text: // $Id: CDR_Base.cpp 91685 2010-09-09 09:35:14Z johnnyw $
  
  #include "ace/CDR_Base.h"
  
  #if !defined (__ACE_INLINE__)
  # include "ace/CDR_Base.inl"
  #endif /* ! __ACE_INLINE__ */
  
  #include "ace/Message_Block.h"
  #include "ace/OS_Memory.h"
  #include "ace/OS_NS_string.h"
  
  ACE_BEGIN_VERSIONED_NAMESPACE_DECL
  
  #if defined (NONNATIVE_LONGDOUBLE)
  static const ACE_INT16 max_eleven_bit = 0x3ff;
  static const ACE_INT16 max_fifteen_bit = 0x3fff;
  #endif /* NONNATIVE_LONGDOUBLE */
  
  //
  // See comments in CDR_Base.inl about optimization cases for swap_XX_array.
  //
  
  void
  ACE_CDR::swap_2_array (char const * orig, char* target, size_t n)
  {
    // ACE_ASSERT(n > 0); The caller checks that n > 0
  
    // We pretend that AMD64/GNU G++ systems have a Pentium CPU to
    // take advantage of the inline assembly implementation.
  
    // Later, we try to read in 32 or 64 bit chunks,
    // so make sure we don't do that for unaligned addresses.
  #if ACE_SIZEOF_LONG == 8 && \
      !((defined(__amd64__) || defined (__x86_64__)) && defined(__GNUG__))
    char const * const o8 = ACE_ptr_align_binary (orig, 8);
    while (orig < o8 && n > 0)
      {
        ACE_CDR::swap_2 (orig, target);
        orig += 2;
        target += 2;
        --n;
      }
  #else
    char const * const o4 = ACE_ptr_align_binary (orig, 4);
    // this is an _if_, not a _while_. The mistmatch can only be by 2.
    if (orig != o4)
      {
        ACE_CDR::swap_2 (orig, target);
        orig += 2;
        target += 2;
        --n;
      }
  #endif
    if (n == 0)
      return;
  
    //
    // Loop unrolling. Here be dragons.
    //
  
    // (n & (~3)) is the greatest multiple of 4 not bigger than n.
    // In the while loop ahead, orig will move over the array by 8 byte
    // increments (4 elements of 2 bytes).
    // end marks our barrier for not falling outside.
    char const * const end = orig + 2 * (n & (~3));
  
    // See if we're aligned for writting in 64 or 32 bit chunks...
  #if ACE_SIZEOF_LONG == 8 && \
      !((defined(__amd64__) || defined (__x86_64__)) && defined(__GNUG__))
    if (target == ACE_ptr_align_binary (target, 8))
  #else
    if (target == ACE_ptr_align_binary (target, 4))
  #endif
      {
        while (orig < end)
          {
  #if defined (ACE_HAS_INTEL_ASSEMBLY)
            unsigned int a =
              * reinterpret_cast<const unsigned int*> (orig);
            unsigned int b =
              * reinterpret_cast<const unsigned int*> (orig + 4);
            asm ( "bswap %1"      : "=r" (a) : "0" (a) );
            asm ( "bswap %1"      : "=r" (b) : "0" (b) );
            asm ( "rol $16, %1"   : "=r" (a) : "0" (a) );
            asm ( "rol $16, %1"   : "=r" (b) : "0" (b) );
            * reinterpret_cast<unsigned int*> (target) = a;
            * reinterpret_cast<unsigned int*> (target + 4) = b;
  #elif defined(ACE_HAS_PENTIUM) \
        && (defined(_MSC_VER) || defined(__BORLANDC__)) \
        && !defined(ACE_LACKS_INLINE_ASSEMBLY)
            __asm mov ecx, orig;
            __asm mov edx, target;
            __asm mov eax, [ecx];
            __asm mov ebx, 4[ecx];
            __asm bswap eax;
            __asm bswap ebx;
            __asm rol eax, 16;
            __asm rol ebx, 16;
            __asm mov [edx], eax;
            __asm mov 4[edx], ebx;
  #elif ACE_SIZEOF_LONG == 8
            // 64 bit architecture.
            register unsigned long a =
              * reinterpret_cast<const unsigned long*> (orig);
  
            register unsigned long a1 = (a & 0x00ff00ff00ff00ffUL) << 8;
            register unsigned long a2 = (a & 0xff00ff00ff00ff00UL) >> 8;
  
            a = (a1 | a2);
  
