// 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 "../../core/include/fxcodec/fx_codec.h"
#include "../../core/include/fxcrt/fx_safe_types.h"
#include "../../public/fpdf_ext.h"
#include "../../public/fpdf_progressive.h"
#include "../../public/fpdfview.h"
#include "../../third_party/base/nonstd_unique_ptr.h"
#include "../../third_party/base/numerics/safe_conversions_impl.h"
#include "../include/fsdk_define.h"
#include "../include/fsdk_mgr.h"
#include "../include/fsdk_rendercontext.h"

CPDF_CustomAccess::CPDF_CustomAccess(FPDF_FILEACCESS* pFileAccess)
{
    if (pFileAccess)
        m_FileAccess = *pFileAccess;
}

FX_BOOL CPDF_CustomAccess::ReadBlock(void* buffer, FX_FILESIZE offset, size_t size)
{
    if (offset < 0) {
        return FALSE;
    }
    FX_SAFE_FILESIZE newPos = pdfium::base::checked_cast<FX_FILESIZE, size_t>(size);
    newPos += offset;
    if (!newPos.IsValid() || newPos.ValueOrDie() > m_FileAccess.m_FileLen) {
        return FALSE;
    }
    return m_FileAccess.m_GetBlock(m_FileAccess.m_Param, offset,(uint8_t*) buffer, size);
}

//0 bit: FPDF_POLICY_MACHINETIME_ACCESS
static FX_DWORD foxit_sandbox_policy = 0xFFFFFFFF;

void FSDK_SetSandBoxPolicy(FPDF_DWORD policy, FPDF_BOOL enable)
{
    switch(policy)
    {
    case FPDF_POLICY_MACHINETIME_ACCESS:
        {
            if(enable)
                foxit_sandbox_policy |= 0x01;
            else
                foxit_sandbox_policy &= 0xFFFFFFFE;
        }
        break;
    default:
        break;
    }
}

FPDF_BOOL FSDK_IsSandBoxPolicyEnabled(FPDF_DWORD policy)
{
    switch(policy)
    {
    case FPDF_POLICY_MACHINETIME_ACCESS:
        return (foxit_sandbox_policy & 0x01) ? TRUE : FALSE;
    default:
        return FALSE;
    }
}

#ifndef _T
#define _T(x) x
#endif

CCodec_ModuleMgr* g_pCodecModule = nullptr;

#if _FX_OS_ == _FX_LINUX_EMBEDDED_
class CFontMapper : public IPDF_FontMapper
{
public:
    CFontMapper();
    virtual ~CFontMapper();

    virtual FT_Face FindSubstFont(
                            CPDF_Document* pDoc,                // [IN] The PDF document
                            const CFX_ByteString& face_name,    // [IN] Original name
                            FX_BOOL bTrueType,                  // [IN] TrueType or Type1
                            FX_DWORD flags,                     // [IN] PDF font flags (see PDF Reference section 5.7.1)
                            int font_weight,                    // [IN] original font weight. 0 for not specified
                            int CharsetCP,                      // [IN] code page for charset (see Win32 GetACP())
                            FX_BOOL bVertical,
                            CPDF_SubstFont* pSubstFont          // [OUT] Subst font data
                        );

    FT_Face m_SysFace;
};

CFontMapper* g_pFontMapper = NULL;
#endif      // #if _FX_OS_ == _FX_LINUX_EMBEDDED_

DLLEXPORT void STDCALL FPDF_InitLibrary()
{
    g_pCodecModule = new CCodec_ModuleMgr();

    CFX_GEModule::Create();
    CFX_GEModule::Get()->SetCodecModule(g_pCodecModule);

    CPDF_ModuleMgr::Create();
    CPDF_ModuleMgr::Get()->SetCodecModule(g_pCodecModule);
    CPDF_ModuleMgr::Get()->InitPageModule();
    CPDF_ModuleMgr::Get()->InitRenderModule();
    CPDF_ModuleMgr * pModuleMgr = CPDF_ModuleMgr::Get();
    if ( pModuleMgr )
    {
        pModuleMgr->LoadEmbeddedGB1CMaps();
        pModuleMgr->LoadEmbeddedJapan1CMaps();
        pModuleMgr->LoadEmbeddedCNS1CMaps();
        pModuleMgr->LoadEmbeddedKorea1CMaps();
    }
}


