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394 lines
16 KiB
C
394 lines
16 KiB
C
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* Copyright (c) 2004, Apple Computer, Inc. and The Mozilla Foundation.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of Apple Computer, Inc. ("Apple") or The Mozilla
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* Foundation ("Mozilla") nor the names of their contributors may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE, MOZILLA AND THEIR CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE, MOZILLA OR
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* THEIR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef _NP_RUNTIME_H_
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#define _NP_RUNTIME_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "nptypes.h"
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/*
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This API is used to facilitate binding code written in C to script
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objects. The API in this header does not assume the presence of a
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user agent. That is, it can be used to bind C code to scripting
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environments outside of the context of a user agent.
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However, the normal use of the this API is in the context of a
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scripting environment running in a browser or other user agent.
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In particular it is used to support the extended Netscape
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script-ability API for plugins (NP-SAP). NP-SAP is an extension
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of the Netscape plugin API. As such we have adopted the use of
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the "NP" prefix for this API.
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The following NP{N|P}Variables were added to the Netscape plugin
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API (in npapi.h):
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NPNVWindowNPObject
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NPNVPluginElementNPObject
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NPPVpluginScriptableNPObject
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These variables are exposed through NPN_GetValue() and
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NPP_GetValue() (respectively) and are used to establish the
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initial binding between the user agent and native code. The DOM
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objects in the user agent can be examined and manipulated using
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the NPN_ functions that operate on NPObjects described in this
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header.
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To the extent possible the assumptions about the scripting
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language used by the scripting environment have been minimized.
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*/
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#define NP_BEGIN_MACRO do {
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#define NP_END_MACRO } while (0)
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/*
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Objects (non-primitive data) passed between 'C' and script is
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always wrapped in an NPObject. The 'interface' of an NPObject is
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described by an NPClass.
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*/
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typedef struct NPObject NPObject;
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typedef struct NPClass NPClass;
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typedef char NPUTF8;
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typedef struct _NPString {
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const NPUTF8 *UTF8Characters;
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uint32_t UTF8Length;
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} NPString;
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typedef enum {
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NPVariantType_Void,
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NPVariantType_Null,
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NPVariantType_Bool,
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NPVariantType_Int32,
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NPVariantType_Double,
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NPVariantType_String,
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NPVariantType_Object
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} NPVariantType;
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typedef struct _NPVariant {
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NPVariantType type;
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union {
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bool boolValue;
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int32_t intValue;
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double doubleValue;
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NPString stringValue;
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NPObject *objectValue;
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} value;
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} NPVariant;
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/*
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NPN_ReleaseVariantValue is called on all 'out' parameters
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references. Specifically it is to be called on variants that own
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their value, as is the case with all non-const NPVariant*
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arguments after a successful call to any methods (except this one)
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in this API.
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After calling NPN_ReleaseVariantValue, the type of the variant
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will be NPVariantType_Void.
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*/
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void NPN_ReleaseVariantValue(NPVariant *variant);
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#define NPVARIANT_IS_VOID(_v) ((_v).type == NPVariantType_Void)
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#define NPVARIANT_IS_NULL(_v) ((_v).type == NPVariantType_Null)
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#define NPVARIANT_IS_BOOLEAN(_v) ((_v).type == NPVariantType_Bool)
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#define NPVARIANT_IS_INT32(_v) ((_v).type == NPVariantType_Int32)
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#define NPVARIANT_IS_DOUBLE(_v) ((_v).type == NPVariantType_Double)
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#define NPVARIANT_IS_STRING(_v) ((_v).type == NPVariantType_String)
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#define NPVARIANT_IS_OBJECT(_v) ((_v).type == NPVariantType_Object)
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#define NPVARIANT_TO_BOOLEAN(_v) ((_v).value.boolValue)
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#define NPVARIANT_TO_INT32(_v) ((_v).value.intValue)
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#define NPVARIANT_TO_DOUBLE(_v) ((_v).value.doubleValue)
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#define NPVARIANT_TO_STRING(_v) ((_v).value.stringValue)
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#define NPVARIANT_TO_OBJECT(_v) ((_v).value.objectValue)
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#define VOID_TO_NPVARIANT(_v) \
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NP_BEGIN_MACRO \
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(_v).type = NPVariantType_Void; \
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(_v).value.objectValue = nullptr; \
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NP_END_MACRO
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#define NULL_TO_NPVARIANT(_v) \
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NP_BEGIN_MACRO \
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(_v).type = NPVariantType_Null; \
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(_v).value.objectValue = nullptr; \
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NP_END_MACRO
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#define BOOLEAN_TO_NPVARIANT(_val, _v) \
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NP_BEGIN_MACRO \
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(_v).type = NPVariantType_Bool; \
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(_v).value.boolValue = !!(_val); \
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NP_END_MACRO
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#define INT32_TO_NPVARIANT(_val, _v) \
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NP_BEGIN_MACRO \
