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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 <algorithm>
#include "core/fpdfapi/fpdf_page/include/cpdf_page.h"
#include "core/fpdfapi/fpdf_page/include/cpdf_pageobject.h"
#include "core/fpdfapi/fpdf_parser/include/cpdf_array.h"
#include "core/fpdfapi/fpdf_parser/include/cpdf_document.h"
#include "core/fpdfapi/fpdf_parser/include/cpdf_number.h"
#include "core/fpdfapi/fpdf_parser/include/cpdf_stream.h"
#include "core/fpdfapi/fpdf_parser/include/cpdf_stream_acc.h"
#include "fpdfsdk/include/fsdk_define.h"
typedef CFX_ArrayTemplate<CPDF_Dictionary*> CPDF_ObjectArray;
typedef CFX_ArrayTemplate<CFX_FloatRect> CPDF_RectArray;
enum FPDF_TYPE { MAX, MIN };
enum FPDF_VALUE { TOP, LEFT, RIGHT, BOTTOM };
FX_BOOL IsValiableRect(CFX_FloatRect rect, CFX_FloatRect rcPage) {
if (rect.left - rect.right > 0.000001f || rect.bottom - rect.top > 0.000001f)
return FALSE;
if (rect.left == 0.0f && rect.top == 0.0f && rect.right == 0.0f &&
rect.bottom == 0.0f)
return FALSE;
if (!rcPage.IsEmpty()) {
if (rect.left - rcPage.left < -10.000001f ||
rect.right - rcPage.right > 10.000001f ||
rect.top - rcPage.top > 10.000001f ||
rect.bottom - rcPage.bottom < -10.000001f)
return FALSE;
}
return TRUE;
}
void GetContentsRect(CPDF_Document* pDoc,
CPDF_Dictionary* pDict,
CPDF_RectArray* pRectArray) {
std::unique_ptr<CPDF_Page> pPDFPage(new CPDF_Page(pDoc, pDict, false));
pPDFPage->ParseContent();
for (const auto& pPageObject : *pPDFPage->GetPageObjectList()) {
CFX_FloatRect rc;
rc.left = pPageObject->m_Left;
rc.right = pPageObject->m_Right;
rc.bottom = pPageObject->m_Bottom;
rc.top = pPageObject->m_Top;
if (IsValiableRect(rc, pDict->GetRectBy("MediaBox")))
pRectArray->Add(rc);
}
}
void ParserStream(CPDF_Dictionary* pPageDic,
CPDF_Dictionary* pStream,
CPDF_RectArray* pRectArray,
CPDF_ObjectArray* pObjectArray) {
if (!pStream)
return;
CFX_FloatRect rect;
if (pStream->KeyExist("Rect"))
rect = pStream->GetRectBy("Rect");
else if (pStream->KeyExist("BBox"))
rect = pStream->GetRectBy("BBox");
if (IsValiableRect(rect, pPageDic->GetRectBy("MediaBox")))
pRectArray->Add(rect);
pObjectArray->Add(pStream);
}
int ParserAnnots(CPDF_Document* pSourceDoc,
CPDF_Dictionary* pPageDic,
CPDF_RectArray* pRectArray,
CPDF_ObjectArray* pObjectArray,
int nUsage) {
if (!pSourceDoc || !pPageDic)
return FLATTEN_FAIL;
GetContentsRect(pSourceDoc, pPageDic, pRectArray);
CPDF_Array* pAnnots = pPageDic->GetArrayBy("Annots");
if (!pAnnots)
return FLATTEN_NOTHINGTODO;
uint32_t dwSize = pAnnots->GetCount();
for (int i = 0; i < (int)dwSize; i++) {
CPDF_Dictionary* pAnnotDic = ToDictionary(pAnnots->GetDirectObjectAt(i));
if (!pAnnotDic)
