member.pm

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

}

# Note, this isn't exactly UTC 1980, it's 1980 + 12 hours and 1
# minute so that nothing timezoney can muck us up.
my $safe_epoch = 315576060;

# convert a unix time to DOS date/time
# NOT AN OBJECT METHOD!
sub _unixToDosTime {
    my $time_t = shift;
    unless ($time_t) {
        _error("Tried to add member with zero or undef value for time");
        $time_t = $safe_epoch;
    }
    if ( $time_t < $safe_epoch ) {
        _ioError("Unsupported date before 1980 encountered, moving to 1980");
        $time_t = $safe_epoch;
    }
    my ( $sec, $min, $hour, $mday, $mon, $year ) = localtime($time_t);
    my $dt = 0;
    $dt += ( $sec >> 1 );
    $dt += ( $min << 5 );
    $dt += ( $hour << 11 );
    $dt += ( $mday << 16 );
    $dt += ( ( $mon + 1 ) << 21 );
    $dt += ( ( $year - 80 ) << 25 );
    return $dt;
}

# Write my local header to a file handle.
# Stores the offset to the start of the header in my
# writeLocalHeaderRelativeOffset member.
# Returns AZ_OK on success.
sub _writeLocalFileHeader {
    my $self = shift;
    my $fh   = shift;

    my $signatureData = pack( SIGNATURE_FORMAT, LOCAL_FILE_HEADER_SIGNATURE );
    $fh->print($signatureData)
      or return _ioError("writing local header signature");

    my $header = pack(
        LOCAL_FILE_HEADER_FORMAT,
        $self->versionNeededToExtract(),
        $self->bitFlag(),
        $self->desiredCompressionMethod(),
        $self->lastModFileDateTime(),
        $self->crc32(),
        $self->compressedSize(),    # may need to be re-written later
        $self->uncompressedSize(),
        length( $self->fileName() ),
        length( $self->localExtraField() )
    );

    $fh->print($header) or return _ioError("writing local header");
    if ( $self->fileName() ) {
        $fh->print( $self->fileName() )
          or return _ioError("writing local header filename");
    }
    if ( $self->localExtraField() ) {
        $fh->print( $self->localExtraField() )
          or return _ioError("writing local extra field");
    }

    return AZ_OK;
}

sub _writeCentralDirectoryFileHeader {
    my $self = shift;
    my $fh   = shift;

    my $sigData =
      pack( SIGNATURE_FORMAT, CENTRAL_DIRECTORY_FILE_HEADER_SIGNATURE );
    $fh->print($sigData)
      or return _ioError("writing central directory header signature");

    my $fileNameLength    = length( $self->fileName() );
    my $extraFieldLength  = length( $self->cdExtraField() );
    my $fileCommentLength = length( $self->fileComment() );

    my $header = pack(
        CENTRAL_DIRECTORY_FILE_HEADER_FORMAT,
        $self->versionMadeBy(),
        $self->fileAttributeFormat(),
        $self->versionNeededToExtract(),
        $self->bitFlag(),
        $self->desiredCompressionMethod(),
        $self->lastModFileDateTime(),
        $self->crc32(),            # these three fields should have been updated
        $self->_writeOffset(),     # by writing the data stream out
        $self->uncompressedSize(), #
        $fileNameLength,
        $extraFieldLength,
        $fileCommentLength,
        0,                         # {'diskNumberStart'},
        $self->internalFileAttributes(),
        $self->externalFileAttributes(),
        $self->writeLocalHeaderRelativeOffset()
    );

