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mdfinfo3.py
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mdfinfo3.py
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# -*- coding: utf-8 -*-
""" Measured Data Format blocks parser for version 3.x
Created on Thu Dec 9 12:57:28 2014
Platform and python version
----------------------------------------
With Unix and Windows for python 2.6+ and 3.2+
:Author: `Aymeric Rateau <http://code.google.com/p/mdfreader/>`__
Dependencies
-------------------
- Python >2.6, >3.2 <http://www.python.org>
- Numpy >1.6 <http://numpy.scipy.org>
Attributes
--------------
PythonVersion : float
Python version currently running, needed for compatibility of both python 2.6+ and 3.2+
mdfinfo3 module
--------------------------
"""
from sys import version_info
PythonVersion = version_info
PythonVersion = PythonVersion[0]
from numpy import sort, zeros
from struct import calcsize, unpack
class info3(dict):
""" mdf file info class version 3.x
MDFINFO is a class information about an MDF (Measure Data Format) file
Based on following specification http://powertrainnvh.com/nvh/MDFspecificationv03.pdf
Attributes
--------------
filterChannelNames : bool, optional
flag to filter long channel names including module names separated by a '.'
fileName : str
name of file
Notes
--------
mdfinfo(FILENAME) contains a dict of structures, for
each data group, containing key information about all channels in each
group. FILENAME is a string that specifies the name of the MDF file.
General dictionary structure is the following
- mdfinfo['HDBlock'] header block
- mdfinfo['DGBlock'][dataGroup] Data Group block
- mdfinfo['CGBlock'][dataGroup][channelGroup] Channel Group block
- mdfinfo['CNBlock'][dataGroup][channelGroup][channel] Channel block including text blocks for comment and identifier
- mdfinfo['CCBlock'][dataGroup][channelGroup][channel] Channel conversion information
"""
def __init__(self, fileName=None, fid=None, filterChannelNames=False):
""" info3 class constructor
Parameters
----------------
fileName : str, optional
name of file
fid : float, optional
file identifier
filterChannelNames : bool, optional
flag to filter long channel names including module names separated by a '.'
Notes
--------
If fileName is given it will read file blocks directly by calling method readinfo3
"""
self['IDBlock'] = {} # Identifier Block
self['HDBlock'] = {} # Header Block
self['DGBlock'] = {} # Data Group Block
self['CGBlock'] = {} # Channel Group Block
self['CNBlock'] = {} # Channel Block
self['CCBlock'] = {} # Conversion block
self.filterChannelNames = filterChannelNames
self.fileName = fileName
if fileName is not None and fid is None:
try:
fid = open(self.fileName, 'rb')
except IOError:
raise IOError('Can not find file ' + self.fileName)
self.readinfo3(fid)
elif fileName is None and fid is not None:
self.readinfo3(fid)
def readinfo3(self, fid):
""" read all file blocks except data
Parameters
----------------
fid : float
file identifier
"""
# reads IDBlock
fid.seek(24)
self['IDBlock']['ByteOrder'] = unpack('<H', fid.read(2))
self['IDBlock']['FloatingPointFormat'] = unpack('<H', fid.read(2))
self['IDBlock']['id_ver'] = unpack('<H', fid.read(2))
self['IDBlock']['id_ver'] = self['IDBlock']['id_ver'][0]
self['IDBlock']['CodePageNumber'] = unpack('<H', fid.read(2))
self['IDBlock']['CodePageNumber'] = self['IDBlock']['CodePageNumber'][0]
# Read header block (HDBlock) information
# Read Header block info into structure, HD pointer at 64 as mentioned in specification
self['HDBlock'] = self.mdfblockread3(self.blockformats3('HDFormat', self['IDBlock']['id_ver']), fid, 64)
# Read text block (TXBlock) information
self['HDBlock']['TXBlock'] = self.mdfblockread3(self.blockformats3('TXFormat'), fid, self['HDBlock']['pointerToTXBlock'])
# Read text block (PRBlock) information
self['HDBlock']['PRBlock'] = self.mdfblockread3(self.blockformats3('PRFormat'), fid, self['HDBlock']['pointerToPRBlock'])
# Read Data Group blocks (DGBlock) information
# Get pointer to first Data Group block
DGpointer = self['HDBlock']['pointerToFirstDGBlock']
for dataGroup in range(self['HDBlock']['numberOfDataGroups']):
# Read data Data Group block info into structure
self['DGBlock'][dataGroup] = self.mdfblockread3(self.blockformats3('DGFormat'), fid, DGpointer)
# Get pointer to next Data Group block
DGpointer = self['DGBlock'][dataGroup]['pointerToNextDGBlock']
