/*
Copyright (C) 2005-2014 Sergey A. Tachenov

This file is part of QuaZIP.

QuaZIP is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 2.1 of the License, or
(at your option) any later version.

QuaZIP is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with QuaZIP.  If not, see <http://www.gnu.org/licenses/>.

See COPYING file for the full LGPL text.

Original ZIP package is copyrighted by Gilles Vollant, see
quazip/(un)zip.h files for details, basically it's zlib license.
 **/

#include "quazipfile.h"

using namespace std;

/// The implementation class for QuaZip.
/**
\internal

This class contains all the private stuff for the QuaZipFile class, thus
allowing to preserve binary compatibility between releases, the
technique known as the Pimpl (private implementation) idiom.
*/
class QuaZipFilePrivate {
  friend class QuaZipFile;
  private:
    Q_DISABLE_COPY(QuaZipFilePrivate)
    /// The pointer to the associated QuaZipFile instance.
    QuaZipFile *q;
    /// The QuaZip object to work with.
    QuaZip *zip;
    /// The file name.
    QString fileName;
    /// Case sensitivity mode.
    QuaZip::CaseSensitivity caseSensitivity;
    /// Whether this file is opened in the raw mode.
    bool raw;
    /// Write position to keep track of.
    /**
      QIODevice::pos() is broken for non-seekable devices, so we need
      our own position.
      */
    qint64 writePos;
    /// Uncompressed size to write along with a raw file.
    quint64 uncompressedSize;
    /// CRC to write along with a raw file.
    quint32 crc;
    /// Whether \ref zip points to an internal QuaZip instance.
    /**
      This is true if the archive was opened by name, rather than by
      supplying an existing QuaZip instance.
      */
    bool internal;
    /// The last error.
    int zipError;
    /// Resets \ref zipError.
    inline void resetZipError() const {setZipError(UNZ_OK);}
    /// Sets the zip error.
    /**
      This function is marked as const although it changes one field.
      This allows to call it from const functions that don't change
      anything by themselves.
      */
    void setZipError(int zipError) const;
    /// The constructor for the corresponding QuaZipFile constructor.
    inline QuaZipFilePrivate(QuaZipFile *q):
      q(q),
      zip(NULL),
      caseSensitivity(QuaZip::csDefault),
      raw(false),
      writePos(0),
      uncompressedSize(0),
      crc(0),
      internal(true),
      zipError(UNZ_OK) {}
    /// The constructor for the corresponding QuaZipFile constructor.
    inline QuaZipFilePrivate(QuaZipFile *q, const QString &zipName):
      q(q),
      caseSensitivity(QuaZip::csDefault),
      raw(false),
      writePos(0),
      uncompressedSize(0),
      crc(0),
      internal(true),
      zipError(UNZ_OK)
      {
        zip=new QuaZip(zipName);
      }
    /// The constructor for the corresponding QuaZipFile constructor.
    inline QuaZipFilePrivate(QuaZipFile *q, const QString &zipName, const QString &fileName,
        QuaZip::CaseSensitivity cs):
      q(q),
      raw(false),
      writePos(0),
      uncompressedSize(0),
      crc(0),
      internal(true),
      zipError(UNZ_OK)
      {
        zip=new QuaZip(zipName);
        this->fileName=fileName;
        if (this->fileName.startsWith('/'))
            this->fileName = this->fileName.mid(1);
        this->caseSensitivity=cs;
      }
    /// The constructor for the QuaZipFile constructor accepting a file name.
    inline QuaZipFilePrivate(QuaZipFile *q, QuaZip *zip):
      q(q),
      zip(zip),
      raw(false),
      writePos(0),
      uncompressedSize(0),
      crc(0),
      internal(false),
      zipError(UNZ_OK) {}
    /// The destructor.
    inline ~QuaZipFilePrivate()
    {
      if (internal)
        delete zip;
    }
};

QuaZipFile::QuaZipFile():
  p(new QuaZipFilePrivate(this))
{
}

QuaZipFile::QuaZipFile(QObject *parent):
  QIODevice(parent),
  p(new QuaZipFilePrivate(this))
{
}

QuaZipFile::QuaZipFile(const QString& zipName, QObject *parent):
  QIODevice(parent),
  p(new QuaZipFilePrivate(this, zipName))
{
}

