fpdfsdk/src/fpdfdoc.cpp - pdfium - Git at Google

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com

 #include "../include/fsdk_define.h"
 #include "../include/fpdfdoc.h"

 static int THISMODULE = 0;

 static CPDF_Bookmark FindBookmark(const CPDF_BookmarkTree& tree, CPDF_Bookmark bookmark, const CFX_WideString& title)
 {
 	if (bookmark && bookmark.GetTitle().CompareNoCase(title) == 0) {
 		// First check this item
 		return bookmark;
 	}
 	// go into children items
 	CPDF_Bookmark child = tree.GetFirstChild(bookmark);
 	while (child) {
 		// check if this item
 		CPDF_Bookmark found = FindBookmark(tree, child, title);
 		if (found)
 			return found;
 		child = tree.GetNextSibling(child);
 	}
 	return CPDF_Bookmark();
 }

 DLLEXPORT FPDF_BOOKMARK STDCALL FPDFBookmark_GetFirstChild(FPDF_DOCUMENT document, FPDF_BOOKMARK pDict)
 {
     if (!document)
         return NULL;
     CPDF_Document* pDoc = (CPDF_Document*)document;
     CPDF_BookmarkTree tree(pDoc);
     CPDF_Bookmark bookmark = CPDF_Bookmark((CPDF_Dictionary*)pDict);
     return tree.GetFirstChild(bookmark).GetDict();
 }

 DLLEXPORT FPDF_BOOKMARK STDCALL FPDFBookmark_GetNextSibling(FPDF_DOCUMENT document, FPDF_BOOKMARK pDict)
 {
     if (!document || !pDict)
         return NULL;
     CPDF_Document* pDoc = (CPDF_Document*)document;
     CPDF_BookmarkTree tree(pDoc);
     CPDF_Bookmark bookmark = CPDF_Bookmark((CPDF_Dictionary*)pDict);
     return tree.GetNextSibling(bookmark).GetDict();
 }

 DLLEXPORT unsigned long STDCALL FPDFBookmark_GetTitle(FPDF_BOOKMARK pDict, void* buffer, unsigned long buflen)
 {
     if (!pDict)
         return 0;
     CPDF_Bookmark bookmark((CPDF_Dictionary*)pDict);
     CFX_WideString title = bookmark.GetTitle();
     CFX_ByteString encodedTitle = title.UTF16LE_Encode();
     unsigned long len = encodedTitle.GetLength();
     if (buffer && buflen >= len) {
         FXSYS_memcpy(buffer, encodedTitle.c_str(), len);
     }
     return len;
 }

 DLLEXPORT FPDF_BOOKMARK STDCALL FPDFBookmark_Find(FPDF_DOCUMENT document, FPDF_WIDESTRING title)
 {
 	if (!document)
 		return NULL;
 	if (!title || title[0] == 0)
 		return NULL;
 	CPDF_Document* pDoc = (CPDF_Document*)document;
 	CPDF_BookmarkTree tree(pDoc);
 	FX_STRSIZE len = CFX_WideString::WStringLength(title);
 	CFX_WideString encodedTitle = CFX_WideString::FromUTF16LE(title, len);
 	return FindBookmark(tree, CPDF_Bookmark(), encodedTitle).GetDict();
 }

 DLLEXPORT FPDF_DEST STDCALL FPDFBookmark_GetDest(FPDF_DOCUMENT document, FPDF_BOOKMARK pDict)
 {
 	if (!document)
 		return NULL;
 	if (!pDict)
 		return NULL;
 	CPDF_Bookmark bookmark((CPDF_Dictionary*)pDict);
 	CPDF_Document* pDoc = (CPDF_Document*)document;
 	CPDF_Dest dest = bookmark.GetDest(pDoc);
 	if (dest)
 		return dest.GetObject();
 	// If this bookmark is not directly associated with a dest, we try to get action
 	CPDF_Action action = bookmark.GetAction();
 	if (!action)
 		return NULL;
 	return action.GetDest(pDoc).GetObject();
 }

 DLLEXPORT FPDF_ACTION STDCALL FPDFBookmark_GetAction(FPDF_BOOKMARK pDict)
 {
 	if (!pDict)
 		return NULL;
 	CPDF_Bookmark bookmark((CPDF_Dictionary*)pDict);
 	return bookmark.GetAction().GetDict();
 }