# Read Channel Group block (CGBlock) information - offset set already
# Read data Channel Group block info into structure
CGpointer = self['DGBlock'][dataGroup]['pointerToNextCGBlock']
self['CGBlock'][dataGroup] = {}
self['CNBlock'][dataGroup] = {}
self['CCBlock'][dataGroup] = {}
for channelGroup in range(self['DGBlock'][dataGroup]['numberOfChannelGroups']):
self['CNBlock'][dataGroup][channelGroup] = {}
self['CCBlock'][dataGroup][channelGroup] = {}
self['CGBlock'][dataGroup][channelGroup] = self.mdfblockread3(self.blockformats3('CGFormat'), fid, CGpointer)
CGpointer = self['CGBlock'][dataGroup][channelGroup]['pointerToNextCGBlock']
CGTXpointer = self['CGBlock'][dataGroup][channelGroup]['pointerToChannelGroupCommentText']
# Read data Text block info into structure
self['CGBlock'][dataGroup][channelGroup]['TXBlock'] = self.mdfblockread3(self.blockformats3('TXFormat'), fid, CGTXpointer)
# Get pointer to next first Channel block
CNpointer = self['CGBlock'][dataGroup][channelGroup]['pointerToFirstCNBlock']
# For each Channel
for channel in range(self['CGBlock'][dataGroup][channelGroup]['numberOfChannels']):
# Read Channel block (CNBlock) information
#self.numberOfChannels += 1
# Read data Channel block info into structure
self['CNBlock'][dataGroup][channelGroup][channel] = self.mdfblockread3(self.blockformats3('CNFormat'), fid, CNpointer)
CNpointer = self['CNBlock'][dataGroup][channelGroup][channel]['pointerToNextCNBlock']
# Read Channel text blocks (TXBlock)
# Clean signal name
shortSignalName = self['CNBlock'][dataGroup][channelGroup][channel]['signalName'] # short name of signal
CNTXpointer = self['CNBlock'][dataGroup][channelGroup][channel]['pointerToASAMNameBlock']
if CNTXpointer > 0:
longSignalName = self.mdfblockread3(self.blockformats3('TXFormat'), fid, CNTXpointer) # long name of signal
longSignalName = longSignalName['Text']
if len(longSignalName) > len(shortSignalName): # long name should be used
signalname = longSignalName
else:
signalname = shortSignalName
else:
signalname = shortSignalName
signalname = signalname.split('\\')
if len(signalname) > 1:
self['CNBlock'][dataGroup][channelGroup][channel]['deviceName'] = signalname[1]
signalname = signalname[0]
if self.filterChannelNames:
signalname = signalname.split('.')[-1] # filters channels modules
self['CNBlock'][dataGroup][channelGroup][channel]['signalName'] = signalname
#self.channelNameList.append( signalname )
# Read channel description
CNTXpointer = self['CNBlock'][dataGroup][channelGroup][channel]['pointerToChannelCommentBlock']
self['CNBlock'][dataGroup][channelGroup][channel]['ChannelCommentBlock'] = self.mdfblockread3(self.blockformats3('TXFormat'), fid, CNTXpointer)
CNTXpointer = self['CNBlock'][dataGroup][channelGroup][channel]['pointerToSignalIdentifierBlock']
# Read data Text block info into structure
self['CNBlock'][dataGroup][channelGroup][channel]['SignalIdentifierBlock'] = self.mdfblockread3(self.blockformats3('TXFormat'), fid, CNTXpointer)
# Read Channel Conversion block (CCBlock)
# Get pointer to Channel conversion block
CCpointer = self['CNBlock'][dataGroup][channelGroup][channel]['pointerToConversionFormula']
if CCpointer == 0: # If no conversion formula, set to 1:1
self['CCBlock'][dataGroup][channelGroup][channel] = {}
self['CCBlock'][dataGroup][channelGroup][channel]['conversionFormulaIdentifier'] = 65535
else: # Otherwise get conversion formula, parameters and physical units
# Read data Channel Conversion block info into structure
self['CCBlock'][dataGroup][channelGroup][channel] = self.mdfblockread3(self.blockformats3('CCFormat'), fid, CCpointer)
# Extract Channel Conversion formula based on conversion
# type(conversionFormulaIdentifier)
# Get current file position
currentPosition = fid.tell()
if self['CCBlock'][dataGroup][channelGroup][channel]['conversionFormulaIdentifier'] == 0: # Parameteric, Linear: Physical =Integer*P2 + P1
# Read data Channel Conversion parameters info into structure
self['CCBlock'][dataGroup][channelGroup][channel]['conversion'] = self.mdfblockread3(self.blockformats3('CCFormatFormula0'), fid, currentPosition)
elif self['CCBlock'][dataGroup][channelGroup][channel]['conversionFormulaIdentifier'] == 1: # Table look up with interpolation
# Get number of parameters sets
num = self['CCBlock'][dataGroup][channelGroup][channel]['numberOfValuePairs']
self['CCBlock'][dataGroup][channelGroup][channel]['conversion'] = {}
for pair in range(num):
