gzdoom/src/win32/i_crash.cpp

/*
** i_crash.cpp
** Gathers exception information when the program crashes.
**
**---------------------------------------------------------------------------
** Copyright 2002-2005 Randy Heit
** All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** 1. Redistributions of source code must retain the above copyright
**    notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
**    notice, this list of conditions and the following disclaimer in the
**    documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
**    derived from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.s
** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**---------------------------------------------------------------------------
**
*/

#define WIN32_LEAN_AND_MEAN
#define _WIN32_WINNT 0x0501
#include <windows.h>
#include <winnt.h>
#include <richedit.h>
#include <winuser.h>
#include <tlhelp32.h>
#include <dbghelp.h>
#include <commctrl.h>
#include <commdlg.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <setupapi.h>
#include <uxtheme.h>
#include <shellapi.h>
#include <uxtheme.h>
#include <stddef.h>
#include "resource.h"
#include "version.h"

#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <time.h>
#include <zlib.h>

// Damn Microsoft for doing Get/SetWindowLongPtr half-assed. Instead of
// giving them proper prototypes under Win32, they are just macros for
// Get/SetWindowLong, meaning they take LONGs and not LONG_PTRs.
#ifdef _WIN64
typedef LONG_PTR WLONG_PTR;
#else
typedef LONG WLONG_PTR;
#endif

HRESULT (__stdcall *pEnableThemeDialogTexture) (HWND hwnd, DWORD dwFlags);

#define BUGS_FORUM_URL	"http://forum.zdoom.org/index.php?c=3"

#define REMOTE_HOST		"localhost"
#define REMOTE_PORT		"80"
#define UPLOAD_URI		"/test.php"
#define UPLOAD_BOUNDARY	"Von-DnrNbJl0 P9d_BD;cEEsQVWpYMq0pbZ6NUmYHus;yIbFbkgB?.N=YC5O=BGZm+Rab5"
#define DBGHELP_URI		"/msredist/dbghelp.dl_"

// If you are working on your own modified version of ZDoom, change
// the last part of the UPLOAD_AGENT (between parentheses) to your
// own program's name. e.g. (Skulltag) or (ZDaemon) or (ZDoomFu)
#define UPLOAD_AGENT	"ZDoom/" DOTVERSIONSTR " (ZDoom the Original)"

// Time, in milliseconds, to wait for a send() or recv() to complete.
#define TIMEOUT			60000

static const char PostHeader[] =
"POST " UPLOAD_URI " HTTP/1.1\r\n"
"Host: " REMOTE_HOST "\r\n"
"Connection: Close\r\n"
"User-Agent: " UPLOAD_AGENT "\r\n"
"Expect: 100-continue\r\n"
"Content-Type: multipart/form-data; boundary=\"" UPLOAD_BOUNDARY "\"\r\n"
"Content-Length: %lu\r\n"
"\r\n";

static const char MultipartInfoHeader[] =
"\r\n--" UPLOAD_BOUNDARY "\r\n"
"Content-Transfer-Encoding: 7bit\r\n"
"Content-Disposition: form-data; name=\"Info\"\r\n"
"\r\n";

static const char MultipartUserSummaryHeader[] =
"\r\n--" UPLOAD_BOUNDARY "\r\n"
"Content-Transfer-Encoding: 8bit\r\n"
"Content-Disposition: form-data; name=\"UserSummary\"\r\n"
"\r\n";

static const char MultipartBinaryHeader[] =
"\r\n--" UPLOAD_BOUNDARY "\r\n"
"Content-Transfer-Encoding: binary\r\n"
"Content-Disposition: form-data; name=\"reportfile\"; filename=\"itdidcrash.tar";

static const char MultipartHeaderGZip[] =
".gz\"\r\n"
"Content-Type: application/x-tar-gz\r\n"
"\r\n";

static const char MultipartHeaderNoGZip[] =
"\"\r\n"
"Content-Type: application/x-tar\r\n"
"\r\n";

static const char MultipartFooter[] =
"\r\n--" UPLOAD_BOUNDARY "--\r\n\r\n";

static const char DbgHelpRequest[] =
"GET " DBGHELP_URI " HTTP/1.1\r\n"
"Host: " REMOTE_HOST "\r\n"
"Connection: Close\r\n"
"User-Agent: " UPLOAD_AGENT "\r\n"
"\r\n";


namespace tar
{
	/*
	* Standard Archive Format - Standard TAR - USTAR
	*/
	enum
	{
		RECORDSIZE =	512,
		NAMSIZE	=		100,
		TUNMLEN =		32,
		TGNMLEN =		32
	};

	union record {
		unsigned char charptr[RECORDSIZE];
		struct {
			char	name[NAMSIZE];
			char	mode[8];
			char	uid[8];
			char	gid[8];
			char	size[12];
			char	mtime[12];
			char	chksum[8];
			char	linkflag;
			char	linkname[NAMSIZE];
			char	magic[8];
			char	uname[TUNMLEN];
			char	gname[TGNMLEN];
			char	devmajor[8];
			char	devminor[8];
		} header;
	};
}

#define MAX_FILES 5

struct TarFile
{
	HANDLE File;
	const char *Filename;
};
static TarFile TarFiles[MAX_FILES];
static int NumFiles;

static void AddFile (HANDLE file, const char *filename);
static void CloseTarFiles ();
static HANDLE MakeTar (bool &gzip);
static HANDLE CreateTempFile ();

typedef BOOL (WINAPI *THREADWALK) (HANDLE, LPTHREADENTRY32);
typedef BOOL (WINAPI *MODULEWALK) (HANDLE, LPMODULEENTRY32);
typedef HANDLE (WINAPI *CREATESNAPSHOT) (DWORD, DWORD);
typedef BOOL (WINAPI *WRITEDUMP) (HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
								  PMINIDUMP_EXCEPTION_INFORMATION,
								  PMINIDUMP_USER_STREAM_INFORMATION,
								  PMINIDUMP_CALLBACK_INFORMATION);

extern HINSTANCE g_hInst;

EXCEPTION_POINTERS CrashPointers;
EXCEPTION_RECORD MyExceptionRecord;
CONTEXT MyContextRecord;

static HANDLE DbgProcess;
static DWORD DbgProcessID;
static DWORD DbgThreadID;
static DWORD CrashCode;
static PVOID CrashAddress;
static bool NeedDbgHelp;
static char CrashSummary[256];

static void DumpBytes (HANDLE file, BYTE *address);
static void AddStackInfo (HANDLE file, void *dumpaddress);
static void StackWalk (HANDLE file, void *dumpaddress, DWORD *topOfStack);
static void AddToolHelp (HANDLE file);

static HANDLE WriteTextReport ();

static INT_PTR CALLBACK DetailsDlgProc (HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam);
static void SetEditControl (HWND control, HWND sizedisplay, int filenum);

static BOOL UploadReport (HANDLE report, bool gziped);

//==========================================================================
//
// GetTopOfStack
//
// Given a pointer to some address on the stack, returns a pointer to
// the top of the stack.
//
//==========================================================================

DWORD *GetTopOfStack (void *top)
{
	MEMORY_BASIC_INFORMATION memInfo;

	if (VirtualQuery (top, &memInfo, sizeof(memInfo)))
	{
		return (DWORD *)((BYTE *)memInfo.BaseAddress + memInfo.RegionSize);
	}
	else
	{
		return NULL;
	}
}

//==========================================================================
//
// WriteMyMiniDump
//
// Writes a minidump if dbghelp.dll is present and adds it to the tarball.
// Otherwise, it just returns INVALID_HANDLE_VALUE.
//
//==========================================================================

static HANDLE WriteMyMiniDump (void)
{
	MINIDUMP_EXCEPTION_INFORMATION exceptor = { DbgThreadID, &CrashPointers, FALSE };
	char dbghelpPath[MAX_PATH+12], *bs;
	WRITEDUMP pMiniDumpWriteDump;
	HANDLE file;
	BOOL good = FALSE;
	HMODULE dbghelp = NULL;

	// Make sure dbghelp.dll and MiniDumpWriteDump are available
	// Try loading from the application directory first, then from the search path.
	GetModuleFileName (NULL, dbghelpPath, MAX_PATH);
	dbghelpPath[MAX_PATH] = 0;
	bs = strrchr (dbghelpPath, '\\');
	if (bs != NULL)
	{
		strcpy (bs + 1, "dbghelp.dll");
		dbghelp = LoadLibrary (dbghelpPath);
	}
	if (dbghelp == NULL)
	{
		dbghelp = LoadLibrary ("dbghelp.dll");
		if (dbghelp == NULL)
		{
			NeedDbgHelp = true;
			return INVALID_HANDLE_VALUE;
		}
	}
	pMiniDumpWriteDump = (WRITEDUMP)GetProcAddress (dbghelp, "MiniDumpWriteDump");
	if (pMiniDumpWriteDump != NULL)
	{
		file = CreateTempFile ();
		if (file != INVALID_HANDLE_VALUE)
		{
			good = pMiniDumpWriteDump (DbgProcess, DbgProcessID, file,
				MiniDumpNormal, &exceptor, NULL, NULL);
		}
	}
	else
	{
		NeedDbgHelp = true;
	}
	return good ? file : INVALID_HANDLE_VALUE;
}

//==========================================================================
//
// Writef
//
// Like printf, but for Win32 file HANDLEs.
//
//==========================================================================

void __cdecl Writef (HANDLE file, const char *format, ...)
{
	char buffer[1024];
	va_list args;
	DWORD len;

	va_start (args, format);
	len = vsprintf (buffer, format, args);
	va_end (args);
	WriteFile (file, buffer, len, &len, NULL);
}

//==========================================================================
//
// CreateCrashLog
//
// Creates all the files needed for a crash report.
//
//==========================================================================

void CreateCrashLog (HANDLE process, DWORD processID, DWORD threadID, LPEXCEPTION_POINTERS exceptionRecord, char *custominfo, DWORD customsize)
{
	// Do not collect information more than once.
	if (NumFiles != 0)
	{
		return;
	}

	DbgThreadID = threadID;
	DbgProcessID = processID;
	DbgProcess = process;
	if (!ReadProcessMemory (DbgProcess, exceptionRecord, &CrashPointers, sizeof(CrashPointers), NULL) ||
		!ReadProcessMemory (DbgProcess, CrashPointers.ExceptionRecord, &MyExceptionRecord, sizeof(EXCEPTION_RECORD), NULL) ||
		!ReadProcessMemory (DbgProcess, CrashPointers.ContextRecord, &MyContextRecord, sizeof(CONTEXT), NULL))
	{
		HANDLE file = CreateTempFile();

		Writef (file, "Could not read process memory\n");
		AddFile (file, "failed.txt");
	}
	else
	{
		CrashPointers.ExceptionRecord = &MyExceptionRecord;
		CrashPointers.ContextRecord = &MyContextRecord;
		CrashCode = CrashPointers.ExceptionRecord->ExceptionCode;
		CrashAddress = CrashPointers.ExceptionRecord->ExceptionAddress;

		AddFile (WriteTextReport(), "report.txt");
		AddFile (WriteMyMiniDump(), "minidump.mdmp");

		// Copy app-specific information out of the crashing process's memory
		// and into a new temporary file.
		if (customsize != 0)
		{
			HANDLE file = CreateTempFile();
			DWORD wrote;

			if (file != INVALID_HANDLE_VALUE)
			{
				BYTE buffer[512];
				DWORD left;

				for (;; customsize -= left, custominfo += left)
				{
					left = customsize > 512 ? 512 : customsize;
					if (left == 0)
					{
						break;
					}
					if (ReadProcessMemory (DbgProcess, custominfo, buffer, left, NULL))
					{
						WriteFile (file, buffer, left, &wrote, NULL);
					}
					else
					{
						Writef (file, "Failed reading remaining %lu bytes\r\n", customsize);
						break;
					}
				}
				AddFile (file, "local.txt");
			}
		}
	}
	CloseHandle (DbgProcess);
}

