Initial Commit

database/perl/lib/IO/Uncompress/Adapter/Identity.pm

@@ -0,0 +1,188 @@
+package IO::Uncompress::Adapter::Identity;
+
+use warnings;
+use strict;
+use bytes;
+
+use IO::Compress::Base::Common  2.100 qw(:Status);
+use IO::Compress::Zip::Constants ;
+
+our ($VERSION);
+
+$VERSION = '2.100';
+
+use Compress::Raw::Zlib  2.100 ();
+
+sub mkUncompObject
+{
+    my $streaming = shift;
+    my $zip64 = shift;
+
+    my $crc32 = 1; #shift ;
+    my $adler32 = shift;
+
+    bless { 'CompSize'   => U64->new(), # 0,
+            'UnCompSize' => 0,
+            'wantCRC32'  => $crc32,
+            'CRC32'      => Compress::Raw::Zlib::crc32(''),
+            'wantADLER32'=> $adler32,
+            'ADLER32'    => Compress::Raw::Zlib::adler32(''),
+            'ConsumesInput' => 1,
+            'Streaming'  => $streaming,
+            'Zip64'      => $zip64,
+            'DataHdrSize'  => $zip64 ? 24 :  16,
+            'Pending'   => '',
+
+          } ;
+}
+
+
+sub uncompr
+{
+    my $self = shift;
+    my $in = $_[0];
+    my $eof = $_[2];
+
+    my $len = length $$in;
+    my $remainder = '';
+
+    if (defined $$in && $len) {
+
+        if ($self->{Streaming}) {
+
+            if (length $self->{Pending}) {
+                $$in = $self->{Pending} . $$in ;
+                $len = length $$in;
+                $self->{Pending} = '';
+            }
+
+            my $ind = index($$in, "\x50\x4b\x07\x08");
+
+            if ($ind < 0) {
+                $len = length $$in;
+                if ($len >= 3 && substr($$in, -3) eq "\x50\x4b\x07") {
+                    $ind = $len - 3 ;
+                }
+                elsif ($len >= 2 && substr($$in, -2) eq "\x50\x4b") {
+                    $ind = $len - 2 ;
+                }
+                elsif ($len >= 1 && substr($$in, -1) eq "\x50") {
+                    $ind = $len - 1 ;
+                }
+            }
+
+            if ($ind >= 0) {
+                $remainder = substr($$in, $ind) ;
+                substr($$in, $ind) = '' ;
+            }
+        }
+
+        if (length $remainder && length $remainder < $self->{DataHdrSize}) {
+            $self->{Pending} = $remainder ;
+            $remainder = '';
+        }
+        elsif (length $remainder >= $self->{DataHdrSize}) {
+            my $crc = unpack "V", substr($remainder, 4);
+            if ($crc == Compress::Raw::Zlib::crc32($$in,  $self->{CRC32})) {
+                my ($l1, $l2) ;
+
+                if ($self->{Zip64}) {
+                    $l1 = U64::newUnpack_V64(substr($remainder, 8));
+                    $l2 = U64::newUnpack_V64(substr($remainder, 16));
+                }
+                else {
+                    $l1 = U64::newUnpack_V32(substr($remainder, 8));
+                    $l2 = U64::newUnpack_V32(substr($remainder, 12));
+                }
+
+                my $newLen = $self->{CompSize}->clone();
+                $newLen->add(length $$in);
+                if ($l1->equal($l2) && $l1->equal($newLen) ) {
+                    $eof = 1;
+                }
+                else {
+                    $$in .= substr($remainder, 0, 4) ;
+                    $remainder       = substr($remainder, 4);
+                    #$self->{Pending} = substr($remainder, 4);
+                    #$remainder = '';
+                    $eof = 0;
+                }
+            }
+            else {
+                $$in .= substr($remainder, 0, 4) ;
+                $remainder       = substr($remainder, 4);
+                #$self->{Pending} = substr($remainder, 4);
+                #$remainder = '';
+                $eof = 0;
+            }
+        }
+
+        if (length $$in) {
+            $self->{CompSize}->add(length $$in) ;
+
+            $self->{CRC32} = Compress::Raw::Zlib::crc32($$in,  $self->{CRC32})
+                if $self->{wantCRC32};
+
+            $self->{ADLER32} = Compress::Zlib::adler32($$in,  $self->{ADLER32})
+                if $self->{wantADLER32};
+        }
+
+        ${ $_[1] } .= $$in;
+        $$in  = $remainder;
+    }
+
+    return STATUS_ENDSTREAM if $eof;
+    return STATUS_OK ;
+}
+
+sub reset
+{
+    my $self = shift;
+
+    $self->{CompSize}->reset();
+    $self->{UnCompSize} = 0;
+    $self->{CRC32}      = Compress::Raw::Zlib::crc32('');
+    $self->{ADLER32}    = Compress::Raw::Zlib::adler32('');
+
+    return STATUS_OK ;
+}
+
+#sub count
+#{
+#    my $self = shift ;
+#    return $self->{UnCompSize} ;
+#}
+
+sub compressedBytes
+{
+    my $self = shift ;
+    return $self->{CompSize} ;
+}
+
+sub uncompressedBytes
+{
+    my $self = shift ;
+    return $self->{CompSize} ;
+}
+
+sub sync
+{
+    return STATUS_OK ;
+}
+
+sub crc32
+{
+    my $self = shift ;
+    return $self->{CRC32};
+}
+
+sub adler32
+{
+    my $self = shift ;
+    return $self->{ADLER32};
+}
+
+
+1;
+
+__END__