path: root/ace/CDR_Stream.cpp

// $Id$

#define ACE_BUILD_DLL
#include "ace/CDR_Stream.h"

#if !defined (__ACE_INLINE__)
# include "ace/CDR_Stream.i"
#endif /* ! __ACE_INLINE__ */

ACE_RCSID(ace, CDR_Stream, "$Id$")

int
ACE_CDR::grow (ACE_Message_Block *mb, size_t minsize)
{
  // Calculate the new buffer's length; if growing for encode, we
  // don't grow in "small" chunks because of the cost.

  size_t size = mb->size();
  size_t newsize = size;

  if (minsize == 0)
    {
      // TODO The growth strategy should be controlled using
      // the ORB parameters....
      if (newsize == 0)
        newsize = ACE_CDR::DEFAULT_BUFSIZE;
      else if (size < ACE_CDR::EXP_GROWTH_MAX)
        newsize *= 2;
      else
        newsize += ACE_CDR::LINEAR_GROWTH_CHUNK;
    }
  else if (minsize + ACE_CDR::MAX_ALIGNMENT <= size)
    return 0;
  else
    {
      if (newsize == 0)
        newsize = ACE_CDR::DEFAULT_BUFSIZE;

      while (newsize < minsize + ACE_CDR::MAX_ALIGNMENT)
        {
          if (newsize < ACE_CDR::EXP_GROWTH_MAX)
            newsize *= 2;
          else
            newsize += ACE_CDR::LINEAR_GROWTH_CHUNK;
        }
    }

  ACE_Message_Block tmp (newsize);

  ACE_CDR::mb_align (&tmp);

  tmp.copy (mb->rd_ptr (), mb->length());
  mb->data_block (tmp.data_block ()->duplicate ());
  mb->rd_ptr (tmp.rd_ptr ());
  mb->wr_ptr (tmp.wr_ptr ());

  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;
}


#if defined (NONNATIVE_LONGDOUBLE)
int
ACE_CDR::LongDouble::operator== (const ACE_CDR::LongDouble &rhs) const
{
  return ACE_OS::memcmp (this->ld, rhs.ld, 16) == 0;
}

int
ACE_CDR::LongDouble::operator!= (const ACE_CDR::LongDouble &rhs) const
{
  return ACE_OS::memcmp (this->ld, rhs.ld, 16) != 0;
}
#endif /* NONNATIVE_LONGDOUBLE */

#if defined(_UNICOS) && !defined(_CRAYMPP)
// placeholders to get things compiling
ACE_CDR::Float::Float()
{
}

ACE_CDR::Float::Float(const float & init)
{
}

ACE_CDR::Float &
ACE_CDR::Float::operator= (const float &rhs)
{
    return *this;
}

int
ACE_CDR::Float::operator!= (const ACE_CDR::Float &rhs) const
{
    return 0;
}
#endif /* _UNICOS */

// ****************************************************************

ACE_OutputCDR::ACE_OutputCDR (size_t size,
                              int byte_order,
                              ACE_Allocator *buffer_allocator,
                              ACE_Allocator *data_block_allocator,
                              size_t memcpy_tradeoff)
  :  start_ (size ? size : ACE_CDR::DEFAULT_BUFSIZE + ACE_CDR::MAX_ALIGNMENT,
             ACE_Message_Block::MB_DATA,
             0,
             0,
             buffer_allocator,
             0,
             0,
             ACE_Time_Value::zero,
             ACE_Time_Value::max_time,
             data_block_allocator),
     do_byte_swap_ (byte_order != ACE_CDR_BYTE_ORDER),
     good_bit_ (1),
     memcpy_tradeoff_ (memcpy_tradeoff),
     char_translator_ (0),
     wchar_translator_ (0)
{
  ACE_CDR::mb_align (&this->start_);
  this->current_ = &this->start_;
}

