1 files changed, 73 insertions, 0 deletions
diff --git a/io_import_dxf/dxfgrabber/tags.py b/io_import_dxf/dxfgrabber/tags.py
new file mode 100755
index 00000000..fed6aa88
--- /dev/null
+++ b/io_import_dxf/dxfgrabber/tags.py
@@ -0,0 +1,73 @@
+# Purpose: tag reader
+# Created: 21.07.2012, taken from my ezdxf project
+# Copyright (C) 2012, Manfred Moitzi
+# License: MIT License
+from __future__ import unicode_literals
+__author__ = "mozman <mozman@gmx.at>"
+
+import os
+from .const import ENV_CYTHON
+
+OPTIMIZE = True
+if ENV_CYTHON in os.environ:
+    if os.environ[ENV_CYTHON].upper() in ('1', 'ON', 'TRUE'):
+        OPTIMIZE = True
+    else:
+        OPTIMIZE = False
+try:
+    if not OPTIMIZE:
+        raise ImportError
+    CYTHON_EXT = True
+    from.cytags import TagIterator, Tags, TagGroups, DXFTag, NONE_TAG
+    from.cytags import DXFStructureError, StringIterator, ClassifiedTags
+except ImportError:
+    CYTHON_EXT = False
+    from.pytags import TagIterator, Tags, TagGroups, DXFTag, NONE_TAG
+    from.pytags import DXFStructureError, StringIterator, ClassifiedTags
+
+
+import sys
+from .codepage import toencoding
+from .const import acadrelease
+from array import array
+
+
+class DXFInfo(object):
+    def __init__(self):
+        self.release = 'R12'
+        self.version = 'AC1009'
+        self.encoding = 'cp1252'
+        self.handseed = '0'
+
+    def DWGCODEPAGE(self, value):
+        self.encoding = toencoding(value)
+
+    def ACADVER(self, value):
+        self.version = value
+        self.release = acadrelease.get(value, 'R12')
+
+    def HANDSEED(self, value):
+        self.handseed = value
+
+
+def dxfinfo(stream):
+    info = DXFInfo()
+    tag = DXFTag(999999, '')
+    tagreader = TagIterator(stream)
+    while tag != DXFTag(0, 'ENDSEC'):
+        tag = next(tagreader)
+        if tag.code != 9:
+            continue
+        name = tag.value[1:]
+        method = getattr(info, name, None)
+        if method is not None:
+            method(next(tagreader).value)
+    return info
+
+
+def binary_encoded_data_to_bytes(data):
+    PY3 = sys.version_info[0] >= 3
+    byte_array = array('B' if PY3 else b'B')
+    for text in data:
+        byte_array.extend(int(text[index:index+2], 16) for index in range(0, len(text), 2))
+    return byte_array.tobytes() if PY3 else byte_array.tostring()