/****************************************************************************/
/*
* A simple program to manipulate flat files
*
* Copyright (C) 2001-2003 SnapGear Inc, davidm@snapgear.com
* Copyright (C) 2001 Lineo, davidm@lineo.com
*
* This is Free Software, under the GNU Public Licence v2 or greater.
*
*/
/****************************************************************************/
#include <stdio.h> /* Userland pieces of the ANSI C standard I/O package */
#include <unistd.h> /* Userland prototypes of the Unix std system calls */
#include <time.h>
#include <stdlib.h> /* exit() */
#include <string.h> /* strcat(), strcpy() */
/* macros for conversion between host and (internet) network byte order */
#ifndef WIN32
#include <netinet/in.h> /* Consts and structs defined by the internet system */
#define BINARY_FILE_OPTS
#else
#include <winsock2.h>
#define BINARY_FILE_OPTS "b"
#endif
/* from uClinux-x.x.x/include/linux */
#include "flat.h" /* Binary flat header description */
#if defined(__MINGW32__)
#include <getopt.h>
#define mkstemp(p) mktemp(p)
#endif
/****************************************************************************/
char *program_name;
static char cmd[1024];
static int print = 0, compress = 0, ramload = 0, stacksize = 0, ktrace = 0;
static int short_format = 0;
/****************************************************************************/
void
transferr(FILE *ifp, FILE *ofp, int count)
{
int n, num;
while (count == -1 || count > 0) {
if (count == -1 || count > sizeof(cmd))
num = sizeof(cmd);
else
num = count;
n = fread(cmd, 1, num, ifp);
if (n == 0)
break;
if (fwrite(cmd, n, 1, ofp) != 1) {
fprintf(stderr, "Write failed :-(\n");
exit(1);
}
if (count != -1)
count -= n;
}
if (count > 0) {
fprintf(stderr, "Failed to transferr %d bytes\n", count);
exit(1);
}
}
/****************************************************************************/
void
process_file(char *ifile, char *ofile)
{
int old_flags, old_stack, new_flags, new_stack;
FILE *ifp, *ofp;
int ofp_is_pipe = 0;
struct flat_hdr old_hdr, new_hdr;
char tfile[256];
char tfile2[256];
*tfile = *tfile2 = '\0';
if ((ifp = fopen(ifile, "r" BINARY_FILE_OPTS)) == NULL) {
fprintf(stderr, "Cannot open %s\n", ifile);
return;
}
if (fread(&old_hdr, sizeof(old_hdr), 1, ifp) != 1) {
fprintf(stderr, "Cannot read header of %s\n", ifile);
return;
}
if (strncmp(old_hdr.magic, "bFLT", 4) != 0) {
fprintf(stderr, "Cannot read header of %s\n", ifile);
return;
}
new_flags = old_flags = ntohl(old_hdr.flags);
new_stack = old_stack = ntohl(old_hdr.stack_size);
new_hdr = old_hdr;
if (compress == 1) {
new_flags |= FLAT_FLAG_GZIP;
new_flags &= ~FLAT_FLAG_GZDATA;
} else if (compress == 2) {
new_flags |= FLAT_FLAG_GZDATA;
new_flags &= ~FLAT_FLAG_GZIP;
} else if (compress < 0)
new_flags &= ~(FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA);
if (ramload > 0)
new_flags |= FLAT_FLAG_RAM;
else if (ramload < 0)
new_flags &= ~FLAT_FLAG_RAM;
if (ktrace > 0)
new_flags |= FLAT_FLAG_KTRACE;
else if (ktrace < 0)
new_flags &= ~FLAT_FLAG_KTRACE;
if (stacksize)
new_stack = stacksize;
if (print == 1) {
time_t t;
printf("%s\n", ifile);
printf(" Magic: %4.4s\n", old_hdr.magic);
printf(" Rev: %d\n", ntohl(old_hdr.rev));
t = (time_t) htonl(old_hdr.build_date);