continue;
CFX_ByteString sSubtype = pAnnotDic->GetStringBy("Subtype");
if (sSubtype == "Popup")
continue;
int nAnnotFlag = pAnnotDic->GetIntegerBy("F");
if (nAnnotFlag & ANNOTFLAG_HIDDEN)
continue;
if (nUsage == FLAT_NORMALDISPLAY) {
if (nAnnotFlag & ANNOTFLAG_INVISIBLE)
continue;
ParserStream(pPageDic, pAnnotDic, pRectArray, pObjectArray);
} else {
if (nAnnotFlag & ANNOTFLAG_PRINT)
ParserStream(pPageDic, pAnnotDic, pRectArray, pObjectArray);
}
}
return FLATTEN_SUCCESS;
}
FX_FLOAT GetMinMaxValue(CPDF_RectArray& array,
FPDF_TYPE type,
FPDF_VALUE value) {
int nRects = array.GetSize();
FX_FLOAT fRet = 0.0f;
if (nRects <= 0)
return 0.0f;
FX_FLOAT* pArray = new FX_FLOAT[nRects];
switch (value) {
case LEFT: {
for (int i = 0; i < nRects; i++)
pArray[i] = CFX_FloatRect(array.GetAt(i)).left;
break;
}
case TOP: {
for (int i = 0; i < nRects; i++)
pArray[i] = CFX_FloatRect(array.GetAt(i)).top;
break;
}
case RIGHT: {
for (int i = 0; i < nRects; i++)
pArray[i] = CFX_FloatRect(array.GetAt(i)).right;
break;
}
case BOTTOM: {
for (int i = 0; i < nRects; i++)
pArray[i] = CFX_FloatRect(array.GetAt(i)).bottom;
break;
}
default:
// Not reachable.
return 0.0f;
}
fRet = pArray[0];
if (type == MAX) {
for (int i = 1; i < nRects; i++)
if (fRet <= pArray[i])
fRet = pArray[i];
} else {
for (int i = 1; i < nRects; i++)
if (fRet >= pArray[i])
fRet = pArray[i];
}
delete[] pArray;
return fRet;
}
CFX_FloatRect CalculateRect(CPDF_RectArray* 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;
}
void SetPageContents(CFX_ByteString key,
CPDF_Dictionary* pPage,
CPDF_Document* pDocument) {
CPDF_Object* pContentsObj = pPage->GetStreamBy("Contents");
if (!pContentsObj) {
pContentsObj = pPage->GetArrayBy("Contents");
}
if (!pContentsObj) {
// Create a new contents dictionary
if (!key.IsEmpty()) {
CPDF_Stream* pNewContents =
new CPDF_Stream(nullptr, 0, new CPDF_Dictionary);
pPage->SetAtReference("Contents", pDocument,
pDocument->AddIndirectObject(pNewContents));
CFX_ByteString sStream;
sStream.Format("q 1 0 0 1 0 0 cm /%s Do Q", key.c_str());
pNewContents->SetData(sStream.raw_str(), sStream.GetLength(), FALSE,
FALSE);
}
return;
}
CPDF_Array* pContentsArray = nullptr;
switch (pContentsObj->GetType()) {
case CPDF_Object::STREAM: {
pContentsArray = new CPDF_Array;
CPDF_Stream* pContents = pContentsObj->AsStream();
uint32_t dwObjNum = pDocument->AddIndirectObject(pContents);
CPDF_StreamAcc acc;
acc.LoadAllData(pContents);
CFX_ByteString sStream = "q\n";
CFX_ByteString sBody =
CFX_ByteString((const FX_CHAR*)acc.GetData(), acc.GetSize());
sStream = sStream + sBody + "\nQ";
pContents->SetData(sStream.raw_str(), sStream.GetLength(), FALSE, FALSE);
