package model.asn1;

import model.asn1.exceptions.ParseException;
import model.asn1.parsing.BytesReader;

/**
 * Represents the ASN.1 OCTET STRING type. An OCTET STRING is just a sequence of bytes.
 */
public class OctetString extends ASN1Object {
    /**
     * The X.680 universal class tag assignment.
     */
    public static final Tag TAG = new Tag(TagClass.UNIVERSAL, false, 0x4);

    private final Byte[] bytes;

    /**
     * EFFECTS: Initiate the OctetString object with the given bytes array. The byte array can be arbitrary.
     * REQUIRES: For the requirements of tag and parentTag, consult {@link ASN1Object}.
     */
    public OctetString(Tag tag, Tag parentTag, Byte[] bytes) {
        super(tag, parentTag);
        this.bytes = bytes;
    }

    /**
     * EFFECTS: Parse tags and value from user input. Tags are parsed as-per {@link ASN1Object}.
     * Throws {@link ParseException} if the encoded data is invalid, see {@link ASN1Object}.
     * MODIFIES: this, encoded
     */
    public OctetString(BytesReader encoded, boolean hasParentTag) throws ParseException {
        super(encoded, hasParentTag);
        this.bytes = encoded.require(getLength(), true);
    }

    /**
     * EFFECTS: Get the value bytes ready to encode into DER.
     */
    @Override
    public Byte[] encodeValueDER() {
        return bytes;
    }

    public Byte[] getBytes() {
        return bytes;
    }
}