base.pm

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package IO::Compress::Base ;

require 5.004 ;

use strict ;
use warnings;

use IO::Compress::Base::Common 2.008 ;

use IO::File ;
use Scalar::Util qw(blessed readonly);

#use File::Glob;
#require Exporter ;
use Carp ;
use Symbol;
use bytes;

our (@ISA, $VERSION);
@ISA    = qw(Exporter IO::File);

$VERSION = '2.008';

#Can't locate object method "SWASHNEW" via package "utf8" (perhaps you forgot to load "utf8"?) at .../ext/Compress-Zlib/Gzip/blib/lib/Compress/Zlib/Common.pm line 16.

sub saveStatus
{
    my $self   = shift ;
    ${ *$self->{ErrorNo} } = shift() + 0 ;
    ${ *$self->{Error} } = '' ;

    return ${ *$self->{ErrorNo} } ;
}


sub saveErrorString
{
    my $self   = shift ;
    my $retval = shift ;
    ${ *$self->{Error} } = shift ;
    ${ *$self->{ErrorNo} } = shift() + 0 if @_ ;

    return $retval;
}

sub croakError
{
    my $self   = shift ;
    $self->saveErrorString(0, $_[0]);
    croak $_[0];
}

sub closeError
{
    my $self = shift ;
    my $retval = shift ;

    my $errno = *$self->{ErrorNo};
    my $error = ${ *$self->{Error} };

    $self->close();

    *$self->{ErrorNo} = $errno ;
    ${ *$self->{Error} } = $error ;

    return $retval;
}



sub error
{
    my $self   = shift ;
    return ${ *$self->{Error} } ;
}

sub errorNo
{
    my $self   = shift ;
    return ${ *$self->{ErrorNo} } ;
}


sub writeAt
{
    my $self = shift ;
    my $offset = shift;
    my $data = shift;

    if (defined *$self->{FH}) {
        my $here = tell(*$self->{FH});
        return $self->saveErrorString(undef, "Cannot seek to end of output filehandle: $!", $!) 
            if $here < 0 ;
        seek(*$self->{FH}, $offset, SEEK_SET)
            or return $self->saveErrorString(undef, "Cannot seek to end of output filehandle: $!", $!) ;
        defined *$self->{FH}->write($data, length $data)
            or return $self->saveErrorString(undef, $!, $!) ;
        seek(*$self->{FH}, $here, SEEK_SET)
            or return $self->saveErrorString(undef, "Cannot seek to end of output filehandle: $!", $!) ;
    }
    else {
        substr(${ *$self->{Buffer} }, $offset, length($data)) = $data ;
    }

    return 1;
}

sub output
{
    my $self = shift ;
    my $data = shift ;
    my $last = shift ;

    return 1 
        if length $data == 0 && ! $last ;

    if ( *$self->{FilterEnvelope} ) {
        *_ = \$data;
        &{ *$self->{FilterEnvelope} }();
    }

    if ( defined *$self->{FH} ) {
        defined *$self->{FH}->write( $data, length $data )
          or return $self->saveErrorString(0, $!, $!); 
    }
    else {
        ${ *$self->{Buffer} } .= $data ;
    }

    return 1;
}

sub getOneShotParams
{
    return ( 'MultiStream' => [1, 1, Parse_boolean,   1],
           );
}

sub checkParams
{
    my $self = shift ;
    my $class = shift ;

    my $got = shift || IO::Compress::Base::Parameters::new();

    $got->parse(
        {
            # Generic Parameters
            'AutoClose' => [1, 1, Parse_boolean,   0],
            #'Encode'    => [1, 1, Parse_any,       undef],
            'Strict'    => [0, 1, Parse_boolean,   1],
            'Append'    => [1, 1, Parse_boolean,   0],
            'BinModeIn' => [1, 1, Parse_boolean,   0],

            'FilterEnvelope' => [1, 1, Parse_any,   undef],

            $self->getExtraParams(),
            *$self->{OneShot} ? $self->getOneShotParams() 
                              : (),
        }, 
        @_) or $self->croakError("${class}: $got->{Error}")  ;

    return $got ;
}

sub _create
{
    my $obj = shift;
    my $got = shift;