            * reinterpret_cast<unsigned long*> (target) = a;
  #else
            register ACE_UINT32 a =
              * reinterpret_cast<const ACE_UINT32*> (orig);
            register ACE_UINT32 b =
              * reinterpret_cast<const ACE_UINT32*> (orig + 4);
  
            register ACE_UINT32 a1 = (a & 0x00ff00ffU) << 8;
            register ACE_UINT32 b1 = (b & 0x00ff00ffU) << 8;
            register ACE_UINT32 a2 = (a & 0xff00ff00U) >> 8;
            register ACE_UINT32 b2 = (b & 0xff00ff00U) >> 8;
  
            a = (a1 | a2);
            b = (b1 | b2);
  
            * reinterpret_cast<ACE_UINT32*> (target) = a;
            * reinterpret_cast<ACE_UINT32*> (target + 4) = b;
  #endif
            orig += 8;
            target += 8;
          }
      }
    else
      {
        // We're out of luck. We have to write in 2 byte chunks.
        while (orig < end)
          {
  #if defined (ACE_HAS_INTEL_ASSEMBLY)
            unsigned int a =
              * reinterpret_cast<const unsigned int*> (orig);
            unsigned int b =
              * reinterpret_cast<const unsigned int*> (orig + 4);
            asm ( "bswap %1" : "=r" (a) : "0" (a) );
            asm ( "bswap %1" : "=r" (b) : "0" (b) );
            // We're little endian.
            * reinterpret_cast<unsigned short*> (target + 2)
                = (unsigned short) (a & 0xffff);
            * reinterpret_cast<unsigned short*> (target + 6)
                = (unsigned short) (b & 0xffff);
            asm ( "shrl $16, %1" : "=r" (a) : "0" (a) );
            asm ( "shrl $16, %1" : "=r" (b) : "0" (b) );
            * reinterpret_cast<unsigned short*> (target + 0)
                = (unsigned short) (a & 0xffff);
            * reinterpret_cast<unsigned short*> (target + 4)
                = (unsigned short) (b & 0xffff);
  #elif defined (ACE_HAS_PENTIUM) \
        && (defined (_MSC_VER) || defined (__BORLANDC__)) \
        && !defined (ACE_LACKS_INLINE_ASSEMBLY)
            __asm mov ecx, orig;
            __asm mov edx, target;
            __asm mov eax, [ecx];
            __asm mov ebx, 4[ecx];
            __asm bswap eax;
            __asm bswap ebx;
            // We're little endian.
            __asm mov 2[edx], ax;
            __asm mov 6[edx], bx;
            __asm shr eax, 16;
            __asm shr ebx, 16;
            __asm mov 0[edx], ax;
            __asm mov 4[edx], bx;
  #elif ACE_SIZEOF_LONG == 8
            // 64 bit architecture.
            register unsigned long a =
              * reinterpret_cast<const unsigned long*> (orig);
  
            register unsigned long a1 = (a & 0x00ff00ff00ff00ffUL) << 8;
            register unsigned long a2 = (a & 0xff00ff00ff00ff00UL) >> 8;
  
            a = (a1 | a2);
  
            ACE_UINT16 b1 = static_cast<ACE_UINT16> (a >> 48);
            ACE_UINT16 b2 = static_cast<ACE_UINT16> ((a >> 32) & 0xffff);
            ACE_UINT16 b3 = static_cast<ACE_UINT16> ((a >> 16) & 0xffff);
            ACE_UINT16 b4 = static_cast<ACE_UINT16> (a & 0xffff);
  
  #if defined(ACE_LITTLE_ENDIAN)
            * reinterpret_cast<ACE_UINT16*> (target) = b4;
            * reinterpret_cast<ACE_UINT16*> (target + 2) = b3;
            * reinterpret_cast<ACE_UINT16*> (target + 4) = b2;
            * reinterpret_cast<ACE_UINT16*> (target + 6) = b1;
  #else
            * reinterpret_cast<ACE_UINT16*> (target) = b1;
            * reinterpret_cast<ACE_UINT16*> (target + 2) = b2;
            * reinterpret_cast<ACE_UINT16*> (target + 4) = b3;
            * reinterpret_cast<ACE_UINT16*> (target + 6) = b4;
  #endif
  #else
            register ACE_UINT32 a =
              * reinterpret_cast<const ACE_UINT32*> (orig);
            register ACE_UINT32 b =
              * reinterpret_cast<const ACE_UINT32*> (orig + 4);
  
            register ACE_UINT32 a1 = (a & 0x00ff00ff) << 8;
            register ACE_UINT32 b1 = (b & 0x00ff00ff) << 8;
            register ACE_UINT32 a2 = (a & 0xff00ff00) >> 8;
            register ACE_UINT32 b2 = (b & 0xff00ff00) >> 8;
  
            a = (a1 | a2);
            b = (b1 | b2);
  
