core/src/fpdfapi/fpdf_page/fpdf_page_doc.cpp

// 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 "../../../include/fpdfapi/fpdf_page.h"
#include "../../../include/fpdfapi/fpdf_module.h"
#include "../../../include/fdrm/fx_crypt.h"
#include "../fpdf_font/font_int.h"
#include "pageint.h"
class CPDF_PageModule : public CPDF_PageModuleDef
{
public:
    CPDF_PageModule() : m_StockGrayCS(PDFCS_DEVICEGRAY), m_StockRGBCS(PDFCS_DEVICERGB),
        m_StockCMYKCS(PDFCS_DEVICECMYK) {}
    virtual ~CPDF_PageModule() {}
    virtual FX_BOOL		Installed()
    {
        return TRUE;
    }
    virtual CPDF_DocPageData*	CreateDocData(CPDF_Document* pDoc)
    {
        return FX_NEW CPDF_DocPageData(pDoc);
    }
    virtual void		ReleaseDoc(CPDF_Document* pDoc);
    virtual void		ClearDoc(CPDF_Document* pDoc);
    virtual CPDF_FontGlobals*	GetFontGlobals()
    {
        return &m_FontGlobals;
    }
    virtual void				ClearStockFont(CPDF_Document* pDoc)
    {
        m_FontGlobals.Clear(pDoc);
    }
    virtual CPDF_ColorSpace*	GetStockCS(int family);
    virtual void		NotifyCJKAvailable();
    CPDF_FontGlobals	m_FontGlobals;
    CPDF_DeviceCS		m_StockGrayCS;
    CPDF_DeviceCS		m_StockRGBCS;
    CPDF_DeviceCS		m_StockCMYKCS;
    CPDF_PatternCS		m_StockPatternCS;
};
CPDF_ColorSpace* CPDF_PageModule::GetStockCS(int family)
{
    if (family == PDFCS_DEVICEGRAY) {
        return &m_StockGrayCS;
    }
    if (family == PDFCS_DEVICERGB) {
        return &m_StockRGBCS;
    }
    if (family == PDFCS_DEVICECMYK) {
        return &m_StockCMYKCS;
    }
    if (family == PDFCS_PATTERN) {
        return &m_StockPatternCS;
    }
    return NULL;
}
void CPDF_ModuleMgr::InitPageModule()
{
    if (m_pPageModule) {
        delete m_pPageModule;
    }
    CPDF_PageModule* pPageModule = FX_NEW CPDF_PageModule;
    m_pPageModule = pPageModule;
}
void CPDF_PageModule::ReleaseDoc(CPDF_Document* pDoc)
{
    delete pDoc->GetPageData();
}
void CPDF_PageModule::ClearDoc(CPDF_Document* pDoc)
{
    pDoc->GetPageData()->Clear(FALSE);
}
void CPDF_PageModule::NotifyCJKAvailable()
{
    m_FontGlobals.m_CMapManager.ReloadAll();
}
CPDF_Font* CPDF_Document::LoadFont(CPDF_Dictionary* pFontDict)
{
    if (!pFontDict) {
        return NULL;
    }
    return GetValidatePageData()->GetFont(pFontDict, FALSE);
}
CPDF_Font* CPDF_Document::FindFont(CPDF_Dictionary* pFontDict)
{
    if (!pFontDict) {
        return NULL;
    }
    return GetValidatePageData()->GetFont(pFontDict, TRUE);
}
CPDF_StreamAcc* CPDF_Document::LoadFontFile(CPDF_Stream* pStream)
{
    if (pStream == NULL) {
        return NULL;
    }
    return GetValidatePageData()->GetFontFileStreamAcc(pStream);
}
CPDF_ColorSpace* _CSFromName(const CFX_ByteString& name);
CPDF_ColorSpace* CPDF_Document::LoadColorSpace(CPDF_Object* pCSObj, CPDF_Dictionary* pResources)
{
    return GetValidatePageData()->GetColorSpace(pCSObj, pResources);
}
CPDF_Pattern* CPDF_Document::LoadPattern(CPDF_Object* pPatternObj, FX_BOOL bShading, const CFX_AffineMatrix* matrix)
{
    return GetValidatePageData()->GetPattern(pPatternObj, bShading, matrix);
}
CPDF_IccProfile* CPDF_Document::LoadIccProfile(CPDF_Stream* pStream, int nComponents)
{
    return GetValidatePageData()->GetIccProfile(pStream, nComponents);
}
CPDF_Image* CPDF_Document::LoadImageF(CPDF_Object* pObj)
