Add ELF support

jni/bootimgtools/Android.mk

@@ -3,6 +3,6 @@ LOCAL_PATH := $(call my-dir)
 include $(CLEAR_VARS)
 LOCAL_MODULE := bootimgtools
 LOCAL_MODULE_TAGS := optional
-LOCAL_SRC_FILES := main.c unpack.c repack.c hexpatch.c
+LOCAL_SRC_FILES := main.c unpack.c repack.c hexpatch.c parseimg.c
 LOCAL_CFLAGS += -std=gnu11
 include $(BUILD_EXECUTABLE)

jni/bootimgtools/bootimg.h

@@ -93,8 +93,20 @@ struct boot_img_hdr
 **    else: jump to kernel_addr
 */
 
+
+/* Self defined stuffs */
+
+// Global pointers to mmap
+unsigned char *base, *kernel, *ramdisk, *second, *dtb;
+// Parsed header
+boot_img_hdr hdr;
+
 int unpack(const char *image);
 int repack(const char *image);
 int hexpatch(char *image, char *from, char *to);
+void error(int rc, const char *msg, ...);
+void print_header();
+void parse_elf();
+void parse_aosp();
 
 #endif

jni/bootimgtools/elf.h

@@ -0,0 +1,149 @@
+
+#ifndef _ELF_H_
+#define _ELF_H_
+
+#include <stdint.h>
+
+/*
+** ELF structure
+**
+** +-----------------+ 
+** | ELF magic |     | 4 bytes
+** +------------     +
+** | ELF class |     | 1 byte  
+** +------------     +
+** |   ELF header    |
+** +-----------------+
+**          ~
+** +-----------------+
+** | program header  | kernel info
+** +-----------------+
+** | program header  | ramdisk info
+** +-----------------+
+** | program header  | dtb info
+** +-----------------+
+**          ~
+** +-----------------+
+** | section header  | cmdline info
+** +-----------------+
+**          ~
+** +-----------------+
+** |                 |
+** |      Data       |  
+** |                 |
+** +-----------------+
+
+*/
+
+typedef uint32_t	elf32_addr;
+typedef uint16_t	elf32_half;
+typedef uint32_t	elf32_off;
+typedef uint32_t	elf32_word;
+
+typedef uint64_t	elf64_addr;
+typedef uint16_t	elf64_half;
+typedef uint64_t	elf64_off;
+typedef uint32_t	elf64_word;
+typedef uint64_t	elf64_xword;
+
+#define ELF_MAGIC 		"\x7f""ELF"
+#define ELF_MAGIC_SIZE	4
+
+#define EI_CLASS		4
+#define EI_DATA			5
+#define EI_VERSION		6
+#define EI_OSABI		7
+#define EI_PAD			8
+
+#define ELFCLASSNONE	0
+#define ELFCLASS32		1
+#define ELFCLASS64		2
+#define ELFCLASSNUM		3
+
+#define ET_EXEC			2
+#define EM_ARM			40
+#define EI_NIDENT		16
+
+typedef struct elf32_ehdr{
+	unsigned char	e_ident[EI_NIDENT];
+	elf32_half		e_type;
+	elf32_half		e_machine;
+	elf32_word		e_version;
+	elf32_addr		e_entry;	/* Entry point */
+	elf32_off		e_phoff;
+	elf32_off		e_shoff;
+	elf32_word		e_flags;
+	elf32_half		e_ehsize;
+	elf32_half		e_phentsize;
+	elf32_half		e_phnum;
+	elf32_half		e_shentsize;
+	elf32_half		e_shnum;
+	elf32_half		e_shstrndx;
+} elf32_ehdr;
+
+typedef struct elf64_ehdr {
+	unsigned char	e_ident[EI_NIDENT];	/* ELF "magic number" */
+	elf64_half		e_type;
+	elf64_half		e_machine;
+	elf64_word		e_version;
+	elf64_addr		e_entry;	/* Entry point virtual address */
+	elf64_off		e_phoff;	/* Program header table file offset */
+	elf64_off		e_shoff;	/* Section header table file offset */
+	elf64_word		e_flags;
+	elf64_half		e_ehsize;
+	elf64_half		e_phentsize;
+	elf64_half		e_phnum;
+	elf64_half		e_shentsize;
+	elf64_half		e_shnum;
+	elf64_half		e_shstrndx;
+} elf64_ehdr;
+
+typedef struct elf32_phdr{
+	elf32_word		p_type;
+	elf32_off		p_offset;
+	elf32_addr		p_vaddr;
+	elf32_addr		p_paddr;
+	elf32_word		p_filesz;
+	elf32_word		p_memsz;
+	elf32_word		p_flags;
+	elf32_word		p_align;
+} elf32_phdr;
+
+typedef struct elf64_phdr {
+	elf64_word		p_type;
+	elf64_word		p_flags;
+	elf64_off		p_offset;		/* Segment file offset */
+	elf64_addr		p_vaddr;		/* Segment virtual address */
+	elf64_addr		p_paddr;		/* Segment physical address */
+	elf64_xword		p_filesz;		/* Segment size in file */
+	elf64_xword		p_memsz;		/* Segment size in memory */
+	elf64_xword		p_align;		/* Segment alignment, file & memory */
+} elf64_phdr;
+
+typedef struct elf32_shdr {
+	elf32_word		s_name;
+	elf32_word		s_type;
+	elf32_word		s_flags;
+	elf32_addr		s_addr;
+	elf32_off		s_offset;
+	elf32_word		s_size;
+	elf32_word		s_link;
+	elf32_word		s_info;
+	elf32_word		s_addralign;
+	elf32_word		s_entsize;
+} elf32_shdr;
+
+typedef struct elf64_shdr {
+	elf64_word		s_name;			/* Section name, index in string tbl */
+	elf64_word		s_type;			/* Type of section */
+	elf64_xword		s_flags;		/* Miscellaneous section attributes */
+	elf64_addr		s_addr;			/* Section virtual addr at execution */
+	elf64_off		s_offset;		/* Section file offset */
+	elf64_xword		s_size;			/* Size of section in bytes */
+	elf64_word		s_link;			/* Index of another section */
+	elf64_word		s_info;			/* Additional section information */
+	elf64_xword		s_addralign;	/* Section alignment */
+	elf64_xword		s_entsize;		/* Entry size if section holds table */
+} elf64_shdr;
+
+#endif

