#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>

//DfuSe file definitions !
#define Psignature "DfuSe"
#define Isignature "Target"
#define version 0x01
#define targets 0x01
#define alternate 0x00
#define target_named 0x01
#define target_name

typedef struct Hexlines
{
	int type;
	int adress;
	int lenght;
	int* data;
} Hexline;

int load_file(char *filename);

Hexline parse_hex_line(char *theline, int bytes[], int *addr, int *num, int *code);

void create_tprefix(int size);

void create_dfuprefix(int size);

void create_dfusuffix(void);

uint32_t crc32_byte(uint32_t accum, uint8_t delta);

extern int	memory[65536];		/* the memory is global */

int	memory[65536];				/* the memory is global */

char			image[65536];		/* the memory is global */
char			tprefix[65536];		/* the memory is global */
char			prefix[65536];		/* the memory is global */
char			suffix[65536];		/* the memory is global */
unsigned char	data[65536];		/* the memory is global */

int main(int argc, const char *argv[])
{
	uint32_t crc32 = 0xffffffff;
	int i = 0;
	int total = 0;
	const char *filename;
	char crc_table[4];
	FILE *fhex;

	printf("dfuse file manager\n");
	if (argc < 2)
	{
		printf("too few arguments\n");
		return 0;
	}

	printf("loading the file\n");

	//extracting the image
	filename = argv[1];
	total = load_file((char*)filename);

	create_tprefix(total);
	create_dfuprefix(total);
	create_dfusuffix();

	printf("\nDFU prefix\n");
	for (i = 0; i < 11; i++)
	{
		printf("%02x ", prefix[i]);
		data[i] = prefix[i];
	}

	printf("\nDFU target prefix\n");
	for (i = 0; i < 274; i++)
	{
		printf("%02x ", tprefix[i]);
		data[i + 11] = tprefix[i];
	}

	printf("\nDFU core image of size %d\n", total);
	for (i = 0; i < total + 8; i++)
	{
		printf("%02x ", image[i]);
		data[i + 11 + 274] = image[i];
	}

	printf("\nDFU suffix\n");
	for (i = 0; i < 12; i++)
	{
		printf("%02x ", suffix[i]);
		data[i + 11 + 274 + total + 8] = suffix[i];
	}

	printf("\n dfu image \n");
	for (i = 0; i < 321; i++)
	{
		printf("%02x ", data[i]);
	}

	printf("tutut %d\n", 11 + 274 + total + 8 + 12);

	filename = argv[2];
	fhex = fopen(filename, "wb");

	if (fhex == NULL)
	{
		printf("   Can't open  for writing.\n");
		return 0;
	}

	fwrite(prefix, 11, 1, fhex);
	fwrite(tprefix, 274, 1, fhex);
	fwrite(image, total + 8, 1, fhex);
	fwrite(suffix, 12, 1, fhex);

	/* compute crc */
	for (i = 0; i < total + 11 + 12 + 8 + 274; i++)
		crc32 = crc32_byte(crc32, data[i]);

	crc_table[0] = crc32 & 0xFF;
	crc_table[1] = (crc32 >> 8) & 0xFF;
	crc_table[2] = (crc32 >> 16) & 0xFF;
	crc_table[3] = (crc32 >> 24) & 0xFF;
	fwrite(crc_table, 4, 1, fhex);
	fclose(fhex);
	printf("\nfile crc %08x  \n", crc32);
	return 0;
}

Hexline parse_hex_line(char *theline, int bytes[], int *addr, int *num, int *code)
{
	int sum, len, cksum;
	Hexline ret;
	char *ptr;

	*num = 0;
	if (theline[0] != ':')
		return ret;
	if (strlen(theline) < 11)
		return ret;

	ptr = theline + 1;
	if (!sscanf(ptr, "%02x", &len))
		return ret;

	ptr += 2;
	if (strlen(theline) < (11 + (len * 2)))
		return ret;

	if (!sscanf(ptr, "%04x", addr))
		return ret;

	ptr += 4;
	if (!sscanf(ptr, "%02x", code))
		return ret;
	ptr += 2;
	sum = (len & 255) + ((*addr >> 8) & 255) + (*addr & 255) + (*code & 255);
	printf("  \n DFU image content: %04x %04x ", *addr, len);

	while (*num != len)
	{
		if (!sscanf(ptr, "%02x", &bytes[*num])) return ret;
		printf("%02x", bytes[*num]);
		ptr += 2;
		sum += bytes[*num] & 255;
		(*num)++;
		if (*num >= 256) return ret;
	}

	if (!sscanf(ptr, "%02x", &cksum))
		return ret;
	if (((sum & 255) + (cksum & 255)) & 255)
		return ret; /* checksum error */

	ret.type = *code;
	ret.adress = *addr;
	ret.lenght = len;
	ret.data = bytes;
	return ret;
}

int load_file(char *filename)
{
	char line[1000];
	FILE *fin;
	int addr, n, status, bytes[256];
	Hexline temp;
	int i, j, total = 0, lineno = 1;
	int minaddr = 65536, maxaddr = 0;

	if (strlen(filename) == 0)
	{
		printf("   Can't load a file without the filename.");
		printf("  '?' for help\n");
		return 0;
	}

	fin = fopen(filename, "r");
	if (fin == NULL)
	{
		printf("   Can't open file '%s' for reading.\n", filename);
		return 0;
	}

