this contructor will *not* work if * the buffer is aligned unproperly.See ACE_ptr_align_binary() for * instructions on how to align a pointer properly and use * ACE_CDR::MAX_ALIGNMENT for the correct alignment. */ ACE_InputCDR (const char *buf, size_t bufsiz, int byte_order = ACE_CDR_BYTE_ORDER, ACE_CDR::Octet major_version = ACE_CDR_GIOP_MAJOR_VERSION, ACE_CDR::Octet minor_version = ACE_CDR_GIOP_MINOR_VERSION); /// Create an empty input stream. The caller is responsible for /// putting the right data and providing the right alignment. ACE_InputCDR (size_t bufsiz, int byte_order = ACE_CDR_BYTE_ORDER, ACE_CDR::Octet major_version = ACE_CDR_GIOP_MAJOR_VERSION, ACE_CDR::Octet minor_version = ACE_CDR_GIOP_MINOR_VERSION); /// Create an input stream from an ACE_Message_Block /** * The alignment of the @arg data block is carried into the new * ACE_InputCDR object. This constructor either increments the * @arg data reference count, or copies the data (if it's a compound * message block) so the caller can release the block immediately * upon return. */ ACE_InputCDR (const ACE_Message_Block *data, int byte_order = ACE_CDR_BYTE_ORDER, ACE_CDR::Octet major_version = ACE_CDR_GIOP_MAJOR_VERSION, ACE_CDR::Octet minor_version = ACE_CDR_GIOP_MINOR_VERSION); /// Create an input stream from an ACE_Data_Block. The /// indicates whether the can be deleted by the CDR stream /// or not ACE_InputCDR (ACE_Data_Block *data, ACE_Message_Block::Message_Flags flag = 0, int byte_order = ACE_CDR_BYTE_ORDER, ACE_CDR::Octet major_version = ACE_CDR_GIOP_MAJOR_VERSION, ACE_CDR::Octet minor_version = ACE_CDR_GIOP_MINOR_VERSION); /// Create an input stream from an ACE_Data_Block. It also sets the /// read and write pointers at the desired positions. This would be /// helpful if the applications desires to create a new CDR stream /// from a semi-processed datablock. ACE_InputCDR (ACE_Data_Block *data, ACE_Message_Block::Message_Flags flag, size_t read_pointer_position, size_t write_pointer_position, int byte_order = ACE_CDR_BYTE_ORDER, ACE_CDR::Octet major_version = ACE_CDR_GIOP_MAJOR_VERSION, ACE_CDR::Octet minor_version = ACE_CDR_GIOP_MINOR_VERSION); /** * These make a copy of the current stream state, but do not copy * the internal buffer, so the same stream can be read multiple * times efficiently. */ ACE_InputCDR (const ACE_InputCDR& rhs); ACE_InputCDR& operator= (const ACE_InputCDR& rhs); /// When interpreting indirected TypeCodes it is useful to make a /// "copy" of the stream starting in the new position. ACE_InputCDR (const ACE_InputCDR& rhs, size_t size, ACE_CDR::Long offset); /// This creates an encapsulated stream, the first byte must be (per /// the spec) the byte order of the encapsulation. ACE_InputCDR (const ACE_InputCDR& rhs, size_t size); /// Create an input CDR from an output CDR. ACE_InputCDR (const ACE_OutputCDR& rhs, ACE_Allocator* buffer_allocator = 0, ACE_Allocator* data_block_allocator = 0, ACE_Allocator* message_block_allocator = 0); /// Helper class to transfer the contents from one input CDR to /// another without requiring any extra memory allocations, data /// copies or too many temporaries. struct ACE_Export Transfer_Contents { Transfer_Contents (ACE_InputCDR &rhs); ACE_InputCDR &rhs_; }; /// Transfer the contents from to a new CDR ACE_InputCDR (Transfer_Contents rhs); /// Destructor ~ACE_InputCDR (void); /// Disambiguate overloading when extracting octets, chars, /// booleans, and bounded strings //@{ @name Helper classes struct ACE_Export to_boolean { explicit to_boolean (ACE_CDR::Boolean &b); ACE_CDR::Boolean &ref_; }; struct ACE_Export to_char { explicit to_char (ACE_CDR::Char &c); ACE_CDR::Char &ref_; }; struct ACE_Export to_wchar { explicit to_wchar (ACE_CDR::WChar &wc); ACE_CDR::WChar &ref_; }; struct ACE_Export to_octet { explicit to_octet (ACE_CDR::Octet &o); ACE_CDR::Octet &ref_; }; struct ACE_Export to_string { /** * @deprecated