{
    if (!pObj) {
        return NULL;
    }
    FXSYS_assert(pObj->GetObjNum());
    return GetValidatePageData()->GetImage(pObj);
}
void CPDF_Document::RemoveColorSpaceFromPageData(CPDF_Object* pCSObj)
{
    if (!pCSObj) {
        return;
    }
    GetPageData()->ReleaseColorSpace(pCSObj);
}
CPDF_DocPageData::CPDF_DocPageData(CPDF_Document *pPDFDoc)
    : m_pPDFDoc(pPDFDoc)
    , m_FontMap()
    , m_ColorSpaceMap()
    , m_PatternMap()
    , m_ImageMap()
    , m_IccProfileMap()
    , m_FontFileMap()
{
    m_FontMap.InitHashTable(64);
    m_ColorSpaceMap.InitHashTable(32);
    m_PatternMap.InitHashTable(16);
    m_ImageMap.InitHashTable(64);
    m_IccProfileMap.InitHashTable(16);
    m_FontFileMap.InitHashTable(32);
}
CPDF_DocPageData::~CPDF_DocPageData()
{
    Clear(FALSE);
    Clear(TRUE);
    FX_POSITION pos = NULL;
}
void CPDF_DocPageData::Clear(FX_BOOL bRelease)
{
    FX_POSITION pos;
    FX_DWORD	nCount;
    {
        pos = m_PatternMap.GetStartPosition();
        while (pos) {
            CPDF_Object* ptObj;
            CPDF_CountedObject<CPDF_Pattern*>* ptData;
            m_PatternMap.GetNextAssoc(pos, ptObj, ptData);
            nCount = ptData->m_nCount;
            if (bRelease || nCount < 2) {
                delete ptData->m_Obj;
                ptData->m_Obj = NULL;
            }
        }
    }
    {
        pos = m_FontMap.GetStartPosition();
        while (pos) {
            CPDF_Dictionary* fontDict;
            CPDF_CountedObject<CPDF_Font*>* fontData;
            m_FontMap.GetNextAssoc(pos, fontDict, fontData);
            nCount = fontData->m_nCount;
            if (bRelease || nCount < 2) {
                delete fontData->m_Obj;
                fontData->m_Obj = NULL;
            }
        }
    }
    {
        pos = m_ImageMap.GetStartPosition();
        while (pos) {
            FX_DWORD objNum;
            CPDF_CountedObject<CPDF_Image*>* imageData;
            m_ImageMap.GetNextAssoc(pos, objNum, imageData);
            nCount = imageData->m_nCount;
            if (bRelease || nCount < 2) {
                delete imageData->m_Obj;
                delete imageData;
                m_ImageMap.RemoveKey(objNum);
            }
        }
    }
    {
        pos = m_ColorSpaceMap.GetStartPosition();
        while (pos) {
            CPDF_Object* csKey;
            CPDF_CountedObject<CPDF_ColorSpace*>* csData;
            m_ColorSpaceMap.GetNextAssoc(pos, csKey, csData);
            nCount = csData->m_nCount;
            if (bRelease || nCount < 2) {
                csData->m_Obj->ReleaseCS();
                csData->m_Obj = NULL;
            }
        }
    }
    {
        pos = m_IccProfileMap.GetStartPosition();
        while (pos) {
            CPDF_Stream* ipKey;
            CPDF_CountedObject<CPDF_IccProfile*>* ipData;
            m_IccProfileMap.GetNextAssoc(pos, ipKey, ipData);
            nCount = ipData->m_nCount;
            if (bRelease || nCount < 2) {
                FX_POSITION pos2 = m_HashProfileMap.GetStartPosition();
                while (pos2) {
                    CFX_ByteString bsKey;
                    CPDF_Stream* pFindStream = NULL;
                    m_HashProfileMap.GetNextAssoc(pos2, bsKey, (void*&)pFindStream);
                    if (ipKey == pFindStream) {