            ACE_UINT32 c1 = static_cast<ACE_UINT16> (a >> 16);
            ACE_UINT32 c2 = static_cast<ACE_UINT16> (a & 0xffff);
            ACE_UINT32 c3 = static_cast<ACE_UINT16> (b >> 16);
            ACE_UINT32 c4 = static_cast<ACE_UINT16> (b & 0xffff);
  
  #if defined(ACE_LITTLE_ENDIAN)
            * reinterpret_cast<ACE_UINT16*> (target) = c2;
            * reinterpret_cast<ACE_UINT16*> (target + 2) = c1;
            * reinterpret_cast<ACE_UINT16*> (target + 4) = c4;
            * reinterpret_cast<ACE_UINT16*> (target + 6) = c3;
  #else
            * reinterpret_cast<ACE_UINT16*> (target) = c1;
            * reinterpret_cast<ACE_UINT16*> (target + 2) = c2;
            * reinterpret_cast<ACE_UINT16*> (target + 4) = c3;
            * reinterpret_cast<ACE_UINT16*> (target + 6) = c4;
  #endif
  #endif
  
            orig += 8;
            target += 8;
          }
      }
  
    // (n & 3) == (n % 4).
    switch (n&3) {
    case 3:
      ACE_CDR::swap_2 (orig, target);
      orig += 2;
      target += 2;
    case 2:
      ACE_CDR::swap_2 (orig, target);
      orig += 2;
      target += 2;
    case 1:
      ACE_CDR::swap_2 (orig, target);
    }
  }
  
  void
  ACE_CDR::swap_4_array (char const * orig, char* target, size_t n)
  {
    // ACE_ASSERT (n > 0); The caller checks that n > 0
  
  #if ACE_SIZEOF_LONG == 8
    // Later, we read from *orig in 64 bit chunks,
    // so make sure we don't generate unaligned readings.
    char const * const o8 = ACE_ptr_align_binary (orig, 8);
    // The mismatch can only be by 4.
    if (orig != o8)
      {
        ACE_CDR::swap_4 (orig, target);
        orig += 4;
        target += 4;
        --n;
      }
  #endif  /* ACE_SIZEOF_LONG == 8 */
  
    if (n == 0)
      return;
  
    //
    // Loop unrolling. Here be dragons.
    //
  
    // (n & (~3)) is the greatest multiple of 4 not bigger than n.
    // In the while loop, orig will move over the array by 16 byte
    // increments (4 elements of 4 bytes).
    // ends marks our barrier for not falling outside.
    char const * const end = orig + 4 * (n & (~3));
  
  #if ACE_SIZEOF_LONG == 8
    // 64 bits architecture.
    // See if we can write in 8 byte chunks.
    if (target == ACE_ptr_align_binary (target, 8))
      {
        while (orig < end)
          {
            register unsigned long a =
              * reinterpret_cast<const long*> (orig);
            register unsigned long b =
              * reinterpret_cast<const long*> (orig + 8);
  
  #if defined(ACE_HAS_INTEL_ASSEMBLY)
            asm ("bswapq %1" : "=r" (a) : "0" (a));
            asm ("bswapq %1" : "=r" (b) : "0" (b));
            asm ("rol $32, %1" : "=r" (a) : "0" (a));
            asm ("rol $32, %1" : "=r" (b) : "0" (b));
  #else
            register unsigned long a84 = (a & 0x000000ff000000ffL) << 24;
            register unsigned long b84 = (b & 0x000000ff000000ffL) << 24;
            register unsigned long a73 = (a & 0x0000ff000000ff00L) << 8;
            register unsigned long b73 = (b & 0x0000ff000000ff00L) << 8;
            register unsigned long a62 = (a & 0x00ff000000ff0000L) >> 8;
            register unsigned long b62 = (b & 0x00ff000000ff0000L) >> 8;
            register unsigned long a51 = (a & 0xff000000ff000000L) >> 24;
            register unsigned long b51 = (b & 0xff000000ff000000L) >> 24;
  
            a = (a84 | a73 | a62 | a51);
            b = (b84 | b73 | b62 | b51);
  #endif
  
            * reinterpret_cast<long*> (target) = a;
            * reinterpret_cast<long*> (target + 8) = b;
  
            orig += 16;
            target += 16;
          }
      }
    else
      {
        // We are out of luck, we have to write in 4 byte chunks.
        while (orig < end)
          {
            register unsigned long a =
              * reinterpret_cast<const long*> (orig);
            register unsigned long b =
              * reinterpret_cast<const long*> (orig + 8);
  
