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392 lines
10 KiB
392 lines
10 KiB
using System;
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using System.IO;
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using System.Text;
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using MiscUtil.Conversion;
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namespace MiscUtil.IO
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{
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/// <summary>
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/// Equivalent of System.IO.BinaryWriter, but with either endianness, depending on
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/// the EndianBitConverter it is constructed with.
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/// </summary>
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public class EndianBinaryWriter : IDisposable
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{
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#region Fields not directly related to properties
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/// <summary>
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/// Whether or not this writer has been disposed yet.
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/// </summary>
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bool disposed=false;
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/// <summary>
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/// Buffer used for temporary storage during conversion from primitives
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/// </summary>
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byte[] buffer = new byte[16];
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/// <summary>
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/// Buffer used for Write(char)
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/// </summary>
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char[] charBuffer = new char[1];
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#endregion
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#region Constructors
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/// <summary>
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/// Constructs a new binary writer with the given bit converter, writing
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/// to the given stream, using UTF-8 encoding.
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/// </summary>
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/// <param name="bitConverter">Converter to use when writing data</param>
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/// <param name="stream">Stream to write data to</param>
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public EndianBinaryWriter (EndianBitConverter bitConverter,
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Stream stream) : this (bitConverter, stream, Encoding.UTF8)
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{
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}
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/// <summary>
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/// Constructs a new binary writer with the given bit converter, writing
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/// to the given stream, using the given encoding.
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/// </summary>
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/// <param name="bitConverter">Converter to use when writing data</param>
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/// <param name="stream">Stream to write data to</param>
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/// <param name="encoding">Encoding to use when writing character data</param>
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public EndianBinaryWriter (EndianBitConverter bitConverter, Stream stream, Encoding encoding)
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{
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if (bitConverter==null)
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{
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throw new ArgumentNullException("bitConverter");
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}
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if (stream==null)
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{
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throw new ArgumentNullException("stream");
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}
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if (encoding==null)
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{
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throw new ArgumentNullException("encoding");
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}
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if (!stream.CanWrite)
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{
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throw new ArgumentException("Stream isn't writable", "stream");
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}
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this.stream = stream;
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this.bitConverter = bitConverter;
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this.encoding = encoding;
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}
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#endregion
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#region Properties
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EndianBitConverter bitConverter;
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/// <summary>
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/// The bit converter used to write values to the stream
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/// </summary>
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public EndianBitConverter BitConverter
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{
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get { return bitConverter; }
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}
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Encoding encoding;
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/// <summary>
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/// The encoding used to write strings
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/// </summary>
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public Encoding Encoding
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{
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get { return encoding; }
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}
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Stream stream;
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/// <summary>
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/// Gets the underlying stream of the EndianBinaryWriter.
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/// </summary>
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public Stream BaseStream
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{
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get { return stream; }
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}
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#endregion
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#region Public methods
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/// <summary>
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/// Closes the writer, including the underlying stream.
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/// </summary>
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public void Close()
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{
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Dispose();
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}
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/// <summary>
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/// Flushes the underlying stream.
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/// </summary>
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public void Flush()
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{
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CheckDisposed();
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stream.Flush();
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}
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/// <summary>
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/// Seeks within the stream.
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/// </summary>
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/// <param name="offset">Offset to seek to.</param>
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/// <param name="origin">Origin of seek operation.</param>
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public void Seek (int offset, SeekOrigin origin)
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{
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CheckDisposed();
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stream.Seek (offset, origin);
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}
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/// <summary>
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/// Writes a boolean value to the stream. 1 byte is written.
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/// </summary>
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/// <param name="value">The value to write</param>
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public void Write (bool value)
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{
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bitConverter.CopyBytes(value, buffer, 0);
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WriteInternal(buffer, 1);
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}
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/// <summary>
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/// Writes a 16-bit signed integer to the stream, using the bit converter
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/// for this writer. 2 bytes are written.
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/// </summary>
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/// <param name="value">The value to write</param>
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public void Write (short value)
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{
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bitConverter.CopyBytes(value, buffer, 0);
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WriteInternal(buffer, 2);
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}
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/// <summary>
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/// Writes a 32-bit signed integer to the stream, using the bit converter
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/// for this writer. 4 bytes are written.
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/// </summary>
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/// <param name="value">The value to write</param>
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public void Write (int value)
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{
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bitConverter.CopyBytes(value, buffer, 0);
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WriteInternal(buffer, 4);
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}
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/// <summary>
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/// Writes a 64-bit signed integer to the stream, using the bit converter
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/// for this writer. 8 bytes are written.
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/// </summary>
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/// <param name="value">The value to write</param>
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public void Write (long value)
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{
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bitConverter.CopyBytes(value, buffer, 0);
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WriteInternal(buffer, 8);
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}
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/// <summary>
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/// Writes a 16-bit unsigned integer to the stream, using the bit converter
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/// for this writer. 2 bytes are written.
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/// </summary>
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/// <param name="value">The value to write</param>
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public void Write (ushort value)
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{
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bitConverter.CopyBytes(value, buffer, 0);
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WriteInternal(buffer, 2);
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}
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/// <summary>
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/// Writes a 32-bit unsigned integer to the stream, using the bit converter
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/// for this writer. 4 bytes are written.
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/// </summary>
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/// <param name="value">The value to write</param>
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public void Write (uint value)
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{
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bitConverter.CopyBytes(value, buffer, 0);
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WriteInternal(buffer, 4);
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}
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/// <summary>
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/// Writes a 64-bit unsigned integer to the stream, using the bit converter
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/// for this writer. 8 bytes are written.
