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package model.asn1;
import model.asn1.exceptions.ParseException;
import model.asn1.parsing.BytesReader;
/**
* Represents the ASN.1 BOOLEAN type. It always has one byte length. Its content is either 0xFF (true) or 0x00 (false).
*/
public class Bool extends ASN1Object {
/**
* The X.680 universal class tag assignment.
*/
public static final Tag TAG = new Tag(TagClass.UNIVERSAL, false, 0x1);
private final boolean value;
/**
* EFFECTS: Initiate the BOOLEAN with the given tag, an optional context-specific tag number for explicit
* encoding, and its value. For more information, consult {@link ASN1Object}.
* REQUIRES: Consult {@link ASN1Object}.
*/
public Bool(Tag tag, Tag parentTag, boolean value) {
super(tag, parentTag);
this.value = value;
}
/**
* EFFECTS: Parse input bytes. For more information on tags parsing, consult {@link ASN1Object}.
* Throws {@link ParseException} if the input data is invalid:
* - The length is not 1
* - The value is neither 0x00 nor 0xFF
* - Other cases as denoted in {@link ASN1Object}
*/
public Bool(BytesReader encoded, boolean hasParentTag) throws ParseException {
super(encoded, hasParentTag);
if (getLength() != 1) {
throw new ParseException("Invalid boolean length: " + getLength());
}
final Byte val = encoded.require(1, true)[0];
if (val == 0) {
this.value = false;
} else if (val == -1) {
this.value = true;
} else {
throw new ParseException("Unknown boolean value: " + val);
}
}
/**
* EFFECTS: Encode the boolean to either 0x00 or 0xFF.
*/
@Override
public Byte[] encodeValueDER() {
return new Byte[]{value ? (byte) -1 : 0};
}
public boolean getValue() {
return value;
}
}
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