  #if defined(ACE_HAS_INTEL_ASSEMBLY)
            asm ("bswapq %1" : "=r" (a) : "0" (a));
            asm ("bswapq %1" : "=r" (b) : "0" (b));
            asm ("rol $32, %1" : "=r" (a) : "0" (a));
            asm ("rol $32, %1" : "=r" (b) : "0" (b));
  #else
            register unsigned long a84 = (a & 0x000000ff000000ffL) << 24;
            register unsigned long b84 = (b & 0x000000ff000000ffL) << 24;
            register unsigned long a73 = (a & 0x0000ff000000ff00L) << 8;
            register unsigned long b73 = (b & 0x0000ff000000ff00L) << 8;
            register unsigned long a62 = (a & 0x00ff000000ff0000L) >> 8;
            register unsigned long b62 = (b & 0x00ff000000ff0000L) >> 8;
            register unsigned long a51 = (a & 0xff000000ff000000L) >> 24;
            register unsigned long b51 = (b & 0xff000000ff000000L) >> 24;
  
            a = (a84 | a73 | a62 | a51);
            b = (b84 | b73 | b62 | b51);
  #endif
  
            ACE_UINT32 c1 = static_cast<ACE_UINT32> (a >> 32);
            ACE_UINT32 c2 = static_cast<ACE_UINT32> (a & 0xffffffff);
            ACE_UINT32 c3 = static_cast<ACE_UINT32> (b >> 32);
            ACE_UINT32 c4 = static_cast<ACE_UINT32> (b & 0xffffffff);
  
  #if defined (ACE_LITTLE_ENDIAN)
            * reinterpret_cast<ACE_UINT32*> (target + 0) = c2;
            * reinterpret_cast<ACE_UINT32*> (target + 4) = c1;
            * reinterpret_cast<ACE_UINT32*> (target + 8) = c4;
            * reinterpret_cast<ACE_UINT32*> (target + 12) = c3;
  #else
            * reinterpret_cast<ACE_UINT32*> (target + 0) = c1;
            * reinterpret_cast<ACE_UINT32*> (target + 4) = c2;
            * reinterpret_cast<ACE_UINT32*> (target + 8) = c3;
            * reinterpret_cast<ACE_UINT32*> (target + 12) = c4;
  #endif
            orig += 16;
            target += 16;
          }
      }
  
  #else  /* ACE_SIZEOF_LONG != 8 */
  
    while (orig < end)
      {
  #if defined (ACE_HAS_PENTIUM) && defined (__GNUG__)
        register unsigned int a =
          *reinterpret_cast<const unsigned int*> (orig);
        register unsigned int b =
          *reinterpret_cast<const unsigned int*> (orig + 4);
        register unsigned int c =
          *reinterpret_cast<const unsigned int*> (orig + 8);
        register unsigned int d =
          *reinterpret_cast<const unsigned int*> (orig + 12);
  
        asm ("bswap %1" : "=r" (a) : "0" (a));
        asm ("bswap %1" : "=r" (b) : "0" (b));
        asm ("bswap %1" : "=r" (c) : "0" (c));
        asm ("bswap %1" : "=r" (d) : "0" (d));
  