 DLLEXPORT unsigned long STDCALL FPDFAction_GetType(FPDF_ACTION pDict)
 {
 	if (!pDict)
 		return 0;
 	CPDF_Action action((CPDF_Dictionary*)pDict);
 	CPDF_Action::ActionType type = action.GetType();
 	switch (type) {
 		case CPDF_Action::GoTo:
 			return PDFACTION_GOTO;
 		case CPDF_Action::GoToR:
 			return PDFACTION_REMOTEGOTO;
 		case CPDF_Action::URI:
 			return PDFACTION_URI;
 		case CPDF_Action::Launch:
 			return PDFACTION_LAUNCH;
 		default:
 			return PDFACTION_UNSUPPORTED;
 	}
 	return PDFACTION_UNSUPPORTED;
 }

 DLLEXPORT FPDF_DEST STDCALL FPDFAction_GetDest(FPDF_DOCUMENT document, FPDF_ACTION pDict)
 {
 	if (!document)
 		return NULL;
 	if (!pDict)
 		return NULL;
 	CPDF_Document* pDoc = (CPDF_Document*)document;
 	CPDF_Action action((CPDF_Dictionary*)pDict);
 	return action.GetDest(pDoc).GetObject();
 }

 DLLEXPORT unsigned long STDCALL FPDFAction_GetURIPath(FPDF_DOCUMENT document, FPDF_ACTION pDict,
 											  void* buffer, unsigned long buflen)
 {
 	if (!document)
 		return 0;
 	if (!pDict)
 		return 0;
 	CPDF_Document* pDoc = (CPDF_Document*)document;
 	CPDF_Action action((CPDF_Dictionary*)pDict);
 	CFX_ByteString path = action.GetURI(pDoc);
 	unsigned long len = path.GetLength() + 1;
 	if (buffer != NULL && buflen >= len)
 		FXSYS_memcpy(buffer, path.c_str(), len);
 	return len;
 }

 DLLEXPORT unsigned long STDCALL FPDFDest_GetPageIndex(FPDF_DOCUMENT document, FPDF_DEST pDict)
 {
 	if (!document)
 		return 0;
 	if (!pDict)
 		return 0;
 	CPDF_Document* pDoc = (CPDF_Document*)document;
 	CPDF_Dest dest((CPDF_Array*)pDict);
 	return dest.GetPageIndex(pDoc);
 }

 static void ReleaseLinkList(FX_LPVOID data)
 {
 	delete (CPDF_LinkList*)data;
 }

 DLLEXPORT FPDF_LINK STDCALL FPDFLink_GetLinkAtPoint(FPDF_PAGE page, double x, double y)
 {
 	if (!page)
 		return NULL;
 	CPDF_Page* pPage = (CPDF_Page*)page;
 	// Link list is stored with the document
 	CPDF_Document* pDoc = pPage->m_pDocument;
 	CPDF_LinkList* pLinkList = (CPDF_LinkList*)pDoc->GetPrivateData(&THISMODULE);
 	if (!pLinkList) {
 		pLinkList = FX_NEW CPDF_LinkList(pDoc);
 		pDoc->SetPrivateData(&THISMODULE, pLinkList, ReleaseLinkList);
 	}
 	return pLinkList->GetLinkAtPoint(pPage, (FX_FLOAT)x, (FX_FLOAT)y).GetDict();
 }

 DLLEXPORT FPDF_DEST STDCALL FPDFLink_GetDest(FPDF_DOCUMENT document, FPDF_LINK pDict)
 {
 	if (!document)
 		return NULL;
 	if (!pDict)
 		return NULL;
 	CPDF_Document* pDoc = (CPDF_Document*)document;
 	CPDF_Link link((CPDF_Dictionary*)pDict);
 	FPDF_DEST dest = link.GetDest(pDoc).GetObject();
 	if (dest)
 		return dest;
 	// If this link is not directly associated with a dest, we try to get action
 	CPDF_Action action = link.GetAction();
 	if (!action)
 		return NULL;
 	return action.GetDest(pDoc).GetObject();
 }

 DLLEXPORT FPDF_ACTION STDCALL FPDFLink_GetAction(FPDF_LINK pDict)
 {
 	if (!pDict)
 		return NULL;
 	CPDF_Link link((CPDF_Dictionary*)pDict);
 	return link.GetAction().GetDict();
 }

