/*
 * This file is part of the KFTPGrabber project
 *
 * Copyright (C) 2003-2005 by the KFTPGrabber developers
 * Copyright (C) 2003-2005 Jernej Kos <kostko@jweb-network.net>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * is provided AS IS, WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, and
 * NON-INFRINGEMENT.  See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Steet, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 *
 * In addition, as a special exception, the copyright holders give
 * permission to link the code of portions of this program with the
 * OpenSSL library under certain conditions as described in each
 * individual source file, and distribute linked combinations
 * including the two.
 *
 * You must obey the GNU General Public License in all respects
 * for all of the code used other than OpenSSL.  If you modify
 * file(s) with this exception, you may extend this exception to your
 * version of the file(s), but you are not obligated to do so.  If you
 * do not wish to do so, delete this exception statement from your
 * version.  If you delete this exception statement from all source
 * files in the program, then also delete it here.
 */

#include "checksumverifier.h"

#include <qfile.h>
#include <qdir.h>
#include <qapplication.h>

#include <stdio.h>

#include <kmdcodec.h>
#include <kurl.h>

namespace KFTPCore {

ChecksumVerifierThread::ChecksumVerifierThread(ChecksumVerifier *verifier)
  : QThread(),
    m_verifier(verifier)
{
}

void ChecksumVerifierThread::run()
{
  switch (m_verifier->m_type) {
    case ChecksumVerifier::CheckMd5: break;
    case ChecksumVerifier::CheckSfv: checkSFV(m_verifier->m_filename); break;
  }
}


void ChecksumVerifierThread::checkSFV(const QString &sfvfile, const QString &fileToCheck)
{
  QString fileDir = KURL(sfvfile).directory(false);
  QDir fileSystem;
  QFile file(sfvfile);
  if (!file.open(IO_ReadOnly)) {
    // Dispatch the event that we have failed the verification
    ChecksumVerifierThreadEvent *e = new ChecksumVerifierThreadEvent(2);
    qApp->postEvent(m_verifier, e);
    return;
  }

  QValueList<QPair<QString, QString> > fileList;
  while (!file.atEnd()) {
    QString line;
    file.readLine(line, 1024);
    line = line.simplifyWhiteSpace();

    // Check if the line is a comment or a blank line (<3 chars)
    if (line[0] == ';' || line.length() < 3)
      continue;

    // filename.r00 C46D96FF
    QString fileName = line.section(' ', 0, 0);
    QString checksum = line.section(' ', 1, 1);
    checksum = checksum.lower();
    
    if (checksum.length() != 8) {
      // Dispatch the event that we have failed the verification
      ChecksumVerifierThreadEvent *e = new ChecksumVerifierThreadEvent(2);
      qApp->postEvent(m_verifier, e);
      file.close();
      return;
    }

    if (fileToCheck != QString::null && fileName != fileToCheck)
      continue;

    fileList.append(QPair<QString, QString>(fileName, checksum));
  }
  file.close();
  
  // Dispatch the event that we have the list
  ChecksumVerifierThreadEvent *e = new ChecksumVerifierThreadEvent(fileList);
  qApp->postEvent(m_verifier, e);
  
  // Check the obtained checksums
  int done = 0;
  for (QValueList<QPair<QString, QString> >::iterator i = fileList.begin(); i != fileList.end(); ++i) {
    if (!fileSystem.exists(fileDir + (*i).first)) {
      ChecksumVerifierThreadEvent *e = new ChecksumVerifierThreadEvent((*i).first, ChecksumVerifier::NotFound);
      qApp->postEvent(m_verifier, e);
      
      e = new ChecksumVerifierThreadEvent(3, (++done * 100) / fileList.count());
      qApp->postEvent(m_verifier, e);
      continue;
    }
    
    long l_fileCRC = getFileCRC(QString(fileDir + (*i).first).ascii());
    QString fileCRC;
    fileCRC.sprintf("%08lX", l_fileCRC);
    fileCRC = fileCRC.lower();
    
    ChecksumVerifierThreadEvent *e = new ChecksumVerifierThreadEvent((*i).first, fileCRC == (*i).second ? ChecksumVerifier::Ok : ChecksumVerifier::Error);
    qApp->postEvent(m_verifier, e);
    
    e = new ChecksumVerifierThreadEvent(3, (++done * 100) / fileList.count());
    qApp->postEvent(m_verifier, e);
  }
}

inline long ChecksumVerifierThread::UpdateCRC(register unsigned long CRC, register char *buffer, register long count)
{
  unsigned long CRCTABLE[] = {
    0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
    0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
    0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
    0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
    0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
    0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
    0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
    0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
    0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
    0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
    0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
    0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
    0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
    0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
    0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
    0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
    0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
    0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
    0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
    0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
    0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
    0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
    0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
    0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
    0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
    0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
    0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
    0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
    0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
    0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
    0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
    0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
    0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
    0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
    0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
    0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
    0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
    0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
    0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
    0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
    0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
    0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
    0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
  };

  if (buffer && count) {
    do {
      CRC =
          ((CRC >> 8) & 0xFFFFFF) ^
          CRCTABLE[(unsigned char)((CRC & 0xff) ^
        *buffer++)];
    }
    while (--count);

  }
  return CRC;
}

long ChecksumVerifierThread::getFileCRC(const char *filename)
{
  register unsigned long crc = 0xffffffff;
  FILE *f;
  long totalread = 0;
  long localread;

  /*
  * Note: different buffer sizes may result in noticable
  * different performance depending on system, so feel
  * free to modify.
  */
#define BUFFERSIZE 65536*16
  char buffer[BUFFERSIZE];

  if ((f = fopen(filename, "rb")) != NULL) {
    do {
      if ((localread = fread(buffer, 1, BUFFERSIZE, f))) {
        crc = UpdateCRC(crc, buffer, localread);
        totalread = totalread + localread;
      }
    }
    while (localread > 0);
    fclose(f);

    crc = crc ^ 0xffffffff;
  } else {
    return -1;
  }

  return crc;
#undef BUFFERSIZE
}

ChecksumVerifier::ChecksumVerifier(const QString &filename, Type type)
  : QObject(),
    m_filename(filename),
    m_type(type),
    m_thread(0)
{
}

ChecksumVerifier::~ChecksumVerifier()
{
  if (m_thread) {
    m_thread->terminate();
    m_thread->wait();
    
    delete m_thread;
  }
}

void ChecksumVerifier::verify()
{
  m_thread = new ChecksumVerifierThread(this);
  m_thread->start();
}

void ChecksumVerifier::customEvent(QCustomEvent *e)
{
  if (e->type() == CV_THR_EVENT_ID) {
    ChecksumVerifierThreadEvent *ev = static_cast<ChecksumVerifierThreadEvent*>(e);
    
    switch (ev->m_type) {
      case 0: emit fileDone(ev->m_filename, ev->m_result); break;
      case 1: emit fileList(ev->m_list); break;
      case 2: emit error(); break;
      case 3: emit progress(ev->m_progress); break;
    }
  }
}

}

#include "checksumverifier.moc"

