validate_crc.py

import sys, struct
from libpebble.stm32_crc import crc32

if __name__ == "__main__":
    
    raw = open('pebble-app.bin', 'rb').read()
    
    with open('pebble-app.bin', 'rb') as f:
        header = f.read(8+8+8+32+32+20)
        (magic, version, sdk_version, app_version, size, entry_point, crc, old_name, old_company, unknown3, jump_table, flags, reloc_list, num_relocs) = struct.unpack("<8sHHHHII32s32sIIIII", header)
        crc = long(crc)
        print (magic, version, sdk_version, app_version, size, hex(entry_point), hex(crc), old_name, old_company, unknown3, hex(jump_table), flags, hex(reloc_list), num_relocs)
        binary = f.read()
        
        print "EXP: 0x%08X (%d)" % (crc,crc)
        rc = crc32(raw[108:len(raw)-(4*num_relocs)])
        print "MIN: 0x%08X (%d)" % (rc,rc)
        rc = crc32(binary)
        print "BIN: 0x%08X (%d)" % (rc,rc)
        
        (end1,end2) = struct.unpack("<II", binary[-8:])
        print "END1: 0x%08X (%d)" % (end1, end1)
        print "END2: 0x%08X (%d)" % (end2, end2)
        print "SIZE: 0x%08X (%d)" % (size, size)
        print "DIFF: 0x%08X (%d)" % (size-end1, size-end1)
        (en1,) = struct.unpack("<I", binary[end1-108:end1+4-108])
        (en2,) = struct.unpack("<I", binary[end2-108:end2+4-108])
        print "*EN1: 0x%08X (%d)" % (en1, en1)
        print "*EN2: 0x%08X (%d)" % (en2, en2)
        (n1,) = struct.unpack("<I", binary[en1-108:en1+4-108])
        (n2,) = struct.unpack("<I", binary[en2-108:en2+4-108])
        print "**N1: 0x%08X (%d)" % (n1, n1)
        print "**N2: 0x%08X (%d)" % (n2, n2)
        
    
    #struct.pack("<8sHHHHII32s32sIIIII"
    
    #with open('pebble-app.bin', 'wb') as f:
    #    f.write(