/*?@（#）btcflash.c	1.18?17/07/15?2004-2017?J.?Schilling?*/
#ifndef?lint
static	const?char?_sccsid[]?=
	“@（#）btcflash.c	1.18?17/07/15?2004-2017?J.?Schilling“;
#endif
/*--------------------------------------------------------------------------*/
/*
?*?Firmware?flash?utility?for?BTC?DRW1008?DVD+/-RW?recorder
?*?Version?2004/04/29
?*?By?David?Huang?
?*?This?work?is?dedicated?to?the?public?domain
?*
?*?This?utility?may?also?work?with?other?BTC?DVD?recorders?such?as
?*?the?DRW1004?and?DRW1108?but?they?have?not?been?tested.
?*
?*?USE?AT?YOUR?OWN?RISK!
?*?btcflash?is?provided?AS?IS?with?NO?WARRANTY?either?expressed?or?implied.
?*
?*?Firmware?files?may?be?obtained?by?running?BTC‘s?Windows?flash
?*?utility?then?searching?in?the?WINDOWS\TEMP?or?WINNT\TEMP?directory
?*?for?a?*.HEX?file.?It?will?probably?be?in?a?subdirectory?named
?*?PAC*.tmp.DIR?and?the?HEX?file?will?be?named?Vnnnn.HEX?where?nnnn
?*?is?the?firmware?version?number.?You‘ll?also?find?IDEFLASH.EXE?or
?*?BTCFLASH.EXE?in?the?same?directory.
?*
?*?This?utility?will?also?accept?firmware?files?in?“.BIN“?format.
?*/

#ifdef	DO_INCLUDE
#include?
#include?
#include?
#include?
#endif

#define	FLASHSIZE	0x100000	/*?BTC?flash?is?1MB?*/

EXPORT	unsigned?char?	*loadfirmware?__PR（（const?char?*））;
LOCAL	int		getbyte		__PR（（char?**））;
LOCAL	unsigned?short	calcsum		__PR（（unsigned?char?*））;
LOCAL	int		btcmain		__PR（（SCSI?*scgp?const?char?*fwfile））;


EXPORT?unsigned?char?*
loadfirmware（firmware）
	const?char?*	firmware;
{
	FILE		*f;
	char		line[80];
	char		*p;
	unsigned?char	*fwbuf;
	int		bank;
	int		length;
	int		offset;
	int		type;
	int		hexsum;
	int		i;
	int		b;

	fwbuf?=?malloc（FLASHSIZE）;
	if?（!fwbuf）?{
		fprintf（stderr?_（“Could?not?allocate?memory?for?firmware\n“））;
		return?（NULL）;
	}

	f?=?fopen（firmware?“r“）;
	if?（!f）?{
		fprintf（stderr?_（“%s:?Unable?to?open:?“）?firmware）;
		perror（NULL）;
		free（fwbuf）;
		return?（NULL）;
	}

	/*
	?*?Get?length?of?file.?If?it‘s?exactly?FLASHSIZE?assume?it‘s?a
	?*?.bin?file.?Otherwise?try?to?read?it?as?a?.hex?file.
	?*/
	fseek（f?0?SEEK_END）;
	if?（ftell（f）?==?FLASHSIZE）?{
		rewind（f）;
		if?（fread（fwbuf?1?FLASHSIZE?f）?!=?FLASHSIZE）?{
			fprintf（stderr?_（“%s:?Short?read\n“）?firmware）;
			fclose（f）;
			free（fwbuf）;
			return?（NULL）;
		}
		fclose（f）;
		return?（fwbuf）;
	}

	rewind（f）;
	memset（fwbuf?0xff?FLASHSIZE）;

	bank?=?0;
	while?（fgets（line?sizeof?（line）?f））?{
		if?（line[0]?!=?‘:‘）
			continue;

		p?=?line?+?1;

		length?=?getbyte（&p）;
		offset?=?getbyte（&p）?<		type?=?getbyte（&p）;
		if?（length?		????（type?!=?0?&&?length?!=?0））?{
			errmsgno（EX_BAD?_（“Malformed?line:?%.79s\n“）?line）;
			fclose（f）;
			free（fwbuf）;
			return?（NULL）;
		}?else?if?（length?==?0）?{
			if?（strncmp（line?“:00000155AA“?11）?==?0）?{
				if?（++bank?>=?16）?{
					errmsgno（EX_BAD
					????_（“Firmware?file?larger?than?1MB\n“））;
					fclose（f）;