fbreader/src/formats/pdb/PluckerImages.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 #include <ZLInputStream.h>
  22 #include <ZLZDecompressor.h>
  23 #include <ZLStringUtil.h>
  24
  25 #include "PluckerImages.h"
  26 #include "DocDecompressor.h"
  27
  28 const shared_ptr<std::string> ZCompressedFileImage::stringData() const {
  29         shared_ptr<ZLInputStream> stream = ZLFile(myPath).inputStream();
  30
  31         shared_ptr<std::string> imageData = new std::string();
  32
  33         if (!stream.isNull() && stream->open()) {
  34                 stream->seek(myOffset, false);
  35                 ZLZDecompressor decompressor(myCompressedSize);
  36
  37                 static const size_t charBufferSize = 2048;
  38                 char *charBuffer = new char[charBufferSize];
  39                 std::vector<std::string> buffer;
  40
  41                 size_t s;
  42                 do {
  43                         s = decompressor.decompress(*stream, charBuffer, charBufferSize);
  44                         if (s != 0) {
  45                                 buffer.push_back(std::string());
  46                                 buffer.back().append(charBuffer, s);
  47                         }
  48                 } while (s == charBufferSize);
  49                 ZLStringUtil::append(*imageData, buffer);
  50
  51                 delete[] charBuffer;
  52         }
  53
  54         return imageData;
  55 }
  56
  57 const shared_ptr<std::string> DocCompressedFileImage::stringData() const {
  58         shared_ptr<ZLInputStream> stream = ZLFile(myPath).inputStream();
  59
  60         shared_ptr<std::string> imageData = new std::string();
  61
  62         if (!stream.isNull() && stream->open()) {
  63                 stream->seek(myOffset, false);
  64                 char *buffer = new char[65535];
  65                 size_t uncompressedSize = DocDecompressor().decompress(*stream, buffer, myCompressedSize, 65535);
  66                 imageData->append(buffer, uncompressedSize);
  67                 delete[] buffer;
  68         }
  69
  70         return imageData;
  71 }
  72
  73 shared_ptr<const ZLImage> PluckerMultiImage::subImage(unsigned int row, unsigned int column) const {
  74         unsigned int index = row * myColumns + column;
  75         if (index >= myIds.size()) {
  76                 return 0;
  77         }
  78         ZLImageMap::const_iterator entry = myImageMap.find(myIds[index]);
  79         return (entry != myImageMap.end()) ? entry->second : 0;
  80 }