 DLLEXPORT FPDF_BOOL STDCALL FPDFLink_Enumerate(FPDF_PAGE page, int* startPos, FPDF_LINK* linkAnnot)
 {
 	if(!page || !startPos || !linkAnnot)
 		return FALSE;
 	CPDF_Page* pPage = (CPDF_Page*)page;
 	if(!pPage->m_pFormDict)
 		return FALSE;
 	CPDF_Array* pAnnots = pPage->m_pFormDict->GetArray("Annots");
 	if(!pAnnots)
 		return FALSE;
 	for (int i = *startPos; i < (int)pAnnots->GetCount(); i++) {
 		CPDF_Dictionary* pDict = (CPDF_Dictionary*)pAnnots->GetElementValue(i);
 		if (!pDict || pDict->GetType() != PDFOBJ_DICTIONARY)
 			continue;
 		if(pDict->GetString(FX_BSTRC("Subtype")).Equal(FX_BSTRC("Link"))) {
 			*startPos = i + 1;
 			*linkAnnot = (FPDF_LINK)pDict;
 			return TRUE;
 		}
 	}
 	return FALSE;
 }

 DLLEXPORT FPDF_BOOL STDCALL FPDFLink_GetAnnotRect(FPDF_LINK linkAnnot, FS_RECTF* rect)
 {
 	if(!linkAnnot || !rect)
 		return FALSE;
 	CPDF_Dictionary* pAnnotDict = (CPDF_Dictionary*)linkAnnot;
 	CPDF_Rect rt = pAnnotDict->GetRect(FX_BSTRC("Rect"));
 	rect->left = rt.left;
 	rect->bottom = rt.bottom;
 	rect->right = rt.right;
 	rect->top = rt.top;
 	return TRUE;
 }

 DLLEXPORT int STDCALL FPDFLink_CountQuadPoints(FPDF_LINK linkAnnot)
 {
 	if(!linkAnnot)
 		return 0;
 	CPDF_Dictionary* pAnnotDict = (CPDF_Dictionary*)linkAnnot;
 	CPDF_Array* pArray = pAnnotDict->GetArray(FX_BSTRC("QuadPoints"));
 	if (!pArray)
 		return 0;
 	else
 		return pArray->GetCount() / 8;
 }

 DLLEXPORT FPDF_BOOL STDCALL FPDFLink_GetQuadPoints(FPDF_LINK linkAnnot, int quadIndex, FS_QUADPOINTSF* quadPoints)
 {
 	if(!linkAnnot || !quadPoints)
 		return FALSE;
 	CPDF_Dictionary* pAnnotDict = (CPDF_Dictionary*)linkAnnot;
 	CPDF_Array* pArray = pAnnotDict->GetArray(FX_BSTRC("QuadPoints"));
 	if (pArray) {
 		if (quadIndex < 0 || quadIndex >= (int)pArray->GetCount()/8 || ((quadIndex*8+7) >= (int)pArray->GetCount()))
 			return FALSE;
 		quadPoints->x1 = pArray->GetNumber(quadIndex*8);
 		quadPoints->y1 = pArray->GetNumber(quadIndex*8+1);
 		quadPoints->x2 = pArray->GetNumber(quadIndex*8+2);
 		quadPoints->y2 = pArray->GetNumber(quadIndex*8+3);
 		quadPoints->x3 = pArray->GetNumber(quadIndex*8+4);
 		quadPoints->y3 = pArray->GetNumber(quadIndex*8+5);
 		quadPoints->x4 = pArray->GetNumber(quadIndex*8+6);
 		quadPoints->y4 = pArray->GetNumber(quadIndex*8+7);
 		return TRUE;
 	}
 	return FALSE;
 }

 DLLEXPORT unsigned long STDCALL FPDF_GetMetaText(FPDF_DOCUMENT doc, FPDF_BYTESTRING tag,
 												 void* buffer, unsigned long buflen)
 {
 	if (!doc || !tag)
 		return 0;
 	CPDF_Document* pDoc = (CPDF_Document*)doc;
 	// Get info dictionary
 	CPDF_Dictionary* pInfo = pDoc->GetInfo();
 	if (!pInfo)
 		return 0;
 	CFX_WideString text = pInfo->GetUnicodeText(tag);
 	// Use UTF-16LE encoding
 	CFX_ByteString encodedText = text.UTF16LE_Encode();
 	unsigned long len = encodedText.GetLength();
 	if (buffer && buflen >= len) {
 		FXSYS_memcpy(buffer, encodedText.c_str(), len);
 	}
 	return len;
 }
	// Copyright 2014 PDFium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com

