05e18833ac
--HG-- extra : convert_revision : svn%3A39bc706e-5318-0410-9160-8a85361fbb7c/trunk%402479
365 lines
13 KiB
C++
365 lines
13 KiB
C++
/**
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* vim: set ts=4 :
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* =============================================================================
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* SourceMod
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* Copyright (C) 2004-2008 AlliedModders LLC. All rights reserved.
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* =============================================================================
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*
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License, version 3.0, as published by the
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* Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* As a special exception, AlliedModders LLC gives you permission to link the
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* code of this program (as well as its derivative works) to "Half-Life 2," the
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* "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software
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* by the Valve Corporation. You must obey the GNU General Public License in
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* all respects for all other code used. Additionally, AlliedModders LLC grants
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* this exception to all derivative works. AlliedModders LLC defines further
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* exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),
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* or <http://www.sourcemod.net/license.php>.
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*
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* Version: $Id$
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*/
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#ifndef _INCLUDE_SOURCEMOD_HANDLESYSTEM_INTERFACE_H_
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#define _INCLUDE_SOURCEMOD_HANDLESYSTEM_INTERFACE_H_
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/**
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* @file IHandleSys.h
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* @brief Defines the interface for creating, reading, and removing Handles.
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*
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* The Handle system abstracts generic pointers into typed objects represented by
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* 32bit codes. This is extremely useful for verifying data integrity and cross-platform
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* support in SourcePawn scripts. When a Plugin unloads, all its Handles are freed, ensuring
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* that no memory leaks are present, They have reference counts and thus can be duplicated,
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* or cloned, and are safe to pass between Plugins even if one is unloaded.
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*
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* Handles are created with a given type (custom types may be created). They can have
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* per-Identity permissions for deletion, reading, and cloning. They also support generic
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* operations. For example, deleting a Handle will call that type's destructor on the generic
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* pointer, making cleanup easier for users and eliminating memory leaks.
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*/
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#include <IShareSys.h>
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#include <sp_vm_types.h>
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#define SMINTERFACE_HANDLESYSTEM_NAME "IHandleSys"
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#define SMINTERFACE_HANDLESYSTEM_VERSION 3
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/** Specifies no Identity */
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#define DEFAULT_IDENTITY NULL
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/** Specifies no Type. This is invalid for everything but reading a Handle. */
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#define NO_HANDLE_TYPE 0
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/** Specifies an invalid/NULL Handle */
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#define BAD_HANDLE 0
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namespace SourceMod
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{
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/**
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* @brief Represents a Handle Type ID.
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*/
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typedef unsigned int HandleType_t;
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/**
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* @brief Represents a Handle ID.
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*/
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typedef unsigned int Handle_t;
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/*
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* About type checking:
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* Types can be inherited - a Parent type ("Supertype") can have child types.
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* When accessing handles, type checking is done. This table shows how this is resolved:
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*
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* HANDLE CHECK -> RESULT
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* ------ ----- ------
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* Parent Parent Success
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* Parent Child Fail
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* Child Parent Success
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* Child Child Success
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*/
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/**
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* @brief Lists the possible handle error codes.
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*/
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enum HandleError
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{
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HandleError_None = 0, /**< No error */
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HandleError_Changed, /**< The handle has been freed and reassigned */
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HandleError_Type, /**< The handle has a different type registered */
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HandleError_Freed, /**< The handle has been freed */
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HandleError_Index, /**< generic internal indexing error */
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HandleError_Access, /**< No access permitted to free this handle */
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HandleError_Limit, /**< The limited number of handles has been reached */
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HandleError_Identity, /**< The identity token was not usable */
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HandleError_Owner, /**< Owners do not match for this operation */
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HandleError_Version, /**< Unrecognized security structure version */
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HandleError_Parameter, /**< An invalid parameter was passed */
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HandleError_NoInherit, /**< This type cannot be inherited */
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};
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/**
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* @brief Lists access rights specific to a type.
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*/
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enum HTypeAccessRight
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{
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HTypeAccess_Create = 0, /**< Handles of this type can be created (DEFAULT=false) */
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HTypeAccess_Inherit, /**< Sub-types can inherit this type (DEFAULT=false) */
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/* -------------- */
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HTypeAccess_TOTAL, /**< Total number of type access rights */
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};
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/**
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* @brief Lists access rights specific to a Handle.
