GoldenCrystal
46 lines
1.3 KiB
C#
46 lines
1.3 KiB
C#
using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace System.Unicode.Builder
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{
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internal static class BinaryWriterExtensions
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{
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/// <summary>Writes code point in a custom, but compact encoding.</summary>
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/// <remarks>
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/// Unlike UTF-8, this encoding will consume at most 3 bytes.
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/// It could ideally store values between 0x0 and 0x40409F, but this range is useless at the moment.
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/// </remarks>
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/// <param name="writer">The binary writer to use.</param>
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/// <param name="value">The value to write</param>
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public static void WriteCodePoint(this BinaryWriter writer, int value)
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{
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if (value < 0 || value > 0x40407F) throw new ArgumentOutOfRangeException("value");
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if (value < 0xA0) writer.Write((byte)value);
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else if (value < 0x20A0)
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{
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value -= 0xA0;
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writer.Write((byte)((byte)(value >> 8) | 0xA0));
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writer.Write((byte)value);
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}
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else if (value < 0x40A0)
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{
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value -= 0x20A0;
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writer.Write((byte)((byte)(value >> 8) | 0xC0));
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writer.Write((byte)value);
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}
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else
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{
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value -= 0x40A0;
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writer.Write((byte)((byte)(value >> 16) | 0xE0));
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writer.Write((byte)(value >> 8));
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writer.Write((byte)value);
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}
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}
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}
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}
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