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// 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 "public/fpdf_flatten.h"
#include <limits.h>
#include <algorithm>
#include <sstream>
#include <utility>
#include <vector>
#include "constants/annotation_common.h"
#include "constants/annotation_flags.h"
#include "constants/page_object.h"
#include "core/fpdfapi/edit/cpdf_contentstream_write_utils.h"
#include "core/fpdfapi/page/cpdf_page.h"
#include "core/fpdfapi/page/cpdf_pageobject.h"
#include "core/fpdfapi/parser/cpdf_array.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/parser/cpdf_document.h"
#include "core/fpdfapi/parser/cpdf_name.h"
#include "core/fpdfapi/parser/cpdf_number.h"
#include "core/fpdfapi/parser/cpdf_reference.h"
#include "core/fpdfapi/parser/cpdf_stream.h"
#include "core/fpdfapi/parser/cpdf_stream_acc.h"
#include "core/fpdfapi/parser/fpdf_parser_utility.h"
#include "core/fpdfdoc/cpdf_annot.h"
#include "core/fxcrt/fx_string_wrappers.h"
#include "fpdfsdk/cpdfsdk_helpers.h"
#include "third_party/base/notreached.h"
enum FPDF_TYPE { MAX, MIN };
enum FPDF_VALUE { TOP, LEFT, RIGHT, BOTTOM };
namespace {
bool IsValidRect(const CFX_FloatRect& rect, const CFX_FloatRect& rcPage) {
constexpr float kMinSize = 0.000001f;
if (rect.IsEmpty() || rect.Width() < kMinSize || rect.Height() < kMinSize)
return false;
if (rcPage.IsEmpty())
return true;
constexpr float kMinBorderSize = 10.000001f;
return rect.left - rcPage.left >= -kMinBorderSize &&
rect.right - rcPage.right <= kMinBorderSize &&
rect.top - rcPage.top <= kMinBorderSize &&
rect.bottom - rcPage.bottom >= -kMinBorderSize;
}
void GetContentsRect(CPDF_Document* pDoc,
CPDF_Dictionary* pDict,
std::vector<CFX_FloatRect>* pRectArray) {
auto pPDFPage = pdfium::MakeRetain<CPDF_Page>(pDoc, pDict);
pPDFPage->ParseContent();
for (const auto& pPageObject : *pPDFPage) {
const CFX_FloatRect& rc = pPageObject->GetRect();
if (IsValidRect(rc, pDict->GetRectFor(pdfium::page_object::kMediaBox)))
pRectArray->push_back(rc);
}
}
void ParserStream(CPDF_Dictionary* pPageDic,
CPDF_Dictionary* pStream,
std::vector<CFX_FloatRect>* pRectArray,
std::vector<CPDF_Dictionary*>* pObjectArray) {
if (!pStream)
return;
CFX_FloatRect rect;
if (pStream->KeyExist("Rect"))
rect = pStream->GetRectFor("Rect");
else if (pStream->KeyExist("BBox"))
rect = pStream->GetRectFor("BBox");
if (IsValidRect(rect, pPageDic->GetRectFor(pdfium::page_object::kMediaBox)))
pRectArray->push_back(rect);
pObjectArray->push_back(pStream);
}
int ParserAnnots(CPDF_Document* pSourceDoc,
CPDF_Dictionary* pPageDic,
std::vector<CFX_FloatRect>* pRectArray,
std::vector<CPDF_Dictionary*>* pObjectArray,
int nUsage) {
if (!pSourceDoc)
return FLATTEN_FAIL;
GetContentsRect(pSourceDoc, pPageDic, pRectArray);
CPDF_Array* pAnnots = pPageDic->GetArrayFor("Annots");
if (!pAnnots)
return FLATTEN_NOTHINGTODO;
CPDF_ArrayLocker locker(pAnnots);
for (const auto& pAnnot : locker) {