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*
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* These rights are exclusive. For example, you do not need "read" access to delete or clone.
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*/
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enum HandleAccessRight
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{
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HandleAccess_Read, /**< Can be read (DEFAULT=ident only) */
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HandleAccess_Delete, /**< Can be deleted (DEFAULT=owner only) */
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HandleAccess_Clone, /**< Can be cloned (DEFAULT=any) */
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/* ------------- */
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HandleAccess_TOTAL, /**< Total number of access rights */
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};
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/** Access is restricted to the identity */
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#define HANDLE_RESTRICT_IDENTITY (1<<0)
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/** Access is restricted to the owner */
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#define HANDLE_RESTRICT_OWNER (1<<1)
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/**
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* @brief This is used to define per-type access rights.
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*/
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struct TypeAccess
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{
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/** Constructor */
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TypeAccess()
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{
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hsVersion = SMINTERFACE_HANDLESYSTEM_VERSION;
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}
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unsigned int hsVersion; /**< Handle API version */
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IdentityToken_t *ident; /**< Identity owning this type */
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bool access[HTypeAccess_TOTAL]; /**< Access array */
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};
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/**
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* @brief This is used to define per-Handle access rights.
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*/
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struct HandleAccess
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{
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/** Constructor */
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HandleAccess()
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{
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hsVersion = SMINTERFACE_HANDLESYSTEM_VERSION;
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}
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unsigned int hsVersion; /**< Handle API version */
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unsigned int access[HandleAccess_TOTAL]; /**< Access array */
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};
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/**
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* @brief This pair of tokens is used for identification.
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*/
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struct HandleSecurity
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{
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HandleSecurity()
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{
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}
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HandleSecurity(IdentityToken_t *owner, IdentityToken_t *identity)
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: pOwner(owner), pIdentity(identity)
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{
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}
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IdentityToken_t *pOwner; /**< Owner of the Handle */
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IdentityToken_t *pIdentity; /**< Owner of the Type */
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};
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/**
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* @brief Hooks type-specific Handle operations.
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*/
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class IHandleTypeDispatch
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{
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public:
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/** Returns the Handle API version */
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virtual unsigned int GetDispatchVersion()
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{
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return SMINTERFACE_HANDLESYSTEM_VERSION;
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}
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public:
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/**
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* @brief Called when destroying a handle. Must be implemented.
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*
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* @param type Handle type.
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* @param object Handle internal object.
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*/
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virtual void OnHandleDestroy(HandleType_t type, void *object) =0;
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/**
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* @brief Called to get the size of a handle's memory usage in bytes.
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* Implementation is optional.
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*
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* @param type Handle type.
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* @param object Handle internal object.
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* @param pSize Pointer to store the approximate memory usage in bytes.
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* @return True on success, false if not implemented.
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*/
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virtual bool GetHandleApproxSize(HandleType_t type, void *object, unsigned int *pSize)
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{
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return false;
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}
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};
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/**
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* @brief Provides functions for managing Handles.
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*/
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class IHandleSys : public SMInterface
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{
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public:
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virtual unsigned int GetInterfaceVersion()
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{
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return SMINTERFACE_HANDLESYSTEM_VERSION;
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}
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virtual const char *GetInterfaceName()
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{
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return SMINTERFACE_HANDLESYSTEM_NAME;
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}
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public:
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/**
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* @brief Creates a new Handle type.
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* NOTE: Currently, a child type may not have its own children.
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* NOTE: Handle names must be unique if not private.
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*
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* @param name Name of handle type (NULL or "" to be anonymous)
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* @param dispatch Pointer to a valid IHandleTypeDispatch object.
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* @param parent Parent handle to inherit from, 0 for none.
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* @param typeAccess Pointer to a TypeAccess object, NULL to use default
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* or inherited permissions. Pointer can be temporary.
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* @param hndlAccess Pointer to a HandleAccess object to define default
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* default permissions on each Handle. NULL to use default
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* permissions.
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* @param ident Security token for any permissions. If typeAccess is NULL, this
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* becomes the owning identity.
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* @param err Optional pointer to store an error code on failure (undefined on success).
