| Tim Edwards | fa1b3ad | 2021-07-12 16:08:02 -0400 | [diff] [blame] | 1 | #!/usr/bin/env python3 |
| 2 | # Script to read a GDS file and print out the timestamp(s). |
| 3 | |
| 4 | import os |
| 5 | import sys |
| 6 | import datetime |
| 7 | |
| 8 | def usage(): |
| 9 | print('get_gds_date.py <path_to_gds_in> [-created | -modified]') |
| 10 | |
| 11 | if __name__ == '__main__': |
| 12 | debug = False |
| 13 | |
| 14 | if len(sys.argv) == 1: |
| 15 | print("No options given to change_gds_date.py.") |
| 16 | usage() |
| 17 | sys.exit(0) |
| 18 | |
| 19 | optionlist = [] |
| 20 | arguments = [] |
| 21 | |
| 22 | for option in sys.argv[1:]: |
| 23 | if option.find('-', 0) == 0: |
| 24 | optionlist.append(option) |
| 25 | else: |
| 26 | arguments.append(option) |
| 27 | |
| 28 | if len(arguments) != 1: |
| 29 | print("Wrong number of arguments given to get_gds_date.py.") |
| 30 | usage() |
| 31 | sys.exit(0) |
| 32 | |
| 33 | created = True |
| 34 | modified = True |
| 35 | |
| 36 | if '-debug' in optionlist: |
| 37 | debug = True |
| 38 | if '-created' in optionlist: |
| 39 | modified = False |
| 40 | if '-modified' in optionlist: |
| 41 | created = False |
| 42 | |
| 43 | source = arguments[0] |
| 44 | |
| 45 | sourcedir = os.path.split(source)[0] |
| 46 | gdsinfile = os.path.split(source)[1] |
| 47 | |
| 48 | with open(source, 'rb') as ifile: |
| 49 | gdsdata = ifile.read() |
| 50 | |
| 51 | datalen = len(gdsdata) |
| 52 | dataptr = 0 |
| 53 | while dataptr < datalen: |
| 54 | # Read stream records up to any string, then search for search text. |
| 55 | bheader = gdsdata[dataptr:dataptr + 2] |
| 56 | reclen = int.from_bytes(bheader, 'big') |
| 57 | if reclen == 0: |
| 58 | print('Error: found zero-length record at position ' + str(dataptr)) |
| 59 | break |
| 60 | |
| 61 | rectype = gdsdata[dataptr + 2] |
| 62 | datatype = gdsdata[dataptr + 3] |
| 63 | |
| 64 | brectype = rectype.to_bytes(1, byteorder='big') |
| 65 | bdatatype = datatype.to_bytes(1, byteorder='big') |
| 66 | |
| 67 | if rectype == 1: # 1 = beginlib |
| 68 | # Datatype should be 2 |
| 69 | if datatype != 2: |
| 70 | print('Error: Header data type is not 2-byte integer!') |
| 71 | if reclen != 28: |
| 72 | print('Error: Header record length is not 28!') |
| 73 | if debug: |
| 74 | print('Record type = ' + str(rectype) + ' data type = ' + str(datatype) + ' length = ' + str(reclen)) |
| 75 | |
| 76 | if created: |
| 77 | crec1 = gdsdata[dataptr + 4:dataptr + 6] |
| 78 | crec2 = gdsdata[dataptr + 6:dataptr + 8] |
| 79 | crec3 = gdsdata[dataptr + 8:dataptr + 10] |
| 80 | crec4 = gdsdata[dataptr + 10:dataptr + 12] |
| 81 | crec5 = gdsdata[dataptr + 12:dataptr + 14] |
| 82 | crec6 = gdsdata[dataptr + 14:dataptr + 16] |
| 83 | |
| 84 | modyear = int.from_bytes(crec1, 'big') |
| 85 | year = modyear + 1900 |
| 86 | month = int.from_bytes(crec2, 'big') |
| 87 | day = int.from_bytes(crec3, 'big') |
| 88 | hour = int.from_bytes(crec4, 'big') |
| 89 | minute = int.from_bytes(crec5, 'big') |
| 90 | second = int.from_bytes(crec6, 'big') |
| 91 | |
| 92 | print('Created date: {}-{}-{}-{}-{}-{}'.format(year, month, day, hour, minute, second)) |
| 93 | |
| 94 | if modified: |
| 95 | mrec1 = gdsdata[dataptr + 16:dataptr + 18] |
| 96 | mrec2 = gdsdata[dataptr + 18:dataptr + 20] |
| 97 | mrec3 = gdsdata[dataptr + 20:dataptr + 22] |
| 98 | mrec4 = gdsdata[dataptr + 22:dataptr + 24] |
| 99 | mrec5 = gdsdata[dataptr + 24:dataptr + 26] |
| 100 | mrec6 = gdsdata[dataptr + 26:dataptr + 28] |
| 101 | |
| 102 | modyear = int.from_bytes(mrec1, 'big') |
| 103 | year = modyear + 1900 |
| 104 | month = int.from_bytes(mrec2, 'big') |
| 105 | day = int.from_bytes(mrec3, 'big') |
| 106 | hour = int.from_bytes(mrec4, 'big') |
| 107 | minute = int.from_bytes(mrec5, 'big') |
| 108 | second = int.from_bytes(mrec6, 'big') |
| 109 | |
| 110 | print('Modified date: {}-{}-{}-{}-{}-{}'.format(year, month, day, hour, minute, second)) |
| 111 | break |
| 112 | |
| 113 | # Advance the pointer past the data |
| 114 | dataptr += reclen |
| 115 | |
| 116 | exit(0) |