ACE_OutputCDR::ACE_OutputCDR (char *data, size_t size,
                              int byte_order,
                              ACE_Allocator *buffer_allocator,
                              ACE_Allocator *data_block_allocator,
                              size_t memcpy_tradeoff)
  :  start_ (size,
             ACE_Message_Block::MB_DATA,
             0,
             data,
             buffer_allocator,
             0,
             0,
             ACE_Time_Value::zero,
             ACE_Time_Value::max_time,
             data_block_allocator),
     do_byte_swap_ (byte_order != ACE_CDR_BYTE_ORDER),
     good_bit_ (1),
     memcpy_tradeoff_ (memcpy_tradeoff),
     char_translator_ (0),
     wchar_translator_ (0)
{
  // We cannot trust the buffer to be properly aligned
  ACE_CDR::mb_align (&this->start_);
  this->current_ = &this->start_;
}

ACE_OutputCDR::ACE_OutputCDR (ACE_Message_Block *data,
                              int byte_order,
                              size_t memcpy_tradeoff)
  :  start_ (data->data_block ()->duplicate ()),
     do_byte_swap_ (byte_order != ACE_CDR_BYTE_ORDER),
     good_bit_ (1),
     memcpy_tradeoff_ (memcpy_tradeoff),
     char_translator_ (0),
     wchar_translator_ (0)
{
  // We cannot trust the buffer to be properly aligned
  ACE_CDR::mb_align (&this->start_);
  this->current_ = &this->start_;
}

int
ACE_OutputCDR::grow_and_adjust (size_t size,
                                size_t align,
                                char*& buf)
{
  if (this->current_->cont () == 0
      || this->current_->cont ()->size () < size + ACE_CDR::MAX_ALIGNMENT)
    {
      // Allocate the next block, it must be large enough.
      size_t block_size = ACE_CDR::DEFAULT_BUFSIZE;
      while (block_size < size + ACE_CDR::MAX_ALIGNMENT)
        {
          if (block_size < ACE_CDR::EXP_GROWTH_MAX)
            block_size *= 2;
          else
            block_size += ACE_CDR::LINEAR_GROWTH_CHUNK;
        }
      this->good_bit_ = 0;
      ACE_Message_Block* tmp;
      ACE_NEW_RETURN (tmp,
                      ACE_Message_Block (block_size,
                                         ACE_Message_Block::MB_DATA,
                                         0,
                                         0,
                                         this->current_->data_block ()->allocator_strategy (),
                                         0,
                                         0,
                                         ACE_Time_Value::zero,
                                         ACE_Time_Value::max_time,
                                         this->current_->data_block ()->data_block_allocator ()),
                      -1);
      this->good_bit_ = 1;

      // The new block must start with the same alignment as the
      // previous block finished.
      ptr_arith_t tmpalign =
        ptr_arith_t(tmp->wr_ptr ()) % ACE_CDR::MAX_ALIGNMENT;
      ptr_arith_t curalign =
        ptr_arith_t(this->current_->wr_ptr ()) % ACE_CDR::MAX_ALIGNMENT;
      int offset = curalign - tmpalign;
      if (offset < 0)
        offset += ACE_CDR::MAX_ALIGNMENT;
      tmp->rd_ptr (offset);
      tmp->wr_ptr (tmp->rd_ptr ());

      // grow the chain and set the current block.
      tmp->cont (this->current_->cont ());
      this->current_->cont (tmp);
    }
  this->current_ = this->current_->cont ();

  // Now we are ready to set buf..
  // recompute the position....
  buf = ptr_align_binary (this->current_->wr_ptr (), align);
  this->current_->wr_ptr (buf + size);
  return 0;
}

