Added a new script that can print the creation and modification dates of the
library header of any GDS file. Modified the "fakediode_2" cell to put back
the diffusion layer---this version only removes the contacts from the original
diode cell. This prevents issues with FOM fill generation when using the
fakediode cell.
diff --git a/common/get_gds_date.py b/common/get_gds_date.py
new file mode 100755
index 0000000..5e0f143
--- /dev/null
+++ b/common/get_gds_date.py
@@ -0,0 +1,116 @@
+#!/usr/bin/env python3
+# Script to read a GDS file and print out the timestamp(s).
+
+import os
+import sys
+import datetime
+
+def usage():
+ print('get_gds_date.py <path_to_gds_in> [-created | -modified]')
+
+if __name__ == '__main__':
+ debug = False
+
+ if len(sys.argv) == 1:
+ print("No options given to change_gds_date.py.")
+ usage()
+ sys.exit(0)
+
+ optionlist = []
+ arguments = []
+
+ for option in sys.argv[1:]:
+ if option.find('-', 0) == 0:
+ optionlist.append(option)
+ else:
+ arguments.append(option)
+
+ if len(arguments) != 1:
+ print("Wrong number of arguments given to get_gds_date.py.")
+ usage()
+ sys.exit(0)
+
+ created = True
+ modified = True
+
+ if '-debug' in optionlist:
+ debug = True
+ if '-created' in optionlist:
+ modified = False
+ if '-modified' in optionlist:
+ created = False
+
+ source = arguments[0]
+
+ sourcedir = os.path.split(source)[0]
+ gdsinfile = os.path.split(source)[1]
+
+ with open(source, 'rb') as ifile:
+ gdsdata = ifile.read()
+
+ datalen = len(gdsdata)
+ dataptr = 0
+ while dataptr < datalen:
+ # Read stream records up to any string, then search for search text.
+ bheader = gdsdata[dataptr:dataptr + 2]
+ reclen = int.from_bytes(bheader, 'big')
+ if reclen == 0:
+ print('Error: found zero-length record at position ' + str(dataptr))
+ break
+
+ rectype = gdsdata[dataptr + 2]
+ datatype = gdsdata[dataptr + 3]
+
+ brectype = rectype.to_bytes(1, byteorder='big')
+ bdatatype = datatype.to_bytes(1, byteorder='big')
+
+ if rectype == 1: # 1 = beginlib
+ # Datatype should be 2
+ if datatype != 2:
+ print('Error: Header data type is not 2-byte integer!')
+ if reclen != 28:
+ print('Error: Header record length is not 28!')
+ if debug:
+ print('Record type = ' + str(rectype) + ' data type = ' + str(datatype) + ' length = ' + str(reclen))
+
+ if created:
+ crec1 = gdsdata[dataptr + 4:dataptr + 6]
+ crec2 = gdsdata[dataptr + 6:dataptr + 8]
+ crec3 = gdsdata[dataptr + 8:dataptr + 10]
+ crec4 = gdsdata[dataptr + 10:dataptr + 12]
+ crec5 = gdsdata[dataptr + 12:dataptr + 14]
+ crec6 = gdsdata[dataptr + 14:dataptr + 16]
+
+ modyear = int.from_bytes(crec1, 'big')
+ year = modyear + 1900
+ month = int.from_bytes(crec2, 'big')
+ day = int.from_bytes(crec3, 'big')
+ hour = int.from_bytes(crec4, 'big')
+ minute = int.from_bytes(crec5, 'big')
+ second = int.from_bytes(crec6, 'big')
+
+ print('Created date: {}-{}-{}-{}-{}-{}'.format(year, month, day, hour, minute, second))
+
+ if modified:
+ mrec1 = gdsdata[dataptr + 16:dataptr + 18]
+ mrec2 = gdsdata[dataptr + 18:dataptr + 20]
+ mrec3 = gdsdata[dataptr + 20:dataptr + 22]
+ mrec4 = gdsdata[dataptr + 22:dataptr + 24]
+ mrec5 = gdsdata[dataptr + 24:dataptr + 26]
+ mrec6 = gdsdata[dataptr + 26:dataptr + 28]
+
+ modyear = int.from_bytes(mrec1, 'big')
+ year = modyear + 1900
+ month = int.from_bytes(mrec2, 'big')
+ day = int.from_bytes(mrec3, 'big')
+ hour = int.from_bytes(mrec4, 'big')
+ minute = int.from_bytes(mrec5, 'big')
+ second = int.from_bytes(mrec6, 'big')
+
+ print('Modified date: {}-{}-{}-{}-{}-{}'.format(year, month, day, hour, minute, second))
+ break
+
+ # Advance the pointer past the data
+ dataptr += reclen
+
+ exit(0)