//==========================================================================
//
// WriteTextReport
//
// This is the classic plain-text report ZDoom has generated since it
// added crash gathering abilities in 2002.
//
//==========================================================================

HANDLE WriteTextReport ()
{
	HANDLE file;

	static const struct
	{
		DWORD Code; const char *Text;
	}
	exceptions[] =
	{
		{ EXCEPTION_ACCESS_VIOLATION, "Access Violation" },
		{ EXCEPTION_ARRAY_BOUNDS_EXCEEDED, "Array Bounds Exceeded" },
		{ EXCEPTION_BREAKPOINT, "Breakpoint" },
		{ EXCEPTION_DATATYPE_MISALIGNMENT, "Data Type Misalignment" },
		{ EXCEPTION_FLT_DENORMAL_OPERAND, "Float: Denormal Operand." },
		{ EXCEPTION_FLT_DIVIDE_BY_ZERO, "Float: Divide By Zero" },
		{ EXCEPTION_FLT_INEXACT_RESULT, "Float: Inexact Result" },
		{ EXCEPTION_FLT_INVALID_OPERATION, "Float: Invalid Operation" },
		{ EXCEPTION_FLT_OVERFLOW, "Float: Overflow" },
		{ EXCEPTION_FLT_STACK_CHECK, "Float: Stack Check" },
		{ EXCEPTION_FLT_UNDERFLOW, "Float: Underflow" },
		{ EXCEPTION_ILLEGAL_INSTRUCTION, "Illegal Instruction" },
		{ EXCEPTION_IN_PAGE_ERROR, "In Page Error" },
		{ EXCEPTION_INT_DIVIDE_BY_ZERO, "Int: Divide By Zero" },
		{ EXCEPTION_INT_OVERFLOW, "Int: Overflow" },
		{ EXCEPTION_INVALID_DISPOSITION, "Invalid Disposition" },
		{ EXCEPTION_NONCONTINUABLE_EXCEPTION, "Noncontinuable Exception" },
		{ EXCEPTION_PRIV_INSTRUCTION, "Priviledged Instruction" },
		{ EXCEPTION_SINGLE_STEP, "Single Step" },
		{ EXCEPTION_STACK_OVERFLOW, "Stack Overflow" }
	};
	static const char eflagsBits[][2] =
	{
		{ 'C','F' },	// Carry Flag
		{ 'x','1' },	// Always one
		{ 'P','F' },	// Parity Flag
		{ 'x','0' },	// Always zero
		{ 'A','F' },	// Auxilliary Carry Flag
		{ 'x','0' },	// Always zero
		{ 'Z','F' },	// Zero Flag
		{ 'S','F' },	// Sign Flag
		{ 'T','F' },	// Trap Flag
		{ 'I','F' },	// Interrupt Enable Flag
		{ 'D','F' },	// Direction Flag
		{ 'O','F' },	// Overflow Flag
		{ 'x','x' },	// IOPL low bit
		{ 'x','x' },	// IOPL high bit
		{ 'N','T' },	// Nested Task
		{ 'x','0' },	// Always zero
		{ 'R','F' },	// Resume Flag
		{ 'V','M' },	// Virtual-8086 Mode
		{ 'A','C' },	// Alignment Check
		{ 'V','I' },	// Virtual Interrupt Flag
		{ 'V','P' }		// Virtual Interrupt Pending
	};


	int i, j;

	file = CreateTempFile ();
	if (file == INVALID_HANDLE_VALUE)
	{
		return file;
	}

	OSVERSIONINFO verinfo = { sizeof(verinfo) };
	GetVersionEx (&verinfo);

	for (i = 0; (size_t)i < sizeof(exceptions)/sizeof(exceptions[0]); ++i)
	{
		if (exceptions[i].Code == CrashPointers.ExceptionRecord->ExceptionCode)
		{
			break;
		}
	}
	j = sprintf (CrashSummary, "Code: %08lX", CrashPointers.ExceptionRecord->ExceptionCode);
	if ((size_t)i < sizeof(exceptions)/sizeof(exceptions[0]))
	{
		j += sprintf (CrashSummary + j, " (%s", exceptions[i].Text);
		if (CrashPointers.ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION)
		{
			// Pre-NT kernels do not seem to provide this information.
			if (verinfo.dwPlatformId != VER_PLATFORM_WIN32_WINDOWS)
			{
				j += sprintf (CrashSummary + j, " - tried to %s address %08lX",
					CrashPointers.ExceptionRecord->ExceptionInformation[0] ? "write" : "read",
					CrashPointers.ExceptionRecord->ExceptionInformation[1]);
			}
		}
		CrashSummary[j++] = ')';
	}
	j += sprintf (CrashSummary + j, "\r\nAddress: %p", CrashPointers.ExceptionRecord->ExceptionAddress);
	Writef (file, "%s\r\nFlags: %08X\r\n\r\n", CrashSummary, CrashPointers.ExceptionRecord->ExceptionFlags);

	Writef (file, "Windows %s %d.%d Build %d %s\r\n\r\n",
		verinfo.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS ? "9x" : "NT",
		verinfo.dwMajorVersion, verinfo.dwMinorVersion, verinfo.dwBuildNumber, verinfo.szCSDVersion);

	CONTEXT *ctxt = CrashPointers.ContextRecord;

	if (ctxt->ContextFlags & CONTEXT_SEGMENTS)
	{
		Writef (file, "GS=%04x  FS=%04x  ES=%04x  DS=%04x\r\n",
			ctxt->SegGs, ctxt->SegFs, ctxt->SegEs, ctxt->SegDs);
	}

	if (ctxt->ContextFlags & CONTEXT_INTEGER)
	{
		Writef (file, "EAX=%08x  EBX=%08x  ECX=%08x  EDX=%08x\r\nESI=%08x  EDI=%08x\r\n",
			ctxt->Eax, ctxt->Ebx, ctxt->Ecx, ctxt->Edx, ctxt->Esi, ctxt->Edi);
	}

	if (ctxt->ContextFlags & CONTEXT_CONTROL)
	{
		Writef (file, "EBP=%08x  EIP=%08x  ESP=%08x  CS=%04x  SS=%04x\r\nEFlags=%08x\r\n",
			ctxt->Ebp, ctxt->Eip, ctxt->Esp, ctxt->SegCs, ctxt->SegSs, ctxt->EFlags);

		DWORD j;

		for (i = 0, j = 1; (size_t)i < sizeof(eflagsBits)/sizeof(eflagsBits[0]); j <<= 1, ++i)
		{
			if (eflagsBits[i][0] != 'x')
			{
				Writef (file, " %c%c%c", eflagsBits[i][0], eflagsBits[i][1],
					ctxt->EFlags & j ? '+' : '-');
			}
		}
		Writef (file, "\r\n");
	}

	if (ctxt->ContextFlags & CONTEXT_FLOATING_POINT)
	{
		Writef (file,
			"\r\nFPU State:\r\n ControlWord=%04x StatusWord=%04x TagWord=%04x\r\n"
			" ErrorOffset=%08x\r\n ErrorSelector=%08x\r\n DataOffset=%08x\r\n DataSelector=%08x\r\n"
			" Cr0NpxState=%08x\r\n\r\n",
			(WORD)ctxt->FloatSave.ControlWord, (WORD)ctxt->FloatSave.StatusWord, (WORD)ctxt->FloatSave.TagWord,
			ctxt->FloatSave.ErrorOffset, ctxt->FloatSave.ErrorSelector, ctxt->FloatSave.DataOffset,
			ctxt->FloatSave.DataSelector, ctxt->FloatSave.Cr0NpxState);

		for (i = 0; i < 8; ++i)
		{
			Writef (file, "MM%d=%08x%08x\r\n", i, *(DWORD *)(&ctxt->FloatSave.RegisterArea[20*i+4]),
				*(DWORD *)(&ctxt->FloatSave.RegisterArea[20*i]));
		}
	}

	AddToolHelp (file);

	Writef (file, "\r\nBytes near EIP:");
	DumpBytes (file, (BYTE *)CrashPointers.ExceptionRecord->ExceptionAddress-16);

	if (ctxt->ContextFlags & CONTEXT_CONTROL)
	{
		AddStackInfo (file, (void *)(size_t)CrashPointers.ContextRecord->Esp);
	}

	return file;
}

//==========================================================================
//
// AddToolHelp
//
// Adds the information supplied by the tool help functions to the text
// report. This includes the list of threads for this process and the
// loaded modules.
//
//==========================================================================

static void AddToolHelp (HANDLE file)
{
	HMODULE kernel = GetModuleHandle ("kernel32.dll");
	if (kernel == NULL)
		return;

	CREATESNAPSHOT pCreateToolhelp32Snapshot;
	THREADWALK pThread32First;
	THREADWALK pThread32Next;
	MODULEWALK pModule32First;
	MODULEWALK pModule32Next;

	pCreateToolhelp32Snapshot = (CREATESNAPSHOT)GetProcAddress (kernel, "CreateToolhelp32Snapshot");
	pThread32First = (THREADWALK)GetProcAddress (kernel, "Thread32First");
	pThread32Next = (THREADWALK)GetProcAddress (kernel, "Thread32Next");
	pModule32First = (MODULEWALK)GetProcAddress (kernel, "Module32First");
	pModule32Next = (MODULEWALK)GetProcAddress (kernel, "Module32Next");

	if (!(pCreateToolhelp32Snapshot && pThread32First && pThread32Next &&
		  pModule32First && pModule32Next))
	{
		Writef (file, "\r\nTool Help unavailable\r\n");
		return;
	}

	HANDLE snapshot = pCreateToolhelp32Snapshot (TH32CS_SNAPMODULE|TH32CS_SNAPTHREAD, 0);
	if (snapshot == INVALID_HANDLE_VALUE)
	{
		Writef (file, "\r\nTool Help snapshot unavailable\r\n");
		return;
	}

	THREADENTRY32 thread = { sizeof(thread) };

	Writef (file, "\r\nRunning threads:\r\n");

	if (pThread32First (snapshot, &thread))
	{
		do
		{
			if (thread.th32OwnerProcessID == DbgProcessID)
			{
				Writef (file, "%08x", thread.th32ThreadID);

				if (thread.th32ThreadID == DbgThreadID)
				{
					Writef (file, " at %08x*", CrashAddress);
				}
				Writef (file, "\r\n");
			}
		} while (pThread32Next (snapshot, &thread));
	}

	MODULEENTRY32 module = { sizeof(module) };

	Writef (file, "\r\nLoaded modules:\r\n");

	if (pModule32First (snapshot, &module))
	{
		do
		{
			Writef (file, "%08x - %08x %c%s\r\n",
				module.modBaseAddr, module.modBaseAddr + module.modBaseSize - 1,
				module.modBaseAddr <= CrashPointers.ExceptionRecord->ExceptionAddress &&
				module.modBaseAddr + module.modBaseSize > CrashPointers.ExceptionRecord->ExceptionAddress
				? '*' : ' ',
				module.szModule);
		} while (pModule32Next (snapshot, &module));
	}

	CloseHandle (snapshot);
}

//==========================================================================
//
// AddStackInfo
//
// Writes a stack dump to the text report.
//
//==========================================================================

static void AddStackInfo (HANDLE file, void *dumpaddress)
{
	DWORD *addr = (DWORD *)dumpaddress;
	DWORD *topOfStack = GetTopOfStack (dumpaddress);
	BYTE peekb;
	DWORD peekd;

	StackWalk (file, dumpaddress, topOfStack);