QuaZipFile::QuaZipFile(const QString& zipName, const QString& fileName,
    QuaZip::CaseSensitivity cs, QObject *parent):
  QIODevice(parent),
  p(new QuaZipFilePrivate(this, zipName, fileName, cs))
{
}

QuaZipFile::QuaZipFile(QuaZip *zip, QObject *parent):
  QIODevice(parent),
  p(new QuaZipFilePrivate(this, zip))
{
}

QuaZipFile::~QuaZipFile()
{
  if (isOpen())
    close();
  delete p;
}

QString QuaZipFile::getZipName() const
{
  return p->zip==NULL ? QString() : p->zip->getZipName();
}

QuaZip *QuaZipFile::getZip() const
{
    return p->internal ? NULL : p->zip;
}

QString QuaZipFile::getActualFileName()const
{
  p->setZipError(UNZ_OK);
  if (p->zip == NULL || (openMode() & WriteOnly))
    return QString();
  QString name=p->zip->getCurrentFileName();
  if(name.isNull())
    p->setZipError(p->zip->getZipError());
  return name;
}

void QuaZipFile::setZipName(const QString& zipName)
{
  if(isOpen()) {
    qWarning("QuaZipFile::setZipName(): file is already open - can not set ZIP name");
    return;
  }
  if(p->zip!=NULL && p->internal)
    delete p->zip;
  p->zip=new QuaZip(zipName);
  p->internal=true;
}

void QuaZipFile::setZip(QuaZip *zip)
{
  if(isOpen()) {
    qWarning("QuaZipFile::setZip(): file is already open - can not set ZIP");
    return;
  }
  if(p->zip!=NULL && p->internal)
    delete p->zip;
  p->zip=zip;
  p->fileName=QString();
  p->internal=false;
}

void QuaZipFile::setFileName(const QString& fileName, QuaZip::CaseSensitivity cs)
{
  if(p->zip==NULL) {
    qWarning("QuaZipFile::setFileName(): call setZipName() first");
    return;
  }
  if(!p->internal) {
    qWarning("QuaZipFile::setFileName(): should not be used when not using internal QuaZip");
    return;
  }
  if(isOpen()) {
    qWarning("QuaZipFile::setFileName(): can not set file name for already opened file");
    return;
  }
  p->fileName=fileName;
  if (p->fileName.startsWith('/'))
      p->fileName = p->fileName.mid(1);
  p->caseSensitivity=cs;
}

void QuaZipFilePrivate::setZipError(int zipError) const
{
  QuaZipFilePrivate *fakeThis = const_cast<QuaZipFilePrivate*>(this); // non-const
  fakeThis->zipError=zipError;
  if(zipError==UNZ_OK)
    q->setErrorString(QString());
  else
    q->setErrorString(QuaZipFile::tr("ZIP/UNZIP API error %1").arg(zipError));
}

bool QuaZipFile::open(OpenMode mode)
{
  return open(mode, NULL);
}

bool QuaZipFile::open(OpenMode mode, int *method, int *level, bool raw, const char *password)
{
  p->resetZipError();
  if(isOpen()) {
    qWarning("QuaZipFile::open(): already opened");
    return false;
  }
  if(mode&Unbuffered) {
    qWarning("QuaZipFile::open(): Unbuffered mode is not supported");
    return false;
  }
  if((mode&ReadOnly)&&!(mode&WriteOnly)) {
    if(p->internal) {
      if(!p->zip->open(QuaZip::mdUnzip)) {
        p->setZipError(p->zip->getZipError());
        return false;
      }
      if(!p->zip->setCurrentFile(p->fileName, p->caseSensitivity)) {
        p->setZipError(p->zip->getZipError());
        p->zip->close();
        return false;
      }
    } else {
      if(p->zip==NULL) {
        qWarning("QuaZipFile::open(): zip is NULL");
        return false;
      }
      if(p->zip->getMode()!=QuaZip::mdUnzip) {
        qWarning("QuaZipFile::open(): file open mode %d incompatible with ZIP open mode %d",
            (int)mode, (int)p->zip->getMode());
        return false;
      }
      if(!p->zip->hasCurrentFile()) {
        qWarning("QuaZipFile::open(): zip does not have current file");
        return false;
      }
    }
    p->setZipError(unzOpenCurrentFile3(p->zip->getUnzFile(), method, level, (int)raw, password));
    if(p->zipError==UNZ_OK) {
      setOpenMode(mode);
      p->raw=raw;
      return true;
    } else
      return false;
  }
  qWarning("QuaZipFile::open(): open mode %d not supported by this function", (int)mode);
  return false;
}