jni/bootimgtools/main.c

@@ -1,5 +1,7 @@
-#include <getopt.h>
 #include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
 
 #include "bootimg.h"
 
@@ -7,7 +9,7 @@
   Patch Boot Image
 *********************/
 
-static int usage(char *arg0) {
+static void usage(char *arg0) {
 	fprintf(stderr, "Boot Image Unpack/Repack Tool\n");
 	fprintf(stderr, "%s --unpack <bootimage>\n", arg0);
 	fprintf(stderr, "  Unpack <bootimage> into current directory\n\n");
@@ -15,30 +17,34 @@ static int usage(char *arg0) {
 	fprintf(stderr, "  Repack kernel, dtb, ramdisk... from current directory to new-image.img\n  <bootimage> is the image you've just unpacked\n\n");
 	fprintf(stderr, "%s --hexpatch <bootimage> <hexpattern1> <hexpattern2>\n", arg0);
 	fprintf(stderr, "  Search <hexpattern1> in <bootimage>, and replace with <hexpattern2>\n\n");
-	return 1;
+	exit(1);
+}
+
+void error(int rc, const char *msg, ...) {
+	va_list	ap;
+	va_start(ap, msg);
+	vfprintf(stderr, msg, ap);
+	fprintf(stderr,"\n\n");
+	va_end(ap);
+	exit(rc);
 }
 