	Writef (file, "\r\nStack Contents:\r\n");
	DWORD *scan;
	for (scan = addr; scan < topOfStack; scan += 4)
	{
		int i;
		ptrdiff_t max;

		if (topOfStack - scan < 4)
		{
			max = topOfStack - scan;
		}
		else
		{
			max = 4;
		}

		Writef (file, "%p:", scan);
		for (i = 0; i < max; ++i)
		{
			if (!ReadProcessMemory (DbgProcess, &scan[i], &peekd, 4, NULL))
			{
				break;
			}
			Writef (file, " %08x", peekd);
		}
		for (; i < 4; ++i)
		{
			Writef (file, "         ");
		}
		Writef (file, "  ");
		for (i = 0; i < max*4; ++i)
		{
			if (!ReadProcessMemory (DbgProcess, (BYTE *)scan + i, &peekb, 1, NULL))
			{
				break;
			}
			Writef (file, "%c", peekb >= 0x20 && peekb <= 0x7f ? peekb : '\xb7');
		}
		Writef (file, "\r\n");
	}
}

//==========================================================================
//
// StackWalk
//
// Lists a possible call trace for the crashing thread to the text report.
// This is not very specific and just lists any pointers into the
// main executable region, whether they are part of the real trace or not.
//
//==========================================================================

static void StackWalk (HANDLE file, void *dumpaddress, DWORD *topOfStack)
{
	DWORD *addr = (DWORD *)dumpaddress;

	BYTE *pBaseOfImage = (BYTE *)GetModuleHandle (0);
	IMAGE_OPTIONAL_HEADER *pHeader = (IMAGE_OPTIONAL_HEADER *)(pBaseOfImage +
		((IMAGE_DOS_HEADER*)pBaseOfImage)->e_lfanew +
		sizeof(IMAGE_NT_SIGNATURE) + sizeof(IMAGE_FILE_HEADER));

	DWORD_PTR codeStart = (DWORD_PTR)pBaseOfImage + pHeader->BaseOfCode;
	DWORD_PTR codeEnd = codeStart + pHeader->SizeOfCode;

	Writef (file, "\r\nPossible call trace:\r\n %08x  BOOM", CrashAddress);
	for (DWORD_PTR *scan = addr; scan < topOfStack; ++scan)
	{
		DWORD_PTR code;

		if (ReadProcessMemory (DbgProcess, scan, &code, sizeof(code), NULL) &&
			code >= codeStart && code < codeEnd)
		{
			static const char regNames[][4] =
			{
				"eax", "ecx", "edx", "ebx", "esp", "ebp", "esi", "edi"
			};

			// Check if address is after a call statement. Print what was called if it is.
			const BYTE *bytep = (BYTE *)code;
			BYTE peekb;

#define chkbyte(x,m,v) ReadProcessMemory(DbgProcess, x, &peekb, 1, NULL) && ((peekb & m) == v)

			if (chkbyte(bytep - 5, 0xFF, 0xE8) || chkbyte(bytep - 5, 0xFF, 0xE9))
			{
				DWORD peekd;
				if (ReadProcessMemory (DbgProcess, bytep - 4, &peekd, 4, NULL))
				{
					DWORD_PTR jumpaddr = peekd + code;
					Writef (file, "\r\n %p  %s %p", code - 5,
						peekb == 0xE9 ? "jmp " : "call", jumpaddr);
					if (chkbyte((LPCVOID)jumpaddr, 0xFF, 0xE9) &&
						ReadProcessMemory (DbgProcess, (LPCVOID)(jumpaddr + 1), &peekd, 4, NULL))
					{
						Writef (file," => jmp  %p", peekd + jumpaddr + 5);
					}
				}
				else
				{
					Writef (file, "\r\n %p  %s ????????", code - 5,
						peekb == 0xE9 ? "jmp " : "call");
				}
			}
			else if (chkbyte(bytep - 2, 0xFF, 0xFF) && chkbyte(bytep - 1, 0xF7, 0xD0))
			{
				Writef (file, "\r\n %p  call %s", code - 2, regNames[peekb & 7]);
			}
			else
			{
				int i;

				for (i = 2; i < 7; ++i)
				{
					if (chkbyte(bytep - i, 0xFF, 0xFF) && chkbyte(bytep - i + 1, 070, 020))
					{
						break;
					}
				}
				if (i >= 7)
				{
					Writef (file, "\r\n %08x", code);
				}
				else
				{
					int mod, rm, basereg = -1, indexreg = -1;
					int scale = 1, offset = 0;

					Writef (file, "\r\n %08x", bytep - i);
					bytep -= i - 1;
					ReadProcessMemory (DbgProcess, bytep, &peekb, 1, NULL);
					mod = peekb >> 6;
					rm = peekb & 7;
					bytep++;

					if (mod == 0 && rm == 5)
					{
						mod = 2;
					}
					else if (rm == 4)
					{
						int index, base;

						ReadProcessMemory (DbgProcess, bytep, &peekb, 1, NULL);
						scale = 1 << (peekb >> 6);
						index = (peekb >> 3) & 7;
						base = peekb & 7;
						bytep++;

						if (index != 4)
						{
							indexreg = index;
						}
						if (base != 5)
						{
							basereg = base;
						}
						else
						{
							if (mod == 0)
							{
								mod = 2;
							}
							else
							{
								basereg = 5;
							}
						}
					}
					else
					{
						basereg = rm;
					}

					if (mod == 1)
					{
						signed char miniofs;
						ReadProcessMemory (DbgProcess, bytep++, &miniofs, 1, NULL);
						offset = miniofs;
					}
					else
					{
						ReadProcessMemory (DbgProcess, bytep, &offset, 4, NULL);
						bytep += 4;
					}
					if ((DWORD_PTR)bytep == code)
					{
						Writef (file, "  call [", bytep - i + 1);
						if (basereg >= 0)
						{
							Writef (file, "%s", regNames[basereg]);
						}
						if (indexreg >= 0)
						{
							Writef (file, "%s%s", basereg >= 0 ? "+" : "", regNames[indexreg]);
							if (scale > 1)
							{
								Writef (file, "*%d", scale);
							}
						}
						if (offset != 0)
						{
							if (indexreg < 0 && basereg < 0)
							{
								Writef (file, "%08x", offset);
							}
							else
							{
								char sign;
								if (offset < 0)
								{
									sign = '-';
									offset = -offset;
								}
								else
								{
									sign = '+';
								}
								Writef (file, "%c0x%x", sign, offset);
							}
						}
						Writef (file, "]");
					}
				}
			}
		}
	}
	Writef (file, "\r\n");
}

//==========================================================================
//
// DumpBytes
//
// Writes the bytes around EIP to the text report.
//
//==========================================================================

static void DumpBytes (HANDLE file, BYTE *address)
{
	char line[64*3], *line_p = line;
	DWORD len;
	BYTE peek;

	for (int i = 0; i < 16*3; ++i)
	{
		if ((i & 15) == 0)
		{
			line_p += sprintf (line_p, "\r\n%p:", address);
		}
		if (ReadProcessMemory (DbgProcess, address, &peek, 1, NULL))
		{
			line_p += sprintf (line_p, " %02x", *address);
		}
		else
		{
			line_p += sprintf (line_p, " --");
		}
		address++;
	}
	*line_p++ = '\r';
	*line_p++ = '\n';
	WriteFile (file, line, DWORD(line_p - line), &len, NULL);
}

//==========================================================================
//
// CreateTempFile
//
// Creates a new temporary with read/write access. The file will be deleted
// automatically when it is closed.
//
//==========================================================================

static HANDLE CreateTempFile ()
{
	char temppath[MAX_PATH-13];
	char tempname[MAX_PATH];
	if (!GetTempPath (sizeof(temppath), temppath))
	{
		temppath[0] = '.';
		temppath[1] = '\0';
	}
	if (!GetTempFileName (temppath, "zdo", 0, tempname))
	{
		return INVALID_HANDLE_VALUE;
	}
	return CreateFile (tempname, GENERIC_WRITE|GENERIC_READ, 0, NULL, CREATE_ALWAYS,
		FILE_ATTRIBUTE_TEMPORARY|FILE_FLAG_DELETE_ON_CLOSE|FILE_FLAG_SEQUENTIAL_SCAN,
		NULL);
}

//==========================================================================
//
// AddFile
//
// Add another file to be written to the tar.
//
//==========================================================================

static void AddFile (HANDLE file, const char *filename)
{
	if (NumFiles == MAX_FILES || file == INVALID_HANDLE_VALUE)
	{
		return;
	}
	TarFiles[NumFiles].File = file;
	TarFiles[NumFiles].Filename = filename;
	NumFiles++;
}

//==========================================================================
//
// CloseTarFiles
//
// Close all files that were previously registerd with AddFile(). They
// must still be open.
//
//==========================================================================

static void CloseTarFiles ()
{
	for (int i = 0; i < NumFiles; ++i)
	{
		CloseHandle (TarFiles[i].File);
	}
	NumFiles = 0;
}

//==========================================================================
//
// WriteBlock
//
// This is a wrapper around WriteFile. If stream is non-NULL, then the data
// is compressed before writing it to the file. outbuf must be 512 bytes.
//
//==========================================================================

static void WriteBlock (HANDLE file, LPCVOID buffer, DWORD bytes, z_stream *stream, Bytef *outbuf, DWORD *crc)
{
	if (stream == NULL)
	{
		WriteFile (file, buffer, bytes, &bytes, NULL);
	}
	else
	{
		stream->next_in = (Bytef *)buffer;
		stream->avail_in = bytes;
		*crc = crc32 (*crc, (const Bytef *)buffer, bytes);

		while (stream->avail_in != 0)
		{
			if (stream->avail_out == 0)
			{
				stream->next_out = outbuf;
				stream->avail_out = sizeof(tar::record);
				WriteFile (file, outbuf, sizeof(tar::record), &bytes, NULL);
			}
			deflate (stream, Z_NO_FLUSH);
		}
	}
}

//==========================================================================
//
// WriteTar
//
// Writes a .tar.gz file. If deflateInit fails, then ".gz" the gzip
// argument will be false, otherwise it will be set true. A HANDLE to the
// file is returned. This file is delete-on-close.
//
// The archive contains all the files previously passed to AddFile(). They
// must still be open, because WriteTar() does not open them itself.
//
//==========================================================================

static HANDLE MakeTar (bool &gzip)
{
	DWORD len;
	unsigned char gzipheader[10];
	tar::record record;
	Bytef outbuf[sizeof(record)];
	time_t now;
	int i, j, sum;
	HANDLE file;
	DWORD filesize, k;
	DWORD totalsize;
	z_stream stream;
	int err;
	DWORD crc;

	if (NumFiles == 0)
	{
		return INVALID_HANDLE_VALUE;
	}

	time (&now);

	stream.next_in = Z_NULL;
	stream.avail_in = 0;
	stream.zalloc = Z_NULL;
	stream.zfree = Z_NULL;
	err = deflateInit2 (&stream, Z_BEST_COMPRESSION, Z_DEFLATED, -MAX_WBITS,
		8, Z_DEFAULT_STRATEGY);
	gzip = err == Z_OK;

	// Open the tar file.
	file = CreateTempFile ();
	if (file == INVALID_HANDLE_VALUE)
	{
		if (gzip)
		{
			deflateEnd (&stream);
		}
		return file;
	}

	if (gzip = (err == Z_OK))
	{
		// Write GZIP header
		memcpy (gzipheader,   "\x1F\x8B\x08\x00    \x02\x0B", 10);
		memcpy (gzipheader+4, &now, 4);
		WriteFile (file, gzipheader, 10, &len, NULL);
		crc = crc32 (0, NULL, 0);
		stream.next_out = outbuf;
		stream.avail_out = sizeof(outbuf);
	}

	// Write out the tar archive, one file at a time
	for (i = 0, totalsize = 0; i < NumFiles; ++i)
	{
		// Fill in header information
		filesize = GetFileSize (TarFiles[i].File, NULL);