ACE_CDR::Boolean
ACE_OutputCDR::write_string (ACE_CDR::ULong len,
                             const char *x)
{
  // @@ This is a slight violation of "Optimize for the common case",
  // i.e. normally the translator will be 0, but OTOH the code is
  // smaller and should be better for the cache ;-) ;-)
  if (this->char_translator_ != 0)
    return this->char_translator_->write_string (*this, len, x);

  if (len != 0)
    {
      if (this->write_ulong (len + 1))
        {
          return this->write_char_array (x, len + 1);
        }
    }
  else
    {
      // Be nice to programmers: treat nulls as empty strings not
      // errors. (OMG-IDL supports languages that don't use the C/C++
      // notion of null v. empty strings; nulls aren't part of the OMG-IDL
      // string model.)
      if (this->write_ulong (1))
        {
          return this->write_char (0);
        }
    }

  return 0;
}

ACE_CDR::Boolean
ACE_OutputCDR::write_wstring (ACE_CDR::ULong len,
                              const ACE_CDR::WChar *x)
{
  // @@ This is a slight violation of "Optimize for the common case",
  // i.e. normally the translator will be 0, but OTOH the code is
  // smaller and should be better for the cache ;-) ;-)
  if (this->wchar_translator_ != 0)
    return this->wchar_translator_->write_wstring (*this, len, x);

  if (x != 0)
    {
      if (this->write_ulong (len + 1))
        {
          return this->write_wchar_array (x, len + 1);
        }
    }
  else
    {
      if (this->write_ulong (1))
        {
          return this->write_wchar (0);
        }
    }
  return 0;
}

ACE_CDR::Boolean
ACE_OutputCDR::write_octet_array_mb (const ACE_Message_Block* mb)
{
  // If the buffer is small and it fits in the current message
  // block it is be cheaper just to copy the buffer.
  for (const ACE_Message_Block* i = mb;
       i != 0;
       i = i->cont ())
    {
      size_t length = i->length ();

      // If the mb does not own its data we are forced to make a copy.
      if (ACE_BIT_ENABLED (i->flags (),
                           ACE_Message_Block::DONT_DELETE))
        {
          if (! this->write_array (i->rd_ptr (),
                                   ACE_CDR::OCTET_SIZE,
                                   ACE_CDR::OCTET_ALIGN,
                                   length))
            {
              return 0;
            }
          continue;
        }

      if (length < this->memcpy_tradeoff_
          && this->current_->wr_ptr () + length < this->current_->end ())
        {
          if (! this->write_array (i->rd_ptr (),
                                   ACE_CDR::OCTET_SIZE,
                                   ACE_CDR::OCTET_ALIGN,
                                   length))
            {
              return 0;
            }
          continue;
        }

      ACE_Message_Block* cont =
        new ACE_Message_Block (i->data_block ()->duplicate ());
      if (cont != 0)
        {
          cont->cont (this->current_->cont ());
          this->current_->cont (cont);
          this->current_ = cont;
          cont->rd_ptr (i->rd_ptr ());
          cont->wr_ptr (i->wr_ptr ());
        }
      else
        {
          this->good_bit_ = 0;
          return 0;
        }
    }
  return 1;
}

ACE_CDR::Boolean
ACE_OutputCDR::write_1 (const ACE_CDR::Octet *x)
{
  char *buf;
  if (this->adjust (1, buf) == 0)
    {
      *ACE_reinterpret_cast(ACE_CDR::Octet*, buf) = *x;
      return 1;
    }

  return 0;
}

ACE_CDR::Boolean
ACE_OutputCDR::write_2 (const ACE_CDR::UShort *x)
{
  char *buf;
  if (this->adjust (ACE_CDR::SHORT_SIZE, buf) == 0)
    {
#if !defined (ACE_ENABLE_SWAP_ON_WRITE)
      *ACE_reinterpret_cast(ACE_CDR::UShort*,buf) = *x;
      return 1;
#else
      if (!this->do_byte_swap_)
        {
          *ACE_reinterpret_cast (ACE_CDR::UShort *, buf) = *x;
          return 1;
        }
      else
        {
          ACE_CDR::swap_2 (ACE_reinterpret_cast (const char*, x), buf);
          return 1;
        }
#endif /* ACE_ENABLE_SWAP_ON_WRITE */
    }

