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Certificate transparency for Android and Java

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/*
 * Copyright 2023 Appmattus Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.appmattus.certificatetransparency.internal.utils.asn1

import com.appmattus.certificatetransparency.internal.utils.asn1.bytes.ByteBuffer
import com.appmattus.certificatetransparency.internal.utils.asn1.header.ASN1HeaderTag

internal class ASN1Null private constructor(
    override val tag: ASN1HeaderTag,
    override val encoded: ByteBuffer,
    override val logger: ASN1Logger
) : ASN1Object() {

    init {
        assert(encoded.size >= 0)
        if (encoded.size > 0) {
            logger.warning("ASN1Null", "Non-zero length of value block for NULL type")
        }
    }

    val value: Unit by lazy {
        try {
            @Suppress("UNUSED_EXPRESSION")
            encoded.forEach { it }
        } catch (expected: ArrayIndexOutOfBoundsException) {
            throw IllegalStateException("End of input reached before message was fully decoded", expected)
        }
    }

    override fun toString(): String = "NULL".also { value }

    companion object {
        fun create(tag: ASN1HeaderTag, encoded: ByteBuffer, logger: ASN1Logger) = ASN1Null(tag, encoded, logger)
    }
}