CPDF_Dictionary* pAnnotDict = ToDictionary(pAnnot->GetDirect());
if (!pAnnotDict)
continue;
ByteString sSubtype =
pAnnotDict->GetStringFor(pdfium::annotation::kSubtype);
if (sSubtype == "Popup")
continue;
int nAnnotFlag = pAnnotDict->GetIntegerFor("F");
if (nAnnotFlag & pdfium::annotation_flags::kHidden)
continue;
bool bParseStream;
if (nUsage == FLAT_NORMALDISPLAY)
bParseStream = !(nAnnotFlag & pdfium::annotation_flags::kInvisible);
else
bParseStream = !!(nAnnotFlag & pdfium::annotation_flags::kPrint);
if (bParseStream)
ParserStream(pPageDic, pAnnotDict, pRectArray, pObjectArray);
}
return FLATTEN_SUCCESS;
}
float GetMinMaxValue(const std::vector<CFX_FloatRect>& array,
FPDF_TYPE type,
FPDF_VALUE value) {
if (array.empty())
return 0.0f;
size_t nRects = array.size();
std::vector<float> pArray(nRects);
switch (value) {
case LEFT:
for (size_t i = 0; i < nRects; i++)
pArray[i] = array[i].left;
break;
case TOP:
for (size_t i = 0; i < nRects; i++)
pArray[i] = array[i].top;
break;
case RIGHT:
for (size_t i = 0; i < nRects; i++)
pArray[i] = array[i].right;
break;
case BOTTOM:
for (size_t i = 0; i < nRects; i++)
pArray[i] = array[i].bottom;
break;
default:
NOTREACHED();
return 0.0f;
}
float fRet = pArray[0];
if (type == MAX) {
for (size_t i = 1; i < nRects; i++)
fRet = std::max(fRet, pArray[i]);
} else {
for (size_t i = 1; i < nRects; i++)
fRet = std::min(fRet, pArray[i]);
}
return fRet;
}
CFX_FloatRect CalculateRect(std::vector<CFX_FloatRect>* pRectArray) {
CFX_FloatRect rcRet;
rcRet.left = GetMinMaxValue(*pRectArray, MIN, LEFT);
rcRet.top = GetMinMaxValue(*pRectArray, MAX, TOP);
rcRet.right = GetMinMaxValue(*pRectArray, MAX, RIGHT);
rcRet.bottom = GetMinMaxValue(*pRectArray, MIN, BOTTOM);
return rcRet;
}
ByteString GenerateFlattenedContent(const ByteString& key) {
return "q 1 0 0 1 0 0 cm /" + key + " Do Q";
}
CPDF_Object* NewIndirectContentsStream(CPDF_Document* pDocument,
const ByteString& contents) {
CPDF_Stream* pNewContents = pDocument->NewIndirect<CPDF_Stream>(
nullptr, 0, pDocument->New<CPDF_Dictionary>());
pNewContents->SetData(contents.raw_span());
return pNewContents;
}
void SetPageContents(const ByteString& key,
CPDF_Dictionary* pPage,
CPDF_Document* pDocument) {
CPDF_Array* pContentsArray =
pPage->GetArrayFor(pdfium::page_object::kContents);
CPDF_Stream* pContentsStream =
pPage->GetStreamFor(pdfium::page_object::kContents);
if (!pContentsStream && !pContentsArray) {
if (!key.IsEmpty()) {
pPage->SetFor(
pdfium::page_object::kContents,
NewIndirectContentsStream(pDocument, GenerateFlattenedContent(key))
->MakeReference(pDocument));
}
return;
}
pPage->ConvertToIndirectObjectFor(pdfium::page_object::kContents, pDocument);
if (pContentsArray) {
pContentsArray->InsertAt(
0, NewIndirectContentsStream(pDocument, "q")->MakeReference(pDocument));
pContentsArray->Append(
NewIndirectContentsStream(pDocument, "Q")->MakeReference(pDocument));
} else {
ByteString sStream = "q\n";
{
auto pAcc = pdfium::MakeRetain<CPDF_StreamAcc>(pContentsStream);