  return 0;
}

ACE_CDR::Boolean
ACE_OutputCDR::write_4 (const ACE_CDR::ULong *x)
{
  char *buf;
  if (this->adjust (ACE_CDR::LONG_SIZE, buf) == 0)
    {
#if !defined (ACE_ENABLE_SWAP_ON_WRITE)
      *ACE_reinterpret_cast(ACE_CDR::ULong*,buf) = *x;
      return 1;
#else
      if (!this->do_byte_swap_)
        {
          *ACE_reinterpret_cast (ACE_CDR::ULong *, buf) = *x;
          return 1;
        }
      else
        {
          ACE_CDR::swap_4 (ACE_reinterpret_cast (const char*, x), buf);
          return 1;
        }
#endif /* ACE_ENABLE_SWAP_ON_WRITE */
    }

  return 0;
}

ACE_CDR::Boolean
ACE_OutputCDR::write_8 (const ACE_CDR::ULongLong *x)
{
  char *buf;
  if (this->adjust (ACE_CDR::LONGLONG_SIZE, buf) == 0)
    {
#if !defined (ACE_ENABLE_SWAP_ON_WRITE)
      *ACE_reinterpret_cast(ACE_CDR::ULongLong*,buf) = *x;
      return 1;
#else
      if (!this->do_byte_swap_)
        {
          *ACE_reinterpret_cast (ACE_CDR::ULongLong *, buf) = *x;
          return 1;
        }
      else
        {
          ACE_CDR::swap_8 (ACE_reinterpret_cast (const char*, x), buf);
          return 1;
        }
#endif /* ACE_ENABLE_SWAP_ON_WRITE */
    }

  return 0;
}

ACE_CDR::Boolean
ACE_OutputCDR::write_16 (const ACE_CDR::LongDouble *x)
{
  char* buf;
  if (this->adjust (ACE_CDR::LONGDOUBLE_SIZE,
                    ACE_CDR::LONGDOUBLE_ALIGN,
                    buf) == 0)
    {
#if !defined (ACE_ENABLE_SWAP_ON_WRITE)
      *ACE_reinterpret_cast(ACE_CDR::LongDouble*,buf) = *x;
      return 1;
#else
      if (!this->do_byte_swap_)
        {
          *ACE_reinterpret_cast (ACE_CDR::LongDouble *, buf) = *x;
          return 1;
        }
      else
        {
          ACE_CDR::swap_16 (ACE_reinterpret_cast (const char*, x), buf);
          return 1;
        }
#endif /* ACE_ENABLE_SWAP_ON_WRITE */
    }

  return 0;
}

ACE_CDR::Boolean
ACE_OutputCDR::write_array (const void *x,
                            size_t size,
                            size_t align,
                            ACE_CDR::ULong length)
{
  char *buf;
  if (this->adjust (size * length, align, buf) == 0)
    {
#if !defined (ACE_ENABLE_SWAP_ON_WRITE)
      ACE_OS::memcpy (buf, x, size*length);
      return 1;
#else
      if (!this->do_byte_swap_ || size == 1)
        {
          ACE_OS::memcpy (buf, x, size*length);
          return 1;
        }
      else
        {
          // I cannot see any fast way out of this....
          typedef void (*SWAPPER)(const char *, char *);
          SWAPPER swapper;
          switch (size)
            {
            case 2:
              swapper = ACE_CDR::swap_2;
              break;
            case 4:
              swapper = ACE_CDR::swap_4;
              break;
            case 8:
              swapper = ACE_CDR::swap_8;
              break;
            case 16:
              swapper = ACE_CDR::swap_16;
              break;
            default:
              // TODO: print something?
              this->good_bit_ = 0;
              return 0;
            }

          const char *source = ACE_reinterpret_cast (const char *, x);
          const char *end = source + size*length;

          for (; source != end; source += size, buf += size)
            {
              (*swapper)(source, buf);
            }

          return 1;
        }
#endif /* ACE_ENABLE_SWAP_ON_WRITE */
    }
  this->good_bit_ = 0;
  return 0;
}

