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klimitediodevice.h
1/* This file is part of the KDE libraries
2 Copyright (C) 2001, 2002 David Faure <david@mandrakesoft.com>
3
4 This library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public
6 License version 2 as published by the Free Software Foundation.
7
8 This library is distributed in the hope that it will be useful,
9 but WITHOUT ANY WARRANTY; without even the implied warranty of
10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 Library General Public License for more details.
12
13 You should have received a copy of the GNU Library General Public License
14 along with this library; see the file COPYING.LIB. If not, write to
15 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
16 Boston, MA 02110-1301, USA.
17*/
18
19#ifndef klimitediodevice_h
20#define klimitediodevice_h
21
22#include <kdebug.h>
23#include <tqiodevice.h>
31class TDEIO_EXPORT KLimitedIODevice : public TQIODevice
32{
33public:
41 KLimitedIODevice( TQIODevice *dev, int start, int length )
42 : m_dev( dev ), m_start( start ), m_length( length )
43 {
44 //kdDebug(7005) << "KLimitedIODevice::KLimitedIODevice start=" << start << " length=" << length << endl;
45 setType( IO_Direct ); // we support sequential too, but then atEnd() tries getch/ungetch !
46 open( IO_ReadOnly );
47 }
48 virtual ~KLimitedIODevice() {}
49
50 virtual bool open( int m ) {
51 //kdDebug(7005) << "KLimitedIODevice::open m=" << m << endl;
52 if ( m & IO_ReadOnly ) {
53 /*bool ok = false;
54 if ( m_dev->isOpen() )
55 ok = ( m_dev->mode() == IO_ReadOnly );
56 else
57 ok = m_dev->open( m );
58 if ( ok )*/
59 m_dev->at( m_start ); // No concurrent access !
60 }
61 else
62 kdWarning(7005) << "KLimitedIODevice::open only supports IO_ReadOnly!" << endl;
63 setState( IO_Open );
64 setMode( m );
65 return true;
66 }
67 virtual void close() {}
68 virtual void flush() {}
69
70 virtual Offset size() const { return m_length; }
71
72 virtual TQ_LONG readBlock ( char * data, TQ_ULONG maxlen )
73 {
74 maxlen = TQMIN( maxlen, m_length - at() ); // Apply upper limit
75 return m_dev->readBlock( data, maxlen );
76 }
77 virtual TQ_LONG writeBlock ( const char *, TQ_ULONG ) { return -1; } // unsupported
78 virtual int putch( int ) { return -1; } // unsupported
79
80 virtual int getch() {
81 char c[2];
82 if ( readBlock(c, 1) == -1)
83 return -1;
84 else
85 return c[0];
86 }
87 virtual int ungetch( int c ) { return m_dev->ungetch(c); } // ## apply lower limit ?
88 virtual Offset at() const { return m_dev->at() - m_start; }
89 virtual bool at( Offset pos ) {
90 Q_ASSERT( pos <= m_length );
91 pos = TQMIN( pos, m_length ); // Apply upper limit
92 return m_dev->at( m_start + pos );
93 }
94 virtual bool atEnd() const { return m_dev->atEnd() || m_dev->at() >= m_start + m_length; }
95private:
96 TQIODevice* m_dev;
97 TQ_ULONG m_start;
98 TQ_ULONG m_length;
99};
100
101#endif
KLimitedIODevice
A readonly device that reads from an underlying device from a given point to another (e....
Definition: klimitediodevice.h:32
KLimitedIODevice::KLimitedIODevice
KLimitedIODevice(TQIODevice *dev, int start, int length)
Creates a new KLimitedIODevice.
Definition: klimitediodevice.h:41

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