# Read data Channel Conversion parameters info into structure
self['CCBlock'][dataGroup][channelGroup][channel]['conversion'][pair] = self.mdfblockread3(self.blockformats3('CCFormatFormula1'), fid, currentPosition)
# Get current file position
currentPosition = fid.tell()
elif self['CCBlock'][dataGroup][channelGroup][channel]['conversionFormulaIdentifier'] == 2: # table look up
# Get number of parameters sets
num = self['CCBlock'][dataGroup][channelGroup][channel]['numberOfValuePairs']
self['CCBlock'][dataGroup][channelGroup][channel]['conversion'] = {}
for pair in range(num):
# Read data Channel Conversion parameters info into structure
self['CCBlock'][dataGroup][channelGroup][channel]['conversion'][pair] = self.mdfblockread3(self.blockformats3('CCFormatFormula2'), fid, currentPosition)
# Get current file position
currentPosition = fid.tell()
elif self['CCBlock'][dataGroup][channelGroup][channel]['conversionFormulaIdentifier'] == 6: # Polynomial
# Read data Channel Conversion parameters info into structure
self['CCBlock'][dataGroup][channelGroup][channel]['conversion'] = self.mdfblockread3(self.blockformats3('CCFormatFormula6'), fid, currentPosition)
elif self['CCBlock'][dataGroup][channelGroup][channel]['conversionFormulaIdentifier'] == 7: # Exponential
# Read data Channel Conversion parameters info into structure
self['CCBlock'][dataGroup][channelGroup][channel]['conversion'] = self.mdfblockread3(self.blockformats3('CCFormatFormula7'), fid, currentPosition)
elif self['CCBlock'][dataGroup][channelGroup][channel]['conversionFormulaIdentifier'] == 8: # Logarithmic
# Read data Channel Conversion parameters info into structure
self['CCBlock'][dataGroup][channelGroup][channel]['conversion'] = self.mdfblockread3(self.blockformats3('CCFormatFormula8'), fid, currentPosition)
elif self['CCBlock'][dataGroup][channelGroup][channel]['conversionFormulaIdentifier'] == 9: # Rational
# Read data Channel Conversion parameters info into structure
self['CCBlock'][dataGroup][channelGroup][channel]['conversion'] = self.mdfblockread3(self.blockformats3('CCFormatFormula9'), fid, currentPosition)
elif self['CCBlock'][dataGroup][channelGroup][channel]['conversionFormulaIdentifier'] == 10: # Text Formula
# Read data Channel Conversion parameters info into structure
self['CCBlock'][dataGroup][channelGroup][channel]['conversion'] = self.mdfblockread3(self.blockformats3('CCFormatFormula10'), fid, currentPosition, removeTrailing0=False)
elif self['CCBlock'][dataGroup][channelGroup][channel]['conversionFormulaIdentifier'] == 11: # Text table
# Get number of parameters sets
num = self['CCBlock'][dataGroup][channelGroup][channel]['numberOfValuePairs']
self['CCBlock'][dataGroup][channelGroup][channel]['conversion'] = {}
for pair in range(num):
# Read data Channel Conversion parameters info into structure
self['CCBlock'][dataGroup][channelGroup][channel]['conversion'][pair] = self.mdfblockread3(self.blockformats3('CCFormatFormula11'), fid, currentPosition)
# Get current file position
currentPosition = fid.tell()
elif self['CCBlock'][dataGroup][channelGroup][channel]['conversionFormulaIdentifier'] == 12: # Text range table
# Get number of parameters sets
num = self['CCBlock'][dataGroup][channelGroup][channel]['numberOfValuePairs']
self['CCBlock'][dataGroup][channelGroup][channel]['conversion'] = {}
for pair in range(num): # first pair is default
# Read data Channel Conversion parameters info into structure
self['CCBlock'][dataGroup][channelGroup][channel]['conversion'][pair] = self.mdfblockread3(self.blockformats3('CCFormatFormula12'), fid, currentPosition)
# Get current file position
currentPosition = fid.tell()
for pair in range(num): # get text range
# Read corresponding text
temp = self.mdfblockread3(self.blockformats3('TXFormat'), fid, self['CCBlock'][dataGroup][channelGroup][channel]['conversion'][pair]['pointerToTXBlock'])
try:
self['CCBlock'][dataGroup][channelGroup][channel]['conversion'][pair]['Textrange'] = temp['Text']
except:
self['CCBlock'][dataGroup][channelGroup][channel]['conversion'][pair]['Textrange'] = ""
elif self['CCBlock'][dataGroup][channelGroup][channel]['conversionFormulaIdentifier'] == 65535: # No conversion int=phys
pass
else:
# Give warning that conversion formula is not being
# made
print(('Conversion Formula type (conversionFormulaIdentifier=' + str(self['CCBlock'][dataGroup][channelGroup][channel]['conversionFormulaIdentifier']) + ')not supported.'))