ACE_CDR::Boolean
ACE_OutputCDR::write_boolean_array (const ACE_CDR::Boolean* x,
                                    ACE_CDR::ULong length)
{
  // It is hard to optimize this, the spec requires that on the wire
  // booleans be represented as a byte with value 0 or 1, but in
  // memoery it is possible (though very unlikely) that a boolean has
  // a non-zero value (different from 1).
  // We resort to a simple loop.
  const ACE_CDR::Boolean* end = x + length;
  for (const ACE_CDR::Boolean* i = x; i != end && this->good_bit (); ++i)
    {
      this->write_boolean (*i);
    }
  return this->good_bit ();
}

// ****************************************************************

ACE_InputCDR::ACE_InputCDR (const char *buf,
                            size_t bufsiz,
                            int byte_order)
  : start_ (buf, bufsiz),
    do_byte_swap_ (byte_order != ACE_CDR_BYTE_ORDER),
    good_bit_ (1),
    char_translator_ (0),
    wchar_translator_ (0)
{
  this->start_.wr_ptr (bufsiz);
}

ACE_InputCDR::ACE_InputCDR (size_t bufsiz,
                            int byte_order)
  : start_ (bufsiz),
    do_byte_swap_ (byte_order != ACE_CDR_BYTE_ORDER),
    good_bit_ (1),
    char_translator_ (0),
    wchar_translator_ (0)
{
}

ACE_InputCDR::ACE_InputCDR (const ACE_Message_Block *data,
                            int byte_order)
  : start_ (),
    good_bit_ (1),
    char_translator_ (0),
    wchar_translator_ (0)
{
  this->reset (data, byte_order);
}

ACE_InputCDR::ACE_InputCDR (ACE_Data_Block *data,
                            int byte_order)
  : start_ (data),
    do_byte_swap_ (byte_order != ACE_CDR_BYTE_ORDER),
    good_bit_ (1),
    char_translator_ (0),
    wchar_translator_ (0)
{
}

ACE_InputCDR::ACE_InputCDR (const ACE_InputCDR& rhs,
                            size_t size,
                            ACE_CDR::Long offset)
  : start_ (rhs.start_.data_block ()->duplicate ()),
    do_byte_swap_ (rhs.do_byte_swap_),
    good_bit_ (1),
    char_translator_ (0),
    wchar_translator_ (0)
{
  char* newpos = rhs.start_.rd_ptr() + offset;
  if (this->start_.base () <= newpos
      && newpos <= this->start_.end ()
      && newpos + size <= this->start_.end ())
    {
      this->start_.rd_ptr (newpos);
      this->start_.wr_ptr (newpos + size);
    }
  else
    {
      this->good_bit_ = 0;
    }
}

ACE_InputCDR::ACE_InputCDR (const ACE_InputCDR& rhs,
                            size_t size)
  : start_ (rhs.start_.data_block ()->duplicate ()),
    do_byte_swap_ (rhs.do_byte_swap_),
    good_bit_ (1),
    char_translator_ (0),
    wchar_translator_ (0)
{
  char* newpos = rhs.start_.rd_ptr();
  if (this->start_.base () <= newpos
      && newpos <= this->start_.end ()
      && newpos + size <= this->start_.end ())
    {
      // Notice that ACE_Message_Block::duplicate may leave the
      // wr_ptr() with a higher value that what we actually want.
      this->start_.rd_ptr (newpos);
      this->start_.wr_ptr (newpos + size);

      ACE_CDR::Octet byte_order;
      this->read_octet (byte_order);
      this->do_byte_swap_ = (byte_order != ACE_CDR_BYTE_ORDER);
    }
  else
    {
      this->good_bit_ = 0;
    }
}