 int main(int argc, char *argv[]) {
-	char ch;
-	struct option long_options[] = {
-		{"unpack", required_argument, NULL, 'u'},
-		{"repack", required_argument, NULL, 'r'},
-		{"hexpatch", required_argument, NULL, 'p'},
-		{NULL, 0, NULL, 0}
-	};
-	while ((ch = getopt_long(argc, argv, "e:r:p:", long_options, NULL)) != -1) {
-		switch (ch) {
-			case 'e':
-				return unpack(optarg);
-			case 'r':
-				return repack(optarg);
-			case 'p':
-				if (argc < 5) return usage(argv[0]);
-				optind += 2;
-				return hexpatch(argv[optind - 3], argv[optind - 2], argv[optind - 1]);
-			default:
-				return usage(argv[0]);
-		}
+	if (argc < 3)
+		usage(argv[0]);
+
+	if (strcmp(argv[1], "--unpack") == 0) {
+		unpack(argv[2]);
+	} else if (strcmp(argv[1], "--repack") == 0) {
+		repack(argv[2]);
+	} else if (strcmp(argv[1], "--hexpatch") == 0) {
+		if (argc < 5)
+			usage(argv[0]);
+		hexpatch(argv[2], argv[3], argv[4]);
+	} else {
+		usage(argv[0]);
 	}
+
 	return 0;
+
 }

