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
|
// ============================================================================================
// .NET API for EJDB database library http://ejdb.org
// Copyright (C) 2012-2013 Softmotions Ltd <info@softmotions.com>
//
// This file is part of EJDB.
// EJDB is free software; you can redistribute it and/or modify it under the terms of
// the GNU Lesser General Public License as published by the Free Software Foundation; either
// version 2.1 of the License or any later version. EJDB is distributed in the hope
// that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
// License for more details.
// You should have received a copy of the GNU Lesser General Public License along with EJDB;
// if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
// Boston, MA 02111-1307 USA.
// ============================================================================================
using System;
using System.Text;
using System.Diagnostics;
using System.IO;
using Ejdb.IO;
namespace Ejdb.BSON {
public class BSONIterator : IDisposable {
ExtBinaryReader _input;
int _doclen;
BSONType _ctype = BSONType.UNKNOWN;
string _entryKey;
int _entryLen;
bool _entryDataSkipped;
BSONValue _entryDataValue;
public bool Disposed {
get {
return (_input == null);
}
}
public int DocumentLength {
get { return this._doclen; }
private set { this._doclen = value; }
}
public BSONIterator(BSONDocument doc) : this(doc.ToByteArray()) {
}
public BSONIterator(byte[] bbuf) : this(new MemoryStream(bbuf)) {
}
public BSONIterator(Stream input) {
if (!input.CanRead) {
Dispose();
throw new IOException("Input stream must be readable");
}
if (!input.CanSeek) {
Dispose();
throw new IOException("Input stream must be seekable");
}
this._input = new ExtBinaryReader(input);
this._ctype = BSONType.UNKNOWN;
this._doclen = _input.ReadInt32();
if (this._doclen < 5) {
Dispose();
throw new InvalidBSONDataException("Unexpected end of BSON document");
}
}
BSONIterator(ExtBinaryReader input, int doclen) {
this._input = input;
this._doclen = doclen;
if (this._doclen < 5) {
Dispose();
throw new InvalidBSONDataException("Unexpected end of BSON document");
}
}
~BSONIterator() {
Dispose();
}
public void Dispose() {
if (_input != null) {
_input.Close();
_input = null;
}
}
void CheckDisposed() {
if (Disposed) {
throw new Exception("BSONIterator already disposed");
}
}
public BSONType Next() {
CheckDisposed();
if (_ctype == BSONType.EOO) {
return BSONType.EOO;
}
if (!_entryDataSkipped && _ctype != BSONType.UNKNOWN) {
SkipData();
}
byte bv = _input.ReadByte();
if (!Enum.IsDefined(typeof(BSONType), bv)) {
throw new InvalidBSONDataException("Unknown bson type: " + bv);
}
_entryDataSkipped = false;
_entryDataValue = null;
_entryKey = null;
_ctype = (BSONType) bv;
_entryLen = 0;
if (_ctype != BSONType.EOO) {
ReadKey();
}
switch (_ctype) {
case BSONType.EOO:
return BSONType.EOO;
case BSONType.UNDEFINED:
case BSONType.NULL:
case BSONType.MAXKEY:
case BSONType.MINKEY:
_entryLen = 0;
break;
case BSONType.BOOL:
_entryLen = 1;
break;
case BSONType.INT:
_entryLen = 4;
break;
case BSONType.LONG:
case BSONType.DOUBLE:
case BSONType.TIMESTAMP:
case BSONType.DATE:
_entryLen = 8;
break;
case BSONType.OID:
_entryLen = 12;
break;
case BSONType.STRING:
case BSONType.CODE:
case BSONType.SYMBOL:
_entryLen = 4 + _input.ReadInt32();
break;
case BSONType.DBREF:
//Unsupported DBREF!