    *$obj->{Closed} = 1 ;

    my $class = ref $obj;
    $obj->croakError("$class: Missing Output parameter")
        if ! @_ && ! $got ;

    my $outValue = shift ;
    my $oneShot = 1 ;

    if (! $got)
    {
        $oneShot = 0 ;
        $got = $obj->checkParams($class, undef, @_)
            or return undef ;
    }

    my $lax = ! $got->value('Strict') ;

    my $outType = whatIsOutput($outValue);

    $obj->ckOutputParam($class, $outValue)
        or return undef ;

    if ($outType eq 'buffer') {
        *$obj->{Buffer} = $outValue;
    }
    else {
        my $buff = "" ;
        *$obj->{Buffer} = \$buff ;
    }

    # Merge implies Append
    my $merge = $got->value('Merge') ;
    my $appendOutput = $got->value('Append') || $merge ;
    *$obj->{Append} = $appendOutput;
    *$obj->{FilterEnvelope} = $got->value('FilterEnvelope') ;

    if ($merge)
    {
        # Switch off Merge mode if output file/buffer is empty/doesn't exist
        if (($outType eq 'buffer' && length $$outValue == 0 ) ||
            ($outType ne 'buffer' && (! -e $outValue || (-w _ && -z _))) )
          { $merge = 0 }
    }

    # If output is a file, check that it is writable
    if ($outType eq 'filename' && -e $outValue && ! -w _)
      { return $obj->saveErrorString(undef, "Output file '$outValue' is not writable" ) }



    if ($got->parsed('Encode')) { 
        my $want_encoding = $got->value('Encode');
        *$obj->{Encoding} = getEncoding($obj, $class, $want_encoding);
    }

    $obj->ckParams($got)
        or $obj->croakError("${class}: " . $obj->error());


    $obj->saveStatus(STATUS_OK) ;

    my $status ;
    if (! $merge)
    {
        *$obj->{Compress} = $obj->mkComp($class, $got)
            or return undef;
        
        *$obj->{UnCompSize} = new U64 ;
        *$obj->{CompSize} = new U64 ;

        if ( $outType eq 'buffer') {
            ${ *$obj->{Buffer} }  = ''
                unless $appendOutput ;
        }
        else {
            if ($outType eq 'handle') {
                *$obj->{FH} = $outValue ;
                setBinModeOutput(*$obj->{FH}) ;
                $outValue->flush() ;
                *$obj->{Handle} = 1 ;
                if ($appendOutput)
                {
                    seek(*$obj->{FH}, 0, SEEK_END)
                        or return $obj->saveErrorString(undef, "Cannot seek to end of output filehandle: $!", $!) ;

                }
            }
            elsif ($outType eq 'filename') {    
                my $mode = '>' ;
                $mode = '>>'
                    if $appendOutput;
                *$obj->{FH} = new IO::File "$mode $outValue" 
                    or return $obj->saveErrorString(undef, "cannot open file '$outValue': $!", $!) ;
                *$obj->{StdIO} = ($outValue eq '-'); 
                setBinModeOutput(*$obj->{FH}) ;
            }
        }

        *$obj->{Header} = $obj->mkHeader($got) ;
        $obj->output( *$obj->{Header} )
            or return undef;
    }
    else
    {
        *$obj->{Compress} = $obj->createMerge($outValue, $outType)
            or return undef;
    }

    *$obj->{Closed} = 0 ;
    *$obj->{AutoClose} = $got->value('AutoClose') ;
    *$obj->{Output} = $outValue;
    *$obj->{ClassName} = $class;
    *$obj->{Got} = $got;
    *$obj->{OneShot} = 0 ;

    return $obj ;
}

sub ckOutputParam 
{
    my $self = shift ;
    my $from = shift ;
    my $outType = whatIsOutput($_[0]);

    $self->croakError("$from: output parameter not a filename, filehandle or scalar ref")
        if ! $outType ;

    $self->croakError("$from: output filename is undef or null string")
        if $outType eq 'filename' && (! defined $_[0] || $_[0] eq '')  ;

    $self->croakError("$from: output buffer is read-only")
        if $outType eq 'buffer' && readonly(${ $_[0] });
    
    return 1;    
}


sub _def
{
    my $obj = shift ;
    
    my $class= (caller)[0] ;
    my $name = (caller(1))[3] ;

    $obj->croakError("$name: expected at least 1 parameters\n")
        unless @_ >= 1 ;

    my $input = shift ;
    my $haveOut = @_ ;
    my $output = shift ;

    my $x = new Validator($class, *$obj->{Error}, $name, $input, $output)
        or return undef ;

    push @_, $output if $haveOut && $x->{Hash};