jni/bootimgtools/parseimg.c

@@ -0,0 +1,232 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <string.h>
+
+#include "bootimg.h"
+#include "elf.h"
+
+void print_header() {
+	printf("KERNEL [%d] @ 0x%08x\n", hdr.kernel_size, hdr.kernel_addr);
+	printf("RAMDISK [%d] @ 0x%08x\n", hdr.ramdisk_size, hdr.ramdisk_addr);
+	printf("SECOND [%d] @ 0x%08x\n", hdr.second_size, hdr.second_addr);
+	printf("DTB [%d] @ 0x%08x\n", hdr.dt_size, hdr.tags_addr);
+	printf("PAGESIZE [%d]\n", hdr.page_size);
+	if (hdr.os_version != 0) {
+		int a,b,c,y,m = 0;
+		int os_version, os_patch_level;
+		os_version = hdr.os_version >> 11;
+		os_patch_level = hdr.os_version & 0x7ff;
+		
+		a = (os_version >> 14) & 0x7f;
+		b = (os_version >> 7) & 0x7f;
+		c = os_version & 0x7f;
+		printf("OS_VERSION [%d.%d.%d]\n", a, b, c);
+		
+		y = (os_patch_level >> 4) + 2000;
+		m = os_patch_level & 0xf;
+		printf("PATCH_LEVEL [%d-%02d]\n", y, m);
+	}
+	printf("NAME [%s]\n", hdr.name);
+	printf("CMDLINE [%s]\n", hdr.cmdline);
+}
+
+static void page_align(unsigned char **pos) {
+	uint32_t itemsize = *pos - base, pagemask = hdr.page_size - 1L;
+	if (itemsize & pagemask) {
+		*pos += hdr.page_size - (itemsize & pagemask);
+	}
+}
+
+static void elf_header_check(void *elf, int is64) {
+
+	size_t e_size, mach, ver, p_size, p_num, s_size, s_num;
+	size_t r_e_size, r_p_size, r_s_size;
+
+	if (is64) {
+		e_size = ((elf64_ehdr *) elf)->e_ehsize;
+		mach = ((elf64_ehdr *) elf)->e_machine;
+		ver = ((elf64_ehdr *) elf)->e_version;
+		p_size = ((elf64_ehdr *) elf)->e_phentsize;
+		p_num = ((elf64_ehdr *) elf)->e_phnum;
+		s_size = ((elf64_ehdr *) elf)->e_shentsize;
+		s_num = ((elf64_ehdr *) elf)->e_shnum;
+		r_e_size = sizeof(elf64_ehdr);
+		r_p_size = sizeof(elf64_phdr);
+		r_s_size = sizeof(elf64_shdr);
+	} else {
+		e_size = ((elf32_ehdr *) elf)->e_ehsize;
+		mach = ((elf32_ehdr *) elf)->e_machine;
+		ver = ((elf32_ehdr *) elf)->e_version;
+		p_size = ((elf32_ehdr *) elf)->e_phentsize;
+		p_num = ((elf32_ehdr *) elf)->e_phnum;
+		s_size = ((elf32_ehdr *) elf)->e_shentsize;
+		s_num = ((elf32_ehdr *) elf)->e_shnum;
+		r_e_size = sizeof(elf32_ehdr);
+		r_p_size = sizeof(elf32_phdr);
+		r_s_size = sizeof(elf32_shdr);
+	}
+
+	if (e_size != r_e_size)
+		error(1, "Header size not %d", r_e_size);
+
+	if (mach != EM_ARM)
+		error(1, "ELF machine is not ARM");
+
+	if (ver != 1)
+		error(1, "Unknown ELF version");
+
+	if (p_size != r_p_size)
+		error(1, "Program header size not %d", r_p_size);
+
+	if (p_num < 2 || p_num > 4)
+		error(1, "Unexpected number of elements: %d", p_num);
+
+	if (s_num && s_size != r_s_size)
+		error(1, "Section header size not %d", r_s_size);
+
+	if (s_num > 1)
+		error(1, "More than one section header");
+}
+
+static void elf_set(int i, size_t size, size_t offset, size_t addr) {
+	if (size <= 4096) {
+		// Possible cmdline
+		memset(hdr.cmdline, 0, BOOT_ARGS_SIZE);
+		strncpy((char *) hdr.cmdline, (char *) (base + offset), BOOT_ARGS_SIZE);
+		hdr.cmdline[strcspn((char*) hdr.cmdline, "\n")] = '\0';
+		return;
+	}
+	switch(i) {
+		case 0:
+			// kernel
+			kernel = base + offset;
+			hdr.kernel_size = size;
+			hdr.kernel_addr = addr;
+			break;
+		case 1:
+			// ramdisk
+			ramdisk = base + offset;
+			hdr.ramdisk_size = size;
+			hdr.ramdisk_addr = addr;
+			break;
+		case 2:
+			// dtb
+			dtb = base + offset;
+			hdr.dt_size = size;
+			hdr.tags_addr = addr;
+			break;
+	}
+}
+
+void parse_elf() {
+
+	// Reset boot image header
+	memset(&hdr, 0, sizeof(hdr));
+
+	// Hardcode pagesize
+	hdr.page_size = 4096;
+
+	switch(base[EI_CLASS]) {
+
+		case ELFCLASS32: {
+
+			elf32_ehdr *elf32;
+			elf32_phdr *ph32;
+			elf32_shdr *sh32;
+
+			printf("IMAGE [ELF32]\n");
+
+			elf32 = (elf32_ehdr *) base;
+
+			elf_header_check(elf32, 0);
+
+			ph32 = (elf32_phdr *) (base + elf32->e_phoff);
+			sh32 = (elf32_shdr *) (base + elf32->e_shoff);
+
+			for (int i = 0; i < elf32->e_phnum; ++i) {
+				elf_set(i, ph32[i].p_filesz, ph32[i].p_offset, ph32[i].p_paddr);
+			}
+
+			if (elf32->e_shnum) {
+				// cmdline
+				memset(hdr.cmdline, 0, BOOT_ARGS_SIZE);
+				strncpy((char *) hdr.cmdline, (char *) (base + sh32->s_offset + 8), BOOT_ARGS_SIZE);
+				hdr.cmdline[strcspn((char*) hdr.cmdline, "\n")] = '\0';
+			}
+
+			break;
+		}
+
+		case ELFCLASS64: {
+
+			elf64_ehdr *elf64;
+			elf64_phdr *ph64;
+			elf64_shdr *sh64;
+
+			printf("IMAGE [ELF64]\n");
+
+			elf64 = (elf64_ehdr *) base;
+
+			elf_header_check(elf64, 1);
+
+			ph64 = (elf64_phdr *) (base + elf64->e_phoff);
+			sh64 = (elf64_shdr *) (base + elf64->e_shoff);
+
+			for (int i = 0; i < elf64->e_phnum; ++i) {
+				elf_set(i, ph64[i].p_filesz, ph64[i].p_offset, ph64[i].p_paddr);
+			}
+
+			if (elf64->e_shnum) {
+				// cmdline
+				memset(hdr.cmdline, 0, BOOT_ARGS_SIZE);
+				strncpy((char *) hdr.cmdline, (char *) (base + sh64->s_offset + 8), BOOT_ARGS_SIZE);
+				hdr.cmdline[strcspn((char*) hdr.cmdline, "\n")] = '\0';
+			}
+			break;
+		}
+
+		default:
+			error(1, "ELF format error!");
+	}
+
+	print_header();
+}
+
+void parse_aosp() {
+
+	printf("IMG [AOSP]\n");
+
+	unsigned char *pos = base;
+
+	// Read the header
+	memcpy(&hdr, pos, sizeof(hdr));
+	pos += hdr.page_size;
+
+	// Kernel position
+	kernel = pos;
+	pos += hdr.kernel_size;
+	page_align(&pos);
+
+	// Ramdisk position
+	ramdisk = pos;
+	pos += hdr.ramdisk_size;
+	page_align(&pos);
+
+	if (hdr.second_size) {
+		// Second position
+		second = pos;
+		pos += hdr.second_size;
+		page_align(&pos);
+	}
+
+	if (hdr.dt_size) {
+		// dtb position
+		dtb = pos;
+		pos += hdr.dt_size;
+		page_align(&pos);
+	}
+
+	print_header();
+}