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(_v).type = NPVariantType_Int32; \
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(_v).value.intValue = _val; \
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NP_END_MACRO
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#define DOUBLE_TO_NPVARIANT(_val, _v) \
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NP_BEGIN_MACRO \
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(_v).type = NPVariantType_Double; \
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(_v).value.doubleValue = _val; \
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NP_END_MACRO
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#define STRINGZ_TO_NPVARIANT(_val, _v) \
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NP_BEGIN_MACRO \
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(_v).type = NPVariantType_String; \
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NPString str = { _val, (uint32_t)(strlen(_val)) }; \
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(_v).value.stringValue = str; \
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NP_END_MACRO
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#define STRINGN_TO_NPVARIANT(_val, _len, _v) \
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NP_BEGIN_MACRO \
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(_v).type = NPVariantType_String; \
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NPString str = { _val, (uint32_t)(_len) }; \
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(_v).value.stringValue = str; \
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NP_END_MACRO
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#define OBJECT_TO_NPVARIANT(_val, _v) \
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NP_BEGIN_MACRO \
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(_v).type = NPVariantType_Object; \
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(_v).value.objectValue = _val; \
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NP_END_MACRO
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/*
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Type mappings (JavaScript types have been used for illustration
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purposes):
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JavaScript to C (NPVariant with type:)
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undefined NPVariantType_Void
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null NPVariantType_Null
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Boolean NPVariantType_Bool
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Number NPVariantType_Double or NPVariantType_Int32
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String NPVariantType_String
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Object NPVariantType_Object
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C (NPVariant with type:) to JavaScript
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NPVariantType_Void undefined
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NPVariantType_Null null
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NPVariantType_Bool Boolean
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NPVariantType_Int32 Number
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NPVariantType_Double Number
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NPVariantType_String String
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NPVariantType_Object Object
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*/
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typedef void *NPIdentifier;
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/*
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NPObjects have methods and properties. Methods and properties are
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identified with NPIdentifiers. These identifiers may be reflected
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in script. NPIdentifiers can be either strings or integers, IOW,
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methods and properties can be identified by either strings or
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integers (i.e. foo["bar"] vs foo[1]). NPIdentifiers can be
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compared using ==. In case of any errors, the requested
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NPIdentifier(s) will be nullptr. NPIdentifier lifetime is controlled
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by the browser. Plugins do not need to worry about memory management
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with regards to NPIdentifiers.
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*/
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NPIdentifier NPN_GetStringIdentifier(const NPUTF8 *name);
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void NPN_GetStringIdentifiers(const NPUTF8 **names, int32_t nameCount,
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NPIdentifier *identifiers);
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NPIdentifier NPN_GetIntIdentifier(int32_t intid);
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bool NPN_IdentifierIsString(NPIdentifier identifier);
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/*
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The NPUTF8 returned from NPN_UTF8FromIdentifier SHOULD be freed.
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*/
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NPUTF8 *NPN_UTF8FromIdentifier(NPIdentifier identifier);
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/*
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Get the integer represented by identifier. If identifier is not an
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integer identifier, the behaviour is undefined.
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*/
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int32_t NPN_IntFromIdentifier(NPIdentifier identifier);
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/*
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NPObject behavior is implemented using the following set of
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callback functions.
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The NPVariant *result argument of these functions (where
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applicable) should be released using NPN_ReleaseVariantValue().
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*/
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typedef NPObject *(*NPAllocateFunctionPtr)(NPP npp, NPClass *aClass);
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typedef void (*NPDeallocateFunctionPtr)(NPObject *npobj);
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typedef void (*NPInvalidateFunctionPtr)(NPObject *npobj);
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typedef bool (*NPHasMethodFunctionPtr)(NPObject *npobj, NPIdentifier name);
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typedef bool (*NPInvokeFunctionPtr)(NPObject *npobj, NPIdentifier name,
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const NPVariant *args, uint32_t argCount,
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NPVariant *result);
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typedef bool (*NPInvokeDefaultFunctionPtr)(NPObject *npobj,
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const NPVariant *args,
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uint32_t argCount,
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NPVariant *result);
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typedef bool (*NPHasPropertyFunctionPtr)(NPObject *npobj, NPIdentifier name);
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typedef bool (*NPGetPropertyFunctionPtr)(NPObject *npobj, NPIdentifier name,
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NPVariant *result);
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typedef bool (*NPSetPropertyFunctionPtr)(NPObject *npobj, NPIdentifier name,
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const NPVariant *value);
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typedef bool (*NPRemovePropertyFunctionPtr)(NPObject *npobj,
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NPIdentifier name);
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typedef bool (*NPEnumerationFunctionPtr)(NPObject *npobj, NPIdentifier **value,
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uint32_t *count);
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typedef bool (*NPConstructFunctionPtr)(NPObject *npobj,
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const NPVariant *args,
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uint32_t argCount,
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NPVariant *result);
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/*
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NPObjects returned by create, retain, invoke, and getProperty pass
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a reference count to the caller. That is, the callee adds a
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reference count which passes to the caller. It is the caller's
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responsibility to release the returned object.