DLLEXPORT void STDCALL FPDF_DestroyLibrary()
{

#if _FX_OS_ == _FX_LINUX_EMBEDDED_
    delete g_pFontMapper;
    g_pFontMapper = nullptr;
#endif
    CPDF_ModuleMgr::Destroy();
    CFX_GEModule::Destroy();
    delete g_pCodecModule;
    g_pCodecModule = nullptr;
}

#ifndef _WIN32
int g_LastError;
void SetLastError(int err)
{
    g_LastError = err;
}

int GetLastError()
{
    return g_LastError;
}
#endif

void ProcessParseError(FX_DWORD err_code)
{
    // Translate FPDFAPI error code to FPDFVIEW error code
    switch (err_code) {
        case PDFPARSE_ERROR_FILE:
            err_code = FPDF_ERR_FILE;
            break;
        case PDFPARSE_ERROR_FORMAT:
            err_code = FPDF_ERR_FORMAT;
            break;
        case PDFPARSE_ERROR_PASSWORD:
            err_code = FPDF_ERR_PASSWORD;
            break;
        case PDFPARSE_ERROR_HANDLER:
            err_code = FPDF_ERR_SECURITY;
            break;
    }
    SetLastError(err_code);
}

DLLEXPORT void  STDCALL FPDF_SetSandBoxPolicy(FPDF_DWORD policy, FPDF_BOOL enable)
{
    return FSDK_SetSandBoxPolicy(policy, enable);
}

DLLEXPORT FPDF_DOCUMENT STDCALL FPDF_LoadDocument(FPDF_STRING file_path, FPDF_BYTESTRING password)
{
    CPDF_Parser* pParser = new CPDF_Parser;
    pParser->SetPassword(password);

    FX_DWORD err_code = pParser->StartParse((const FX_CHAR*)file_path);
    if (err_code) {
        delete pParser;
        ProcessParseError(err_code);
        return NULL;
    }
    return pParser->GetDocument();
}

extern void CheckUnSupportError(CPDF_Document * pDoc, FX_DWORD err_code);

class CMemFile final: public IFX_FileRead
{
public:
    CMemFile(uint8_t* pBuf, FX_FILESIZE size):m_pBuf(pBuf),m_size(size) {}

    virtual void            Release() {delete this;}
    virtual FX_FILESIZE     GetSize() {return m_size;}
    virtual FX_BOOL         ReadBlock(void* buffer, FX_FILESIZE offset, size_t size)
    {
            if (offset < 0) {
                return FALSE;
            }
            FX_SAFE_FILESIZE newPos = pdfium::base::checked_cast<FX_FILESIZE, size_t>(size);
            newPos += offset;
            if (!newPos.IsValid() || newPos.ValueOrDie() > (FX_DWORD)m_size) {
                return FALSE;
            }
        FXSYS_memcpy(buffer, m_pBuf+offset, size);
        return TRUE;
    }
private:
    uint8_t* m_pBuf;
    FX_FILESIZE m_size;
};
DLLEXPORT FPDF_DOCUMENT STDCALL FPDF_LoadMemDocument(const void* data_buf, int size, FPDF_BYTESTRING password)
{
    CPDF_Parser* pParser = new CPDF_Parser;
    pParser->SetPassword(password);
    CMemFile* pMemFile = new CMemFile((uint8_t*)data_buf, size);
    FX_DWORD err_code = pParser->StartParse(pMemFile);
    if (err_code) {
        delete pParser;
        ProcessParseError(err_code);
        return NULL;
    }
    CPDF_Document * pDoc = NULL;
    pDoc = pParser?pParser->GetDocument():NULL;
    CheckUnSupportError(pDoc, err_code);
    return pParser->GetDocument();
}

DLLEXPORT FPDF_DOCUMENT STDCALL FPDF_LoadCustomDocument(FPDF_FILEACCESS* pFileAccess, FPDF_BYTESTRING password)
{
    CPDF_Parser* pParser = new CPDF_Parser;
    pParser->SetPassword(password);
    CPDF_CustomAccess* pFile = new CPDF_CustomAccess(pFileAccess);
    FX_DWORD err_code = pParser->StartParse(pFile);
    if (err_code) {
        delete pParser;
        ProcessParseError(err_code);
        return NULL;
    }
    CPDF_Document * pDoc = NULL;
    pDoc = pParser?pParser->GetDocument():NULL;
    CheckUnSupportError(pDoc, err_code);
    return pParser->GetDocument();
}

