diff options
Diffstat (limited to 'base/util/src/netscape/security/util/UniversalCharsetDecoder.java')
-rw-r--r-- | base/util/src/netscape/security/util/UniversalCharsetDecoder.java | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/base/util/src/netscape/security/util/UniversalCharsetDecoder.java b/base/util/src/netscape/security/util/UniversalCharsetDecoder.java new file mode 100644 index 000000000..a41c5ad50 --- /dev/null +++ b/base/util/src/netscape/security/util/UniversalCharsetDecoder.java @@ -0,0 +1,98 @@ +// --- BEGIN COPYRIGHT BLOCK --- +// This program is free software; you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation; version 2 of the License. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License along +// with this program; if not, write to the Free Software Foundation, Inc., +// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. +// +// (C) 2007 Red Hat, Inc. +// All rights reserved. +// --- END COPYRIGHT BLOCK --- +package netscape.security.util; + +import java.nio.ByteBuffer; +import java.nio.CharBuffer; +import java.nio.charset.Charset; +import java.nio.charset.CharsetDecoder; +import java.nio.charset.CoderResult; +import java.nio.charset.CodingErrorAction; + +/** + * Converts bytes in ASN.1 UniversalString character set to UniversalString + * characters. + * + * @author Lily Hsiao + * @author Slava Galperin + */ + +public class UniversalCharsetDecoder extends CharsetDecoder { + + public UniversalCharsetDecoder(Charset cs) { + super(cs, 0.25f, 1); + } + + protected CoderResult decodeLoop(ByteBuffer in, CharBuffer out) { + + while (true) { + // XXX we do not know what to do with truly UCS-4 characters here + // we also assumed network byte order + + if (in.remaining() < 4) + return CoderResult.UNDERFLOW; + + in.mark(); + byte b0 = in.get(); + byte b1 = in.get(); + byte b2 = in.get(); + byte b3 = in.get(); + + if (CodingErrorAction.REPORT == unmappableCharacterAction() && + !((b0 == 0 && b1 == 0) || (b2 == 0 && b3 == 0))) { + return CoderResult.unmappableForLength(4); + } + + char c; + if (b2 == 0 && b3 == 0) { + // Try to be a bit forgiving. If the byte order is + // reversed, we still try handle it. + + // Sample Date Set (1): + // 0000000 f 0 \0 \0 213 0 \0 \0 S 0 \0 \0 + // 0000014 + + // Sample Date Set (2): + // 0000000 w \0 \0 \0 w \0 \0 \0 w \0 \0 \0 . \0 \0 \0 + // 0000020 ( \0 \0 \0 t \0 \0 \0 o \0 \0 \0 b \0 \0 \0 + // 0000040 e \0 \0 \0 | \0 \0 \0 n \0 \0 \0 o \0 \0 \0 + // 0000060 t \0 \0 \0 t \0 \0 \0 o \0 \0 \0 b \0 \0 \0 + // 0000100 e \0 \0 \0 ) \0 \0 \0 . \0 \0 \0 c \0 \0 \0 + // 0000120 o \0 \0 \0 m \0 \0 \0 + // 0000130 + c = (char) (((b1 << 8) & 0xff00) + (b0 & 0x00ff)); + + } else { // (b0 == 0 && b1 == 0) + // This should be the right order. + // + // 0000000 0000 00c4 0000 0064 0000 006d 0000 0069 + // 0000020 0000 006e 0000 0020 0000 0051 0000 0041 + // 0000040 + + c = (char) (((b2 << 8) & 0xff00) + (b3 & 0x00ff)); + } + + if (out.remaining() < 1) { + in.reset(); + return CoderResult.OVERFLOW; + } + + out.put(c); + } + } +} |