1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295using System;
using System.Collections.Generic;
using System.Text;
using Xtremegaida.DataStructures;

namespace MediaContainers;

public abstract class EBMLElement
{
	public readonly EBMLElementDefiniton Definition;
	public readonly EBMLVInt DataSize;
	public readonly long DataOffset;
	protected EBMLMasterElement parent;

	public virtual EBMLElementType ElementType => Definition.Type;

	public virtual long IntValue => 0;
	public virtual ulong UIntValue => 0;
	public virtual float FloatValue => 0;
	public virtual double DoubleValue => 0;
	public virtual string StringValue => "<UNKNOWN>";
	public virtual DateTime? DateValue => null;

	public EBMLElement Parent => parent;
	public virtual EBMLElement[] Children => Array.Empty<EBMLElement>();
	public virtual bool IsFullyRead => true;

	protected EBMLElement(EBMLElementDefiniton def, EBMLVInt dataSize, long offset)
	{
		Definition = def;
		DataSize = dataSize;
		DataOffset = offset;
	}

	internal void SetParent(EBMLMasterElement parent) { this.parent = parent; }

	public override string ToString()
	{
		return Definition.FullPath + ":" + StringValue +
		   (DataOffset < 0 ? " (?" : (" (0x" + Convert.ToString(DataOffset, 16))) + ":" +
		   (DataSize.IsUnknownValue ? "?" : ("0x" + Convert.ToString((long)DataSize.Value, 16))) + ")";
	}
}

public sealed class EBMLSignedIntegerElement : EBMLElement
{
	public readonly long Value;

	public override long IntValue => Value;
	public override ulong UIntValue => (ulong)Value;
	public override float FloatValue => Value;
	public override double DoubleValue => Value;
	public override string StringValue => Value.ToString();

	public EBMLSignedIntegerElement(EBMLElementDefiniton def, EBMLVInt dataSize, long offset, long value)
	   : base(def, dataSize, offset)
	{
		if (def.Type != EBMLElementType.SignedInteger) { throw new ArgumentException("Type mismatch", nameof(def)); }
		if (dataSize.Value > 8) { throw new ArgumentOutOfRangeException(nameof(dataSize)); }
		Value = value;
	}

	public EBMLSignedIntegerElement(EBMLElementDefiniton def, long value)
	   : this(def, new EBMLVInt((ulong)EBMLWriter.CalculateWidth(value)), -1, value) { }
}

public sealed class EBMLUnsignedIntegerElement : EBMLElement
{
	public readonly ulong Value;

	public override long IntValue => (long)Value;
	public override ulong UIntValue => Value;
	public override float FloatValue => Value;
	public override double DoubleValue => Value;
	public override string StringValue => Value.ToString();

	public EBMLUnsignedIntegerElement(EBMLElementDefiniton def, EBMLVInt dataSize, long offset, ulong value)
	   : base(def, dataSize, offset)
	{
		if (def.Type != EBMLElementType.UnsignedInteger) { throw new ArgumentException("Type mismatch", nameof(def)); }
		if (dataSize.Value > 8) { throw new ArgumentOutOfRangeException(nameof(dataSize)); }
		Value = value;
	}

	public EBMLUnsignedIntegerElement(EBMLElementDefiniton def, ulong value)
	   : this(def, new EBMLVInt((ulong)EBMLWriter.CalculateWidth(value)), -1, value) { }
}

public sealed class EBMLFloatElement : EBMLElement
{
	public readonly double Value64;
	public readonly float Value32;

	public override long IntValue => (long)Value64;
	public override ulong UIntValue => (ulong)Value64;
	public override float FloatValue => Value32;
	public override double DoubleValue => Value64;
	public override string StringValue => Value64.ToString();

	public EBMLFloatElement(EBMLElementDefiniton def, EBMLVInt dataSize, long offset, double value)
	   : base(def, dataSize, offset)
	{
		if (def.Type != EBMLElementType.Float) { throw new ArgumentException("Type mismatch", nameof(def)); }
		if (dataSize.Value != 0 && dataSize.Value != 8) { throw new ArgumentOutOfRangeException(nameof(dataSize)); }
		Value64 = value; Value32 = (float)value;
	}

	public EBMLFloatElement(EBMLElementDefiniton def, EBMLVInt dataSize, long offset, float value)
	   : base(def, dataSize, offset)
	{
		if (dataSize.Value != 0 && dataSize.Value != 4) { throw new ArgumentOutOfRangeException(nameof(dataSize)); }
		Value64 = value; Value32 = value;
	}

	public EBMLFloatElement(EBMLElementDefiniton def, double value)
	   : this(def, new EBMLVInt(8), -1, value) { }

	public EBMLFloatElement(EBMLElementDefiniton def, float value)
	   : this(def, new EBMLVInt(4), -1, value) { }
}

public sealed class EBMLStringElement : EBMLElement
{
	public readonly string Value;

	public override EBMLElementType ElementType => EBMLElementType.String;
	public override long IntValue { get { _ = long.TryParse(Value, out var i); return i; } }
	public override ulong UIntValue { get { _ = ulong.TryParse(Value, out var i); return i; } }
	public override float FloatValue { get { _ = float.TryParse(Value, out var i); return i; } }
	public override double DoubleValue { get { _ = double.TryParse(Value, out var i); return i; } }
	public override string StringValue => Value;
	public override DateTime? DateValue { get { if (DateTime.TryParse(Value, out var i)) { return i; } return null; } }

	public EBMLStringElement(EBMLElementDefiniton def, EBMLVInt dataSize, long offset, string value)
	   : base(def, dataSize, offset)
	{
		if (def.Type != EBMLElementType.String && def.Type != EBMLElementType.UTF8) { throw new ArgumentException("Type mismatch", nameof(def)); }
		Value = value;
	}

