decss.cpp

有争议的DVD格式解密源程序,其作者正面临诉讼

// DeCSS.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include "resource.h"
#include <commctrl.h>
#include <shlobj.h>
#include "css/CSSkeysNT.h"
#include "css/CSSscramble.h"

#define MAX_LOADSTRING 100

// Global Variables:
HINSTANCE	g_hInst;							// current instance
int			iDrive;								// drive
BOOL		bKeyReceived;						// did we successfully get the key?
HWND		g_hWnd;								// main window
HWND		g_hWndDrives;						// list of cd-/dvdroms
HWND		g_hWndStatus;						// status window
HWND		g_hWndSector;						// sector
HWND		g_hWndFiles;						// files
HWND		g_hWndTransfer;						// transfer button
CHAR		g_szFolder[MAX_PATH];				// folder to place files
TCHAR		g_szTitle[] = "DeCSS by MoRE";		// The title bar text
TCHAR		g_szWindowClass[] = "DECSS";		// The title bar text

HANDLE		hTransferThread;

BYTE		diskkey[6];
BYTE		titlekey[6];

int __stdcall	WndProc(HWND, UINT, WPARAM, LPARAM);
int				TransferFile(LPVOID);

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{

	INITCOMMONCONTROLSEX	icc;
	
	g_hInst	= hInstance;

	icc.dwSize	= sizeof(icc);
	icc.dwICC	= ICC_LISTVIEW_CLASSES | ICC_TREEVIEW_CLASSES | ICC_BAR_CLASSES |
				ICC_TAB_CLASSES | ICC_UPDOWN_CLASS | ICC_PROGRESS_CLASS |
				ICC_HOTKEY_CLASS | ICC_ANIMATE_CLASS | ICC_WIN95_CLASSES |
				ICC_DATE_CLASSES | ICC_USEREX_CLASSES | ICC_COOL_CLASSES |
				ICC_INTERNET_CLASSES | ICC_PAGESCROLLER_CLASS | ICC_NATIVEFNTCTL_CLASS;
	InitCommonControlsEx(&icc);

	return(DialogBoxParam(g_hInst, MAKEINTRESOURCE(IDD_DECSS), 0, &WndProc, 0));

}

void AddFilesToComboBox(int iDrive)
{
	CHAR			szTemp[MAX_PATH];
	HANDLE			hSearch;
	COMBOBOXEXITEM	ci;
	WIN32_FIND_DATA	findData;
	
	wsprintf(szTemp, "%c:\\VIDEO_TS\\V*", iDrive);

	ci.mask			= CBEIF_TEXT;
	ci.iItem		= -1;
	ci.pszText		= findData.cFileName;

	SendMessage(g_hWndFiles, CB_RESETCONTENT, 0, 0);

	hSearch = FindFirstFile(szTemp, &findData);
	SendMessage(g_hWndFiles, CBEM_INSERTITEMA, 0, (LPARAM) &ci);

	while(FindNextFile(hSearch, &findData))
	{
		SendMessage(g_hWndFiles, CBEM_INSERTITEMA, 0, (LPARAM) &ci);
	}

}

void UpdateStatusWindow(LPSTR szString)
{
	char curText[2048];

	SendMessage(g_hWndStatus, WM_GETTEXT, 2048, (LPARAM) curText);
	strcat(curText, szString);
	strcat(curText, "\r\n");
	SendMessage(g_hWndStatus, WM_SETTEXT, 0, (LPARAM) curText);
	SendMessage(g_hWndStatus, EM_LINESCROLL, 0, SendMessage(g_hWndStatus, EM_GETLINECOUNT, 0, 0));
}

int __stdcall WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{

	COMBOBOXEXITEM	ci;

	CHAR			szVolume[MAX_PATH];
	CHAR			szTemp[MAX_PATH];
	HANDLE			hFile;
	TCHAR			szLastDrive[] = "C:\\";

	switch (message) 
	{
		case WM_INITDIALOG:
			g_hWndDrives = GetDlgItem(hWnd, IDC_DRIVES);
			g_hWndStatus = GetDlgItem(hWnd, IDC_STATUS);
			g_hWndSector = GetDlgItem(hWnd, IDC_SECTOR);
			g_hWndFiles = GetDlgItem(hWnd, IDC_FILES);
			g_hWndTransfer = GetDlgItem(hWnd, IDC_TRANSFER);