	while (!feof(fin) && !ferror(fin))
	{
		line[0] = '\0';
		fgets(line, 1000, fin);
		if (line[strlen(line) - 1] == '\n')
			line[strlen(line) - 1] = '\0';
		if (line[strlen(line) - 1] == '\r')
			line[strlen(line) - 1] = '\0';
		temp = parse_hex_line(line, bytes, &addr, &n, &status);

		switch (temp.type)
		{
		case 0:
			for (i = 0; i <= (n - 1); i++)
			{
				memory[addr] = bytes[i] & 255;
				image[addr + 8] = bytes[i] & 255;
				total++;
				if (addr < minaddr)
					minaddr = addr;
				if (addr > maxaddr)
					maxaddr = addr;
				addr++;
			}
			printf("saved\n");
			break;

		case 1:
			fclose(fin);
			printf("   Loaded %04x bytes \n", total);
			image[7] = (total >> 24) & 0xFF;
			image[6] = (total >> 16) & 0xFF;
			image[5] = (total >> 8) & 0xFF;
			image[4] = total & 0xFF;
			printf("image size %02x %02x %02x %02x\n", total & 0xFF, (total >> 8) & 0xFF, (total >> 16) & 0xFF, (total >> 24) & 0xFF);

			return total;
			break;

		case 4:

			printf("\n start of file detected, code starting at adress ");
			for (j = 0; j < temp.lenght; j++)
			{
				printf("%02x", *(temp.data + j));
				image[3 - j] = *(temp.data + j);
			}
			image[0] = 0x00;
			image[1] = 0x00;
			printf("0000\n");
			break;

		default:
			printf("error, bad type code : %d\n", temp.type);
			break;
		}
		lineno++;
	}
	return 0;
}

void create_tprefix(int size)
{
	size = size + 8;
	//szSignature
	tprefix[0] = 'T';
	tprefix[1] = 'a';
	tprefix[2] = 'r';
	tprefix[3] = 'g';
	tprefix[4] = 'e';
	tprefix[5] = 't';

	//bAlternateSetting
	tprefix[6] = alternate;

	//bTargetNamed
	tprefix[7] = target_named;

	//szTargetName
	tprefix[11] = 'S';
	tprefix[12] = 'T';
	tprefix[13] = ' ';
	tprefix[14] = 'H';
	tprefix[15] = 'o';
	tprefix[16] = 'r';
	tprefix[17] = 'n';
	tprefix[18] = 'e';
	tprefix[19] = 't';
	tprefix[20] = ' ';
	tprefix[21] = 'B';
	tprefix[22] = 'o';
	tprefix[23] = 'a';
	tprefix[24] = 'r';
	tprefix[25] = 'd';
	tprefix[26] = ' ';
	tprefix[27] = 'D';
	tprefix[28] = 'F';
	tprefix[29] = 'U';
	tprefix[30] = ' ';
	tprefix[31] = 'F';
	tprefix[32] = 'i';
	tprefix[33] = 'l';
	tprefix[34] = 'e';
	tprefix[35] = ' ';

	//dwTargetSize
	tprefix[266] = size & 0xFF;
	tprefix[267] = (size >> 8) & 0xFF;
	tprefix[268] = (size >> 16) & 0xFF;
	tprefix[269] = (size >> 24) & 0xFF;

	//dwNbElements

	tprefix[270] = 0x01;
	tprefix[271] = 0x00;
	tprefix[272] = 0x00;
	tprefix[273] = 0x00;
}

void create_dfuprefix(int size)
{
	int total = size + 293;

	//szSignature
	prefix[0] = 'D';
	prefix[1] = 'f';
	prefix[2] = 'u';
	prefix[3] = 'S';
	prefix[4] = 'e';

	//bVeersion

	prefix[5] = version;

	//DFUImageSize
	prefix[6] = total & 0xFF;
	prefix[7] = (total >> 8) & 0xFF;
	prefix[8] = (total >> 16) & 0xFF;
	prefix[9] = (total >> 24) & 0xFF;

	//bTargets
	prefix[10] = targets;
}

void create_dfusuffix(void)
{
	//bcdDevice
	suffix[0] = 0x0;
	suffix[1] = 0x0;
	//idProduct
	suffix[2] = 0x0;
	suffix[3] = 0x0;
	//idVendor
	suffix[4] = 0x0;
	suffix[5] = 0x0;
	//bcdDFU
	suffix[6] = 0x1A;
	suffix[7] = 0x01;
	//ucDfuSignature
	suffix[8] = 'U';
	suffix[9] = 'F';
	suffix[10] = 'D';
	//bLength
	suffix[11] = 0x10;
}

unsigned long crc32_table[] =
{
	0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
	0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
	0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
	0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
	0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
	0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
	0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
	0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
	0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
	0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
	0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
	0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
	0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
	0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
	0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
	0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
	0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
	0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
	0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
	0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
	0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
	0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
	0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
	0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
	0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
	0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
	0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
	0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
	0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
	0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
	0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
	0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
	0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
	0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
	0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
	0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
	0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
	0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
	0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
	0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
	0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
	0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
	0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d };

uint32_t crc32_byte(uint32_t accum, uint8_t delta)
{
	return crc32_table[(accum ^ delta) & 0xff] ^ (accum >> 8);
}