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/*
             LUFA Library
     Copyright (C) Dean Camera, 2017.

  dean [at] fourwalledcubicle [dot] com
           www.lufa-lib.org
*/

/*
  Copyright 2017  Dean Camera (dean [at] fourwalledcubicle [dot] com)

  Permission to use, copy, modify, distribute, and sell this
  software and its documentation for any purpose is hereby granted
  without fee, provided that the above copyright notice appear in
  all copies and that both that the copyright notice and this
  permission notice and warranty disclaimer appear in supporting
  documentation, and that the name of the author not be used in
  advertising or publicity pertaining to distribution of the
  software without specific, written prior permission.

  The author disclaims all warranties with regard to this
  software, including all implied warranties of merchantability
  and fitness.  In no event shall the author be liable for any
  special, indirect or consequential damages or any damages
  whatsoever resulting from loss of use, data or profits, whether
  in an action of contract, negligence or other tortious action,
  arising out of or in connection with the use or performance of
  this software.
*/

/** \file
 *  \brief LUFA Library Configuration Header File
 *
 *  This header file is used to configure LUFA's compile time options,
 *  as an alternative to the compile time constants supplied through
 *  a makefile.
 *
 *  For information on what each token does, refer to the LUFA
 *  manual section "Summary of Compile Tokens".
 */

#ifndef _LUFA_CONFIG_H_
#define _LUFA_CONFIG_H_

	#if (ARCH == ARCH_AVR8)

		/* Non-USB Related Configuration Tokens: */
//		#define DISABLE_TERMINAL_CODES

		/* USB Class Driver Related Tokens: */
//		#define HID_HOST_BOOT_PROTOCOL_ONLY
//		#define HID_STATETABLE_STACK_DEPTH       {Insert Value Here}
//		#define HID_USAGE_STACK_DEPTH            {Insert Value Here}
//		#define HID_MAX_COLLECTIONS              {Insert Value Here}
//		#define HID_MAX_REPORTITEMS              {Insert Value Here}
//		#define HID_MAX_REPORT_IDS               {Insert Value Here}
//		#define NO_CLASS_DRIVER_AUTOFLUSH

		/* General USB Driver Related Tokens: */
//		#define ORDERED_EP_CONFIG
		#define USE_STATIC_OPTIONS               (USB_DEVICE_OPT_FULLSPEED | USB_OPT_REG_ENABLED | USB_OPT_AUTO_PLL)
		#define USB_DEVICE_ONLY
//		#define USB_HOST_ONLY
//		#define USB_STREAM_TIMEOUT_MS            {Insert Value Here}
//		#define NO_LIMITED_CONTROLLER_CONNECT
//		#define NO_SOF_EVENTS

		/* USB Device Mode Driver Related Tokens: */
//		#define USE_RAM_DESCRIPTORS
		#define USE_FLASH_DESCRIPTORS
//		#define USE_EEPROM_DESCRIPTORS
//		#define NO_INTERNAL_SERIAL
		#define FIXED_CONTROL_ENDPOINT_SIZE      8
		#define DEVICE_STATE_AS_GPIOR            0
		#define FIXED_NUM_CONFIGURATIONS         1
//		#define CONTROL_ONLY_DEVICE
		#define INTERRUPT_CONTROL_ENDPOINT
//		#define NO_DEVICE_REMOTE_WAKEUP
//		#define NO_DEVICE_SELF_POWER

		/* USB Host Mode Driver Related Tokens: */
//		#define HOST_STATE_AS_GPIOR              0
//		#define USB_HOST_TIMEOUT_MS              {Insert Value Here}
//		#define HOST_DEVICE_SETTLE_DELAY_MS	     {Insert Value Here}
//		#define NO_AUTO_VBUS_MANAGEMENT
//		#define INVERTED_VBUS_ENABLE_LINE

	#else

		#error Unsupported architecture for this LUFA configuration file.

	#endif
#endif
.Function.Magic */ .highlight .vc { color: #336699 } /* Name.Variable.Class */ .highlight .vg { color: #dd7700 } /* Name.Variable.Global */ .highlight .vi { color: #3333bb } /* Name.Variable.Instance */ .highlight .vm { color: #336699 } /* Name.Variable.Magic */ .highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */
/*
 * Copyright (C) 2011 Vasilis Tsiligiannis <b_tsiligiannis@silverton.gr>
 *
 * This program 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 2 of the
 * License, or (at your option) any later version.
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libgen.h>
#include <getopt.h>
#include <errno.h>
#include <sys/stat.h>
#include <endian.h>	/* for __BYTE_ORDER */

#if (__BYTE_ORDER == __LITTLE_ENDIAN)
#  define HOST_TO_LE16(x)	(x)
#  define HOST_TO_LE32(x)	(x)
#else
#  define HOST_TO_LE16(x)	bswap_16(x)
#  define HOST_TO_LE32(x)	bswap_32(x)
#endif

struct header
{
    unsigned char sign[4];
    unsigned int start;
    unsigned int flash;
    unsigned char model[4];
    unsigned int size;
} __attribute__ ((packed));

struct finfo
{
    char *name;
    off_t size;
};

struct buf
{
    char *start;
    size_t size;
};

static char *progname;

static void usage(int status)
{
    FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout;

    fprintf(stream, "Usage: %s [OPTIONS...]\n", progname);
    fprintf(stream,
	    "\n"
	    "Options:\n"
	    "  -s <sig>        set image signature to <sig>\n"
	    "  -m <model>      set model to <model>\n"
	    "  -i <file>       read input from file <file>\n"
	    "  -o <file>       write output to file <file>\n"
	    "  -f <flash>      set flash address to <flash>\n"
	    "  -S <start>      set start address to <start>\n");