		// Skip empty files
		if (filesize == 0)
		{
			continue;
		}

		memset (&record, 0, sizeof(record));
		strcpy (record.header.name,  TarFiles[i].Filename);
		strcpy (record.header.mode,  "000666 ");
		strcpy (record.header.uid,   "     0 ");
		strcpy (record.header.gid,   "     0 ");
		strcpy (record.header.magic, "ustar  ");
		strcpy (record.header.uname, "zdoom");
		strcpy (record.header.gname, "games");
		sprintf(record.header.size,  "%11lo ", filesize);
		sprintf(record.header.mtime, "%11lo ", now);
		record.header.linkflag =     '0';

		// Calculate checksum
		memcpy (record.header.chksum, "        ", 8);
		for (j = 0, sum = 0; j < (int)sizeof(record); ++j)
		{
			sum += record.charptr[j];
		}
		sprintf (record.header.chksum, "%6o", sum);

		// Write out the header and then the file (padded to 512 bytes)
		WriteBlock (file, &record, sizeof(record), gzip ? &stream : NULL, outbuf, &crc);
		totalsize += sizeof(record);

		SetFilePointer (TarFiles[i].File, 0, NULL, FILE_BEGIN);
		for (k = 0; k < filesize; k += 512)
		{
			len = filesize - k;
			if (len > sizeof(record))
			{
				len = sizeof(record);
			}
			else
			{
				memset (&record.charptr[len], 0, sizeof(record)-len);
			}
			ReadFile (TarFiles[i].File, &record, len, &len, NULL);
			WriteBlock (file, &record, sizeof(record), gzip ? &stream : NULL, outbuf, &crc);
			totalsize += sizeof(record);
		}
	}

	// EOT is two zeroed blocks, according to GNU tar.
	memset (&record, 0, sizeof(record));
	WriteBlock (file, &record, sizeof(record), gzip ? &stream : NULL, outbuf, &crc);
	WriteBlock (file, &record, sizeof(record), gzip ? &stream : NULL, outbuf, &crc);
	totalsize += 2*sizeof(record);

	// Flush the zlib stream buffer and write the gzip epilogue
	if (gzip)
	{
		for (bool done = false;;)
		{
			len = sizeof(outbuf) - stream.avail_out;
			if (len != 0)
			{
				WriteFile (file, outbuf, len, &len, NULL);
				stream.next_out = outbuf;
				stream.avail_out = sizeof(outbuf);
			}
			if (done)
			{
				break;
			}
			err = deflate (&stream, Z_FINISH);
			done = stream.avail_out != 0 || err == Z_STREAM_END;
			if (err != Z_STREAM_END && err != Z_OK)
			{
				break;
			}
		}
		deflateEnd (&stream);
		memcpy (gzipheader,   &crc, 4);
		memcpy (gzipheader+4, &totalsize, 4);
		WriteFile (file, gzipheader, 8, &len, NULL);
	}
	return file;
}

static WNDPROC StdStaticProc;

//==========================================================================
//
// DrawTransparentBitmap
//
// The replacement for TransparentBlt that does not leak memory under
// Windows 98/ME. As seen in the MSKB.
//
//==========================================================================

void DrawTransparentBitmap(HDC hdc, HBITMAP hBitmap, short xStart,
						   short yStart, COLORREF cTransparentColor)
{
	BITMAP     bm;
	COLORREF   cColor;
	HBITMAP    bmAndBack, bmAndObject, bmAndMem, bmSave;
	HBITMAP    bmBackOld, bmObjectOld, bmMemOld, bmSaveOld;
	HDC        hdcMem, hdcBack, hdcObject, hdcTemp, hdcSave;
	POINT      ptSize;

	hdcTemp = CreateCompatibleDC(hdc);
	SelectObject(hdcTemp, hBitmap);   // Select the bitmap

	GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&bm);
	ptSize.x = bm.bmWidth;            // Get width of bitmap
	ptSize.y = bm.bmHeight;           // Get height of bitmap
	DPtoLP(hdcTemp, &ptSize, 1);      // Convert from device

	// to logical points

	// Create some DCs to hold temporary data.
	hdcBack   = CreateCompatibleDC(hdc);
	hdcObject = CreateCompatibleDC(hdc);
	hdcMem    = CreateCompatibleDC(hdc);
	hdcSave   = CreateCompatibleDC(hdc);

	// Create a bitmap for each DC. DCs are required for a number of
	// GDI functions.

	// Monochrome DC
	bmAndBack   = CreateBitmap(ptSize.x, ptSize.y, 1, 1, NULL);

	// Monochrome DC
	bmAndObject = CreateBitmap(ptSize.x, ptSize.y, 1, 1, NULL);

	bmAndMem    = CreateCompatibleBitmap(hdc, ptSize.x, ptSize.y);
	bmSave      = CreateCompatibleBitmap(hdc, ptSize.x, ptSize.y);

	// Each DC must select a bitmap object to store pixel data.
	bmBackOld   = (HBITMAP)SelectObject(hdcBack, bmAndBack);
	bmObjectOld = (HBITMAP)SelectObject(hdcObject, bmAndObject);
	bmMemOld    = (HBITMAP)SelectObject(hdcMem, bmAndMem);
	bmSaveOld   = (HBITMAP)SelectObject(hdcSave, bmSave);

	// Set proper mapping mode.
	SetMapMode(hdcTemp, GetMapMode(hdc));

	// Save the bitmap sent here, because it will be overwritten.
	BitBlt(hdcSave, 0, 0, ptSize.x, ptSize.y, hdcTemp, 0, 0, SRCCOPY);

	// Set the background color of the source DC to the color.
	// contained in the parts of the bitmap that should be transparent
	cColor = SetBkColor(hdcTemp, cTransparentColor);

	// Create the object mask for the bitmap by performing a BitBlt
	// from the source bitmap to a monochrome bitmap.
	BitBlt(hdcObject, 0, 0, ptSize.x, ptSize.y, hdcTemp, 0, 0,
		SRCCOPY);

	// Set the background color of the source DC back to the original
	// color.
	SetBkColor(hdcTemp, cColor);

	// Create the inverse of the object mask.
	BitBlt(hdcBack, 0, 0, ptSize.x, ptSize.y, hdcObject, 0, 0,
		NOTSRCCOPY);

	// Copy the background of the main DC to the destination.
	BitBlt(hdcMem, 0, 0, ptSize.x, ptSize.y, hdc, xStart, yStart,
		SRCCOPY);

	// Mask out the places where the bitmap will be placed.
	BitBlt(hdcMem, 0, 0, ptSize.x, ptSize.y, hdcObject, 0, 0, SRCAND);

	// Mask out the transparent colored pixels on the bitmap.
	BitBlt(hdcTemp, 0, 0, ptSize.x, ptSize.y, hdcBack, 0, 0, SRCAND);

	// XOR the bitmap with the background on the destination DC.
	BitBlt(hdcMem, 0, 0, ptSize.x, ptSize.y, hdcTemp, 0, 0, SRCPAINT);

	// Copy the destination to the screen.
	BitBlt(hdc, xStart, yStart, ptSize.x, ptSize.y, hdcMem, 0, 0,
		SRCCOPY);

	// Place the original bitmap back into the bitmap sent here.
	BitBlt(hdcTemp, 0, 0, ptSize.x, ptSize.y, hdcSave, 0, 0, SRCCOPY);

	// Delete the memory bitmaps.
	DeleteObject(SelectObject(hdcBack, bmBackOld));
	DeleteObject(SelectObject(hdcObject, bmObjectOld));
	DeleteObject(SelectObject(hdcMem, bmMemOld));
	DeleteObject(SelectObject(hdcSave, bmSaveOld));

	// Delete the memory DCs.
	DeleteDC(hdcMem);
	DeleteDC(hdcBack);
	DeleteDC(hdcObject);
	DeleteDC(hdcSave);
	DeleteDC(hdcTemp);
}

//==========================================================================
//
// TransparentStaticProc
//
// A special window procedure for the static control displaying the dying
// Doom Guy. It draws the bitmap with magenta as transparent. I could have
// made it an owner-draw control instead, but then I wouldn't get any of
// the standard bitmap graphic handling (like automatic sizing).
//
//==========================================================================

static LRESULT CALLBACK TransparentStaticProc (HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	RECT rect;
	PAINTSTRUCT paint;
	HDC dc;

	if (uMsg == WM_PAINT)
	{
		if (GetUpdateRect (hWnd, &rect, FALSE))
		{
			dc = BeginPaint (hWnd, &paint);
			if (dc != NULL)
			{
				HBITMAP bitmap = (HBITMAP)SendMessage (hWnd, STM_GETIMAGE, IMAGE_BITMAP, 0);
				if (bitmap != NULL)
				{
					DrawTransparentBitmap (dc, bitmap, 0, 0, RGB(255,0,255));
				}
				EndPaint (hWnd, &paint);
			}
		}
		return 0;
	}
	return CallWindowProc (StdStaticProc, hWnd, uMsg, wParam, lParam);
}

static HMODULE WinHlp32;
static char *UserSummary;

//==========================================================================
//
// AddDescriptionText
//
// Adds a file with the contents of the specified edit control to a new
// file in the tarball. The control's user data is used to keep track of
// the file handle for the created file, so you can call this more than
// once and it will only open the file the first time.
//
//==========================================================================

static void AddDescriptionText (HWND edit)
{
	DWORD textlen;

	textlen = (DWORD)SendMessage (edit, WM_GETTEXTLENGTH, 0, 0) + 1;
	if (textlen > 1)
	{
		UserSummary = (char *)HeapAlloc (GetProcessHeap(), 0, textlen);
		if (UserSummary != NULL)
		{
			textlen = (DWORD)SendMessage (edit, WM_GETTEXT, textlen, (LPARAM)UserSummary);
		}
	}
}

//==========================================================================
//
// OverviewDlgProc
//
// The DialogProc for the crash overview page.
//
//==========================================================================

static INT_PTR CALLBACK OverviewDlgProc (HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
	CHARFORMAT charFormat;
	HWND edit;
	ENLINK *link;

	switch (message)
	{
	case WM_INITDIALOG:
		if (pEnableThemeDialogTexture != NULL)
		{
			pEnableThemeDialogTexture (hDlg, ETDT_ENABLETAB);
		}

		// Setup the header at the top of the page.
		edit = GetDlgItem (hDlg, IDC_CRASHHEADER);
		SendMessage (edit, WM_SETTEXT, 0, (LPARAM)"ZDoom has encountered a problem and needs to close.\n"
			"We are sorry for the inconvenience.");
		
		// Setup a bold version of the standard dialog font and make the header bold.
		charFormat.cbSize = sizeof(charFormat);
		SendMessage (edit, EM_GETCHARFORMAT, SCF_DEFAULT, (LPARAM)&charFormat);
		charFormat.dwEffects = CFE_BOLD;
		SendMessage (edit, EM_SETCHARFORMAT, SCF_ALL, (LPARAM)&charFormat);

		// Setup the drawing routine for the dying guy's bitmap.
		edit = GetDlgItem (hDlg, IDC_DEADGUYVIEWER);
		StdStaticProc = (WNDPROC)(LONG_PTR)SetWindowLongPtr (edit, GWLP_WNDPROC, (WLONG_PTR)(LONG_PTR)TransparentStaticProc);