DLLEXPORT FPDF_BOOL STDCALL FPDF_GetFileVersion(FPDF_DOCUMENT doc, int* fileVersion)
{
    if(!doc||!fileVersion) return FALSE;
    *fileVersion = 0;
    CPDF_Document* pDoc = (CPDF_Document*)doc;
    CPDF_Parser* pParser = (CPDF_Parser*)pDoc->GetParser();
    if(!pParser)
        return FALSE;
    *fileVersion = pParser->GetFileVersion();
    return TRUE;
}

// jabdelmalek: changed return type from FX_DWORD to build on Linux (and match header).
DLLEXPORT unsigned long STDCALL FPDF_GetDocPermissions(FPDF_DOCUMENT document)
{
    if (document == NULL) return 0;
    CPDF_Document*pDoc = (CPDF_Document*)document;
    CPDF_Parser* pParser =  (CPDF_Parser*)pDoc->GetParser();
    CPDF_Dictionary* pDict = pParser->GetEncryptDict();
    if (pDict == NULL) return (FX_DWORD)-1;

    return pDict->GetInteger("P");
}

DLLEXPORT int STDCALL FPDF_GetSecurityHandlerRevision(FPDF_DOCUMENT document)
{
    if (document == NULL) return -1;
    CPDF_Document*pDoc = (CPDF_Document*)document;
    CPDF_Parser* pParser = (CPDF_Parser*)pDoc->GetParser();
    CPDF_Dictionary* pDict = pParser->GetEncryptDict();
    if (pDict == NULL) return -1;

    return pDict->GetInteger("R");
}

DLLEXPORT int STDCALL FPDF_GetPageCount(FPDF_DOCUMENT document)
{
    if (document == NULL) return 0;
    return ((CPDF_Document*)document)->GetPageCount();
}

DLLEXPORT FPDF_PAGE STDCALL FPDF_LoadPage(FPDF_DOCUMENT document, int page_index)
{
    if (document == NULL) return NULL;
    if (page_index < 0 || page_index >= FPDF_GetPageCount(document)) return NULL;

    CPDF_Document* pDoc = (CPDF_Document*)document;
    if (pDoc == NULL) return NULL;
    CPDF_Dictionary* pDict = pDoc->GetPage(page_index);
    if (pDict == NULL) return NULL;
    CPDF_Page* pPage = new CPDF_Page;
    pPage->Load(pDoc, pDict);
    pPage->ParseContent();
    return pPage;
}

DLLEXPORT double STDCALL FPDF_GetPageWidth(FPDF_PAGE page)
{
    if (!page)
        return 0.0;
    return ((CPDF_Page*)page)->GetPageWidth();
}

DLLEXPORT double STDCALL FPDF_GetPageHeight(FPDF_PAGE page)
{
    if (!page) return 0.0;
    return ((CPDF_Page*)page)->GetPageHeight();
}

void DropContext(void* data)
{
    delete (CRenderContext*)data;
}

#if defined(_DEBUG) || defined(DEBUG)
#define DEBUG_TRACE
#endif

#if defined(_WIN32)
DLLEXPORT void STDCALL FPDF_RenderPage(HDC dc, FPDF_PAGE page, int start_x, int start_y, int size_x, int size_y,
                        int rotate, int flags)
{
    if (page==NULL) return;
    CPDF_Page* pPage = (CPDF_Page*)page;

    CRenderContext* pContext = new CRenderContext;
    pPage->SetPrivateData((void*)1, pContext, DropContext);

#ifndef _WIN32_WCE
    CFX_DIBitmap* pBitmap = NULL;
    FX_BOOL bBackgroundAlphaNeeded=FALSE;
    bBackgroundAlphaNeeded = pPage->BackgroundAlphaNeeded();
    if (bBackgroundAlphaNeeded)
    {

        pBitmap = new CFX_DIBitmap;
        pBitmap->Create(size_x, size_y, FXDIB_Argb);
        pBitmap->Clear(0x00ffffff);
#ifdef _SKIA_SUPPORT_
        pContext->m_pDevice = new CFX_SkiaDevice;
        ((CFX_SkiaDevice*)pContext->m_pDevice)->Attach((CFX_DIBitmap*)pBitmap);
#else
        pContext->m_pDevice = new CFX_FxgeDevice;
        ((CFX_FxgeDevice*)pContext->m_pDevice)->Attach((CFX_DIBitmap*)pBitmap);
#endif
    }
    else
        pContext->m_pDevice = new CFX_WindowsDevice(dc);