pContentsArray->AddReference(pDocument, dwObjNum);
break;
}
case CPDF_Object::ARRAY: {
pContentsArray = pContentsObj->AsArray();
break;
}
default:
break;
}
if (!pContentsArray)
return;
uint32_t dwObjNum = pDocument->AddIndirectObject(pContentsArray);
pPage->SetAtReference("Contents", pDocument, dwObjNum);
if (!key.IsEmpty()) {
CPDF_Stream* pNewContents =
new CPDF_Stream(nullptr, 0, new CPDF_Dictionary);
dwObjNum = pDocument->AddIndirectObject(pNewContents);
pContentsArray->AddReference(pDocument, dwObjNum);
CFX_ByteString sStream;
sStream.Format("q 1 0 0 1 0 0 cm /%s Do Q", key.c_str());
pNewContents->SetData(sStream.raw_str(), sStream.GetLength(), FALSE, FALSE);
}
}
CFX_Matrix GetMatrix(CFX_FloatRect rcAnnot,
CFX_FloatRect rcStream,
const CFX_Matrix& matrix) {
if (rcStream.IsEmpty())
return CFX_Matrix();
matrix.TransformRect(rcStream);
rcStream.Normalize();
FX_FLOAT a = rcAnnot.Width() / rcStream.Width();
FX_FLOAT d = rcAnnot.Height() / rcStream.Height();
FX_FLOAT e = rcAnnot.left - rcStream.left * a;
FX_FLOAT f = rcAnnot.bottom - rcStream.bottom * d;
return CFX_Matrix(a, 0, 0, d, e, f);
}
void GetOffset(FX_FLOAT& fa,
FX_FLOAT& fd,
FX_FLOAT& fe,
FX_FLOAT& ff,
CFX_FloatRect rcAnnot,
CFX_FloatRect rcStream,
const CFX_Matrix& matrix) {
FX_FLOAT fStreamWidth = 0.0f;
FX_FLOAT fStreamHeight = 0.0f;
if (matrix.a != 0 && matrix.d != 0) {
fStreamWidth = rcStream.right - rcStream.left;
fStreamHeight = rcStream.top - rcStream.bottom;
} else {
fStreamWidth = rcStream.top - rcStream.bottom;
fStreamHeight = rcStream.right - rcStream.left;
}
FX_FLOAT x1 =
matrix.a * rcStream.left + matrix.c * rcStream.bottom + matrix.e;
FX_FLOAT y1 =
matrix.b * rcStream.left + matrix.d * rcStream.bottom + matrix.f;
FX_FLOAT x2 = matrix.a * rcStream.left + matrix.c * rcStream.top + matrix.e;
FX_FLOAT y2 = matrix.b * rcStream.left + matrix.d * rcStream.top + matrix.f;
FX_FLOAT x3 =
matrix.a * rcStream.right + matrix.c * rcStream.bottom + matrix.e;
FX_FLOAT y3 =
matrix.b * rcStream.right + matrix.d * rcStream.bottom + matrix.f;
FX_FLOAT x4 = matrix.a * rcStream.right + matrix.c * rcStream.top + matrix.e;
FX_FLOAT y4 = matrix.b * rcStream.right + matrix.d * rcStream.top + matrix.f;
FX_FLOAT left = std::min(std::min(x1, x2), std::min(x3, x4));
FX_FLOAT bottom = std::min(std::min(y1, y2), std::min(y3, y4));
fa = (rcAnnot.right - rcAnnot.left) / fStreamWidth;
fd = (rcAnnot.top - rcAnnot.bottom) / fStreamHeight;
fe = rcAnnot.left - left * fa;
ff = rcAnnot.bottom - bottom * fd;
}
DLLEXPORT int STDCALL FPDFPage_Flatten(FPDF_PAGE page, int nFlag) {
CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
if (!page) {
return FLATTEN_FAIL;
}
CPDF_Document* pDocument = pPage->m_pDocument;