The constructor taking a non-const string is now * deprecated (C++ mapping 00-01-02), but we keep it * around for backward compatibility. */ to_string (ACE_CDR::Char *&s, ACE_CDR::ULong b); to_string (const ACE_CDR::Char *&s, ACE_CDR::ULong b); const ACE_CDR::Char *&val_; ACE_CDR::ULong bound_; }; struct ACE_Export to_wstring { /// The constructor taking a non-const wstring is /// now deprecated (C++ mapping 00-01-02), but we /// keep it around for backward compatibility. to_wstring (ACE_CDR::WChar *&ws, ACE_CDR::ULong b); to_wstring (const ACE_CDR::WChar *&ws, ACE_CDR::ULong b); const ACE_CDR::WChar *&val_; ACE_CDR::ULong bound_; }; //@} /** * Return @c false on failure and @c true on success. */ //@{ @name Read basic IDL types ACE_CDR::Boolean read_boolean (ACE_CDR::Boolean& x); ACE_CDR::Boolean read_char (ACE_CDR::Char &x); ACE_CDR::Boolean read_wchar (ACE_CDR::WChar& x); ACE_CDR::Boolean read_octet (ACE_CDR::Octet& x); ACE_CDR::Boolean read_short (ACE_CDR::Short &x); ACE_CDR::Boolean read_ushort (ACE_CDR::UShort &x); ACE_CDR::Boolean read_long (ACE_CDR::Long &x); ACE_CDR::Boolean read_ulong (ACE_CDR::ULong &x); ACE_CDR::Boolean read_longlong (ACE_CDR::LongLong& x); ACE_CDR::Boolean read_ulonglong (ACE_CDR::ULongLong& x); ACE_CDR::Boolean read_float (ACE_CDR::Float &x); ACE_CDR::Boolean read_double (ACE_CDR::Double &x); ACE_CDR::Boolean read_longdouble (ACE_CDR::LongDouble &x); ACE_CDR::Boolean read_string (ACE_CDR::Char *&x); ACE_CDR::Boolean read_string (ACE_CString &x); ACE_CDR::Boolean read_wstring (ACE_CDR::WChar*& x); //@} /** * The buffer @a x must be large enough to contain @a length * elements. * Return @c false on failure and @c true on success. */ //@{ @name Read basic IDL types arrays ACE_CDR::Boolean read_boolean_array (ACE_CDR::Boolean* x, ACE_CDR::ULong length); ACE_CDR::Boolean read_char_array (ACE_CDR::Char *x, ACE_CDR::ULong length); ACE_CDR::Boolean read_wchar_array (ACE_CDR::WChar* x, ACE_CDR::ULong length); ACE_CDR::Boolean read_octet_array (ACE_CDR::Octet* x, ACE_CDR::ULong length); ACE_CDR::Boolean read_short_array (ACE_CDR::Short *x, ACE_CDR::ULong length); ACE_CDR::Boolean read_ushort_array (ACE_CDR::UShort *x, ACE_CDR::ULong length); ACE_CDR::Boolean read_long_array (ACE_CDR::Long *x, ACE_CDR::ULong length); ACE_CDR::Boolean read_ulong_array (ACE_CDR::ULong *x, ACE_CDR::ULong length); ACE_CDR::Boolean read_longlong_array (ACE_CDR::LongLong* x, ACE_CDR::ULong length); ACE_CDR::Boolean read_ulonglong_array (ACE_CDR::ULongLong* x, ACE_CDR::ULong length); ACE_CDR::Boolean read_float_array (ACE_CDR::Float *x, ACE_CDR::ULong length); ACE_CDR::Boolean read_double_array (ACE_CDR::Double *x, ACE_CDR::ULong length); ACE_CDR::Boolean read_longdouble_array (ACE_CDR::LongDouble* x, ACE_CDR::ULong length); //@} /** * Return @c false on failure and @c true on success. */ //@{ @name Skip elements ACE_CDR::Boolean skip_boolean (void); ACE_CDR::Boolean skip_char (void); ACE_CDR::Boolean skip_wchar (void); ACE_CDR::Boolean skip_octet (void); ACE_CDR::Boolean skip_short (void); ACE_CDR::Boolean skip_ushort (void); ACE_CDR::Boolean skip_long (void); ACE_CDR::Boolean skip_ulong (void); ACE_CDR::Boolean skip_longlong (void); ACE_CDR::Boolean skip_ulonglong (void); ACE_CDR::Boolean skip_float (void); ACE_CDR::Boolean skip_double (void); ACE_CDR::Boolean skip_longdouble (void); //@} /** * The next field must be a string, this method skips it. It is * useful in parsing a TypeCode. * @return @c false on failure and @c true on success. */ ACE_CDR::Boolean skip_wstring (void); ACE_CDR::Boolean skip_string (void); /// Skip @a n bytes in the CDR stream. /** * @return @c false on failure and @c true on success. */ ACE_CDR::Boolean skip_bytes (size_t n); /// returns @c false if a problem has been detected. bool good_bit (void) const; /** * @return The start of the message block chain for this CDR * stream. * * @note In