	#include "../include/fsdk_define.h"
	#include "../include/fpdfdoc.h"

	static int THISMODULE = 0;

	static CPDF_Bookmark FindBookmark(const CPDF_BookmarkTree& tree, CPDF_Bookmark bookmark, const CFX_WideString& title)
	{
	if (bookmark && bookmark.GetTitle().CompareNoCase(title) == 0) {
	// First check this item
	return bookmark;
	}
	// go into children items
	CPDF_Bookmark child = tree.GetFirstChild(bookmark);
	while (child) {
	// check if this item
	CPDF_Bookmark found = FindBookmark(tree, child, title);
	if (found)
	return found;
	child = tree.GetNextSibling(child);
	}
	return CPDF_Bookmark();
	}

	DLLEXPORT FPDF_BOOKMARK STDCALL FPDFBookmark_GetFirstChild(FPDF_DOCUMENT document, FPDF_BOOKMARK pDict)
	{
	if (!document)
	return NULL;
	CPDF_Document* pDoc = (CPDF_Document*)document;
	CPDF_BookmarkTree tree(pDoc);
	CPDF_Bookmark bookmark = CPDF_Bookmark((CPDF_Dictionary*)pDict);
	return tree.GetFirstChild(bookmark).GetDict();
	}

	DLLEXPORT FPDF_BOOKMARK STDCALL FPDFBookmark_GetNextSibling(FPDF_DOCUMENT document, FPDF_BOOKMARK pDict)
	{
	if (!document \|\| !pDict)
	return NULL;
	CPDF_Document* pDoc = (CPDF_Document*)document;
	CPDF_BookmarkTree tree(pDoc);
	CPDF_Bookmark bookmark = CPDF_Bookmark((CPDF_Dictionary*)pDict);
	return tree.GetNextSibling(bookmark).GetDict();
	}

	DLLEXPORT unsigned long STDCALL FPDFBookmark_GetTitle(FPDF_BOOKMARK pDict, void* buffer, unsigned long buflen)
	{
	if (!pDict)
	return 0;
	CPDF_Bookmark bookmark((CPDF_Dictionary*)pDict);
	CFX_WideString title = bookmark.GetTitle();
	CFX_ByteString encodedTitle = title.UTF16LE_Encode();
	unsigned long len = encodedTitle.GetLength();
	if (buffer && buflen >= len) {
	FXSYS_memcpy(buffer, encodedTitle.c_str(), len);
	}
	return len;
	}

	DLLEXPORT FPDF_BOOKMARK STDCALL FPDFBookmark_Find(FPDF_DOCUMENT document, FPDF_WIDESTRING title)
	{
	if (!document)
	return NULL;
	if (!title \|\| title[0] == 0)
	return NULL;
	CPDF_Document* pDoc = (CPDF_Document*)document;
	CPDF_BookmarkTree tree(pDoc);
	FX_STRSIZE len = CFX_WideString::WStringLength(title);
	CFX_WideString encodedTitle = CFX_WideString::FromUTF16LE(title, len);
	return FindBookmark(tree, CPDF_Bookmark(), encodedTitle).GetDict();
	}

	DLLEXPORT FPDF_DEST STDCALL FPDFBookmark_GetDest(FPDF_DOCUMENT document, FPDF_BOOKMARK pDict)
	{
	if (!document)
	return NULL;
	if (!pDict)
	return NULL;
	CPDF_Bookmark bookmark((CPDF_Dictionary*)pDict);
	CPDF_Document* pDoc = (CPDF_Document*)document;
	CPDF_Dest dest = bookmark.GetDest(pDoc);
	if (dest)
	return dest.GetObject();
	// If this bookmark is not directly associated with a dest, we try to get action
	CPDF_Action action = bookmark.GetAction();
	if (!action)
	return NULL;
	return action.GetDest(pDoc).GetObject();
	}

	DLLEXPORT FPDF_ACTION STDCALL FPDFBookmark_GetAction(FPDF_BOOKMARK pDict)
	{
	if (!pDict)
	return NULL;
	CPDF_Bookmark bookmark((CPDF_Dictionary*)pDict);
	return bookmark.GetAction().GetDict();
	}

