46 lines
1.3 KiB
Python
Executable File
46 lines
1.3 KiB
Python
Executable File
#!/usr/bin/env python3
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# synacor.py - An implementation of the Synacor Challenge
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# Copyright © 2017 RunasSudo
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import struct
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import sys
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if len(sys.argv) < 3:
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print('Usage: {} <input> <output>'.format(sys.argv[0]))
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else:
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# Read code into memory
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SYN_MEM = [0] * 32768
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with open(sys.argv[1], 'rb') as data:
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i = 0
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while True:
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byteData = data.read(2)
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if len(byteData) < 2:
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break
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SYN_MEM[i] = struct.unpack('<H', byteData)[0]
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i += 1
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# Emulate 06bb
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for R1 in range(0x17b4, 0x7562):
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R0 = SYN_MEM[R1]
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R0 ^= pow(R1, 2, 32768)
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R0 ^= 0x4154
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SYN_MEM[R1] = R0
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# Write
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with open(sys.argv[2], 'wb') as f:
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f.write(struct.pack('<32768H', *SYN_MEM))
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