pAcc->LoadAllDataFiltered();
sStream += ByteString(pAcc->GetSpan());
sStream += "\nQ";
}
pContentsStream->SetDataAndRemoveFilter(sStream.raw_span());
pContentsArray = pDocument->NewIndirect<CPDF_Array>();
pContentsArray->AppendNew<CPDF_Reference>(pDocument,
pContentsStream->GetObjNum());
pPage->SetNewFor<CPDF_Reference>(pdfium::page_object::kContents, pDocument,
pContentsArray->GetObjNum());
}
if (!key.IsEmpty()) {
pContentsArray->Append(
NewIndirectContentsStream(pDocument, GenerateFlattenedContent(key))
->MakeReference(pDocument));
}
}
CFX_Matrix GetMatrix(const CFX_FloatRect& rcAnnot,
const CFX_FloatRect& rcStream,
const CFX_Matrix& matrix) {
if (rcStream.IsEmpty())
return CFX_Matrix();
CFX_FloatRect rcTransformed = matrix.TransformRect(rcStream);
rcTransformed.Normalize();
float a = rcAnnot.Width() / rcTransformed.Width();
float d = rcAnnot.Height() / rcTransformed.Height();
float e = rcAnnot.left - rcTransformed.left * a;
float f = rcAnnot.bottom - rcTransformed.bottom * d;
return CFX_Matrix(a, 0.0f, 0.0f, d, e, f);
}
} // namespace
FPDF_EXPORT int FPDF_CALLCONV FPDFPage_Flatten(FPDF_PAGE page, int nFlag) {
CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
if (!page)
return FLATTEN_FAIL;
CPDF_Document* pDocument = pPage->GetDocument();
CPDF_Dictionary* pPageDict = pPage->GetDict();
if (!pDocument)
return FLATTEN_FAIL;
std::vector<CPDF_Dictionary*> ObjectArray;
std::vector<CFX_FloatRect> RectArray;
int iRet =
ParserAnnots(pDocument, pPageDict, &RectArray, &ObjectArray, nFlag);
if (iRet == FLATTEN_NOTHINGTODO || iRet == FLATTEN_FAIL)
return iRet;
CFX_FloatRect rcMerger = CalculateRect(&RectArray);
CFX_FloatRect rcOriginalMB =
pPageDict->GetRectFor(pdfium::page_object::kMediaBox);
if (pPageDict->KeyExist(pdfium::page_object::kCropBox))
rcOriginalMB = pPageDict->GetRectFor(pdfium::page_object::kCropBox);
rcOriginalMB.Normalize();
if (rcOriginalMB.IsEmpty())
rcOriginalMB = CFX_FloatRect(0.0f, 0.0f, 612.0f, 792.0f);
CFX_FloatRect rcOriginalCB;
if (pPageDict->KeyExist(pdfium::page_object::kCropBox)) {
rcOriginalCB = pPageDict->GetRectFor(pdfium::page_object::kCropBox);
rcOriginalCB.Normalize();
}
if (rcOriginalCB.IsEmpty())
rcOriginalCB = rcOriginalMB;
rcMerger.left = std::max(rcMerger.left, rcOriginalMB.left);
rcMerger.right = std::min(rcMerger.right, rcOriginalMB.right);
rcMerger.bottom = std::max(rcMerger.bottom, rcOriginalMB.bottom);
rcMerger.top = std::min(rcMerger.top, rcOriginalMB.top);
pPageDict->SetRectFor(pdfium::page_object::kMediaBox, rcOriginalMB);
pPageDict->SetRectFor(pdfium::page_object::kCropBox, rcOriginalCB);
CPDF_Dictionary* pRes =
GetOrCreateDict(pPageDict, pdfium::page_object::kResources);
CPDF_Stream* pNewXObject = pDocument->NewIndirect<CPDF_Stream>(
nullptr, 0, pDocument->New<CPDF_Dictionary>());
CPDF_Dictionary* pPageXObject = GetOrCreateDict(pRes, "XObject");
ByteString key;
if (!ObjectArray.empty()) {
int i = 0;
while (i < INT_MAX) {