# CLose the file
fid.close()
# reorder channel blocks and related blocks based on first bit position
# this reorder is meant to improve performance while parsing records using core.records.fromfile
# as it will not use cn_byte_offset
# first, calculate new mapping/order
for dg in range(self['HDBlock']['numberOfDataGroups']):
for cg in range(self['DGBlock'][dataGroup]['numberOfChannelGroups']):
nChannel = len(self['CNBlock'][dg][cg])
Map = zeros(shape=len(self['CNBlock'][dg][cg]), dtype=[('index', 'u4'), ('first_bit', 'u4')])
for cn in range(nChannel):
Map[cn] = (cn, self['CNBlock'][dg][cg][cn]['numberOfTheFirstBits'])
orderedMap = sort(Map, order='first_bit')
toChangeIndex = Map == orderedMap
for cn in range(nChannel):
if not toChangeIndex[cn]:
# offset all indexes of indexes to be moved
self['CNBlock'][dg][cg][cn + nChannel] = self['CNBlock'][dg][cg].pop(cn)
self['CCBlock'][dg][cg][cn + nChannel] = self['CCBlock'][dg][cg].pop(cn)
for cn in range(nChannel):
if not toChangeIndex[cn]:
# change to ordered index
self['CNBlock'][dg][cg][cn] = self['CNBlock'][dg][cg].pop(orderedMap[cn][0] + nChannel)
self['CCBlock'][dg][cg][cn] = self['CCBlock'][dg][cg].pop(orderedMap[cn][0] + nChannel)
def listChannels3(self, fileName=None):
""" reads data, channel group and channel blocks to list channel names
Attributes
--------------
fileName : str
file name
Returns
-----------
list of channel names
"""
# Read MDF file and extract its complete structure
if fileName is not None:
self.fileName = fileName
# Open file
fid = open(self.fileName, 'rb')
channelNameList = []
# Read header block (HDBlock) information
# Set file pointer to start of HDBlock
HDpointer = 64
# Read Header block info into structure
self['HDBlock'] = self.mdfblockread3(self.blockformats3('HDFormat'), fid, HDpointer)
# Read Data Group blocks (DGBlock) information
# Get pointer to first Data Group block
DGpointer = self['HDBlock']['pointerToFirstDGBlock']
for dataGroup in range(self['HDBlock']['numberOfDataGroups']):
# Read data Data Group block info into structure
self['DGBlock'][dataGroup] = self.mdfblockread3(self.blockformats3('DGFormat'), fid, DGpointer)
# Get pointer to next Data Group block
DGpointer = self['DGBlock'][dataGroup]['pointerToNextDGBlock']
# Read Channel Group block (CGBlock) information - offset set already
# Read data Channel Group block info into structure
CGpointer = self['DGBlock'][dataGroup]['pointerToNextCGBlock']
self['CGBlock'][dataGroup] = {}
self['CNBlock'][dataGroup] = {}
self['CCBlock'][dataGroup] = {}
for channelGroup in range(self['DGBlock'][dataGroup]['numberOfChannelGroups']):
self['CNBlock'][dataGroup][channelGroup] = {}
self['CCBlock'][dataGroup][channelGroup] = {}
self['CGBlock'][dataGroup][channelGroup] = self.mdfblockread3(self.blockformats3('CGFormat'), fid, CGpointer)
CGpointer = self['CGBlock'][dataGroup][channelGroup]['pointerToNextCGBlock']
# Get pointer to next first Channel block
CNpointer = self['CGBlock'][dataGroup][channelGroup]['pointerToFirstCNBlock']
