Function fxInstallFragment

tools/serial2xsbug/serial2xsbug.c:839–880

erases first block and writes gInstallFragmentSize bytes of header skips kInstallSkipFragmentSize bytes writes remaining for data backs up to offset 0 and writes the kInstallSkipFragmentSize bytes skipped this ensures that the mod header is only valid if all bytes are received @@ add GET VERSION

// this ensures that the mod header is only valid if all bytes are received
//@@ add GET VERSION
void fxInstallFragment(txSerialTool self)
{
	char preamble[32];
	char *out = malloc(gInstallFragmentSize + 16);
	int use = (0 == gInstallOffset) ? kInstallInitialFragmentSize : gInstallFragmentSize;
	uint8_t id = 0xe0;

	fseek(gInstallFD, gInstallOffset, SEEK_SET);
	use = fread(out + 9, 1, use, gInstallFD);
	if (0 == use) {
		if (self->traceCommands)
			fprintf(stderr, "### update install header\n");
		gInstallOffset = kInstallInitialFragmentSize;
		fseek(gInstallFD, gInstallOffset, SEEK_SET);
		use = fread(out + 9, 1, kInstallSkipFragmentSize, gInstallFD);
		id = 0xe8;
	}

	if (self->traceCommands)
		fprintf(stderr, "### install fragment @ %d size %d\n", gInstallOffset, use);

	sprintf(preamble, "\r\n<?xs#%8.8X?>", self->currentMachine->value);
	fxWriteSerial(self, preamble, strlen(preamble));
	
	out[0] = ((use + 7) >> 8) & 0xff;		// length high
	out[1] = (use + 7) & 0xff;		// length low
	out[2] = 3;		// install cmd
	out[3] = id;	// id high
	out[4] = id;	// id low
	out[5] = (gInstallOffset >> 24) & 255;
	out[6] = (gInstallOffset >> 16) & 255;
	out[7] = (gInstallOffset >> 8) & 255;
	out[8] = gInstallOffset & 255;

	fxWriteSerial(self, out, use + 4 + 5);

	if (0 == gInstallOffset)
		gInstallOffset += kInstallSkipFragmentSize;
	gInstallOffset += use;

	free(out);
}

int mapHex(char c)
{