refactor: excel parse

2026-04-16 10:01:11 +08:00
parent 680ecc320f
commit f62f95ec02
7941 changed files with 2899112 additions and 0 deletions
@@ -0,0 +1,58 @@
+# Purpose: decode/encode DXF proprietary data
+# Created: 01.05.2014
+# Copyright (c) 2014-2018, Manfred Moitzi
+# License: MIT License
+from typing import Iterable
+
+_decode_table = {
+    0x20: ' ',
+    0x40: '_',
+    0x5F: '@',
+}
+for c in range(0x41, 0x5F):
+    _decode_table[c] = chr(0x41 + (0x5E - c))  # 0x5E -> 'A', 0x5D->'B', ...
+
+
+def decode(text_lines: Iterable[str]) -> Iterable[str]:
+    """ Decode the Standard :term:`ACIS` Text (SAT) format "encrypted" by AutoCAD. """
+    def _decode(text):
+        dectab = _decode_table  # fast local var
+        s = []
+        text = bytes(text, 'ascii')
+        skip = False
+        for c in text:
+            if skip:
+                skip = False
+                continue
+            if c in dectab:
+                s += dectab[c]
+                skip = (c == 0x5E)  # skip space after 'A'
+            else:
+                s += chr(c ^ 0x5F)
+        return ''.join(s)
+    return (_decode(line) for line in text_lines)
+
+
+_encode_table = {
+    ' ': ' ',  # 0x20
+    '_': '@',  # 0x40
+    '@': '_',  # 0x5F
+}
+for c in range(0x41, 0x5F):
+    _encode_table[chr(c)] = chr(0x5E - (c - 0x41))  # 0x5E->'A', 'B'->0x5D, ...
+
+
+def encode(text_lines: Iterable[str]) -> Iterable[str]:
+    """ Encode the Standard :term:`ACIS` Text (SAT) format by AutoCAD "encryption" algorithm. """
+    def _encode(text):
+        s = []
+        enctab = _encode_table  # fast local var
+        for c in text:
+            if c in enctab:
+                s += enctab[c]
+                if c == 'A':
+                    s += ' '  # append a space for an 'A' -> cryptography
+            else:
+                s += chr(ord(c) ^ 0x5F)
+        return ''.join(s)
+    return (_encode(line) for line in text_lines)