                        m_HashProfileMap.RemoveKey(bsKey);
                        break;
                    }
                }
                delete ipData->m_Obj;
                delete ipData;
                m_IccProfileMap.RemoveKey(ipKey);
            }
        }
    }
    {
        pos = m_FontFileMap.GetStartPosition();
        while (pos) {
            CPDF_Stream* ftKey;
            CPDF_CountedObject<CPDF_StreamAcc*>* ftData;
            m_FontFileMap.GetNextAssoc(pos, ftKey, ftData);
            nCount = ftData->m_nCount;
            if (bRelease || nCount < 2) {
                delete ftData->m_Obj;
                delete ftData;
                m_FontFileMap.RemoveKey(ftKey);
            }
        }
    }
}
CPDF_Font* CPDF_DocPageData::GetFont(CPDF_Dictionary* pFontDict, FX_BOOL findOnly)
{
    if (!pFontDict) {
        return NULL;
    }
    if (findOnly) {
        CPDF_CountedObject<CPDF_Font*>* fontData;
        if (m_FontMap.Lookup(pFontDict, fontData)) {
            if (!fontData->m_Obj) {
                return NULL;
            }
            fontData->m_nCount ++;
            return fontData->m_Obj;
        }
        return NULL;
    }
    CPDF_CountedObject<CPDF_Font*>* fontData = NULL;
    if (m_FontMap.Lookup(pFontDict, fontData)) {
        if (fontData->m_Obj) {
            fontData->m_nCount ++;
            return fontData->m_Obj;
        }
    }
    FX_BOOL bNew = FALSE;
    if (!fontData) {
        fontData = FX_NEW CPDF_CountedObject<CPDF_Font*>;
        bNew = TRUE;
        if (!fontData) {
            return NULL;
        }
    }
    CPDF_Font* pFont = CPDF_Font::CreateFontF(m_pPDFDoc, pFontDict);
    if (!pFont) {
        if (bNew) {
            delete fontData;
        }
        return NULL;
    }
    fontData->m_nCount = 2;
    fontData->m_Obj = pFont;
    m_FontMap.SetAt(pFontDict, fontData);
    return pFont;
}
CPDF_Font* CPDF_DocPageData::GetStandardFont(FX_BSTR fontName, CPDF_FontEncoding* pEncoding)
{
    if (fontName.IsEmpty()) {
        return NULL;
    }
    FX_POSITION pos = m_FontMap.GetStartPosition();
    while (pos) {
        CPDF_Dictionary* fontDict;
        CPDF_CountedObject<CPDF_Font*>* fontData;
        m_FontMap.GetNextAssoc(pos, fontDict, fontData);
        CPDF_Font* pFont = fontData->m_Obj;
        if (!pFont) {
            continue;
        }
        if (pFont->GetBaseFont() != fontName) {
            continue;
        }
        if (pFont->IsEmbedded()) {
            continue;
        }
        if (pFont->GetFontType() != PDFFONT_TYPE1) {
            continue;
        }
        if (pFont->GetFontDict()->KeyExist(FX_BSTRC("Widths"))) {
            continue;
        }
        CPDF_Type1Font* pT1Font = pFont->GetType1Font();
        if (pEncoding && !pT1Font->GetEncoding()->IsIdentical(pEncoding)) {
            continue;
        }
        fontData->m_nCount ++;
        return pFont;
    }
    CPDF_Dictionary* pDict = FX_NEW CPDF_Dictionary;
    pDict->SetAtName(FX_BSTRC("Type"), FX_BSTRC("Font"));
    pDict->SetAtName(FX_BSTRC("Subtype"), FX_BSTRC("Type1"));
    pDict->SetAtName(FX_BSTRC("BaseFont"), fontName);
    if (pEncoding) {
        pDict->SetAt(FX_BSTRC("Encoding"), pEncoding->Realize());
    }
    m_pPDFDoc->AddIndirectObject(pDict);
