File perl-XML-SAX-0.96-utf8.diff of Package perl-XML-SAX

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File perl-XML-SAX-0.96-utf8.diff of Package perl-XML-SAX (Revision 4f5fd9053a43d9a223fe1959e575b634)

Currently displaying revision 4f5fd9053a43d9a223fe1959e575b634 , Show latest

--- SAX/PurePerl/Reader/Stream.pm
+++ SAX/PurePerl/Reader/Stream.pm
@@ -70,6 +70,54 @@
     my $self = shift;
     my ($encoding) = @_;
     # warn("set encoding to: $encoding\n");
+
+    # make sure that the buffer used to detect the encoding 
+    # does not end in the middle of a utf8 sequence
+    if ($encoding eq 'UTF-8' && 
+         !$self->[EOF] && 
+         !utf8::is_utf8($self->[BUFFER]) && # make sure we do not do it twice
+         length($self->[BUFFER]) > 5) {
+
+	my $x = reverse(substr($self->[BUFFER], -5));
+	my $y = 0;
+	
+	# skip the all the bytes at the end of buffer
+	# starting with bits 10 (continuation bytes of utf8 sequence)
+	while ($x ne "" && (ord($x) & 0xc0) == 0x80) {
+	    $y--;
+	    $x = substr($x, 1);
+	}
+
+        # if $x is ascii character, do nothing
+	# otherwise we must take a look how many
+	# continuation bytes we need
+	if ((ord($x) & 0xc0) == 0xc0) {
+	  $x = ord($x);
+	  if (($x & 0xe0) == 0xc0) { # the sequence contains one more byte
+	    $y++;
+	  } elsif (($x & 0xf0) == 0xe0) { # ...2 bytes
+	    $y += 2;
+	  } elsif (($x & 0xf8) == 0xf0) { # ...3 bytes
+	    $y += 3;
+	  } elsif (($x & 0xfc) == 0xf8) { # ...4 bytes
+	    $y += 4;
+	  } elsif (($x & 0xfe) == 0xfc) { # ...5 bytes
+	    $y += 5;
+	  }
+
+          # read the last sequence in the buffer completely, if needed
+	  if ($y > 0) {
+	    my $buf;
+	    my $bytesread = read($self->[FH], $buf, $y);
+	    if ($bytesread) {
+		$self->[BUFFER] .= $buf;
+	    } elsif (defined($bytesread)) {
+		$self->[EOF]++;
+	    }
+	  }
+	}
+      }
+
     XML::SAX::PurePerl::Reader::switch_encoding_stream($self->[FH], $encoding);
     XML::SAX::PurePerl::Reader::switch_encoding_string($self->[BUFFER], $encoding);
     $self->[ENCODING] = $encoding;

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File perl-XML-SAX-0.96-utf8.diff of Package perl-XML-SAX (Revision 4f5fd9053a43d9a223fe1959e575b634)

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