    $fh->print($header)
      or return _ioError("writing central directory header");
    if ($fileNameLength) {
        $fh->print( $self->fileName() )
          or return _ioError("writing central directory header signature");
    }
    if ($extraFieldLength) {
        $fh->print( $self->cdExtraField() )
          or return _ioError("writing central directory extra field");
    }
    if ($fileCommentLength) {
        $fh->print( $self->fileComment() )
          or return _ioError("writing central directory file comment");
    }

    return AZ_OK;
}

# This writes a data descriptor to the given file handle.
# Assumes that crc32, writeOffset, and uncompressedSize are
# set correctly (they should be after a write).
# Further, the local file header should have the
# GPBF_HAS_DATA_DESCRIPTOR_MASK bit set.
sub _writeDataDescriptor {
    my $self   = shift;
    my $fh     = shift;
    my $header = pack(
        SIGNATURE_FORMAT . DATA_DESCRIPTOR_FORMAT,
        DATA_DESCRIPTOR_SIGNATURE,
        $self->crc32(),
        $self->_writeOffset(),    # compressed size
        $self->uncompressedSize()
    );

    $fh->print($header)
      or return _ioError("writing data descriptor");
    return AZ_OK;
}

# Re-writes the local file header with new crc32 and compressedSize fields.
# To be called after writing the data stream.
# Assumes that filename and extraField sizes didn't change since last written.
sub _refreshLocalFileHeader {
    my $self = shift;
    my $fh   = shift;

    my $here = $fh->tell();
    $fh->seek( $self->writeLocalHeaderRelativeOffset() + SIGNATURE_LENGTH,
        IO::Seekable::SEEK_SET )
      or return _ioError("seeking to rewrite local header");

    my $header = pack(
        LOCAL_FILE_HEADER_FORMAT,
        $self->versionNeededToExtract(),
        $self->bitFlag(),
        $self->desiredCompressionMethod(),
        $self->lastModFileDateTime(),
        $self->crc32(),
        $self->_writeOffset(),    # compressed size
        $self->uncompressedSize(),
        length( $self->fileName() ),
        length( $self->localExtraField() )
    );

    $fh->print($header)
      or return _ioError("re-writing local header");
    $fh->seek( $here, IO::Seekable::SEEK_SET )
      or return _ioError("seeking after rewrite of local header");

    return AZ_OK;
}

sub readChunk {
    my ( $self, $chunkSize ) = @_;

    if ( $self->readIsDone() ) {
        $self->endRead();
        my $dummy = '';
        return ( \$dummy, AZ_STREAM_END );
    }

    $chunkSize = $Archive::Zip::ChunkSize if not defined($chunkSize);
    $chunkSize = $self->_readDataRemaining()
      if $chunkSize > $self->_readDataRemaining();

    my $buffer = '';
    my $outputRef;
    my ( $bytesRead, $status ) = $self->_readRawChunk( \$buffer, $chunkSize );
    return ( \$buffer, $status ) unless $status == AZ_OK;

    $self->{'readDataRemaining'} -= $bytesRead;
    $self->{'readOffset'} += $bytesRead;

    if ( $self->compressionMethod() == COMPRESSION_STORED ) {
        $self->{'crc32'} = $self->computeCRC32( $buffer, $self->{'crc32'} );
    }

    ( $outputRef, $status ) = &{ $self->{'chunkHandler'} }( $self, \$buffer );
    $self->{'writeOffset'} += length($$outputRef);

    $self->endRead()
      if $self->readIsDone();

    return ( $outputRef, $status );
}

# Read the next raw chunk of my data. Subclasses MUST implement.
#	my ( $bytesRead, $status) = $self->_readRawChunk( \$buffer, $chunkSize );
sub _readRawChunk {
    my $self = shift;
    return $self->_subclassResponsibility();
}

# A place holder to catch rewindData errors if someone ignores
# the error code.
sub _noChunk {
    my $self = shift;
    return ( \undef, _error("trying to copy chunk when init failed") );
}

# Basically a no-op so that I can have a consistent interface.
# ( $outputRef, $status) = $self->_copyChunk( \$buffer );
sub _copyChunk {
    my ( $self, $dataRef ) = @_;
    return ( $dataRef, AZ_OK );
}

