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/* Copyright (c) 2010,2011 Daniel Doubrovkine, All Rights Reserved
 *
 * The contents of this file is dual-licensed under 2
 * alternative Open Source/Free licenses: LGPL 2.1 or later and
 * Apache License 2.0. (starting with JNA version 4.0.0).
 *
 * You can freely decide which license you want to apply to
 * the project.
 *
 * You may obtain a copy of the LGPL License at:
 *
 * http://www.gnu.org/licenses/licenses.html
 *
 * A copy is also included in the downloadable source code package
 * containing JNA, in file "LGPL2.1".
 *
 * You may obtain a copy of the Apache License at:
 *
 * http://www.apache.org/licenses/
 *
 * A copy is also included in the downloadable source code package
 * containing JNA, in file "AL2.0".
 */
package com.sun.jna.platform.win32;

import com.sun.jna.platform.win32.WinNT.HRESULT;

/**
 * Utility class for some common error functions.
 */
public abstract class W32Errors implements WinError {

    /**
     * Generic test for success on any status value (non-negative numbers
     * indicate success).
     *
     * @param hr the hr
     *
     * @return true, if successful
     */
    public static final boolean SUCCEEDED(int hr) {
        return hr >= 0;
    }

    /**
     * and the inverse.
     *
     * @param hr the hr
     *
     * @return true, if successful
     */
    public static final boolean FAILED(int hr) {
        return hr < 0;
    }

    /**
     * Succeeded.
     *
     * @param hr the hr
     *
     * @return true, if successful
     */
    public static final boolean SUCCEEDED(HRESULT hr) {
        return hr == null || SUCCEEDED(hr.intValue());
    }

    /**
     * Failed.
     *
     * @param hr the hr
     *
     * @return true, if successful
     */
    public static final boolean FAILED(HRESULT hr) {
        return hr != null && FAILED(hr.intValue());
    }

    /**
     * Extract error code from HRESULT.
     *
     * @param hr the hr
     *
     * @return the int
     */
    public static final int HRESULT_CODE(int hr) {
        return hr & 0xFFFF;
    }

    /**
     * Extract error code from SCODE.
     *
     * @param sc the sc
     *
     * @return the int
     */
    public static final int SCODE_CODE(int sc) {
        return sc & 0xFFFF;
    }

    /**
     * Return the facility.
     *
     * @param hr the hr
     *
     * @return the int
     */
    public static final int HRESULT_FACILITY(int hr) {
        return (hr >>= 16) & 0x1fff;
    }

    /**
     * Scode facility.
     *
     * @param sc the sc
     *
     * @return the int
     */
    public static final int SCODE_FACILITY(short sc) {
        return (sc >>= 16) & 0x1fff;
    }

    /**
     * Return the severity.
     *
     * @param hr the hr
     *
     * @return the short
     */
    public static short HRESULT_SEVERITY(int hr) {
        return (short) ((hr >>= 31) & 0x1);
    }

    /**
     * Scode severity.
     *
     * @param sc the sc
     *
     * @return the short
     */
    public static short SCODE_SEVERITY(short sc) {
        return (short) ((sc >>= 31) & 0x1);
    }

    /**
     * Create an HRESULT value from component pieces.
     *
     * @param sev  the sev
     * @param fac  the fac
     * @param code the code
     *
     * @return the int
     */
    public static int MAKE_HRESULT(short sev, short fac, short code) {
        return ((sev << 31) | (fac << 16) | code);
    }

    /**
     * Make scode.
     *
     * @param sev  the sev
     * @param fac  the fac
     * @param code the code
     *
     * @return the int
     */
    public static final int MAKE_SCODE(short sev, short fac, short code) {
        return ((sev << 31) | (fac << 16) | code);
    }

    /**
     * Map a WIN32 error value into a HRESULT Note: This assumes that WIN32
     * errors fall in the range -32k to=32k.
     *
     * @param x original w32 error code
     *
     * @return the converted value
     */
    public static final HRESULT HRESULT_FROM_WIN32(int x) {
        int f = FACILITY_WIN32;
        return new HRESULT(x <= 0 ? x : ((x) & 0x0000FFFF) | (f <<= 16)
                | 0x80000000);
    }

    /**
     * FACILITY_USERMODE_FILTER_MANAGER
     * 
     * Translation macro for converting: NTSTATUS --> HRESULT.
     *
     * @param x the x
     *
     * @return the int
     */
    public static final int FILTER_HRESULT_FROM_FLT_NTSTATUS(int x) {
        int f = FACILITY_USERMODE_FILTER_MANAGER;
        return (((x) & 0x8000FFFF) | (f <<= 16));
    }

}