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ootp/bcload/bcload.c

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/*
* Copyright (c) 2005 Mark Fullmer
* Copyright (c) 2009 Mark Fullmer and the Ohio State University
* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*
* Ported from ZeitControl bcload.bas and download.bas sample source
*
* $Id: bcload.c 13 2009-11-26 16:37:03Z maf $
*/
#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/errno.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <ctype.h>
#include <string.h>
#include <strings.h>
#include <unistd.h>
#include <fcntl.h>
#include <termios.h>
#include "scr.h"
#include "sccmd.h"
#include "str.h"
#include "xerr.h"
#include "otpsc.h"
#include "otplib.h"
#if defined(__FreeBSD__)
#include <sys/endian.h>
#endif
#if defined(__DARWIN_UNIX03)
#include <sys/_endian.h>
#endif
#define BZS(A) bzero(A, sizeof A);
#define SWAP32(x) x = \
((((x)&0xff)<<24) |\
(((x)&0xff00)<<8) |\
(((x)&0xff0000)>>8) |\
(((x)>>24)&0xff));
#define SWAP16(x) x = \
( (((x)&0xff)<<8) | (((x)&0xff00)>>8) );
static int debug;
void help(void);
struct bcimg {
char *fname;
uint8_t *img_buf, *img_cur, *img_end;
struct stat img_stat;
int verbose;
}; /* bcimg */
void bcimg_open(struct bcimg *bcimg, char *fname, int verbose);
void bcimg_close(struct bcimg *bcimg);
int bcimg_eof(struct bcimg *bcimg);
void bcimg_read_byte(struct bcimg *bcimg, uint8_t *dat);
void bcimg_read_int(struct bcimg *bcimg, uint16_t *dat);
void bcimg_read_long(struct bcimg *bcimg, int32_t *dat);
void bcimg_read_section_name(struct bcimg *bcimg, uint8_t *sname);
void bcimg_read_string(struct bcimg *bcimg, uint8_t **dat, uint32_t len);
void bcimg_skip_to_section(struct bcimg *bcimg, char *section);
void bcimg_read_version_section(struct bcimg *bcimg);
void bcimg_check_card_type(struct bcimg *bcimg, uint8_t *sc_version,
uint8_t sc_version_len);
void bcimg_read_eeprom_section(struct bcimg *bcimg, uint16_t *img_EEAddr,
uint16_t *img_EELen);
int main(int argc, char **argv)
{
struct scr_ctx *scrctx;
struct bcimg bcimg;
uint32_t chunk_start, bytes_left, chunk_working;
int32_t sectionLength;
uint16_t EEStart, EELen, EEChunkSize, img_EEAddr, img_EELen;
uint16_t chunk_start_word;
uint16_t img_nWrites, img_nCRCs, img_EELoadAddr;
uint16_t img_EECRCAddr, img_EECRCLen, img_EECRC, img_SCCRC;
uint8_t img_state, *img_pgmdata, img_EELoadLen, sname[4];
uint8_t sc_EEStart[2], sc_EELen[2], sc_EEAddr[2];
uint8_t sc_state, sc_version[256], sc_version_len, sc_CRC[2];
int i, r;
int list_readers, verbose, paranoid, force_test;
char *reader, *endptr, *c, *img_fname;
/* init xerr */
xerr_setid(argv[0]);
force_test = 0;
paranoid = 1;
debug = 0;
verbose = 0;
reader = SCR_DEFAULT_READER;
list_readers = 0; /* no */
scrctx = (struct scr_ctx*)0L;
img_fname = "HOTPC.IMG";
bzero(&bcimg, sizeof bcimg);
while ((i = getopt(argc, argv, "d:f:hlpr:tv?")) != -1) {
switch (i) {
case 'd':
debug = strtoul(optarg, &endptr, 0);
if (*endptr)
xerr_errx(1, "strtoul(%s): failed at %c.", optarg, *endptr);
break;
case 'f':
img_fname = optarg;
break;
case 'h':
case '?':
help();
exit(0);
break; /* notreached */
case 'l':
list_readers = 1;
break;
case 'p':
paranoid = 0;
break;
case 'r':
reader = optarg;
break;
case 't':
force_test = 1;
break;
case 'v':
verbose = 1;
break;
} /* switch */
} /* while getopt() */
/* create Smart Card context */
if (!(scrctx = scr_ctx_new(SCR_READER_EMBEDDED_ACR30S|SCR_READER_PCSC,
debug))) {
xerr_errx(1, "scr_ctx_new(): failed");
}
/* list availabls SC readers? */
if (list_readers) {
for (i = 0; i < scrctx->num_readers; ++i)
printf("%s\n", scrctx->readers[i]);
goto main_out;
}
/* connect to selected SC reader */
if (scr_ctx_connect(scrctx, reader) < 0)
xerr_errx(1, "scr_ctx_connect(): failed");
/* Get current state of SC */
if ((r = sccmd_BCGetState(scrctx, &sc_state, sc_version,
&sc_version_len)) < 0)
xerr_errx(1, "sccmd_BCGetState(): failed.");
if (r)
xerr_errx(1, "sccmd_BCGetState(): fatal.");
/*
* Enahnced cards have version length of 2, others have an ASCII string.
