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/*
* img3.c
* Functions for handling with Apple's IMG3 format
*
* Copyright (c) 2010 Joshua Hill. 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 "img3.h"
#include "idevicerestore.h"
img3_file* img3_parse_file(unsigned char* data, int size) {
int data_offset = 0;
img3_header* header = (img3_header*) data;
if(header->signature != kImg3Container) {
error("ERROR: Invalid IMG3 file\n");
return NULL;
}
img3_file* image = (img3_file*) malloc(sizeof(img3_file));
if(image == NULL) {
error("ERROR: Unable to allocate memory for IMG3 file\n");
return NULL;
}
memset(image, '\0', sizeof(img3_file));
image->header = (img3_header*) malloc(sizeof(img3_header));
if(image->header == NULL) {
error("ERROR: Unable to allocate memory for IMG3 header\n");
img3_free(image);
return NULL;
}
memcpy(image->header, data, sizeof(img3_header));
data_offset += sizeof(img3_header);
img3_element_header* current = NULL;
while(data_offset < size) {
current = (img3_element_header*) &data[data_offset];
switch(current->signature) {
case kTypeElement:
image->type_element = img3_parse_element(&data[data_offset]);
if(image->type_element == NULL) {
error("ERROR: Unable to parse TYPE element\n");
img3_free(image);
return NULL;
}
debug("Parsed TYPE element\n");
break;
case kDataElement:
image->data_element = img3_parse_element(&data[data_offset]);
if(image->data_element == NULL) {
error("ERROR: Unable to parse DATA element\n");
img3_free(image);
return NULL;
}
debug("Parsed DATA element\n");
break;
case kVersElement:
image->vers_element = img3_parse_element(&data[data_offset]);
if(image->vers_element == NULL) {
error("ERROR: Unable to parse VERS element\n");
img3_free(image);
return NULL;
}
debug("Parsed VERS element\n");
break;
case kSepoElement:
image->sepo_element = img3_parse_element(&data[data_offset]);
if(image->sepo_element == NULL) {
error("ERROR: Unable to parse SEPO element\n");
img3_free(image);
return NULL;
}
debug("Parsed SEPO element\n");
break;
case kBordElement:
image->bord_element = img3_parse_element(&data[data_offset]);
if(image->bord_element == NULL) {
error("ERROR: Unable to parse BORD element\n");
img3_free(image);
return NULL;
}
debug("Parsed BORD element\n");
break;
case kKbagElement:
if(image->kbag1_element == NULL) {
image->kbag1_element = img3_parse_element(&data[data_offset]);
image->kbag1_element = img3_parse_element(&data[data_offset]);
if(image->kbag1_element == NULL) {
error("ERROR: Unable to parse first KBAG element\n");
img3_free(image);
return NULL;
}
} else {
image->kbag2_element = img3_parse_element(&data[data_offset]);
image->kbag2_element = img3_parse_element(&data[data_offset]);
if(image->kbag2_element == NULL) {
error("ERROR: Unable to parse second KBAG element\n");
img3_free(image);
return NULL;
}
}
debug("Parsed KBAG element\n");
break;
case kEcidElement:
image->ecid_element = img3_parse_element(&data[data_offset]);
if(image->ecid_element == NULL) {
error("ERROR: Unable to parse ECID element\n");
img3_free(image);
return NULL;
}
debug("Parsed ECID element\n");
break;
case kShshElement:
image->shsh_element = img3_parse_element(&data[data_offset]);
if(image->shsh_element == NULL) {
error("ERROR: Unable to parse SHSH element\n");
img3_free(image);
return NULL;
}
debug("Parsed SHSH element\n");
break;
case kCertElement:
image->cert_element = img3_parse_element(&data[data_offset]);
if(image->cert_element == NULL) {
error("ERROR: Unable to parse CERT element\n");
img3_free(image);
return NULL;
}
debug("Parsed CERT element\n");
break;
default:
error("ERROR: Unknown IMG3 element type\n");
img3_free(image);
return NULL;
}
data_offset += current->full_size;
}
return image;
}
img3_element* img3_parse_element(char* element) {
img3_element_header* element_header = (img3_element_header*) element;
return 1;
}
void img3_free(img3_file* image) {
if(image != NULL) {
if(image->header != NULL) {
free(image->header);
}
free(image);
}
}
void img3_replace_signature(img3_file* image, char* signature) {
return;
}
char* img3_get_data(img3_file* image) {
return NULL;
}
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