the current implementation the chain has length 1, but * we are planning to change that. */ const ACE_Message_Block* start (void) const; // = The following functions are useful to read the contents of the // CDR stream from a socket or file. /** * Grow the internal buffer, reset @c rd_ptr to the first byte in * the new buffer that is properly aligned, and set @c wr_ptr to @c * rd_ptr @c + @c newsize */ int grow (size_t newsize); /** * After reading and partially parsing the contents the user can * detect a change in the byte order, this method will let him/her * change it. */ void reset_byte_order (int byte_order); /// Re-initialize the CDR stream, copying the contents of the chain /// of message_blocks starting from @a data. void reset (const ACE_Message_Block *data, int byte_order); /// Steal the contents from the current CDR. ACE_Message_Block *steal_contents (void); /// Steal the contents of @a cdr and make a shallow copy into this /// stream. void steal_from (ACE_InputCDR &cdr); /// Exchange data blocks with the caller of this method. The read /// and write pointers are also exchanged. /** * @note We now do only with the start_ message block. */ void exchange_data_blocks (ACE_InputCDR &cdr); /// Copy the data portion from the @c cdr to this cdr and return the /// data content (ie. the ACE_Data_Block) from this CDR to the /// caller. /** * @note The caller is responsible for managing the memory of the * returned ACE_Data_Block. */ ACE_Data_Block* clone_from (ACE_InputCDR &cdr); /// Re-initialize the CDR stream, forgetting about the old contents /// of the stream and allocating a new buffer (from the allocators). void reset_contents (void); /// Returns the current position for the @c rd_ptr. char* rd_ptr (void); /// Returns the current position for the @c wr_ptr. char* wr_ptr (void); /// Return how many bytes are left in the stream. size_t length (void) const; /** * Utility function to allow the user more flexibility. * Skips up to the nearest @a alignment-byte boundary. * Argument MUST be a power of 2. * * @return 0 on success and -1 on failure. */ int align_read_ptr (size_t alignment); /// If @c true then this stream is writing in non-native byte order. /// This is only meaningful if ACE_ENABLE_SWAP_ON_WRITE is defined. bool do_byte_swap (void) const; /// If @c do_byte_swap() returns @c false, this returns /// ACE_CDR_BYTE_ORDER else it returns !ACE_CDR_BYTE_ORDER. int byte_order (void) const; /// Access the codeset translators. They can be nil! ACE_Char_Codeset_Translator *char_translator (void) const; ACE_WChar_Codeset_Translator *wchar_translator (void) const; /// Set the codeset translators. void char_translator (ACE_Char_Codeset_Translator *); void wchar_translator (ACE_WChar_Codeset_Translator *); /** * Returns (in @a buf) the next position in the buffer aligned to * @a size. It advances the Message_Block @c rd_ptr past the data * (i.e., @c buf @c + @c size). Sets the good_bit to @c false and * returns a -1 on failure. */ int adjust (size_t size, char *&buf); /// As above, but now the size and alignment requirements may be /// different. int adjust (size_t size, size_t align, char *&buf); /// Set the underlying GIOP version.. int set_version (ACE_CDR::Octet major, ACE_CDR::Octet minor); /// Set the underlying GIOP version.. int get_version (ACE_CDR::Octet &major, ACE_CDR::Octet &minor); protected: /// The start of the chain of message blocks, even though in the /// current version the chain always has length 1. ACE_Message_Block start_; /// The CDR stream byte order does not match the one on the machine, /// swapping is needed while reading. bool do_byte_swap_; /// set to @c false when an error occurs. bool good_bit_; /// The GIOP versions for this stream ACE_CDR::Octet major_version_; ACE_CDR::Octet minor_version_; /// If not nil, invoke for translation of character and string data. ACE_Char_Codeset_Translator *char_translator_; ACE_WChar_Codeset_Translator *wchar_translator_; private: ACE_CDR::Boolean read_1 (ACE_CDR::Octet *x); ACE_CDR::Boolean read_2 (ACE_CDR::UShort *x); ACE_CDR::Boolean read_4 (ACE_CDR::ULong *x); ACE_CDR::Boolean read_8 (ACE_CDR::ULongLong *x); ACE_CDR::Boolean read_16 (ACE_CDR::LongDouble *x); // Several types can be read using the same routines, since TAO // tries to use native types with known size for each CORBA type. // We could use void* or char* to make the interface more // consistent, but using native types let us exploit the strict // alignment requirements of CDR streams and implement the // operations using asignment. /** * Read an array of elements, each of bytes and the * start aligned at a multiple of . The elements are assumed * to be packed with the right alignment restrictions. It is mostly * designed for buffers of the basic types. * * This operation uses ; as explained above it is expected * that using assignment is faster that for one element, * but for several elements should be more efficient, it * could be interesting to find the break even point and optimize * for that case, but that would be too platform dependent. */ ACE_CDR::Boolean read_array (void* x, size_t size, size_t align, ACE_CDR::ULong length); /** * On those occasions when the native codeset for wchar is smaller than * the size of a wchar_t, such as using UTF-16 with a 4-byte wchar_t, a * special form of reading the array is needed. Actually, this should be * a default translator. */ ACE_CDR::Boolean read_wchar_array_i (ACE_CDR::WChar * x, ACE_CDR::ULong length); /// Move the rd_ptr ahead by bytes. void rd_ptr (size_t offset); /// Points to the continuation field of the current message block. char* end (void); }; // **************************************************************** /** * @class ACE_Char_Codeset_Translator * * @brief Codeset translation routines common to both Output and Input * CDR streams. * * This class is a base class for defining codeset translation * routines to handle the character set translations required by * both CDR Input streams and CDR Output streams. * * Translators are reference counted. This allows for stateful as well * as stateless translators. Stateless translators will be allocated * once whereas CDR Streams own their own copy of a stateful translator. */ class ACE_Export ACE_Char_Codeset_Translator { public: virtual ~ACE_Char_Codeset_Translator () {}; /// Read a single character from the stream, converting from the /// stream codeset to the native codeset virtual ACE_CDR::Boolean read_char (ACE_InputCDR&, ACE_CDR::Char&) = 0; /// Read a string from the stream, including the length, converting /// the characters from the stream codeset to the native codeset virtual ACE_CDR::Boolean read_string (ACE_InputCDR&, ACE_CDR::Char *&) = 0; /// Read an array of characters from the stream, converting the /// characters from the stream codeset to the native codeset. virtual ACE_CDR::Boolean read_char_array (ACE_InputCDR&, ACE_CDR::Char*, ACE_CDR::ULong) = 0; /// Write a single character to the stream, converting from the /// native codeset to the stream codeset virtual ACE_CDR::Boolean write_char (ACE_OutputCDR&, ACE_CDR::Char) = 0; /// Write a string to the stream, including the length, converting /// from the native codeset to the stream codeset virtual ACE_CDR::Boolean write_string (ACE_OutputCDR&, ACE_CDR::ULong, const ACE_CDR::Char*) = 0; /// Write an array of characters to the stream, converting from the /// native codeset to the stream codeset virtual ACE_CDR::Boolean write_char_array (ACE_OutputCDR&, const ACE_CDR::Char*, ACE_CDR::ULong) = 0; virtual ACE_CDR::ULong ncs () = 0; virtual ACE_CDR::ULong tcs () = 0; protected: /// Children have access to low-level routines because they cannot /// use read_char or something similar (it would recurse). ACE_CDR::Boolean read_1 (ACE_InputCDR& input, ACE_CDR::Octet *x); ACE_CDR::Boolean write_1 (ACE_OutputCDR& output, const ACE_CDR::Octet *x); /// Efficiently read elements of size each from /// into ; the data must be aligned to . ACE_CDR::Boolean read_array (ACE_InputCDR& input, void* x, size_t size, size_t align, ACE_CDR::ULong length); /** * Efficiently write elements of size from into * . Before inserting the elements enough padding is added * to ensure that the elements will be aligned to in the * stream. */ ACE_CDR::Boolean write_array (ACE_OutputCDR& output, const void *x, size_t size, size_t align, ACE_CDR::ULong length); /** * Exposes the stream implementation of , this is useful in * many cases to minimize memory allocations during marshaling. * On success will contain a contiguous area in the CDR stream * that can hold bytes aligned to . * Results */ int adjust (ACE_OutputCDR& out, size_t size, size_t align, char *&buf); /// Used by derived classes to set errors in the CDR stream. void good_bit (ACE_OutputCDR& out, bool bit); /// Obtain the CDR Stream's major & minor version values. ACE_CDR::Octet major_version (ACE_InputCDR& input); ACE_CDR::Octet minor_version (ACE_InputCDR& input); ACE_CDR::Octet major_version (ACE_OutputCDR& output); ACE_CDR::Octet minor_version (ACE_OutputCDR& output); }; // **************************************************************** /** * @class ACE_WChar_Codeset_Translator * * @brief Codeset translation routines common to both Output and Input * CDR streams. * * This class is a base class for defining codeset translation * routines to handle the character set translations required by * both CDR Input streams and CDR Output streams. */ class ACE_Export ACE_WChar_Codeset_Translator { public: virtual ~ACE_WChar_Codeset_Translator () {} virtual ACE_CDR::Boolean read_wchar (ACE_InputCDR&, ACE_CDR::WChar&) = 0; virtual ACE_CDR::Boolean read_wstring (ACE_InputCDR&, ACE_CDR::WChar *&) = 0; virtual ACE_CDR::Boolean read_wchar_array (ACE_InputCDR&, ACE_CDR::WChar*, ACE_CDR::ULong) = 0; virtual ACE_CDR::Boolean write_wchar (ACE_OutputCDR&, ACE_CDR::WChar) = 0; virtual ACE_CDR::Boolean write_wstring (ACE_OutputCDR&, ACE_CDR::ULong, const ACE_CDR::WChar*) = 0; virtual ACE_CDR::Boolean write_wchar_array (ACE_OutputCDR&, const ACE_CDR::WChar*, ACE_CDR::ULong) = 0; virtual ACE_CDR::ULong ncs () = 0; virtual ACE_CDR::ULong tcs () = 0; protected: /// Children have access to low-level routines because they cannot /// use read_char or something similar (it would recurse). ACE_CDR::Boolean read_1 (ACE_InputCDR& input, ACE_CDR::Octet *x); ACE_CDR::Boolean read_2 (ACE_InputCDR& input, ACE_CDR::UShort *x); ACE_CDR::Boolean read_4 (ACE_InputCDR& input, ACE_CDR::ULong *x); ACE_CDR::Boolean write_1 (ACE_OutputCDR& output, const ACE_CDR::Octet *x); ACE_CDR::Boolean write_2 (ACE_OutputCDR& output, const ACE_CDR::UShort *x); ACE_CDR::Boolean write_4 (ACE_OutputCDR& output, const ACE_CDR::ULong *x); /// Efficiently read elements of size each from /// into ; the data must be aligned to . ACE_CDR::Boolean read_array (ACE_InputCDR& input, void* x, size_t size, size_t align, ACE_CDR::ULong length); /** * Efficiently write elements of size from into * . Before inserting the elements enough padding is added * to ensure that the elements will be aligned to in the * stream. */ ACE_CDR::Boolean write_array (ACE_OutputCDR& output, const void *x, size_t size, size_t align, ACE_CDR::ULong length); /** * Exposes the stream implementation of , this is useful in * many cases to minimize memory allocations during marshaling. * On success will contain a contiguous area in the CDR stream * that can hold bytes aligned to . * Results */ int adjust (ACE_OutputCDR& out, size_t size, size_t align, char *&buf); /// Used by derived classes to set errors in the CDR stream. void good_bit (ACE_OutputCDR& out, bool bit); /// Obtain the CDR Stream's major & minor version values. ACE_CDR::Octet