jni/bootimgtools/repack.c

@@ -10,12 +10,12 @@
 #include <string.h>
 
 #include "bootimg.h"
+#include "elf.h"
 
 // Global pointer of current positions
-static void *ibase, *ipos;
 static int ofd, opos;
 
-static size_t dump(const char *filename) {
+static size_t restore(const char *filename) {
 	int fd = open(filename, O_RDONLY);
 	if (fd < 0) {
 		fprintf(stderr, "Cannot open %s\n", filename);
@@ -32,39 +32,51 @@ static size_t dump(const char *filename) {
 	return size;
 }
 
-static void dump_buf(size_t size, const void *buf) {
-	if (write(ofd, buf, size) < 0) {
+static void restore_buf(size_t size, const void *buf) {
+	if (write(ofd, buf, size) != size) {
 		fprintf(stderr, "Cannot dump from input file\n");
 		exit(1);
 	}
 	opos += size;
 }
 
-static void in_page_align(uint32_t pagesize) {
-	uint32_t itemsize = ipos - ibase, pagemask = pagesize - 1L;
-	if (itemsize & pagemask) {
-		ipos += pagesize - (itemsize & pagemask);
-	}
-}
-
-static void out_page_align(uint32_t pagesize) {
-	uint32_t pagemask = pagesize - 1L;
+static void page_align() {
+	uint32_t pagemask = hdr.page_size - 1L;
 	if (opos & pagemask) {
-		opos += pagesize - (opos & pagemask);
+		opos += hdr.page_size - (opos & pagemask);
 	}
 	ftruncate(ofd, opos);
 	lseek(ofd, 0, SEEK_END);
 }
 
-static int aosp() {
-	printf("AOSP Boot Image Detected\n");
+int repack(const char* image) {
+	// Load original boot
+	int ifd = open(image, O_RDONLY), ret = -1;
+	if (ifd < 0)
+		error(1, "Cannot open %s", image);
+
+	size_t isize = lseek(ifd, 0, SEEK_END);
+	lseek(ifd, 0, SEEK_SET);
+	unsigned char *orig = mmap(NULL, isize, PROT_READ, MAP_SHARED, ifd, 0);
+
+	// Create new boot image
+	unlink("new-boot.img");
+	ofd = open("new-boot.img", O_RDWR | O_CREAT, 0644);
+
+	// Parse images
+	for(base = orig; base < (orig + isize); base += 256) {
+		if (memcmp(base, BOOT_MAGIC, BOOT_MAGIC_SIZE) == 0) {
+			parse_aosp();
+			break;
+		} else if (memcmp(base, ELF_MAGIC, ELF_MAGIC_SIZE) == 0) {
+			parse_elf();
+			break;
+		}
+	}
+
+	printf("\n");
 
 	char *name;
-	boot_img_hdr hdr, ihdr;
-
-	// Read the original header
-	memcpy(&ihdr, ibase, sizeof(ihdr));
-	hdr = ihdr;
 	
