1 files changed, 226 insertions, 10 deletions

diff --git a/src/img3.c b/src/img3.c
index cf2e91c..ec7bcbf 100644
--- a/src/img3.c
+++ b/src/img3.c
@@ -26,7 +26,7 @@
 #include "img3.h"
 #include "idevicerestore.h"
 
-img3_file* img3_parse_file(unsigned char* data, int size) {
+img3_file* img3_parse_file(char* data, int size) {
 	int data_offset = 0;
 	img3_header* header = (img3_header*) data;
 	if(header->signature != kImg3Container) {
@@ -107,7 +107,6 @@ img3_file* img3_parse_file(unsigned char* data, int size) {
 		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);
@@ -116,7 +115,6 @@ img3_file* img3_parse_file(unsigned char* data, int size) {
 
 			} 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);
@@ -167,9 +165,26 @@ img3_file* img3_parse_file(unsigned char* data, int size) {
 	return image;
 }
 
-img3_element* img3_parse_element(char* element) {
-	img3_element_header* element_header = (img3_element_header*) element;
-	return 1;
+img3_element* img3_parse_element(char* data) {
+	img3_element_header* element_header = (img3_element_header*) data;
+	img3_element* element = (img3_element*) malloc(sizeof(img3_element));
+	if(element == NULL) {
+		error("ERROR: Unable to allocate memory for IMG3 element\n");
+		return NULL;
+	}
+	memset(element, '\0', sizeof(img3_element));
+
+	element->data = (char*) malloc(element_header->full_size);
+	if(element->data == NULL) {
+		error("ERROR: Unable to allocate memory for IMG3 element data\n");
+		free(element);
+		return NULL;
+	}
+	memcpy(element->data, data, element_header->full_size);
+	element->header = (img3_element_header*) element->data;
+	element->type = (img3_element_type) element->header->signature;
+
+	return element;
 }
 
 void img3_free(img3_file* image) {
@@ -178,14 +193,215 @@ void img3_free(img3_file* image) {
 			free(image->header);
 		}
 
+		if(image->type_element != NULL) {
+			img3_free_element(image->type_element);
+			image->type_element = NULL;
+		}
+
+		if(image->data_element != NULL) {
+			img3_free_element(image->data_element);
+			image->data_element = NULL;
+		}
+
+		if(image->vers_element != NULL) {
+			img3_free_element(image->vers_element);
+			image->vers_element = NULL;
+		}
+
+		if(image->sepo_element != NULL) {
+			img3_free_element(image->sepo_element);
+			image->sepo_element = NULL;
+		}
+
+		if(image->bord_element != NULL) {
+			img3_free_element(image->bord_element);
+			image->bord_element = NULL;
+		}
+
+		if(image->kbag1_element != NULL) {
+			img3_free_element(image->kbag1_element);
+			image->kbag1_element = NULL;
+		}
+
+		if(image->kbag2_element != NULL) {
+			img3_free_element(image->kbag2_element);
+			image->kbag2_element = NULL;
+		}
+
+		if(image->ecid_element != NULL) {
+			img3_free_element(image->ecid_element);
+			image->ecid_element = NULL;
+		}
+
+		if(image->shsh_element != NULL) {
+			img3_free_element(image->shsh_element);
+			image->shsh_element = NULL;
+		}
+
+		if(image->cert_element != NULL) {
+			img3_free_element(image->cert_element);
+			image->cert_element = NULL;
+		}
+
 		free(image);
+		image = NULL;
 	}
 }
 
-void img3_replace_signature(img3_file* image, char* signature) {
-	return;
+void img3_free_element(img3_element* element) {
+	if(element != NULL) {
+		if(element->data != NULL) {
+			free(element->data);
+			element->data = NULL;
+		}
+		free(element);
+		element = NULL;
+	}
 }
 
