| 1 | // SPDX-FileCopyrightText: 2008 by Jakub Stachowski <qbast@go2.pl> |
|---|---|
| 2 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 3 | |
| 4 | #include "pdb_p.h" |
| 5 | |
| 6 | #include <QIODevice> |
| 7 | #include <QtEndian> |
| 8 | |
| 9 | namespace Mobipocket |
| 10 | { |
| 11 | |
| 12 | struct PDBPrivate { |
| 13 | PDBPrivate(QIODevice *dev); |
| 14 | |
| 15 | QIODevice *device; |
| 16 | QByteArray fileType; |
| 17 | QList<quint32> recordOffsets; |
| 18 | bool valid = false; |
| 19 | }; |
| 20 | |
| 21 | PDBPrivate::PDBPrivate(QIODevice *dev) |
| 22 | : device(dev) |
| 23 | { |
| 24 | const auto pdbHead = device->read(maxlen: 0x4e); |
| 25 | if (pdbHead.size() < 0x4e) |
| 26 | return; |
| 27 | |
| 28 | fileType = pdbHead.mid(index: 0x3c, len: 8); |
| 29 | |
| 30 | const auto nrecords = qFromBigEndian<quint16>(src: pdbHead.constData() + 0x4c); |
| 31 | const auto recordData = device->read(maxlen: 8 * nrecords); |
| 32 | if (recordData.size() < 8 * nrecords) |
| 33 | return; |
| 34 | |
| 35 | quint32 lastOffset = 0x4d + 8 * nrecords; |
| 36 | for (int i = 0; i < nrecords; i++) { |
| 37 | const quint32 offset = qFromBigEndian<quint32>(src: recordData.constData() + 8 * i); |
| 38 | if (offset < lastOffset) { |
| 39 | return; |
| 40 | } |
| 41 | if (offset > dev->size()) { |
| 42 | break; |
| 43 | } |
| 44 | recordOffsets.append(t: offset); |
| 45 | lastOffset = offset; |
| 46 | } |
| 47 | valid = true; |
| 48 | } |
| 49 | |
| 50 | PDB::~PDB() = default; |
| 51 | |
| 52 | PDB::PDB(QIODevice *device) |
| 53 | : d(new PDBPrivate(device)) |
| 54 | { |
| 55 | } |
| 56 | |
| 57 | QByteArray PDB::getRecord(quint16 i) const |
| 58 | { |
| 59 | if (i >= d->recordOffsets.size()) { |
| 60 | return QByteArray(); |
| 61 | } |
| 62 | |
| 63 | quint32 offset = d->recordOffsets[i]; |
| 64 | quint32 end = (i + 1 < d->recordOffsets.size()) ? d->recordOffsets[i + 1] : d->device->size(); |
| 65 | |
| 66 | if (!d->device->seek(pos: offset)) |
| 67 | return QByteArray(); |
| 68 | |
| 69 | return d->device->read(maxlen: end - offset); |
| 70 | } |
| 71 | |
| 72 | QByteArray PDB::fileType() const |
| 73 | { |
| 74 | return d->fileType; |
| 75 | } |
| 76 | |
| 77 | bool PDB::isValid() const |
| 78 | { |
| 79 | return d->valid; |
| 80 | } |
| 81 | |
| 82 | quint16 PDB::recordCount() const |
| 83 | { |
| 84 | // Range guaranteed by constructor/PDB field size |
| 85 | return d->recordOffsets.size(); |
| 86 | } |
| 87 | |
| 88 | } |
| 89 |