// 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:
		{
			if(foxit_sandbox_policy&0x01)
				return TRUE;
			else
				return FALSE;
		}
		break;
	default:
		break;
	}
	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_pRenderer->Start(pContext->m_pContext, pContext->m_pDevice, pContext->m_pOptions, 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;
}