Logo Search packages:      
Sourcecode: poco version File versions  Download package

BinaryReader.cpp

//
// BinaryReader.cpp
//
// $Id: //poco/1.2/Foundation/src/BinaryReader.cpp#1 $
//
// Library: Foundation
// Package: Streams
// Module:  BinaryReaderWriter
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#include "Poco/BinaryReader.h"
#include "Poco/ByteOrder.h"


namespace Poco {


BinaryReader::BinaryReader(std::istream& istr, StreamByteOrder byteOrder):
      _istr(istr)
{
#if defined(POCO_ARCH_BIG_ENDIAN)
      _flipBytes = (byteOrder == LITTLE_ENDIAN_BYTE_ORDER);
#else
      _flipBytes = (byteOrder == BIG_ENDIAN_BYTE_ORDER);
#endif
}


00055 BinaryReader::~BinaryReader()
{
}


00060 BinaryReader& BinaryReader::operator >> (bool& value)
{
      _istr.read((char*) &value, sizeof(value));
      return *this;
}


BinaryReader& BinaryReader::operator >> (char& value)
{
      _istr.read((char*) &value, sizeof(value));
      return *this;
}


BinaryReader& BinaryReader::operator >> (unsigned char& value)
{
      _istr.read((char*) &value, sizeof(value));
      return *this;
}


BinaryReader& BinaryReader::operator >> (signed char& value)
{
      _istr.read((char*) &value, sizeof(value));
      return *this;
}


BinaryReader& BinaryReader::operator >> (short& value)
{
      _istr.read((char*) &value, sizeof(value));
      if (_flipBytes) value = ByteOrder::flipBytes(value);
      return *this;
}


BinaryReader& BinaryReader::operator >> (unsigned short& value)
{
      _istr.read((char*) &value, sizeof(value));
      if (_flipBytes) value = ByteOrder::flipBytes(value);
      return *this;
}


BinaryReader& BinaryReader::operator >> (int& value)
{
      _istr.read((char*) &value, sizeof(value));
      if (_flipBytes) value = ByteOrder::flipBytes(value);
      return *this;
}


BinaryReader& BinaryReader::operator >> (unsigned int& value)
{
      _istr.read((char*) &value, sizeof(value));
      if (_flipBytes) value = ByteOrder::flipBytes(value);
      return *this;
}


BinaryReader& BinaryReader::operator >> (long& value)
{
      _istr.read((char*) &value, sizeof(value));
#if defined(POCO_LONG_IS_64_BIT)
      if (_flipBytes) value = ByteOrder::flipBytes((Int64) value);
#else
      if (_flipBytes) value = ByteOrder::flipBytes((Int32) value);
#endif
      return *this;
}


BinaryReader& BinaryReader::operator >> (unsigned long& value)
{
      _istr.read((char*) &value, sizeof(value));
#if defined(POCO_LONG_IS_64_BIT)
      if (_flipBytes) value = ByteOrder::flipBytes((UInt64) value);
#else
      if (_flipBytes) value = ByteOrder::flipBytes((UInt32) value);
#endif
      return *this;
}


BinaryReader& BinaryReader::operator >> (float& value)
{
      if (_flipBytes)
      {
            char* ptr = (char*) &value;
            ptr += sizeof(value);
            for (unsigned i = 0; i < sizeof(value); ++i)
                  _istr.read(--ptr, 1);
      }
      else
      {
            _istr.read((char*) &value, sizeof(value));
      }
      return *this;
}


BinaryReader& BinaryReader::operator >> (double& value)
{
      if (_flipBytes)
      {
            char* ptr = (char*) &value;
            ptr += sizeof(value);
            for (unsigned i = 0; i < sizeof(value); ++i)
                  _istr.read(--ptr, 1);
      }
      else
      {
            _istr.read((char*) &value, sizeof(value));
      }
      return *this;
}


#if defined(POCO_HAVE_INT64) && !defined(POCO_LONG_IS_64_BIT)


BinaryReader& BinaryReader::operator >> (Int64& value)
{
      _istr.read((char*) &value, sizeof(value));
      if (_flipBytes) value = ByteOrder::flipBytes(value);
      return *this;
}


BinaryReader& BinaryReader::operator >> (UInt64& value)
{
      _istr.read((char*) &value, sizeof(value));
      if (_flipBytes) value = ByteOrder::flipBytes(value);
      return *this;
}


#endif


BinaryReader& BinaryReader::operator >> (std::string& value)
{
      UInt32 size = 0;
      read7BitEncoded(size);
      value.clear();
      value.reserve(size);
      while (size--)
      {
            char c;
            _istr.read(&c, 1);
            value += c;
      }
      return *this;
}


void BinaryReader::read7BitEncoded(UInt32& value)
{
      char c;
      value = 0;
      int s = 0;
      do
      {
            c = 0;
            _istr.read(&c, 1);
            UInt32 x = (c & 0x7F);
            x <<= s;
            value += x;
            s += 7;
      }
      while (c & 0x80);
}


#if defined(POCO_HAVE_INT64)


void BinaryReader::read7BitEncoded(UInt64& value)
{
      char c;
      value = 0;
      int s = 0;
      do
      {
            c = 0;
            _istr.read(&c, 1);
            UInt64 x = (c & 0x7F);
            x <<= s;
            value += x;
            s += 7;
      }
      while (c & 0x80);
}


#endif


00258 void BinaryReader::readRaw(int length, std::string& value)
{
      value.clear();
      value.reserve(length);
      while (length--)
      {
            char c;
            _istr.read(&c, 1);
            value += c;
      }
}


00271 void BinaryReader::readBOM()
{
      UInt16 bom;
      _istr.read((char*) &bom, sizeof(bom));
      _flipBytes = bom != 0xFEFF;
}


} // namespace Poco

Generated by  Doxygen 1.6.0   Back to index