# For each Channel
for channel in range(self['CGBlock'][dataGroup][channelGroup]['numberOfChannels']):
# Read Channel block (CNBlock) information
#self.numberOfChannels += 1
# Read data Channel block info into structure
self['CNBlock'][dataGroup][channelGroup][channel] = self.mdfblockread3(self.blockformats3('CNFormat'), fid, CNpointer)
CNpointer = self['CNBlock'][dataGroup][channelGroup][channel]['pointerToNextCNBlock']
# Read Channel text blocks (TXBlock)
# Clean signal name
shortSignalName = self['CNBlock'][dataGroup][channelGroup][channel]['signalName'] # short name of signal
CNTXpointer = self['CNBlock'][dataGroup][channelGroup][channel]['pointerToASAMNameBlock']
if CNTXpointer > 0:
longSignalName = self.mdfblockread3(self.blockformats3('TXFormat'), fid, CNTXpointer) # long name of signal
longSignalName = longSignalName['Text']
if len(longSignalName) > len(shortSignalName): # long name should be used
signalname = longSignalName
else:
signalname = shortSignalName
else:
signalname = shortSignalName
signalname = signalname.split('\\')
signalname = signalname[0]
if self.filterChannelNames:
signalname = signalname.split('.')[-1]
self['CNBlock'][dataGroup][channelGroup][channel]['signalName'] = signalname
channelNameList.append(signalname)
# CLose the file
fid.close()
return channelNameList
#######blockformats3####################
@staticmethod
def blockformats3(block, version=0):
""" This function returns all the predefined formats for the different blocks in the MDF file
Parameters
----------------
block : str
kind of block
version : int
mdf version
Returns
-----------
nested list of str and int describing structure of block to be used by mdfblockread3 method
"""
# Data Type Definitions '<' for little-endian byteOrder
LINK = '<I'
CHAR = '<c'
REAL = '<d'
BOOL = '<h'
#UINT8 = '<B'
#BYTE = '<B'
INT16 = '<h'
UINT16 = '<H'
UINT32 = '<I'
#INT32 = '<i'
UINT64 = '<Q'
#INT64 = '<q'
formats = ()
if block == 'TXFormat':
formats = (
(CHAR, 2, 'BlockType'),
(UINT16, 1, 'BlockSize'),
(CHAR, 'Var', 'Text'))
elif block == 'CNFormat':
formats = (
(CHAR, 2, 'BlockType'),
(UINT16, 1, 'BlockSize'),
(LINK, 1, 'pointerToNextCNBlock'),
(LINK, 1, 'pointerToConversionFormula'),
(LINK, 1, 'pointerToCEBlock'),
(LINK, 1, 'pointerToCDBlock'),
(LINK, 1, 'pointerToChannelCommentBlock'),
(UINT16, 1, 'channelType'),
(CHAR, 32, 'signalName'),
(CHAR, 128, 'signalDescription'),
(UINT16, 1, 'numberOfTheFirstBits'),
(UINT16, 1, 'numberOfBits'),
(UINT16, 1, 'signalDataType'),
(BOOL, 1, 'valueRangeKnown'),
(REAL, 1, 'valueRangeMinimum'),
(REAL, 1, 'valueRangeMaximum'),
(REAL, 1, 'rateVariableSampled'),
(LINK, 1, 'pointerToASAMNameBlock'),
(LINK, 1, 'pointerToSignalIdentifierBlock'),
(UINT16, 1, 'ByteOffset'))
elif block == 'CCFormat':
formats = (
(CHAR, 2, 'BlockType'),
(UINT16, 1, 'BlockSize'),
(BOOL, 1, 'valueRangeKnown'),
(REAL, 1, 'valueRangeMinimum'),
(REAL, 1, 'valueRangeMaximum'),
(CHAR, 20, 'physicalUnit'),
