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package installer::files;

use installer::exiter;
use installer::logger;

############################################
# File Operations
############################################

sub check_file
{
	my ($arg) = @_;

	if ( $installer::globals::debug ) { installer::logger::debuginfo("installer::files::check_file : $arg"); }

	if(!( -f $arg ))
	{
		installer::exiter::exit_program("ERROR: Cannot find file $arg", "check_file");
	}
}

sub read_file
{
	my ($localfile) = @_;
	my @localfile = ();

	if ( $installer::globals::debug ) { installer::logger::debuginfo("installer::files::read_file : $localfile"); }

	open( IN, "<$localfile" ) || installer::exiter::exit_program("ERROR: Cannot open file $localfile for reading", "read_file");

#	Don't use "my @localfile = <IN>" here, because
#	perl has a problem with the internal "large_and_huge_malloc" function
#	when calling perl using MacOS 10.5 with a perl built with MacOS 10.4
	while ( $line = <IN> ) {
		push @localfile, $line;
	}

	close( IN );

	return \@localfile;
}

###########################################
# Saving files, arrays and hashes
###########################################

sub save_file
{
	my ($savefile, $savecontent) = @_;

	if ( $installer::globals::debug ) { installer::logger::debuginfo("installer::files::save_file : $savefile : $#{$savecontent}"); }

	if ( open( OUT, ">$savefile" ) )
	{
		print OUT @{$savecontent};
		close( OUT);	
	}
	else
	{
		# it is useless to save a log file, if there is no write access
		
		if ( $savefile =~ /\.log/ )
		{
			print "\n*************************************************\n";
			print "ERROR: Cannot write log file: $savefile"; 
			print "\n*************************************************\n";
			exit(-1);	# exiting the program to avoid endless loops
		}
		
		installer::exiter::exit_program("ERROR: Cannot open file $savefile for writing", "save_file");	
	}
}

sub save_hash
{
	my ($savefile, $hashref) = @_;

	if ( $installer::globals::debug ) { installer::logger::debuginfo("installer::files::save_hash : $savefile"); }

	my @printcontent = ();
	
	my $itemkey;
		
	foreach $itemkey ( keys %{$hashref} )
	{
		my $line = "";
		my $itemvalue = $hashref->{$itemkey};
		$line = $itemkey . "=" . $itemvalue . "\n";
		push(@printcontent, $line);
	}

	open( OUT, ">$savefile" ) || installer::exiter::exit_program("ERROR: Cannot open file $savefile for writing", "save_hash");
	print OUT @printcontent;
	close( OUT);
}

sub save_array_of_hashes
{
	my ($savefile, $arrayref) = @_;

	if ( $installer::globals::debug ) { installer::logger::debuginfo("installer::files::save_array_of_hashes : $savefile : $#{$arrayref}"); }

	my @printcontent = ();
			
	for ( my $i = 0; $i <= $#{$arrayref}; $i++ )
	{		
		my $line = "";
		my $hashref = ${$arrayref}[$i];
		my $itemkey;
			
		foreach $itemkey ( keys %{$hashref} )
		{
			my $itemvalue = $hashref->{$itemkey};
			$line = $line . $itemkey . "=" . $itemvalue . "\t";
		}

		$line = $line . "\n";
		
		push(@printcontent, $line);
	}

	open( OUT, ">$savefile" ) || installer::exiter::exit_program("ERROR: Cannot open file $savefile for writing", "save_array_of_hashes");
	print OUT @printcontent;
	close( OUT);
}

sub save_array_of_hashes_modules
{
	my ($savefile, $arrayref) = @_;

	if ( $installer::globals::debug ) { installer::logger::debuginfo("installer::files::save_array_of_hashes : $savefile : $#{$arrayref}"); }

	my @printcontent = ();
			
	for ( my $i = 0; $i <= $#{$arrayref}; $i++ )
	{		
		my $line = "***************************************************\n";
		my $hashref = ${$arrayref}[$i];
		my $itemkey;
			
		foreach $itemkey ( keys %{$hashref} )
		{
			my $itemvalue = $hashref->{$itemkey};
			$line = $line . $itemkey . "=" . $itemvalue . "\n";
		}

		$line = $line . "\n";
		
		push(@printcontent, $line);
	}

	open( OUT, ">$savefile" ) || installer::exiter::exit_program("ERROR: Cannot open file $savefile for writing", "save_array_of_hashes");
	print OUT @printcontent;
	close( OUT);
}

###########################################
# Binary file operations
###########################################

sub read_binary_file
{
	my ($filename) = @_;

	if ( $installer::globals::debug ) { installer::logger::debuginfo("installer::files::read_binary_file : $filename"); }

	my $file;

	open( IN, "<$filename" ) || installer::exiter::exit_program("ERROR: Cannot open file $filename for reading", "read_binary_file");
	binmode IN;
	seek IN, 0, 2;
	my $length = tell IN;
	seek IN, 0, 0;
	read IN, $file, $length;
	close IN;

	return $file;
}

sub save_binary_file
{
	my ($file, $filename) = @_;

	if ( $installer::globals::debug ) { installer::logger::debuginfo("installer::files::save_binary_file : $filename"); }

	open( OUT, ">$filename" ) || installer::exiter::exit_program("ERROR: Cannot open file $filename for writing", "save_binary_file");
	binmode OUT;
	print OUT $file;
	close OUT;
}

1;