major_version (ACE_InputCDR& input); ACE_CDR::Octet minor_version (ACE_InputCDR& input); ACE_CDR::Octet major_version (ACE_OutputCDR& output); ACE_CDR::Octet minor_version (ACE_OutputCDR& output); }; // @@ These operators should not be inlined since they force SString.h // to be included in this header. extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os, const ACE_CString &x); extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is, ACE_CString &x); #if defined (__ACE_INLINE__) # include "ace/CDR_Stream.inl" #else /* __ACE_INLINE__ */ // Not used by CORBA or TAO extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os, ACE_CDR::Char x); // CDR output operators for primitive types extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os, ACE_CDR::Short x); extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os, ACE_CDR::UShort x); extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os, ACE_CDR::Long x); extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os, ACE_CDR::ULong x); extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os, ACE_CDR::LongLong x); extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os, ACE_CDR::ULongLong x); extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR& os, ACE_CDR::LongDouble x); extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os, ACE_CDR::Float x); extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os, ACE_CDR::Double x); // CDR output operator from helper classes extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os, ACE_OutputCDR::from_boolean x); extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os, ACE_OutputCDR::from_char x); extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os, ACE_OutputCDR::from_wchar x); extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os, ACE_OutputCDR::from_octet x); extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os, ACE_OutputCDR::from_string x); extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os, ACE_OutputCDR::from_wstring x); extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os, const ACE_CDR::Char* x); extern ACE_Export ACE_CDR::Boolean operator<< (ACE_OutputCDR &os, const ACE_CDR::WChar* x); // Not used by CORBA or TAO extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is, ACE_CDR::Char &x); // CDR input operators for primitive types extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is, ACE_CDR::Short &x); extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is, ACE_CDR::UShort &x); extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is, ACE_CDR::Long &x); extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is, ACE_CDR::ULong &x); extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is, ACE_CDR::LongLong &x); extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is, ACE_CDR::ULongLong &x); extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is, ACE_CDR::LongDouble &x); extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is, ACE_CDR::Float &x); extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is, ACE_CDR::Double &x); // CDR input operator from helper classes extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is, ACE_InputCDR::to_boolean x); extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is, ACE_InputCDR::to_char x); extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is, ACE_InputCDR::to_wchar x); extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is, ACE_InputCDR::to_octet x); extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is, ACE_InputCDR::to_string x); extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is, ACE_InputCDR::to_wstring x); extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is, ACE_CDR::Char*& x); extern ACE_Export ACE_CDR::Boolean operator>> (ACE_InputCDR &is, ACE_CDR::WChar*& x); #endif /* __ACE_INLINE__ */ #include /**/ "ace/post.h" #endif /* ACE_CDR_STREAM_H */