ACE_InputCDR::ACE_InputCDR (const ACE_InputCDR& rhs)
  : start_ (rhs.start_.data_block ()->duplicate ()),
    do_byte_swap_ (rhs.do_byte_swap_),
    good_bit_ (1),
    char_translator_ (0),
    wchar_translator_ (0)
{
  this->start_.rd_ptr (rhs.start_.rd_ptr ());
  this->start_.wr_ptr (rhs.start_.wr_ptr ());
}

ACE_InputCDR&
ACE_InputCDR::operator= (const ACE_InputCDR& rhs)
{
  if (this != &rhs)
    {
      this->start_.data_block (rhs.start_.data_block ()->duplicate ());
      this->start_.rd_ptr (rhs.start_.rd_ptr ());
      this->start_.wr_ptr (rhs.start_.wr_ptr ());
      this->do_byte_swap_ = rhs.do_byte_swap_;
      this->good_bit_ = 1;
    }
  return *this;
}

ACE_InputCDR::ACE_InputCDR (const ACE_OutputCDR& rhs,
                            ACE_Allocator* buffer_allocator,
                            ACE_Allocator* data_block_allocator)
  : start_ (rhs.total_length () + ACE_CDR::MAX_ALIGNMENT,
            ACE_Message_Block::MB_DATA,
            0,
            0,
            buffer_allocator,
            0,
            0,
            ACE_Time_Value::zero,
            ACE_Time_Value::max_time,
            data_block_allocator),
    do_byte_swap_ (rhs.do_byte_swap_),
    good_bit_ (1),
    char_translator_ (0),
    wchar_translator_ (0)
{
  ACE_CDR::mb_align (&this->start_);
  for (const ACE_Message_Block *i = rhs.begin ();
       i != rhs.end ();
       i = i->cont ())
    this->start_.copy (i->rd_ptr (), i->length ());
}

ACE_CDR::Boolean
ACE_InputCDR::read_string (char *&x)
{
  // @@ This is a slight violation of "Optimize for the common case",
  // i.e. normally the translator will be 0, but OTOH the code is
  // smaller and should be better for the cache ;-) ;-)
  if (this->char_translator_ != 0)
    return this->char_translator_->read_string (*this, x);

  ACE_CDR::ULong len;

  this->read_ulong (len);
  if (len > 0)
    {
      ACE_NEW_RETURN (x,
                      ACE_CDR::Char[len],
                      0);
      if (this->read_char_array (x, len))
        return 1;
      delete [] x;
    }

  x = 0;
  return 0;
}

ACE_CDR::Boolean
ACE_InputCDR::read_string (ACE_CString &x)
{
  ACE_CDR::Char *data;
  if (this->read_string (data))
    {
      x = data;
      delete [] data;
      return 1;
    }

  x = "";
  return 0;
}

ACE_CDR::Boolean
ACE_InputCDR::read_wstring (ACE_CDR::WChar*& x)
{
  // @@ This is a slight violation of "Optimize for the common case",
  // i.e. normally the translator will be 0, but OTOH the code is
  // smaller and should be better for the cache ;-) ;-)
  if (this->wchar_translator_ != 0)
    return this->wchar_translator_->read_wstring (*this, x);

  ACE_CDR::ULong len;
  this->read_ulong (len);
  if (this->good_bit())
    {
      ACE_NEW_RETURN (x,
                      ACE_CDR::WChar[len],
                      0);
      if (this->read_wchar_array (x, len))
        return 1;