*
* Only support hardware on hand.
*
*/
if (sc_version_len != 2)
xerr_errx(1, "Firmware loader locked to enhanced cards.");
/*
* all cards with major version 3 are probably okay, be paranoid
* here to avoid bricking hardware
*/
if ((sc_version[0] != 0x3) || (sc_version[1] != 0x9))
xerr_errx(1, "Firmware loader locked to ZC3.9 cards.");
if (sc_state == BC_ESTATE_NEW)
c = BC_STATE_NEW_STR;
else if (sc_state == BC_ESTATE_LOAD)
c = BC_STATE_LOAD_STR;
else if (sc_state == BC_ESTATE_TEST)
c = BC_STATE_TEST_STR;
else if (sc_state == BC_ESTATE_RUN)
c = BC_STATE_RUN_STR;
else
c = "fatal";
if (verbose)
printf("Card/State: ZC%X.%X %s\n", (int)sc_version[0],
(int)sc_version[1], c);
/* a card in state RUN can not be programmed */
if (sc_state == BC_ESTATE_RUN)
xerr_errx(1, "Card in state run, not programmable.");
/*
* The CLEAR EEPROM command must be split into chunks that the card can
* process within its time-out, which is 1.6 seconds if the minor version
* is 1, 2, 3, or 5, otherwise 12.8 seconds
*
*/
if ((sc_version_len == 2) &&
((sc_version[1] <= 3) || (sc_version[1] == 5)))
EEChunkSize = 0x0400;
else
EEChunkSize = 0x2000;
if (verbose)
printf("EEChunkSize=%2.2" PRIx16 "\n", EEChunkSize);
/* all bcimg_* functions will exit on failure */
/* open and read image file to memory, perform sanity checks */
bcimg_open(&bcimg, img_fname, verbose);
/* skip to VERS section */
bcimg_skip_to_section(&bcimg, "VERS");
/* process version information */
bcimg_read_version_section(&bcimg);
/* skip to VMTP section */
bcimg_skip_to_section(&bcimg, "VMTP");
/* verify image file can be downloaded to card */
bcimg_check_card_type(&bcimg, sc_version, sc_version_len);
/* skip to EEPR section */
bcimg_skip_to_section(&bcimg, "EEPR");
/* set enhanced card to LOAD state */
sc_state = BC_ESTATE_LOAD;
if ((r = sccmd_BCSetState(scrctx, sc_state)) < 0)
xerr_errx(1, "sccmd_BCSetState(): failed.");
if (r)
xerr_errx(1, "sccmd_BCSetState(): fatal.");
if (verbose)
printf("BCSetState: load\n");
/* reset SC */
if (scr_ctx_reset(scrctx) < 0)
xerr_errx(1, "scr_ctx_reset(): failed.");
if (verbose)
printf("SC: Reset\n");
/* get SC EEProm size */
if ((r = sccmd_BCEEPromSize(scrctx, sc_EEStart, sc_EELen)) < 0)
xerr_errx(1, "sccmd_BCEEPromSize(): failed.");
if (r)
xerr_errx(1, "sccmd_BCEEPromSize(): fatal.");
EEStart = ((uint16_t)sc_EEStart[0]<<8) | sc_EEStart[1];
EELen = ((uint16_t)sc_EELen[0]<<8) | sc_EELen[1];
if (verbose)
printf("EEStart=%2.2" PRIx16 ",EELen=%2.2" PRIx16 "\n", EEStart, EELen);
/* read the EEPROM section of the image file */
bcimg_read_eeprom_section(&bcimg, &img_EEAddr, &img_EELen);
if (verbose)
printf("imgAddr=%2.2" PRIx16 ",imgLen=%2.2" PRIx16 "\n",
img_EEAddr, img_EELen);
if ((img_EEAddr != EEStart) || (img_EELen != EELen))
xerr_errx(1, "EEProm image area on SC and image file mismatch.");
/*
* erase EEProm on SC. Break work into chunks if necessary.
