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/*
* fls.c
* support for .fls file format (found in .bbfw files)
*
* Copyright (c) 2012 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 "fls.h"
#include "common.h"
#ifndef offsetof
#define offsetof(type, member) __builtin_offsetof (type, member)
#endif
static void fls_parse_elements(fls_file* fls)
{
/* FIXME: the following code is not big endian safe */
if (!fls || !fls->data) {
return;
}
uint32_t offset = 0;
fls->max_elements = 32;
fls->elements = (fls_element**)malloc(sizeof(fls_element*) * fls->max_elements);
fls_element* cur = NULL;
do {
void* p = fls->data + offset;
uint32_t hdrsize = 0;
cur = (fls_element*)p;
if ((offset + cur->size) > fls->size) {
break;
}
fls_element* ne;
switch (cur->type) {
case 0x0c:
{
hdrsize = offsetof(fls_0c_element, data);
fls_0c_element* xe = (fls_0c_element*)malloc(sizeof(fls_0c_element));
memset(xe, '\0', sizeof(fls_0c_element));
memcpy((void*)xe, p, hdrsize);
xe->data = (xe->size > hdrsize) ? xe->data = p + hdrsize : NULL;
ne = (fls_element*)xe;
fls->c_element = xe;
}
break;
case 0x10:
{
hdrsize = offsetof(fls_10_element, data);
fls_10_element* xe = (fls_10_element*)malloc(sizeof(fls_10_element));
memset(xe, '\0', sizeof(fls_10_element));
memcpy((void*)xe, p, hdrsize);
xe->data = (xe->size > hdrsize) ? xe->data = p + hdrsize : NULL;
ne = (fls_element*)xe;
}
break;
case 0x14:
{
hdrsize = offsetof(fls_14_element, data);
fls_14_element* xe = (fls_14_element*)malloc(sizeof(fls_14_element));
memset(xe, '\0', sizeof(fls_14_element));
memcpy((void*)xe, p, hdrsize);
xe->data = (xe->size > hdrsize) ? xe->data = p + hdrsize : NULL;
ne = (fls_element*)xe;
}
break;
default:
hdrsize = offsetof(fls_element, data);
ne = (fls_element*)malloc(sizeof(fls_element));
memset(ne, '\0', sizeof(fls_element));
ne->type = cur->type;
ne->size = cur->size;
ne->data = (ne->size > hdrsize) ? ne->data = p + hdrsize : NULL;
break;
}
if ((fls->num_elements + 1) > fls->max_elements) {
fls->max_elements += 10;
fls->elements = (fls_element**)realloc(fls->elements, sizeof(fls_element*) * fls->max_elements);
}
fls->elements[fls->num_elements++] = ne;
offset += cur->size;
} while (offset < fls->size);
if (offset != fls->size) {
error("ERROR: %s: error parsing elements\n", __func__);
return;
}
}
fls_file* fls_parse(unsigned char* data, unsigned int size)
{
fls_file* fls = (fls_file*)malloc(sizeof(fls_file));
if (!fls) {
return NULL;
}
memset(fls, '\0', sizeof(fls_file));
fls->data = malloc(size);
fls->size = size;
memcpy(fls->data, data, size);
fls_parse_elements(fls);
return fls;
}
void fls_free(fls_file* fls)
{
if (fls) {
if (fls->num_elements > 0) {
int i;
for (i = fls->num_elements-1; i >=0; i--) {
free(fls->elements[i]);
}
free(fls->elements);
}
if (fls->data) {
free(fls->data);
}
free(fls);
}
}
int fls_update_sig_blob(fls_file* fls, const unsigned char* sigdata, unsigned int siglen)
{
/* FIXME: the code in this function is not big endian safe */
if (!fls || !fls->num_elements) {
error("ERROR: %s: no data\n", __func__);
return -1;
}
if (!fls->c_element) {
error("ERROR: %s: no fls_0c_element in fls data\n", __func__);
return -1;
}
uint32_t datasize = *(uint32_t*)(fls->c_element->data + 0x10);
if (datasize != fls->c_element->data_size) {
error("ERROR: %s: data size mismatch (0x%x != 0x%x)\n", __func__, datasize, fls->c_element->data_size);
return -1;
}
uint32_t sigoffset = *(uint32_t*)(fls->c_element->data + 0x14);
if (sigoffset > datasize) {
error("ERROR: %s: signature offset greater than data size (0x%x > 0x%x)\n", __func__, sigoffset, datasize);
return -1;
}
uint32_t oldsiglen = datasize - sigoffset;
uint32_t newsize = fls->size - oldsiglen + siglen;
unsigned int i;
uint32_t offset = 0;
void* newdata = malloc(newsize);
if (!newdata) {
error("ERROR: %s: out of memory\n", __func__);
return -1;
}
uint32_t hdrsize = 0;
uint32_t firstpartlen = 0;
for (i = 0; i < fls->num_elements; i++) {
switch (fls->elements[i]->type) {
case 0x0c:
hdrsize = offsetof(fls_0c_element, data);
// update offset
((fls_0c_element*)fls->elements[i])->offset = offset+hdrsize;
// copy first part of data
firstpartlen = fls->elements[i]->size - hdrsize - oldsiglen;
memcpy(newdata+offset+hdrsize, ((fls_0c_element*)fls->elements[i])->data, firstpartlen);
// copy new signature data
memcpy(newdata+offset+hdrsize+firstpartlen, sigdata, siglen);
((fls_0c_element*)fls->elements[i])->data = newdata+offset+hdrsize;
fls->elements[i]->size -= oldsiglen;
fls->elements[i]->size += siglen;
((fls_0c_element*)fls->elements[i])->data_size -= oldsiglen;