    *$obj->{OneShot} = 1 ;

    my $got = $obj->checkParams($name, undef, @_)
        or return undef ;

    $x->{Got} = $got ;

#    if ($x->{Hash})
#    {
#        while (my($k, $v) = each %$input)
#        {
#            $v = \$input->{$k} 
#                unless defined $v ;
#
#            $obj->_singleTarget($x, 1, $k, $v, @_)
#                or return undef ;
#        }
#
#        return keys %$input ;
#    }

    if ($x->{GlobMap})
    {
        $x->{oneInput} = 1 ;
        foreach my $pair (@{ $x->{Pairs} })
        {
            my ($from, $to) = @$pair ;
            $obj->_singleTarget($x, 1, $from, $to, @_)
                or return undef ;
        }

        return scalar @{ $x->{Pairs} } ;
    }

    if (! $x->{oneOutput} )
    {
        my $inFile = ($x->{inType} eq 'filenames' 
                        || $x->{inType} eq 'filename');

        $x->{inType} = $inFile ? 'filename' : 'buffer';
        
        foreach my $in ($x->{oneInput} ? $input : @$input)
        {
            my $out ;
            $x->{oneInput} = 1 ;

            $obj->_singleTarget($x, $inFile, $in, \$out, @_)
                or return undef ;

            push @$output, \$out ;
            #if ($x->{outType} eq 'array')
            #  { push @$output, \$out }
            #else
            #  { $output->{$in} = \$out }
        }

        return 1 ;
    }

    # finally the 1 to 1 and n to 1
    return $obj->_singleTarget($x, 1, $input, $output, @_);

    croak "should not be here" ;
}

sub _singleTarget
{
    my $obj             = shift ;
    my $x               = shift ;
    my $inputIsFilename = shift;
    my $input           = shift;
    
    if ($x->{oneInput})
    {
        $obj->getFileInfo($x->{Got}, $input)
            if isaFilename($input) and $inputIsFilename ;

        my $z = $obj->_create($x->{Got}, @_)
            or return undef ;


        defined $z->_wr2($input, $inputIsFilename) 
            or return $z->closeError(undef) ;

        return $z->close() ;
    }
    else
    {
        my $afterFirst = 0 ;
        my $inputIsFilename = ($x->{inType} ne 'array');
        my $keep = $x->{Got}->clone();

        #for my $element ( ($x->{inType} eq 'hash') ? keys %$input : @$input)
        for my $element ( @$input)
        {
            my $isFilename = isaFilename($element);

            if ( $afterFirst ++ )
            {
                defined addInterStream($obj, $element, $isFilename)
                    or return $obj->closeError(undef) ;
            }
            else
            {
                $obj->getFileInfo($x->{Got}, $element)
                    if $isFilename;

                $obj->_create($x->{Got}, @_)
                    or return undef ;
            }

            defined $obj->_wr2($element, $isFilename) 
                or return $obj->closeError(undef) ;

            *$obj->{Got} = $keep->clone();
        }
        return $obj->close() ;
    }

}

sub _wr2
{
    my $self = shift ;

    my $source = shift ;
    my $inputIsFilename = shift;

    my $input = $source ;
    if (! $inputIsFilename)
    {
        $input = \$source 
            if ! ref $source;
    }

    if ( ref $input && ref $input eq 'SCALAR' )
    {
        return $self->syswrite($input, @_) ;
    }

    if ( ! ref $input  || isaFilehandle($input))
    {
        my $isFilehandle = isaFilehandle($input) ;

        my $fh = $input ;

        if ( ! $isFilehandle )
        {
            $fh = new IO::File "<$input"
                or return $self->saveErrorString(undef, "cannot open file '$input': $!", $!) ;
        }
        binmode $fh if *$self->{Got}->valueOrDefault('BinModeIn') ;

        my $status ;
        my $buff ;
        my $count = 0 ;
        while (($status = read($fh, $buff, 16 * 1024)) > 0) {
            $count += length $buff;
            defined $self->syswrite($buff, @_) 
                or return undef ;
        }

        return $self->saveErrorString(undef, $!, $!) 
            if $status < 0 ;

        if ( (!$isFilehandle || *$self->{AutoClose}) && $input ne '-')
        {    
            $fh->close()