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BitWriter.cs
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BitWriter.cs
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/* Copyright (c) 2019 Rick (rick 'at' gibbed 'dot' us)
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would
* be appreciated but is not required.
*
* 2. Altered source versions must be plainly marked as such, and must not
* be misrepresented as being the original software.
*
* 3. This notice may not be removed or altered from any source
* distribution.
*/
using System;
namespace IOTools {
public class BitWriter {
private byte[] _Buffer;
public override string ToString() {
return Converters.BytesToBitString(GetBuffer());
}
public int AllocatedLength {
get { return this._Buffer.Length * 8; }
}
public int Position { get; set; }
public BitWriter() {
this._Buffer = new byte[0];
this.Position = 0;
}
private void Resize(int newSize) {
var start = this._Buffer.Length;
Array.Resize(ref this._Buffer, newSize);
if (newSize > start) {
for (int i = start; i < this._Buffer.Length; i++) {
this._Buffer[i] = 0x0;
}
}
}
public byte[] GetBuffer() {
var length = (this.Position + 7) >> 3;
var buffer = new byte[length];
Array.Copy(this._Buffer, buffer, length);
return buffer;
}
public void WriteInt16(short value, int bits) {
if (bits < 0 || bits > 16) {
throw new ArgumentOutOfRangeException(nameof(bits));
}
this.WriteUInt32((uint)value, bits);
}
public void WriteUInt16(ushort value, int bits) {
if (bits < 0 || bits > 16) {
throw new ArgumentOutOfRangeException(nameof(bits));
}
this.WriteUInt32(value, bits);
}
public void WriteInt32(int value, int bits) {
this.WriteUInt32((uint)value, bits);
}
public void WriteUInt32(uint value, int bits) {
if (bits < 0 || bits > 32) {
throw new ArgumentOutOfRangeException(nameof(bits));
}
while (bits > 0) {
if (this.Position >= this.AllocatedLength) {
this.Resize(128);
}
int offset = this.Position % 8;
int left = Math.Min(8 - offset, bits);
uint mask = (1u << left) - 1;
this._Buffer[this.Position >> 3] &= (byte)(~(mask << offset));
this._Buffer[this.Position >> 3] |= (byte)((value & mask) << offset);
bits -= left;
value >>= left;
this.Position += left;
}
}
public void WriteInt64(long value, int bits) {
this.WriteUInt64((ulong)value, bits);
}
public void WriteUInt64(ulong value, int bits) {
if (bits < 0 || bits > 64) {
throw new ArgumentOutOfRangeException(nameof(bits));
}
while (bits > 0) {
if (this.Position >= this.AllocatedLength) {
Array.Resize(ref this._Buffer, this._Buffer.Length + 128);
}
int offset = this.Position % 8;
int left = Math.Min(8 - offset, bits);
ulong mask = (1ul << left) - 1;
this._Buffer[this.Position >> 3] |= (byte)((value & mask) << offset);
bits -= left;
value >>= left;
this.Position += left;
}
}
public void WriteBoolean(bool value) {
this.WriteUInt32(value == true ? 1u : 0u, 1);
}
}
}