      delete [] x;
    }
  x = 0;
  return 0;
}

ACE_CDR::Boolean
ACE_InputCDR::read_array (void* x,
                          size_t size,
                          size_t align,
                          ACE_CDR::ULong length)
{
  char* buf;
  if (this->adjust (size * length, align, buf) == 0)
    {
#if !defined (ACE_DISABLE_SWAP_ON_READ)
      if (!this->do_byte_swap_ || size == 1)
        {
          ACE_OS::memcpy (x, buf, size*length);
        }
      else
        {
          // I cannot see any fast way out of this....
          char *target = ACE_reinterpret_cast (char*, x);
          char *end = target + size*length;
          switch (size)
            {
            case 2:
              for (; target != end; target += size, buf += size)
                {
                  ACE_CDR::swap_2 (buf, target);
                }
              break;
            case 4:
              for (; target != end; target += size, buf += size)
                {
                  ACE_CDR::swap_4 (buf, target);
                }
              break;
            case 8:
              for (; target != end; target += size, buf += size)
                {
                  ACE_CDR::swap_8 (buf, target);
                }
              break;
            case 16:
              for (; target != end; target += size, buf += size)
                {
                  ACE_CDR::swap_16 (buf, target);
                }
              break;
            default:
              // TODO: print something?
              this->good_bit_ = 0;
              return 0;
            }
        }
#else
      ACE_OS::memcpy (x, buf, size*length);
#endif /* ACE_DISABLE_SWAP_ON_READ */
      return this->good_bit_;
    }
  return 0;
}

ACE_CDR::Boolean
ACE_InputCDR::read_boolean_array (ACE_CDR::Boolean *x,
                                  ACE_CDR::ULong length)
{
  // It is hard to optimize this, the spec requires that on the wire
  // booleans be represented as a byte with value 0 or 1, but in
  // memoery it is possible (though very unlikely) that a boolean has
  // a non-zero value (different from 1).
  // We resort to a simple loop.
  for (ACE_CDR::ULong i = 0; i != length && this->good_bit_; ++i)
    {
      this->read_boolean (x[i]);
    }
  return this->good_bit_;
}

ACE_CDR::Boolean
ACE_InputCDR::read_1 (ACE_CDR::Octet *x)
{
  if (this->rd_ptr () < this->end ())
    {
      *x = *ACE_reinterpret_cast (ACE_CDR::Octet*,this->rd_ptr());
      this->start_.rd_ptr (1);
      return 1;
    }

  this->good_bit_ = 0;
  return 0;
}

ACE_CDR::Boolean
ACE_InputCDR::read_2 (ACE_CDR::UShort *x)
{
  char *buf;
  if (this->adjust (ACE_CDR::SHORT_SIZE, buf) == 0)
    {
#if !defined (ACE_DISABLE_SWAP_ON_READ)
      if (!this->do_byte_swap_)
        {
          *x = *ACE_reinterpret_cast (ACE_CDR::UShort*, buf);
        }
      else
        {
          ACE_CDR::swap_2 (buf, ACE_reinterpret_cast (char*, x));
        }
#else
      *x = *ACE_reinterpret_cast(ACE_CDR::UShort*,buf);
#endif /* ACE_DISABLE_SWAP_ON_READ */
      return 1;
    }
  return 0;
}

ACE_CDR::Boolean
ACE_InputCDR::read_4 (ACE_CDR::ULong *x)
{
  char *buf;
  if (this->adjust (ACE_CDR::LONG_SIZE, buf) == 0)
    {
#if !defined (ACE_DISABLE_SWAP_ON_READ)
      if (!this->do_byte_swap_)
        {
          *x = *ACE_reinterpret_cast (ACE_CDR::ULong*, buf);
        }
      else
        {
          ACE_CDR::swap_4 (buf, ACE_reinterpret_cast (char*, x));
        }
#else
      *x = *ACE_reinterpret_cast(ACE_CDR::ULong*,buf);
#endif /* ACE_DISABLE_SWAP_ON_READ */
      return 1;
    }
  return 0;
}

ACE_CDR::Boolean
ACE_InputCDR::read_8 (ACE_CDR::ULongLong *x)
{
  char *buf;
  if (this->adjust (ACE_CDR::LONGLONG_SIZE, buf) == 0)
    {
#if !defined (ACE_DISABLE_SWAP_ON_READ)
      if (!this->do_byte_swap_)
        {
          *x = *ACE_reinterpret_cast (ACE_CDR::ULongLong *, buf);
        }
      else
        {
          ACE_CDR::swap_8 (buf, ACE_reinterpret_cast (char*, x));
        }
#else
      *x = *ACE_reinterpret_cast(ACE_CDR::ULongLong*,buf);
#endif /* ACE_DISABLE_SWAP_ON_READ */
      return 1;
    }
  return 0;
}