*/
chunk_start = img_EEAddr;
chunk_start_word = chunk_start & 0x0000FFFF;
bytes_left = img_EELen;
while (bytes_left) {
chunk_working = bytes_left;
if (chunk_working > EEChunkSize)
chunk_working = EEChunkSize;
if (verbose)
printf("Clear: addr=%2.2" PRIx16 ",len=%2.2" PRIx32 "\n",
chunk_start_word, chunk_working);
sc_EEAddr[0] = (chunk_start_word&0xFF00)>>8;
sc_EEAddr[1] = (chunk_start_word&0x00FF);
sc_EELen[0] = (chunk_working&0xFF00)>>8;
sc_EELen[1] = (chunk_working&0x00FF);
if ((r = sccmd_BCClearEEProm(scrctx, sc_EEAddr, sc_EELen)) < 0)
xerr_errx(1, "sccmd_BCClearEEprom(): failed.");
if (r)
xerr_errx(1, "sccmd_BCClearEEProm(): fatal.");
if (verbose)
printf("BCClearEEProm: success\n");
chunk_start += chunk_working;
bytes_left -= chunk_working;
chunk_start_word = chunk_start & 0x0000FFFF;
} /* erase flash */
/* reset SC */
if (scr_ctx_reset(scrctx) < 0)
xerr_errx(1, "scr_ctx_reset(): failed.");
if (verbose)
printf("SC: Reset\n");
/* skip to LOAD section */
bcimg_skip_to_section(&bcimg, "LOAD");
bcimg_read_section_name(&bcimg, sname);
/* LOAD section length */
bcimg_read_long(&bcimg, &sectionLength);
if (sectionLength < 5)
xerr_errx(1, "Fatal: LOAD sectionLength < 5");
/* state of card after programming */
bcimg_read_byte(&bcimg, &img_state);
-- sectionLength;
/* number of writes to download image */
bcimg_read_int(&bcimg, &img_nWrites);
sectionLength -= 2;
/* number of sections to compute CRC on */
bcimg_read_int(&bcimg, &img_nCRCs);
sectionLength -= 2;
/*
* program the image in chunks set by image file
*/
while (img_nWrites != 0) {
img_nWrites -= 1;
bcimg_read_int(&bcimg, &img_EELoadAddr);
bcimg_read_byte(&bcimg, &img_EELoadLen);
if (sectionLength < (img_EELoadLen+3))
xerr_errx(1, "Fatal: LOAD/writing sectionLength=%" PRId32 \
" < img_EELoadLen+3=%" PRId8, sectionLength, img_EELoadLen+3);
sectionLength -= (img_EELoadLen+3);
bcimg_read_string(&bcimg, &img_pgmdata, (uint32_t)img_EELoadLen);
sc_EEAddr[0] = (img_EELoadAddr&0xFF00)>>8;
sc_EEAddr[1] = (img_EELoadAddr&0x00FF);
sc_EELen[0] = img_EELoadLen;
if (verbose)
printf("EEWRITE: nWrites=%" PRIu16 ",addr=%" PRIx16 ",len=%" PRIx8 "\n",
img_nWrites, img_EELoadAddr, img_EELoadLen);
if ((r = sccmd_BCWriteEEProm(scrctx, sc_EEAddr, sc_EELen,
img_pgmdata)) < 0)
xerr_errx(1, "sccmd_BCWriteEEProm(): failed.");
if (r)
xerr_errx(1, "sccmd_BCWriteEEProm(): fatal.");
} /* img_nWrites */
/*
* get CRC's of image file and compare to those computed by the SC
*/
while (img_nCRCs != 0) {
img_nCRCs -= 1;
if (sectionLength < 6)
xerr_errx(1, "Fatal: LOAD/CRC sectionLength < 6");
sectionLength -= 6;
bcimg_read_int(&bcimg, &img_EECRCAddr);
bcimg_read_int(&bcimg, &img_EECRCLen);
