binaryreader.cpp

This software aims to create an applet and panel tools to manage a wireless interface card, such as

//
// BinaryReader.cpp
//
// $Id: //poco/Main/Foundation/src/BinaryReader.cpp#5 $
//
// Copyright (c) 2004, Guenter Obiltschnig/Applied Informatics.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// 3. Redistributions in any form must be accompanied by information on
//    how to obtain complete source code for this software and any
//    accompanying software that uses this software.  The source code
//    must either be included in the distribution or be available for no
//    more than the cost of distribution plus a nominal fee, and must be
//    freely redistributable under reasonable conditions.  For an
//    executable file, complete source code means the source code for all
//    modules it contains.  It does not include source code for modules or
//    files that typically accompany the major components of the operating
//    system on which the executable file runs.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//


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


Foundation_BEGIN


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
}


BinaryReader::~BinaryReader()
{
}


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 (int 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 (int 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


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


void BinaryReader::readBOM()
{
	UInt32 bom;
	_istr.read((char*) &bom, sizeof(bom));
	_flipBytes = bom != 0xFEFF;
}


Foundation_END