runtime/kioslave/filter/filter.cc

   1 /*
   2 This file is part of KDE
   3
   4  Copyright (C) 1999-2000 Waldo Bastian (bastian@kde.org)
   5  Copyright 2008 David Faure <faure@kde.org>
   6
   7 Permission is hereby granted, free of charge, to any person obtaining a copy
   8 of this software and associated documentation files (the "Software"), to deal
   9 in the Software without restriction, including without limitation the rights
  10 to use, copy, modify, merge, publish, distribute, and/or sell
  11 copies of the Software, and to permit persons to whom the Software is
  12 furnished to do so, subject to the following conditions:
  13
  14 The above copyright notice and this permission notice shall be included in
  15 all copies or substantial portions of the Software.
  16
  17 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  20 AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21 AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23 */
  24
  25 #include "filter.h"
  26 #include <QFileInfo>
  27 #include <QFile>
  28
  29 #include <kcomponentdata.h>
  30 #include <kdebug.h>
  31 #include <kmimetype.h>
  32 #include <kfilterbase.h>
  33 #include <kurl.h>
  34
  35 extern "C" { KDE_EXPORT int kdemain(int argc, char **argv); }
  36
  37 int kdemain( int argc, char ** argv)
  38 {
  39   KComponentData componentData( "kio_filter" );
  40
  41   kDebug(7110) << "Starting";
  42
  43   if (argc != 4)
  44   {
  45      fprintf(stderr, "Usage: kio_filter protocol domain-socket1 domain-socket2\n");
  46      exit(-1);
  47   }
  48
  49   FilterProtocol slave(argv[1], argv[2], argv[3]);
  50   slave.dispatchLoop();
  51
  52   kDebug(7110) << "Done";
  53   return 0;
  54 }
  55
  56 FilterProtocol::FilterProtocol( const QByteArray & protocol, const QByteArray &pool, const QByteArray &app )
  57  : KIO::SlaveBase( protocol, pool, app )
  58 {
  59     QString mimetype = QString::fromLatin1("application/x-") + QString::fromLatin1(protocol);
  60     filter = KFilterBase::findFilterByMimeType( mimetype );
  61     Q_ASSERT(filter);
  62 }
  63
  64 void FilterProtocol::get(const KUrl& url)
  65 {
  66     // In the old solution, subURL would be set by setSubURL.
  67     // KDE4: now I simply assume bzip2:/localpath/file.bz2 and set subURL to the local path.
  68     subURL = url;
  69     subURL.setProtocol("file");
  70
  71     if (subURL.isEmpty()) {
  72         error( KIO::ERR_NO_SOURCE_PROTOCOL, mProtocol );
  73         return;
  74     }
  75
  76     QFile localFile(url.path());
  77     if (!localFile.open(QIODevice::ReadOnly)) {
  78         error( KIO::ERR_COULD_NOT_READ, mProtocol );
  79         return;
  80     }
  81
  82     if (!filter) {
  83         // TODO better error message
  84         error( KIO::ERR_INTERNAL, mProtocol );
  85         return;
  86     }
  87
  88 #if 0
  89   needSubUrlData();
  90 #endif
  91
  92   filter->init(QIODevice::ReadOnly);
  93
  94   bool bNeedHeader = true;
  95   bool bNeedMimetype = true;
  96   bool bError = true;
  97   int result;
  98
  99   QByteArray inputBuffer;
 100   inputBuffer.resize(8*1024);
 101   QByteArray outputBuffer;
 102   outputBuffer.resize(8*1024); // Start with a modest buffer
 103   filter->setOutBuffer( outputBuffer.data(), outputBuffer.size() );
 104   while(true)
 105   {
 106      if (filter->inBufferEmpty())
 107      {
 108 #if 0
 109         dataReq(); // Request data
 110         result = readData( inputBuffer);
 111 #else
 112         result = localFile.read(inputBuffer.data(), inputBuffer.size());
 113 #endif
 114         kDebug(7110) << "requestData: got " << result;
 115         if (result <= 0)
 116         {
 117           bError = true;
 118           break; // Unexpected EOF.
 119         }
 120         filter->setInBuffer( inputBuffer.data(), inputBuffer.size() );
 121      }
 122      if (bNeedHeader)
 123      {
 124         bError = !filter->readHeader();
 125         if (bError)
 126             break;
 127         bNeedHeader = false;
 128      }
 129      result = filter->uncompress();
 130      if ((filter->outBufferAvailable() == 0) || (result == KFilterBase::End))
 131      {
 132          kDebug(7110) << "avail_out = " << filter->outBufferAvailable();
 133         if (filter->outBufferAvailable() != 0)
 134         {
 135             // Discard unused space :-)
 136             outputBuffer.resize(outputBuffer.size() - filter->outBufferAvailable());
 137         }
 138         if (bNeedMimetype) {
 139             // Can we use the "base" filename? E.g. foo.txt.bz2
 140             const QString extension = QFileInfo(subURL.path()).suffix();
 141             KMimeType::Ptr mime;
 142             if (extension == "gz" || extension == "bz" || extension == "bz2") {
 143                 QString baseName = subURL.path();
 144                 baseName.truncate(baseName.length() - extension.length() - 1 /*the dot*/);
 145                 kDebug(7110) << "baseName=" << baseName;
 146                 mime = KMimeType::findByNameAndContent(baseName, outputBuffer);
 147             } else {
 148                 mime = KMimeType::findByContent(outputBuffer);
 149             }
 150             kDebug(7110) << "Emitting mimetype " << mime->name();
 151             mimeType( mime->name() );
 152             bNeedMimetype = false;
 153         }
 154         data( outputBuffer ); // Send data
 155         filter->setOutBuffer( outputBuffer.data(), outputBuffer.size() );
 156         if (result == KFilterBase::End)
 157            break; // Finished.
 158      }
 159      if (result != KFilterBase::Ok)
 160      {
 161         bError = true;
 162         break; // Error
 163      }
 164   }
 165
 166     if (!bError) {
 167 #if 0
 168         dataReq(); // Request data
 169         result = readData( inputBuffer);
 170 #else
 171         result = localFile.read(inputBuffer.data(), inputBuffer.size());
 172 #endif
 173         kDebug(7110) << "requestData: got" << result << "(expecting 0)";
 174         data(QByteArray()); // Send EOF
 175     }
 176
 177     filter->terminate();
 178
 179     if (bError) {
 180         error(KIO::ERR_COULD_NOT_READ, subURL.url());
 181     } else {
 182         finished();
 183     }
 184     subURL = KUrl(); // Clear subURL
 185 }
 186
 187 #if 0
 188 void FilterProtocol::put( const KUrl &/*url*/, int, KIO::JobFlags /* _flags */ )
 189 {
 190   error( KIO::ERR_UNSUPPORTED_ACTION, QString::fromLatin1("put"));
 191 }
 192
 193 void FilterProtocol::setSubURL(const KUrl &url)
 194 {
 195    subURL = url;
 196 }
 197 #endif