File: TarOutputStream.cs

package info (click to toggle)
mono 4.6.2.7+dfsg-1
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 778,148 kB
  • ctags: 914,052
  • sloc: cs: 5,779,509; xml: 2,773,713; ansic: 432,645; sh: 14,749; makefile: 12,361; perl: 2,488; python: 1,434; cpp: 849; asm: 531; sql: 95; sed: 16; php: 1
file content (428 lines) | stat: -rw-r--r-- 13,127 bytes parent folder | download | duplicates (2)
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
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
// TarOutputStream.cs
//
// Copyright (C) 2001 Mike Krueger
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
//
// Linking this library statically or dynamically with other modules is
// making a combined work based on this library.  Thus, the terms and
// conditions of the GNU General Public License cover the whole
// combination.
// 
// As a special exception, the copyright holders of this library give you
// permission to link this library with independent modules to produce an
// executable, regardless of the license terms of these independent
// modules, and to copy and distribute the resulting executable under
// terms of your choice, provided that you also meet, for each linked
// independent module, the terms and conditions of the license of that
// module.  An independent module is a module which is not derived from
// or based on this library.  If you modify this library, you may extend
// this exception to your version of the library, but you are not
// obligated to do so.  If you do not wish to do so, delete this
// exception statement from your version.

using System;
using System.IO;
using System.Text;

namespace ICSharpCode.SharpZipLib.Tar 
{
	
	/// <summary>
	/// The TarOutputStream writes a UNIX tar archive as an OutputStream.
	/// Methods are provided to put entries, and then write their contents
	/// by writing to this stream using write().
	/// </summary>
	/// public
	public class TarOutputStream : Stream
	{
		/// <summary>
		/// flag indicating debugging code should be activated or not
		/// </summary>
		protected bool      debug;
		
		/// <summary>
		/// Size for the current entry
		/// </summary>
		protected long      currSize;

		/// <summary>
		/// bytes written for this entry so far
		/// </summary>
		protected long       currBytes;
		
		/// <summary>
		/// single block working buffer 
		/// </summary>
		protected byte[]    blockBuf;

		/// <summary>
		/// current 'Assembly' buffer length
		/// </summary>		
		protected int       assemLen;
		
		/// <summary>
		/// 'Assembly' buffer used to assmble data before writing
		/// </summary>
		protected byte[]    assemBuf;
		
		/// <summary>
		/// TarBuffer used to provide correct blocking factor
		/// </summary>
		protected TarBuffer buffer;
		
		/// <summary>
		/// the destination stream for the archive contents
		/// </summary>
		protected Stream    outputStream;
		
		/// <summary>
		/// true if the stream supports reading; otherwise, false.
		/// </summary>
		public override bool CanRead {
			get {
				return outputStream.CanRead;
			}
		}
		
		/// <summary>
		/// true if the stream supports seeking; otherwise, false.
		/// </summary>
		public override bool CanSeek {
			get {
				return outputStream.CanSeek;
			}
		}
		
		/// <summary>
		/// true if stream supports writing; otherwise, false.
		/// </summary>
		public override bool CanWrite {
			get {
				return outputStream.CanWrite;
			}
		}
		
		/// <summary>
		/// length of stream in bytes
		/// </summary>
		public override long Length {
			get {
				return outputStream.Length;
			}
		}
		
		/// <summary>
		/// gets or sets the position within the current stream.
		/// </summary>
		public override long Position {
			get {
				return outputStream.Position;
			}
			set {
				outputStream.Position = value;
			}
		}
		
		/// <summary>
		/// set the position within the current stream
		/// </summary>
		public override long Seek(long offset, SeekOrigin origin)
		{
			return outputStream.Seek(offset, origin);
		}
		
		/// <summary>
		/// set the length of the current stream
		/// </summary>
		public override void SetLength(long val)
		{
			outputStream.SetLength(val);
		}
		
		/// <summary>
		/// Read a byte from the stream and advance the position within the stream 
		/// by one byte or returns -1 if at the end of the stream.
		/// </summary>
		/// <returns>The byte value or -1 if at end of stream</returns>
		public override int ReadByte()
		{
			return outputStream.ReadByte();
		}
		
		/// <summary>
		/// read bytes from the current stream and advance the position within the 
		/// stream by the number of bytes read.
		/// </summary>
		/// <returns>The total number of bytes read, or zero if at the end of the stream</returns>
		public override int Read(byte[] b, int off, int len)
		{
			return outputStream.Read(b, off, len);
		}