	public EBMLStringElement(EBMLElementDefiniton def, string str)
	   : this(def, new EBMLVInt((ulong)str.Length), -1, str) { }
}

public sealed class EBMLDateElement : EBMLElement
{
	public static readonly DateTime Epoch = new DateTime(2001, 1, 1, 0, 0, 0, DateTimeKind.Utc);

	public readonly DateTime Value;

	public override string StringValue => Value.ToString();
	public override DateTime? DateValue => Value;

	public EBMLDateElement(EBMLElementDefiniton def, EBMLVInt dataSize, long offset, DateTime value)
	   : base(def, dataSize, offset)
	{
		if (def.Type != EBMLElementType.Date) { throw new ArgumentException("Type mismatch", nameof(def)); }
		if (dataSize.Value != 8 && (dataSize.Value != 0 || value != Epoch)) { throw new ArgumentOutOfRangeException(nameof(dataSize)); }
		Value = value;
	}

	public EBMLDateElement(EBMLElementDefiniton def, DateTime value)
	   : this(def, new EBMLVInt(8), -1, value) { }
}

public sealed class EBMLBinaryElement : EBMLElement
{
	public readonly ReadOnlyMemory<byte> Value;

	private readonly IDataQueueReader reader;

	public IDataQueueReader Reader => reader;
	public override string StringValue => "<BINARY>";
	public override bool IsFullyRead => reader?.IsReadClosed ?? true;

	public EBMLBinaryElement(EBMLElementDefiniton def, EBMLVInt dataSize, long offset, ReadOnlyMemory<byte> value)
	   : base(def, dataSize, offset)
	{
		if (def.Type != EBMLElementType.Binary && def.Type != EBMLElementType.Unknown) { throw new ArgumentException("Type mismatch", nameof(def)); }
		if ((int)dataSize.Value > value.Length) { throw new ArgumentOutOfRangeException(nameof(dataSize)); }
		if ((int)dataSize.Value < value.Length) { value = value.Slice(0, (int)dataSize.Value); }
		Value = value;
	}

	public EBMLBinaryElement(EBMLElementDefiniton def, EBMLVInt dataSize, long offset, IDataQueueReader reader, bool encapsulated = false)
	   : base(def, dataSize, offset)
	{
		if (def.Type != EBMLElementType.Binary) { throw new ArgumentException("Type mismatch", nameof(def)); }
		if (encapsulated) { this.reader = reader; }
		else { this.reader = new DataQueueLimitedReader(reader, (long)dataSize.Value, true); }
	}

	public EBMLBinaryElement(EBMLElementDefiniton def, ReadOnlyMemory<byte> value)
	   : this(def, new EBMLVInt((ulong)value.Length), -1, value) { }
}

public sealed class EBMLVoidElement : EBMLElement
{
	private readonly IDataQueueReader reader;

	public IDataQueueReader Reader => reader;
	public override string StringValue => "<VOID>";
	public override bool IsFullyRead => reader?.IsReadClosed ?? true;

	public EBMLVoidElement(EBMLVInt dataSize, long offset)
	   : base(EBMLElementDefiniton.Void, dataSize, offset) { }

	public EBMLVoidElement(EBMLVInt dataSize, long offset, IDataQueueReader reader, bool encapsulated = false)
	   : base(EBMLElementDefiniton.Void, dataSize, offset)
	{
		if (encapsulated) { this.reader = reader; }
		else { this.reader = new DataQueueLimitedReader(reader, (long)dataSize.Value, true); }
	}

	public EBMLVoidElement(int size) : this(new EBMLVInt((ulong)size), -1) { }
}

public sealed class EBMLMasterElement : EBMLElement
{
	private bool isFullyRead;

	public override string StringValue => "<MASTER>";
	public override bool IsFullyRead => isFullyRead;

	private readonly List<EBMLElement> children = new();
	private EBMLElement[] childArray;

	public override EBMLElement[] Children => childArray ??= children.ToArray();

	public EBMLMasterElement(EBMLElementDefiniton def)
	   : base(def, EBMLVInt.CreateUnknown(1), -1) { }

	public EBMLMasterElement(EBMLElementDefiniton def, EBMLVInt dataSize, long offset)
	   : base(def, dataSize, offset)
	{
		if (def.Type != EBMLElementType.Master) { throw new ArgumentException("Type mismatch", nameof(def)); }
	}

	public int EstimateSize()
	{
		int size = 0;
		foreach (var child in Children)
		{
			if (child is EBMLMasterElement m) { size += m.EstimateSize(); }
			else if (!child.DataSize.IsUnknownValue) { size += (int)child.DataSize.Value; }
			size += child.Definition.Id.WidthBytes + child.DataSize.WidthBytes;
		}
		return size;
	}

	public void AddChild(EBMLElement element)
	{
		childArray = null;
		element.SetParent(this);
		children.Add(element);
	}

	public bool IsParentOf(EBMLElement element)
	{
		do
		{
			if (element == null) { return false; }
			element = element.Parent;
			if (element == this) { return true; }
		}
		while (true);
	}

	internal void MarkAsFullyRead()
	{
		isFullyRead = true;
	}

	public string ToFullString(string prefix = null, string indent = "  ")
	{
		if (prefix == null) { prefix = string.Empty; }
		var text = new StringBuilder();
		text.Append(prefix);
		text.AppendLine(ToString());
		prefix += indent;
		foreach (var child in Children)
		{
			if (child is EBMLMasterElement m)
			{
				text.Append(m.ToFullString(prefix, indent));
			}
			else
			{
				text.Append(prefix);
				text.AppendLine(child.ToString());
			}
		}
		return text.ToString();
	}
}