# ( $outputRef, $status) = $self->_deflateChunk( \$buffer );
sub _deflateChunk {
    my ( $self, $buffer ) = @_;
    my ( $out,  $status ) = $self->_deflater()->deflate($buffer);

    if ( $self->_readDataRemaining() == 0 ) {
        my $extraOutput;
        ( $extraOutput, $status ) = $self->_deflater()->flush();
        $out .= $extraOutput;
        $self->endRead();
        return ( \$out, AZ_STREAM_END );
    }
    elsif ( $status == Z_OK ) {
        return ( \$out, AZ_OK );
    }
    else {
        $self->endRead();
        my $retval = _error( 'deflate error', $status );
        my $dummy = '';
        return ( \$dummy, $retval );
    }
}

# ( $outputRef, $status) = $self->_inflateChunk( \$buffer );
sub _inflateChunk {
    my ( $self, $buffer ) = @_;
    my ( $out,  $status ) = $self->_inflater()->inflate($buffer);
    my $retval;
    $self->endRead() unless $status == Z_OK;
    if ( $status == Z_OK || $status == Z_STREAM_END ) {
        $retval = ( $status == Z_STREAM_END ) ? AZ_STREAM_END: AZ_OK;
        return ( \$out, $retval );
    }
    else {
        $retval = _error( 'inflate error', $status );
        my $dummy = '';
        return ( \$dummy, $retval );
    }
}

sub rewindData {
    my $self = shift;
    my $status;

    # set to trap init errors
    $self->{'chunkHandler'} = $self->can('_noChunk');

    # Work around WinZip bug with 0-length DEFLATED files
    $self->desiredCompressionMethod(COMPRESSION_STORED)
      if $self->uncompressedSize() == 0;

    # assume that we're going to read the whole file, and compute the CRC anew.
    $self->{'crc32'} = 0
      if ( $self->compressionMethod() == COMPRESSION_STORED );

    # These are the only combinations of methods we deal with right now.
    if (    $self->compressionMethod() == COMPRESSION_STORED
        and $self->desiredCompressionMethod() == COMPRESSION_DEFLATED )
    {
        ( $self->{'deflater'}, $status ) = Compress::Zlib::deflateInit(
            '-Level'      => $self->desiredCompressionLevel(),
            '-WindowBits' => -MAX_WBITS(),                     # necessary magic
            '-Bufsize'    => $Archive::Zip::ChunkSize,
            @_
        );    # pass additional options
        return _error( 'deflateInit error:', $status )
          unless $status == Z_OK;
        $self->{'chunkHandler'} = $self->can('_deflateChunk');
    }
    elsif ( $self->compressionMethod() == COMPRESSION_DEFLATED
        and $self->desiredCompressionMethod() == COMPRESSION_STORED )
    {
        ( $self->{'inflater'}, $status ) = Compress::Zlib::inflateInit(
            '-WindowBits' => -MAX_WBITS(),               # necessary magic
            '-Bufsize'    => $Archive::Zip::ChunkSize,
            @_
        );    # pass additional options
        return _error( 'inflateInit error:', $status )
          unless $status == Z_OK;
        $self->{'chunkHandler'} = $self->can('_inflateChunk');
    }
    elsif ( $self->compressionMethod() == $self->desiredCompressionMethod() ) {
        $self->{'chunkHandler'} = $self->can('_copyChunk');
    }
    else {
        return _error(
            sprintf(
                "Unsupported compression combination: read %d, write %d",
                $self->compressionMethod(),
                $self->desiredCompressionMethod()
            )
        );
    }

    $self->{'readDataRemaining'} =
      ( $self->compressionMethod() == COMPRESSION_STORED )
      ? $self->uncompressedSize()
      : $self->compressedSize();
    $self->{'dataEnded'}  = 0;
    $self->{'readOffset'} = 0;

    return AZ_OK;
}

sub endRead {
    my $self = shift;
    delete $self->{'inflater'};
    delete $self->{'deflater'};
    $self->{'dataEnded'}         = 1;
    $self->{'readDataRemaining'} = 0;
    return AZ_OK;
}

sub readIsDone {
    my $self = shift;
    return ( $self->_dataEnded() or !$self->_readDataRemaining() );
}

sub contents {
    my $self        = shift;
    my $newContents = shift;