CPDF_Dictionary* pPageDict = pPage->m_pFormDict;
if (!pDocument || !pPageDict) {
return FLATTEN_FAIL;
}
CPDF_ObjectArray ObjectArray;
CPDF_RectArray RectArray;
int iRet = FLATTEN_FAIL;
iRet = ParserAnnots(pDocument, pPageDict, &RectArray, &ObjectArray, nFlag);
if (iRet == FLATTEN_NOTHINGTODO || iRet == FLATTEN_FAIL)
return iRet;
CFX_FloatRect rcOriginalCB;
CFX_FloatRect rcMerger = CalculateRect(&RectArray);
CFX_FloatRect rcOriginalMB = pPageDict->GetRectBy("MediaBox");
if (pPageDict->KeyExist("CropBox"))
rcOriginalMB = pPageDict->GetRectBy("CropBox");
if (rcOriginalMB.IsEmpty()) {
rcOriginalMB = CFX_FloatRect(0.0f, 0.0f, 612.0f, 792.0f);
}
rcMerger.left =
rcMerger.left < rcOriginalMB.left ? rcOriginalMB.left : rcMerger.left;
rcMerger.right =
rcMerger.right > rcOriginalMB.right ? rcOriginalMB.right : rcMerger.right;
rcMerger.top =
rcMerger.top > rcOriginalMB.top ? rcOriginalMB.top : rcMerger.top;
rcMerger.bottom = rcMerger.bottom < rcOriginalMB.bottom ? rcOriginalMB.bottom
: rcMerger.bottom;
if (pPageDict->KeyExist("ArtBox"))
rcOriginalCB = pPageDict->GetRectBy("ArtBox");
else
rcOriginalCB = rcOriginalMB;
if (!rcOriginalMB.IsEmpty()) {
CPDF_Array* pMediaBox = new CPDF_Array();
pMediaBox->Add(new CPDF_Number(rcOriginalMB.left));
pMediaBox->Add(new CPDF_Number(rcOriginalMB.bottom));
pMediaBox->Add(new CPDF_Number(rcOriginalMB.right));
pMediaBox->Add(new CPDF_Number(rcOriginalMB.top));
pPageDict->SetAt("MediaBox", pMediaBox);
}
if (!rcOriginalCB.IsEmpty()) {
CPDF_Array* pCropBox = new CPDF_Array();
pCropBox->Add(new CPDF_Number(rcOriginalCB.left));
pCropBox->Add(new CPDF_Number(rcOriginalCB.bottom));
pCropBox->Add(new CPDF_Number(rcOriginalCB.right));
pCropBox->Add(new CPDF_Number(rcOriginalCB.top));
pPageDict->SetAt("ArtBox", pCropBox);
}
CPDF_Dictionary* pRes = pPageDict->GetDictBy("Resources");
if (!pRes) {
pRes = new CPDF_Dictionary;
pPageDict->SetAt("Resources", pRes);
}
CPDF_Stream* pNewXObject = new CPDF_Stream(nullptr, 0, new CPDF_Dictionary);
uint32_t dwObjNum = pDocument->AddIndirectObject(pNewXObject);
CPDF_Dictionary* pPageXObject = pRes->GetDictBy("XObject");
if (!pPageXObject) {
pPageXObject = new CPDF_Dictionary;
pRes->SetAt("XObject", pPageXObject);
}
CFX_ByteString key = "";
int nStreams = ObjectArray.GetSize();
if (nStreams > 0) {
for (int iKey = 0; /*iKey < 100*/; iKey++) {
char sExtend[5] = {};
FXSYS_itoa(iKey, sExtend, 10);
key = CFX_ByteString("FFT") + CFX_ByteString(sExtend);
if (!pPageXObject->KeyExist(key))
break;
}
}
SetPageContents(key, pPageDict, pDocument);
CPDF_Dictionary* pNewXORes = nullptr;
if (!key.IsEmpty()) {
pPageXObject->SetAtReference(key, pDocument, dwObjNum);
CPDF_Dictionary* pNewOXbjectDic = pNewXObject->GetDict();
