[HARMONY-1395] Code for reading and writing binary DTDs using ASN.1 encoding

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: Contributions
• Patch Info: Patch Available
• Estimated Complexity: Moderate
• Assignee: Unassigned
• Reporter: Miguel Montes
• Created: 06/Sep/06 19:19
• Updated: 15/Nov/06 01:43

Description

The class javax.swing.text.html.parser.DTD has a method read() for loading a binary DTD. The format of this binary file is not specified, so the current implementation uses serialization. This approach has several problems, so it was suggested in harmony-dev the use of ASN.1 to encode the DTD information.
Attached is a zip file with a set of classes for encoding and decoding a DTD, using the ASN.1 framework already in use in javax.crypto; and two bdtds, one for HTML 3.2 and one for HTML 4.01. Also attached is a patch for DTD.java and DTDUtilities.java.

The proposed format is:
BDTD ::= SEQUENCE {
name UTF8String,
entity SET OF HTMLEntity,
element SET OF HTMLElement
}

HTMLEntity ::= SEQUENCE {
name UTF8String,
value INTEGER,
general [0] IMPLICIT BOOLEAN DEFAULT FALSE,
parameter [1] IMPLICIT BOOLEAN DEFAULT FALSE,
data UTF8String
}

HTMLElement ::= SEQUENCE {
index INTEGER,
name UTF8String,
type INTEGER,
oStart BOOLEAN,
oEnd BOOLEAN,
exclusions [0] IMPLICIT SET OF INTEGER OPTIONAL,
inclusions [1] IMPLICIT SET OF INTEGER OPTIONAL,
attributes SET OF HTMLElementAttributes OPTIONAL,
contentModel HTMLContentModel
}

HTMLContentModel ::= SEQUENCE OF SEQUENCE {
type INTEGER,
index INTEGER
}

HTMLElementAttributes ::= SEQUENCE

{ name UTF8String, type INTEGER, modifier INTEGER, defaultValue UTF8String OPTIONAL, possibleValues SET OF UTF8String OPTIONAL }