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ihex.c
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ihex.c
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/*-
* Copyright (c) 2016 Iain Hibbert
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <err.h>
#include <unistd.h>
#include <util.h>
#include "bcmfw.h"
static uint8_t inbuf[1024];
static uint8_t * inptr;
static ssize_t inmax;
static int infd;
static uint8_t cksum;
/*
* Read 'Intel HEX' file, lines in the format:
*
* :<Count><Addr><Type><Data1><Data2>...<DataN><Checksum>\r\n
*
* <Count>: 2 digits, the number of data bytes in the line
* <Addr>: 4 digits, the address to write the data
* <Type>: 2 digits, indicating the record type
* <Data>: <Count> * 2 digits of data
* <Checksum>: 2 digits, to validate the line
*
* all digits are hexadecimal
*
* Also see: https://en.wikipedia.org/wiki/Intel_HEX
*/
static char
read_char(void)
{
if (inptr - inbuf == inmax) {
inmax = read(infd, inbuf, sizeof(inbuf));
inptr = inbuf;
if (inmax == 0)
return 0;
if (inmax == -1)
err(EXIT_FAILURE, "read");
}
return *inptr++;
}
static inline uint8_t
read_digit(void)
{
char ch = read_char();
if ('0' <= ch && ch <= '9')
return ch - '0';
if ('a' <= ch && ch <= 'f')
return ch - 'a' + 0xa;
if ('A' <= ch && ch <= 'F')
return ch - 'A' + 0xa;
if (ch == '\r' || ch == '\n')
errx(EXIT_FAILURE, "unexpected EOL");
if (ch == 0)
errx(EXIT_FAILURE, "unexpected EOF");
errx(EXIT_FAILURE, "invalid hex digit");
}
static inline uint8_t
read_byte(void)
{
uint8_t v;
v = (read_digit() << 4) + read_digit();
cksum += v;
return v;
}
struct ihex *
read_ihex(const char *infile)
{
struct ihex *head, *block, *prev;
uint32_t base;
uint16_t addr;
uint8_t type, count;
uint8_t data[UINT8_MAX];
char ch;
int i;
infd = open(infile, O_RDONLY);
if (infd == -1)
return NULL;
inptr = inbuf;
inmax = 0;
cksum = 0;
head = NULL;
prev = NULL;
base = 0;
ch = read_char();
for(;;) {
if (ch != ':')
errx(EXIT_FAILURE, "no start code");
count = read_byte();
addr = (read_byte() << 8) + read_byte();
type = read_byte();
for (i = 0; i < count; i++)
data[i] = read_byte();
(void)read_byte(); /* this byte ensures cksum == 0 */
if (cksum != 0)
errx(EXIT_FAILURE, "checksum mismatch");
while ((ch = read_char()) == '\r' || ch == '\n')
;
switch (type) {
case 0x00: /* Data */
block = emalloc(sizeof(struct ihex));
if (count + sizeof(uint32_t) > UINT8_MAX)
errx(EXIT_FAILURE, "ihex block too large");
le32enc(block->data, base + addr);
memcpy(block->data + sizeof(uint32_t), data, count);
block->count = count + sizeof(uint32_t);
block->next = NULL;
if (head == NULL)
head = block;
if (prev != NULL)
prev->next = block;
prev = block;
if (verbose > 1) {
printf(" Data address 0x%08x, count %u",
le32dec(block->data), block->count);
for (i = 4; i < block->count; i++) {
printf("%s %02x",
(((i - 4) % 16) ? "" : "\n "),
block->data[i]);
}
printf("\n");
}
break;
case 0x01: /* End of File */
if (count != 0)
errx(EXIT_FAILURE, "EOF: invalid data");
if (ch != 0)
errx(EXIT_FAILURE, "EOF: not end of file");
close(infd);
if (verbose > 1) {
printf("\n");
}
return head;
case 0x04: /* Extended Linear Address */
if (count != 2)
errx(EXIT_FAILURE, "ELA: invalid data");
base = (data[0] << 24) + (data[1] << 16);
if (verbose > 1) {
printf(" Extended Linear Address 0x%08x\n", base);
}
break;
case 0x02: /* Extended Segment Address */
case 0x03: /* Start Segment Address */
case 0x05: /* Start Linear Address */
default:
warnx("unhandled record type 0x%02x\n", type);
break;
}
}
}