mirror of
https://github.com/ClickHouse/ClickHouse.git
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258 lines
7.4 KiB
C++
258 lines
7.4 KiB
C++
//
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// BinaryWriter.h
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//
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// Library: Foundation
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// Package: Streams
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// Module: BinaryReaderWriter
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//
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// Definition of the BinaryWriter class.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef Foundation_BinaryWriter_INCLUDED
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#define Foundation_BinaryWriter_INCLUDED
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#include <ostream>
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#include <vector>
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#include "Poco/Buffer.h"
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#include "Poco/Foundation.h"
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#include "Poco/MemoryStream.h"
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namespace Poco
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{
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class TextEncoding;
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class TextConverter;
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class Foundation_API BinaryWriter
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/// This class writes basic types (and std::vectors of these)
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/// in binary form into an output stream.
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/// It provides an inserter-based interface similar to ostream.
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/// The writer also supports automatic conversion from big-endian
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/// (network byte order) to little-endian and vice-versa.
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/// Use a BinaryReader to read from a stream created by a BinaryWriter.
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/// Be careful when exchanging data between systems with different
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/// data type sizes (e.g., 32-bit and 64-bit architectures), as the sizes
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/// of some of the basic types may be different. For example, writing a
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/// long integer on a 64-bit system and reading it on a 32-bit system
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/// may yield an incorrect result. Use fixed-size types (Int32, Int64, etc.)
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/// in such a case.
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{
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public:
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enum StreamByteOrder
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{
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NATIVE_BYTE_ORDER = 1, /// the host's native byte-order
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BIG_ENDIAN_BYTE_ORDER = 2, /// big-endian (network) byte-order
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NETWORK_BYTE_ORDER = 2, /// big-endian (network) byte-order
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LITTLE_ENDIAN_BYTE_ORDER = 3 /// little-endian byte-order
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};
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static const std::streamsize DEFAULT_MAX_CSTR_LENGTH { 1024 };
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BinaryWriter(std::ostream & ostr, StreamByteOrder byteOrder = NATIVE_BYTE_ORDER);
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/// Creates the BinaryWriter.
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BinaryWriter(std::ostream & ostr, TextEncoding & encoding, StreamByteOrder byteOrder = NATIVE_BYTE_ORDER);
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/// Creates the BinaryWriter using the given TextEncoding.
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///
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/// Strings will be converted from the currently set global encoding
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/// (see Poco::TextEncoding::global()) to the specified encoding.
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~BinaryWriter();
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/// Destroys the BinaryWriter.
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BinaryWriter & operator<<(bool value);
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BinaryWriter & operator<<(char value);
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BinaryWriter & operator<<(unsigned char value);
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BinaryWriter & operator<<(signed char value);
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BinaryWriter & operator<<(short value);
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BinaryWriter & operator<<(unsigned short value);
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BinaryWriter & operator<<(int value);
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BinaryWriter & operator<<(unsigned int value);
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BinaryWriter & operator<<(long value);
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BinaryWriter & operator<<(unsigned long value);
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BinaryWriter & operator<<(float value);
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BinaryWriter & operator<<(double value);
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#if !defined(POCO_LONG_IS_64_BIT)
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BinaryWriter & operator<<(Int64 value);
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BinaryWriter & operator<<(UInt64 value);
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#endif
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BinaryWriter & operator<<(const std::string & value);
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BinaryWriter & operator<<(const char * value);
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template <typename T>
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BinaryWriter & operator<<(const std::vector<T> & value)
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{
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Poco::UInt32 size(static_cast<Poco::UInt32>(value.size()));
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*this << size;
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for (typename std::vector<T>::const_iterator it = value.begin(); it != value.end(); ++it)
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{
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*this << *it;
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}
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return *this;
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}
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void write7BitEncoded(UInt32 value);
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/// Writes a 32-bit unsigned integer in a compressed format.
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/// The value is written out seven bits at a time, starting
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/// with the seven least-significant bits.
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/// The high bit of a byte indicates whether there are more bytes to be
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/// written after this one.
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/// If value will fit in seven bits, it takes only one byte of space.
