forked from chronoxor/NetCoreServer
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathBuffer.cs
More file actions
239 lines (213 loc) · 7.56 KB
/
Copy pathBuffer.cs
File metadata and controls
239 lines (213 loc) · 7.56 KB
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
using System;
using System.Diagnostics;
using System.Text;
namespace NetCoreServer
{
/// <summary>
/// Dynamic byte buffer
/// </summary>
public class Buffer
{
private byte[] _data;
private long _size;
private long _offset;
/// <summary>
/// Is the buffer empty?
/// </summary>
public bool IsEmpty => (_data == null) || (_size == 0);
/// <summary>
/// Bytes memory buffer
/// </summary>
public byte[] Data => _data;
/// <summary>
/// Bytes memory buffer capacity
/// </summary>
public long Capacity => _data.Length;
/// <summary>
/// Bytes memory buffer size
/// </summary>
public long Size => _size;
/// <summary>
/// Bytes memory buffer offset
/// </summary>
public long Offset => _offset;
/// <summary>
/// Buffer indexer operator
/// </summary>
public byte this[long index] => _data[index];
/// <summary>
/// Initialize a new expandable buffer with zero capacity
/// </summary>
public Buffer() { _data = new byte[0]; _size = 0; _offset = 0; }
/// <summary>
/// Initialize a new expandable buffer with the given capacity
/// </summary>
public Buffer(long capacity) { _data = new byte[capacity]; _size = 0; _offset = 0; }
/// <summary>
/// Initialize a new expandable buffer with the given data
/// </summary>
public Buffer(byte[] data) { _data = data; _size = data.Length; _offset = 0; }
#region Memory buffer methods
/// <summary>
/// Get a span of bytes from the current buffer
/// </summary>
public Span<byte> AsSpan()
{
return new Span<byte>(_data, (int)_offset, (int)_size);
}
/// <summary>
/// Get a string from the current buffer
/// </summary>
public override string ToString()
{
return ExtractString(0, _size);
}
// Clear the current buffer and its offset
public void Clear()
{
_size = 0;
_offset = 0;
}
/// <summary>
/// Extract the string from buffer of the given offset and size
/// </summary>
public string ExtractString(long offset, long size)
{
Debug.Assert(((offset + size) <= Size), "Invalid offset & size!");
if ((offset + size) > Size)
throw new ArgumentException("Invalid offset & size!", nameof(offset));
return Encoding.UTF8.GetString(_data, (int)offset, (int)size);
}
/// <summary>
/// Remove the buffer of the given offset and size
/// </summary>
public void Remove(long offset, long size)
{
Debug.Assert(((offset + size) <= Size), "Invalid offset & size!");
if ((offset + size) > Size)
throw new ArgumentException("Invalid offset & size!", nameof(offset));
Array.Copy(_data, offset + size, _data, offset, _size - size - offset);
_size -= size;
if (_offset >= (offset + size))
_offset -= size;
else if (_offset >= offset)
{
_offset -= _offset - offset;
if (_offset > Size)
_offset = Size;
}
}
/// <summary>
/// Reserve the buffer of the given capacity
/// </summary>
public void Reserve(long capacity)
{
Debug.Assert((capacity >= 0), "Invalid reserve capacity!");
if (capacity < 0)
throw new ArgumentException("Invalid reserve capacity!", nameof(capacity));
if (capacity > Capacity)
{
byte[] data = new byte[Math.Max(capacity, 2 * Capacity)];
Array.Copy(_data, 0, data, 0, _size);
_data = data;
}
}
// Resize the current buffer
public void Resize(long size)
{
Reserve(size);
_size = size;
if (_offset > _size)
_offset = _size;
}
// Shift the current buffer offset
public void Shift(long offset) { _offset += offset; }
// Unshift the current buffer offset
public void Unshift(long offset) { _offset -= offset; }
#endregion
#region Buffer I/O methods
/// <summary>
/// Append the single byte
/// </summary>
/// <param name="value">Byte value to append</param>
/// <returns>Count of append bytes</returns>
public long Append(byte value)
{
Reserve(_size + 1);
_data[_size] = value;
_size += 1;
return 1;
}
/// <summary>
/// Append the given buffer
/// </summary>
/// <param name="buffer">Buffer to append</param>
/// <returns>Count of append bytes</returns>
public long Append(byte[] buffer)
{
Reserve(_size + buffer.Length);
Array.Copy(buffer, 0, _data, _size, buffer.Length);
_size += buffer.Length;
return buffer.Length;
}
/// <summary>
/// Append the given buffer fragment
/// </summary>
/// <param name="buffer">Buffer to append</param>
/// <param name="offset">Buffer offset</param>
/// <param name="size">Buffer size</param>
/// <returns>Count of append bytes</returns>
public long Append(byte[] buffer, long offset, long size)
{
Reserve(_size + size);
Array.Copy(buffer, offset, _data, _size, size);
_size += size;
return size;
}
/// <summary>
/// Append the given span of bytes
/// </summary>
/// <param name="buffer">Buffer to append as a span of bytes</param>
/// <returns>Count of append bytes</returns>
public long Append(ReadOnlySpan<byte> buffer)
{
Reserve(_size + buffer.Length);
buffer.CopyTo(new Span<byte>(_data, (int)_size, buffer.Length));
_size += buffer.Length;
return buffer.Length;
}
/// <summary>
/// Append the given buffer
/// </summary>
/// <param name="buffer">Buffer to append</param>
/// <returns>Count of append bytes</returns>
public long Append(Buffer buffer) => Append(buffer.AsSpan());
/// <summary>
/// Append the given text in UTF-8 encoding
/// </summary>
/// <param name="text">Text to append</param>
/// <returns>Count of append bytes</returns>
public long Append(string text)
{
int length = Encoding.UTF8.GetMaxByteCount(text.Length);
Reserve(_size + length);
long result = Encoding.UTF8.GetBytes(text, 0, text.Length, _data, (int)_size);
_size += result;
return result;
}
/// <summary>
/// Append the given text in UTF-8 encoding
/// </summary>
/// <param name="text">Text to append as a span of characters</param>
/// <returns>Count of append bytes</returns>
public long Append(ReadOnlySpan<char> text)
{
int length = Encoding.UTF8.GetMaxByteCount(text.Length);
Reserve(_size + length);
long result = Encoding.UTF8.GetBytes(text, new Span<byte>(_data, (int)_size, length));
_size += result;
return result;
}
#endregion
}
}