		// Fill in all the text just below the heading.
		edit = GetDlgItem (hDlg, IDC_PLEASETELLUS);
		SendMessage (edit, EM_AUTOURLDETECT, TRUE, 0);
		SendMessage (edit, WM_SETTEXT, 0, (LPARAM)"Please tell us about this problem.\n"
			"The information will NOT be sent to Microsoft.\n\n"
			"An error report has been created that you can submit to help improve ZDoom. "
			"You can either save it to disk and make a report in the bugs forum at http://forum.zdoom.org, "
			"or you can send it directly without letting other people know about it.");
		SendMessage (edit, EM_SETSEL, 0, 81);
		SendMessage (edit, EM_SETCHARFORMAT, SCF_SELECTION, (LPARAM)&charFormat);
		SendMessage (edit, EM_SETEVENTMASK, 0, ENM_LINK);

		// Assign a default invalid file handle to the user's edit control.
		edit = GetDlgItem (hDlg, IDC_CRASHINFO);
		SetWindowLongPtr (edit, GWLP_USERDATA, (LONG_PTR)INVALID_HANDLE_VALUE);

		// Fill in the summary text at the bottom of the page.
		edit = GetDlgItem (hDlg, IDC_CRASHSUMMARY);
		SendMessage (edit, WM_SETTEXT, 0, (LPARAM)CrashSummary);
		return TRUE;

	case WM_NOTIFY:
		// When the link in the "please tell us" edit control is clicked, open
		// the bugs forum in a browser window. ShellExecute is used to do this,
		// so the default browser, whatever it may be, will open it.
		link = (ENLINK *)lParam;
		if (link->nmhdr.idFrom == IDC_PLEASETELLUS && link->nmhdr.code == EN_LINK)
		{
			if (link->msg == WM_LBUTTONDOWN)
			{
				ShellExecute (NULL, "open", BUGS_FORUM_URL, NULL, NULL, 0);
				SetWindowLongPtr (hDlg, DWLP_MSGRESULT, 1);
				return TRUE;
			}
		}
		return FALSE;
		break;

	case WM_DESTROY:
		// When this pane is destroyed, extract the user's summary.
		AddDescriptionText (GetDlgItem (hDlg, IDC_CRASHINFO));
		break;
	}
	return FALSE;
}

//==========================================================================
//
// CrashDlgProc
//
// The DialogProc for the main crash dialog.
//
//==========================================================================

static INT_PTR CALLBACK CrashDlgProc (HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
	HWND edit;
	TCITEM tcitem;
	RECT tabrect, tcrect;
	LPNMHDR nmhdr;

	switch (message)
	{
	case WM_INITDIALOG:
		// Set up the tab control
		tcitem.mask = TCIF_TEXT | TCIF_PARAM;
		edit = GetDlgItem (hDlg, IDC_CRASHTAB);

		GetWindowRect (edit, &tcrect);
		ScreenToClient (hDlg, (LPPOINT)&tcrect.left);
		ScreenToClient (hDlg, (LPPOINT)&tcrect.right);

		// There are two tabs: Overview and Details. Each pane is created from a
		// dialog template, and the resultant window is stored as the lParam for
		// the corresponding tab.
		tcitem.pszText = "Overview";
		tcitem.lParam = (LPARAM)CreateDialogParam (g_hInst, MAKEINTRESOURCE(IDD_CRASHOVERVIEW), hDlg, OverviewDlgProc, (LPARAM)edit);
		TabCtrl_InsertItem (edit, 0, &tcitem);
		TabCtrl_GetItemRect (edit, 0, &tabrect);
		SetWindowPos ((HWND)tcitem.lParam, HWND_TOP, tcrect.left + 3, tcrect.top + tabrect.bottom + 3,
			tcrect.right - tcrect.left - 8, tcrect.bottom - tcrect.top - tabrect.bottom - 8, 0);

		tcitem.pszText = "Details";
		tcitem.lParam = (LPARAM)CreateDialogParam (g_hInst, MAKEINTRESOURCE(IDD_CRASHDETAILS), hDlg, DetailsDlgProc, (LPARAM)edit);;
		TabCtrl_InsertItem (edit, 1, &tcitem);
		SetWindowPos ((HWND)tcitem.lParam, HWND_TOP, tcrect.left + 3, tcrect.top + tabrect.bottom + 3,
			tcrect.right - tcrect.left - 8, tcrect.bottom - tcrect.top - tabrect.bottom - 8, 0);
		break;

	case WM_NOTIFY:
		nmhdr = (LPNMHDR)lParam;
		if (nmhdr->idFrom == IDC_CRASHTAB)
		{
			int i = TabCtrl_GetCurSel (nmhdr->hwndFrom);
			tcitem.mask = TCIF_PARAM;
			TabCtrl_GetItem (nmhdr->hwndFrom, i, &tcitem);
			edit = (HWND)tcitem.lParam;

			// TCN_SELCHANGING is sent just before the selected tab changes.
			// TCN_SELCHANGE is sent just after the selected tab changes.
			// So, when TCN_SELCHANGING is received hide the pane for the
			// selected tab, and when TCN_SELCHANGE is received, show the pane
			// for the selected tab.
			if (nmhdr->code == TCN_SELCHANGING)
			{
				ShowWindow (edit, SW_HIDE);
				SetWindowLongPtr (hDlg, DWLP_MSGRESULT, FALSE);
				return TRUE;
			}
			else if (nmhdr->code == TCN_SELCHANGE)
			{
				ShowWindow (edit, SW_SHOW);
				return TRUE;
			}
			else
			{
				return FALSE;
			}
		}
		break;

	case WM_COMMAND:
		if (HIWORD(wParam) == BN_CLICKED)
		{
			EndDialog (hDlg, LOWORD(wParam));
		}
		break;
	}
	return FALSE;
}

//==========================================================================
//
// DetailsDlgProc
//
// The dialog procedure for when the user wants to examine the files
// in the report.
//
//==========================================================================

static INT_PTR CALLBACK DetailsDlgProc (HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
	HGDIOBJ font;
	HWND ctrl;
	int i, j;

	switch (message)
	{
	case WM_INITDIALOG:
		if (pEnableThemeDialogTexture != NULL)
		{
			pEnableThemeDialogTexture (hDlg, ETDT_ENABLETAB);
		}

		// Set up the file contents display: Use a fixed width font,
		// no undos. The control's userdata stores the index of the
		// file currently displayed.
		ctrl = GetDlgItem (hDlg, IDC_CRASHFILECONTENTS);
		font = GetStockObject (ANSI_FIXED_FONT);
		if (font != INVALID_HANDLE_VALUE)
		{
			SendMessage (ctrl, WM_SETFONT, (WPARAM)font, FALSE);
		}
		SendMessage (ctrl, EM_SETUNDOLIMIT, 0, 0);
		SetWindowLongPtr (ctrl, GWLP_USERDATA, -1);
		SetEditControl (ctrl, GetDlgItem(hDlg, IDC_CRASHFILESIZE), 0);
		SendMessage (ctrl, LB_SETCURSEL, 0, 0);
		break;

	case WM_SHOWWINDOW:
		// When showing this pane, refresh the list of packaged files, and
		// update the contents display as necessary.
		if (wParam == TRUE)
		{
			ctrl = GetDlgItem (hDlg, IDC_CRASHFILES);
			j = (int)SendMessage (ctrl, LB_GETCURSEL, 0, 0);
			SendMessage (ctrl, LB_RESETCONTENT, 0, 0);
			for (i = 0; i < NumFiles; ++i)
			{
				SendMessage (ctrl, LB_ADDSTRING, 0, (LPARAM)TarFiles[i].Filename);
			}
			if (j == LB_ERR || j >= i) j = 0;
			SendMessage (ctrl, LB_SETCURSEL, j, 0);

			ctrl = GetDlgItem (hDlg, IDC_CRASHFILECONTENTS);
			if (j > 2) SetWindowLongPtr (ctrl, GWLP_USERDATA, -1);
			SetEditControl (ctrl, GetDlgItem(hDlg, IDC_CRASHFILESIZE), j);
		}
		break;

	case WM_COMMAND:
		// Selecting a different file makes the contents display update.
		if (HIWORD(wParam) == LBN_SELCHANGE)
		{
			i = (int)SendMessage ((HWND)lParam, LB_GETCURSEL, 0, 0);
			if (i != LB_ERR)
			{
				// Update the contents control for this file
				SetEditControl (GetDlgItem (hDlg, IDC_CRASHFILECONTENTS),
					GetDlgItem (hDlg, IDC_CRASHFILESIZE), i);
			}
		}
		break;
	}
	return FALSE;
}

//==========================================================================
//
// StreamEditText
//
// The callback function to stream a text file into a rich edit control.
//
//==========================================================================

static DWORD CALLBACK StreamEditText (DWORD_PTR cookie, LPBYTE buffer, LONG cb, LONG *pcb)
{
	DWORD wrote;
	ReadFile ((HANDLE)cookie, buffer, cb, &wrote, NULL);
	*pcb = wrote;
	return wrote == 0;
}

//==========================================================================
//
// StreamEditBinary
//
// The callback function to stream a binary file into a rich edit control.
// The binary file is converted to a RTF hex dump so that the different
// columns can be color-coded.
//
//==========================================================================

struct BinStreamInfo
{
	int Stage;
	HANDLE File;
	DWORD Pointer;
};

static DWORD CALLBACK StreamEditBinary (DWORD_PTR cookie, LPBYTE buffer, LONG cb, LONG *pcb)
{
	BinStreamInfo *info = (BinStreamInfo *)cookie;
	BYTE buf16[16];
	DWORD read, i;
	char *buff_p = (char *)buffer;

repeat:
	switch (info->Stage)
	{
	case 0:		// Write prologue
		buff_p += sprintf (buff_p, "{\\rtf1\\ansi\\deff0"
			"{\\colortbl ;\\red0\\green0\\blue80;\\red0\\green0\\blue0;\\red80\\green0\\blue80;}"
			"\\viewkind4\\pard");
		info->Stage++;
		break;

	case 1:		// Write body
		while (cb - ((LPBYTE)buff_p - buffer) > 150)
		{
			ReadFile (info->File, buf16, 16, &read, NULL);
			if (read == 0)
			{
				info->Stage++;
				goto repeat;
			}
			char *linestart = buff_p;
			buff_p += sprintf (buff_p, "\\cf1 %08lx:\\cf2 ", info->Pointer);
			info->Pointer += read;

			for (i = 0; i < read;)
			{
				if (i <= read - 4)
				{
					buff_p += sprintf (buff_p, " %08lx", *(DWORD *)&buf16[i]);
					i += 4;
				}
				else
				{
					buff_p += sprintf (buff_p, " %02x", buf16[i]);
					i += 1;
				}
			}
			while (buff_p - linestart < 57)
			{
				*buff_p++ = ' ';
			}
			buff_p += sprintf (buff_p, "\\cf3 ");
			for (i = 0; i < read; ++i)
			{
				BYTE code = buf16[i];
				if (code < 0x20 || code > 0x7f) code = 0xB7;
				if (code == '\\' || code == '{' || code == '}') *buff_p++ = '\\';
				*buff_p++ = code;
			}
			buff_p += sprintf (buff_p, "\\par\r\n");
		}
		break;

	case 2:		// Write epilogue
		buff_p += sprintf (buff_p, "\\cf0 }");
		info->Stage++;
		break;

	case 3:		// We're done
		return TRUE;
	}

	*pcb = (LONG)((LPBYTE)buff_p - buffer);
	return FALSE;
}

//==========================================================================
//
// SetEditControl
//
// Fills the edit control with the contents of the chosen file.
// If the filename ends with ".txt" the file is assumed to be text.
// Otherwise it is treated as binary, and you get a hex dump.
//
//==========================================================================

static void SetEditControl (HWND edit, HWND sizedisplay, int filenum)
{
	char sizebuf[32];
	EDITSTREAM stream;
	DWORD size;
	POINT pt = { 0, 0 };