        *reinterpret_cast<unsigned int*> (target) = a;
        *reinterpret_cast<unsigned int*> (target + 4) = b;
        *reinterpret_cast<unsigned int*> (target + 8) = c;
        *reinterpret_cast<unsigned int*> (target + 12) = d;
  #elif defined (ACE_HAS_PENTIUM) \
        && (defined (_MSC_VER) || defined (__BORLANDC__)) \
        && !defined (ACE_LACKS_INLINE_ASSEMBLY)
        __asm mov eax, orig
        __asm mov esi, target
        __asm mov edx, [eax]
        __asm mov ecx, 4[eax]
        __asm mov ebx, 8[eax]
        __asm mov eax, 12[eax]
        __asm bswap edx
        __asm bswap ecx
        __asm bswap ebx
        __asm bswap eax
        __asm mov [esi], edx
        __asm mov 4[esi], ecx
        __asm mov 8[esi], ebx
        __asm mov 12[esi], eax
  #else
        register ACE_UINT32 a =
          * reinterpret_cast<const ACE_UINT32*> (orig);
        register ACE_UINT32 b =
          * reinterpret_cast<const ACE_UINT32*> (orig + 4);
        register ACE_UINT32 c =
          * reinterpret_cast<const ACE_UINT32*> (orig + 8);
        register ACE_UINT32 d =
          * reinterpret_cast<const ACE_UINT32*> (orig + 12);
  
        // Expect the optimizer reordering this A LOT.
        // We leave it this way for clarity.
        a = (a << 24) | ((a & 0xff00) << 8) | ((a & 0xff0000) >> 8) | (a >> 24);
        b = (b << 24) | ((b & 0xff00) << 8) | ((b & 0xff0000) >> 8) | (b >> 24);
        c = (c << 24) | ((c & 0xff00) << 8) | ((c & 0xff0000) >> 8) | (c >> 24);
        d = (d << 24) | ((d & 0xff00) << 8) | ((d & 0xff0000) >> 8) | (d >> 24);
  
        * reinterpret_cast<ACE_UINT32*> (target) = a;
        * reinterpret_cast<ACE_UINT32*> (target + 4) = b;
        * reinterpret_cast<ACE_UINT32*> (target + 8) = c;
        * reinterpret_cast<ACE_UINT32*> (target + 12) = d;
  #endif
  
        orig += 16;
        target += 16;
      }
  
  #endif /* ACE_SIZEOF_LONG == 8 */
  
    // (n & 3) == (n % 4).
    switch (n & 3) {
    case 3:
      ACE_CDR::swap_4 (orig, target);
      orig += 4;
      target += 4;
    case 2:
      ACE_CDR::swap_4 (orig, target);
      orig += 4;
      target += 4;
    case 1:
      ACE_CDR::swap_4 (orig, target);
    }
  }
  
  //
  // We don't benefit from unrolling in swap_8_array and swap_16_array
  // (swap_8 and swap_16 are big enough).
  //
  void
  ACE_CDR::swap_8_array (char const * orig, char* target, size_t n)
  {
    // ACE_ASSERT(n > 0); The caller checks that n > 0
  
    char const * const end = orig + 8*n;
    while (orig < end)
      {
        swap_8 (orig, target);
        orig += 8;
        target += 8;
      }
  }
  
  void
  ACE_CDR::swap_16_array (char const * orig, char* target, size_t n)
  {
    // ACE_ASSERT(n > 0); The caller checks that n > 0
  
    char const * const end = orig + 16*n;
    while (orig < end)
      {
        swap_16 (orig, target);
        orig += 16;
        target += 16;
      }
  }
  
  void
  ACE_CDR::mb_align (ACE_Message_Block *mb)
  {
  #if !defined (ACE_CDR_IGNORE_ALIGNMENT)
    char * const start = ACE_ptr_align_binary (mb->base (),
                                               ACE_CDR::MAX_ALIGNMENT);
  #else
    char * const start = mb->base ();
  #endif /* ACE_CDR_IGNORE_ALIGNMENT */
    mb->rd_ptr (start);
    mb->wr_ptr (start);
  }
  
  int
  ACE_CDR::grow (ACE_Message_Block *mb, size_t minsize)
  {
    size_t newsize =
      ACE_CDR::first_size (minsize + ACE_CDR::MAX_ALIGNMENT);
  
    if (newsize <= mb->size ())
      return 0;
  
    ACE_Data_Block *db =
      mb->data_block ()->clone_nocopy (0, newsize);
  
    if (db == 0)
      return -1;
  
    // Do the equivalent of ACE_CDR::mb_align() here to avoid having
    // to allocate an ACE_Message_Block on the stack thereby avoiding
    // the manipulation of the data blocks reference count
    size_t mb_len = mb->length ();
    char *start = ACE_ptr_align_binary (db->base (),
                                        ACE_CDR::MAX_ALIGNMENT);
  
    ACE_OS::memcpy (start, mb->rd_ptr (), mb_len);
    mb->data_block (db);
  
