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// 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/fpdf_tagged.h"
#include "fpdfsdk/fsdk_define.h"
namespace {
IPDF_StructTree* ToStructTree(FPDF_STRUCTTREE struct_tree) {
return reinterpret_cast<IPDF_StructTree*>(struct_tree);
}
IPDF_StructElement* ToStructTreeElement(FPDF_STRUCTELEMENT struct_element) {
return reinterpret_cast<IPDF_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 IPDF_StructTree::LoadPage(pPage->m_pDocument, pPage->m_pFormDict)
.release();
}
DLLEXPORT void STDCALL FPDF_StructTree_Close(FPDF_STRUCTTREE struct_tree) {
std::unique_ptr<IPDF_StructTree>(ToStructTree(struct_tree));
}
DLLEXPORT int STDCALL
FPDF_StructTree_CountChildren(FPDF_STRUCTTREE struct_tree) {
IPDF_StructTree* tree = ToStructTree(struct_tree);
return tree ? tree->CountTopElements() : -1;
}
DLLEXPORT FPDF_STRUCTELEMENT STDCALL
FPDF_StructTree_GetChildAtIndex(FPDF_STRUCTTREE struct_tree, int index) {
IPDF_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) {
IPDF_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) {
IPDF_StructElement* elem = ToStructTreeElement(struct_element);
return elem ? WideStringToBuffer(elem->GetType().UTF8Decode(), buffer, buflen)
: 0;
}
DLLEXPORT int STDCALL
FPDF_StructElement_CountChildren(FPDF_STRUCTELEMENT struct_element) {
IPDF_StructElement* elem = ToStructTreeElement(struct_element);
return elem ? elem->CountKids() : -1;
}
DLLEXPORT FPDF_STRUCTELEMENT STDCALL
FPDF_StructElement_GetChildAtIndex(FPDF_STRUCTELEMENT struct_element,
int index) {
IPDF_StructElement* elem = ToStructTreeElement(struct_element);
if (!elem || index < 0 || index >= elem->CountKids())
return nullptr;
return elem->GetKidIfElement(index);
}
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