bcimg_read_int(&bcimg, &img_EECRC);
if (verbose)
printf("EECRC: nWrites=%" PRIu16",addr=%2.2" PRIx16 ",len=%2.2" PRIx16 ",imgCRC=%2.2" PRIx16 "\n",
img_nCRCs, img_EECRCAddr, img_EECRCLen, img_EECRC);
sc_EEAddr[0] = (img_EECRCAddr&0xFF00)>>8;
sc_EEAddr[1] = (img_EECRCAddr&0x00FF);
sc_EELen[0] = (img_EECRCLen&0xFF00)>>8;
sc_EELen[1] = (img_EECRCLen&0x00FF);
if ((r = sccmd_BCEEPromCRC(scrctx, sc_EEAddr, sc_EELen, sc_CRC)) < 0)
xerr_errx(1, "sccmd_BCEEPromCRC(): failed.");
img_SCCRC = (uint16_t)sc_CRC[0]<<8 | sc_CRC[1];
if (r)
xerr_errx(1, "sccmd_BCEEPromCRC(): fatal.");
if (verbose)
printf("EECRC: SCCRC=%" PRIx16 "\n", img_SCCRC);
if (img_SCCRC != img_EECRC)
xerr_errx(1, "CRC: failed.");
} /* img_nCRCs */
/* all bytes in image file should be consumed */
if (!bcimg_eof(&bcimg))
xerr_errx(1, "Fatal, trailing bytes after EEProm CRC.");
/* force card more to TEST via command line? */
if (force_test)
sc_state = BC_ESTATE_TEST;
else
sc_state = img_state;
/* set SC state */
if ((r = sccmd_BCSetState(scrctx, sc_state)) < 0)
xerr_errx(1, "sccmd_BCSetState(): failed.");
if (r)
xerr_errx(1, "sccmd_BCSetState(): fatal.");
if (verbose) {
if (sc_state == BC_ESTATE_NEW)
c = BC_STATE_NEW_STR;
else if (sc_state == BC_ESTATE_LOAD)
c = BC_STATE_LOAD_STR;
else if (sc_state == BC_ESTATE_TEST)
c = BC_STATE_TEST_STR;
else if (sc_state == BC_ESTATE_RUN)
c = BC_STATE_RUN_STR;
else
c = "fatal";
printf("BCSetState: %s\n", c);
}
/* reset SC one last time */
if (scr_ctx_reset(scrctx) < 0)
xerr_errx(1, "scr_ctx_reset(): failed.");
if (verbose)
printf("SC: Reset\n");
main_out:
scr_ctx_free(scrctx);
bcimg_close(&bcimg);
exit (0);
} /* main */
void help(void)
{
fprintf(stderr, "bcload [hlptv?] [-d debug_level] [-f fname] [-r reader]\n");
fprintf(stderr, " -h : help\n");
fprintf(stderr, " -l : list SC readers\n");
fprintf(stderr, " -t : force to TEST state\n");
} /* help */
void bcimg_open(struct bcimg *bcimg, char *fname, int verbose)
{
int32_t fileLength;
int fd, n;
bzero(bcimg, sizeof *bcimg);
bcimg->verbose = verbose;
n = strlen(fname);
if (!(bcimg->fname = (char*)malloc(n+1)))
xerr_err(1, "malloc(%s)", fname);
strcpy(bcimg->fname, fname);
if (stat(fname, &bcimg->img_stat) < 0)
xerr_err(1, "stat(%s)", bcimg->fname);
if (!(bcimg->img_buf = (uint8_t*)malloc(bcimg->img_stat.st_size)))
xerr_err(1, "malloc(%" PRId64 ")", (int64_t)bcimg->img_stat.st_size);
if ((fd = open(bcimg->fname, O_RDONLY)) < 0)
xerr_err(1, "open(%s)", bcimg->fname);
if (read(fd, bcimg->img_buf, bcimg->img_stat.st_size) !=
bcimg->img_stat.st_size)
xerr_err(1, "read(%s)", bcimg->fname);
if (close(fd) < 0)
xerr_err(1, "close(%s)", bcimg->fname);