-char* img3_get_data(img3_file* image) {
-	return NULL;
+int img3_replace_signature(img3_file* image, char* signature) {
+	int offset = 0;
+	img3_element* ecid = img3_parse_element(&signature[offset]);
+	if(ecid == NULL || ecid->type != kEcidElement) {
+		error("ERROR: Unable to find ECID element in signature\n");
+		return -1;
+	}
+	offset += ecid->header->full_size;
+
+	img3_element* shsh = img3_parse_element(&signature[offset]);
+	if(shsh == NULL || shsh->type != kShshElement) {
+		error("ERROR: Unable to find SHSH element in signature\n");
+		return -1;
+	}
+	offset += shsh->header->full_size;
+
+	img3_element* cert = img3_parse_element(&signature[offset]);
+	if(cert == NULL || cert->type != kCertElement) {
+		error("ERROR: Unable to find CERT element in signature\n");
+		return -1;
+	}
+	offset += cert->header->full_size;
+
+	if(image->ecid_element != NULL) {
+		img3_free_element(image->ecid_element);
+	}
+	image->ecid_element = ecid;
+
+	if(image->shsh_element != NULL) {
+		img3_free_element(image->shsh_element);
+	}
+	image->shsh_element = shsh;
+
+	if(image->cert_element != NULL) {
+		img3_free_element(image->cert_element);
+	}
+	image->cert_element = cert;
+
+	return 0;
+}
+
+int img3_get_data(img3_file* image, char** pdata, int* psize) {
+	int offset = 0;
+	int size = sizeof(img3_header);
+
+	// Add up the size of the image first so we can allocate our memory
+	if(image->type_element != NULL) {
+		size += image->type_element->header->full_size;
+	}
+	if(image->data_element != NULL) {
+		size += image->data_element->header->full_size;
+	}
+	if(image->vers_element != NULL) {
+		size += image->vers_element->header->full_size;
+	}
+	if(image->sepo_element != NULL) {
+		size += image->sepo_element->header->full_size;
+	}
+	if(image->bord_element != NULL) {
+		size += image->bord_element->header->full_size;
+	}
+	if(image->kbag1_element != NULL) {
+		size += image->kbag1_element->header->full_size;
+	}
+	if(image->kbag2_element != NULL) {
+		size += image->kbag2_element->header->full_size;
+	}
+	if(image->ecid_element != NULL) {
+		size += image->ecid_element->header->full_size;
+	}
+	if(image->shsh_element != NULL) {
+		size += image->shsh_element->header->full_size;
+	}
+	if(image->cert_element != NULL) {
+		size += image->cert_element->header->full_size;
+	}
+
+	char* data = (char*) malloc(size);
+	if(data == NULL) {
+		error("ERROR: Unable to allocate memory for IMG3 data\n");
+		return -1;
+	}
+
+	// Add data to our new header (except shsh_offset)
+	img3_header* header = (img3_header*) data;
+	header->full_size = size;
+	header->signature = image->header->signature;
+	header->data_size = size - sizeof(img3_header);
+	header->image_type = image->header->image_type;
+	offset += sizeof(img3_header);
+
+	// Copy each section over to the new buffer
+	if(image->type_element != NULL) {
+		memcpy(&data[offset], image->type_element->data, image->type_element->header->full_size);
+		offset += image->type_element->header->full_size;
+	}
+	if(image->data_element != NULL) {
+		memcpy(&data[offset], image->data_element->data, image->data_element->header->full_size);
+		offset += image->data_element->header->full_size;
+	}
+	if(image->vers_element != NULL) {
+		memcpy(&data[offset], image->vers_element->data, image->vers_element->header->full_size);
+		offset += image->vers_element->header->full_size;
+	}
+	if(image->sepo_element != NULL) {
+		memcpy(&data[offset], image->sepo_element->data, image->sepo_element->header->full_size);
+		offset += image->sepo_element->header->full_size;
+	}
+	if(image->bord_element != NULL) {
+		memcpy(&data[offset], image->bord_element->data, image->bord_element->header->full_size);
+		offset += image->bord_element->header->full_size;
+	}
+	if(image->kbag1_element != NULL) {
+		memcpy(&data[offset], image->kbag1_element->data, image->kbag1_element->header->full_size);
+		offset += image->kbag1_element->header->full_size;
+	}
+	if(image->kbag2_element != NULL) {
+		memcpy(&data[offset], image->kbag2_element->data, image->kbag2_element->header->full_size);
+		offset += image->kbag2_element->header->full_size;
+	}
+	if(image->ecid_element != NULL) {
+		memcpy(&data[offset], image->ecid_element->data, image->ecid_element->header->full_size);
+		offset += image->ecid_element->header->full_size;
+	}
+	if(image->shsh_element != NULL) {
+		memcpy(&data[offset], image->shsh_element->data, image->shsh_element->header->full_size);
+		header->shsh_offset = offset - sizeof(img3_header);
+		offset += image->shsh_element->header->full_size;
+	}
+	if(image->cert_element != NULL) {
+		memcpy(&data[offset], image->cert_element->data, image->cert_element->header->full_size);
+		offset += image->cert_element->header->full_size;
+	}
+
+	if(offset != size) {
+		error("ERROR: Incorrectly sized image data\n");
+		free(data);
+		*pdata = 0;
+		*psize = 0;
+		return -1;
+	}
+
+	*pdata = data;
+	*psize = size;
+	return 0;
 }