示例#1
0
        internal bool IsSubsetOfHelper(PermissionSet target, IsSubsetOfType type, out IPermission firstPermThatFailed, bool ignoreNonCas)
        {
    #if _DEBUG
            if (debug)     
                DEBUG_WRITE("IsSubsetOf\n" +
                            "Other:\n" +
                            (target == null ? "<null>" : target.ToString()) +
                            "\nMe:\n" +
                            ToString());
    #endif
    
            firstPermThatFailed = null;
            if (target == null || target.FastIsEmpty())
            {
                if(this.IsEmpty())
                    return true;
                else
                {
                    firstPermThatFailed = GetFirstPerm();
                    return false;
                }
            }
            else if (this.IsUnrestricted() && !target.IsUnrestricted())
                return false;
            else if (this.m_permSet == null)
                return true;
            else
            {
                target.CheckSet();

                for (int i = m_permSet.GetStartingIndex(); i <= this.m_permSet.GetMaxUsedIndex(); ++i)
                {
                    IPermission thisPerm = this.GetPermission(i);
                    if (thisPerm == null || thisPerm.IsSubsetOf(null))
                        continue;

                    IPermission targetPerm = target.GetPermission(i);
#if _DEBUG                    
                    PermissionToken token = (PermissionToken)PermissionToken.s_tokenSet.GetItem( i );
                    Contract.Assert(targetPerm == null || (token.m_type & PermissionTokenType.DontKnow) == 0, "Token not properly initialized");
#endif

                    if (target.m_Unrestricted)
                        continue;

                    // targetPerm can be null here, but that is fine since it thisPerm is a subset
                    // of empty/null then we can continue in the loop.
                    CodeAccessPermission cap = thisPerm as CodeAccessPermission;
                    if(cap == null)
                    {
                        if (!ignoreNonCas && !thisPerm.IsSubsetOf( targetPerm ))
                        {
                            firstPermThatFailed = thisPerm;
                            return false;
                        }
                    }
                    else
                    {
                        firstPermThatFailed = thisPerm;
                        switch(type)
                        {
                        case IsSubsetOfType.Normal:
                            if (!thisPerm.IsSubsetOf( targetPerm ))
                                return false;
                            break;
                        case IsSubsetOfType.CheckDemand:
                            if (!cap.CheckDemand( (CodeAccessPermission)targetPerm ))
                                return false;
                            break;
                        case IsSubsetOfType.CheckPermitOnly:
                            if (!cap.CheckPermitOnly( (CodeAccessPermission)targetPerm ))
                                return false;
                            break;
                        case IsSubsetOfType.CheckAssertion:
                            if (!cap.CheckAssert( (CodeAccessPermission)targetPerm ))
                                return false;
                            break;
                        }
                        firstPermThatFailed = null;
                    }
                }
            }

            return true;
        }
        internal bool IsSubsetOfHelper(PermissionSet target, IsSubsetOfType type, out IPermission firstPermThatFailed, bool ignoreNonCas)
        {
            firstPermThatFailed = null;
            if ((target == null) || target.FastIsEmpty())
            {
                if (this.IsEmpty())
                {
                    return true;
                }
                firstPermThatFailed = this.GetFirstPerm();
                return false;
            }
            if (this.IsUnrestricted() && !target.IsUnrestricted())
            {
                return false;
            }
            if (this.m_permSet != null)
            {
                target.CheckSet();
                for (int i = this.m_permSet.GetStartingIndex(); i <= this.m_permSet.GetMaxUsedIndex(); i++)
                {
                    IPermission permission = this.GetPermission(i);
                    if ((permission != null) && !permission.IsSubsetOf(null))
                    {
                        IPermission permission2 = target.GetPermission(i);
                        if (!target.m_Unrestricted)
                        {
                            CodeAccessPermission permission3 = permission as CodeAccessPermission;
                            if (permission3 == null)
                            {
                                if (!ignoreNonCas && !permission.IsSubsetOf(permission2))
                                {
                                    firstPermThatFailed = permission;
                                    return false;
                                }
                                continue;
                            }
                            firstPermThatFailed = permission;
                            switch (type)
                            {
                                case IsSubsetOfType.Normal:
                                    if (permission.IsSubsetOf(permission2))
                                    {
                                        break;
                                    }
                                    return false;

                                case IsSubsetOfType.CheckDemand:
                                    if (permission3.CheckDemand((CodeAccessPermission) permission2))
                                    {
                                        break;
                                    }
                                    return false;

                                case IsSubsetOfType.CheckPermitOnly:
                                    if (permission3.CheckPermitOnly((CodeAccessPermission) permission2))
                                    {
                                        break;
                                    }
                                    return false;

                                case IsSubsetOfType.CheckAssertion:
                                    if (permission3.CheckAssert((CodeAccessPermission) permission2))
                                    {
                                        break;
                                    }
                                    return false;
                            }
                            firstPermThatFailed = null;
                        }
                    }
                }
            }
            return true;
        }