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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/cpdf_structelement.h"
#include "core/fpdfdoc/cpdf_structtree.h"
#include "fpdfsdk/cpdfsdk_helpers.h"
namespace {
unsigned long WideStringToBuffer(const WideString& str,
void* buffer,
unsigned long buflen) {
if (str.IsEmpty())
return 0;
ByteString encodedStr = str.UTF16LE_Encode();
const unsigned long len = encodedStr.GetLength();
if (buffer && len <= buflen)
memcpy(buffer, encodedStr.c_str(), len);
return len;
}
} // namespace
FPDF_EXPORT FPDF_STRUCTTREE FPDF_CALLCONV
FPDF_StructTree_GetForPage(FPDF_PAGE page) {
CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
if (!pPage)
return nullptr;
// Caller takes onwership.
return FPDFStructTreeFromCPDFStructTree(
CPDF_StructTree::LoadPage(pPage->GetDocument(), pPage->GetDict())
.release());
}
FPDF_EXPORT void FPDF_CALLCONV
FPDF_StructTree_Close(FPDF_STRUCTTREE struct_tree) {
std::unique_ptr<CPDF_StructTree>(
CPDFStructTreeFromFPDFStructTree(struct_tree));
}
FPDF_EXPORT int FPDF_CALLCONV
FPDF_StructTree_CountChildren(FPDF_STRUCTTREE struct_tree) {
CPDF_StructTree* tree = CPDFStructTreeFromFPDFStructTree(struct_tree);
if (!tree)
return -1;
pdfium::base::CheckedNumeric<int> tmp_size = tree->CountTopElements();
return tmp_size.ValueOrDefault(-1);
}
FPDF_EXPORT FPDF_STRUCTELEMENT FPDF_CALLCONV
FPDF_StructTree_GetChildAtIndex(FPDF_STRUCTTREE struct_tree, int index) {
CPDF_StructTree* tree = CPDFStructTreeFromFPDFStructTree(struct_tree);
if (!tree || index < 0 ||
static_cast<size_t>(index) >= tree->CountTopElements()) {
return nullptr;
}
return FPDFStructElementFromCPDFStructElement(
tree->GetTopElement(static_cast<size_t>(index)));
}
FPDF_EXPORT unsigned long FPDF_CALLCONV
FPDF_StructElement_GetAltText(FPDF_STRUCTELEMENT struct_element,
void* buffer,
unsigned long buflen) {
CPDF_StructElement* elem =
CPDFStructElementFromFPDFStructElement(struct_element);
return (elem && elem->GetDict())
? WideStringToBuffer(elem->GetDict()->GetUnicodeTextFor("Alt"),
buffer, buflen)
: 0;
}
FPDF_EXPORT int FPDF_CALLCONV
FPDF_StructElement_GetMarkedContentID(FPDF_STRUCTELEMENT struct_element) {
CPDF_StructElement* elem =
CPDFStructElementFromFPDFStructElement(struct_element);
const CPDF_Object* p =
(elem && elem->GetDict()) ? elem->GetDict()->GetObjectFor("K") : nullptr;
return p && p->IsNumber() ? p->GetInteger() : -1;
}
FPDF_EXPORT unsigned long FPDF_CALLCONV
FPDF_StructElement_GetType(FPDF_STRUCTELEMENT struct_element,
void* buffer,
unsigned long buflen) {
CPDF_StructElement* elem =
CPDFStructElementFromFPDFStructElement(struct_element);
return elem ? WideStringToBuffer(elem->GetType().UTF8Decode(), buffer, buflen)
: 0;
}
FPDF_EXPORT unsigned long FPDF_CALLCONV
FPDF_StructElement_GetTitle(FPDF_STRUCTELEMENT struct_element,
void* buffer,
unsigned long buflen) {
CPDF_StructElement* elem =
CPDFStructElementFromFPDFStructElement(struct_element);
return elem
? WideStringToBuffer(elem->GetTitle().UTF8Decode(), buffer, buflen)
: 0;
}
FPDF_EXPORT int FPDF_CALLCONV
FPDF_StructElement_CountChildren(FPDF_STRUCTELEMENT struct_element) {
CPDF_StructElement* elem =
CPDFStructElementFromFPDFStructElement(struct_element);
if (!elem)
return -1;
pdfium::base::CheckedNumeric<int> tmp_size = elem->CountKids();
return tmp_size.ValueOrDefault(-1);
}
FPDF_EXPORT FPDF_STRUCTELEMENT FPDF_CALLCONV
FPDF_StructElement_GetChildAtIndex(FPDF_STRUCTELEMENT struct_element,
int index) {
CPDF_StructElement* elem =
CPDFStructElementFromFPDFStructElement(struct_element);
if (!elem || index < 0 || static_cast<size_t>(index) >= elem->CountKids())
return nullptr;
return FPDFStructElementFromCPDFStructElement(
elem->GetKidIfElement(static_cast<size_t>(index)));
}
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