    CPDF_CountedObject<CPDF_Font*>* fontData = FX_NEW CPDF_CountedObject<CPDF_Font*>;
    if (!fontData) {
        return NULL;
    }
    CPDF_Font* pFont = CPDF_Font::CreateFontF(m_pPDFDoc, pDict);
    if (!pFont) {
        delete fontData;
        return NULL;
    }
    fontData->m_nCount = 2;
    fontData->m_Obj = pFont;
    m_FontMap.SetAt(pDict, fontData);
    return pFont;
}
void CPDF_DocPageData::ReleaseFont(CPDF_Dictionary* pFontDict)
{
    if (!pFontDict) {
        return;
    }
    CPDF_CountedObject<CPDF_Font*>* fontData;
    if (!m_FontMap.Lookup(pFontDict, fontData)) {
        return;
    }
    if (fontData->m_Obj && --fontData->m_nCount == 0) {
        delete fontData->m_Obj;
        fontData->m_Obj = NULL;
    }
}
CPDF_ColorSpace* CPDF_DocPageData::GetColorSpace(CPDF_Object* pCSObj, CPDF_Dictionary* pResources)
{
    if (!pCSObj) {
        return NULL;
    }
    if (pCSObj->GetType() == PDFOBJ_NAME) {
        CFX_ByteString name = pCSObj->GetConstString();
        CPDF_ColorSpace* pCS = _CSFromName(name);
        if (!pCS && pResources) {
            CPDF_Dictionary* pList = pResources->GetDict(FX_BSTRC("ColorSpace"));
            if (pList) {
                pCSObj = pList->GetElementValue(name);
                return GetColorSpace(pCSObj, NULL);
            }
        }
        if (pCS == NULL || pResources == NULL) {
            return pCS;
        }
        CPDF_Dictionary* pColorSpaces = pResources->GetDict(FX_BSTRC("ColorSpace"));
        if (pColorSpaces == NULL) {
            return pCS;
        }
        CPDF_Object* pDefaultCS = NULL;
        switch (pCS->GetFamily()) {
            case PDFCS_DEVICERGB:
                pDefaultCS = pColorSpaces->GetElementValue(FX_BSTRC("DefaultRGB"));
                break;
            case PDFCS_DEVICEGRAY:
                pDefaultCS = pColorSpaces->GetElementValue(FX_BSTRC("DefaultGray"));
                break;
            case PDFCS_DEVICECMYK:
                pDefaultCS = pColorSpaces->GetElementValue(FX_BSTRC("DefaultCMYK"));
                break;
        }
        if (pDefaultCS == NULL) {
            return pCS;
        }
        return GetColorSpace(pDefaultCS, NULL);
    }
    if (pCSObj->GetType() != PDFOBJ_ARRAY) {
        return NULL;
    }
    CPDF_Array* pArray = (CPDF_Array*)pCSObj;
    if (pArray->GetCount() == 0) {
        return NULL;
    }
    if (pArray->GetCount() == 1) {
        return GetColorSpace(pArray->GetElementValue(0), pResources);
    }
    CPDF_CountedObject<CPDF_ColorSpace*>* csData = NULL;
    if (m_ColorSpaceMap.Lookup(pCSObj, csData)) {
        if (csData->m_Obj) {
            csData->m_nCount++;
            return csData->m_Obj;
        }
    }
    FX_BOOL bNew = FALSE;
    if (!csData) {
        csData = FX_NEW CPDF_CountedObject<CPDF_ColorSpace*>;
        if (!csData) {
            return NULL;
        }
        bNew = TRUE;
    }
    CPDF_ColorSpace* pCS = CPDF_ColorSpace::Load(m_pPDFDoc, pArray);
    if (!pCS) {
        if (bNew) {
            delete csData;
        }
        return NULL;
    }
    csData->m_nCount = 2;
    csData->m_Obj = pCS;
    m_ColorSpaceMap.SetAt(pCSObj, csData);
    return pCS;
}
CPDF_ColorSpace* CPDF_DocPageData::GetCopiedColorSpace(CPDF_Object* pCSObj)
{
    if (!pCSObj) {
        return NULL;
    }
    CPDF_CountedObject<CPDF_ColorSpace*>* csData;