	DLLEXPORT unsigned long STDCALL FPDFAction_GetType(FPDF_ACTION pDict)
	{
	if (!pDict)
	return 0;
	CPDF_Action action((CPDF_Dictionary*)pDict);
	CPDF_Action::ActionType type = action.GetType();
	switch (type) {
	case CPDF_Action::GoTo:
	return PDFACTION_GOTO;
	case CPDF_Action::GoToR:
	return PDFACTION_REMOTEGOTO;
	case CPDF_Action::URI:
	return PDFACTION_URI;
	case CPDF_Action::Launch:
	return PDFACTION_LAUNCH;
	default:
	return PDFACTION_UNSUPPORTED;
	}
	return PDFACTION_UNSUPPORTED;
	}

	DLLEXPORT FPDF_DEST STDCALL FPDFAction_GetDest(FPDF_DOCUMENT document, FPDF_ACTION pDict)
	{
	if (!document)
	return NULL;
	if (!pDict)
	return NULL;
	CPDF_Document* pDoc = (CPDF_Document*)document;
	CPDF_Action action((CPDF_Dictionary*)pDict);
	return action.GetDest(pDoc).GetObject();
	}

	DLLEXPORT unsigned long STDCALL FPDFAction_GetURIPath(FPDF_DOCUMENT document, FPDF_ACTION pDict,
	void* buffer, unsigned long buflen)
	{
	if (!document)
	return 0;
	if (!pDict)
	return 0;
	CPDF_Document* pDoc = (CPDF_Document*)document;
	CPDF_Action action((CPDF_Dictionary*)pDict);
	CFX_ByteString path = action.GetURI(pDoc);
	unsigned long len = path.GetLength() + 1;
	if (buffer != NULL && buflen >= len)
	FXSYS_memcpy(buffer, path.c_str(), len);
	return len;
	}

	DLLEXPORT unsigned long STDCALL FPDFDest_GetPageIndex(FPDF_DOCUMENT document, FPDF_DEST pDict)
	{
	if (!document)
	return 0;
	if (!pDict)
	return 0;
	CPDF_Document* pDoc = (CPDF_Document*)document;
	CPDF_Dest dest((CPDF_Array*)pDict);
	return dest.GetPageIndex(pDoc);
	}

	static void ReleaseLinkList(FX_LPVOID data)
	{
	delete (CPDF_LinkList*)data;
	}

	DLLEXPORT FPDF_LINK STDCALL FPDFLink_GetLinkAtPoint(FPDF_PAGE page, double x, double y)
	{
	if (!page)
	return NULL;
	CPDF_Page* pPage = (CPDF_Page*)page;
	// Link list is stored with the document
	CPDF_Document* pDoc = pPage->m_pDocument;
	CPDF_LinkList* pLinkList = (CPDF_LinkList*)pDoc->GetPrivateData(&THISMODULE);
	if (!pLinkList) {
	pLinkList = FX_NEW CPDF_LinkList(pDoc);
	pDoc->SetPrivateData(&THISMODULE, pLinkList, ReleaseLinkList);
	}
	return pLinkList->GetLinkAtPoint(pPage, (FX_FLOAT)x, (FX_FLOAT)y).GetDict();
	}

	DLLEXPORT FPDF_DEST STDCALL FPDFLink_GetDest(FPDF_DOCUMENT document, FPDF_LINK pDict)
	{
	if (!document)
	return NULL;
	if (!pDict)
	return NULL;
	CPDF_Document* pDoc = (CPDF_Document*)document;
	CPDF_Link link((CPDF_Dictionary*)pDict);
	FPDF_DEST dest = link.GetDest(pDoc).GetObject();
	if (dest)
	return dest;
	// If this link is not directly associated with a dest, we try to get action
	CPDF_Action action = link.GetAction();
	if (!action)
	return NULL;
	return action.GetDest(pDoc).GetObject();
	}

	DLLEXPORT FPDF_ACTION STDCALL FPDFLink_GetAction(FPDF_LINK pDict)
	{
	if (!pDict)
	return NULL;
	CPDF_Link link((CPDF_Dictionary*)pDict);
	return link.GetAction().GetDict();
	}

