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67 Zeilen
2.2 KiB
67 Zeilen
2.2 KiB
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namespace MiscUtil.Conversion
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{
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/// <summary>
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/// Implementation of EndianBitConverter which converts to/from big-endian
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/// byte arrays.
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/// </summary>
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public sealed class BigEndianBitConverter : EndianBitConverter
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{
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/// <summary>
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/// Indicates the byte order ("endianess") in which data is converted using this class.
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/// </summary>
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/// <remarks>
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/// Different computer architectures store data using different byte orders. "Big-endian"
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/// means the most significant byte is on the left end of a word. "Little-endian" means the
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/// most significant byte is on the right end of a word.
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/// </remarks>
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/// <returns>true if this converter is little-endian, false otherwise.</returns>
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public sealed override bool IsLittleEndian()
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{
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return false;
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}
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/// <summary>
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/// Indicates the byte order ("endianess") in which data is converted using this class.
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/// </summary>
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public sealed override Endianness Endianness
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{
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get { return Endianness.BigEndian; }
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}
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/// <summary>
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/// Copies the specified number of bytes from value to buffer, starting at index.
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/// </summary>
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/// <param name="value">The value to copy</param>
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/// <param name="bytes">The number of bytes to copy</param>
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/// <param name="buffer">The buffer to copy the bytes into</param>
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/// <param name="index">The index to start at</param>
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protected override void CopyBytesImpl(long value, int bytes, byte[] buffer, int index)
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{
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int endOffset = index+bytes-1;
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for (int i=0; i < bytes; i++)
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{
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buffer[endOffset-i] = unchecked((byte)(value&0xff));
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value = value >> 8;
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}
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}
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/// <summary>
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/// Returns a value built from the specified number of bytes from the given buffer,
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/// starting at index.
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/// </summary>
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/// <param name="buffer">The data in byte array format</param>
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/// <param name="startIndex">The first index to use</param>
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/// <param name="bytesToConvert">The number of bytes to use</param>
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/// <returns>The value built from the given bytes</returns>
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protected override long FromBytes(byte[] buffer, int startIndex, int bytesToConvert)
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{
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long ret = 0;
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for (int i=0; i < bytesToConvert; i++)
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{
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ret = unchecked((ret << 8) | buffer[startIndex+i]);
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}
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return ret;
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}
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}
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}
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