bcimg->img_cur = bcimg->img_buf;
bcimg->img_end = bcimg->img_cur + bcimg->img_stat.st_size;
/* check signature */
if (bcmp(bcimg->img_cur, "ZCIF", 4) && bcmp(bcimg->img_cur, "ZCDF", 4))
xerr_errx(1, "%s: signature failed", bcimg->fname);
/* consume signature */
bcimg->img_cur += 4;
/* read file length */
bcimg_read_long(bcimg, &fileLength);
if ((fileLength+4+4) != bcimg->img_stat.st_size)
xerr_errx(1, "%s: stored size %" PRIu32 " != file size %" PRIu64,
bcimg->fname, fileLength+4+4, (uint64_t)bcimg->img_stat.st_size);
} /* bcimg_open */
void bcimg_close(struct bcimg *bcimg)
{
if (!bcimg)
xerr_errx(1, "bcimg invalid");
if (bcimg->fname)
free (bcimg->fname);
if (bcimg->img_buf)
free (bcimg->img_buf);
} /* bcimg_close */
int bcimg_eof(struct bcimg *bcimg)
{
if (bcimg->img_cur == bcimg->img_end)
return 1;
return 0;
} /* bcimg_eof */
void bcimg_read_section_name(struct bcimg *bcimg, uint8_t *sname)
{
if (bcimg->img_cur+4 > bcimg->img_end)
xerr_errx(1, "bcimg_read_section_name(): seek past EOF");
sname[0] = *bcimg->img_cur++;
sname[1] = *bcimg->img_cur++;
sname[2] = *bcimg->img_cur++;
sname[3] = *bcimg->img_cur++;
} /* bcimg_read_section_name */
void bcimg_read_byte(struct bcimg *bcimg, uint8_t *dat)
{
if (bcimg->img_cur > bcimg->img_end)
xerr_errx(1, "bcimg_read_byte(): seek past EOF");
*dat = *bcimg->img_cur++;
} /* bcimg_readbyte */
void bcimg_read_int(struct bcimg *bcimg, uint16_t *dat)
{
if (bcimg->img_cur+2 > bcimg->img_end)
xerr_errx(1, "bcimg_read_int(): seek past EOF");
*dat = (uint16_t)*(bcimg->img_cur)<<8 | *(bcimg->img_cur+1);
bcimg->img_cur += 2;
#if BYTE_ORDER == LITTLE_ENDIAN
SWAP16(*dat)
#endif
} /* bcimg_read_int */
void bcimg_read_long(struct bcimg *bcimg, int32_t *dat)
{
if (bcimg->img_cur+4 > bcimg->img_end)
xerr_errx(1, "bcimg_read_long(): seek past EOF");
*dat = (uint32_t)*(bcimg->img_cur)<<24 | (uint32_t)*(bcimg->img_cur+1)<<16 |
(uint32_t)*(bcimg->img_cur+2)<<8 | *(bcimg->img_cur+3);
bcimg->img_cur += 4;
#if BYTE_ORDER == LITTLE_ENDIAN
SWAP32(*dat)
#endif
} /* bcimg_read_long */
void bcimg_read_string(struct bcimg *bcimg, uint8_t **dat, uint32_t len)
{
if (bcimg->img_cur+len > bcimg->img_end)
xerr_errx(1, "bcimg_read_string(): seek past EOF");
*dat = bcimg->img_cur;
bcimg->img_cur += len;
} /* bcimg_read_string */
void bcimg_skip_to_section(struct bcimg *bcimg, char *section)
{
int32_t sectionLength;
while (1) {
if (bcimg->img_cur+4 > bcimg->img_end)
xerr_errx(1, "bcimg_skip_to_section(): seek past EOF @ name.");
/* requested section? */
if (!bcmp(bcimg->img_cur, section, 4))
return;
if (bcimg->verbose)
printf("Skipping section %c%c%c%c\n",
*bcimg->img_cur, *(bcimg->img_cur+1), *(bcimg->img_cur+2),
