87 lines
2.4 KiB
Python
Executable File
87 lines
2.4 KiB
Python
Executable File
#!/usr/bin/env python3
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import os
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import struct
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import sys
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COMBO_FIELDS = {
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0x40: 'AppleTalk1',
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0x20: 'AppleTalk2',
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0x30: 'AppleTalk2_NetBoot_FPU',
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0x08: 'AppleTalk2_NetBoot_NoFPU',
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0x10: 'NetBoot',
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0x78: 'AllCombos',
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}
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def pad_offset(offset, align):
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(offset + align - 1) & ~(align - 1)
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class Rsrc:
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def __init__(self, rom_bin, struct_offset):
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self.struct_offset = struct_offset
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rsrc_s_fmt = '> B 7x L L 4s h c 256p' # Struct actually padded to 16b to fit pstring
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rsrc_s_len = struct.calcsize(rsrc_s_fmt)
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rsrc_s = rom_bin[self.struct_offset : self.struct_offset + rsrc_s_len]
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rsrc_s_tuple = struct.unpack(rsrc_s_fmt, rsrc_s)
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(self.combo_field,
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self.next_offset, self.data_offset,
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self.type, self.id,
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attrs, self.name) = rsrc_s_tuple
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self.combo_field = COMBO_FIELDS.get(self.combo_field, 'UnknownComboField0x%X'%self.combo_field)
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rsrc_s_len_actual = pad_offset(rsrc_s_len - 256 + len(self.name), 16)
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mm_header_fmt = '> L L L'
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mm_header_len = struct.calcsize(mm_header_fmt)
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mm_header = rom_bin[self.data_offset - mm_header_len : self.data_offset]
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mm_header_tuple = struct.unpack(mm_header_fmt, mm_header)
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(mm_attrs, block_len, mm_bogus_ptr_ptr) = mm_header_tuple
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self.data = rom_bin[self.data_offset : self.data_offset + block_len - mm_header_len]
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if __name__ == '__main__':
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try:
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_, src, dest = sys.argv
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except ValueError:
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print('USAGE: %s SRC.ROM DEST-DIR' % (sys.argv[0]))
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exit(1)
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with open(src, 'rb') as f:
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rom_bin = f.read()
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os.makedirs(dest)
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(map_offset,) = struct.unpack('>L', rom_bin[0x1A : 0x1A + 4])
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map_s_fmt = '>Lbbhh'
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map_s_len = struct.calcsize(map_s_fmt)
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map_s = rom_bin[map_offset:map_offset + map_s_len]
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(offsetToFirst, maxValidIndex, comboFieldSize, comboVersion, headerSize) = struct.unpack(map_s_fmt, map_s)
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next_offset = offsetToFirst
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idx = 0
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while next_offset != 0:
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r = Rsrc(rom_bin, next_offset)
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fname = '%03d %s %d' % (idx, r.type.decode('ascii'), r.id)
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if r.name:
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fname += ' "%s"' % r.name.decode('ascii')
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if r.combo_field != 'AllCombos':
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fname += ' (%s)' % r.combo_field
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fname = fname.replace('/', '-')
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with open(os.path.join(dest, fname), 'wb') as f:
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f.write(r.data)
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next_offset = r.next_offset
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idx += 1
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