	// Don't refresh the control if it's already showing the file we want.
	if (GetWindowLongPtr (edit, GWLP_USERDATA) == filenum)
	{
		return;
	}

	size = GetFileSize (TarFiles[filenum].File, NULL);
	if (size < 1024)
	{
		sprintf (sizebuf, "(%lu bytes)", size);
	}
	else
	{
		sprintf (sizebuf, "(%lu KB)", size/1024);
	}
	SetWindowText (sizedisplay, sizebuf);

	SetWindowLongPtr (edit, GWLP_USERDATA, filenum);

	SetFilePointer (TarFiles[filenum].File, 0, NULL, FILE_BEGIN);
	SendMessage (edit, EM_SETSCROLLPOS, 0, (LPARAM)&pt);

	// Text files are streamed in as-is.
	// Binary files are streamed in as color-coded hex dumps.
	stream.dwError = 0;
	if (strstr (TarFiles[filenum].Filename, ".txt") != NULL)
	{
		CHARFORMAT beBlack;

		beBlack.cbSize = sizeof(beBlack);
		beBlack.dwMask = CFM_COLOR;
		beBlack.dwEffects = 0;
		beBlack.crTextColor = RGB(0,0,0);
		SendMessage (edit, EM_SETCHARFORMAT, 0, (LPARAM)&beBlack);
		stream.dwCookie = (DWORD_PTR)TarFiles[filenum].File;
		stream.pfnCallback = StreamEditText;
		SendMessage (edit, EM_STREAMIN, SF_TEXT, (LPARAM)&stream);
	}
	else
	{
		BinStreamInfo info = { 0, TarFiles[filenum].File, 0 };
		stream.dwCookie = (DWORD_PTR)&info;
		stream.pfnCallback = StreamEditBinary;
		SendMessage (edit, EM_EXLIMITTEXT, 0, GetFileSize(TarFiles[filenum].File, NULL)*7);
		SendMessage (edit, EM_STREAMIN, SF_RTF, (LPARAM)&stream);
	}
	SendMessage (edit, EM_SETSEL, (WPARAM)-1, 0);
}

#if 0		// Server-side support is not done yet

//==========================================================================
//
// GetHeader
//
// Receives the HTTP header from a socket, up to and including the empty
// line that terminates the header.
//
//==========================================================================

static char *GetHeader (SOCKET sock)
{
	DWORD spaceHave = 0, spaceAt = 0;
	char *space = NULL;
	char inchar;
	int got;

	for (;;)
	{
		// Get one character
		got = recv (sock, &inchar, 1, 0);
		if (got != 1)
		{
error:
			if (space != NULL) HeapFree (GetProcessHeap(), 0, space);
			return NULL;
		}
		// Append it to the header we have so far
		if (space == NULL)
		{
			spaceHave = 256;
			space = (char *)HeapAlloc (GetProcessHeap(), 0, 256);
		}
		else if (spaceAt == spaceHave-1)
		{
			spaceHave += 256;
			space = (char *)HeapReAlloc (GetProcessHeap(), 0, space, spaceHave);
		}
		switch (spaceAt)
		{
		case 0: if (inchar != 'H') goto error; break;
		case 1: if (inchar != 'T') goto error; break;
		case 2: if (inchar != 'T') goto error; break;
		case 3: if (inchar != 'P') goto error; break;
		case 4: if (inchar != '/') goto error; break;
		}
		space[spaceAt++] = inchar;
		if (inchar == '\n' && space[spaceAt-2] == '\r' && space[spaceAt-3] == '\n' && space[spaceAt-4] == '\r')
		{ // The header is complete
			break;
		}
	}
	space[spaceAt++] = '\0';
	if (spaceAt < 12) goto error;
	return space;
}

//==========================================================================
//
// UploadFail
//
// Stuffs some text into the status control to indicate what went wrong.
//
//==========================================================================

static void UploadFail (HWND hDlg, const char *message, int reason)
{
	char buff[512];

	sprintf (buff, "%s: %d", message, reason);
	SetWindowText (GetDlgItem (hDlg, IDC_BOINGSTATUS), buff);

	if (reason >= 10000 && reason <= 11999)
	{
		LPVOID lpMsgBuf;
		if (FormatMessage (FORMAT_MESSAGE_ALLOCATE_BUFFER |
			FORMAT_MESSAGE_FROM_SYSTEM |
			FORMAT_MESSAGE_IGNORE_INSERTS,
			NULL,
			GetLastError(),
			MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
			(LPTSTR)&lpMsgBuf,
			0,
			NULL))
		{
			SetWindowText (GetDlgItem (hDlg, IDC_BOINGEDIT), (LPCSTR)lpMsgBuf);
			LocalFree (lpMsgBuf);
		}
	}
}

//==========================================================================
//
// GetChunkLen
//
// Returns the chunk length for a HTTP response using the chunked
// transfer-encoding.
//
//==========================================================================

static int GetChunkLen (SOCKET sock)
{
	char crlf[2] = { '\r', '\n' };
	int len = 0;
	int stage = 0;
	char inchar;

	while (recv (sock, &inchar, 1, 0) == 1)
	{
		switch (stage)
		{
		case 0:	// Checking for CRLF from the previous chunk
		case 1:
			if (inchar == crlf[stage]) { stage++; break; }
			else stage = 2;

		case 2:	// Reading length
			if (inchar == ';') stage = 3;
			else if (inchar >= '0' && inchar <= '9') len = (len << 4) | (inchar - '0');
			else if (inchar >= 'A' && inchar <= 'F') len = (len << 4) | ((inchar - 'A') + 10);
			else if (inchar >= 'a' && inchar <= 'f') len = (len << 4) | ((inchar - 'a') + 10);
			else if (inchar == '\r') stage = 4;
			break;

		case 3: // Skipping chunk extension
		case 4:
			if (inchar == crlf[stage-3]) stage++;
			else stage = 3;
			if (stage == 5)
			{
				return len;
			}
			break;
		}
	}
	return len;
}

//==========================================================================
//
// TranslateHTML
//
// Converts HTML text into something closer to plain-text and appends it
// to the edit control's contents.
//
//==========================================================================

struct TranslateHTML
{
	TranslateHTML (char *header, HWND editcontrol)
		: edit(editcontrol), state(0), allowspace(false)
	{
		plaintext = strstr (header, "content-type: text/html") == NULL;
	}
	void Translate (char *buf);

	HWND edit;
	int state;
	bool allowspace;
	char token[64];
	bool plaintext;
};

void TranslateHTML::Translate (char *buf)
{
	char *in, *out;
	int tokenp = 0;
	bool endrange = false;
	bool inhead = false, inscript = false;

	if (plaintext)
	{
		SendMessage (edit, EM_REPLACESEL, 0, (LPARAM)buf);
		return;
	}

	for (in = out = buf; *in != 0; in++)
	{
		char x = *in;
		switch (state)
		{
		case 0:	// Not in a token
			if (x == '<' || x == '&')
			{
				state = x == '<' ? 1 : 11;
			}
			else if (!inhead && !inscript)
			{
				if (x <= ' ')
				{
					if (allowspace)
					{
						allowspace = false;
						*out++ = ' ';
					}
				}
				else
				{
					*out++ = x;
					allowspace = true;
				}
			}
			break;

		case 1:	// Just got a '<'
			state = 2;
			tokenp = 0;
			if (x == '/')
			{
				endrange = true;
				break;
			}
			else if (x == '!')
			{
				state = 20;
				break;
			}
			else
			{
				endrange = false;
			}

		case 2: // Somewhere past '<'
			if (x == '>')
			{ // Token finished
gottoken:
				token[tokenp] = 0;
				if (!endrange)
				{
					if (stricmp (token, "head") == 0)
					{
						inhead = true;
					}
					else if (stricmp (token, "script") == 0)
					{
						inscript = true;
					}
					else if (stricmp (token, "p") == 0 || stricmp (token, "address") == 0)
					{
						*out++ = '\n';
						*out++ = '\n';
						allowspace = false;
					}
					else if (stricmp (token, "br") == 0)
					{
						*out++ = '\n';
						allowspace = false;
					}
					else if (stricmp (token, "li") == 0)
					{
						*out++ = '\n';
						*out++ = '*';
						*out++ = ' ';
						allowspace = false;
					}
					else if ((token[0] == 'h' || token[0] == 'H') && token[1] >= '0' && token[1] <= '9' && token[2] == '\0')
					{
						*out++ = '\n';
						allowspace = false;
					}
				}
				else
				{
					if (stricmp (token, "head") == 0)
					{
						inhead = false;
					}
					else if (stricmp (token, "script") == 0)
					{
						inscript = false;
					}
					else if ((token[0] == 'h' || token[0] == 'H') && token[1] >= '0' && token[1] <= '9' && token[2] == '\0')
					{
						*out++ = '\n';
						*out++ = '\n';
						allowspace = false;
					}
					else if (stricmp (token, "ul") == 0 || stricmp (token, "ol") == 0)
					{
						*out++ = '\n';
						allowspace = false;
					}
				}
				state = 0;
			}
			else if (x == ' ')
			{
				state = 3;
			}
			else if (tokenp < 63)
			{
				token[tokenp++] = x;
			}
			break;

		case 3: // Past '<' TOKEN ' '
			if (x == '>')
			{ // Token finished
				goto gottoken;
			}
			break;

		case 11:	// Just got a '&'
			state = 12;
			tokenp = 0;

		case 12:
			if (x == ';')
			{ // Token finished
				if (stricmp (token, "lt") == 0)
				{
					*out++ = '<';
				}
				else if (stricmp (token, "gt") == 0)
				{
					*out++ = '>';
				}
				else if (stricmp (token, "amp") == 0)
				{
					*out++ = '&';
				}
				state = 0;
			}
			else if (tokenp < 63)
			{
				token[tokenp++] = x;
			}
			break;

		case 20:	// Just got "<!"
		case 21:	// Just got "<!-"
			if (x == '-') state++;
			else state = 2;
			break;

		case 22:	// Somewhere after "<!--"
		case 23:	// Just got '-'
			if (x == '-') state++;
			else state = 22;
			break;

		case 24:	// Just got "--"
			if (x == '>')
			{
				state = 0;
			}
			else
			{
				state = 22;
			}
			break;
		}
	}
	if (out != buf)
	{
		*out++ = '\0';
		SendMessage (edit, EM_REPLACESEL, 0, (LPARAM)buf);
	}
}

//==========================================================================
//
// ReadResponse
//
// Read the HTTP response. If file is not INVALID_HANDLE_VALUE, then the
// response is downloaded to the file. Otherwise, it is passed through
// TranslateHTML and into the upload dialog's edit control.
//
//==========================================================================

static bool ReadResponse (HWND hDlg, char *header, SOCKET sock, char *buf, int bufsize, HANDLE file)
{
	HWND edit = GetDlgItem (hDlg, IDC_BOINGEDIT);
	DWORD wrote;
	int len, avail, totalRecv;
	int recvBytes = 0;
	POINT pt = { 0, 0 };

	strlwr (header);