 	// Set all sizes to 0
 	hdr.kernel_size = 0;
@@ -72,27 +84,24 @@ static int aosp() {
 	hdr.second_size = 0;
 	hdr.dt_size = 0;
 
-	// Skip a page
+	// Skip a page for header
 	ftruncate(ofd, hdr.page_size);
 	lseek(ofd, 0, SEEK_END);
 	opos += hdr.page_size;
-	ipos = ibase + hdr.page_size;
 
-	// Dump zImage
-	if (memcmp(ipos, "\x88\x16\x88\x58", 4) == 0) {
-		printf("Dumping MTK header back to zImage\n");
-		dump_buf(512, ipos);
+	// Restore kernel
+	if (memcmp(kernel, "\x88\x16\x88\x58", 4) == 0) {
+		printf("Dumping MTK header back to kernel\n");
+		restore_buf(512, kernel);
 		hdr.kernel_size += 512;
 	}
-	hdr.kernel_size += dump("kernel");
-	ipos += ihdr.kernel_size;
-	in_page_align(hdr.page_size);
-	out_page_align(hdr.page_size);
+	hdr.kernel_size += restore("kernel");
+	page_align();
 
 	// Dump ramdisk
-	if (memcmp(ipos, "\x88\x16\x88\x58", 4) == 0) {
+	if (memcmp(ramdisk, "\x88\x16\x88\x58", 4) == 0) {
 		printf("Dumping MTK header back to ramdisk\n");
-		dump_buf(512, ipos);
+		restore_buf(512, ramdisk);
 		hdr.ramdisk_size += 512;
 	}
 	if (access("ramdisk.gz", R_OK) == 0) {
@@ -108,50 +117,31 @@ static int aosp() {
 	} else if (access("ramdisk.lz4", R_OK) == 0) {
 		name = "ramdisk.lz4";
 	} else {
-		fprintf(stderr, "Ramdisk file doesn't exist!\n");
-		return 1;
+		error(1, "Ramdisk file doesn't exist!");
 	}
-	hdr.ramdisk_size += dump(name);
-	out_page_align(hdr.page_size);
+	hdr.ramdisk_size += restore(name);
+	page_align();
 
 	// Dump second
 	if (access("second", R_OK) == 0) {
-		hdr.second_size += dump("second");
-		out_page_align(hdr.page_size);
+		hdr.second_size += restore("second");
+		page_align();
 	}
 
 	// Dump dtb
 	if (access("dtb", R_OK) == 0) {
-		hdr.dt_size += dump("dtb");
-		out_page_align(hdr.page_size);
+		hdr.dt_size += restore("dtb");
+		page_align();
 	}
 
+	print_header();
+
 	// Write header back
 	lseek(ofd, 0, SEEK_SET);
 	write(ofd, &hdr, sizeof(hdr));
 
-	return 0;
-}
-
-int repack(const char* image) {
-	// Load original boot
-	int ifd = open(image, O_RDONLY), ret = -1;
-	size_t isize = lseek(ifd, 0, SEEK_END);
-	lseek(ifd, 0, SEEK_SET);
-	void *orig = mmap(NULL, isize, PROT_READ, MAP_SHARED, ifd, 0);
-
-	// Create new boot image
-	unlink("new-boot.img");
-	ofd = open("new-boot.img", O_RDWR | O_CREAT, 0644);
-
-	// Check headers
-	for(ibase = orig; ibase < (orig + isize); ibase += 256) {
-		if (memcmp(ibase, BOOT_MAGIC, BOOT_MAGIC_SIZE) == 0) {
-			ret = aosp();
-			break;
-		}
-	}
 	munmap(orig, isize);
 	close(ifd);
+	close(ofd);
 	return ret;
 }

jni/bootimgtools/unpack.c

@@ -10,119 +10,100 @@
 #include <string.h>
 
 #include "bootimg.h"
+#include "elf.h"
 