ACE_CDR::Boolean
ACE_InputCDR::read_16 (ACE_CDR::LongDouble *x)
{
  char *buf;
  if (this->adjust (ACE_CDR::LONGLONG_SIZE,
                    ACE_CDR::LONGLONG_ALIGN,
                    buf) == 0)
    {
#if !defined (ACE_DISABLE_SWAP_ON_READ)
      if (!this->do_byte_swap_)
        {
          *x = *ACE_reinterpret_cast (ACE_CDR::LongDouble *, buf);
        }
      else
        {
          ACE_CDR::swap_16 (buf, ACE_reinterpret_cast (char*, x));
        }
#else
      *x = *ACE_reinterpret_cast(ACE_CDR::LongDouble*,buf);
#endif /* ACE_DISABLE_SWAP_ON_READ */
      return 1;
    }
  return 0;
}

ACE_CDR::Boolean
ACE_InputCDR::skip_string (void)
{
  ACE_CDR::ULong len;
  if (this->read_ulong (len))
    {
      if (this->rd_ptr () + len <= this->end ())
        {
          this->rd_ptr (len);
          return 1;
        }
      this->good_bit_ = 0;
    }

  return 0;
}

ACE_CDR::Boolean
ACE_InputCDR::skip_bytes (size_t len)
{
  if (this->rd_ptr () + len <= this->end ())
    {
      this->rd_ptr (len);
      return 1;
    }
  this->good_bit_ = 0;
  return 0;
}

int
ACE_InputCDR::grow (size_t newsize)
{
  if (ACE_CDR::grow (&this->start_, newsize) == -1)
    return -1;

  ACE_CDR::mb_align (&this->start_);
  this->start_.wr_ptr (newsize);
  return 0;
}

void
ACE_InputCDR::reset (const ACE_Message_Block* data,
                     int byte_order)
{
  this->reset_byte_order (byte_order);
  this->start_.size (ACE_CDR::total_length (data, 0)
                     + ACE_CDR::MAX_ALIGNMENT);

  // We must copy the contents of <data> into the new buffer, but
  // respecting the alignment.
  ptr_arith_t curalign =
    ptr_arith_t(data->rd_ptr ()) % ACE_CDR::MAX_ALIGNMENT;
  ptr_arith_t tmpalign =
    ptr_arith_t(this->start_.rd_ptr ()) % ACE_CDR::MAX_ALIGNMENT;
  int offset = curalign - tmpalign;
  if (offset < 0)
    offset += ACE_CDR::MAX_ALIGNMENT;
  this->start_.rd_ptr (offset);
  this->start_.wr_ptr (offset);

  for (const ACE_Message_Block* i = data;
       i != 0;
       i = i->cont ())
    {
      this->start_.copy (i->rd_ptr (), i->length ());
    }
}

void
ACE_InputCDR::steal_from (ACE_InputCDR &cdr)
{
  this->do_byte_swap_ = cdr.do_byte_swap_;
  this->start_.data_block (cdr.start_.data_block ()->duplicate ());
  this->start_.rd_ptr (cdr.start_.rd_ptr ());
  this->start_.wr_ptr (cdr.start_.wr_ptr ());

  cdr.reset_contents ();
}

ACE_Message_Block*
ACE_InputCDR::steal_contents (void)
{
  ACE_Message_Block* block =
    this->start_.clone ();
  this->start_.data_block (block->data_block ()->clone ());
  ACE_CDR::mb_align (&this->start_);

  return block;
}

void
ACE_InputCDR::reset_contents (void)
{
  this->start_.data_block (this->start_.data_block ()->clone ());
}