	TranslateHTML translator (header, edit);
	SendMessage (edit, WM_SETREDRAW, FALSE, 0);

	if (strstr (header, "transfer-encoding: chunked") != NULL)
	{ // Response body is chunked
		for (;;)
		{
			len = GetChunkLen (sock);
			if (len == 0)
			{
				break;
			}
			while (len > 0)
			{
				if (len > bufsize-1) avail = bufsize-1;
				else avail = len;
				recvBytes = recv (sock, buf, avail, 0);
				if (recvBytes == 0 || recvBytes == SOCKET_ERROR)
				{
					goto done;
				}
				buf[recvBytes] = '\0';
				if (file != INVALID_HANDLE_VALUE)
				{
					WriteFile (file, buf, recvBytes, &wrote, NULL);
				}
				else
				{
					translator.Translate (buf);
				}
				len -= recvBytes;
			}
		}
	}
	else
	{ // Response body is uninterrupted
		char *lenhead = strstr (header, "content-length: ");
		if (lenhead != 0)
		{
			len = strtol (lenhead + 16, NULL, 10);
			if (file != INVALID_HANDLE_VALUE)
			{
				ShowWindow (GetDlgItem (hDlg, IDC_BOINGPROGRESS), SW_SHOW);
				SendMessage (GetDlgItem (hDlg, IDC_BOINGPROGRESS), PBM_SETRANGE, 0, MAKELPARAM (0, (len + bufsize-2)/(bufsize-1)));
			}
		}
		else
		{
			len = 0;
		}
		totalRecv = 0;
		for (;;)
		{
			if (len == 0) avail = bufsize - 1;
			else
			{
				avail = len - totalRecv;
				if (avail > bufsize - 1) avail = bufsize - 1;
			}
			recvBytes = recv (sock, buf, avail, 0);
			if (recvBytes == 0 || recvBytes == SOCKET_ERROR)
			{
				break;
			}
			totalRecv += recvBytes;
			buf[recvBytes] = '\0';
			if (file != INVALID_HANDLE_VALUE)
			{
				SendMessage (GetDlgItem (hDlg, IDC_BOINGPROGRESS), PBM_SETPOS, totalRecv/(bufsize-1), 0);
				WriteFile (file, buf, recvBytes, &wrote, NULL);
			}
			else
			{
				translator.Translate (buf);
			}
			if (len != 0 && totalRecv >= len)
			{
				break;
			}
		}
	}
done:
	SendMessage (edit, EM_SETSCROLLPOS, 0, (LPARAM)&pt);
	SendMessage (edit, WM_SETREDRAW, TRUE, 0);
	InvalidateRect (edit, NULL, FALSE);
	return recvBytes != SOCKET_ERROR;
}

//==========================================================================
//
// CheckServerResponse
//
// Waits for a response from the server. If it doesn't get a 1xx or 2xx
// response, the response is displayed. The return value is either the
// response code or -1 if a socket error occurred.
//
//==========================================================================

static int CheckServerResponse (HWND hDlg, SOCKET sock, char *&header, char *buf, int bufsize)
{
	int response;

	header = GetHeader (sock);
	if (header == NULL)
	{
		UploadFail (hDlg, "Error reading server response", WSAGetLastError());
		return -1;
	}
	response = strtoul (strchr (header, ' '), NULL, 10);
	if (response >= 300)
	{
		char *topline = strstr (header, "\r\n");
		*topline = 0;
		SetWindowText (GetDlgItem (hDlg, IDC_BOINGSTATUS), header);
		*topline = '\r';
		if (response != 304)
		{
			ReadResponse (hDlg, header, sock, buf, bufsize, INVALID_HANDLE_VALUE);
		}
	}
	return response;
}

//==========================================================================
//
// CabinetCallback
//
// Used to extract dbghelp.dll out of the downloaded cabinet.
//
//==========================================================================

static UINT CALLBACK CabinetCallback (PVOID context, UINT notification, UINT_PTR param1, UINT_PTR param2)
{
	if (notification == SPFILENOTIFY_FILEINCABINET)
	{
		FILE_IN_CABINET_INFO *info = (FILE_IN_CABINET_INFO *)param1;
		if (strcmp (info->NameInCabinet, "dbghelp.dll") == 0)
		{
			strncpy (info->FullTargetName, (char *)context, sizeof(info->FullTargetName));
			info->FullTargetName[sizeof(info->FullTargetName)-1] = '\0';
			info->FullTargetName[strlen(info->FullTargetName)-1] = 'l';
			return FILEOP_DOIT;
		}
		return FILEOP_SKIP;
	}
	return NO_ERROR;
}

struct UploadParmStruct
{
	HWND hDlg;
	HANDLE hThread;
	HANDLE hFile;
	bool gzipped;
	const char *UserSummary;
};

//==========================================================================
//
// UploadProc
//
// Drives the error report upload and optionally the dbghelp download,
// using standard HTTP requests.
//
//==========================================================================

static DWORD WINAPI UploadProc (LPVOID lpParam)
{
	char dbghelpPath[MAX_PATH+12];
	UploadParmStruct *parm = (UploadParmStruct *)lpParam;
	char xferbuf[1024];
	WSADATA wsad;
	SOCKET sock = INVALID_SOCKET;
	addrinfo aiHints = { 0 };
	addrinfo *aiList = NULL;
	char *header = NULL;
	DWORD fileLen, fileLeft, contentLength;
	int bytesSent;
	int headerLen;
	int err, i;
	int retries;
	DWORD returnval = TRUE;
	HANDLE dbghelp = INVALID_HANDLE_VALUE;
	HWND status = GetDlgItem (parm->hDlg, IDC_BOINGSTATUS);

	dbghelpPath[0] = '\0';
	SetWindowText (status, "Looking up " REMOTE_HOST "...");

	// Startup Winsock. If this doesn't work, then we can't do anything.
	err = WSAStartup (0x0101, &wsad);
	if (err != 0)
	{
		UploadFail (parm->hDlg, "Could not initialize Winsock", err);
		return FALSE;
	}

	try
	{
		OSVERSIONINFO verinfo = { sizeof(verinfo) };
		GetVersionEx (&verinfo);
		if (verinfo.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS)
		{
			verinfo.dwBuildNumber &= 0xFFFF;
		}

		// Lookup the host we want to talk with.
		aiHints.ai_family = AF_INET;
		aiHints.ai_socktype = SOCK_STREAM;
		aiHints.ai_protocol = IPPROTO_TCP;

		err = getaddrinfo (REMOTE_HOST, REMOTE_PORT, &aiHints, &aiList);
		if (err != 0 || aiList == NULL)
		{
			UploadFail (parm->hDlg, "Could not resolve " REMOTE_HOST, err);
			throw 1;
		}

		// Create a new socket...
		sock = socket (aiList->ai_family, aiList->ai_socktype, aiList->ai_protocol);
		if (sock == INVALID_SOCKET)
		{
			UploadFail (parm->hDlg, "Could not create socket", WSAGetLastError());
			throw 1;
		}

		int timeout = TIMEOUT;
		setsockopt (sock, SOL_SOCKET, SO_RCVTIMEO, (char *)&timeout, sizeof(timeout));
		setsockopt (sock, SOL_SOCKET, SO_SNDTIMEO, (char *)&timeout, sizeof(timeout));

		// ...and connect it to the remote host.
		SetWindowText (status, "Connecting to " REMOTE_HOST "...");
		err = connect (sock, aiList->ai_addr, sizeof(*aiList->ai_addr));
		if (err == SOCKET_ERROR)
		{
			UploadFail (parm->hDlg, "Failed to connect", WSAGetLastError());
			throw 1;
		}

		// Now tell the host we want to submit the report.
		SetWindowText (status, "Sending HTTP request...");
		fileLen = GetFileSize (parm->hFile, NULL);
		contentLength = sizeof(MultipartInfoHeader)-1 + 8+9*7+2 + strlen(verinfo.szCSDVersion) +
						(parm->UserSummary ? (sizeof(MultipartUserSummaryHeader)-1 + strlen(UserSummary)) : 0) +
						sizeof(MultipartBinaryHeader)-1 +
						sizeof(MultipartHeaderGZip)-1 + fileLen +
						sizeof(MultipartFooter)-1;
		if (!parm->gzipped)
		{
			contentLength -= sizeof(MultipartHeaderGZip) - sizeof(MultipartHeaderNoGZip);
		}
		headerLen = sprintf (xferbuf, PostHeader, contentLength);
		bytesSent = send (sock, xferbuf, headerLen, 0);
		if (bytesSent != headerLen)
		{
			UploadFail (parm->hDlg, "Could not send HTTP request", WSAGetLastError());
			throw 1;
		}

		// Wait for a 100 continue response from the host.
		err = CheckServerResponse (parm->hDlg, sock, header, xferbuf, sizeof(xferbuf));
		if (err < 0 || err >= 300)
		{
			throw 1;
		}

		// And now that we have it, we can finally send the report.
		SetWindowText (status, "Sending report...");

		// First show the progress bar so the user knows how much of the report has been sent.
		ShowWindow (GetDlgItem (parm->hDlg, IDC_BOINGPROGRESS), SW_SHOW);
		SendMessage (GetDlgItem (parm->hDlg, IDC_BOINGPROGRESS), PBM_SETRANGE, 0, MAKELPARAM (0, (fileLen + sizeof(xferbuf)-1)/sizeof(xferbuf)));

		// Send the bare-bones info (exception and windows version info)
		bytesSent = send (sock, MultipartInfoHeader, sizeof(MultipartInfoHeader)-1, 0);
		if (bytesSent == SOCKET_ERROR)
		{
			UploadFail (parm->hDlg, "Could not upload report", WSAGetLastError());
			throw 1;
		}
		headerLen = sprintf (xferbuf, "Windows %08lX %p %X %08lX %08lX %08lX %08lX %08lX %s",
			CrashPointers.ExceptionRecord->ExceptionCode,
			CrashPointers.ExceptionRecord->ExceptionAddress,
			!!CrashPointers.ExceptionRecord->ExceptionInformation[0],
			CrashPointers.ExceptionRecord->ExceptionInformation[1],

			verinfo.dwMajorVersion,
			verinfo.dwMinorVersion,
			verinfo.dwBuildNumber,
			verinfo.dwPlatformId,
			verinfo.szCSDVersion);
		bytesSent = send (sock, xferbuf, headerLen, 0);
		if (bytesSent == SOCKET_ERROR)
		{
			UploadFail (parm->hDlg, "Could not upload report", WSAGetLastError());
			throw 1;
		}

		// Send the user summary.
		if (parm->UserSummary)
		{
			bytesSent = send (sock, MultipartUserSummaryHeader, sizeof(MultipartUserSummaryHeader)-1, 0);
			if (bytesSent == SOCKET_ERROR)
			{
				UploadFail (parm->hDlg, "Could not upload report", WSAGetLastError());
				throw 1;
			}
			bytesSent = send (sock, parm->UserSummary, (int)strlen(parm->UserSummary), 0);
			if (bytesSent == SOCKET_ERROR)
			{
				UploadFail (parm->hDlg, "Could not upload report", WSAGetLastError());
				throw 1;
			}
		}

		// Send the report file.
		headerLen = sprintf (xferbuf, "%s%s", MultipartBinaryHeader,
			parm->gzipped ? MultipartHeaderGZip : MultipartHeaderNoGZip);

		bytesSent = send (sock, xferbuf, headerLen, 0);
		if (bytesSent == SOCKET_ERROR)
		{
			UploadFail (parm->hDlg, "Could not upload report", WSAGetLastError());
			throw 1;
		}

		// Send the report itself.
		SetFilePointer (parm->hFile, 0, NULL, FILE_BEGIN);
		fileLeft = fileLen;
		i = 0;
		while (fileLeft != 0)
		{
			DWORD grab = fileLeft > sizeof(xferbuf) ? sizeof(xferbuf) : fileLeft;
			DWORD didread;

			ReadFile (parm->hFile, xferbuf, grab, &didread, NULL);
			bytesSent = send (sock, xferbuf, didread, 0);
			if (bytesSent == SOCKET_ERROR)
			{
				UploadFail (parm->hDlg, "Could not upload report", WSAGetLastError());
				throw 1;
			}
			fileLeft -= grab;
			SendMessage (GetDlgItem (parm->hDlg, IDC_BOINGPROGRESS), PBM_SETPOS, ++i, 0);
		}
		// Send the multipart footer.
		bytesSent += send (sock, MultipartFooter, sizeof(MultipartFooter) - 1, 0);

		// And now we're done uploading the report. Yay!
		SetWindowText (status, "Report sent");

