OpenSim-Test/OpenSim/Framework/PermissionsUtil.cs

/*
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 *       derived from this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
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using System;
using System.Collections.Generic;
using System.Reflection;
using System.Text;
using log4net;

namespace OpenSim.Framework
{
    public static class PermissionsUtil
    {
        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        /// <summary>
        /// Logs permissions flags. Useful when debugging permission problems.
        /// </summary>
        /// <param name="message"></param>
        public static void LogPermissions(String name, String message, uint basePerm, uint curPerm, uint nextPerm)
        {
            m_log.DebugFormat("Permissions of \"{0}\" at \"{1}\": Base {2} ({3:X4}), Current {4} ({5:X4}), NextOwner {6} ({7:X4})",
                name, message,
                PermissionsToString(basePerm), basePerm, PermissionsToString(curPerm), curPerm, PermissionsToString(nextPerm), nextPerm);
        }

        /// <summary>
        /// Converts a permissions bit-mask to a string (e.g., "MCT").
        /// </summary>
        private static string PermissionsToString(uint perms)
        {
            string str = "";
            if ((perms & (int)PermissionMask.Modify) != 0)
                str += "M";
            if ((perms & (int)PermissionMask.Copy) != 0)
                str += "C";
            if ((perms & (int)PermissionMask.Transfer) != 0)
                str += "T";
            if (str == "")
                str = ".";
            return str;
        }

        /// <summary>
        /// Applies an object's folded permissions to its regular permissions.
        /// </summary>
        /// <param name="foldedPerms">The folded permissions. Only the lowest 7 bits are examined.</param>
        /// <param name="mainPerms">The permissions variable to modify.</param>
        public static void ApplyFoldedPermissions(uint foldedPerms, ref uint mainPerms)
        {
            if ((foldedPerms & 7) == 0)
                return; // assume that if the folded permissions are 0 then this means that they weren't actually recorded

            if ((foldedPerms & ((uint)PermissionMask.Copy >> 13)) == 0)
                mainPerms &= ~(uint)PermissionMask.Copy;
            if ((foldedPerms & ((uint)PermissionMask.Transfer >> 13)) == 0)
                mainPerms &= ~(uint)PermissionMask.Transfer;
            if ((foldedPerms & ((uint)PermissionMask.Modify >> 13)) == 0)
                mainPerms &= ~(uint)PermissionMask.Modify;
        }

    }
}