fbreader/src/formats/pdb/PdbReader.cpp

   1 /*
   2  * Copyright (C) 2004-2008 Geometer Plus <contact@geometerplus.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17  * 02110-1301, USA.
  18  */
  19
  20 #include <ZLFile.h>
  21
  22 #include "PdbReader.h"
  23 #include "../../bookmodel/BookModel.h"
  24 #include "../../bookmodel/BookReader.h"
  25
  26 void PdbUtil::readUnsignedShort(ZLInputStream &stream, unsigned short &N) {
  27         unsigned char data[2];
  28         stream.read((char*)data, 2);
  29         N = (((unsigned short)data[0]) << 8) + data[1];
  30         /*
  31         stream.read((char*)&N + 1, 1);
  32         stream.read((char*)&N, 1);
  33         */
  34 }
  35
  36 void PdbUtil::readUnsignedLong(ZLInputStream &stream, unsigned long &N) {
  37         unsigned char data[4];
  38         stream.read((char*)data, 4);
  39         N = (((unsigned long)data[0]) << 24) +
  40                         (((unsigned long)data[1]) << 16) +
  41                         (((unsigned long)data[2]) << 8) +
  42                         (unsigned long)data[3];
  43         /*
  44         stream.read((char*)&N + 3, 1);
  45         stream.read((char*)&N + 2, 1);
  46         stream.read((char*)&N + 1, 1);
  47         stream.read((char*)&N, 1);
  48         */
  49 }
  50
  51 bool PdbHeader::read(shared_ptr<ZLInputStream> stream) {
  52         size_t startOffset = stream->offset();
  53
  54         DocName.erase();
  55         DocName.append(32, '\0');
  56         stream->read((char*)DocName.data(), 32);
  57
  58         PdbUtil::readUnsignedShort(*stream, Flags);
  59
  60         stream->seek(26, false);
  61
  62         Id.erase();
  63         Id.append(8, '\0');
  64         stream->read((char*)Id.data(), 8);
  65
  66         stream->seek(8, false);
  67
  68         Offsets.clear();
  69         unsigned short numRecords;
  70         PdbUtil::readUnsignedShort(*stream, numRecords);
  71         Offsets.reserve(numRecords);
  72
  73         for (int i = 0; i < numRecords; ++i) {
  74                 unsigned long recordOffset;
  75                 PdbUtil::readUnsignedLong(*stream, recordOffset);
  76                 Offsets.push_back(recordOffset);
  77                 stream->seek(4, false);
  78         }
  79
  80         return stream->offset() == startOffset + 78 + 8 * numRecords;
  81 }