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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 <string.h>
#include "romtool.h"
struct romfs_file *rom_find(struct rom *rom, unsigned int offset)
{
while (offset < rom->fssize) {
struct romfs_file *c =
(struct romfs_file *)ROM_PTR(rom, offset);
if (!strcmp(c->magic, COMPONENT_MAGIC))
return c;
offset += ntohl(rom->header->align);
}
return NULL;
}
struct romfs_file *rom_find_first(struct rom *rom)
{
return rom_find(rom, ntohl(rom->header->offset));
}
struct romfs_file *rom_find_next(struct rom *rom, struct romfs_file *prev)
{
unsigned int offset = ROM_OFFSET(rom, prev);
return rom_find(rom, offset +
ALIGN(ntohl(prev->offset) + ntohl(prev->len),
ntohl(rom->header->align)));
}
struct romfs_file *rom_find_empty(struct rom *rom)
{
unsigned int offset = ntohl(rom->header->offset);
unsigned int ret = ntohl(rom->header->offset);
while (offset < rom->fssize) {
struct romfs_file *c =
(struct romfs_file *)ROM_PTR(rom, offset);
if (!strcmp(c->magic, COMPONENT_MAGIC)) {
offset += ALIGN(ntohl(c->offset) + ntohl(c->len),
ntohl(rom->header->align));
ret = offset;
} else
offset += ntohl(rom->header->align);
}
return (ret < rom->fssize) ?
(struct romfs_file *)ROM_PTR(rom, ret) : NULL;
}
struct romfs_file *rom_find_by_name(struct rom *rom, const char *name)
{
struct romfs_file *c = rom_find_first(rom);
while (c) {
if (!strcmp((char *)ROMFS_NAME(c), name))
return c;
c = rom_find_next(rom, c);
}
return NULL;
}
unsigned int rom_used_space(struct rom *rom)
{
struct romfs_file *c = rom_find_first(rom);
unsigned int ret = 0;
while (c) {
ret = ROM_OFFSET(rom, c) + ntohl(c->offset) + ntohl(c->len);
c = rom_find_next(rom, c);
}
return ret;
}
int rom_remove(struct rom *rom, const char *name)
{
struct romfs_file *c = rom_find_by_name(rom, name);
struct romfs_file *n;
int clear;
if (c == NULL) {
ERROR("Component %s does not exist\n", name);
return -1;
}
/* Get the next component - and copy it into the current
space */
n = rom_find_next(rom, c);
memcpy(c, n, rom->fssize - ROM_OFFSET(rom, n));
clear = ROM_OFFSET(rom, n) - ROM_OFFSET(rom, c);
/* Zero the new space */
memset(ROM_PTR(rom, rom->fssize - clear), 0, clear);
return 0;
}
int rom_add(struct rom *rom, const char *name, void *buffer, int size, int type)
{
struct romfs_file *c = rom_find_empty(rom);
unsigned int offset;
unsigned int csize;
if (rom_find_by_name(rom, name)) {
ERROR("Component %s already exists in this rom\n", name);
return -1;
}
if (c == NULL) {
ERROR("There is no more room in this ROM\n");
return -1;
}
csize = sizeof(struct romfs_file) + ALIGN(strlen(name), 16) + size;
offset = ROM_OFFSET(rom, c);
if (offset + csize >= rom->fssize) {
ERROR("There is not enough room in this ROM for this\n");
ERROR("component. I need %d bytes, only have %d bytes avail\n",
csize, rom->fssize - offset);
return -1;
}
strcpy(c->magic, COMPONENT_MAGIC);
csize = sizeof(struct romfs_file) + ALIGN(strlen(name) + 1, 16);
c->len = htonl(size);
c->offset = htonl(csize);
c->type = htonl(type);
memset(ROMFS_NAME(c), 0, ALIGN(strlen(name) + 1, 16));
strcpy((char *)ROMFS_NAME(c), name);
memcpy(((unsigned char *)c) + csize, buffer, size);
return 0;
}
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