io.github.binaryfoo.decoders.DataObjectListDecoder.kt Maven / Gradle / Ivy

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Some decoders for the data used in EMV credit card transactions.

There is a newer version: 0.1.8

package io.github.binaryfoo.decoders

import io.github.binaryfoo.DecodedData
import io.github.binaryfoo.Decoder
import io.github.binaryfoo.tlv.ISOUtil
import io.github.binaryfoo.tlv.Tag

import java.nio.ByteBuffer
import java.util.ArrayList
import kotlin.text.Regex
import kotlin.text.matches

class DataObjectListDecoder : Decoder {
    override fun decode(input: String, startIndexInBytes: Int, session: DecodeSession): List {
        val children = ArrayList()
        val buffer = ByteBuffer.wrap(ISOUtil.hex2byte(input))
        var offset = startIndexInBytes
        while (buffer.hasRemaining()) {
            val tag = Tag.parse(buffer)
            val b = buffer.get()
            val newOffset = offset + tag.bytes.size + 1
            children.add(DecodedData.primitive("", tag.toString(session.tagMetaData!!) + " " + b + " bytes", offset, newOffset))
            offset = newOffset
        }
        return children
    }

    override fun validate(input: String?): String? {
        if (input != null && input.matches(Regex("^[0-9A-Za-z]$"))) {
            return "Only A-Z and 0-9 are valid"
        }
        return null
    }

    override fun getMaxLength(): Int {
        return Integer.MAX_VALUE
    }
}