一个平平无奇的解析code

# # PySTDF - The Pythonic STDF Parser # Copyright (C) 2006 Casey Marshall # # This program is free software; you can redistribute it and/or # modify it under the terms of the GNU General Public License # as published by the Free Software Foundation; either version 2 # of the License, or (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. # """ STDF Record Types ----------------- ====== ==================================== ============ Record Type PySTDF Class ====== ==================================== ============ ATR Audit Trail Record :class:`pystdf.V4.Atr` BPS Begin Program Section Record :class:`pystdf.V4.Bps` DTR Datalog Text Record :class:`pystdf.V4.Dtr` EPS End Program Section Record :class:`pystdf.V4.Eps` FAR File Attributes Record :class:`pystdf.V4.Far` FTR Functional Test Record :class:`pystdf.V4.Ftr` GDR Generic Data Record :class:`pystdf.V4.Gdr` HBR Hardware Bin Record :class:`pystdf.V4.Hbr` MIR Master Information Record :class:`pystdf.V4.Mir` MPR Multiple-Result Parametric Record :class:`pystdf.V4.Mpr` MRR Master Results Record :class:`pystdf.V4.Mrr` PCR Part Count Record :class:`pystdf.V4.Pcr` PGR Pin Group Record :class:`pystdf.V4.Pgr` PIR Part Information Record :class:`pystdf.V4.Pir` PLR Pin List Record :class:`pystdf.V4.Plr` PMR Pin Map Record :class:`pystdf.V4.Pmr` PRR Part Results Record :class:`pystdf.V4.Prr` PTR Parametric Test Record :class:`pystdf.V4.Ptr` RDR Retest Data Record :class:`pystdf.V4.Rdr` SBR Software Bin Record :class:`pystdf.V4.Sbr` SDR Site Description Record :class:`pystdf.V4.Sdr` TSR Test Synopsis Record :class:`pystdf.V4.Tsr` WCR Wafer Configuration Record :class:`pystdf.V4.Wcr` WIR Wafer Information Record :class:`pystdf.V4.Wir` WRR Wafer Results Record :class:`pystdf.V4.Wrr` ====== ==================================== ============ Data Type Codes and Representation ---------------------------------- ====== =================================================== =================== Code Description C Type Specifier ====== =================================================== =================== C*12 Fixed length character string: char[12] If a fixed length character string does not fill the entire field, it must be left-justified and padded with spaces. C*n Variable length character string: char[] first byte = unsigned count of bytes to follow (maximum of 255 bytes) C*f Variable length character string: char[] string length is stored in another field U*1 One byte unsigned integer unsigned char U*2 Two byte unsigned integer unsigned short U*4 Four byte unsigned integer unsigned long I*1 One byte signed integer char I*2 Two byte signed integer short I*4 Four byte signed integer long R*4 Four byte floating point number float R*8 Eight byte floating point number long float (double) B*6 Fixed length bit-encoded data char[6] V*n Variable data type field: The data type is specified by a code in the first byte, and the data follows (maximum of 255 bytes) B*n Variable length bit-encoded field: char[] First byte = unsigned count of bytes to follow (maximum of 255 bytes). First data item in least significant bit of the second byte of the array (first byte is count.) D*n Variable length bit-encoded field: char[] First two bytes = unsigned count of bits to follow (maximum of 65,535 bits). First data item in least significant bit of the third byte of the array (first two bytes are count). Unused bits at the high order end of the last byte must be zero. N*1 Unsigned integer data stored in a nibble. char First item in low 4 bits, second item in high 4 bits. If an odd number of nibbles is indicated, the high nibble of the byte will be zero. Only whole bytes can be written to the STDF file. kxTYPE Array of data of the type specified. TYPE[] The value of *k* (the number of elements in the array) is defined in an earlier field in the record. For example, an array of short unsigned integers is defined as kxU*2. ====== =================================================== =================== """ import sys from pystdf.Types import StdfRecordMeta, RecordType, stdfToLogicalType from pystdf import TableTemplate import pdb class Far(RecordType, metaclass=StdfRecordMeta): """ **File Attributes Record (FAR)** Function: Contains the information necessary to determine how to decode the STDF data contained in the file. Data Fields: ======== ==== ========================================= ==================== Name Type Description Missing/Invalid Flag ======== ==== ========================================= ==================== REC_LEN U*2 Bytes of data following header REC_TYP U*1 Record type(0) REC_SUB U*1 Record sub-type (10) CPU_TYPE U*1 CPU type that wrote this file STDF_VER U*1 STDF version number ======== ==== ========================================= ==================== Notes on Specific Fields: CPU_TYPE: Indicates which type of CPU wrote this STDF file. This information is useful for determining the CPU-dependent data representation of the integer and floating point fields in the file's records. The valid values are: - 0: DEC PDP-11 and VAX processors. F and D floating point formats will be used. G and H floating point formats will not be used. - 1: Sun1,2,3, and 4computers. - 2: Sun 386i computers, and IBM PC, IBM PC-AT, and IBM PC-XT computers. - 3-127: Reserved for future use by Teradyne. - 128-255: Reserved for use by customers. A code defined here may also be valid for other CPU types whose data formats are fully compatible with that of the type listed here. Before using one of these codes for a CPU type not listed here, please check with the Teradyne hotline, which can provide additional information on CPU compatibility. STDF_VER: Identifies the version number of the STDF specification used in generating the data. This allows data analysis programs to handle STDF specification enhancements. Location: Required as the first record of the file. """ typ = 0 sub = 10 fieldMap = ( ('CPU_TYPE', 'U1'), ('STDF_VER', 'U1') ) class Atr(RecordType, met