    // Setting the data block on the mb resets the read and write
    // pointers back to the beginning.  We must set the rd_ptr to the
    // aligned start and adjust the write pointer to the end
    mb->rd_ptr (start);
    mb->wr_ptr (start + mb_len);
  
    // Remove the DONT_DELETE flags from mb
    mb->clr_self_flags (ACE_Message_Block::DONT_DELETE);
  
    return 0;
  }
  
  size_t
  ACE_CDR::total_length (const ACE_Message_Block* begin,
                         const ACE_Message_Block* end)
  {
    size_t l = 0;
    // Compute the total size.
    for (const ACE_Message_Block *i = begin;
         i != end;
         i = i->cont ())
      l += i->length ();
    return l;
  }
  
  int
  ACE_CDR::consolidate (ACE_Message_Block *dst,
                        const ACE_Message_Block *src)
  {
    if (src == 0)
      return 0;
  
    size_t const newsize =
      ACE_CDR::first_size (ACE_CDR::total_length (src, 0)
                           + ACE_CDR::MAX_ALIGNMENT);
  
    if (dst->size (newsize) == -1)
      return -1;
  
  #if !defined (ACE_CDR_IGNORE_ALIGNMENT)
    // We must copy the contents of src into the new buffer, but
    // respecting the alignment.
    ptrdiff_t srcalign =
      ptrdiff_t(src->rd_ptr ()) % ACE_CDR::MAX_ALIGNMENT;
    ptrdiff_t dstalign =
      ptrdiff_t(dst->rd_ptr ()) % ACE_CDR::MAX_ALIGNMENT;
    ptrdiff_t offset = srcalign - dstalign;
    if (offset < 0)
      offset += ACE_CDR::MAX_ALIGNMENT;
    dst->rd_ptr (static_cast<size_t> (offset));
    dst->wr_ptr (dst->rd_ptr ());
  #endif /* ACE_CDR_IGNORE_ALIGNMENT */
  
    for (const ACE_Message_Block* i = src;
         i != 0;
         i = i->cont ())
      {
        // If the destination and source are the same, do not
        // attempt to copy the data.  Just update the write pointer.
        if (dst->wr_ptr () != i->rd_ptr ())
          dst->copy (i->rd_ptr (), i->length ());
        else
          dst->wr_ptr (i->length ());
      }
    return 0;
  }
  
  #if defined (NONNATIVE_LONGLONG)
  bool
  ACE_CDR::LongLong::operator== (const ACE_CDR::LongLong &rhs) const
  {
    return this->h == rhs.h && this->l == rhs.l;
  }
  
  bool
  ACE_CDR::LongLong::operator!= (const ACE_CDR::LongLong &rhs) const
  {
    return this->l != rhs.l || this->h != rhs.h;
  }
  
  #endif /* NONNATIVE_LONGLONG */
  
  #if defined (NONNATIVE_LONGDOUBLE)
  ACE_CDR::LongDouble&
  ACE_CDR::LongDouble::assign (const ACE_CDR::LongDouble::NativeImpl& rhs)
  {
    ACE_OS::memset (this->ld, 0, sizeof (this->ld));
  
    if (sizeof (rhs) == 8)
      {
  #if defined (ACE_LITTLE_ENDIAN)
        static const size_t byte_zero = 1;
        static const size_t byte_one = 0;
        char rhs_ptr[16];
        ACE_CDR::swap_8 (reinterpret_cast<const char*> (&rhs), rhs_ptr);
  #else
        static const size_t byte_zero = 0;
        static const size_t byte_one = 1;
        const char* rhs_ptr = reinterpret_cast<const char*> (&rhs);
  #endif
        ACE_INT16 sign  = static_cast<ACE_INT16> (
                            static_cast<signed char> (rhs_ptr[0])) & 0x8000;
        ACE_INT16 exponent = ((rhs_ptr[0] & 0x7f) << 4) |
                             ((rhs_ptr[1] >> 4) & 0xf);
        const char* exp_ptr = reinterpret_cast<const char*> (&exponent);
  
        // Infinity and NaN have an exponent of 0x7ff in 64-bit IEEE
        if (exponent == 0x7ff)
          {
            exponent = 0x7fff;
          }
        else
          {
            exponent = (exponent - max_eleven_bit) + max_fifteen_bit;
          }
        exponent |= sign;
  
        // Store the sign bit and exponent
        this->ld[0] = exp_ptr[byte_zero];
        this->ld[1] = exp_ptr[byte_one];
  