printf(" Build Date: %s", t?ctime(&t):"not specified\n");
printf(" Entry: 0x%x\n", ntohl(old_hdr.entry));
printf(" Data Start: 0x%x\n", ntohl(old_hdr.data_start));
printf(" Data End: 0x%x\n", ntohl(old_hdr.data_end));
printf(" BSS End: 0x%x\n", ntohl(old_hdr.bss_end));
printf(" Stack Size: 0x%x\n", ntohl(old_hdr.stack_size));
printf(" Reloc Start: 0x%x\n", ntohl(old_hdr.reloc_start));
printf(" Reloc Count: 0x%x\n", ntohl(old_hdr.reloc_count));
printf(" Flags: 0x%x ( ", ntohl(old_hdr.flags));
if (old_flags) {
if (old_flags & FLAT_FLAG_RAM)
printf("Load-to-Ram ");
if (old_flags & FLAT_FLAG_GOTPIC)
printf("Has-PIC-GOT ");
if (old_flags & FLAT_FLAG_GZIP)
printf("Gzip-Compressed ");
if (old_flags & FLAT_FLAG_GZDATA)
printf("Gzip-Data-Compressed ");
if (old_flags & FLAT_FLAG_KTRACE)
printf("Kernel-Traced-Load ");
printf(")\n");
}
} else if (print > 1) {
static int first = 1;
unsigned int text, data, bss, stk, rel, tot;
if (first) {
printf("Flag Rev Text Data BSS Stack Relocs RAM Filename\n");
printf("-----------------------------------------------------------\n");
first = 0;
}
*tfile = '\0';
strcat(tfile, (old_flags & FLAT_FLAG_KTRACE) ? "k" : "");
strcat(tfile, (old_flags & FLAT_FLAG_RAM) ? "r" : "");
strcat(tfile, (old_flags & FLAT_FLAG_GOTPIC) ? "p" : "");
strcat(tfile, (old_flags & FLAT_FLAG_GZIP) ? "z" :
((old_flags & FLAT_FLAG_GZDATA) ? "d" : ""));
printf("-%-3.3s ", tfile);
printf("%3d ", ntohl(old_hdr.rev));
printf("%6d ", text=ntohl(old_hdr.data_start)-sizeof(struct flat_hdr));
printf("%6d ", data=ntohl(old_hdr.data_end)-ntohl(old_hdr.data_start));
printf("%6d ", bss=ntohl(old_hdr.bss_end)-ntohl(old_hdr.data_end));
printf("%6d ", stk=ntohl(old_hdr.stack_size));
printf("%6d ", rel=ntohl(old_hdr.reloc_count) * 4);
/*
* work out how much RAM is needed per invocation, this
* calculation is dependent on the binfmt_flat implementation
*/
tot = data; /* always need data */
if (old_flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP))
tot += text + sizeof(struct flat_hdr);
if (bss + stk > rel) /* which is bigger ? */
tot += bss + stk;
else
tot += rel;
printf("%6d ", tot);
/*
* the total depends on whether the relocs are smaller/bigger than
* the BSS
*/
printf("%s\n", ifile);
}
/* if there is nothing else to do, leave */
if (new_flags == old_flags && new_stack == old_stack)
return;
new_hdr.flags = htonl(new_flags);
new_hdr.stack_size = htonl(new_stack);
strcpy(tfile, "/tmp/flatXXXXXX");
mkstemp(tfile);
if ((ofp = fopen(tfile, "w" BINARY_FILE_OPTS)) == NULL) {
fprintf(stderr, "Failed to open %s for writing\n", tfile);
unlink(tfile);
unlink(tfile2);
exit(1);
}
if (fwrite(&new_hdr, sizeof(new_hdr), 1, ofp) != 1) {
fprintf(stderr, "Failed to write to %s\n", tfile);
unlink(tfile);
unlink(tfile2);
exit(1);
}
/*
* get ourselves a fully uncompressed copy of the text/data/relocs
* so that we can manipulate it more easily
*/
if (old_flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
FILE *tfp;
strcpy(tfile2, "/tmp/flat2XXXXXX");
mkstemp(tfile2);
if (old_flags & FLAT_FLAG_GZDATA) {
tfp = fopen(tfile2, "w" BINARY_FILE_OPTS);
if (!tfp) {
fprintf(stderr, "Failed to open %s for writing\n", tfile2);
exit(1);
}
transferr(ifp, tfp, ntohl(old_hdr.data_start) -
sizeof(struct flat_hdr));
fclose(tfp);
}
