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/*
* mbn.c
* support for .mbn file format (found in .bbfw files)
*
* Copyright (c) 2012 Martin Szulecki. All Rights Reserved.
* 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 "mbn.h"
#include "common.h"
mbn_file* mbn_parse(unsigned char* data, unsigned int size)
{
mbn_file* mbn = (mbn_file*)malloc(sizeof(mbn_file));
if (!mbn) {
return NULL;
}
memset(mbn, '\0', sizeof(mbn_file));
mbn->data = malloc(size);
mbn->size = size;
memcpy(mbn->data, data, size);
/* FIXME: header parsing is not big endian safe */
if (memcmp(data, MBN_V2_MAGIC, MBN_V2_MAGIC_SIZE) == 0) {
mbn->version = 2;
memcpy(&mbn->header.v2, data, sizeof(mbn_header_v2));
mbn->parsed_size = mbn->header.v2.data_size + sizeof(mbn_header_v2);
} else if (memcmp(data, MBN_V1_MAGIC, MBN_V1_MAGIC_SIZE) == 0) {
mbn->version = 1;
memcpy(&mbn->header.v1, data, sizeof(mbn_header_v1));
mbn->parsed_size = mbn->header.v1.data_size + sizeof(mbn_header_v1);
} else if (memcmp(data, BIN_MAGIC, BIN_MAGIC_SIZE) == 0) {
mbn->version = 3;
memcpy(&mbn->header.bin, data, sizeof(bin_header));
mbn->parsed_size = mbn->header.bin.total_size;
} else if (memcmp(data, ELF_MAGIC, ELF_MAGIC_SIZE) == 0) {
mbn->version = 4;
memcpy(&mbn->header.elf, data, sizeof(elf_header));
// we cheat here since we don't parse the actual ELF file
mbn->parsed_size = mbn->size;
} else {
debug("DEBUG: Unknown file format passed to %s\n", __func__);
}
if (mbn->parsed_size != mbn->size) {
info("WARNING: size mismatch when parsing MBN file. Continuing anyway.\n");
}
return mbn;
}
void mbn_free(mbn_file* mbn)
{
if (mbn) {
if (mbn->data) {
free(mbn->data);
}
free(mbn);
}
}
int mbn_update_sig_blob(mbn_file* mbn, const unsigned char* sigdata, unsigned int siglen)
{
if (!mbn) {
error("ERROR: %s: no data\n", __func__);
return -1;
}
mbn->parsed_sig_offset = mbn->size - siglen;
if ((mbn->parsed_sig_offset + siglen) > mbn->size) {
error("ERROR: %s: signature is larger than mbn file size\n", __func__);
return -1;
}
memcpy(mbn->data + mbn->parsed_sig_offset, sigdata, siglen);
return 0;
}
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