    if (!m_ColorSpaceMap.Lookup(pCSObj, csData)) {
        return NULL;
    }
    if (!csData->m_Obj) {
        return NULL;
    }
    csData->m_nCount ++;
    return csData->m_Obj;
}
void CPDF_DocPageData::ReleaseColorSpace(CPDF_Object* pColorSpace)
{
    if (!pColorSpace) {
        return;
    }
    CPDF_CountedObject<CPDF_ColorSpace*>* csData;
    if (!m_ColorSpaceMap.Lookup(pColorSpace, csData)) {
        return;
    }
    if (csData->m_Obj && --csData->m_nCount == 0) {
        csData->m_Obj->ReleaseCS();
        csData->m_Obj = NULL;
    }
}
CPDF_Pattern* CPDF_DocPageData::GetPattern(CPDF_Object* pPatternObj, FX_BOOL bShading, const CFX_AffineMatrix* matrix)
{
    if (!pPatternObj) {
        return NULL;
    }
    CPDF_CountedObject<CPDF_Pattern*>* ptData = NULL;
    if (m_PatternMap.Lookup(pPatternObj, ptData)) {
        if (ptData->m_Obj) {
            ptData->m_nCount++;
            return ptData->m_Obj;
        }
    }
    FX_BOOL bNew = FALSE;
    if (!ptData) {
        ptData = FX_NEW CPDF_CountedObject<CPDF_Pattern*>;
        bNew = TRUE;
        if (!ptData) {
            return NULL;
        }
    }
    CPDF_Pattern* pPattern = NULL;
    if (bShading) {
        pPattern = FX_NEW CPDF_ShadingPattern(m_pPDFDoc, pPatternObj, bShading, matrix);
    } else {
        CPDF_Dictionary* pDict = pPatternObj->GetDict();
        if (pDict) {
            int type = pDict->GetInteger(FX_BSTRC("PatternType"));
            if (type == 1) {
                pPattern = FX_NEW CPDF_TilingPattern(m_pPDFDoc, pPatternObj, matrix);
            } else if (type == 2) {
                pPattern = FX_NEW CPDF_ShadingPattern(m_pPDFDoc, pPatternObj, FALSE, matrix);
            }
        }
    }
    if (!pPattern) {
        if (bNew) {
            delete ptData;
        }
        return NULL;
    }
    ptData->m_nCount = 2;
    ptData->m_Obj = pPattern;
    m_PatternMap.SetAt(pPatternObj, ptData);
    return pPattern;
}
void CPDF_DocPageData::ReleasePattern(CPDF_Object* pPatternObj)
{
    if (!pPatternObj) {
        return;
    }
    CPDF_CountedObject<CPDF_Pattern*>* ptData;
    if (!m_PatternMap.Lookup(pPatternObj, ptData)) {
        return;
    }
    if (ptData->m_Obj && --ptData->m_nCount == 0) {
        delete ptData->m_Obj;
        ptData->m_Obj = NULL;
    }
}
CPDF_Image* CPDF_DocPageData::GetImage(CPDF_Object* pImageStream)
{
    if (!pImageStream) {
        return NULL;
    }
    FX_DWORD dwImageObjNum = pImageStream->GetObjNum();
    CPDF_CountedObject<CPDF_Image*>* imageData;
    if (m_ImageMap.Lookup(dwImageObjNum, imageData)) {
        imageData->m_nCount ++;
        return imageData->m_Obj;
    }
    imageData = FX_NEW CPDF_CountedObject<CPDF_Image*>;
    if (!imageData) {
        return NULL;
    }
    CPDF_Image* pImage = FX_NEW CPDF_Image(m_pPDFDoc);
    if (!pImage) {
        delete imageData;
        return NULL;
    }
    pImage->LoadImageF((CPDF_Stream*)pImageStream, FALSE);
    imageData->m_nCount = 2;
    imageData->m_Obj = pImage;
    m_ImageMap.SetAt(dwImageObjNum, imageData);
    return pImage;
}
void CPDF_DocPageData::ReleaseImage(CPDF_Object* pImageStream)
{
    if (!pImageStream) {
        return;
    }
    PDF_DocPageData_Release<FX_DWORD, CPDF_Image*>(m_ImageMap, pImageStream->GetObjNum(), NULL);
}