sprintf(cmd, "gunzip >> %s", tfile2);
tfp = popen(cmd, "w" BINARY_FILE_OPTS);
if(!tfp) {
perror("popen");
exit(1);
}
transferr(ifp, tfp, -1);
pclose(tfp);
fclose(ifp);
ifp = fopen(tfile2, "r" BINARY_FILE_OPTS);
if (!ifp) {
fprintf(stderr, "Failed to open %s for reading\n", tfile2);
unlink(tfile);
unlink(tfile2);
exit(1);
}
}
if (new_flags & FLAT_FLAG_GZIP) {
printf("zflat %s --> %s\n", ifile, ofile);
fclose(ofp);
sprintf(cmd, "gzip -9 -f >> %s", tfile);
ofp = popen(cmd, "w" BINARY_FILE_OPTS);
ofp_is_pipe = 1;
} else if (new_flags & FLAT_FLAG_GZDATA) {
printf("zflat-data %s --> %s\n", ifile, ofile);
transferr(ifp, ofp, ntohl(new_hdr.data_start) -
sizeof(struct flat_hdr));
fclose(ofp);
sprintf(cmd, "gzip -9 -f >> %s", tfile);
ofp = popen(cmd, "w" BINARY_FILE_OPTS);
ofp_is_pipe = 1;
}
if (!ofp) { /* can only happen if using gzip/gunzip */
fprintf(stderr, "Can't run cmd %s\n", cmd);
unlink(tfile);
unlink(tfile2);
exit(1);
}
transferr(ifp, ofp, -1);
if (ferror(ifp) || ferror(ofp)) {
fprintf(stderr, "Error on file pointer%s%s\n",
ferror(ifp) ? " input" : "", ferror(ofp) ? " output" : "");
unlink(tfile);
unlink(tfile2);
exit(1);
}
fclose(ifp);
if (ofp_is_pipe)
pclose(ofp);
else
fclose(ofp);
/* cheat a little here to preserve file permissions */
sprintf(cmd, "cp %s %s", tfile, ofile);
system(cmd);
unlink(tfile);
unlink(tfile2);
}
/****************************************************************************/
void
usage(char *s)
{
if (s)
fprintf(stderr, "%s\n", s);
fprintf(stderr, "usage: %s [options] flat-file\n", program_name);
fprintf(stderr, " Allows you to change an existing flat file\n\n");
fprintf(stderr, " -p : print current settings\n");
fprintf(stderr, " -z : compressed flat file\n");
fprintf(stderr, " -d : compressed data-only flat file\n");
fprintf(stderr, " -Z : un-compressed flat file\n");
fprintf(stderr, " -r : ram load\n");
fprintf(stderr, " -R : do not RAM load\n");
fprintf(stderr, " -k : kernel traced load (for debug)\n");
fprintf(stderr, " -K : normal non-kernel traced load\n");
fprintf(stderr, " -s size : stack size\n");
fprintf(stderr, " -o file : output-file\n"
" (default is to modify input file)\n");
exit(1);
}
/****************************************************************************/
int
main(int argc, char *argv[])
{
int c;
char *ofile = NULL, *ifile;
program_name = argv[0];
while ((c = getopt(argc, argv, "pdzZrRkKs:o:")) != EOF) {
switch (c) {
case 'p': print = 1; break;
case 'z': compress = 1; break;
case 'd': compress = 2; break;
case 'Z': compress = -1; break;
case 'r': ramload = 1; break;
case 'R': ramload = -1; break;
case 'k': ktrace = 1; break;
case 'K': ktrace = -1; break;
case 's': stacksize = atoi(optarg); break;
case 'o': ofile = optarg; break;
default:
usage("invalid option");
break;
}
}
if (optind >= argc)
usage("No input files provided");
if (ofile && argc - optind > 1)
usage("-o can only be used with a single file");
if (!print && !compress && !ramload && !stacksize) /* no args == print */
print = argc - optind; /* greater than 1 is short format */
for (c = optind; c < argc; c++) {
ifile = argv[c];
if (!ofile)
ofile = ifile;
process_file(ifile, ofile);
ofile = NULL;
}
exit(0);
}
/****************************************************************************/