    if ( defined($newContents) ) {

        # change our type and call the subclass contents method.
        $self->_become(STRINGMEMBERCLASS);
        return $self->contents( pack( 'C0a*', $newContents ) )
          ;    # in case of Unicode
    }
    else {
        my $oldCompression =
          $self->desiredCompressionMethod(COMPRESSION_STORED);
        my $status = $self->rewindData(@_);
        if ( $status != AZ_OK ) {
            $self->endRead();
            return $status;
        }
        my $retval = '';
        while ( $status == AZ_OK ) {
            my $ref;
            ( $ref, $status ) = $self->readChunk( $self->_readDataRemaining() );

            # did we get it in one chunk?
            if ( length($$ref) == $self->uncompressedSize() ) {
                $retval = $$ref;
            }
            else { $retval .= $$ref }
        }
        $self->desiredCompressionMethod($oldCompression);
        $self->endRead();
        $status = AZ_OK if $status == AZ_STREAM_END;
        $retval = undef unless $status == AZ_OK;
        return wantarray ? ( $retval, $status ) : $retval;
    }
}

sub extractToFileHandle {
    my $self = shift;
    return _error("encryption unsupported") if $self->isEncrypted();
    my $fh = shift;
    _binmode($fh);
    my $oldCompression = $self->desiredCompressionMethod(COMPRESSION_STORED);
    my $status         = $self->rewindData(@_);
    $status = $self->_writeData($fh) if $status == AZ_OK;
    $self->desiredCompressionMethod($oldCompression);
    $self->endRead();
    return $status;
}

# write local header and data stream to file handle
sub _writeToFileHandle {
    my $self         = shift;
    my $fh           = shift;
    my $fhIsSeekable = shift;
    my $offset       = shift;

    return _error("no member name given for $self")
      unless $self->fileName();

    $self->{'writeLocalHeaderRelativeOffset'} = $offset;
    $self->{'wasWritten'}                     = 0;

    # Determine if I need to write a data descriptor
    # I need to do this if I can't refresh the header
    # and I don't know compressed size or crc32 fields.
    my $headerFieldsUnknown = (
        ( $self->uncompressedSize() > 0 )
          and ($self->compressionMethod() == COMPRESSION_STORED
            or $self->desiredCompressionMethod() == COMPRESSION_DEFLATED )
    );

    my $shouldWriteDataDescriptor =
      ( $headerFieldsUnknown and not $fhIsSeekable );

    $self->hasDataDescriptor(1)
      if ($shouldWriteDataDescriptor);

    $self->{'writeOffset'} = 0;

    my $status = $self->rewindData();
    ( $status = $self->_writeLocalFileHeader($fh) )
      if $status == AZ_OK;
    ( $status = $self->_writeData($fh) )
      if $status == AZ_OK;
    if ( $status == AZ_OK ) {
        $self->{'wasWritten'} = 1;
        if ( $self->hasDataDescriptor() ) {
            $status = $self->_writeDataDescriptor($fh);
        }
        elsif ($headerFieldsUnknown) {
            $status = $self->_refreshLocalFileHeader($fh);
        }
    }

    return $status;
}

# Copy my (possibly compressed) data to given file handle.
# Returns C<AZ_OK> on success
sub _writeData {
    my $self    = shift;
    my $writeFh = shift;

    return AZ_OK if ( $self->uncompressedSize() == 0 );
    my $status;
    my $chunkSize = $Archive::Zip::ChunkSize;
    while ( $self->_readDataRemaining() > 0 ) {
        my $outRef;
        ( $outRef, $status ) = $self->readChunk($chunkSize);
        return $status if ( $status != AZ_OK and $status != AZ_STREAM_END );

        if ( length($$outRef) > 0 ) {
            $writeFh->print($$outRef)
              or return _ioError("write error during copy");
        }

        last if $status == AZ_STREAM_END;
    }
    $self->{'compressedSize'} = $self->_writeOffset();
    return AZ_OK;
}

# Return true if I depend on the named file
sub _usesFileNamed {
    return 0;
}

1;