		/// <summary>
		/// All buffered data is written to destination
		/// </summary>		
		public override void Flush()
		{
			outputStream.Flush();
		}
				
		/// <summary>
		/// Construct TarOutputStream using default block factor
		/// </summary>
		/// <param name="outputStream">stream to write to</param>
		public TarOutputStream(Stream outputStream) : this(outputStream, TarBuffer.DefaultBlockFactor)
		{
		}
		
		/// <summary>
		/// Construct TarOutputStream with user specified block factor
		/// </summary>
		/// <param name="outputStream">stream to write to</param>
		/// <param name="blockFactor">blocking factor</param>
		public TarOutputStream(Stream outputStream, int blockFactor)
		{
			this.outputStream = outputStream;
			this.buffer       = TarBuffer.CreateOutputTarBuffer(outputStream, blockFactor);
			
			this.debug        = false;
			this.assemLen     = 0;
			this.assemBuf     = new byte[TarBuffer.BlockSize];
			this.blockBuf     = new byte[TarBuffer.BlockSize];
		}
		
		/// <summary>
		/// Ends the TAR archive without closing the underlying OutputStream.
		/// The result is that the EOF record of nulls is written.
		/// </summary>
		public void Finish()
		{
			this.WriteEOFRecord();
		}
		
		/// <summary>
		/// Ends the TAR archive and closes the underlying OutputStream.
		/// This means that finish() is called followed by calling the
		/// TarBuffer's close().
		/// </summary>
		public override void Close()
		{
			this.Finish();
			this.buffer.Close();
		}
		
		/// <summary>
		/// Get the record size being used by this stream's TarBuffer.
		/// </summary>
		/// <returns>
		/// The TarBuffer record size.
		/// </returns>
		public int GetRecordSize()
		{
			return this.buffer.GetRecordSize();
		}
		
		/// <summary>
		/// Put an entry on the output stream. This writes the entry's
		/// header and positions the output stream for writing
		/// the contents of the entry. Once this method is called, the
		/// stream is ready for calls to write() to write the entry's
		/// contents. Once the contents are written, closeEntry()
		/// <B>MUST</B> be called to ensure that all buffered data
		/// is completely written to the output stream.
		/// </summary>
		/// <param name="entry">
		/// The TarEntry to be written to the archive.
		/// </param>
		public void PutNextEntry(TarEntry entry)
		{
			if (entry.TarHeader.Name.Length >= TarHeader.NAMELEN) {
				TarHeader longHeader = new TarHeader();
				longHeader.TypeFlag = TarHeader.LF_GNU_LONGNAME;
				longHeader.Name = longHeader.Name + "././@LongLink";
				longHeader.UserId = 0;
				longHeader.GroupId = 0;
				longHeader.GroupName = "";
				longHeader.UserName = "";
				longHeader.LinkName = "";

				longHeader.Size = entry.TarHeader.Name.Length;

				longHeader.WriteHeader(this.blockBuf);
				this.buffer.WriteBlock(this.blockBuf);  // Add special long filename header block

				int nameCharIndex = 0;

				while (nameCharIndex < entry.TarHeader.Name.Length) {
					Array.Clear(blockBuf, 0, blockBuf.Length);
					TarHeader.GetAsciiBytes(entry.TarHeader.Name, nameCharIndex, this.blockBuf, 0, TarBuffer.BlockSize);
					nameCharIndex += TarBuffer.BlockSize;
					this.buffer.WriteBlock(this.blockBuf);
				}
			}
			
			entry.WriteEntryHeader(this.blockBuf);
			this.buffer.WriteBlock(this.blockBuf);
			
			this.currBytes = 0;
			
			this.currSize = entry.IsDirectory ? 0 : entry.Size;
		}
		
		/// <summary>
		/// Close an entry. This method MUST be called for all file
		/// entries that contain data. The reason is that we must
		/// buffer data written to the stream in order to satisfy
		/// the buffer's block based writes. Thus, there may be
		/// data fragments still being assembled that must be written
		/// to the output stream before this entry is closed and the
		/// next entry written.
		/// </summary>
		public void CloseEntry()
		{
			if (this.assemLen > 0) {
				for (int i = this.assemLen; i < this.assemBuf.Length; ++i) {
					this.assemBuf[i] = 0;
				}
				
				this.buffer.WriteBlock(this.assemBuf);
				
				this.currBytes += this.assemLen;
				this.assemLen = 0;
			}
			
			if (this.currBytes < this.currSize) {
				throw new TarException("entry closed at '" + this.currBytes + "' before the '" + this.currSize + "' bytes specified in the header were written");
			}
		}
		
