81 lines
2.3 KiB
C#
81 lines
2.3 KiB
C#
namespace Qrakhen.Qamp.Memory;
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// add to qrakhen.memory package for clout
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public abstract class TailBuffer<T>
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{
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private T[] _data;
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public T[] Data {
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get => _data;
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}
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public int Capacity => _data.Length;
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public int Tail { get; private set; }
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public TailBuffer(int size = 0x80)
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{
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_data = new T[size];
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}
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public TailBuffer(T[] data)
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{
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_data = new T[data.Length * 2];
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Array.Copy(data, 0, _data, 0, data.Length);
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SetTail(data.Length);
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}
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public void Insert(int cursor, T[] data)
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{
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cursor = SeekTail(cursor);
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Prepare(cursor, data.Length);
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int length = data.Length;
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if (cursor == Tail) {
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// Just append here.
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Array.Copy(data, 0, _data, cursor, length);
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SetTail(cursor + length);
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} else {
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// Shift everything to the right of insertion
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Array.Copy(_data, cursor, _data, cursor + length, Tail - cursor);
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Array.Copy(data, 0, _data, cursor, length);
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SetTail(Tail + length);
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}
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}
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public void Delete(Range range)
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=> Delete(range.From, range.To - range.From);
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public void Delete(int cursor, int count)
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{
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if (cursor + count >= Tail)
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SetTail(cursor); // Directly terminate at cursor, nothing is behind tail.
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else {
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// Move everything from end of deletion until tail to start of deletion.
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Array.Copy(_data, cursor + count, _data, cursor, Tail - (cursor + count));
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SetTail(Tail - count);
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}
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}
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// never write beyond tail (there might be invalid data)
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private int SeekTail(int cursor) => cursor > Tail ? Tail : cursor;
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private void Prepare(int index, int count)
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{
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ArgumentOutOfRangeException.ThrowIfNegative(index);
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if (count + Tail <= _data.Length)
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return;
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while (count + Tail > _data.Length) {
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T[] grow = new T[_data.Length * 2];
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Array.Copy(_data, grow, _data.Length);
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_data = grow;
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}
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}
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/// <summary>
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/// Sets the tail, or, if omitted, seeks the tail by finding the first null terminator.
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/// </summary>
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/// <param name="tail"></param>
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protected virtual void SetTail(int tail = -1)
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{
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Tail = tail;
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}
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}
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