    FPDF_RenderPage_Retail(pContext, page, start_x, start_y, size_x, size_y,
                           rotate, flags, TRUE, NULL);

    if (bBackgroundAlphaNeeded)
    {
        if (pBitmap)
        {
            CFX_WindowsDevice WinDC(dc);

            if (WinDC.GetDeviceCaps(FXDC_DEVICE_CLASS) == FXDC_PRINTER)
            {
                CFX_DIBitmap* pDst = new CFX_DIBitmap;
                int pitch = pBitmap->GetPitch();
                pDst->Create(size_x, size_y, FXDIB_Rgb32);
                FXSYS_memset(pDst->GetBuffer(), -1, pitch*size_y);
                pDst->CompositeBitmap(0, 0, size_x, size_y, pBitmap, 0, 0, FXDIB_BLEND_NORMAL, NULL, FALSE, NULL);
                WinDC.StretchDIBits(pDst,0,0,size_x,size_y);
                delete pDst;
            }
            else
                WinDC.SetDIBits(pBitmap,0,0);

        }
    }
#else
    // get clip region
    RECT rect, cliprect;
    rect.left = start_x;
    rect.top = start_y;
    rect.right = start_x + size_x;
    rect.bottom = start_y + size_y;
    GetClipBox(dc, &cliprect);
    IntersectRect(&rect, &rect, &cliprect);
    int width = rect.right - rect.left;
    int height = rect.bottom - rect.top;

#ifdef DEBUG_TRACE
    {
        char str[128];
        memset(str, 0, sizeof(str));
        FXSYS_snprintf(str, sizeof(str) - 1, "Rendering DIB %d x %d", width, height);
        CPDF_ModuleMgr::Get()->ReportError(999, str);
    }
#endif

    // Create a DIB section
    LPVOID pBuffer;
    BITMAPINFOHEADER bmih;
    FXSYS_memset(&bmih, 0, sizeof bmih);
    bmih.biSize = sizeof bmih;
    bmih.biBitCount = 24;
    bmih.biHeight = -height;
    bmih.biPlanes = 1;
    bmih.biWidth = width;
    pContext->m_hBitmap = CreateDIBSection(dc, (BITMAPINFO*)&bmih, DIB_RGB_COLORS, &pBuffer, NULL, 0);
    if (pContext->m_hBitmap == NULL) {
#if defined(DEBUG) || defined(_DEBUG)
        char str[128];
        memset(str, 0, sizeof(str));
        FXSYS_snprintf(str, sizeof(str) - 1, "Error CreateDIBSection: %d x %d, error code = %d", width, height, GetLastError());
        CPDF_ModuleMgr::Get()->ReportError(FPDFERR_OUT_OF_MEMORY, str);
#else
        CPDF_ModuleMgr::Get()->ReportError(FPDFERR_OUT_OF_MEMORY, NULL);
#endif
    }
    FXSYS_memset(pBuffer, 0xff, height*((width*3+3)/4*4));

#ifdef DEBUG_TRACE
    {
        CPDF_ModuleMgr::Get()->ReportError(999, "DIBSection created");
    }
#endif

    // Create a device with this external buffer
    pContext->m_pBitmap = new CFX_DIBitmap;
    pContext->m_pBitmap->Create(width, height, FXDIB_Rgb, (uint8_t*)pBuffer);
    pContext->m_pDevice = new CPDF_FxgeDevice;
    ((CPDF_FxgeDevice*)pContext->m_pDevice)->Attach(pContext->m_pBitmap);

#ifdef DEBUG_TRACE
    CPDF_ModuleMgr::Get()->ReportError(999, "Ready for PDF rendering");
#endif

    // output to bitmap device
    FPDF_RenderPage_Retail(pContext, page, start_x - rect.left,
                           start_y - rect.top, size_x, size_y, rotate, flags);

#ifdef DEBUG_TRACE
    CPDF_ModuleMgr::Get()->ReportError(999, "Finished PDF rendering");
#endif

