de.intarsys.tools.tlv.common.TlvTools Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of isrt Show documentation

The basic runtime tools and interfaces for intarsys components.

There is a newer version: 4.11

package de.intarsys.tools.tlv.common;

/**
 * Tool methods for handling the TLV implementation.
 * 
 */
public class TlvTools {

	public static int asInt(byte[] src, int offset, int length) {
		length = length < 4 ? length : 4;
		length = length <= (src.length - offset) ? length : src.length - offset;
		int result = src[offset];
		for (int i = 1; i < length; i++) {
			result <<= 8;
			result += src[offset + i] & 0xFF;
		}
		return result;
	}

	public static int asInt(TlvElement element) {
		return asInt(element.buffer, element.offset, element.length);
	}

	public static int asUnsignedInt(byte[] src, int offset, int length) {
		length = length < 4 ? length : 4;
		length = length <= (src.length - offset) ? length : src.length - offset;
		int result = src[offset] & 0xFF;
		for (int i = 1; i < length; i++) {
			result <<= 8;
			result += src[offset + i] & 0xFF;
		}
		return result;
	}

	public static int asUnsignedInt(TlvElement element) {
		return asUnsignedInt(element.buffer, element.offset, element.length);
	}

	public static void checkSize(byte[] src, int minSize) {
		if (src == null) {
			throw new IllegalArgumentException("byte[] src cannot be null"); //$NON-NLS-1$
		}
		if (src.length < minSize) {
			throw new IllegalArgumentException("byte[] src is to small"); //$NON-NLS-1$
		}
	}

	private TlvTools() {
		//
	}

}