-// Global pointer of current positions
-static unsigned char *base, *pos;
-
-static void dump(size_t size, const char *filename) {
+static void dump(unsigned char *buf, size_t size, const char *filename) {
 	unlink(filename);
 	int ofd = open(filename, O_WRONLY | O_CREAT, 0644);
-	assert(ofd >= 0);
-	int ret = write(ofd, pos, size);
-	assert(ret == size);
+	if (ofd < 0)
+		error(1, "Cannot open %s", filename);
+	if (write(ofd, buf, size) != size)
+		error(1, "Cannot dump %s", filename);
 	close(ofd);
-	pos += size;
-}
-
-static void page_align(uint32_t pagesize) {
-	uint32_t itemsize = pos - base, pagemask = pagesize - 1L;
-	if (itemsize & pagemask) {
-		pos += pagesize - (itemsize & pagemask);
-	}
-}
-
-static int aosp() {
-	printf("AOSP Boot Image Detected\n");
-
-	char name[PATH_MAX], *ext;
-
-	// Read the header
-	boot_img_hdr hdr;
-	memcpy(&hdr, base, sizeof(hdr));
-
-	pos = base + hdr.page_size;
-
-	// Dump zImage
-	if (memcmp(pos, "\x88\x16\x88\x58", 4) == 0) {
-		printf("MTK header found in zImage\n");
-		pos += 512;
-		hdr.kernel_size -= 512;
-	}
-	dump(hdr.kernel_size, "kernel");
-	page_align(hdr.page_size);
-
-	// Dump ramdisk
-	if (memcmp(pos, "\x88\x16\x88\x58", 4) == 0) {
-		printf("MTK header found in ramdisk\n");
-		pos += 512;
-		hdr.ramdisk_size -= 512;
-	}
-	// Compression detection
-	if (memcmp(pos, "\x1f\x8b\x08\x00", 4) == 0) {
-		// gzip header
-		printf("gzip ramdisk format detected!\n");
-		ext = "gz";
-	} else if (memcmp(pos, "\x89\x4c\x5a\x4f\x00\x0d\x0a\x1a\x0a", 9) == 0) {
-		// lzop header
-		printf("lzop ramdisk format detected!\n");
-		ext = "lzo";
-	} else if (memcmp(pos, "\xfd""7zXZ\x00", 6) == 0) {
-		// xz header
-		printf("xz ramdisk format detected!\n");
-		ext = "xz";
-	} else if (memcmp(pos, "\x5d\x00\x00", 3) == 0 
-			&& (pos[12] == (unsigned char) '\xff' || pos[12] == (unsigned char) '\x00')) {
-		// lzma header
-		printf("lzma ramdisk format detected!\n");
-		ext = "lzma";
-	} else if (memcmp(pos, "BZh", 3) == 0) {
-		// bzip2 header
-		printf("bzip2 ramdisk format detected!\n");
-		ext = "bz2";
-	} else if ( (  memcmp(pos, "\x04\x22\x4d\x18", 4) == 0 
-				|| memcmp(pos, "\x03\x21\x4c\x18", 4) == 0) 
-				|| memcmp(pos, "\x02\x21\x4c\x18", 4) == 0) {
-		// lz4 header
-		printf("lz4 ramdisk format detected!\n");
-		ext = "lz4";
-	} else {
-		fprintf(stderr, "Unknown ramdisk format!\n");
-		return 1;
-	}
-	sprintf(name, "%s.%s", "ramdisk", ext);
-	dump(hdr.ramdisk_size, name);
-	page_align(hdr.page_size);
-
-	if (hdr.second_size) {
-		// Dump second
-		dump(hdr.second_size, "second");
-		page_align(hdr.page_size);
-	}
-
-	if (hdr.dt_size) {
-		// Dump dtb
-		dump(hdr.dt_size, "dtb");
-		page_align(hdr.page_size);
-	}
-
-	return 0;
 }
 
 int unpack(const char* image) {
 	int fd = open(image, O_RDONLY), ret = 0;
+	if (fd < 0)
+		error(1, "Cannot open %s", image);
+
 	size_t size = lseek(fd, 0, SEEK_END);
 	lseek(fd, 0, SEEK_SET);
 	unsigned char *orig = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
 
