Improve the selection of parser for XML::Simple.

[spider.git] / perl / RingBuf.pm

diff --git a/perl/RingBuf.pm b/perl/RingBuf.pm
new file mode 100644 (file)
index 0000000..82b534e
--- /dev/null
+++ b/perl/RingBuf.pm
@@ -0,0 +1,79 @@
+#
+# Finite size ring buffer creation and access routines
+#
+# Copyright (c) - 1998 Dirk Koopman G1TLH
+#
+# $Id$
+#
+
+use strict;
+
+package RingBuf;
+
+use vars qw($VERSION $BRANCH);
+$VERSION = sprintf( "%d.%03d", q$Revision$ =~ /(\d+)\.(\d+)/ );
+$BRANCH = sprintf( "%d.%03d", q$Revision$ =~ /\d+\.\d+\.(\d+)\.(\d+)/  || (0,0));
+$main::build += $VERSION;
+$main::branch += $BRANCH;
+
+
+sub new
+{
+       my $pkg = shift;
+       my $size = shift;
+       return bless [$size, 0, 0, 0, 0, []], (ref $pkg || $pkg);
+}
+
+sub write
+{
+       my $self = shift;
+
+       $self->[5]->[$self->[2]++] = shift;
+       $self->[2] = 0 if $self->[2] >= $self->[0];
+       if ($self->[1] < $self->[0]) {
+               $self->[1] = ++$self->[1];
+       }
+       $self->[2] = $self->[2];
+       if ($self->[1] == $self->[0] && $self->[2] == $self->[3]) {
+               $self->[3] = $self->[2]+1;
+               $self->[3] = 0 if $self->[3] >= $self->[0]; 
+       }
+}
+
+sub read
+{
+       my $self = shift;
+       return unless $self->[1];
+       my $r;
+       
+       if ($self->[4] != $self->[2]) {
+               $r = $self->[5]->[$self->[4]++];
+               $self->[4] = 0 if $self->[4] >= $self->[0];
+       }
+       return $r;
+}
+
+sub rewind
+{
+       my $self = shift;
+       $self->[4] = $self->[3];
+}
+
+sub lth
+{
+       my $self = shift;
+       return $self->[1];
+}
+
+sub readall
+{
+       my $self = shift;
+       my @out;
+       
+       $self->rewind;
+       while (my $r = $self->read) {
+               push @out, $r;
+       }
+       return @out;
+}
+1;