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/// </summary>
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/// <param name="value">The value to write</param>
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public void Write (ulong value)
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{
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bitConverter.CopyBytes(value, buffer, 0);
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WriteInternal(buffer, 8);
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}
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/// <summary>
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/// Writes a single-precision floating-point value to the stream, using the bit converter
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/// for this writer. 4 bytes are written.
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/// </summary>
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/// <param name="value">The value to write</param>
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public void Write (float value)
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{
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bitConverter.CopyBytes(value, buffer, 0);
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WriteInternal(buffer, 4);
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}
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/// <summary>
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/// Writes a double-precision floating-point value to the stream, using the bit converter
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/// for this writer. 8 bytes are written.
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/// </summary>
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/// <param name="value">The value to write</param>
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public void Write (double value)
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{
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bitConverter.CopyBytes(value, buffer, 0);
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WriteInternal(buffer, 8);
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}
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/// <summary>
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/// Writes a decimal value to the stream, using the bit converter for this writer.
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/// 16 bytes are written.
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/// </summary>
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/// <param name="value">The value to write</param>
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public void Write (decimal value)
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{
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bitConverter.CopyBytes(value, buffer, 0);
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WriteInternal(buffer, 16);
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}
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/// <summary>
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/// Writes a signed byte to the stream.
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/// </summary>
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/// <param name="value">The value to write</param>
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public void Write (byte value)
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{
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buffer[0] = value;
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WriteInternal(buffer, 1);
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}
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/// <summary>
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/// Writes an unsigned byte to the stream.
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/// </summary>
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/// <param name="value">The value to write</param>
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public void Write (sbyte value)
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{
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buffer[0] = unchecked((byte)value);
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WriteInternal(buffer, 1);
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}
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/// <summary>
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/// Writes an array of bytes to the stream.
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/// </summary>
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/// <param name="value">The values to write</param>
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public void Write (byte[] value)
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{
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if (value == null)
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{
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throw (new System.ArgumentNullException("value"));
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}
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WriteInternal(value, value.Length);
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}
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/// <summary>
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/// Writes a portion of an array of bytes to the stream.
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/// </summary>
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/// <param name="value">An array containing the bytes to write</param>
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/// <param name="offset">The index of the first byte to write within the array</param>
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/// <param name="count">The number of bytes to write</param>
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public void Write (byte[] value, int offset, int count)
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{
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CheckDisposed();
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stream.Write(value, offset, count);
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}
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/// <summary>
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/// Writes a single character to the stream, using the encoding for this writer.
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/// </summary>
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/// <param name="value">The value to write</param>
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public void Write(char value)
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{
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charBuffer[0] = value;
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Write(charBuffer);
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}
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/// <summary>
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/// Writes an array of characters to the stream, using the encoding for this writer.
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/// </summary>
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/// <param name="value">An array containing the characters to write</param>
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public void Write(char[] value)
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{
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if (value==null)
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{
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throw new ArgumentNullException("value");
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}
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CheckDisposed();
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byte[] data = Encoding.GetBytes(value, 0, value.Length);
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WriteInternal(data, data.Length);
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}
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/// <summary>
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/// Writes a string to the stream, using the encoding for this writer.
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/// </summary>
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/// <param name="value">The value to write. Must not be null.</param>
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/// <exception cref="ArgumentNullException">value is null</exception>
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public void Write(string value)
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{
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if (value==null)
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{
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throw new ArgumentNullException("value");
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}
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CheckDisposed();
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byte[] data = Encoding.GetBytes(value);
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Write7BitEncodedInt(data.Length);
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WriteInternal(data, data.Length);
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}
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/// <summary>
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/// Writes a 7-bit encoded integer from the stream. This is stored with the least significant
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/// information first, with 7 bits of information per byte of value, and the top
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/// bit as a continuation flag.
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/// </summary>
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/// <param name="value">The 7-bit encoded integer to write to the stream</param>
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public void Write7BitEncodedInt(int value)
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{
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CheckDisposed();
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if (value < 0)
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{
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throw new ArgumentOutOfRangeException("value", "Value must be greater than or equal to 0.");
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}
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int index=0;
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while (value >= 128)
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{
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buffer[index++]= (byte)((value&0x7f) | 0x80);
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value = value >> 7;
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index++;
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}
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buffer[index++]=(byte)value;
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stream.Write(buffer, 0, index);
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}
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#endregion
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#region Private methods
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/// <summary>
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/// Checks whether or not the writer has been disposed, throwing an exception if so.
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/// </summary>
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void CheckDisposed()
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{
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if (disposed)
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{
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throw new ObjectDisposedException("EndianBinaryWriter");
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}
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}
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/// <summary>
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/// Writes the specified number of bytes from the start of the given byte array,
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/// after checking whether or not the writer has been disposed.
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/// </summary>
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/// <param name="bytes">The array of bytes to write from</param>
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/// <param name="length">The number of bytes to write</param>
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void WriteInternal (byte[] bytes, int length)
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{
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CheckDisposed();
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stream.Write(bytes, 0, length);
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}
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#endregion
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#region IDisposable Members
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/// <summary>
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/// Disposes of the underlying stream.
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/// </summary>
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public void Dispose()
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{
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if (!disposed)
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{
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Flush();
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disposed = true;
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((IDisposable)stream).Dispose();
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}
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}
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#endregion
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}
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}
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