        // Store the mantissa.  In an 8 byte double, it is split by
        // 4 bits (because of the 12 bits for sign and exponent), so
        // we have to shift and or the rhs to get the right bytes.
        size_t li = 2;
        bool direction = true;
        for (size_t ri = 1; ri < sizeof (rhs);)
          {
            if (direction)
              {
                this->ld[li] |= ((rhs_ptr[ri] << 4) & 0xf0);
                direction = false;
                ++ri;
              }
            else
              {
                this->ld[li] |= ((rhs_ptr[ri] >> 4) & 0xf);
                direction = true;
                ++li;
              }
          }
  #if defined (ACE_LITTLE_ENDIAN)
        ACE_OS::memcpy (rhs_ptr, this->ld, sizeof (this->ld));
        ACE_CDR::swap_16 (rhs_ptr, this->ld);
  #endif
      }
    else
      {
        ACE_OS::memcpy(this->ld,
                       reinterpret_cast<const char*> (&rhs), sizeof (rhs));
      }
    return *this;
  }
  
  ACE_CDR::LongDouble&
  ACE_CDR::LongDouble::assign (const ACE_CDR::LongDouble& rhs)
  {
    if (this != &rhs)
      *this = rhs;
    return *this;
  }
  
  bool
  ACE_CDR::LongDouble::operator== (const ACE_CDR::LongDouble &rhs) const
  {
    return ACE_OS::memcmp (this->ld, rhs.ld, 16) == 0;
  }
  
  bool
  ACE_CDR::LongDouble::operator!= (const ACE_CDR::LongDouble &rhs) const
  {
    return ACE_OS::memcmp (this->ld, rhs.ld, 16) != 0;
  }
  
  ACE_CDR::LongDouble::operator ACE_CDR::LongDouble::NativeImpl () const
  {
    ACE_CDR::LongDouble::NativeImpl ret = 0.0;
    char* lhs_ptr = reinterpret_cast<char*> (&ret);
  
    if (sizeof (ret) == 8)
      {
  #if defined (ACE_LITTLE_ENDIAN)
        static const size_t byte_zero = 1;
        static const size_t byte_one = 0;
        char copy[16];
        ACE_CDR::swap_16 (this->ld, copy);
  #else
        static const size_t byte_zero = 0;
        static const size_t byte_one = 1;
        const char* copy = this->ld;
  #endif
        ACE_INT16 exponent = 0;
        char* exp_ptr = reinterpret_cast<char*> (&exponent);
        exp_ptr[byte_zero] = copy[0];
        exp_ptr[byte_one] = copy[1];
  
        ACE_INT16 sign = (exponent & 0x8000);
        exponent &= 0x7fff;
  
        // Infinity and NaN have an exponent of 0x7fff in 128-bit IEEE
        if (exponent == 0x7fff)
          {
            exponent = 0x7ff;
          }
        else
          {
            exponent = (exponent - max_fifteen_bit) + max_eleven_bit;
          }
        exponent = (exponent << 4) | sign;
  
        // Store the sign and exponent
        lhs_ptr[0] = exp_ptr[byte_zero];
        lhs_ptr[1] = exp_ptr[byte_one];
  
        // Store the mantissa.  In an 8 byte double, it is split by
        // 4 bits (because of the 12 bits for sign and exponent), so
        // we have to shift and or the rhs to get the right bytes.
        size_t li = 1;
        bool direction = true;
        for (size_t ri = 2; li < sizeof (ret);) {
          if (direction)
            {
              lhs_ptr[li] |= ((copy[ri] >> 4) & 0xf);
              direction = false;
              ++li;
            }
          else
            {
              lhs_ptr[li] |= ((copy[ri] & 0xf) << 4);
              direction = true;
              ++ri;
            }
        }
  
  #if defined (ACE_LITTLE_ENDIAN)
        ACE_CDR::swap_8 (lhs_ptr, lhs_ptr);
  #endif
      }
    else
      {
        ACE_OS::memcpy(lhs_ptr, this->ld, sizeof (ret));
      }
  
    // This bit of code is unnecessary.  However, this code is
    // necessary to work around a bug in the gcc 4.1.1 optimizer.
    ACE_CDR::LongDouble tmp;
    tmp.assign (ret);
  
    return ret;
  }
  #endif /* NONNATIVE_LONGDOUBLE */
  
  ACE_END_VERSIONED_NAMESPACE_DECL