-	// Check headers
+	// Parse images
 	for(base = orig; base < (orig + size); base += 256) {
 		if (memcmp(base, CHROMEOS_MAGIC, CHROMEOS_MAGIC_SIZE) == 0) {
-			dump(0, "chromeos");
+			dump(base, 0, "chromeos");
 		} else if (memcmp(base, BOOT_MAGIC, BOOT_MAGIC_SIZE) == 0) {
-			ret = aosp();
+			parse_aosp();
+			break;
+		} else if (memcmp(base, ELF_MAGIC, ELF_MAGIC_SIZE) == 0) {
+			parse_elf();
 			break;
 		}
 	}
+
+	char name[PATH_MAX], *ext;
+
+	// Dump kernel
+	if (memcmp(kernel, "\x88\x16\x88\x58", 4) == 0) {
+		printf("MTK header found in kernel\n");
+		kernel += 512;
+		hdr.kernel_size -= 512;
+	}
+	dump(kernel, hdr.kernel_size, "kernel");
+
+	// Dump ramdisk
+	if (memcmp(ramdisk, "\x88\x16\x88\x58", 4) == 0) {
+		printf("MTK header found in ramdisk\n");
+		ramdisk += 512;
+		hdr.ramdisk_size -= 512;
+	}
+	// Compression detection
+	if (memcmp(ramdisk, "\x1f\x8b\x08\x00", 4) == 0) {
+		// gzip header
+		printf("COMPRESSION [gzip]\n");
+		ext = "gz";
+	} else if (memcmp(ramdisk, "\x89\x4c\x5a\x4f\x00\x0d\x0a\x1a\x0a", 9) == 0) {
+		// lzop header
+		printf("COMPRESSION [lzop]\n");
+		ext = "lzo";
+	} else if (memcmp(ramdisk, "\xfd""7zXZ\x00", 6) == 0) {
+		// xz header
+		printf("COMPRESSION [xz]\n");
+		ext = "xz";
+	} else if (memcmp(ramdisk, "\x5d\x00\x00", 3) == 0 
+			&& (ramdisk[12] == (unsigned char) '\xff' || ramdisk[12] == (unsigned char) '\x00')) {
+		// lzma header
+		printf("COMPRESSION [lzma]\n");
+		ext = "lzma";
+	} else if (memcmp(ramdisk, "BZh", 3) == 0) {
+		// bzip2 header
+		printf("COMPRESSION [bzip2]\n");
+		ext = "bz2";
+	} else if ( (  memcmp(ramdisk, "\x04\x22\x4d\x18", 4) == 0 
+				|| memcmp(ramdisk, "\x03\x21\x4c\x18", 4) == 0) 
+				|| memcmp(ramdisk, "\x02\x21\x4c\x18", 4) == 0) {
+		// lz4 header
+		printf("COMPRESSION [lz4]\n");
+		ext = "lz4";
+	} else {
+		error(1, "Unknown ramdisk format!");
+	}
+	sprintf(name, "%s.%s", "ramdisk", ext);
+	dump(ramdisk, hdr.ramdisk_size, name);
+
+	if (hdr.second_size) {
+		// Dump second
+		dump(second, hdr.second_size, "second");
+	}
+
+	if (hdr.dt_size) {
+		// Dump dtb
+		dump(dtb, hdr.dt_size, "dtb");
+	}
+
 	munmap(orig, size);
 	close(fd);
 	return ret;