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package com.nh.php.curl;

import com.sun.jna.Structure;

import java.util.Arrays;
import java.util.List;

public class fd_set extends Structure {
	public static final int FD_SETSIZE = 1024;
	public static final int NFDBITS = 32 * 8;
	public static final int FD_NFDBITS = NFDBITS;

	public static final int howmany = (((FD_SETSIZE) + ((FD_NFDBITS) - 1)) / (FD_NFDBITS));

	public int[] fds_bits = new int[howmany];

	public void set(int fd) {
		int index = fd / FD_NFDBITS;
		int offset = fd % FD_NFDBITS;

		fds_bits[index] |= (1 << offset);
	}

	public void clr(int fd) {
		int index = fd / FD_NFDBITS;
		int offset = fd % FD_NFDBITS;

		fds_bits[index] &= ~(1 << offset);
	}

	public boolean isSet(int fd) {
		int index = fd / FD_NFDBITS;
		int offset = fd % FD_NFDBITS;

		return (fds_bits[index] & (1 << offset)) != 0;
	}

	public void zero() {
		for (int i = 0; i < fds_bits.length; i++) {
			fds_bits[i] = 0;
		}
	}

	@Override
	protected List getFieldOrder() {
		return Arrays.asList(new String[] { "fds_bits" });
	}
}