pNewXORes = new CPDF_Dictionary;
pNewOXbjectDic->SetAt("Resources", pNewXORes);
pNewOXbjectDic->SetAtName("Type", "XObject");
pNewOXbjectDic->SetAtName("Subtype", "Form");
pNewOXbjectDic->SetAtInteger("FormType", 1);
pNewOXbjectDic->SetAtName("Name", "FRM");
CFX_FloatRect rcBBox = pPageDict->GetRectBy("ArtBox");
pNewOXbjectDic->SetAtRect("BBox", rcBBox);
}
for (int i = 0; i < nStreams; i++) {
CPDF_Dictionary* pAnnotDic = ObjectArray.GetAt(i);
if (!pAnnotDic)
continue;
CFX_FloatRect rcAnnot = pAnnotDic->GetRectBy("Rect");
rcAnnot.Normalize();
CFX_ByteString sAnnotState = pAnnotDic->GetStringBy("AS");
CPDF_Dictionary* pAnnotAP = pAnnotDic->GetDictBy("AP");
if (!pAnnotAP)
continue;
CPDF_Stream* pAPStream = pAnnotAP->GetStreamBy("N");
if (!pAPStream) {
CPDF_Dictionary* pAPDic = pAnnotAP->GetDictBy("N");
if (!pAPDic)
continue;
if (!sAnnotState.IsEmpty()) {
pAPStream = pAPDic->GetStreamBy(sAnnotState);
} else {
auto it = pAPDic->begin();
if (it != pAPDic->end()) {
CPDF_Object* pFirstObj = it->second;
if (pFirstObj) {
if (pFirstObj->IsReference())
pFirstObj = pFirstObj->GetDirect();
if (!pFirstObj->IsStream())
continue;
pAPStream = pFirstObj->AsStream();
}
}
}
}
if (!pAPStream)
continue;
CPDF_Dictionary* pAPDic = pAPStream->GetDict();
CFX_Matrix matrix = pAPDic->GetMatrixBy("Matrix");
CFX_FloatRect rcStream;
if (pAPDic->KeyExist("Rect"))
rcStream = pAPDic->GetRectBy("Rect");
else if (pAPDic->KeyExist("BBox"))
rcStream = pAPDic->GetRectBy("BBox");
if (rcStream.IsEmpty())
continue;
CPDF_Object* pObj = pAPStream;
if (pObj) {
CPDF_Dictionary* pObjDic = pObj->GetDict();
if (pObjDic) {
pObjDic->SetAtName("Type", "XObject");
pObjDic->SetAtName("Subtype", "Form");
}
}
CPDF_Dictionary* pXObject = pNewXORes->GetDictBy("XObject");
if (!pXObject) {
pXObject = new CPDF_Dictionary;
pNewXORes->SetAt("XObject", pXObject);
}
CFX_ByteString sFormName;
sFormName.Format("F%d", i);
uint32_t dwStreamObjNum = pDocument->AddIndirectObject(pObj);
pXObject->SetAtReference(sFormName, pDocument, dwStreamObjNum);
CPDF_StreamAcc acc;
acc.LoadAllData(pNewXObject);
const uint8_t* pData = acc.GetData();
CFX_ByteString sStream(pData, acc.GetSize());
CFX_ByteString sTemp;
if (matrix.IsIdentity()) {
matrix.a = 1.0f;
matrix.b = 0.0f;
matrix.c = 0.0f;
matrix.d = 1.0f;
matrix.e = 0.0f;
matrix.f = 0.0f;
}
CFX_Matrix m = GetMatrix(rcAnnot, rcStream, matrix);
sTemp.Format("q %f 0 0 %f %f %f cm /%s Do Q\n", m.a, m.d, m.e, m.f,
sFormName.c_str());
sStream += sTemp;
pNewXObject->SetData(sStream.raw_str(), sStream.GetLength(), FALSE, FALSE);
}
pPageDict->RemoveAt("Annots");
ObjectArray.RemoveAll();
RectArray.RemoveAll();
return FLATTEN_SUCCESS;
}