// Copyright 2016 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. #include "public/fpdf_structtree.h" #include <memory> #include "core/fpdfapi/page/cpdf_page.h" #include "core/fpdfapi/parser/cpdf_dictionary.h" #include "core/fpdfdoc/cpdf_structelement.h" #include "core/fpdfdoc/cpdf_structtree.h" #include "fpdfsdk/fsdk_define.h" namespace { CPDF_StructTree* ToStructTree(FPDF_STRUCTTREE struct_tree) { return static_cast<CPDF_StructTree*>(struct_tree); } CPDF_StructElement* ToStructTreeElement(FPDF_STRUCTELEMENT struct_element) { return static_cast<CPDF_StructElement*>(struct_element); } unsigned long WideStringToBuffer(const CFX_WideString& str, void* buffer, unsigned long buflen) { if (str.IsEmpty()) return 0; CFX_ByteString encodedStr = str.UTF16LE_Encode(); const unsigned long len = encodedStr.GetLength(); if (buffer && len <= buflen) memcpy(buffer, encodedStr.c_str(), len); return len; } } // namespace DLLEXPORT FPDF_STRUCTTREE STDCALL FPDF_StructTree_GetForPage(FPDF_PAGE page) { CPDF_Page* pPage = CPDFPageFromFPDFPage(page); if (!pPage) return nullptr; return CPDF_StructTree::LoadPage(pPage->m_pDocument.Get(), pPage->m_pFormDict.Get()) .release(); } DLLEXPORT void STDCALL FPDF_StructTree_Close(FPDF_STRUCTTREE struct_tree) { std::unique_ptr<CPDF_StructTree>(ToStructTree(struct_tree)); } DLLEXPORT int STDCALL FPDF_StructTree_CountChildren(FPDF_STRUCTTREE struct_tree) { CPDF_StructTree* tree = ToStructTree(struct_tree); return tree ? tree->CountTopElements() : -1; } DLLEXPORT FPDF_STRUCTELEMENT STDCALL FPDF_StructTree_GetChildAtIndex(FPDF_STRUCTTREE struct_tree, int index) { CPDF_StructTree* tree = ToStructTree(struct_tree); if (!tree || index < 0 || index >= tree->CountTopElements()) return nullptr; return tree->GetTopElement(index); } DLLEXPORT unsigned long STDCALL FPDF_StructElement_GetAltText(FPDF_STRUCTELEMENT struct_element, void* buffer, unsigned long buflen) { CPDF_StructElement* elem = ToStructTreeElement(struct_element); return (elem && elem->GetDict()) ? WideStringToBuffer(elem->GetDict()->GetUnicodeTextFor("Alt"), buffer, buflen) : 0; } DLLEXPORT unsigned long STDCALL FPDF_StructElement_GetType(FPDF_STRUCTELEMENT struct_element, void* buffer, unsigned long buflen) { CPDF_StructElement* elem = ToStructTreeElement(struct_element); return elem ? WideStringToBuffer(elem->GetType().UTF8Decode(), buffer, buflen) : 0; } DLLEXPORT unsigned long STDCALL FPDF_StructElement_GetTitle(FPDF_STRUCTELEMENT struct_element, void* buffer, unsigned long buflen) { CPDF_StructElement* elem = ToStructTreeElement(struct_element); return elem ? WideStringToBuffer(elem->GetTitle().UTF8Decode(), buffer, buflen) : 0; } DLLEXPORT int STDCALL FPDF_StructElement_CountChildren(FPDF_STRUCTELEMENT struct_element) { CPDF_StructElement* elem = ToStructTreeElement(struct_element); return elem ? elem->CountKids() : -1; } DLLEXPORT FPDF_STRUCTELEMENT STDCALL FPDF_StructElement_GetChildAtIndex(FPDF_STRUCTELEMENT struct_element, int index) { CPDF_StructElement* elem = ToStructTreeElement(struct_element); if (!elem || index < 0 || index >= elem->CountKids()) return nullptr; return elem->GetKidIfElement(index); }