/* * Parser/loader for IHEX formatted data. * * Copyright © 2008 David Woodhouse <dwmw2@infradead.org> * Copyright © 2005 Jan Harkes <jaharkes@cs.cmu.edu> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <stdint.h>#include <arpa/inet.h>#include <stdio.h>#include <errno.h>#include <sys/types.h>#include <sys/stat.h>#include <sys/mman.h>#include <fcntl.h>#include <string.h>#include <unistd.h>#include <stdlib.h>#define _GNU_SOURCE#include <getopt.h>  struct ihex_binrec {	struct ihex_binrec *next; /* not part of the real data structure */        uint32_t addr;        uint16_t len;        uint8_t data[];}; /** * nybble/hex are little helpers to parse hexadecimal numbers to a byte value **/static uint8_t nybble(const uint8_t n){       if      (n >= '0' && n <= '9') return n - '0';       else if (n >= 'A' && n <= 'F') return n - ('A' - 10);       else if (n >= 'a' && n <= 'f') return n - ('a' - 10);       return 0;} static uint8_t hex(const uint8_t *data, uint8_t *crc){       uint8_t val = (nybble(data[0]) << 4) | nybble(data[1]);       *crc += val;       return val;} static int process_ihex(uint8_t *data, ssize_t size);static void file_record(struct ihex_binrec *record);static int output_records(int outfd); static int sort_records = 0;static int wide_records = 0; int usage(void){	fprintf(stderr, "ihex2fw: Convert ihex files into binary "		"representation for use by Linux kernel\n");	fprintf(stderr, "usage: ihex2fw [<options>] <src.HEX> <dst.fw>\n");	fprintf(stderr, "       -w: wide records (16-bit length)\n");	fprintf(stderr, "       -s: sort records by address\n");	return 1;} int main(int argc, char **argv){	int infd, outfd;	struct stat st;	uint8_t *data;	int opt; 	while ((opt = getopt(argc, argv, "ws")) != -1) {		switch (opt) {		case 'w':			wide_records = 1;			break;		case 's':			sort_records = 1;			break;		default:			return usage();		}	} 	if (optind + 2 != argc)		return usage(); 	if (!strcmp(argv[optind], "-"))	    infd = 0;	else		infd = open(argv[optind], O_RDONLY);	if (infd == -1) {		fprintf(stderr, "Failed to open source file: %s",			strerror(errno));		return usage();	}	if (fstat(infd, &st)) {		perror("stat");		return 1;	}	data = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, infd, 0);	if (data == MAP_FAILED) {		perror("mmap");		return 1;	} 	if (!strcmp(argv[optind+1], "-"))	    outfd = 1;	else		outfd = open(argv[optind+1], O_TRUNC|O_CREAT|O_WRONLY, 0644);	if (outfd == -1) {		fprintf(stderr, "Failed to open destination file: %s",			strerror(errno));		return usage();	}	if (process_ihex(data, st.st_size))		return 1; 	output_records(outfd);	return 0;} static int process_ihex(uint8_t *data, ssize_t size){	struct ihex_binrec *record;	uint32_t offset = 0;	uint8_t type, crc = 0, crcbyte = 0;	int i, j;	int line = 1;	int len; 	i = 0;next_record:	/* search for the start of record character */	while (i < size) {		if (data[i] == '\n') line++;		if (data[i++] == ':') break;	} 	/* Minimum record length would be about 10 characters */	if (i + 10 > size) {		fprintf(stderr, "Can't find valid record at line %d\n", line);		return -EINVAL;	} 	len = hex(data + i, &crc); i += 2;	if (wide_records) {		len <<= 8;		len += hex(data + i, &crc); i += 2;	}	record = malloc((sizeof (*record) + len + 3) & ~3);	if (!record) {		fprintf(stderr, "out of memory for records\n");		return -ENOMEM;	}	memset(record, 0, (sizeof(*record) + len + 3) & ~3);	record->len = len; 	/* now check if we have enough data to read everything */	if (i + 8 + (record->len * 2) > size) {		fprintf(stderr, "Not enough data to read complete record at line %d\n",			line);		return -EINVAL;	} 	record->addr  = hex(data + i, &crc) << 8; i += 2;	record->addr |= hex(data + i, &crc); i += 2;	type = hex(data + i, &crc); i += 2; 	for (j = 0; j < record->len; j++, i += 2)		record->data[j] = hex(data + i, &crc); 	/* check CRC */	crcbyte = hex(data + i, &crc); i += 2;	if (crc != 0) {		fprintf(stderr, "CRC failure at line %d: got 0x%X, expected 0x%X\n",			line, crcbyte, (unsigned char)(crcbyte-crc));		return -EINVAL;	} 	/* Done reading the record */	switch (type) {	case 0:		/* old style EOF record? */		if (!record->len)			break; 		record->addr += offset;		file_record(record);		goto next_record; 	case 1: /* End-Of-File Record */		if (record->addr || record->len) {			fprintf(stderr, "Bad EOF record (type 01) format at line %d",				line);			return -EINVAL;		}		break; 	case 2: /* Extended Segment Address Record (HEX86) */	case 4: /* Extended Linear Address Record (HEX386) */		if (record->addr || record->len != 2) {			fprintf(stderr, "Bad HEX86/HEX386 record (type %02X) at line %d\n",				type, line);			return -EINVAL;		} 		/* We shouldn't really be using the offset for HEX86 because		 * the wraparound case is specified quite differently. */		offset = record->data[0] << 8 | record->data[1];		offset <<= (type == 2 ? 4 : 16);		goto next_record; 	case 3: /* Start Segment Address Record */	case 5: /* Start Linear Address Record */		if (record->addr || record->len != 4) {			fprintf(stderr, "Bad Start Address record (type %02X) at line %d\n",				type, line);			return -EINVAL;		} 		/* These records contain the CS/IP or EIP where execution		 * starts. Don't really know what to do with them. */		goto next_record; 	default:		fprintf(stderr, "Unknown record (type %02X)\n", type);		return -EINVAL;	} 	return 0;} static struct ihex_binrec *records; static void file_record(struct ihex_binrec *record){	struct ihex_binrec **p = &records; 	while ((*p) && (!sort_records || (*p)->addr < record->addr))		p = &((*p)->next); 	record->next = *p;	*p = record;} static int output_records(int outfd){	unsigned char zeroes[6] = {0, 0, 0, 0, 0, 0};	struct ihex_binrec *p = records; 	while (p) {		uint16_t writelen = (p->len + 9) & ~3; 		p->addr = htonl(p->addr);		p->len = htons(p->len);		write(outfd, &p->addr, writelen);		p = p->next;	}	/* EOF record is zero length, since we don't bother to represent	   the type field in the binary version */	write(outfd, zeroes, 6);	return 0;}