bool QuaZipFile::open(OpenMode mode, const QuaZipNewInfo& info,
    const char *password, quint32 crc,
    int method, int level, bool raw,
    int windowBits, int memLevel, int strategy)
{
  zip_fileinfo info_z;
  p->resetZipError();
  if(isOpen()) {
    qWarning("QuaZipFile::open(): already opened");
    return false;
  }
  if((mode&WriteOnly)&&!(mode&ReadOnly)) {
    if(p->internal) {
      qWarning("QuaZipFile::open(): write mode is incompatible with internal QuaZip approach");
      return false;
    }
    if(p->zip==NULL) {
      qWarning("QuaZipFile::open(): zip is NULL");
      return false;
    }
    if(p->zip->getMode()!=QuaZip::mdCreate&&p->zip->getMode()!=QuaZip::mdAppend&&p->zip->getMode()!=QuaZip::mdAdd) {
      qWarning("QuaZipFile::open(): file open mode %d incompatible with ZIP open mode %d",
          (int)mode, (int)p->zip->getMode());
      return false;
    }
    info_z.tmz_date.tm_year=info.dateTime.date().year();
    info_z.tmz_date.tm_mon=info.dateTime.date().month() - 1;
    info_z.tmz_date.tm_mday=info.dateTime.date().day();
    info_z.tmz_date.tm_hour=info.dateTime.time().hour();
    info_z.tmz_date.tm_min=info.dateTime.time().minute();
    info_z.tmz_date.tm_sec=info.dateTime.time().second();
    info_z.dosDate = 0;
    info_z.internal_fa=(uLong)info.internalAttr;
    info_z.external_fa=(uLong)info.externalAttr;
    if (p->zip->isDataDescriptorWritingEnabled())
        zipSetFlags(p->zip->getZipFile(), ZIP_WRITE_DATA_DESCRIPTOR);
    else
        zipClearFlags(p->zip->getZipFile(), ZIP_WRITE_DATA_DESCRIPTOR);
    p->setZipError(zipOpenNewFileInZip3_64(p->zip->getZipFile(),
          p->zip->isUtf8Enabled()
            ? info.name.toUtf8().constData()
            : p->zip->getFileNameCodec()->fromUnicode(info.name).constData(),
          &info_z,
          info.extraLocal.constData(), info.extraLocal.length(),
          info.extraGlobal.constData(), info.extraGlobal.length(),
          p->zip->isUtf8Enabled()
            ? info.comment.toUtf8().constData()
            : p->zip->getCommentCodec()->fromUnicode(info.comment).constData(),
          method, level, (int)raw,
          windowBits, memLevel, strategy,
          password, (uLong)crc,
          p->zip->isZip64Enabled()));
    if(p->zipError==UNZ_OK) {
      p->writePos=0;
      setOpenMode(mode);
      p->raw=raw;
      if(raw) {
        p->crc=crc;
        p->uncompressedSize=info.uncompressedSize;
      }
      return true;
    } else
      return false;
  }
  qWarning("QuaZipFile::open(): open mode %d not supported by this function", (int)mode);
  return false;
}

bool QuaZipFile::isSequential()const
{
  return true;
}

qint64 QuaZipFile::pos()const
{
  if(p->zip==NULL) {
    qWarning("QuaZipFile::pos(): call setZipName() or setZip() first");
    return -1;
  }
  if(!isOpen()) {
    qWarning("QuaZipFile::pos(): file is not open");
    return -1;
  }
  if(openMode()&ReadOnly)
      // QIODevice::pos() is broken for sequential devices,
      // but thankfully bytesAvailable() returns the number of
      // bytes buffered, so we know how far ahead we are.
    return unztell64(p->zip->getUnzFile()) - QIODevice::bytesAvailable();
  else
    return p->writePos;
}