ByteString sKey = ByteString::Format("FFT%d", i);
if (!pPageXObject->KeyExist(sKey)) {
key = std::move(sKey);
break;
}
++i;
}
}
SetPageContents(key, pPageDict, pDocument);
CPDF_Dictionary* pNewXORes = nullptr;
if (!key.IsEmpty()) {
pPageXObject->SetNewFor<CPDF_Reference>(key, pDocument,
pNewXObject->GetObjNum());
CPDF_Dictionary* pNewOXbjectDic = pNewXObject->GetDict();
pNewXORes = pNewOXbjectDic->SetNewFor<CPDF_Dictionary>("Resources");
pNewOXbjectDic->SetNewFor<CPDF_Name>("Type", "XObject");
pNewOXbjectDic->SetNewFor<CPDF_Name>("Subtype", "Form");
pNewOXbjectDic->SetNewFor<CPDF_Number>("FormType", 1);
pNewOXbjectDic->SetRectFor("BBox", rcOriginalCB);
}
for (size_t i = 0; i < ObjectArray.size(); ++i) {
CPDF_Dictionary* pAnnotDict = ObjectArray[i];
if (!pAnnotDict)
continue;
CFX_FloatRect rcAnnot = pAnnotDict->GetRectFor(pdfium::annotation::kRect);
rcAnnot.Normalize();
ByteString sAnnotState = pAnnotDict->GetStringFor("AS");
CPDF_Dictionary* pAnnotAP = pAnnotDict->GetDictFor(pdfium::annotation::kAP);
if (!pAnnotAP)
continue;
CPDF_Stream* pAPStream = pAnnotAP->GetStreamFor("N");
if (!pAPStream) {
CPDF_Dictionary* pAPDict = pAnnotAP->GetDictFor("N");
if (!pAPDict)
continue;
if (!sAnnotState.IsEmpty()) {
pAPStream = pAPDict->GetStreamFor(sAnnotState);
} else {
if (pAPDict->size() > 0) {
CPDF_DictionaryLocker locker(pAPDict);
CPDF_Object* pFirstObj = locker.begin()->second.Get();
if (pFirstObj) {
if (pFirstObj->IsReference())
pFirstObj = pFirstObj->GetDirect();
if (!pFirstObj->IsStream())
continue;
pAPStream = pFirstObj->AsStream();
}
}
}
}
if (!pAPStream)
continue;
CPDF_Dictionary* pAPDict = pAPStream->GetDict();
CFX_FloatRect rcStream;
if (pAPDict->KeyExist("Rect"))
rcStream = pAPDict->GetRectFor("Rect");
else if (pAPDict->KeyExist("BBox"))
rcStream = pAPDict->GetRectFor("BBox");
rcStream.Normalize();
if (rcStream.IsEmpty())
continue;
CPDF_Object* pObj = pAPStream;
if (pObj->IsInline()) {
RetainPtr<CPDF_Object> pNew = pObj->Clone();
pObj = pNew.Get();
pDocument->AddIndirectObject(std::move(pNew));
}
CPDF_Dictionary* pObjDict = pObj->GetDict();
if (pObjDict) {
pObjDict->SetNewFor<CPDF_Name>("Type", "XObject");
pObjDict->SetNewFor<CPDF_Name>("Subtype", "Form");
}
CPDF_Dictionary* pXObject = GetOrCreateDict(pNewXORes, "XObject");
ByteString sFormName = ByteString::Format("F%d", i);
pXObject->SetNewFor<CPDF_Reference>(sFormName, pDocument,
pObj->GetObjNum());
ByteString sStream;
{
auto pAcc = pdfium::MakeRetain<CPDF_StreamAcc>(pNewXObject);
pAcc->LoadAllDataFiltered();
sStream = ByteString(pAcc->GetSpan());
}
CFX_Matrix matrix = pAPDict->GetMatrixFor("Matrix");
CFX_Matrix m = GetMatrix(rcAnnot, rcStream, matrix);
m.b = 0;
m.c = 0;
fxcrt::ostringstream buf;
buf << m;
ByteString str(buf);
sStream += ByteString::Format("q %s cm /%s Do Q\n", str.c_str(),
sFormName.c_str());
pNewXObject->SetDataAndRemoveFilter(sStream.raw_span());
}
pPageDict->RemoveFor("Annots");
return FLATTEN_SUCCESS;
}