source: trunk/src/qt3support/other/q3membuf.cpp@ 439

Last change on this file since 439 was 2, checked in by Dmitry A. Kuminov, 16 years ago

Initially imported qt-all-opensource-src-4.5.1 from Trolltech.
File size: 5.2 KB
Line 
1/****************************************************************************
2**
3** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
4** Contact: Qt Software Information ([email protected])
5**
6** This file is part of the Qt3Support module of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial Usage
10** Licensees holding valid Qt Commercial licenses may use this file in
11** accordance with the Qt Commercial License Agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and Nokia.
14**
15** GNU Lesser General Public License Usage
16** Alternatively, this file may be used under the terms of the GNU Lesser
17** General Public License version 2.1 as published by the Free Software
18** Foundation and appearing in the file LICENSE.LGPL included in the
19** packaging of this file. Please review the following information to
20** ensure the GNU Lesser General Public License version 2.1 requirements
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28** GNU General Public License Usage
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30** General Public License version 3.0 as published by the Free Software
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40****************************************************************************/
41
42#include "q3membuf_p.h"
43
44QT_BEGIN_NAMESPACE
45
46// *******************************************************************
47// QMembuf declaration and implementation
48// *******************************************************************
49
50/* \internal
51 This class implements an efficient buffering of data that is often used by
52 asynchronous IO classes like QSocket, QHttp and QProcess.
53*/
54
55Q3Membuf::Q3Membuf() : _size(0), _index(0)
56{
57}
58
59Q3Membuf::~Q3Membuf()
60{
61 while (!buf.isEmpty())
62 delete buf.takeFirst();
63}
64
65/*! \internal
66 This function consumes \a nbytes bytes of data from the
67 buffer and copies it into \a sink. If \a sink is a 0 pointer
68 the data goes into the nirvana.
69*/
70bool Q3Membuf::consumeBytes(Q_ULONG nbytes, char *sink)
71{
72 if (nbytes <= 0 || (qint64)nbytes > _size)
73 return false;
74 _size -= nbytes;
75 while (!buf.isEmpty()) {
76 QByteArray *a = buf.first();
77 if ((int)(_index + nbytes) >= a->size()) {
78 // Here we skip the whole byte array and get the next later
79 int len = a->size() - _index;
80 if (sink) {
81 memcpy(sink, a->constData()+_index, len);
82 sink += len;
83 }
84 nbytes -= len;
85 buf.removeFirst();
86 delete a;
87 _index = 0;
88 if (nbytes == 0)
89 break;
90 } else {
91 // Here we skip only a part of the first byte array
92 if (sink)
93 memcpy(sink, a->constData()+_index, nbytes);
94 _index += nbytes;
95 break;
96 }
97 }
98 return true;
99}
100
101/*! \internal
102 Scans for any occurrence of '\n' in the buffer. If \a store
103 is not 0 the text up to the first '\n' (or terminating 0) is
104 written to \a store, and a terminating 0 is appended to \a store
105 if necessary. Returns true if a '\n' was found; otherwise returns
106 false.
107*/
108bool Q3Membuf::scanNewline(QByteArray *store)
109{