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/// If value will not fit in seven bits, the high bit is set on the first byte and
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/// written out. value is then shifted by seven bits and the next byte is written.
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/// This process is repeated until the entire integer has been written.
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void write7BitEncoded(UInt64 value);
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/// Writes a 64-bit unsigned integer in a compressed format.
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/// The value written out seven bits at a time, starting
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/// with the seven least-significant bits.
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/// The high bit of a byte indicates whether there are more bytes to be
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/// written after this one.
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/// If value will fit in seven bits, it takes only one byte of space.
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/// If value will not fit in seven bits, the high bit is set on the first byte and
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/// written out. value is then shifted by seven bits and the next byte is written.
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/// This process is repeated until the entire integer has been written.
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void writeRaw(const std::string & rawData);
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/// Writes the string as-is to the stream.
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void writeRaw(const char * buffer, std::streamsize length);
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/// Writes length raw bytes from the given buffer to the stream.
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void writeCString(const char* cString, std::streamsize maxLength = DEFAULT_MAX_CSTR_LENGTH);
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/// Writes zero-terminated C-string.
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void writeBOM();
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/// Writes a byte-order mark to the stream. A byte order mark is
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/// a 16-bit integer with a value of 0xFEFF, written in host byte-order.
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/// A BinaryReader uses the byte-order mark to determine the byte-order
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/// of the stream.
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void flush();
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/// Flushes the underlying stream.
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bool good();
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/// Returns _ostr.good();
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bool fail();
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/// Returns _ostr.fail();
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bool bad();
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/// Returns _ostr.bad();
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std::ostream & stream() const;
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/// Returns the underlying stream.
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StreamByteOrder byteOrder() const;
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/// Returns the byte ordering used by the writer, which is
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/// either BIG_ENDIAN_BYTE_ORDER or LITTLE_ENDIAN_BYTE_ORDER.
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private:
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std::ostream & _ostr;
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bool _flipBytes;
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TextConverter * _pTextConverter;
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};
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template <typename T>
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class BasicMemoryBinaryWriter : public BinaryWriter
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/// A convenient wrapper for using Buffer and MemoryStream with BinarWriter.
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{
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public:
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BasicMemoryBinaryWriter(Buffer<T> & data, StreamByteOrder byteOrder = NATIVE_BYTE_ORDER)
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: BinaryWriter(_ostr, byteOrder), _data(data), _ostr(data.begin(), data.capacity())
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{
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}
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BasicMemoryBinaryWriter(Buffer<T> & data, TextEncoding & encoding, StreamByteOrder byteOrder = NATIVE_BYTE_ORDER)
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: BinaryWriter(_ostr, encoding, byteOrder), _data(data), _ostr(data.begin(), data.capacity())
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{
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}
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~BasicMemoryBinaryWriter()
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{
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try
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{
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flush();
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}
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catch (...)
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{
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poco_unexpected();
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}
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}
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Buffer<T> & data() { return _data; }
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const Buffer<T> & data() const { return _data; }
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const MemoryOutputStream & stream() const { return _ostr; }
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MemoryOutputStream & stream() { return _ostr; }
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private:
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Buffer<T> & _data;
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MemoryOutputStream _ostr;
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};
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typedef BasicMemoryBinaryWriter<char> MemoryBinaryWriter;
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//
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// inlines
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//
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inline std::ostream & BinaryWriter::stream() const
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{
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return _ostr;
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}
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inline bool BinaryWriter::good()
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{
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return _ostr.good();
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}
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inline bool BinaryWriter::fail()
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{
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return _ostr.fail();
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}
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inline bool BinaryWriter::bad()
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{
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return _ostr.bad();
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}
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inline BinaryWriter::StreamByteOrder BinaryWriter::byteOrder() const
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{
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#if defined(POCO_ARCH_BIG_ENDIAN)
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return _flipBytes ? LITTLE_ENDIAN_BYTE_ORDER : BIG_ENDIAN_BYTE_ORDER;
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#else
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return _flipBytes ? BIG_ENDIAN_BYTE_ORDER : LITTLE_ENDIAN_BYTE_ORDER;
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#endif
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}
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} // namespace Poco
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#endif // Foundation_BinaryWriter_INCLUDED
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