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Viewing changes to external/mono-addins/Mono.Addins.CecilReflector/Mono.Cecil/Mono.Cecil.PE/ByteBuffer.cs

  • Committer: Package Import Robot
  • Author(s): Jo Shields
  • Date: 2013-05-12 09:46:03 UTC
  • mto: This revision was merged to the branch mainline in revision 29.
  • Revision ID: package-import@ubuntu.com-20130512094603-mad323bzcxvmcam0
Tags: upstream-4.0.5+dfsg
Import upstream version 4.0.5+dfsg

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external/mono-addins/Mono.Addins.CecilReflector/Mono.Cecil/Mono.Cecil.PE/ByteBuffer.cs
 
1
//
 
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// ByteBuffer.cs
 
3
//
 
4
// Author:
 
5
//   Jb Evain (jbevain@gmail.com)
 
6
//
 
7
// Copyright (c) 2008 - 2010 Jb Evain
 
8
//
 
9
// Permission is hereby granted, free of charge, to any person obtaining
 
10
// a copy of this software and associated documentation files (the
 
11
// "Software"), to deal in the Software without restriction, including
 
12
// without limitation the rights to use, copy, modify, merge, publish,
 
13
// distribute, sublicense, and/or sell copies of the Software, and to
 
14
// permit persons to whom the Software is furnished to do so, subject to
 
15
// the following conditions:
 
16
//
 
17
// The above copyright notice and this permission notice shall be
 
18
// included in all copies or substantial portions of the Software.
 
19
//
 
20
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 
21
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 
22
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 
23
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 
24
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 
25
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 
26
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
27
//
 
28
 
 
29
using System;
 
30
 
 
31
namespace Mono.Cecil.PE {
 
32
 
 
33
        class ByteBuffer {
 
34
 
 
35
                internal byte [] buffer;
 
36
                internal int length;
 
37
                internal int position;
 
38
 
 
39
                public ByteBuffer ()
 
40
                {
 
41
                        this.buffer = Empty<byte>.Array;
 
42
                }
 
43
 
 
44
                public ByteBuffer (int length)
 
45
                {
 
46
                        this.buffer = new byte [length];
 
47
                }
 
48
 
 
49
                public ByteBuffer (byte [] buffer)
 
50
                {
 
51
                        this.buffer = buffer ?? Empty<byte>.Array;
 
52
                        this.length = this.buffer.Length;
 
53
                }
 
54
 
 
55
                public void Reset (byte [] buffer)
 
56
                {
 
57
                        this.buffer = buffer ?? Empty<byte>.Array;
 
58
                        this.length = this.buffer.Length;
 
59
                }
 
60
 
 
61
                public void Advance (int length)
 
62
                {
 
63
                        position += length;
 
64
                }
 
65
 
 
66
                public byte ReadByte ()
 
67
                {
 
68
                        return buffer [position++];
 
69
                }
 
70
 
 
71
                public sbyte ReadSByte ()
 
72
                {
 
73
                        return (sbyte) ReadByte ();
 
74
                }
 
75
 
 
76
                public byte [] ReadBytes (int length)
 
77
                {
 
78
                        var bytes = new byte [length];
 
79
                        Buffer.BlockCopy (buffer, position, bytes, 0, length);
 
80
                        position += length;
 
81
                        return bytes;
 
82
                }
 
83
 
 
84
                public ushort ReadUInt16 ()
 
85
                {
 
86
                        ushort value = (ushort) (buffer [position]
 
87
                                | (buffer [position + 1] << 8));
 
88
                        position += 2;
 
89
                        return value;
 
90
                }
 
91
 
 
92
                public short ReadInt16 ()
 
93
                {
 
94
                        return (short) ReadUInt16 ();
 
95
                }
 
96
 
 
97
                public uint ReadUInt32 ()
 
98
                {
 
99
                        uint value = (uint) (buffer [position]
 
100
                                | (buffer [position + 1] << 8)
 
101
                                | (buffer [position + 2] << 16)
 
102
                                | (buffer [position + 3] << 24));
 
103
                        position += 4;
 
104
                        return value;
 
105
                }
 
106
 
 
107
                public int ReadInt32 ()
 
108
                {
 
109
                        return (int) ReadUInt32 ();
 
