Mercurial > hg > truffle

comparison agent/src/os/win32/Buffer.hpp @ 0:a61af66fc99e jdk7-b24

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Initial load
author duke
date Sat, 01 Dec 2007 00:00:00 +0000
parents
children c18cbe5936b8
comparison
equal deleted inserted replaced
-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2001 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 #ifndef _BUFFER_
26 #define _BUFFER_
27
28 // A Buffer is the backing store for the IOBuf abstraction and
29 // supports producer-consumer filling and draining.
30
31 class Buffer {
32 public:
33 Buffer(int bufSize);
34 ~Buffer();
35
36 char* fillPos(); // Position of the place where buffer should be filled
37 int remaining(); // Number of bytes that can be placed starting at fillPos
38 int size(); // Size of the buffer
39 // Move up fill position by amount (decreases remaining()); returns
40 // false if not enough space
41 bool incrFillPos(int amt);
42
43 // Read single byte (0..255); returns -1 if no data available.
44 int readByte();
45 // Read multiple bytes, non-blocking (this buffer does not define a
46 // fill mechanism), into provided buffer. Returns number of bytes read.
47 int readBytes(char* buf, int len);
48
49 // Access to drain position. Be very careful using this.
50 char* drainPos();
51 int drainRemaining();
52 bool incrDrainPos(int amt);
53
54 // Compact buffer, removing already-consumed input. This must be
55 // called periodically to yield the illusion of an infinite buffer.
56 void compact();
57
58 private:
59 Buffer(const Buffer&);
60 Buffer& operator=(const Buffer&);
61
62 char* buf;
63 int sz;
64 int fill;
65 int drain;
66 };
67
68 #endif // #defined _BUFFER_