poco/Foundation/include/Poco/BinaryWriter.h

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//
// BinaryWriter.h
//
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// $Id: //poco/1.2/Foundation/include/Poco/BinaryWriter.h#1 $
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//
// Library: Foundation
// Package: Streams
// Module: BinaryReaderWriter
//
// Definition of the BinaryWriter class.
//
// 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.
//
#ifndef Foundation_BinaryWriter_INCLUDED
#define Foundation_BinaryWriter_INCLUDED
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#include "Poco/Foundation.h"
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#include <ostream>
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namespace Poco {
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class Foundation_API BinaryWriter
/// This class writes basic types in binary form into an output stream.
/// It provides an inserter-based interface similar to ostream.
/// The writer also supports automatic conversion from big-endian
/// (network byte order) to little-endian and vice-versa.
/// Use a BinaryReader to read from a stream created by a BinaryWriter.
/// Be careful when exchanging data between systems with different
/// data type sizes (e.g., 32-bit and 64-bit architectures), as the sizes
/// of some of the basic types may be different. For example, writing a
/// long integer on a 64-bit system and reading it on a 32-bit system
/// may yield an incorrent result. Use fixed-size types (Int32, Int64, etc.)
/// in such a case.
{
public:
enum StreamByteOrder
{
NATIVE_BYTE_ORDER = 1, /// the host's native byte-order
BIG_ENDIAN_BYTE_ORDER = 2, /// big-endian (network) byte-order
NETWORK_BYTE_ORDER = 2, /// big-endian (network) byte-order
LITTLE_ENDIAN_BYTE_ORDER = 3 /// little-endian byte-order
};
BinaryWriter(std::ostream& ostr, StreamByteOrder byteOrder = NATIVE_BYTE_ORDER);
/// Creates the BinaryWriter.
~BinaryWriter();
/// Destroys the BinaryWriter.
BinaryWriter& operator << (bool value);
BinaryWriter& operator << (char value);
BinaryWriter& operator << (unsigned char value);
BinaryWriter& operator << (signed char value);
BinaryWriter& operator << (short value);
BinaryWriter& operator << (unsigned short value);
BinaryWriter& operator << (int value);
BinaryWriter& operator << (unsigned int value);
BinaryWriter& operator << (long value);
BinaryWriter& operator << (unsigned long value);
BinaryWriter& operator << (float value);
BinaryWriter& operator << (double value);
#if defined(POCO_HAVE_INT64) && !defined(POCO_LONG_IS_64_BIT)
BinaryWriter& operator << (Int64 value);
BinaryWriter& operator << (UInt64 value);
#endif
BinaryWriter& operator << (const std::string& value);
BinaryWriter& operator << (const char* value);
void write7BitEncoded(UInt32 value);
/// Writes a 32-bit unsigned integer in a compressed format.
/// The value is written out seven bits at a time, starting
/// with the seven least-significant bits.
/// The high bit of a byte indicates whether there are more bytes to be
/// written after this one.
/// If value will fit in seven bits, it takes only one byte of space.
/// If value will not fit in seven bits, the high bit is set on the first byte and
/// written out. value is then shifted by seven bits and the next byte is written.
/// This process is repeated until the entire integer has been written.
#if defined(POCO_HAVE_INT64)
void write7BitEncoded(UInt64 value);
/// Writes a 64-bit unsigned integer in a compressed format.
/// The value written out seven bits at a time, starting
/// with the seven least-significant bits.
/// The high bit of a byte indicates whether there are more bytes to be
/// written after this one.
/// If value will fit in seven bits, it takes only one byte of space.
/// If value will not fit in seven bits, the high bit is set on the first byte and
/// written out. value is then shifted by seven bits and the next byte is written.
/// This process is repeated until the entire integer has been written.
#endif
void writeRaw(const std::string& rawData);
/// Writes the string as-is to the stream.
void writeBOM();
/// Writes a byte-order mark to the stream. A byte order mark is
/// a 16-bit integer with a value of 0xFEFF, written in host byte-order.
/// A BinaryReader uses the byte-order mark to determine the byte-order
/// of the stream.
void flush();
/// Flushes the underlying stream.
bool good();
/// Returns _ostr.good();
bool fail();
/// Returns _ostr.fail();
bool bad();
/// Returns _ostr.bad();
std::ostream& stream() const;
/// Returns the underlying stream.
StreamByteOrder byteOrder() const;
/// Returns the byte ordering used by the writer, which is
/// either BIG_ENDIAN_BYTE_ORDER or LITTLE_ENDIAN_BYTE_ORDER.
private:
std::ostream& _ostr;
bool _flipBytes;
};
//
// inlines
//
inline std::ostream& BinaryWriter::stream() const
{
return _ostr;
}
inline bool BinaryWriter::good()
{
return _ostr.good();
}
inline bool BinaryWriter::fail()
{
return _ostr.fail();
}
inline bool BinaryWriter::bad()
{
return _ostr.bad();
}
inline BinaryWriter::StreamByteOrder BinaryWriter::byteOrder() const
{
#if defined(POCO_ARCH_BIG_ENDIAN)
return _flipBytes ? LITTLE_ENDIAN_BYTE_ORDER : BIG_ENDIAN_BYTE_ORDER;
#else
return _flipBytes ? BIG_ENDIAN_BYTE_ORDER : LITTLE_ENDIAN_BYTE_ORDER;
#endif
}
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} // namespace Poco
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#endif // Foundation_BinaryWriter_INCLUDED