    exit(status);
}

static int strtou32(char *arg, unsigned int *val)
{
    char *endptr = NULL;

    errno = 0;
    *val = strtoul(arg, &endptr, 0);
    if (errno || (endptr == arg) || (*endptr && (endptr != NULL))) {
	return EXIT_SUCCESS;
    }

    return EXIT_FAILURE;
}

static unsigned short fwcsum (struct buf *buf) {
    int i;
    unsigned short ret = 0;

    for (i = 0; i < buf->size / 2; i++)
	ret -= ((unsigned short *) buf->start)[i];
    
    return ret;
}

static int fwread(struct finfo *finfo, struct buf *buf)
{
    FILE *f;
    
    f = fopen(finfo->name, "r");
    if (!f) {
	fprintf(stderr, "could not open \"%s\" for reading\n", finfo->name);
	usage(EXIT_FAILURE);
    }

    buf->size = fread(buf->start, 1, finfo->size, f);
    if (buf->size != finfo->size) {
	fprintf(stderr, "unable to read from file \"%s\"\n", finfo->name);
	usage(EXIT_FAILURE);
    }

    fclose(f);

    return EXIT_SUCCESS;
}

static int fwwrite(struct finfo *finfo, struct buf *buf)
{
    FILE *f;

    f = fopen(finfo->name, "w");
    if (!f) {
	fprintf(stderr, "could not open \"%s\" for writing\n", finfo->name);
	usage(EXIT_FAILURE);
    }

    buf->size = fwrite(buf->start, 1, finfo->size, f);
    if (buf->size != finfo->size) {
	fprintf(stderr, "unable to write to file \"%s\"\n", finfo->name);
	usage(EXIT_FAILURE);
    }

    fclose(f);

    return EXIT_SUCCESS;
}	
  
int main(int argc, char **argv)
{
    struct stat st;
    struct header header;
    struct buf ibuf, obuf;
    struct finfo ifinfo, ofinfo;
    unsigned short csum;
    int c;

    ifinfo.name = ofinfo.name = NULL;
    header.flash = header.size = header.start = 0;
    progname = basename(argv[0]);

    while((c = getopt(argc, argv, "i:o:m:s:f:S:h")) != -1) {
	switch (c) {
	case 'i':
	    ifinfo.name = optarg;
	    break;
	case 'o':
	    ofinfo.name = optarg;
	    break;
	case 'm':
	    if (strlen(optarg) != 4) {
		fprintf(stderr, "model must be 4 characters long\n");
		usage(EXIT_FAILURE);
	    }
	    memcpy(header.model, optarg, 4);
	    break;
	case 's':
	    if (strlen(optarg) != 4) {
		fprintf(stderr, "signature must be 4 characters long\n");
		usage(EXIT_FAILURE);
	    }
	    memcpy(header.sign, optarg, 4);
	    break;
	case 'h':
	    usage(EXIT_SUCCESS);
	    break;
	case 'f':
	    if (!strtou32(optarg, &header.flash)) {
		fprintf(stderr, "invalid flash address specified\n");
		usage(EXIT_FAILURE);
	    }
	    break;
	case 'S':
	    if (!strtou32(optarg, &header.start)) {
		fprintf(stderr, "invalid start address specified\n");
		usage(EXIT_FAILURE);
	    }
	    break;
	default:
	    usage(EXIT_FAILURE);
	    break;
	}
    }

    if (ifinfo.name == NULL) {
	fprintf(stderr, "no input file specified\n");
	usage(EXIT_FAILURE);
    }

    if (ofinfo.name == NULL) {
	fprintf(stderr, "no output file specified\n");
	usage(EXIT_FAILURE);
    }

    if (stat(ifinfo.name, &st)) {
	fprintf(stderr, "stat failed on %s\n", ifinfo.name);
	usage(EXIT_FAILURE);
    }

    if (header.sign == NULL) {
	fprintf(stderr, "no signature specified\n");
	usage(EXIT_FAILURE);
    }

    if (header.model == NULL) {
	fprintf(stderr, "no model specified\n");
	usage(EXIT_FAILURE);
    }

    if (!header.flash) {
	fprintf(stderr, "no flash address specified\n");
	usage(EXIT_FAILURE);
    }

    if (!header.start) {
	fprintf(stderr, "no start address specified\n");
	usage(EXIT_FAILURE);
    }

    ifinfo.size = st.st_size;

    obuf.size = ifinfo.size + sizeof(struct header) + sizeof(unsigned short);
    if (obuf.size % sizeof(unsigned short))
	obuf.size++;

    obuf.start = malloc(obuf.size);
    if (!obuf.start) {
	fprintf(stderr, "no memory for buffer\n");
	usage(EXIT_FAILURE);
    }
    memset(obuf.start, 0, obuf.size);

    ibuf.size = ifinfo.size;
    ibuf.start = obuf.start + sizeof(struct header);
    
    if (fwread(&ifinfo, &ibuf))
	usage(EXIT_FAILURE);

    header.flash = HOST_TO_LE32(header.flash);
    header.size = HOST_TO_LE32(obuf.size - sizeof(struct header));
    header.start = HOST_TO_LE32(header.start);
    memcpy (obuf.start, &header, sizeof(struct header));

    csum = HOST_TO_LE16(fwcsum(&ibuf));
    memcpy(obuf.start + obuf.size - sizeof(unsigned short),
	   &csum, sizeof(unsigned short));

    ofinfo.size = obuf.size;

    if (fwwrite(&ofinfo, &obuf))
	usage(EXIT_FAILURE);

    return EXIT_SUCCESS;
}