((fls_0c_element*)fls->elements[i])->data_size += siglen;
memcpy(newdata+offset+hdrsize+0x10, &(((fls_0c_element*)fls->elements[i])->data_size), 4);
// copy header
memcpy(newdata+offset, fls->elements[i], hdrsize);
break;
case 0x10:
hdrsize = offsetof(fls_10_element, data);
// update offset
((fls_10_element*)fls->elements[i])->offset = offset+hdrsize;
// copy header
memcpy(newdata+offset, fls->elements[i], hdrsize);
// copy data
if (fls->elements[i]->size > hdrsize) {
memcpy(newdata+offset+hdrsize, ((fls_10_element*)fls->elements[i])->data, fls->elements[i]->size - hdrsize);
((fls_10_element*)fls->elements[i])->data = newdata+offset+hdrsize;
} else {
((fls_10_element*)fls->elements[i])->data = NULL;
}
break;
case 0x14:
hdrsize = offsetof(fls_14_element, data);
// update offset
((fls_14_element*)fls->elements[i])->offset = offset+hdrsize;
// copy header
memcpy(newdata+offset, fls->elements[i], hdrsize);
// copy data
if (fls->elements[i]->size > hdrsize) {
memcpy(newdata+offset+hdrsize, ((fls_14_element*)fls->elements[i])->data, fls->elements[i]->size - hdrsize);
((fls_14_element*)fls->elements[i])->data = newdata+offset+hdrsize;
} else {
((fls_14_element*)fls->elements[i])->data = NULL;
}
break;
default:
hdrsize = offsetof(fls_element, data);
// copy header
memcpy(newdata+offset, fls->elements[i], hdrsize);
// copy data
if (fls->elements[i]->size > hdrsize) {
memcpy(newdata+offset+hdrsize, fls->elements[i]->data, fls->elements[i]->size - hdrsize);
fls->elements[i]->data = newdata+offset+hdrsize;
} else {
fls->elements[i]->data = NULL;
}
break;
}
offset += fls->elements[i]->size;
}
if (fls->data) {
free(fls->data);
}
fls->data = newdata;
fls->size = newsize;
return 0;
}
int fls_insert_ticket(fls_file* fls, const unsigned char* data, unsigned int size)
{
/* FIXME: the code in this function is not big endian safe */
if (!fls || !fls->num_elements) {
error("ERROR: %s: no data\n", __func__);
return -1;
}
if (!fls->c_element) {
error("ERROR: %s: no fls_0c_element in fls data\n", __func__);
return -1;
}
uint32_t padding = 0;
if (size%4 != 0) {
padding = 4-(size%4);
}
uint32_t newsize = fls->size + size + padding;
unsigned int i;
uint32_t offset = 0;
void* newdata = malloc(newsize);
if (!newdata) {
error("ERROR: %s: out of memory\n", __func__);
return -1;
}
uint32_t hdrsize = 0;
for (i = 0; i < fls->num_elements; i++) {
switch (fls->elements[i]->type) {
case 0x0c:
hdrsize = offsetof(fls_0c_element, data);
// update offset
((fls_0c_element*)fls->elements[i])->offset = offset+hdrsize;
// copy ticket data
memcpy(newdata+offset+hdrsize, data, size);
if (padding > 0) {
// padding
memset(newdata+offset+hdrsize+size, '\xFF', padding);
}
// copy remaining data
memcpy(newdata+offset+hdrsize+size+padding, ((fls_0c_element*)fls->elements[i])->data, fls->elements[i]->size);
((fls_0c_element*)fls->elements[i])->data = newdata+offset+hdrsize;
fls->elements[i]->size += (size + padding);
((fls_0c_element*)fls->elements[i])->data_size += (size + padding);
// copy header
memcpy(newdata+offset, fls->elements[i], hdrsize);
break;
case 0x10:
hdrsize = offsetof(fls_10_element, data);
// update offset
((fls_10_element*)fls->elements[i])->offset = offset+hdrsize;
// copy header
memcpy(newdata+offset, fls->elements[i], hdrsize);
// copy data
if (fls->elements[i]->size > hdrsize) {
memcpy(newdata+offset+hdrsize, ((fls_10_element*)fls->elements[i])->data, fls->elements[i]->size - hdrsize);
((fls_10_element*)fls->elements[i])->data = newdata+offset+hdrsize;
} else {
((fls_10_element*)fls->elements[i])->data = NULL;
}
break;
case 0x14:
hdrsize = offsetof(fls_14_element, data);
// update offset
((fls_14_element*)fls->elements[i])->offset = offset+hdrsize;
// copy header
memcpy(newdata+offset, fls->elements[i], hdrsize);
// copy data
if (fls->elements[i]->size > hdrsize) {
memcpy(newdata+offset+hdrsize, ((fls_14_element*)fls->elements[i])->data, fls->elements[i]->size - hdrsize);
((fls_14_element*)fls->elements[i])->data = newdata+offset+hdrsize;
} else {
((fls_14_element*)fls->elements[i])->data = NULL;
}
break;
default:
hdrsize = offsetof(fls_element, data);
// copy header
memcpy(newdata+offset, fls->elements[i], hdrsize);
// copy data
if (fls->elements[i]->size > hdrsize) {
memcpy(newdata+offset+hdrsize, fls->elements[i]->data, fls->elements[i]->size - hdrsize);
fls->elements[i]->data = newdata+offset+hdrsize;
} else {
fls->elements[i]->data = NULL;
}
break;
}
offset += fls->elements[i]->size;
}
if (fls->data) {
free(fls->data);
}
fls->data = newdata;
fls->size = newsize;
return 0;
}
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