    // Now output to real device
    HDC hMemDC = CreateCompatibleDC(dc);
    if (hMemDC == NULL) {
#if defined(DEBUG) || defined(_DEBUG)
        char str[128];
        memset(str, 0, sizeof(str));
        FXSYS_snprintf(str, sizeof(str) - 1, "Error CreateCompatibleDC. Error code = %d", GetLastError());
        CPDF_ModuleMgr::Get()->ReportError(FPDFERR_OUT_OF_MEMORY, str);
#else
        CPDF_ModuleMgr::Get()->ReportError(FPDFERR_OUT_OF_MEMORY, NULL);
#endif
    }

    HGDIOBJ hOldBitmap = SelectObject(hMemDC, pContext->m_hBitmap);

#ifdef DEBUG_TRACE
    CPDF_ModuleMgr::Get()->ReportError(999, "Ready for screen rendering");
#endif

    BitBlt(dc, rect.left, rect.top, width, height, hMemDC, 0, 0, SRCCOPY);
    SelectObject(hMemDC, hOldBitmap);
    DeleteDC(hMemDC);

#ifdef DEBUG_TRACE
    CPDF_ModuleMgr::Get()->ReportError(999, "Finished screen rendering");
#endif

#endif
    if (bBackgroundAlphaNeeded) {
        delete pBitmap;
        pBitmap = NULL;
    }
    delete pContext;
    pPage->RemovePrivateData((void*)1);
}
#endif

DLLEXPORT void STDCALL FPDF_RenderPageBitmap(FPDF_BITMAP bitmap, FPDF_PAGE page, int start_x, int start_y,
                        int size_x, int size_y, int rotate, int flags)
{
    if (bitmap == NULL || page == NULL) return;
    CPDF_Page* pPage = (CPDF_Page*)page;


    CRenderContext* pContext = new CRenderContext;
    pPage->SetPrivateData((void*)1, pContext, DropContext);
#ifdef _SKIA_SUPPORT_
    pContext->m_pDevice = new CFX_SkiaDevice;

    if (flags & FPDF_REVERSE_BYTE_ORDER)
        ((CFX_SkiaDevice*)pContext->m_pDevice)->Attach((CFX_DIBitmap*)bitmap,0,TRUE);
    else
        ((CFX_SkiaDevice*)pContext->m_pDevice)->Attach((CFX_DIBitmap*)bitmap);
#else
    pContext->m_pDevice = new CFX_FxgeDevice;

    if (flags & FPDF_REVERSE_BYTE_ORDER)
        ((CFX_FxgeDevice*)pContext->m_pDevice)->Attach((CFX_DIBitmap*)bitmap,0,TRUE);
    else
        ((CFX_FxgeDevice*)pContext->m_pDevice)->Attach((CFX_DIBitmap*)bitmap);
#endif

    FPDF_RenderPage_Retail(pContext, page, start_x, start_y, size_x, size_y,
                           rotate, flags, TRUE, NULL);

    delete pContext;
    pPage->RemovePrivateData((void*)1);
}

DLLEXPORT void STDCALL FPDF_ClosePage(FPDF_PAGE page)
{
    if (!page) return;
        CPDFSDK_PageView* pPageView = (CPDFSDK_PageView*)(((CPDF_Page*)page))->GetPrivateData((void*)page);
        if (pPageView && pPageView->IsLocked()) {
            pPageView->TakeOverPage();
            return;
        }
    delete (CPDF_Page*)page;

}

DLLEXPORT void STDCALL FPDF_CloseDocument(FPDF_DOCUMENT document)
{
    if (!document)
        return;
    CPDF_Document* pDoc = (CPDF_Document*)document;
    CPDF_Parser* pParser = (CPDF_Parser*)pDoc->GetParser();
    if (pParser == NULL)
    {
        delete pDoc;
        return;
    }
    delete pParser;
}

DLLEXPORT unsigned long STDCALL FPDF_GetLastError()
{
    return GetLastError();
}

DLLEXPORT void STDCALL FPDF_DeviceToPage(FPDF_PAGE page, int start_x, int start_y, int size_x, int size_y,
                        int rotate, int device_x, int device_y, double* page_x, double* page_y)
{
    if (page == NULL || page_x == NULL || page_y == NULL) return;
    CPDF_Page* pPage = (CPDF_Page*)page;

    CPDF_Matrix page2device;
    pPage->GetDisplayMatrix(page2device, start_x, start_y, size_x, size_y, rotate);
    CPDF_Matrix device2page;
    device2page.SetReverse(page2device);

    FX_FLOAT page_x_f, page_y_f;
    device2page.Transform((FX_FLOAT)(device_x), (FX_FLOAT)(device_y), page_x_f, page_y_f);