			ci.mask			= CBEIF_TEXT;
			ci.iItem			= -1;
			ci.pszText			= szTemp;
		
			for(szLastDrive[0] = 'C'; szLastDrive[0] != 'Z'; szLastDrive[0]++)
			{
				if(GetDriveType(szLastDrive) == DRIVE_CDROM)
				{
					szVolume[0] = 0;
					GetVolumeInformation(szLastDrive, szVolume, MAX_PATH, 0, 0, 0, 0, 0);
					wsprintf(szTemp, "%s [%s]", szLastDrive, szVolume);
					SendMessage(g_hWndDrives, CBEM_INSERTITEMA, 0, (LPARAM) &ci);

					wsprintf(szTemp, "%c:\\VIDEO_TS\\VIDEO_TS.IFO", szLastDrive[0]);

					hFile = CreateFile(szTemp, GENERIC_READ, FILE_SHARE_READ, 0, OPEN_EXISTING, 0, 0);
					if(hFile != INVALID_HANDLE_VALUE)
					{
						SendMessage(g_hWndDrives, CB_SETCURSEL, SendMessage(g_hWndDrives, CB_GETCOUNT, 0, 0) - 1, 0);
						CloseHandle(hFile);
					}
				}
			}

			SendMessage(g_hWndSector, WM_SETTEXT, 0, (LPARAM) "Enter Sector");

			return 0;
		case WM_COMMAND:
				switch(LOWORD(wParam))
				{
					case IDC_GETKEYS:
						{
							int lba = GetDlgItemInt(hWnd, IDC_SECTOR, 0, TRUE);
							int drive = SendMessage(g_hWndDrives, CB_GETCURSEL, 0, 0);
							SendMessage(g_hWndDrives, CB_GETLBTEXT, drive, (LPARAM) szTemp);
							iDrive = szTemp[0];

							bKeyReceived = FALSE;
						
							if(CSSgetdiskkey(iDrive, diskkey))
							{
								UpdateStatusWindow("Error getting disk key");
								break;
							}
						
							wsprintf(szTemp, "Disk Key: %02X%02X%02X%02X%02X", diskkey[0], diskkey[1], diskkey[2], diskkey[3], diskkey[4]);
							UpdateStatusWindow(szTemp);

							if(CSSgettitlekey(iDrive, lba, titlekey))
							{
								wsprintf(szTemp, "Error getting title key for LBA %08X", lba);
								UpdateStatusWindow(szTemp);
							}

							wsprintf(szTemp, "Title key: %02X%02X%02X%02X%02X", titlekey[0], titlekey[1], titlekey[2], titlekey[3], titlekey[4]);
							UpdateStatusWindow(szTemp);

							CSSdecrypttitlekey(titlekey, diskkey);

							wsprintf(szTemp, "Master key: %02X%02X%02X%02X%02X", titlekey[0], titlekey[1], titlekey[2], titlekey[3], titlekey[4]);
							UpdateStatusWindow(szTemp);

							bKeyReceived = TRUE;

							AddFilesToComboBox(iDrive);
						}
					break;

					case IDC_FOLDER:
						{
							BROWSEINFO bi;
							LPITEMIDLIST pidl;

							bi.hwndOwner = hWnd;
							bi.pidlRoot = NULL;
							bi.pszDisplayName = szTemp;
							bi.lpszTitle = "Locate folder where you want the files to be placed...";
							bi.ulFlags = BIF_RETURNONLYFSDIRS;
							bi.lpfn = NULL;
							bi.lParam = 0;	

							pidl = SHBrowseForFolder(&bi);
							
							if(!pidl)
							{
								MessageBox(hWnd, "You didn't locate a folder!\r\nPlease do so before trying to transfer.", "DeCSS (MoRE)", 0);
								break;
							}

							SHGetPathFromIDList(pidl, g_szFolder);

							int iLen = lstrlen(g_szFolder) - 1;
							if(g_szFolder[iLen] == '\\')
								g_szFolder[iLen] = 0;
						}
					break;

					case IDC_TRANSFER:
						{
							DWORD dwExitCode;
							GetExitCodeThread(hTransferThread, &dwExitCode);
							if(dwExitCode == STILL_ACTIVE)
							{
								hTransferThread = 0;
							}
							else
							{
								DWORD threadID;
								hTransferThread = CreateThread(0, 0, (LPTHREAD_START_ROUTINE) TransferFile, 0, 0, &threadID);
							}
						}
					break;

