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/*
* ftab.c
* Functions for handling the ftab format
*
* Copyright (c) 2019 Nikias Bassen. All Rights Reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "ftab.h"
#include "common.h"
#include "endianness.h"
int ftab_parse(unsigned char *data, unsigned int data_size, ftab_t *ftab, uint32_t *tag)
{
if (!data || !data_size || !ftab) {
return -1;
}
if (data_size < sizeof(struct ftab_header)) {
error("ERROR: %s: Buffer too small for ftab data\n", __func__);
return -1;
}
struct ftab_header *hdr_ptr = (struct ftab_header*)data;
if (be32toh(hdr_ptr->magic) != 'ftab') {
error("ERROR: %s: Unexpected magic value 0x%08x\n", le32toh(hdr_ptr->magic));
return -1;
}
/* copy header */
ftab_t ftab_new = (ftab_t)calloc(1, sizeof(struct ftab_fmt));
memcpy(&ftab_new->header, data, sizeof(struct ftab_header));
ftab_new->header.always_01 = le32toh(ftab_new->header.always_01);
ftab_new->header.always_ff = le32toh(ftab_new->header.always_ff);
ftab_new->header.tag = be32toh(ftab_new->header.tag);
if (tag) {
*tag = ftab_new->header.tag;
}
ftab_new->header.magic = be32toh(ftab_new->header.magic);
ftab_new->header.num_entries = le32toh(ftab_new->header.num_entries);
/* copy entries */
ftab_new->entries = (struct ftab_entry*)malloc(sizeof(struct ftab_entry) * ftab_new->header.num_entries);
memcpy(ftab_new->entries, data + sizeof(struct ftab_header), sizeof(struct ftab_entry) * ftab_new->header.num_entries);
/* create data storage */
ftab_new->storage = (unsigned char**)calloc(ftab_new->header.num_entries, sizeof(unsigned char*));
/* fill data storage */
uint32_t i = 0;
for (i = 0; i < ftab_new->header.num_entries; i++) {
ftab_new->entries[i].tag = be32toh(ftab_new->entries[i].tag);
ftab_new->entries[i].offset = le32toh(ftab_new->entries[i].offset);
ftab_new->entries[i].size = le32toh(ftab_new->entries[i].size);
ftab_new->storage[i] = malloc(ftab_new->entries[i].size);
memcpy(ftab_new->storage[i], data + ftab_new->entries[i].offset, ftab_new->entries[i].size);
}
*ftab = ftab_new;
return 0;
}
int ftab_get_entry_ptr(ftab_t ftab, uint32_t tag, unsigned char **data, unsigned int *data_size)
{
if (!ftab || !tag || !data || !data_size) {
return -1;
}
uint32_t i;
int res = -1;
for (i = 0; i < ftab->header.num_entries; i++) {
if (ftab->entries[i].tag == tag) {
*data = ftab->storage[i];
*data_size = ftab->entries[i].size;
res = 0;
}
}
return res;
}
int ftab_add_entry(ftab_t ftab, uint32_t tag, unsigned char *data, unsigned int data_size)
{
if (!ftab || !tag || !data || !data_size) {
return -1;
}
uint32_t new_index = ftab->header.num_entries;
struct ftab_entry *new_entries = realloc(ftab->entries, sizeof(struct ftab_entry) * (ftab->header.num_entries + 1));
if (!new_entries) {
error("ERROR: %s: realloc failed!\n", __func__);
return -1;
}
ftab->entries = new_entries;
unsigned char **new_storage = realloc(ftab->storage, sizeof(unsigned char*) * (ftab->header.num_entries + 1));
if (!new_storage) {
error("ERROR: %s: realloc failed!\n", __func__);
return -1;
}
ftab->storage = new_storage;
unsigned char *data_copy = (unsigned char*)malloc(data_size);
if (!data_copy) {
return -1;
}
memcpy(data_copy, data, data_size);
ftab->storage[new_index] = data_copy;
ftab->entries[new_index].tag = tag;
ftab->entries[new_index].size = data_size;
ftab->header.num_entries++;
uint32_t off = sizeof(struct ftab_header) + sizeof(struct ftab_entry) * ftab->header.num_entries;
uint32_t i;
for (i = 0; i < ftab->header.num_entries; i++) {
ftab->entries[i].offset = off;
off += ftab->entries[i].size;
}
return 0;
}
int ftab_write(ftab_t ftab, unsigned char **data, unsigned int *data_size)
{
uint32_t i;
unsigned int total_size = sizeof(struct ftab_header);
total_size += ftab->header.num_entries * sizeof(struct ftab_entry);
for (i = 0; i < ftab->header.num_entries; i++) {
total_size += ftab->entries[i].size;
}
unsigned char *data_out = (unsigned char*)malloc(total_size);
if (!data_out) {
error("ERROR: %s: Out of memory?!\n", __func__);
return -1;
}
struct ftab_header *ftab_header = (struct ftab_header*)data_out;
memset(ftab_header, '\0', sizeof(struct ftab_header));
ftab_header->always_01 = htole32(ftab->header.always_01);
ftab_header->always_ff = htole32(ftab->header.always_ff);
ftab_header->tag = htobe32(ftab->header.tag);
ftab_header->magic = htobe32(ftab->header.magic);
ftab_header->num_entries = htole32(ftab->header.num_entries);
for (i = 0; i < ftab->header.num_entries; i++) {
struct ftab_entry* entry = (struct ftab_entry*)(data_out + sizeof(struct ftab_header) + (sizeof(struct ftab_entry) * i));
entry->tag = htobe32(ftab->entries[i].tag);
entry->offset = htole32(ftab->entries[i].offset);
entry->size = htole32(ftab->entries[i].size);
entry->pad_0x0C = 0;
}
unsigned char *p = data_out + sizeof(struct ftab_header) + (sizeof(struct ftab_entry) * ftab->header.num_entries);
for (i = 0; i < ftab->header.num_entries; i++) {
memcpy(p, ftab->storage[i], ftab->entries[i].size);
p += ftab->entries[i].size;
}
*data = data_out;
*data_size = total_size;
return 0;
}
int ftab_free(ftab_t ftab)
{
if (!ftab) return -1;
uint32_t i = 0;
for (i = 0; i < ftab->header.num_entries; i++) {
free(ftab->storage[i]);
}
free(ftab->storage);
free(ftab->entries);
free(ftab);
return 0;
}
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