    *page_x = (page_x_f);
    *page_y = (page_y_f);
}

DLLEXPORT void STDCALL FPDF_PageToDevice(FPDF_PAGE page, int start_x, int start_y, int size_x, int size_y,
                        int rotate, double page_x, double page_y, int* device_x, int* device_y)
{
    if (page == NULL || device_x == NULL || device_y == NULL) return;
    CPDF_Page* pPage = (CPDF_Page*)page;

    CPDF_Matrix page2device;
    pPage->GetDisplayMatrix(page2device, start_x, start_y, size_x, size_y, rotate);

    FX_FLOAT device_x_f, device_y_f;
    page2device.Transform(((FX_FLOAT)page_x), ((FX_FLOAT)page_y), device_x_f, device_y_f);

    *device_x = FXSYS_round(device_x_f);
    *device_y = FXSYS_round(device_y_f);
}

DLLEXPORT FPDF_BITMAP STDCALL FPDFBitmap_Create(int width, int height, int alpha)
{
    nonstd::unique_ptr<CFX_DIBitmap> pBitmap(new CFX_DIBitmap);
    if (!pBitmap->Create(width, height, alpha ? FXDIB_Argb : FXDIB_Rgb32)) {
        return NULL;
    }
    return pBitmap.release();
}

DLLEXPORT FPDF_BITMAP STDCALL FPDFBitmap_CreateEx(int width, int height, int format, void* first_scan, int stride)
{
    FXDIB_Format fx_format;
    switch (format) {
        case FPDFBitmap_Gray:
            fx_format = FXDIB_8bppRgb;
            break;
        case FPDFBitmap_BGR:
            fx_format = FXDIB_Rgb;
            break;
        case FPDFBitmap_BGRx:
            fx_format = FXDIB_Rgb32;
            break;
        case FPDFBitmap_BGRA:
            fx_format = FXDIB_Argb;
            break;
        default:
            return NULL;
    }
    CFX_DIBitmap* pBitmap = new CFX_DIBitmap;
    pBitmap->Create(width, height, fx_format, (uint8_t*)first_scan, stride);
    return pBitmap;
}

DLLEXPORT void STDCALL FPDFBitmap_FillRect(FPDF_BITMAP bitmap, int left, int top, int width, int height, FPDF_DWORD color)
{
    if (bitmap == NULL) return;
#ifdef _SKIA_SUPPORT_
    CFX_SkiaDevice device;
#else
    CFX_FxgeDevice device;
#endif
    device.Attach((CFX_DIBitmap*)bitmap);
    if (!((CFX_DIBitmap*)bitmap)->HasAlpha()) color |= 0xFF000000;
    FX_RECT rect(left, top, left+width, top+height);
    device.FillRect(&rect, color);
}

DLLEXPORT void* STDCALL FPDFBitmap_GetBuffer(FPDF_BITMAP bitmap)
{
    if (bitmap == NULL) return NULL;
    return ((CFX_DIBitmap*)bitmap)->GetBuffer();
}

DLLEXPORT int STDCALL FPDFBitmap_GetWidth(FPDF_BITMAP bitmap)
{
    if (bitmap == NULL) return 0;
    return ((CFX_DIBitmap*)bitmap)->GetWidth();
}

DLLEXPORT int STDCALL FPDFBitmap_GetHeight(FPDF_BITMAP bitmap)
{
    if (bitmap == NULL) return 0;
    return ((CFX_DIBitmap*)bitmap)->GetHeight();
}

DLLEXPORT int STDCALL FPDFBitmap_GetStride(FPDF_BITMAP bitmap)
{
    if (bitmap == NULL) return 0;
    return ((CFX_DIBitmap*)bitmap)->GetPitch();
}

