76 lines
1.9 KiB
Plaintext
76 lines
1.9 KiB
Plaintext
#
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# Matter_Base38.be - suppport for Base38 encoding which is used in QR Codes
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#
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# Copyright (C) 2023 Stephan Hadinger & Theo Arends
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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 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 General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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import matter
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#@ solidify:Matter_Base38,weak
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class Matter_Base38
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static def encode(raw)
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# encodes b38 (mutates `b`)
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def b38_enc(v, l)
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var ENCODE = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-."
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var i = 0
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var ret = ""
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while i < l
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ret += ENCODE[v % 38]
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v = v / 38
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i += 1
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end
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return ret
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end
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var idx = 0
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var sz = size(raw)
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var out = ""
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while idx < sz
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var val
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if idx + 2 < sz
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# encode 3 bytes
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val = raw[idx] | (raw[idx+1] << 8) | (raw[idx+2] << 16)
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out += b38_enc(val, 5)
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idx += 3
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elif idx + 1 < sz
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# encode 2 bytes
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val = raw[idx] | (raw[idx+1] << 8)
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out += b38_enc(val, 4)
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idx += 2
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else
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# encode 1 byte
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val = raw[idx]
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out += b38_enc(val, 2)
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idx += 1
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end
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end
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return out
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end
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end
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matter.Base38 = Matter_Base38
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#-
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assert(matter.Base38.encode(bytes("DEADBEEF")) == "C.R.5B6")
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assert(matter.Base38.encode(bytes("")) == "")
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assert(matter.Base38.encode(bytes("00")) == "00")
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assert(matter.Base38.encode(bytes("FFFFFFFF")) == "PLS18R6")
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-#
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