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/*
* romtool
*
* Copyright (C) 2008 Jordan Crouse <jordan@cosmicpenguin.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
*/
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/mman.h>
#include "romtool.h"
void resize_usage(void)
{
printf("resize [SIZE] [ERASEBLOCK]\tResize the ROM\n");
}
int resize_handler(struct rom *rom, int argc, char **argv)
{
unsigned int size, align, offset;
char null = '\0';
int bootblocksize = ntohl(rom->header->bootblocksize);
if (argc < 1) {
resize_usage();
return -1;
}
if (rom->fd <= 0) {
ERROR("ROM file %s does not exist\n", rom->name);
return -1;
}
align = ntohl(rom->header->align);
size = get_size(argv[0]);
if (argc >= 2)
align = strtoul(argv[1], NULL, 0);
if (size == rom->size && align == ntohl(rom->header->align)) {
ERROR("New parameters are the same as the old\n");
return 0;
}
if (size < bootblocksize) {
ERROR("The new size is smaller then the bootblock size\n");
return -1;
}
/* if the current ROM is too big for the new size, then complain */
if (rom_used_space(rom) > size - bootblocksize) {
ERROR("The new size is too small for the current ROM\n");
return -1;
}
/* Grow the rom if we need to */
if (size > rom->size) {
munmap(rom->ptr, rom->size);
lseek(rom->fd, size - 1, SEEK_SET);
write(rom->fd, &null, 1);
rom->ptr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED,
rom->fd, 0);
if (rom->ptr == MAP_FAILED) {
ERROR("Unable to grow the ROM\n");
return -1;
}
}
/* We only have to rewrite the entries if the alignment changed */
if (align != ntohl(rom->header->align)) {
struct romfs_file *c;
/* The first entry doesn't have to move */
c = rom_find(rom, rom->header->offset);
offset = rom->header->offset;
while (c) {
struct romfs_file *n = rom_find_next(rom, c);
unsigned int next;
if (n == NULL)
break;
/* Calculate a new location for the entry */
next =
ROM_OFFSET(rom,
c) + ALIGN(ntohl(c->offset) +
ntohl(c->len), align);
/* Copy the next entry there */
memmove(ROM_PTR(rom, next), n,
ntohl(n->offset) + ntohl(n->len));
c = (struct romfs_file *)ROM_PTR(rom, next);
/* If the previous header wasn't overwritten by the change,
corrupt the header so we don't accidently find it */
if (ROM_OFFSET(rom, n) >
next + ntohl(c->len) + ntohl(c->offset))
memset(n->magic, 0, sizeof(n->magic));
}
}
/* Copy the bootblock */
memmove(rom->ptr + size - bootblocksize,
rom->ptr + rom->size - bootblocksize, bootblocksize);
/* Recacluate the location of the header */
offset = ROM_READL(rom, size - 12);
rom->header = (struct romfs_header *)
ROM_PTR(rom, size - (0xFFFFFFFF - offset) - 1);
/* Put the new values in the header */
rom->header->romsize = htonl(size);
rom->header->align = htonl(align);
/* Truncate the file if we have to */
if (size < rom->size) {
munmap(rom->ptr, rom->size);
rom->ptr = NULL;
if (ftruncate(rom->fd, size)) {
ERROR("Unable to truncate the ROM\n");
return -1;
}
rom->ptr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED,
rom->fd, 0);
if (rom->ptr == MAP_FAILED) {
ERROR("Unable to truncate the ROM\n");
return -1;
}
}
rom->size = size;
rom->fssize = size - bootblocksize;
return 0;
}
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