fbreader/src/formats/rtf/RtfImage.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 <ZLStringUtil.h>
  21 #include <ZLInputStream.h>
  22 #include <ZLFile.h>
  23
  24 #include "RtfImage.h"
  25
  26 inline static char convertXDigit(char d) {
  27         if (isdigit(d)) {
  28                 return d - '0';
  29         } else if (islower(d)) {
  30                 return d - 'a' + 10;
  31         } else {
  32                 return d - 'A' + 10;
  33         }
  34 }
  35
  36 void RtfImage::read() const {
  37         shared_ptr<ZLInputStream> stream = ZLFile(myFileName).inputStream();
  38         if (!stream.isNull() && stream->open()) {
  39                 myData = new std::string();
  40                 myData->reserve(myLength / 2);
  41                 stream->seek(myStartOffset, false);
  42                 const size_t bufferSize = 1024;
  43                 char *buffer = new char[bufferSize];
  44                 for (unsigned int i = 0; i < myLength; i += bufferSize) {
  45                         size_t toRead = std::min(bufferSize, myLength - i);
  46                         if (stream->read(buffer, toRead) != toRead) {
  47                                 break;
  48                         }
  49                         for (size_t j = 0; j < toRead; j += 2) {
  50                                 *myData += (convertXDigit(buffer[j]) << 4) + convertXDigit(buffer[j + 1]);
  51                         }
  52                 }
  53                 delete[] buffer;
  54                 stream->close();
  55         }
  56 }
  57
  58 const shared_ptr<std::string> RtfImage::stringData() const {
  59         if (myData.isNull()) {
  60                 read();
  61         }
  62         return myData;
  63 }