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diff --git a/Adobe_SigHandler/Adobe.PDF-AS-SigHandler/sources/import/API/PICommon.h b/Adobe_SigHandler/Adobe.PDF-AS-SigHandler/sources/import/API/PICommon.h
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+/*********************************************************************
+
+ ADOBE SYSTEMS INCORPORATED
+ Copyright (C) 1994-2006 Adobe Systems Incorporated
+ All rights reserved.
+
+ NOTICE: Adobe permits you to use, modify, and distribute this file
+ in accordance with the terms of the Adobe license agreement
+ accompanying it. If you have received this file from a source other
+ than Adobe, then your use, modification, or distribution of it
+ requires the prior written permission of Adobe.
+
+ ---------------------------------------------------------------------
+
+ PICommon.h
+
+ - Globals and function declarations used by every plug-in.
+
+*********************************************************************/
+
+#ifndef _H_PICommon
+#define _H_PICommon
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef PLUGIN
+#define PLUGIN 1
+#endif
+
+#include "PIVersn.h"
+#include "PIRequir.h"	/* PIRequir.h may be edited by authors to reduce Plug-in's footprint */
+extern ExtensionID gExtensionID;
+
+
+/* 
+** Protype for PIHandshake(), which  must be provided by the plug-in author.
+*/
+extern ACCB1 ASBool ACCB2 PIHandshake(ASUns32 handshakeVersion, void *handshakeData);
+
+/*
+** Backwards compatibility section.
+These macros reflect early API architecture. Callback-related things ended up part of the AS
+mechanism. The other three macros are miscellaneous convenience macros. 
+*/
+#define CallbackCreate(a,b) ASCallbackCreate(b)
+#define CallbackCreateProto(funcType, proc) ASCallbackCreateProto(funcType, proc)
+#define CallbackCreateReplacement(sel, proc) ASCallbackCreateProto(sel##PROTO, proc)
+#define CallbackCreateNotification(nsel, proc)	ASCallbackCreateProto(nsel##NPROTO, proc)
+#if PI_ACROSUPPORT_VERSION >= 0x00050000
+/**
+	Replaces one of the Acrobat viewer's built-in methods. The method being replaced must be one of the ReplaceableMethods. 
+	The method's HFTEntryReplaceable flag is automatically set, allowing it to be subsequently replaced.
+
+	<p>All clients, and the Acrobat viewer itself, share a single copy of each HFT. As a result, when a client replaces the 
+	implementation of a method, all other clients and the Acrobat viewer also use the new implementation of that method. 
+	In addition, once a method's implementation has been replaced, there is no way to remove the new implementation without restarting the Acrobat viewer.</p>
+
+	@note The CALL_REPLACED_PROC macro is available to call the previous HFT entry function that was replaced.
+
+	@param hft		The HFT containing the method to replace. For example, gAcroViewHFT.
+	@param sel		The selector for the method to replace. The name must have the characters <code>SEL</code> appended. For example, <code>AVAlertSEL</code>.
+	@param proc		A callback containing the replacement method. The callback must have been created using ASCallbackCreateReplacement().
+
+	@example	<code>myAlertCallback = ASCallbackCreateReplacement(AVAlertSEL, myAlert);
+				<p>REPLACE(gAcroViewHFT, AVAlertSEL, myAlertCallback);</p></code>
+
+	@see CALL_REPLACED_PROC
+	@see ASCallbackCreateReplacement
+	@see HFTReplaceEntry
+	@ref ReplaceableMethods
+*/
+#define REPLACE(hft, sel, proc) HFTReplaceEntryEx((hft), sel, (proc), gExtensionID, HFTEntryReplaceable)
+#else
+#define REPLACE(hft, sel, proc) HFTReplaceEntry((hft), sel, (proc), HFTEntryReplaceable)
+#endif
+/**
+	Calls the previous implementation of a replaced method (that is, the code that would have been executed before the method was replaced 
+	using <code>REPLACE</code>).
+
+	@param hft		The HFT containing the replaced method to execute. For example, gAcroViewHFT.
+	@param sel		The selector for the replaced method to execute. The name must have the characters <code>SEL</code> appended. 
+					For example, <code>AVAlertSEL</code>.
+	@param oldProc	The callback whose previous implementation is called. A method may be replaced more than once, and all replacements 
+					for a particular method are kept in a linked list. <code>oldProc</code> must be an element in that linked list, 
+					and the entry before <code>oldProc</code> is the one that is called.
+
+	@example	<code>CALL_REPLACED_PROC(gAcroViewHFT, AVAlertSEL, myAlertCallback)(iconType, gsm, button1, button2, button3, beep);</code>
+
+	@see REPLACE
+	@see HFTGetReplacedEntry
+*/
+#define CALL_REPLACED_PROC(hft, sel, oldProc) (*((sel##PROTO)(HFTGetReplacedEntry((hft), sel, (oldProc)))))
+
+/* assuming most people won't cast the second parameter... */
+/**
+	A macro to register a notification. It uses AVAppRegisterNotification().
+*/
+#define REGISTER_NOTIFICATION(nselName, proc, rock) AVAppRegisterNotification(nselName##NSEL, gExtensionID, (void*)(proc), (rock))
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _H_PICOMMON */