				}
			break;
		case WM_CLOSE:
			EndDialog(hWnd, 0);
		case WM_DESTROY:
			PostQuitMessage(0);
			break;
   }
   return 0;
}

int TransferFile(LPVOID Param)
{
	HANDLE		in, out;
	ULONGLONG	pos = 0;
	BYTE		buf[0x800];
	DWORD		sec = 0, esec = 0, r, w;
	CHAR		szDecryptFile[MAX_PATH];
	CHAR		szOutputFile[MAX_PATH];
	CHAR		szBuffer[MAX_PATH];
	CHAR		szCurText[2048];
	CHAR		szBytes[MAX_PATH];
	int			iLen;

	if(bKeyReceived == FALSE)
	{
		MessageBox(g_hWnd, "Master key has not been retrieved!", "DeCSS (MoRE)", 0);
		return 0;
	}

	if(g_szFolder[0] == 0)
	{
		MessageBox(g_hWnd, "Please locate a folder before transferring.", "DeCSS (MoRE)", 0);
		return 0;
	}

	SendMessage(g_hWndFiles, CB_GETLBTEXT, SendMessage(g_hWndFiles, CB_GETCURSEL, 0, 0), (LPARAM) szBuffer);
	wsprintf(szDecryptFile, "%c:\\VIDEO_TS\\%s", iDrive, szBuffer);
	wsprintf(szOutputFile, "%s\\%s", g_szFolder, szBuffer);
	
	iLen = lstrlen(szBuffer) - 1;
	if(szBuffer[iLen - 2] != 'V' && szBuffer[iLen - 1] != 'O' && szBuffer[iLen] != 'B')
	{
		CopyFile(szDecryptFile, szOutputFile, FALSE);
		wsprintf(szDecryptFile, "%s was copied", szBuffer);
		UpdateStatusWindow(szDecryptFile);
		hTransferThread = 0;
		return TRUE;
	}

	in = CreateFile(szDecryptFile, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
	if(in == INVALID_HANDLE_VALUE)
	{
		wsprintf(szOutputFile, "Unable to open %s for reading", szBuffer);
		UpdateStatusWindow(szOutputFile);
		return 0;
	}

	out = CreateFile(szOutputFile, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, 0, NULL);
	if(out==INVALID_HANDLE_VALUE)
	{
		wsprintf(szDecryptFile, "Unable to open %s for writing", szOutputFile);
		UpdateStatusWindow(szDecryptFile);
		CloseHandle(in);
		return 0;
	}

	SendMessage(g_hWndStatus, WM_GETTEXT, 2048, (LPARAM) szCurText);
	SendMessage(g_hWndTransfer, WM_SETTEXT, 0, (LPARAM) "Abort");

	do
	{
		ReadFile(in, buf, 0x800, &r, NULL);
		if(r != 0x800)
			break;
		sec++;
		if(buf[0x14]&0x30)
		{
			esec++;
			CSSdescramble(buf, titlekey);
			buf[0x14] &= 0xcf;
		}
		
		WriteFile(out, buf, 0x800, &w, NULL);
		if(w != 0x800)
		{
			wsprintf(szBuffer, "Error writing to %s", szOutputFile);
			UpdateStatusWindow(szBuffer);
			break;
		}
		if(!(pos & 0xfffff))
		{
			lstrcpy(szBuffer, szCurText);
			wsprintf(szBytes, "%u bytes transferred", pos);
			strcat(szBuffer, szBytes);
			strcat(szBuffer, "\r\n");
			SendMessage(g_hWndStatus, WM_SETTEXT, 0, (LPARAM) szBuffer);
			SendMessage(g_hWndStatus, EM_LINESCROLL, 0, SendMessage(g_hWndStatus, EM_GETLINECOUNT, 0, 0));
		}
			
		pos += 0x800;

	} while(r == 0x800 && hTransferThread);

	if(!hTransferThread)
		UpdateStatusWindow("Decryption aborted by user");

	wsprintf(szBuffer, "Decrypted %u/%u sectors", esec, sec);
	UpdateStatusWindow(szBuffer);

	CloseHandle(in);
	CloseHandle(out);

	SendMessage(g_hWndTransfer, WM_SETTEXT, 0, (LPARAM) "Transfer");

	return TRUE;

}