bool QuaZipFile::atEnd()const
{
  if(p->zip==NULL) {
    qWarning("QuaZipFile::atEnd(): call setZipName() or setZip() first");
    return false;
  }
  if(!isOpen()) {
    qWarning("QuaZipFile::atEnd(): file is not open");
    return false;
  }
  if(openMode()&ReadOnly)
      // the same problem as with pos()
    return QIODevice::bytesAvailable() == 0
        && unzeof(p->zip->getUnzFile())==1;
  else
    return true;
}

qint64 QuaZipFile::size()const
{
  if(!isOpen()) {
    qWarning("QuaZipFile::atEnd(): file is not open");
    return -1;
  }
  if(openMode()&ReadOnly)
    return p->raw?csize():usize();
  else
    return p->writePos;
}

qint64 QuaZipFile::csize()const
{
  unz_file_info64 info_z;
  p->setZipError(UNZ_OK);
  if(p->zip==NULL||p->zip->getMode()!=QuaZip::mdUnzip) return -1;
  p->setZipError(unzGetCurrentFileInfo64(p->zip->getUnzFile(), &info_z, NULL, 0, NULL, 0, NULL, 0));
  if(p->zipError!=UNZ_OK)
    return -1;
  return info_z.compressed_size;
}

qint64 QuaZipFile::usize()const
{
  unz_file_info64 info_z;
  p->setZipError(UNZ_OK);
  if(p->zip==NULL||p->zip->getMode()!=QuaZip::mdUnzip) return -1;
  p->setZipError(unzGetCurrentFileInfo64(p->zip->getUnzFile(), &info_z, NULL, 0, NULL, 0, NULL, 0));
  if(p->zipError!=UNZ_OK)
    return -1;
  return info_z.uncompressed_size;
}

bool QuaZipFile::getFileInfo(QuaZipFileInfo *info)
{
    QuaZipFileInfo64 info64;
    if (getFileInfo(&info64)) {
        info64.toQuaZipFileInfo(*info);
        return true;
    } else {
        return false;
    }
}

bool QuaZipFile::getFileInfo(QuaZipFileInfo64 *info)
{
    if(p->zip==NULL||p->zip->getMode()!=QuaZip::mdUnzip) return false;
    p->zip->getCurrentFileInfo(info);
    p->setZipError(p->zip->getZipError());
    return p->zipError==UNZ_OK;
}

void QuaZipFile::close()
{
  p->resetZipError();
  if(p->zip==NULL||!p->zip->isOpen()) return;
  if(!isOpen()) {
    qWarning("QuaZipFile::close(): file isn't open");
    return;
  }
  if(openMode()&ReadOnly)
    p->setZipError(unzCloseCurrentFile(p->zip->getUnzFile()));
  else if(openMode()&WriteOnly)
    if(isRaw()) p->setZipError(zipCloseFileInZipRaw64(p->zip->getZipFile(), p->uncompressedSize, p->crc));
    else p->setZipError(zipCloseFileInZip(p->zip->getZipFile()));
  else {
    qWarning("Wrong open mode: %d", (int)openMode());
    return;
  }
  if(p->zipError==UNZ_OK) setOpenMode(QIODevice::NotOpen);
  else return;
  if(p->internal) {
    p->zip->close();
    p->setZipError(p->zip->getZipError());
  }
}

qint64 QuaZipFile::readData(char *data, qint64 maxSize)
{
  p->setZipError(UNZ_OK);
  qint64 bytesRead=unzReadCurrentFile(p->zip->getUnzFile(), data, (unsigned)maxSize);
  if (bytesRead < 0) {
    p->setZipError((int) bytesRead);
    return -1;
  }
  return bytesRead;
}

qint64 QuaZipFile::writeData(const char* data, qint64 maxSize)
{
  p->setZipError(ZIP_OK);
  p->setZipError(zipWriteInFileInZip(p->zip->getZipFile(), data, (uint)maxSize));
  if(p->zipError!=ZIP_OK) return -1;
  else {
    p->writePos+=maxSize;
    return maxSize;
  }
}

QString QuaZipFile::getFileName() const
{
  return p->fileName;
}

QuaZip::CaseSensitivity QuaZipFile::getCaseSensitivity() const
{
  return p->caseSensitivity;
}

bool QuaZipFile::isRaw() const
{
  return p->raw;
}

int QuaZipFile::getZipError() const
{
  return p->zipError;
}

qint64 QuaZipFile::bytesAvailable() const
{
    return size() - pos();
}