CPDF_IccProfile* CPDF_DocPageData::GetIccProfile(CPDF_Stream* pIccProfileStream, FX_INT32 nComponents)
{
    if (!pIccProfileStream) {
        return NULL;
    }
    CPDF_CountedObject<CPDF_IccProfile*>* ipData = NULL;
    if (m_IccProfileMap.Lookup(pIccProfileStream, ipData)) {
        ipData->m_nCount++;
        return ipData->m_Obj;
    }
    CPDF_StreamAcc stream;
    stream.LoadAllData(pIccProfileStream, FALSE);
    FX_BYTE digest[20];
    CPDF_Stream* pCopiedStream = NULL;
    CRYPT_SHA1Generate(stream.GetData(), stream.GetSize(), digest);
    if (m_HashProfileMap.Lookup(CFX_ByteStringC(digest, 20), (void*&)pCopiedStream)) {
        m_IccProfileMap.Lookup(pCopiedStream, ipData);
        ipData->m_nCount++;
        return ipData->m_Obj;
    }
    CPDF_IccProfile* pProfile = FX_NEW CPDF_IccProfile(stream.GetData(), stream.GetSize(), nComponents);
    if (!pProfile) {
        return NULL;
    }
    ipData = FX_NEW CPDF_CountedObject<CPDF_IccProfile*>;
    if (!ipData) {
        delete pProfile;
        return NULL;
    }
    ipData->m_nCount = 2;
    ipData->m_Obj = pProfile;
    m_IccProfileMap.SetAt(pIccProfileStream, ipData);
    m_HashProfileMap.SetAt(CFX_ByteStringC(digest, 20), pIccProfileStream);
    return pProfile;
}
void CPDF_DocPageData::ReleaseIccProfile(CPDF_Stream* pIccProfileStream, CPDF_IccProfile* pIccProfile)
{
    if (!pIccProfileStream && !pIccProfile) {
        return;
    }
    CPDF_CountedObject<CPDF_IccProfile*>* ipData = NULL;
    if (m_IccProfileMap.Lookup(pIccProfileStream, ipData) && ipData->m_nCount < 2) {
        FX_POSITION pos = m_HashProfileMap.GetStartPosition();
        while (pos) {
            CFX_ByteString key;
            CPDF_Stream* pFindStream = NULL;
            m_HashProfileMap.GetNextAssoc(pos, key, (void*&)pFindStream);
            if (pIccProfileStream == pFindStream) {
                m_HashProfileMap.RemoveKey(key);
                break;
            }
        }
    }
    PDF_DocPageData_Release<CPDF_Stream*, CPDF_IccProfile*>(m_IccProfileMap, pIccProfileStream, pIccProfile);
}
CPDF_StreamAcc* CPDF_DocPageData::GetFontFileStreamAcc(CPDF_Stream* pFontStream)
{
    if (!pFontStream) {
        return NULL;
    }
    CPDF_CountedObject<CPDF_StreamAcc*>* ftData;
    if (m_FontFileMap.Lookup(pFontStream, ftData)) {
        ftData->m_nCount ++;
        return ftData->m_Obj;
    }
    ftData = FX_NEW CPDF_CountedObject<CPDF_StreamAcc*>;
    if (!ftData) {
        return NULL;
    }
    CPDF_StreamAcc* pFontFile = FX_NEW CPDF_StreamAcc;
    if (!pFontFile) {
        delete ftData;
        return NULL;
    }
    CPDF_Dictionary* pFontDict = pFontStream->GetDict();
    FX_INT32 org_size = pFontDict->GetInteger(FX_BSTRC("Length1")) + pFontDict->GetInteger(FX_BSTRC("Length2")) + pFontDict->GetInteger(FX_BSTRC("Length3"));
    if (org_size < 0) {
        org_size = 0;
    }
    pFontFile->LoadAllData(pFontStream, FALSE, org_size);
    ftData->m_nCount = 2;
    ftData->m_Obj = pFontFile;
    m_FontFileMap.SetAt(pFontStream, ftData);
    return pFontFile;
}
void CPDF_DocPageData::ReleaseFontFileStreamAcc(CPDF_Stream* pFontStream, FX_BOOL bForce)
{
    if (!pFontStream) {
        return;
    }
    PDF_DocPageData_Release<CPDF_Stream*, CPDF_StreamAcc*>(m_FontFileMap, pFontStream, NULL, bForce);
}