49 lines
1.2 KiB
Python
Executable File
49 lines
1.2 KiB
Python
Executable File
#!/usr/bin/python3
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"""
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Extract the fonts and create pickled dictionaries mapping characters to the raw binary
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strings representing each entry. Parsing these strings is done in the client code.
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"""
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import struct
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import pickle
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alpha_ft_start = 0x2569
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point_ft_start = 0x3153
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f = open("ROM.bin","rb")
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data = f.read()
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def eot(ft, off):
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"Returns true if the offset is at the end of the table."
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# Presumes that every table terminates in 0xff
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return data[ft + off*2] == 0xff
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def get_char(ft,off):
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"Returns the character data (sans terminating 0xff)"
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achar = chr(off+0x20)
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o1 = ft + (off*2)
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o2 = (data[o1+1]*256) + data[o1]
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o3 = o2
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while data[o3] != 0xff:
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o3 += 1
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return data[o2:o3]
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def build_char_dict(ft, first_char=0):
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offset = 0
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d = {}
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while not eot(ft,offset):
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cur_char = chr(offset+first_char)
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d[cur_char] = get_char(ft,offset)
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offset += 1
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return d
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def pickle_font(path, ft, first_char=0):
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f = open(path,"wb")
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d = build_char_dict(ft,first_char)
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pickle.dump(d,f)
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pickle_font("a410_chars.pickle",alpha_ft_start,ord(' '))
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pickle_font("a410_points.pickle",point_ft_start)
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