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* @return A new HandleType_t unique ID, or 0 on failure.
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*/
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virtual HandleType_t CreateType(const char *name,
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IHandleTypeDispatch *dispatch,
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HandleType_t parent,
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const TypeAccess *typeAccess,
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const HandleAccess *hndlAccess,
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IdentityToken_t *ident,
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HandleError *err) =0;
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/**
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* @brief Removes a handle type.
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* NOTE: This removes all child types.
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*
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* @param type Type chain to remove.
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* @param ident Identity token. Removal fails if the token does not match.
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* @return True on success, false on failure.
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*/
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virtual bool RemoveType(HandleType_t type, IdentityToken_t *ident) =0;
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/**
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* @brief Finds a handle type by name.
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*
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* @param name Name of handle type to find (anonymous not allowed).
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* @param type Address to store found handle in (if not found, undefined).
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* @return True if found, false otherwise.
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*/
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virtual bool FindHandleType(const char *name, HandleType_t *type) =0;
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/**
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* @brief Creates a new handle.
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*
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* @param type Type to use on the handle.
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* @param object Object to bind to the handle.
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* @param owner Owner of the new Handle (may be NULL).
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* @param ident Identity for type access if needed (may be NULL).
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* @param err Optional pointer to store an error code on failure (undefined on success).
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* @return A new Handle_t, or 0 on failure.
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*/
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virtual Handle_t CreateHandle(HandleType_t type,
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void *object,
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IdentityToken_t *owner,
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IdentityToken_t *ident,
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HandleError *err) =0;
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/**
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* @brief Frees the memory associated with a handle and calls any destructors.
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* NOTE: This function will decrement the internal reference counter. It will
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* only perform any further action if the counter hits 0.
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*
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* @param handle Handle_t identifier to destroy.
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* @param pSecurity Security information struct (may be NULL).
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* @return A HandleError error code.
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*/
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virtual HandleError FreeHandle(Handle_t handle, const HandleSecurity *pSecurity) =0;
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/**
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* @brief Clones a handle by adding to its internal reference count. Its data,
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* type, and security permissions remain the same.
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*
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* @param handle Handle to duplicate. Any non-free handle target is valid.
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* @param newhandle Stores the duplicated handle in the pointer (must not be NULL).
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* @param newOwner New owner of cloned handle.
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* @param pSecurity Security information struct (may be NULL).
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* @return A HandleError error code.
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*/
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virtual HandleError CloneHandle(Handle_t handle,
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Handle_t *newhandle,
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IdentityToken_t *newOwner,
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const HandleSecurity *pSecurity) =0;
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/**
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* @brief Retrieves the contents of a handle.
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*
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* @param handle Handle_t from which to retrieve contents.
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* @param type Expected type to read as. 0 ignores typing rules.
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* @param pSecurity Security information struct (may be NULL).
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* @param object Optional address to store object in.
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* @return HandleError error code.
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*/
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virtual HandleError ReadHandle(Handle_t handle,
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HandleType_t type,
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const HandleSecurity *pSecurity,
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void **object) =0;
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/**
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* @brief Sets access permissions on one or more structures.
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*
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* @param pTypeAccess Optional TypeAccess buffer to initialize with the default values.
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* @param pHandleAccess Optional HandleAccess buffer to initialize with the default values.
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* @return True on success, false if version is unsupported.
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*/
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virtual bool InitAccessDefaults(TypeAccess *pTypeAccess, HandleAccess *pHandleAccess) =0;
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/**
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* @brief Creates a new handle.
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*
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* @param type Type to use on the handle.
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* @param object Object to bind to the handle.
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* @param pSec Security pointer; pOwner is written as the owner,
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* pIdent is used as the parent identity for authorization.
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* @param pAccess Access right descriptor for the Handle; NULL for type defaults.
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* @param err Optional pointer to store an error code on failure (undefined on success).
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* @return A new Handle_t, or 0 on failure.
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*/
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virtual Handle_t CreateHandleEx(HandleType_t type,
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void *object,
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const HandleSecurity *pSec,
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const HandleAccess *pAccess,
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HandleError *err) =0;
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};
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}
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#endif //_INCLUDE_SOURCEMOD_HANDLESYSTEM_INTERFACE_H_
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