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package Cache::CacheUtilities;
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require 5.004;
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use Storable qw(nfreeze thaw retrieve nstore);
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BEGIN {
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eval "use Compress::Zlib qw(gzopen);";
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if ($@){$Cache::CacheUtilities::zipUntility="GZip";}
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else{$Cache::CacheUtilities::zipUntility="CompressZLib";}
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}
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sub read()
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{
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my $data=();
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my $func="read${zipUntility}";
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&$func(@_,\$data);
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my $cache=eval {thaw($data);};
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if ($EVAL_ERROR){die "Cache loading error: ",$EVAL_ERROR,"\n";}
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return $cache;
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}
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sub write()
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{
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my $cache=shift;
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my $file=shift;
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use File::Copy;
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if (-r $file){move($file,"${file}.bak");}
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my $ok=1;
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my $fcache=();
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eval {$fcache=nfreeze($cache);};
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if ($EVAL_ERROR){$ok=0;}
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else
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{
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my $func="write${zipUntility}";
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$ok = &$func($fcache,$file);
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}
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if ($ok)
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{
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unlink ("${file}.bak");
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my $mode=0644;
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chmod $mode,$file;
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}
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else
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{
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if (-r "${file}.bak"){move("${file}.bak",$file);}
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die "ERROR: Writing Cache file: $file\n";
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}
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return;
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}
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###### Using gzip in case Compress::Zlib failed #################
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sub readGZip()
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{
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my $file = shift;
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my $data = shift;
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my $gz;
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if (open($gz,"gzip -cd $file |"))
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{
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binmode $gz;
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my $buf;
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while (read($gz,$buf,1024*1024) > 0){${$data}.=$buf;}
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close($gz);
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}
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else{die "Can not open file for reading using \"gzip\": $file\n";}
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return;
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}
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sub writeGZip()
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{
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my ($cache,$file) = @_;
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my $gz;
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if (open($gz,"| gzip >$file"))
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{
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binmode $gz;
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print $gz $cache;
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close($gz);
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}
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else{die "Can not open file for reading using \"gzip\": $file\n";}
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return 1;
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}
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###### Using Compress::Zlib #################
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sub readCompressZLib()
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{
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my $file = shift;
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my $data = shift;
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if (my $gz = gzopen($file, "rb"))
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{
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my $buf;
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while ($gz->gzread($buf,1024*1024) > 0){${$data}.=$buf;}
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$gz->gzclose();
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}
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else{die "Can not open file \"$file\" for reading: $!\n";}
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return;
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}
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sub writeCompressZLib()
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{
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my ($cache,$file) = @_;
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my $gz = gzopen($file, "wb");
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if ($gz)
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{
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$gz->gzwrite($cache);
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$gz->gzclose();
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return 1;
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}
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return 0;
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}
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1;
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