fbreader/src/formats/util/TextFormatDetector.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 <string.h>
  21
  22 #include <cctype>
  23 #include <algorithm>
  24
  25 #include <ZLInputStream.h>
  26
  27 #include "TextFormatDetector.h"
  28
  29 TextFormatDetector::TextFormatDetector() {
  30 }
  31
  32 TextFormatDetector::~TextFormatDetector() {
  33 }
  34
  35 bool TextFormatDetector::isHtml(ZLInputStream &stream) const {
  36         if (!stream.open()) {
  37                 return false;
  38         }
  39
  40         const size_t bufferSize = 1024;
  41         char *buffer = new char[bufferSize];
  42         char sixBytes[7];
  43         memset(sixBytes, 0, 7);
  44         int valuableBytesCounter = 0;
  45         bool skipFlag = true;
  46         while (valuableBytesCounter < 6) {
  47                 size_t size = stream.read(buffer, bufferSize);
  48                 if (size == 0) {
  49                         break;
  50                 }
  51                 size_t index;
  52                 for (index = 0; skipFlag && (index < size); ++index) {
  53                         if (!isspace((unsigned char)buffer[index])) {
  54                                 skipFlag = false;
  55                                 break;
  56                         }
  57                 }
  58                 if (!skipFlag && (index < size)) {
  59                         int bytes = std::min(6 - valuableBytesCounter, (int)(size - index));
  60                         memcpy(sixBytes, buffer + index, bytes);
  61                         valuableBytesCounter += bytes;
  62                 }
  63         }
  64         stream.close();
  65         delete[] buffer;
  66         return strcasecmp(sixBytes, "<html>") == 0;
  67 }
  68
  69 bool TextFormatDetector::isPPL(ZLInputStream &stream) const {
  70         if (!stream.open()) {
  71                 return false;
  72         }
  73
  74         char buffer[5];
  75         bool result = (stream.read(buffer, 5) == 5) && (strncmp(buffer, "PPL\r\n", 5) == 0);
  76         stream.close();
  77         return result;
  78 }