110
                }
 
111
 
 
112
                public ulong ReadUInt64 ()
 
113
                {
 
114
                        uint low = ReadUInt32 ();
 
115
                        uint high = ReadUInt32 ();
 
116
 
 
117
                        return (((ulong) high) << 32) | low;
 
118
                }
 
119
 
 
120
                public long ReadInt64 ()
 
121
                {
 
122
                        return (long) ReadUInt64 ();
 
123
                }
 
124
 
 
125
                public uint ReadCompressedUInt32 ()
 
126
                {
 
127
                        byte first = ReadByte ();
 
128
                        if ((first & 0x80) == 0)
 
129
                                return first;
 
130
 
 
131
                        if ((first & 0x40) == 0)
 
132
                                return ((uint) (first & ~0x80) << 8)
 
133
                                        | ReadByte ();
 
134
 
 
135
                        return ((uint) (first & ~0xc0) << 24)
 
136
                                | (uint) ReadByte () << 16
 
137
                                | (uint) ReadByte () << 8
 
138
                                | ReadByte ();
 
139
                }
 
140
 
 
141
                public int ReadCompressedInt32 ()
 
142
                {
 
143
                        var value = (int) ReadCompressedUInt32 ();
 
144
 
 
145
                        return (value & 1) != 0
 
146
                                ? -(value >> 1)
 
147
                                : value >> 1;
 
148
                }
 
149
 
 
150
                public float ReadSingle ()
 
151
                {
 
152
                        if (!BitConverter.IsLittleEndian) {
 
153
                                var bytes = ReadBytes (4);
 
154
                                Array.Reverse (bytes);
 
155
                                return BitConverter.ToSingle (bytes, 0);
 
156
                        }
 
157
 
 
158
                        float value = BitConverter.ToSingle (buffer, position);
 
159
                        position += 4;
 
160
                        return value;
 
161
                }
 
162
 
 
163
                public double ReadDouble ()
 
164
                {
 
165
                        if (!BitConverter.IsLittleEndian) {
 
166
                                var bytes = ReadBytes (8);
 
167
                                Array.Reverse (bytes);
 
168
                                return BitConverter.ToDouble (bytes, 0);
 
169
                        }
 
170
 
 
171
                        double value = BitConverter.ToDouble (buffer, position);
 
172
                        position += 8;
 
173
                        return value;
 
174
                }
 
175
 
 
176
#if !READ_ONLY
 
177
 
 
178
                public void WriteByte (byte value)
 
179
                {
 
180
                        if (position == buffer.Length)
 
181
                                Grow (1);
 
182
 
 
183
                        buffer [position++] = value;
 
184
 
 
185
                        if (position > length)
 
186
                                length = position;
 
187
                }
 
188
 
 
189
                public void WriteSByte (sbyte value)
 
190
                {
 
191
                        WriteByte ((byte) value);
 
192
                }
 
193
 
 
194
                public void WriteUInt16 (ushort value)
 
195
                {
 
196
                        if (position + 2 > buffer.Length)
 
197
                                Grow (2);
 
198
 
 
199
                        buffer [position++] = (byte) value;
 
200
                        buffer [position++] = (byte) (value >> 8);
 
201
 
 
202
                        if (position > length)
 
203
                                length = position;
 
204
                }
 
205
 
 
206
                public void WriteInt16 (short value)
 
207
                {
 
208
                        WriteUInt16 ((ushort) value);
 
209
                }
 
210
 
 
211
                public void WriteUInt32 (uint value)
 
212
                {
 
213
                        if (position + 4 > buffer.Length)
 
214
                                Grow (4);
 
215
 
 
216
                        buffer [position++] = (byte) value;
 
217
                        buffer [position++] = (byte) (value >> 8);
 
218
                        buffer [position++] = (byte) (value >> 16);
 
219
                        buffer [position++] = (byte) (value >> 24);
 
220
 
 
221
                        if (position > length)
 
222
                                length = position;
 
223
                }
 
224
 
 
225
                public void WriteInt32 (int value)
 
226
                {
 
227
                        WriteUInt32 ((uint) value);
 
228
                }
 
229
 
 
230
                public void WriteUInt64 (ulong value)
 
231
                {
 
232
                        if (position + 8 > buffer.Length)
 