	DLLEXPORT FPDF_BOOL STDCALL FPDFLink_Enumerate(FPDF_PAGE page, int* startPos, FPDF_LINK* linkAnnot)
	{
	if(!page \|\| !startPos \|\| !linkAnnot)
	return FALSE;
	CPDF_Page* pPage = (CPDF_Page*)page;
	if(!pPage->m_pFormDict)
	return FALSE;
	CPDF_Array* pAnnots = pPage->m_pFormDict->GetArray("Annots");
	if(!pAnnots)
	return FALSE;
	for (int i = *startPos; i < (int)pAnnots->GetCount(); i++) {
	CPDF_Dictionary* pDict = (CPDF_Dictionary*)pAnnots->GetElementValue(i);
	if (!pDict \|\| pDict->GetType() != PDFOBJ_DICTIONARY)
	continue;
	if(pDict->GetString(FX_BSTRC("Subtype")).Equal(FX_BSTRC("Link"))) {
	*startPos = i + 1;
	*linkAnnot = (FPDF_LINK)pDict;
	return TRUE;
	}
	}
	return FALSE;
	}

	DLLEXPORT FPDF_BOOL STDCALL FPDFLink_GetAnnotRect(FPDF_LINK linkAnnot, FS_RECTF* rect)
	{
	if(!linkAnnot \|\| !rect)
	return FALSE;
	CPDF_Dictionary* pAnnotDict = (CPDF_Dictionary*)linkAnnot;
	CPDF_Rect rt = pAnnotDict->GetRect(FX_BSTRC("Rect"));
	rect->left = rt.left;
	rect->bottom = rt.bottom;
	rect->right = rt.right;
	rect->top = rt.top;
	return TRUE;
	}

	DLLEXPORT int STDCALL FPDFLink_CountQuadPoints(FPDF_LINK linkAnnot)
	{
	if(!linkAnnot)
	return 0;
	CPDF_Dictionary* pAnnotDict = (CPDF_Dictionary*)linkAnnot;
	CPDF_Array* pArray = pAnnotDict->GetArray(FX_BSTRC("QuadPoints"));
	if (!pArray)
	return 0;
	else
	return pArray->GetCount() / 8;
	}

	DLLEXPORT FPDF_BOOL STDCALL FPDFLink_GetQuadPoints(FPDF_LINK linkAnnot, int quadIndex, FS_QUADPOINTSF* quadPoints)
	{
	if(!linkAnnot \|\| !quadPoints)
	return FALSE;
	CPDF_Dictionary* pAnnotDict = (CPDF_Dictionary*)linkAnnot;
	CPDF_Array* pArray = pAnnotDict->GetArray(FX_BSTRC("QuadPoints"));
	if (pArray) {
	if (quadIndex < 0 \|\| quadIndex >= (int)pArray->GetCount()/8 \|\| ((quadIndex*8+7) >= (int)pArray->GetCount()))
	return FALSE;
	quadPoints->x1 = pArray->GetNumber(quadIndex*8);
	quadPoints->y1 = pArray->GetNumber(quadIndex*8+1);
	quadPoints->x2 = pArray->GetNumber(quadIndex*8+2);
	quadPoints->y2 = pArray->GetNumber(quadIndex*8+3);
	quadPoints->x3 = pArray->GetNumber(quadIndex*8+4);
	quadPoints->y3 = pArray->GetNumber(quadIndex*8+5);
	quadPoints->x4 = pArray->GetNumber(quadIndex*8+6);
	quadPoints->y4 = pArray->GetNumber(quadIndex*8+7);
	return TRUE;
	}
	return FALSE;
	}

	DLLEXPORT unsigned long STDCALL FPDF_GetMetaText(FPDF_DOCUMENT doc, FPDF_BYTESTRING tag,
	void* buffer, unsigned long buflen)
	{
	if (!doc \|\| !tag)
	return 0;
	CPDF_Document* pDoc = (CPDF_Document*)doc;
	// Get info dictionary
	CPDF_Dictionary* pInfo = pDoc->GetInfo();
	if (!pInfo)
	return 0;
	CFX_WideString text = pInfo->GetUnicodeText(tag);
	// Use UTF-16LE encoding
	CFX_ByteString encodedText = text.UTF16LE_Encode();
	unsigned long len = encodedText.GetLength();
	if (buffer && buflen >= len) {
	FXSYS_memcpy(buffer, encodedText.c_str(), len);
	}
	return len;
	}