*(bcimg->img_cur+3));
/* skip to section length */
bcimg->img_cur += 4;
if (bcimg->img_cur+4 > bcimg->img_end)
xerr_errx(1, "bcimg_skip_to_section(): seek past EOF @ len.");
/* section length */
bcimg_read_long(bcimg, &sectionLength);
if (bcimg->img_cur+sectionLength > bcimg->img_end)
xerr_errx(1, "bcimg_skip_to_section(): seek past EOF @ len.");
bcimg->img_cur += sectionLength;
} /* skipping sections */
} /* bcimg_skip_to_section */
void bcimg_read_version_section(struct bcimg *bcimg)
{
int32_t sectionLength;
uint8_t *version;
/* skip "VERS" */
bcimg->img_cur += 4;
bcimg_read_long(bcimg, &sectionLength);
if (sectionLength == 2)
xerr_errx(1, "bcimg_read_version_section(): Obsolete image file.");
if (sectionLength != 4)
xerr_errx(1, "bcimg_read_version_section(): Bad image file.");
bcimg_read_string(bcimg, &version, 4);
/*
* first two bytes are version of compiler which created file.
* Must be greater than 5.07
*/
if ((version[0] < 5) || ((version[0] == 5) && (version[1] < 7)))
xerr_errx(1, "bcimg_read_version_section(): Obselete image file.");
/*
* next two bytes are version number of oldest software that
* can read the image file. Must be > 5.22
*/
if ((version[2] > 5) || ((version[2] == 5) && (version[3] > 22)))
xerr_errx(1, "bcimg_read_version_section(): Unknown image file version.");
} /* bcimg_read_version_section */
void bcimg_check_card_type(struct bcimg *bcimg, uint8_t *sc_version,
uint8_t sc_version_len)
{
int32_t sectionLength;
uint8_t *imgCardType;
/* skip "VMTP" */
bcimg->img_cur += 4;
bcimg_read_long(bcimg, &sectionLength);
bcimg_read_string(bcimg, &imgCardType, sectionLength);
if (imgCardType[0] == 0)
xerr_errx(1,
"bcimg_check_card_type(): Error, Image contains terminal program");
if ((sc_version_len == 2) && (sectionLength == 2) &&
(sc_version[0] == imgCardType[0]) &&
(sc_version[1] == imgCardType[1]))
return; /* success */
xerr_errx(1, "bcimg_check_card_type(): Image and SC do not match.");
} /* bcimg_check_card_type */
void bcimg_read_eeprom_section(struct bcimg *bcimg, uint16_t *img_EEAddr,
uint16_t *img_EELen)
{
int32_t sectionLength;
/* skip "EEPR" */
bcimg->img_cur += 4;
bcimg_read_long(bcimg, &sectionLength);
if (sectionLength < 4)
xerr_errx(1, "read_eeprom_section(): sectionLength < 4");
bcimg_read_int(bcimg, img_EEAddr);
bcimg_read_int(bcimg, img_EELen);
sectionLength -= 4;
/* skip to next section */
if ((bcimg->img_cur + sectionLength) > bcimg->img_end)
xerr_errx(1, "bcimg_read_eeprom_section(): seek past EOF @ skip.");
bcimg->img_cur += sectionLength;
} /* bcimg_read_eeprom_section */
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