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/*
* omfdump.c
*
* Very simple program to dump the contents of an OMF (OBJ) file
*
* This assumes a littleendian, unaligned-load-capable host and a
* C compiler which handles basic C99.
*/
#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <ctype.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>
const char *progname;
static const char *record_types[256] =
{
[0x80] = "THEADR",
[0x82] = "LHEADR",
[0x88] = "COMENT",
[0x8a] = "MODEND16",
[0x8b] = "MODEND32",
[0x8c] = "EXTDEF",
[0x90] = "PUBDEF16",
[0x91] = "PUBDEF32",
[0x94] = "LINNUM16",
[0x95] = "LINNUM32",
[0x96] = "LNAMES",
[0x98] = "SEGDEF16",
[0x99] = "SEGDEF32",
[0x9a] = "GRPDEF",
[0x9c] = "FIXUPP16",
[0x9d] = "FIXUPP32",
[0xa0] = "LEDATA16",
[0xa1] = "LEDATA32",
[0xa2] = "LIDATA16",
[0xa3] = "LIDATA32",
[0xb0] = "COMDEF",
[0xb2] = "BAKPAT16",
[0xb3] = "BAKPAT32",
[0xb4] = "LEXTDEF",
[0xb6] = "LPUBDEF16",
[0xb7] = "LPUBDEF32",
[0xb8] = "LCOMDEF",
[0xbc] = "CEXTDEF",
[0xc2] = "COMDAT16",
[0xc3] = "COMDAT32",
[0xc4] = "LINSYM16",
[0xc5] = "LINSYM32",
[0xc6] = "ALIAS",
[0xc8] = "NBKPAT16",
[0xc9] = "NBKPAT32",
[0xca] = "LLNAMES",
[0xcc] = "VERNUM",
[0xce] = "VENDEXT",
[0xf0] = "LIBHDR",
[0xf1] = "LIBEND",
};
typedef void (*dump_func)(uint8_t, const uint8_t *, size_t);
static void hexdump_data(unsigned int offset, const uint8_t *data, size_t n)
{
unsigned int i, j;
for (i = 0; i < n; i += 16) {
printf(" %04x: ", i+offset);
for (j = 0; j < 16; j++) {
if (i+j < n)
printf("%02x%c", data[i+j], (j == 7) ? '-' : ' ');
else
printf(" ");
}
printf(" : ");
for (j = 0; j < 16; j++) {
if (i+j < n)
putchar(isprint(data[i+j]) ? data[i+j] : '.');
}
putchar('\n');
}
}
static void dump_unknown(uint8_t type, const uint8_t *data, size_t n)
{
(void)type;
hexdump_data(0, data, n);
}
static void dump_coment(uint8_t type, const uint8_t *data, size_t n)
{
uint8_t class;
static const char *coment_class[256] = {
[0x00] = "Translator",
[0x01] = "Copyright",
[0x81] = "Library specifier",
[0x9c] = "MS-DOS version",
[0x9d] = "Memory model",
[0x9e] = "DOSSEG",
[0x9f] = "Library search",
[0xa0] = "OMF extensions",
[0xa1] = "New OMF extension",
[0xa2] = "Link pass separator",
[0xa3] = "LIBMOD",
[0xa4] = "EXESTR",
[0xa6] = "INCERR",
[0xa7] = "NOPAD",
[0xa8] = "WKEXT",
[0xa9] = "LZEXT",
[0xda] = "Comment",
[0xdb] = "Compiler",
[0xdc] = "Date",
[0xdd] = "Timestamp",
[0xdf] = "User",
[0xe9] = "Dependency file",
[0xff] = "Command line"
};
if (n < 2) {
dump_unknown(type, data, n);
return;
}
type = data[0];
class = data[1];
printf(" [NP=%d NL=%d UD=%02X] %02X %s\n",
(type >> 7) & 1,
(type >> 6) & 1,
type & 0x3f,
class,
coment_class[class] ? coment_class[class] : "???");
hexdump_data(2, data+2, n-2);
}
static const dump_func dump_type[256] =
{
[0x88] = dump_coment,
};
int dump_omf(int fd)
{
struct stat st;
size_t len, n;
uint8_t type;
const uint8_t *p, *data;
if (fstat(fd, &st))
return -1;
len = st.st_size;
data = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd, 0);
if (data == MAP_FAILED)
return -1;
p = data;
while (len >= 3) {
uint8_t csum;
int i;
type = p[0];
n = *(uint16_t *)(p+1);
printf("%02x %-10s %4zd bytes",
type,
record_types[type] ? record_types[type] : "???",
n);
if (len < n+3) {
printf("\n (truncated, only %zd bytes left)\n", len-3);
break; /* Truncated */
}
p += 3; /* Header doesn't count in the length */
n--; /* Remove checksum byte */
csum = 0;
for (i = -3; i < (int)n; i++)
csum -= p[i];
printf(", checksum %02X", p[i]);
if (csum == p[i])
printf(" (valid)\n");
else
printf(" (actual = %02X)\n", csum);
if (dump_type[type])
dump_type[type](type, p, n);
else
dump_unknown(type, p, n);
p += n+1;
len -= (n+4);
}
munmap((void *)data, st.st_size);
return 0;
}
int main(int argc, char *argv[])
{
int fd;
int i;
progname = argv[0];
for (i = 1; i < argc; i++) {
fd = open(argv[i], O_RDONLY);
if (fd < 0 || dump_omf(fd)) {
perror(argv[i]);
return 1;
}
close(fd);
}
return 0;
}
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