| 1 | /* This file is part of the KDE libraries |
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| 2 | SPDX-FileCopyrightText: 2001, 2002, 2007 David Faure <faure@kde.org> |
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| 3 | |
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| 4 | SPDX-License-Identifier: LGPL-2.0-or-later |
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| 5 | */ |
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| 6 | |
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| 7 | #include "klimitediodevice_p.h" |
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| 8 | #include "loggingcategory.h" |
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| 9 | |
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| 10 | #ifdef TEST_MODE |
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| 11 | #define WARNING qWarning() |
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| 12 | #else |
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| 13 | #define WARNING qCWarning(KArchiveLog) |
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| 14 | #endif |
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| 15 | |
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| 16 | KLimitedIODevice::KLimitedIODevice(QIODevice *dev, qint64 start, qint64 length) |
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| 17 | : m_dev(dev) |
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| 18 | , m_start(start) |
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| 19 | , m_length(length) |
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| 20 | { |
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| 21 | // qCDebug(KArchiveLog) << "start=" << start << "length=" << length; |
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| 22 | |
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| 23 | const bool res = open(m: QIODevice::ReadOnly); // krazy:exclude=syscalls |
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| 24 | |
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| 25 | // KLimitedIODevice always returns true |
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| 26 | Q_ASSERT(res); |
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| 27 | |
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| 28 | if(!res) { |
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| 29 | WARNING << "failed to open LimitedIO device for reading." ; |
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| 30 | } |
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| 31 | } |
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| 32 | |
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| 33 | bool KLimitedIODevice::open(QIODevice::OpenMode m) |
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| 34 | { |
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| 35 | // qCDebug(KArchiveLog) << "m=" << m; |
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| 36 | if (m & QIODevice::ReadOnly) { |
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| 37 | /*bool ok = false; |
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| 38 | if ( m_dev->isOpen() ) |
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| 39 | ok = ( m_dev->mode() == QIODevice::ReadOnly ); |
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| 40 | else |
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| 41 | ok = m_dev->open( m ); |
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| 42 | if ( ok )*/ |
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| 43 | m_dev->seek(pos: m_start); // No concurrent access ! |
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| 44 | } else { |
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| 45 | WARNING << "KLimitedIODevice::open only supports QIODevice::ReadOnly!" ; |
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| 46 | } |
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| 47 | setOpenMode(QIODevice::ReadOnly); |
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| 48 | return true; |
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| 49 | } |
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| 50 | |
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| 51 | void KLimitedIODevice::close() |
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| 52 | { |
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| 53 | } |
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| 54 | |
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| 55 | qint64 KLimitedIODevice::size() const |
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| 56 | { |
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| 57 | return m_length; |
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| 58 | } |
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| 59 | |
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| 60 | qint64 KLimitedIODevice::readData(char *data, qint64 maxlen) |
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| 61 | { |
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| 62 | maxlen = qMin(a: maxlen, b: m_length - pos()); // Apply upper limit |
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| 63 | return m_dev->read(data, maxlen); |
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| 64 | } |
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| 65 | |
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| 66 | bool KLimitedIODevice::seek(qint64 pos) |
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| 67 | { |
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| 68 | Q_ASSERT(pos <= m_length); |
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| 69 | pos = qMin(a: pos, b: m_length); // Apply upper limit |
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| 70 | bool ret = m_dev->seek(pos: m_start + pos); |
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| 71 | if (ret) { |
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| 72 | QIODevice::seek(pos); |
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| 73 | } |
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| 74 | return ret; |
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| 75 | } |
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| 76 | |
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| 77 | qint64 KLimitedIODevice::bytesAvailable() const |
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| 78 | { |
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| 79 | return QIODevice::bytesAvailable(); |
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| 80 | } |
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| 81 | |
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| 82 | bool KLimitedIODevice::isSequential() const |
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| 83 | { |
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| 84 | return m_dev->isSequential(); |
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| 85 | } |
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| 86 | |
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| 87 | #include "moc_klimitediodevice_p.cpp" |
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| 88 | |
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