233
                                Grow (8);
 
234
 
 
235
                        buffer [position++] = (byte) value;
 
236
                        buffer [position++] = (byte) (value >> 8);
 
237
                        buffer [position++] = (byte) (value >> 16);
 
238
                        buffer [position++] = (byte) (value >> 24);
 
239
                        buffer [position++] = (byte) (value >> 32);
 
240
                        buffer [position++] = (byte) (value >> 40);
 
241
                        buffer [position++] = (byte) (value >> 48);
 
242
                        buffer [position++] = (byte) (value >> 56);
 
243
 
 
244
                        if (position > length)
 
245
                                length = position;
 
246
                }
 
247
 
 
248
                public void WriteInt64 (long value)
 
249
                {
 
250
                        WriteUInt64 ((ulong) value);
 
251
                }
 
252
 
 
253
                public void WriteCompressedUInt32 (uint value)
 
254
                {
 
255
                        if (value < 0x80)
 
256
                                WriteByte ((byte) value);
 
257
                        else if (value < 0x4000) {
 
258
                                WriteByte ((byte) (0x80 | (value >> 8)));
 
259
                                WriteByte ((byte) (value & 0xff));
 
260
                        } else {
 
261
                                WriteByte ((byte) ((value >> 24) | 0xc0));
 
262
                                WriteByte ((byte) ((value >> 16) & 0xff));
 
263
                                WriteByte ((byte) ((value >> 8) & 0xff));
 
264
                                WriteByte ((byte) (value & 0xff));
 
265
                        }
 
266
                }
 
267
 
 
268
                public void WriteCompressedInt32 (int value)
 
269
                {
 
270
                        WriteCompressedUInt32 ((uint) ((value < 0) ? ((-value) << 1) | 1 : value << 1));
 
271
                }
 
272
 
 
273
                public void WriteBytes (byte [] bytes)
 
274
                {
 
275
                        var length = bytes.Length;
 
276
                        if (position + length > buffer.Length)
 
277
                                Grow (length);
 
278
 
 
279
                        Buffer.BlockCopy (bytes, 0, buffer, position, length);
 
280
                        position += length;
 
281
 
 
282
                        if (position > this.length)
 
283
                                this.length = position;
 
284
                }
 
285
 
 
286
                public void WriteBytes (int length)
 
287
                {
 
288
                        if (position + length > buffer.Length)
 
289
                                Grow (length);
 
290
 
 
291
                        position += length;
 
292
 
 
293
                        if (position > this.length)
 
294
                                this.length = position;
 
295
                }
 
296
 
 
297
                public void WriteBytes (ByteBuffer buffer)
 
298
                {
 
299
                        if (position + buffer.length > this.buffer.Length)
 
300
                                Grow (buffer.length);
 
301
 
 
302
                        Buffer.BlockCopy (buffer.buffer, 0, this.buffer, position, buffer.length);
 
303
                        position += buffer.length;
 
304
 
 
305
                        if (position > this.length)
 
306
                                this.length = position;
 
307
                }
 
308
 
 
309
                public void WriteSingle (float value)
 
310
                {
 
311
                        var bytes = BitConverter.GetBytes (value);
 
312
 
 
313
                        if (!BitConverter.IsLittleEndian)
 
314
                                Array.Reverse (bytes);
 
315
 
 
316
                        WriteBytes (bytes);
 
317
                }
 
318
 
 
319
                public void WriteDouble (double value)
 
320
                {
 
321
                        var bytes = BitConverter.GetBytes (value);
 
322
 
 
323
                        if (!BitConverter.IsLittleEndian)
 
324
                                Array.Reverse (bytes);
 
325
 
 
326
                        WriteBytes (bytes);
 
327
                }
 
328
 
 
329
                void Grow (int desired)
 
330
                {
 
331
                        var current = this.buffer;
 
332
                        var current_length = current.Length;
 
333
 
 
334
                        var buffer = new byte [System.Math.Max (current_length + desired, current_length * 2)];
 
335
                        Buffer.BlockCopy (current, 0, buffer, 0, current_length);
 
336
                        this.buffer = buffer;
 
337
                }
 
338
 
 
339
#endif
 
340
 
 
341
        }
 
342
}