DLLEXPORT void STDCALL FPDFBitmap_Destroy(FPDF_BITMAP bitmap)
{
    delete (CFX_DIBitmap*)bitmap;
}

void FPDF_RenderPage_Retail(CRenderContext* pContext, FPDF_PAGE page, int start_x, int start_y, int size_x, int size_y,
                            int rotate, int flags,FX_BOOL bNeedToRestore, IFSDK_PAUSE_Adapter * pause )
{
    CPDF_Page* pPage = (CPDF_Page*)page;
    if (pPage == NULL) return;

    if (!pContext->m_pOptions)
        pContext->m_pOptions = new CPDF_RenderOptions;

    if (flags & FPDF_LCD_TEXT)
        pContext->m_pOptions->m_Flags |= RENDER_CLEARTYPE;
    else
        pContext->m_pOptions->m_Flags &= ~RENDER_CLEARTYPE;
    if (flags & FPDF_NO_NATIVETEXT)
        pContext->m_pOptions->m_Flags |= RENDER_NO_NATIVETEXT;
    if (flags & FPDF_RENDER_LIMITEDIMAGECACHE)
        pContext->m_pOptions->m_Flags |= RENDER_LIMITEDIMAGECACHE;
    if (flags & FPDF_RENDER_FORCEHALFTONE)
        pContext->m_pOptions->m_Flags |= RENDER_FORCE_HALFTONE;
    if (flags & FPDF_RENDER_NO_SMOOTHTEXT)
        pContext->m_pOptions->m_Flags |= RENDER_NOTEXTSMOOTH;
    if (flags & FPDF_RENDER_NO_SMOOTHIMAGE)
        pContext->m_pOptions->m_Flags |= RENDER_NOIMAGESMOOTH;
    if (flags & FPDF_RENDER_NO_SMOOTHPATH)
        pContext->m_pOptions->m_Flags |= RENDER_NOPATHSMOOTH;
    //Grayscale output
    if (flags & FPDF_GRAYSCALE)
    {
        pContext->m_pOptions->m_ColorMode = RENDER_COLOR_GRAY;
        pContext->m_pOptions->m_ForeColor = 0;
        pContext->m_pOptions->m_BackColor = 0xffffff;
    }
    const CPDF_OCContext::UsageType usage = (flags & FPDF_PRINTING) ? CPDF_OCContext::Print : CPDF_OCContext::View;
    pContext->m_pOptions->m_AddFlags = flags >> 8;
    pContext->m_pOptions->m_pOCContext = new CPDF_OCContext(pPage->m_pDocument, usage);

    CFX_AffineMatrix matrix;
    pPage->GetDisplayMatrix(matrix, start_x, start_y, size_x, size_y, rotate);

    FX_RECT clip;
    clip.left = start_x;
    clip.right = start_x + size_x;
    clip.top = start_y;
    clip.bottom = start_y + size_y;
    pContext->m_pDevice->SaveState();
    pContext->m_pDevice->SetClip_Rect(&clip);

    pContext->m_pContext = new CPDF_RenderContext;
    pContext->m_pContext->Create(pPage);
    pContext->m_pContext->AppendObjectList(pPage, &matrix);

    if (flags & FPDF_ANNOT) {
        pContext->m_pAnnots = new CPDF_AnnotList(pPage);
        FX_BOOL bPrinting = pContext->m_pDevice->GetDeviceClass() != FXDC_DISPLAY;
        pContext->m_pAnnots->DisplayAnnots(pPage, pContext->m_pContext, bPrinting, &matrix, TRUE, NULL);
    }

    pContext->m_pRenderer = new CPDF_ProgressiveRenderer(
        pContext->m_pContext, pContext->m_pDevice, pContext->m_pOptions);
    pContext->m_pRenderer->Start(pause);
    if (bNeedToRestore)
        pContext->m_pDevice->RestoreState();
}

DLLEXPORT int STDCALL FPDF_GetPageSizeByIndex(FPDF_DOCUMENT document, int page_index, double* width, double* height)
{
    CPDF_Document* pDoc = (CPDF_Document*)document;
    if(pDoc == NULL)
        return FALSE;

    CPDF_Dictionary* pDict = pDoc->GetPage(page_index);
    if (pDict == NULL) return FALSE;

    CPDF_Page page;
    page.Load(pDoc, pDict);
    *width = page.GetPageWidth();
    *height = page.GetPageHeight();

    return TRUE;
}

DLLEXPORT FPDF_BOOL STDCALL FPDF_VIEWERREF_GetPrintScaling(FPDF_DOCUMENT document)
{
    CPDF_Document* pDoc = (CPDF_Document*)document;
    if (!pDoc) return TRUE;
    CPDF_ViewerPreferences viewRef(pDoc);
    return viewRef.PrintScaling();
}

DLLEXPORT int STDCALL FPDF_VIEWERREF_GetNumCopies(FPDF_DOCUMENT document)
{
    CPDF_Document* pDoc = (CPDF_Document*)document;
    if (!pDoc) return 1;
    CPDF_ViewerPreferences viewRef(pDoc);
    return viewRef.NumCopies();
}

