/*
?*?unyaffs:?extract?files?from?yaffs2?file?system?image?to?current?directory
?*
?*?Created?by?Kai?Wei?
?*?This?program?is?free?software;?you?can?redistribute?it?and/or?modify
?*?it?under?the?terms?of?the?GNU?General?Public?License?version?2?as
?*?published?by?the?Free?Software?Foundation.
?*/

#include?
#include?
#include?
#include?
#include?
#include?
#include?

#include?“unyaffs.h“

#define?CHUNK_SIZE?2048
#define?SPARE_SIZE?64
#define?MAX_objectS?10000
#define?YAFFS_objectID_ROOT?????1


unsigned?char?data[CHUNK_SIZE?+?SPARE_SIZE];
unsigned?char?*chunk_data?=?data;
unsigned?char?*spare_data?=?data?+?CHUNK_SIZE;
int?img_file;

char?*obj_list[MAX_objectS];
int?process_chunk（）
{
	int?out_file?remain?s;
	char?*full_path_name;

	yaffs_PackedTags2?*pt?=?（yaffs_PackedTags2?*）spare_data;
	if?（pt->t.byteCount?==?0xffff）??{	//a?new?object?

		yaffs_objectHeader?*oh?=?（yaffs_objectHeader?*）malloc（sizeof（yaffs_objectHeader））;
		memcpy（oh?chunk_data?sizeof（yaffs_objectHeader））;

		full_path_name?=?（char?*）malloc（strlen（oh->name）?+?strlen（obj_list[oh->parentobjectId]）?+?2）;
		if?（full_path_name?==?NULL）?{
			perror（“malloc?full?path?name\n“）;
		}
		strcpy（full_path_name?obj_list[oh->parentobjectId]）;
		strcat（full_path_name?“/“）;
		strcat（full_path_name?oh->name）;
		obj_list[pt->t.objectId]?=?full_path_name;

		switch（oh->type）?{
			case?YAFFS_object_TYPE_FILE:
				remain?=?oh->fileSize;
				out_file?=?creat（full_path_name?oh->yst_mode）;
				while（remain?>?0）?{
					if?（read_chunk（））
						return?-1;
					s?=?（remain?t.byteCount）???remain?:?pt->t.byteCount;	
					if?（write（out_file?chunk_data?s）?==?-1）
						return?-1;
					remain?-=?s;
				}
				close（out_file）;
				break;
			case?YAFFS_object_TYPE_SYMlink:
				symlink（oh->alias?full_path_name）;
				break;
			case?YAFFS_object_TYPE_DIRECTORY:
				mkdir（full_path_name?0777）;
				break;
			case?YAFFS_object_TYPE_HARDlink:
				link（obj_list[oh->equivalentobjectId]?full_path_name）;
				break;
		}
	}
}


int?read_chunk（）
{
	ssize_t?s;
	int?ret?=?-1;
	memset（chunk_data?0xff?sizeof（chunk_data））;
	s?=?read（img_file?data?CHUNK_SIZE?+?SPARE_SIZE）;
	if?（s?==?-1）?{
		perror（“read?image?file\n“）;
	}?else?if?（s?==?0）?{
		printf（“end?of?image\n“）;
	}?else?if?（（s?==?（CHUNK_SIZE?+?SPARE_SIZE）））?{
		ret?=?0;
	}?else?{
		fprintf（stderr?“broken?image?file\n“）;
	}
	return?ret;
}

int?main（int?argc?char?**argv）
{
	if?（argc?!=?2）?{
		printf（“Usage:?unyaffs?image_file_name\n“）;
		exit（1）;
	}
	img_file?=?open（argv[1]?O_RDONLY）;
	if?（img_file?==?-1）?{
		printf（“open?image?file?failed\n“）;
		exit（1）;
	}

	obj_list[YAFFS_objectID_ROOT]?=?“.“;
	while（1）?{
		if?（read_chunk（）?==?-1）
			break;
		process_chunk（）;
	}
	close（img_file）;
	return?0;
}

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----
?????文件????????2827??2013-03-10?11:32??unyaffs.c
?????文件????????3729??2013-03-10?11:32??unyaffs.h
?????文件???????10179??2013-03-10?11:32??unyaffs?（1）