_entryLen = 4 + 12 + _input.ReadInt32();
break;
case BSONType.BINDATA:
_entryLen = 4 + 1 + _input.ReadInt32();
break;
case BSONType.OBJECT:
case BSONType.ARRAY:
case BSONType.CODEWSCOPE:
_entryLen = 4 + _input.ReadInt32();
break;
case BSONType.REGEX:
_entryLen = 0;
break;
default:
throw new InvalidBSONDataException("Unknown entry type: " + _ctype);
}
return _ctype;
}
public BSONValue FetchCurrentValue() {
CheckDisposed();
if (_entryDataSkipped) {
return _entryDataValue;
}
_entryDataSkipped = true;
switch (_ctype) {
case BSONType.EOO:
case BSONType.UNDEFINED:
case BSONType.NULL:
case BSONType.MAXKEY:
case BSONType.MINKEY:
_entryDataValue = new BSONValue(_ctype, _entryKey);
break;
case BSONType.OID:
Debug.Assert(_entryLen == 12);
_entryDataValue = new BSONValue(_ctype, _entryKey, new BSONOid(_input));
break;
case BSONType.STRING:
case BSONType.CODE:
case BSONType.SYMBOL:
{
Debug.Assert(_entryLen - 5 >= 0);
string sv = Encoding.UTF8.GetString(_input.ReadBytes(_entryLen - 5));
_entryDataValue = new BSONValue(_ctype, _entryKey, sv);
Debug.Assert(_input.ReadByte() == 0x00); //trailing zero byte
break;
}
case BSONType.BOOL:
_entryDataValue = new BSONValue(_ctype, _entryKey, _input.ReadBoolean());
break;
case BSONType.INT:
_entryDataValue = new BSONValue(_ctype, _entryKey, _input.ReadInt32());
break;
case BSONType.OBJECT:
case BSONType.ARRAY:
{
BSONDocument doc = (_ctype == BSONType.OBJECT ? new BSONDocument() : new BSONArray());
BSONIterator sit = new BSONIterator(this._input, _entryLen - 4);
while (sit.Next() != BSONType.EOO) {
doc.Add(sit.FetchCurrentValue());
}
_entryDataValue = new BSONValue(_ctype, _entryKey, doc);
break;
}
case BSONType.DOUBLE:
_entryDataValue = new BSONValue(_ctype, _entryKey, _input.ReadDouble());
break;
case BSONType.LONG:
_entryDataValue = new BSONValue(_ctype, _entryKey, _input.ReadInt64());
break;
case BSONType.DATE:
_entryDataValue = new BSONValue(_ctype, _entryKey,
BSONConstants.Epoch.AddMilliseconds(_input.ReadInt64()));
break;
case BSONType.TIMESTAMP:
{
int inc = _input.ReadInt32();
int ts = _input.ReadInt32();
_entryDataValue = new BSONValue(_ctype, _entryKey,
new BSONTimestamp(inc, ts));
break;
}
case BSONType.REGEX:
{
string re = _input.ReadCString();
string opts = _input.ReadCString();
_entryDataValue = new BSONValue(_ctype, _entryKey,
new BSONRegexp(re, opts));
break;
}
case BSONType.BINDATA:
{
byte subtype = _input.ReadByte();
BSONBinData bd = new BSONBinData(subtype, _entryLen - 4, _input);
_entryDataValue = new BSONValue(_ctype, _entryKey, bd);
break;
}
case BSONType.DBREF:
{
//Unsupported DBREF!
SkipData(true);
_entryDataValue = new BSONValue(_ctype, _entryKey);
break;
}
case BSONType.CODEWSCOPE:
{
int cwlen = _entryLen - 4;
Debug.Assert(cwlen > 5);
int clen = _input.ReadInt32(); //code length
string code = Encoding.UTF8.GetString(_input.ReadBytes(clen));
BSONCodeWScope cw = new BSONCodeWScope(code);
BSONIterator sit = new BSONIterator(_input, _input.ReadInt32());
while (sit.Next() != BSONType.EOO) {
cw.Add(sit.FetchCurrentValue());
}
_entryDataValue = new BSONValue(_ctype, _entryKey, cw);
break;
}
}
return _entryDataValue;
}
void SkipData(bool force = false) {
if (_entryDataSkipped && !force) {
return;
}
_entryDataValue = null;
_entryDataSkipped = true;
if (_ctype == BSONType.REGEX) {
_input.SkipCString();
_input.SkipCString();
Debug.Assert(_entryLen == 0);
} else if (_entryLen > 0) {
long cpos = _input.BaseStream.Position;
if ((cpos + _entryLen) != _input.BaseStream.Seek(_entryLen, SeekOrigin.Current)) {
throw new IOException("Inconsitent seek within input BSON stream");
}
_entryLen = 0;
}
}
string ReadKey() {
_entryKey = _input.ReadCString();
return _entryKey;
}
}
}
|
