81 lines
2.1 KiB
Python
81 lines
2.1 KiB
Python
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#!/usr/bin/env python
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# currently only extracts text metadata
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import sys
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def error(msg):
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print(msg)
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sys.exit(1)
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def parsestr(data, start):
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end = start + data[start:].find(b'\0')
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return end + 1, data[start:end].decode('ascii')
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def parsefields(data, pos0):
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pos1, name = parsestr(data, pos0)
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pos2, version = parsestr(data, pos1)
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pos3, author = parsestr(data, pos2)
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pos4, desc = parsestr(data, pos3)
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return {'name': name, 'version': version, 'author': author, 'desc': desc}
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def parse(data, pos0):
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if len(data[pos0:]) < 6:
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raise Exception('not enough data!')
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a,b,c,d,e,f = data[pos0:pos0+6]
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if a != 0xa0 or d != 0x80 or f != 0x37:
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return None
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else:
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return (e, b, c)
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def toaddr(x, y):
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return x * 256 + y - 256
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def main():
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if len(sys.argv[1:]) != 1:
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print('usage: %s ROMFILE' % sys.argv[0])
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sys.exit(1)
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f = open(sys.argv[1], 'rb')
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data = f.read()
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f.close()
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if len(data) < 6:
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return error("file too small: %d bytes" % len(data))
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(kind, x, y) = parse(data, 0)
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if kind != 0xf0:
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head = ''.join(['%02x' % n for n in data[0:6]])
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return error("file should start with 'a0____804037' but got %r" % head)
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icon_type = None
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icon_data = None
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i = 6
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while True:
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res = parse(data, i)
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if res is None:
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break
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i += 6
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kind, x, y = res
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xy = '%02x%02x' % (x, y)
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if kind == 0xf2:
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fields = parsefields(data, toaddr(x, y))
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print('fields: %r' % fields)
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elif kind == 0xf4:
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icon_type = x * 256 - y
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print('icon type: %s' % xy)
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elif kind == 0xf6:
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# TODO: extract icon data as BMP or similar
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print('icon data at %s' % xy)
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elif kind == 0xf8:
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print('maximum memory address is %s' % xy)
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elif kind == 0xfa:
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# TODO: parse manifest structure
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print('manifest data at %s' % xy)
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else:
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print('unknown field: %02x (%s)' % (kind, xy))
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if __name__ == "__main__":
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main()
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