		// But we still need a 200 response from the host. Hopefully it gives us one.
		HeapFree (GetProcessHeap(), 0, header);
		err = CheckServerResponse (parm->hDlg, sock, header, xferbuf, sizeof(xferbuf));
		if (err < 0 || err >= 300)
		{
			throw 1;
		}

		// Fill the edit control with the response body, in case the host wants
		// to say, "Thank you for clicking that send button."
		ReadResponse (parm->hDlg, header, sock, xferbuf, sizeof(xferbuf), INVALID_HANDLE_VALUE);

		// Close the connection, because we told the host this was a one-shot communication.
		closesocket (sock); sock = INVALID_SOCKET;

		// If dbghelp.dll was not available or too old when the report was created,
		// ask the user if they want to download it. It's too late to be of any use
		// to this report, but it can still be used for future reports.
		if (NeedDbgHelp && MessageBox (parm->hDlg,
			"Shall I download dbghelp.dll?\n\n"
			"This is a Microsoft-supplied DLL that can gather detailed information when a program crashes.\n\n"
			"Although it is not essential for ZDoom, it will make any future error\n"
			"reports more useful, so it is strongly suggested that you answer \"yes.\"\n\n"
			"If you answer \"yes,\" dbghelp.dll will be installed in the same directory as ZDoom.",
			"Download dbghelp.dll?", MB_YESNO|MB_ICONQUESTION) == IDYES)
		{
			char *bs;

			// Download it to the same directory as zdoom.exe.
			GetModuleFileName (NULL, dbghelpPath, MAX_PATH);
			dbghelpPath[MAX_PATH] = 0;
			bs = strrchr (dbghelpPath, '\\');
			if (bs != NULL)
			{
				strcpy (bs + 1, "dbghelp.dl_");
			}
			else
			{
				strcpy (dbghelpPath, "dbghelp.dl_");
			}
			dbghelp = CreateFile (dbghelpPath, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, 0, NULL);
			if (dbghelp != INVALID_HANDLE_VALUE)
			{
				SetWindowText (status, "Receiving dbghelp...");
				retries = 0;

				// Reopen the socket. We don't need to repeat the lookup, because
				// we already know where the host is.
				SetWindowText (status, "Reconnecting to " REMOTE_HOST "...");
				sock = socket (aiList->ai_family, aiList->ai_socktype, aiList->ai_protocol);
				if (sock == INVALID_SOCKET)
				{
					UploadFail (parm->hDlg, "Could not create socket", WSAGetLastError());
					throw 1;
				}

				// Socket is open. Try reconnecting now.
				err = connect (sock, aiList->ai_addr, sizeof(*aiList->ai_addr));
				if (err == SOCKET_ERROR)
				{
					UploadFail (parm->hDlg, "Failed to reconnect", WSAGetLastError());
					throw 2;
				}
				SetWindowText (status, "Receiving dbghelp...");

				// And send the request.
				bytesSent = send (sock, DbgHelpRequest, sizeof(DbgHelpRequest)-1, 0);
				if (bytesSent == 0 || bytesSent == SOCKET_ERROR)
				{
					UploadFail (parm->hDlg, "Failed trying to request dbghelp", WSAGetLastError());
					throw 2;
				}

				// Ignore any information replies from the server. There shouldn't be any,
				// but this loop is here just in case.
				err = 100;
				while (err / 100 == 1)
				{
					HeapFree (GetProcessHeap(), 0, header);
					err = CheckServerResponse (parm->hDlg, sock, header, xferbuf, sizeof(xferbuf));
				}
				// Now, if we haven't received a 200 OK response, give up because we
				// shouldn't receive anything but that.
				if (err != 200)
				{
					throw 2;
				}
				// Write the response body to the dbghelp.dl_ file.
				if (!ReadResponse (parm->hDlg, header, sock, xferbuf, sizeof(xferbuf), dbghelp))
				{
					UploadFail (parm->hDlg, "Could not receive dbghelp", WSAGetLastError());
					throw 2;
				}
				CloseHandle (dbghelp); dbghelp = INVALID_HANDLE_VALUE;

				// Now use the Setup API to extract dbghelp.dll from the file we just downloaded.
				if (!SetupIterateCabinet (dbghelpPath, 0, CabinetCallback, dbghelpPath))
				{
					UploadFail (parm->hDlg, "Extraction of dbghelp failed", GetLastError());
				}

				// And now we're done with that. There's nothing more to do here now.
				SetWindowText (status, "Dbghelp installed");
			}
		}
	}
	catch (...)
	{
		returnval = FALSE;
	}

	ShowWindow (GetDlgItem (parm->hDlg, IDC_BOINGPROGRESS), SW_HIDE);
	KillTimer (parm->hDlg, 1);
	EnableWindow (GetDlgItem (parm->hDlg, IDOK), TRUE);
	EnableWindow (GetDlgItem (parm->hDlg, IDC_BOINGEDIT), TRUE);

	if (dbghelp != INVALID_HANDLE_VALUE) CloseHandle (dbghelp);
	if (dbghelpPath[0] != '\0') DeleteFile (dbghelpPath);
	if (header != NULL) HeapFree (GetProcessHeap(), 0, header);
	if (sock != INVALID_SOCKET) closesocket (sock);
	if (aiList != NULL) freeaddrinfo (aiList);
	WSACleanup ();
	return returnval;
}

//==========================================================================
//
// BoingDlgProc
//
// The dialog procedure for the upload status dialog. Aside from spawning
// off a new thread executing UploadProc, it doesn't do a whole lot.
//
//==========================================================================

static BOOL CALLBACK BoingDlgProc (HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
	UploadParmStruct *parms = (UploadParmStruct *)lParam;
	HWND ctrl;
	WLONG_PTR iconNum;
	HANDLE icon;
	DWORD threadID;

	switch (message)
	{
	case WM_INITDIALOG:
		SetTimer (hDlg, 1, 100, NULL);
		ctrl = GetDlgItem (hDlg, IDC_BOING);
		SetWindowLongPtr (ctrl, GWLP_USERDATA, IDI_BOING1);
		parms->hDlg = hDlg;
		parms->hThread = CreateThread (NULL, 0, UploadProc, parms, 0, &threadID);
		return TRUE;

	case WM_TIMER:
		if (wParam == 1)
		{
			ctrl = GetDlgItem (hDlg, IDC_BOING);
			iconNum = GetWindowLongPtr (ctrl, GWLP_USERDATA) + 1;
			if (iconNum > IDI_BOING8) iconNum = IDI_BOING1;
			SetWindowLongPtr (ctrl, GWLP_USERDATA, iconNum);
			icon = LoadImage (g_hInst, MAKEINTRESOURCE(iconNum), IMAGE_ICON, 32, 32, LR_SHARED|LR_DEFAULTCOLOR);
			SendMessage (ctrl, STM_SETICON, (WPARAM)icon, 0);
			InvalidateRect (ctrl, NULL, FALSE);
			SetWindowLongPtr (hDlg, DWLP_MSGRESULT, 0);
			return TRUE;
		}
		break;

	case WM_COMMAND:
		if (HIWORD(wParam) == BN_CLICKED)
		{
			KillTimer (hDlg, 1);
			EndDialog (hDlg, LOWORD(wParam));
		}
		break;
	}
	return FALSE;
}

//==========================================================================
//
// UploadReport
//
// Starts off the upload by showing the upload dialog.
//
//==========================================================================

static BOOL UploadReport (HANDLE file, bool gzipped)
{
	UploadParmStruct uploadParm = { 0, 0, file, gzipped, UserSummary };
	BOOL res = (BOOL)DialogBoxParam (g_hInst, MAKEINTRESOURCE(IDD_BOING), NULL, (DLGPROC)BoingDlgProc, (LPARAM)&uploadParm);
	if (UserSummary != NULL)
	{
		HeapFree (GetProcessHeap(), 0, UserSummary);
		UserSummary = NULL;
	}
	return res;
}

#endif	// #if 0

//==========================================================================
//
// SaveReport
//
// Makes a permanent copy of the report tarball.
//
//==========================================================================

static void SaveReport (HANDLE file, bool gzipped)
{
	OPENFILENAME ofn = {
#ifdef OPENFILENAME_SIZE_VERSION_400
		OPENFILENAME_SIZE_VERSION_400
#else
		sizeof(ofn)
#endif
		, };
	char filename[256];

	if (gzipped)
	{
		ofn.lpstrFilter = "GZipped Tarball (*.tar.gz)\0*.tar.gz\0";
		strcpy (filename, "CrashReport.tar.gz");
	}
	else
	{
		ofn.lpstrFilter = "Tarball (*.tar)\0*.tar\0";
		strcpy (filename, "CrashReport.tar");
	}
	ofn.lpstrFile = filename;
	ofn.nMaxFile = sizeof(filename);

	while (GetSaveFileName (&ofn))
	{
		HANDLE ofile = CreateFile (ofn.lpstrFile, GENERIC_WRITE, 0, NULL,
			CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL|FILE_FLAG_SEQUENTIAL_SCAN,
			NULL);
		if (ofile == INVALID_HANDLE_VALUE)
		{
			if (MessageBox (NULL, "Could not open the crash report file",
				"Save As failed", MB_RETRYCANCEL) == IDRETRY)
			{
				continue;
			}
			return;
		}
		else
		{
			DWORD fileLen = GetFileSize (file, NULL), fileLeft;
			DWORD bytesCopied = 0;
			char xferbuf[1024];

			SetFilePointer (file, 0, NULL, FILE_BEGIN);
			fileLeft = fileLen;
			while (fileLeft != 0)
			{
				DWORD grab = fileLeft > sizeof(xferbuf) ? sizeof(xferbuf) : fileLeft;
				DWORD didread;

				ReadFile (file, xferbuf, grab, &didread, NULL);
				WriteFile (ofile, xferbuf, didread, &grab, NULL);
				fileLeft -= didread;
			}
			CloseHandle (ofile);
			return;
		}
	}
}

//==========================================================================
//
// DisplayCrashLog
//
// Displays the crash information and possibly submits it. CreateCrashLog()
// must have been called previously.
//
//==========================================================================

void DisplayCrashLog ()
{
	HINSTANCE riched;
	HANDLE file;
	bool gzipped = false;

	if (NumFiles == 0 || (riched = LoadLibrary ("riched20.dll")) == NULL)
	{
		char ohPoo[] =
			"ZDoom crashed but was unable to produce\n"
			"detailed information about the crash.\n"
			"\nThis is all that is available:\n\nCode=XXXXXXXX\nAddr=XXXXXXXX";
		sprintf (ohPoo + sizeof(ohPoo) - 23, "%08lX\nAddr=%p", CrashCode, CrashAddress);
		MessageBox (NULL, ohPoo, "ZDoom Very Fatal Error", MB_OK|MB_ICONSTOP);
		if (WinHlp32 != NULL)
		{
			FreeLibrary (WinHlp32);
		}
	}
	else
	{
		HMODULE uxtheme = LoadLibrary ("uxtheme.dll");
		if (uxtheme != NULL)
		{
			pEnableThemeDialogTexture = (HRESULT (__stdcall *)(HWND,DWORD))GetProcAddress (uxtheme, "EnableThemeDialogTexture");
		}
		INT_PTR result = DialogBox (g_hInst, MAKEINTRESOURCE(IDD_CRASHDIALOG), NULL, (DLGPROC)CrashDlgProc);
		if (result == IDYES)
		{
#if 0	// Server-side support is not done yet
			file = MakeTar (gzipped);
			UploadReport (file, gzipped);
			CloseHandle (file);
#endif
		}
		else if (result == IDC_SAVEREPORT)
		{
			file = MakeTar (gzipped);
			SaveReport (file, gzipped);
			CloseHandle (file);
		}
		FreeLibrary (riched);
		if (uxtheme != NULL)
		{
			FreeLibrary (uxtheme);
		}
	}
	CloseTarFiles ();
}