/*
 * $Id: MiniDump.cpp 753 2008-08-24 14:17:18Z casimir666 $
 *
 * (C) 2006-2007 see AUTHORS
 *
 * This file is part of mplayerc.
 *
 * Mplayerc is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * Mplayerc is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "StdAfx.h"
#include "resource.h"
#include "DbgHelp.h"

#include "Version.h"
#include "UserConfig.h"

class CMiniDump
{
public:
	CMiniDump();

private :
	static LONG WINAPI		UnhandledExceptionFilter(_EXCEPTION_POINTERS *lpTopLevelExceptionFilter);
	static BOOL				PreventSetUnhandledExceptionFilter();
};

#ifdef ENABLE_MINIDUMP
CMiniDump	_Singleton;
#endif


typedef BOOL (WINAPI *MINIDUMPWRITEDUMP)(HANDLE hProcess, DWORD dwPid, HANDLE hFile, MINIDUMP_TYPE DumpType,
									CONST PMINIDUMP_EXCEPTION_INFORMATION ExceptionParam,
									CONST PMINIDUMP_USER_STREAM_INFORMATION UserStreamParam,
									CONST PMINIDUMP_CALLBACK_INFORMATION CallbackParam
									);


CMiniDump::CMiniDump ()
{
#ifndef _DEBUG
	SetUnhandledExceptionFilter (UnhandledExceptionFilter);
	
#ifndef _WIN64
	// Enable catching in CRT (http://blog.kalmbachnet.de/?postid=75)
	PreventSetUnhandledExceptionFilter();
#endif
#endif
}

LPTOP_LEVEL_EXCEPTION_FILTER WINAPI MyDummySetUnhandledExceptionFilter(LPTOP_LEVEL_EXCEPTION_FILTER lpTopLevelExceptionFilter)
{
	return NULL;
}


BOOL CMiniDump::PreventSetUnhandledExceptionFilter()
{
	HMODULE hKernel32 = LoadLibrary(_T("kernel32.dll"));
	if (hKernel32 == NULL) return FALSE;
	void *pOrgEntry = GetProcAddress(hKernel32, "SetUnhandledExceptionFilter");
	if(pOrgEntry == NULL) return FALSE;
	unsigned char newJump[ 100 ];
	DWORD dwOrgEntryAddr = (DWORD) pOrgEntry;
	dwOrgEntryAddr += 5; // add 5 for 5 op-codes for jmp far
	void *pNewFunc = &MyDummySetUnhandledExceptionFilter;
	DWORD dwNewEntryAddr = (DWORD) pNewFunc;
	DWORD dwRelativeAddr = dwNewEntryAddr - dwOrgEntryAddr;

	newJump[ 0 ] = 0xE9;  // JMP absolute
	memcpy(&newJump[ 1 ], &dwRelativeAddr, sizeof(pNewFunc));
	SIZE_T bytesWritten;
	BOOL bRet = WriteProcessMemory(GetCurrentProcess(),
	pOrgEntry, newJump, sizeof(pNewFunc) + 1, &bytesWritten);
	return bRet;
}


LONG WINAPI CMiniDump::UnhandledExceptionFilter(_EXCEPTION_POINTERS *lpTopLevelExceptionFilter)
{
	LONG		retval		= EXCEPTION_CONTINUE_SEARCH;
	HWND		hParent		= NULL;
	HMODULE		hDll		= NULL;
	TCHAR		szResult[800];
	TCHAR		szDbgHelpPath[_MAX_PATH];

	// firstly see if dbghelp.dll is around and has the function we need
	// look next to the EXE first, as the one in System32 might be old 
	// (e.g. Windows 2000)

	if (GetModuleFileName( NULL, szDbgHelpPath, _MAX_PATH ))
	{
		TCHAR *pSlash = _tcsrchr( szDbgHelpPath, _T('\\') );
		if (pSlash)
		{
			_tcscpy_s( pSlash+1, _MAX_PATH+szDbgHelpPath-pSlash, _T("DBGHELP.DLL") );
			hDll = ::LoadLibrary( szDbgHelpPath );
		}
	}

	if (hDll==NULL)
	{
		// load any version we can
		hDll = ::LoadLibrary(_T("DBGHELP.DLL"));
	}

	if (hDll)
	{
		MINIDUMPWRITEDUMP pDump = (MINIDUMPWRITEDUMP)::GetProcAddress( hDll, "MiniDumpWriteDump" );
		if (pDump)
		{
			TCHAR szDumpPath[_MAX_PATH];
			TCHAR szVersion[40];

			GetModuleFileName (NULL, szDumpPath, _MAX_PATH);
			_stprintf_s (szVersion, countof(szVersion), _T(".%d.%d.%d.%d"), VERSION_MAJOR, VERSION_MINOR, VERSION_REV, VERSION_PATCH);
			_tcscat_s( szDumpPath, _MAX_PATH, szVersion );
			_tcscat_s( szDumpPath, _MAX_PATH, _T(".dmp") );

			// create the file
			HANDLE hFile = ::CreateFile( szDumpPath, GENERIC_WRITE, FILE_SHARE_WRITE, NULL, CREATE_ALWAYS,
										FILE_ATTRIBUTE_NORMAL, NULL );

			if (hFile!=INVALID_HANDLE_VALUE)
			{
				_MINIDUMP_EXCEPTION_INFORMATION ExInfo;

				ExInfo.ThreadId = ::GetCurrentThreadId();
				ExInfo.ExceptionPointers = lpTopLevelExceptionFilter;
				ExInfo.ClientPointers = NULL;

				// write the dump
				BOOL bOK = pDump( GetCurrentProcess(), GetCurrentProcessId(), hFile, MiniDumpNormal, &ExInfo, NULL, NULL );
				if (bOK)
				{
					_stprintf_s(szResult, countof(szResult), ResStr(IDS_MPC_CRASH), szDumpPath );
					retval = EXCEPTION_EXECUTE_HANDLER;
				}
				else
				{
					_stprintf_s(szResult, countof(szResult), ResStr(IDS_MPC_MINIDUMP_FAIL), szDumpPath, GetLastError() );
				}
				::CloseHandle(hFile);
			}
			else
			{
				_stprintf_s(szResult, countof(szResult), ResStr(IDS_MPC_MINIDUMP_FAIL), szDumpPath, GetLastError() );
			}
		}
	}

	if (szResult)
		MessageBox (NULL, szResult, _T("MPC-HC Mini Dump"), MB_OK);

	return retval;
}