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NPInvokeFunctionPtr function may return 0 to indicate a void
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result.
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NPInvalidateFunctionPtr is called by the scripting environment
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when the native code is shutdown. Any attempt to message a
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NPObject instance after the invalidate callback has been
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called will result in undefined behavior, even if the native code
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is still retaining those NPObject instances. (The runtime
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will typically return immediately, with 0 or nullptr, from an
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attempt to dispatch to a NPObject, but this behavior should not
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be depended upon.)
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The NPEnumerationFunctionPtr function may pass an array of
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NPIdentifiers back to the caller. The callee allocs the memory of
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the array using NPN_MemAlloc(), and it's the caller's responsibility
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to release it using NPN_MemFree().
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*/
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struct NPClass
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{
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uint32_t structVersion;
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NPAllocateFunctionPtr allocate;
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NPDeallocateFunctionPtr deallocate;
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NPInvalidateFunctionPtr invalidate;
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NPHasMethodFunctionPtr hasMethod;
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NPInvokeFunctionPtr invoke;
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NPInvokeDefaultFunctionPtr invokeDefault;
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NPHasPropertyFunctionPtr hasProperty;
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NPGetPropertyFunctionPtr getProperty;
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NPSetPropertyFunctionPtr setProperty;
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NPRemovePropertyFunctionPtr removeProperty;
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NPEnumerationFunctionPtr enumerate;
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NPConstructFunctionPtr construct;
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};
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#define NP_CLASS_STRUCT_VERSION 3
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#define NP_CLASS_STRUCT_VERSION_ENUM 2
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#define NP_CLASS_STRUCT_VERSION_CTOR 3
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#define NP_CLASS_STRUCT_VERSION_HAS_ENUM(npclass) \
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((npclass)->structVersion >= NP_CLASS_STRUCT_VERSION_ENUM)
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#define NP_CLASS_STRUCT_VERSION_HAS_CTOR(npclass) \
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((npclass)->structVersion >= NP_CLASS_STRUCT_VERSION_CTOR)
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struct NPObject {
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NPClass *_class;
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uint32_t referenceCount;
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/*
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* Additional space may be allocated here by types of NPObjects
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*/
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};
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/*
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If the class has an allocate function, NPN_CreateObject invokes
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that function, otherwise a NPObject is allocated and
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returned. This method will initialize the referenceCount member of
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the NPObject to 1.
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*/
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NPObject *NPN_CreateObject(NPP npp, NPClass *aClass);
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/*
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Increment the NPObject's reference count.
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*/
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NPObject *NPN_RetainObject(NPObject *npobj);
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/*
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Decremented the NPObject's reference count. If the reference
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count goes to zero, the class's destroy function is invoke if
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specified, otherwise the object is freed directly.
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*/
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void NPN_ReleaseObject(NPObject *npobj);
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/*
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Functions to access script objects represented by NPObject.
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Calls to script objects are synchronous. If a function returns a
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value, it will be supplied via the result NPVariant
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argument. Successful calls will return true, false will be
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returned in case of an error.
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Calls made from plugin code to script must be made from the thread
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on which the plugin was initialized.
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*/
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bool NPN_Invoke(NPP npp, NPObject *npobj, NPIdentifier methodName,
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const NPVariant *args, uint32_t argCount, NPVariant *result);
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bool NPN_InvokeDefault(NPP npp, NPObject *npobj, const NPVariant *args,
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uint32_t argCount, NPVariant *result);
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bool NPN_Evaluate(NPP npp, NPObject *npobj, NPString *script,
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NPVariant *result);
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bool NPN_GetProperty(NPP npp, NPObject *npobj, NPIdentifier propertyName,
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NPVariant *result);
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bool NPN_SetProperty(NPP npp, NPObject *npobj, NPIdentifier propertyName,
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const NPVariant *value);
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bool NPN_RemoveProperty(NPP npp, NPObject *npobj, NPIdentifier propertyName);
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bool NPN_HasProperty(NPP npp, NPObject *npobj, NPIdentifier propertyName);
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bool NPN_HasMethod(NPP npp, NPObject *npobj, NPIdentifier methodName);
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bool NPN_Enumerate(NPP npp, NPObject *npobj, NPIdentifier **identifier,
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uint32_t *count);
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bool NPN_Construct(NPP npp, NPObject *npobj, const NPVariant *args,
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uint32_t argCount, NPVariant *result);
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/*
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NPN_SetException may be called to trigger a script exception upon
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return from entry points into NPObjects. Typical usage:
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NPN_SetException (npobj, message);
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*/
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void NPN_SetException(NPObject *npobj, const NPUTF8 *message);
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#ifdef __cplusplus
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}
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#endif
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#endif
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