// TestPlugin.cpp : Defines the exported functions for the DLL application.
//

#include "stdafx.h"


// Define the exported DLL functions
extern "C"
{
	__declspec(dllexport) BOOL DVP_USBSafe(LPOPUSUSBSAFEDATA pUSBSafeData);
	__declspec(dllexport) BOOL DVP_Identify(LPVIEWERPLUGININFO lpVPInfo);
	__declspec(dllexport) BOOL DVP_IdentifyFile(HWND hWnd,LPSTR lpszName,LPVIEWERPLUGINFILEINFO lpVPFileInfo,HANDLE hAbortEvent);
	__declspec(dllexport) BOOL DVP_IdentifyFileStream(HWND hWnd,LPSTREAM lpStream,LPSTR lpszName,LPVIEWERPLUGINFILEINFO lpVPFileInfo,DWORD dwStreamFlags);
	__declspec(dllexport) BOOL DVP_LoadTextA(LPDVPLOADTEXTDATAA lpLoadTextData);
	__declspec(dllexport) BOOL DVP_LoadTextW(LPDVPLOADTEXTDATAW lpLoadTextData);
};

// {19E1003B-072E-42d8-B361-0EF64B47DE9A}
static const GUID GUIDPlugin_Torrent = 
{ 0x19e1003b, 0x72e, 0x42d8, { 0xb3, 0x61, 0xe, 0xf6, 0x4b, 0x47, 0xde, 0x9a } };

BOOL DVP_USBSafe(LPOPUSUSBSAFEDATA pUSBSafeData)
{
	return TRUE;
}

// Identify the viewer plugin to DOpus
BOOL DVP_Identify(LPVIEWERPLUGININFO lpVPInfo)
{
	// Plugin flags; we can handle streams, and only use filename extensions for identification for slow and non-random seeking media
	lpVPInfo->dwFlags = DVPFIF_ExtensionsOnly |
						DVPFIF_CanHandleStreams |
						DVPFIF_NoThumbnails |
						DVPFIF_NoFileInformation;

	// Version number (1.0.0.1)
	lpVPInfo->dwVersionHigh = MAKELONG(0,1); // Use MAKELONG instead of MAKELPARAM to avoid error assigning to DWORD under 64-bit.
	lpVPInfo->dwVersionLow = MAKELONG(1,0);

	// Preferred filename extension is .torrent
	lpVPInfo->lpszHandleExts = TEXT(".torrent");

	// Plugin information
	lpVPInfo->lpszName = TEXT("Torrent");
	lpVPInfo->lpszDescription = TEXT("Torrent Viewer Plugin");
	lpVPInfo->lpszCopyright = TEXT("(c) Copyright 2009 Richard Fortier");
	lpVPInfo->lpszURL = TEXT("http://www.example.com"); // In Opus 9.1.1.7 and below you need to return a URL to avoid the About button crashing.

	// Major type of file we handle is text
	lpVPInfo->uiMajorFileType = DVPMajorType_Text;

	lpVPInfo->dwlMinFileSize = 0;
	lpVPInfo->dwlMaxFileSize = 0;
	lpVPInfo->dwlMinPreviewFileSize = lpVPInfo->dwlMinFileSize;
	lpVPInfo->dwlMaxPreviewFileSize = lpVPInfo->dwlMaxFileSize;

	// Our GUID to uniquely identify us to DOpus
	lpVPInfo->idPlugin = GUIDPlugin_Torrent;
	return TRUE;
}

// Identify a local disk-based file
BOOL DVP_IdentifyFile(HWND hWnd,LPSTR lpszName,LPVIEWERPLUGINFILEINFO lpVPFileInfo,HANDLE hAbortEvent)
{
	lpVPFileInfo->dwFlags = DVPFIF_ReturnsText|DVPFIF_CanReturnViewer; // In Opus 9.1.1.7 and below you need to set DVPFIF_CanReturnViewer in order for DVPFIF_ReturnsText to work.
	lpVPFileInfo->wMajorType = DVPMajorType_Text;
	lpVPFileInfo->wMinorType = 0;
	lpVPFileInfo->iTypeHint = DVPFITypeHint_PlainText;
	lpVPFileInfo->szImageSize.cx = 0;
 	lpVPFileInfo->szImageSize.cy = 0;
	lpVPFileInfo->iNumBits = 0;
	if (lpVPFileInfo->lpszInfo != 0 && lpVPFileInfo->cchInfoMax != 0) {
		lpVPFileInfo->lpszInfo[0] = TEXT('\0');
	}
	return TRUE;
}

// Identify a stream-based file
BOOL DVP_IdentifyFileStream(HWND hWnd,LPSTREAM lpStream,LPSTR lpszName,LPVIEWERPLUGINFILEINFO lpVPFileInfo,DWORD dwStreamFlags)
{
	return DVP_IdentifyFile(hWnd, lpszName, lpVPFileInfo, NULL);
}

BOOL DVP_LoadTextA(LPDVPLOADTEXTDATAA lpLoadTextData)
{
	// This will never actually be called since DVP_LoadTextW is given preference.
	// However, there's a bug in Opus 9.1.1.7 and below where neither DVP_LoadText
	// function will be called unless both are exported by the DLL.
	return FALSE;
}

BOOL DVP_LoadTextW(LPDVPLOADTEXTDATAW lpLoadTextData)
{
	lpLoadTextData->iOutTextType = DVPText_Plain;

	lpLoadTextData->lpOutStream = 0;

	ULONG nb = 0;

	// It's our job to create the result stream.
	// CreateStreamOnHGlobal with NULL first argument creates a new in-memory stream.
	if (S_OK == CreateStreamOnHGlobal(NULL, TRUE, &lpLoadTextData->lpOutStream)
	&&	0    != lpLoadTextData->lpOutStream)
	{
		bool bSourceTextIsUnicode = false;

		if (bSourceTextIsUnicode)
		{
			// If we write Unicode into the stream it must start with the UTF-16 BOM.
			const wchar_t wcUTF16BOM = L'\xFEFF';

			if (S_OK == lpLoadTextData->lpOutStream->Write(&wcUTF16BOM, sizeof(wcUTF16BOM), &nb)
			&&	sizeof(wcUTF16BOM) == nb)
			{
				const wchar_t *szTextToWrite = L"salut (Unicode)";
				ULONG ulBytesToWrite = wcslen(szTextToWrite) * sizeof(szTextToWrite[0]); // Don't write the null-terminator to the stream.

				if (S_OK == lpLoadTextData->lpOutStream->Write(szTextToWrite, ulBytesToWrite, &nb)
				&&	nb == ulBytesToWrite)
				{
					return TRUE;
				}
			}	
		}
		else
		{
			const char *szTextToWrite = "salut (ANSI)";
			ULONG ulBytesToWrite = strlen(szTextToWrite) * sizeof(szTextToWrite[0]); // Don't write the null-terminator to the stream.

			if (S_OK == lpLoadTextData->lpOutStream->Write(szTextToWrite, ulBytesToWrite, &nb)
			&&	nb == ulBytesToWrite)
			{
				return TRUE;
			}
		}
	}

	if (0 != lpLoadTextData->lpOutStream)
	{
		// If we failed then it's our job to release the stream we created.
		lpLoadTextData->lpOutStream->Release();
		lpLoadTextData->lpOutStream = 0;
	}

	return FALSE;
}