ean-epc/epc/sscc/sscc96.js

EPC Tag Data Standard encoding and decoding library, written in javascript

import Utils from '../utils/utils';
import { Epc } from '../epc';
import { Type } from '../type';
import { Partition } from '../partition';

export class Sscc96 extends Epc {
  constructor(hexEpc) {
    super(Sscc96.TOTAL_BITS);
    if (hexEpc) {
      super.setFromHexString(hexEpc);
    } else {
      super.set(Sscc96.EPC_HEADER, Epc.EPC_HEADER_OFFSET, Epc.EPC_HEADER_END);
    }
  }

  clone() {
    return new Sscc96().setFromBitArray(this);
  }

  getType() {
    return Type.SSCC96;
  }

  fromTagURI(uri) {
    const value = uri.split(':');
    try {
      if (value[3] === this.TAG_URI) {
        const data = value[4].split('.');
        const result = new Sscc96();
        result.setFilter(parseInt(data[0]));
        result.setPartition(12 - data[1].length);
        result.setCompanyPrefix(parseInt(data[1]));
        result.setSerialReference(parseInt(data[2]));
        return result;
      }
    } catch (e) {
      // console.log(e)
    }
    throw new Error(`${uri} is not a known EPC tag URI scheme`);
  }

  toTagURI() {
    // F.C.S (Filter, Company, Serial)
    let partition = Sscc96.PARTITIONS[this.getPartition()];
    return Sscc96.TAG_URI_TEMPLATE(
      this.getFilter(),
      this.getSegmentString(partition.a),
      this.getSegmentString(partition.b),
    );
  }

  toIdURI() {
    // C.S   (Company, Serial)
    let partition = Sscc96.PARTITIONS[this.getPartition()];
    return Sscc96.PID_URI_TEMPLATE(
      this.getSegmentString(partition.a),
      this.getSegmentString(partition.b),
    );
  }

  toBarcode() {
    return this.getSscc();
  }

  getTotalBits() {
    return Sscc96.TOTAL_BITS;
  }

  getHeader() {
    return Sscc96.EPC_HEADER;
  }

  getPartition() {
    return super.get(Sscc96.PARTITION_OFFSET, Sscc96.PARTITION_END);
  }

  setPartition(value) {
    if (value < 0 || value >= Sscc96.PARTITIONS.length) {
      throw new Error(
        `Value '${value}' out of range (min: 0, max: ${Sscc96.PARTITIONS.length - 1})`,
      );
    }
    super.set(value, Sscc96.PARTITION_OFFSET, Sscc96.PARTITION_END);
    return this;
  }

  getSscc() {
    let partition = Sscc96.PARTITIONS[this.getPartition()];
    let item = super.getSegmentString(partition.b);
    let result =
      item.substring(0, 1) + super.getSegmentString(partition.a) + item.substring(1);
    return result + Utils.computeCheckDigit(result);
  }

  setSscc(gtin) {
    // ean
    let partition = Sscc96.PARTITIONS[this.getPartition()];
    super.setSegment(gtin.substring(1, partition.a.digits + 1), partition.a);
    super.setSegment(
      Number(
        gtin.charAt(0) +
          gtin.substring(partition.a.digits + 1, partition.a.digits + partition.b.digits),
      ),
      partition.b,
    );
    return this;
  }

  getCompanyPrefix() {
    return super.getSegment(Sscc96.PARTITIONS[this.getPartition()].a);
  }

  setCompanyPrefix(value) {
    super.setSegment(value, Sscc96.PARTITIONS[this.getPartition()].a);
    return this;
  }

  getSerialReference() {
    return super.getSegment(Sscc96.PARTITIONS[this.getPartition()].b);
  }

  setSerialReference(value) {
    super.setSegment(value, Sscc96.PARTITIONS[this.getPartition()].b);
    return this;
  }

  getMaxSerialReference() {
    return Sscc96.PARTITIONS[this.getPartition()].b.maxValue;
  }
}

Sscc96.EPC_HEADER = 0x31;

Sscc96.TOTAL_BITS = 96;
Sscc96.PARTITION_OFFSET = 11;
Sscc96.PARTITION_END = 14;

Sscc96.TAG_URI = 'sscc-96';

Sscc96.TAG_URI_TEMPLATE = (filter, company, serial) => {
  return `urn:epc:tag:${this.TAG_URI}:${filter}.${company}.${serial}`;
}; // F.C.S (Filter, Company, Serial)
Sscc96.PID_URI_TEMPLATE = (company, serial) => {
  return `urn:epc:id:sscc:${company}.${serial}`;
}; // C.S   (Company, Serial)

// Partition table columns: Company prefix, Serial Reference
Sscc96.PARTITIONS = [
  new Partition(Sscc96.PARTITION_END, 40, 12, 18, 5), // 0 40 12 18 05
  new Partition(Sscc96.PARTITION_END, 37, 11, 21, 6), // 1 37 11 21 06
  new Partition(Sscc96.PARTITION_END, 34, 10, 24, 7), // 2 34 10 24 07
  new Partition(Sscc96.PARTITION_END, 30, 9, 28, 8), // 3 30 09 28 08
  new Partition(Sscc96.PARTITION_END, 27, 8, 31, 9), // 4 27 08 31 09
  new Partition(Sscc96.PARTITION_END, 24, 7, 34, 10), // 5 24 07 34 10
  new Partition(Sscc96.PARTITION_END, 20, 6, 38, 11),
]; // 6 20 06 38 11