DLLEXPORT FPDF_PAGERANGE STDCALL FPDF_VIEWERREF_GetPrintPageRange(FPDF_DOCUMENT document)
{
    CPDF_Document* pDoc = (CPDF_Document*)document;
    if (!pDoc) return NULL;
    CPDF_ViewerPreferences viewRef(pDoc);
    return viewRef.PrintPageRange();
}

DLLEXPORT FPDF_DUPLEXTYPE STDCALL FPDF_VIEWERREF_GetDuplex(FPDF_DOCUMENT document)
{
    CPDF_Document* pDoc = (CPDF_Document*)document;
    if (!pDoc) return DuplexUndefined;
    CPDF_ViewerPreferences viewRef(pDoc);
    CFX_ByteString duplex = viewRef.Duplex();
    if (FX_BSTRC("Simplex") == duplex)
        return Simplex;
    if (FX_BSTRC("DuplexFlipShortEdge") == duplex)
        return DuplexFlipShortEdge;
    if (FX_BSTRC("DuplexFlipLongEdge") == duplex)
        return DuplexFlipLongEdge;
    return DuplexUndefined;
}

DLLEXPORT FPDF_DWORD STDCALL FPDF_CountNamedDests(FPDF_DOCUMENT document)
{
    if (!document) return 0;
    CPDF_Document* pDoc = (CPDF_Document*)document;

    CPDF_Dictionary* pRoot = pDoc->GetRoot();
    if (!pRoot) return 0;

    CPDF_NameTree nameTree(pDoc, FX_BSTRC("Dests"));
    int count = nameTree.GetCount();
    CPDF_Dictionary* pDest = pRoot->GetDict(FX_BSTRC("Dests"));
    if (pDest)
        count += pDest->GetCount();
    return count;
}

DLLEXPORT FPDF_DEST STDCALL FPDF_GetNamedDestByName(FPDF_DOCUMENT document,FPDF_BYTESTRING name)
{
    if (!document)
        return NULL;
    if (!name || name[0] == 0)
        return NULL;

    CPDF_Document* pDoc = (CPDF_Document*)document;
    CPDF_NameTree name_tree(pDoc, FX_BSTRC("Dests"));
    return name_tree.LookupNamedDest(pDoc, name);
}

DLLEXPORT FPDF_DEST STDCALL FPDF_GetNamedDest(FPDF_DOCUMENT document, int index, void* buffer, long* buflen)
{
    if (!buffer)
        *buflen = 0;
    if (!document || index < 0) return NULL;
    CPDF_Document* pDoc = (CPDF_Document*)document;

    CPDF_Dictionary* pRoot = pDoc->GetRoot();
    if (!pRoot) return NULL;

    CPDF_Object* pDestObj = NULL;
    CFX_ByteString bsName;
    CPDF_NameTree nameTree(pDoc, FX_BSTRC("Dests"));
    int count = nameTree.GetCount();
    if (index >= count) {
        CPDF_Dictionary* pDest = pRoot->GetDict(FX_BSTRC("Dests"));
        if (!pDest) return NULL;
        if (index >= count + pDest->GetCount()) return NULL;
        index -= count;
        FX_POSITION pos = pDest->GetStartPos();
        int i = 0;
        while (pos) {
            pDestObj = pDest->GetNextElement(pos, bsName);
            if (!pDestObj) continue;
            if (i == index) break;
            i++;
        }
    } else {
        pDestObj = nameTree.LookupValue(index, bsName);
    }
    if (!pDestObj) return NULL;
    if (pDestObj->GetType() == PDFOBJ_DICTIONARY) {
        pDestObj = ((CPDF_Dictionary*)pDestObj)->GetArray(FX_BSTRC("D"));
        if (!pDestObj) return NULL;
    }
    if (pDestObj->GetType() != PDFOBJ_ARRAY) return NULL;
    CFX_WideString wsName = PDF_DecodeText(bsName);
    CFX_ByteString utf16Name = wsName.UTF16LE_Encode();
    unsigned int len = utf16Name.GetLength();
    if (!buffer) {
        *buflen = len;
    } else if (*buflen >= len) {
        memcpy(buffer, utf16Name.c_str(), len);
        *buflen = len;
    } else {
        *buflen = -1;
    }
    return (FPDF_DEST)pDestObj;
}