dump ijc (java card applet) file.

ijc_dump.py

#!/usr/bin/python
import sys

comp_tag_names = [
        "None",
        "Header",               # 1
        "Directory",            # 2
        "Applet",               # 3
        "Import",               # 4
        "ConstantPool",         # 5
        "Class",                # 6
        "Method",               # 7
        "StaticField",          # 8
        "ReferenceLocation",    # 9
        "Export",               # 10
        "Descriptor",           # 11
        "Deubg"                 # 12
        ]

components_install = [1, 2, 4, 3, 6, 7, 8, 10, 5, 9]

def prt(x):
    print x

# bytearray -> [(tag, bytearray)]
def get_components(data):
    if len(data) == 0:
        return []
    tag, size = (data[0], 256*data[1] + data[2])
    return [(tag, data[3:size+3])] + get_components(data[size+3:])

def get_rawcode(cmps):
    raw = bytearray()
    cmps_code = sum([filter(lambda (tag, data) : tag == i, cmps) for i in components_install], [])
    for x in cmps_code: 
        tag, data = x
        raw += data 
    return raw

def hexdump(data):
    map(lambda x: prt("\t" + " ".join("{:02X}".format(int(i)) for i in x)),
        [data[x:x+16] for x in range(0, len(data), 16)])

def dump_component(com):
    tag, data = com
    print "\n", comp_tag_names[tag], ":", len(data), "bytes"
    hexdump(data)

if __name__ == "__main__":
    if len(sys.argv) == 1:
        print "Help:", sys.argv[0], "[ijc file]"
        exit(1) 

    with open(sys.argv[1], "rb") as f:
        comps = get_components(bytearray(f.read()))
        map(lambda x: dump_component(x), comps)
        hexdump(get_rawcode(comps))