		/// <summary>
		/// Writes a byte to the current tar archive entry.
		/// This method simply calls Write(byte[], int, int).
		/// </summary>
		/// <param name="b">
		/// The byte to be written.
		/// </param>
		public override void WriteByte(byte b)
		{
			this.Write(new byte[] { b }, 0, 1);
		}
		
		/// <summary>
		/// Writes bytes to the current tar archive entry. This method
		/// is aware of the current entry and will throw an exception if
		/// you attempt to write bytes past the length specified for the
		/// current entry. The method is also (painfully) aware of the
		/// record buffering required by TarBuffer, and manages buffers
		/// that are not a multiple of recordsize in length, including
		/// assembling records from small buffers.
		/// </summary>
		/// <param name = "wBuf">
		/// The buffer to write to the archive.
		/// </param>
		/// <param name = "wOffset">
		/// The offset in the buffer from which to get bytes.
		/// </param>
		/// <param name = "numToWrite">
		/// The number of bytes to write.
		/// </param>
		public override void Write(byte[] wBuf, int wOffset, int numToWrite)
		{
			if (wBuf == null) {
				throw new ArgumentNullException("TarOutputStream.Write buffer null");
			}
			
			if ((this.currBytes + numToWrite) > this.currSize) {
				throw new ArgumentOutOfRangeException("request to write '" + numToWrite + "' bytes exceeds size in header of '" + this.currSize + "' bytes");
			}
			
			//
			// We have to deal with assembly!!!
			// The programmer can be writing little 32 byte chunks for all
			// we know, and we must assemble complete blocks for writing.
			// TODO  REVIEW Maybe this should be in TarBuffer? Could that help to
			//        eliminate some of the buffer copying.
			//
			if (this.assemLen > 0) {
				if ((this.assemLen + numToWrite ) >= this.blockBuf.Length) {
					int aLen = this.blockBuf.Length - this.assemLen;
					
					Array.Copy(this.assemBuf, 0, this.blockBuf, 0, this.assemLen);
					Array.Copy(wBuf, wOffset, this.blockBuf, this.assemLen, aLen);
					
					this.buffer.WriteBlock(this.blockBuf);
					
					this.currBytes += this.blockBuf.Length;
					
					wOffset    += aLen;
					numToWrite -= aLen;
					
					this.assemLen = 0;
				} else {					// ( (this.assemLen + numToWrite ) < this.blockBuf.length )
					Array.Copy(wBuf, wOffset, this.assemBuf, this.assemLen, numToWrite);
					wOffset       += numToWrite;
					this.assemLen += numToWrite;
					numToWrite -= numToWrite;
				}
			}
			
			//
			// When we get here we have EITHER:
			//   o An empty "assemble" buffer.
			//   o No bytes to write (numToWrite == 0)
			//
			while (numToWrite > 0) {
				if (numToWrite < this.blockBuf.Length) {
					Array.Copy(wBuf, wOffset, this.assemBuf, this.assemLen, numToWrite);
					this.assemLen += numToWrite;
					break;
				}
				
				this.buffer.WriteBlock(wBuf, wOffset);
				
				int num = this.blockBuf.Length;
				this.currBytes += num;
				numToWrite     -= num;
				wOffset        += num;
			}
		}
		
		/// <summary>
		/// Write an EOF (end of archive) record to the tar archive.
		/// An EOF record consists of a record of all zeros.
		/// </summary>
		void WriteEOFRecord()
		{
			Array.Clear(blockBuf, 0, blockBuf.Length);
			this.buffer.WriteBlock(this.blockBuf);
		}
	}
}

/* The original Java file had this header:
	** Authored by Timothy Gerard Endres
	** <mailto:time@gjt.org>  <http://www.trustice.com>
	**
	** This work has been placed into the public domain.
	** You may use this work in any way and for any purpose you wish.
	**
	** THIS SOFTWARE IS PROVIDED AS-IS WITHOUT WARRANTY OF ANY KIND,
	** NOT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY. THE AUTHOR
	** OF THIS SOFTWARE, ASSUMES _NO_ RESPONSIBILITY FOR ANY
	** CONSEQUENCE RESULTING FROM THE USE, MODIFICATION, OR
	** REDISTRIBUTION OF THIS SOFTWARE.
	**
	*/