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35 lines
1.2 KiB
35 lines
1.2 KiB
#!/usr/bin/env python3 |
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""" |
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To fit the whole game into one memory bank, the dictionary is compressed. |
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Since only 2^5 combinations are needed to store 26 letters, |
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5 bits would be enough; for simplicity's sake, however, we take 6. |
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This way we can reduce the memory consumption by 20%. |
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""" |
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import struct |
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def compress(in_path: str, out_path:str): |
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with open(in_path, "r") as dictionary, open(out_path, "wb") as data: |
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while True: |
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word = dictionary.readline() |
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if not word: |
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break |
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word = word.strip() |
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# skip words with double letters |
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if len(set(list(word))) != len(word): |
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continue |
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a = (((ord(word[0])-0x60) << 2) & 0x00fc) | \ |
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(((ord(word[1])-0x60) >> 4) & 0x0003) |
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b = (((ord(word[1])-0x60) << 4) & 0x00f0) | \ |
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(((ord(word[2])-0x60) >> 2) & 0x000f) |
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c = (((ord(word[2])-0x60) << 6) & 0x00c0) | \ |
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(((ord(word[3])-0x60) >> 0) & 0x003f); |
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d = (((ord(word[4])-0x60) << 2) & 0x00fc) |
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pack = struct.pack("BBBB", a, b, c, d) |
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data.write(pack) |
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compress("en.txt", "en.dat") |
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