(UINT16, 1, 'conversionFormulaIdentifier'),
(UINT16, 1, 'numberOfValuePairs'))
elif block == 'CCFormatFormula0':
formats = ( # parametric, linear
(REAL, 1, 'P1'),
(REAL, 1, 'P2'))
elif block in ('CCFormatFormula1', 'CCFormatFormula2'):
formats = ( # Tablular or Tabular with interp
(REAL, 1, 'int'),
(REAL, 1, 'phys'))
elif block == 'CCFormatFormula10':
formats = ( # Text formula
(CHAR, 256, 'textFormula'),)
elif block == 'CCFormatFormula11':
formats = ( # ASAM-MCD2 text table
(REAL, 1, 'int'),
(CHAR, 32, 'text'))
elif block in ('CCFormatFormula6', 'CCFormatFormula9'):
formats = ( # polynomial
(REAL, 1, 'P1'),
(REAL, 1, 'P2'),
(REAL, 1, 'P3'),
(REAL, 1, 'P4'),
(REAL, 1, 'P5'),
(REAL, 1, 'P6'))
elif block in ('CCFormatFormula7', 'CCFormatFormula8'):
formats = ( # Exponential and logarithmic
(REAL, 1, 'P1'),
(REAL, 1, 'P2'),
(REAL, 1, 'P3'),
(REAL, 1, 'P4'),
(REAL, 1, 'P5'),
(REAL, 1, 'P6'),
(REAL, 1, 'P7'))
elif block == 'CCFormatFormula12':
formats = ( # ASAM-MCD2 text range table
(REAL, 1, 'lowerRange'),
(REAL, 1, 'upperRange'),
(LINK, 1, 'pointerToTXBlock'))
elif block == 'PRFormat':
formats = (
(CHAR, 2, 'BlockType'),
(UINT16, 1, 'BlockSize'),
(CHAR, 'Var', 'PRData'))
elif block == 'CGFormat':
formats = (
(CHAR, 2, 'BlockType'),
(UINT16, 1, 'BlockSize'),
(LINK, 1, 'pointerToNextCGBlock'),
(LINK, 1, 'pointerToFirstCNBlock'),
(LINK, 1, 'pointerToChannelGroupCommentText'),
(UINT16, 1, 'recordID'),
(UINT16, 1, 'numberOfChannels'),
(UINT16, 1, 'dataRecordSize'),
(UINT32, 1, 'numberOfRecords'))
# last one missing
elif block == 'DGFormat':
formats = (
(CHAR, 2, 'BlockType'),
(UINT16, 1, 'BlockSize'), # All DGBlocks Size
(LINK, 1, 'pointerToNextDGBlock'),
(LINK, 1, 'pointerToNextCGBlock'),
(LINK, 1, 'reserved'),
(LINK, 1, 'pointerToDataRecords'),
(UINT16, 1, 'numberOfChannelGroups'),
(UINT16, 1, 'numberOfRecordIDs'))
elif block == 'HDFormat':
if version < 3.2:
formats = (
(CHAR, 2, 'BlockType'),
(UINT16, 1, 'BlockSize'),
(LINK, 1, 'pointerToFirstDGBlock'),
(LINK, 1, 'pointerToTXBlock'),
(LINK, 1, 'pointerToPRBlock'),
(UINT16, 1, 'numberOfDataGroups'),
(CHAR, 10, 'Date'),
(CHAR, 8, 'Time'),
(CHAR, 32, 'Author'),
(CHAR, 32, 'Organization'),
(CHAR, 32, 'ProjectName'),
(CHAR, 32, 'Subject'))
else:
formats = (
(CHAR, 2, 'BlockType'),
(UINT16, 1, 'BlockSize'),
(LINK, 1, 'pointerToFirstDGBlock'),
(LINK, 1, 'pointerToTXBlock'),
(LINK, 1, 'pointerToPRBlock'),
(UINT16, 1, 'numberOfDataGroups'),
(CHAR, 10, 'Date'),
(CHAR, 8, 'Time'),
(CHAR, 32, 'Author'),
(CHAR, 32, 'Organization'),
(CHAR, 32, 'ProjectName'),
(CHAR, 32, 'Subject'),
(UINT64, 1, 'TimeStamp'),
(INT16, 1, 'UTCTimeOffset'),
(UINT16, 1, 'TimeQualityClass'),
(CHAR, 32, 'TimeIdentification'))
elif block == 'IDFormat':
formats = (
(CHAR, 8, 'FileID'),
(CHAR, 8, 'FormatID'),
(CHAR, 8, 'ProgramID'),
(UINT16, 1, 'ByteOrder'),
(UINT16, 1, 'FloatingPointFormat'),
(UINT16, 1, 'VersionNumber'),
(UINT16, 1, 'CodePageNumber'))
else:
print('Block format name error ')
return formats
#######mdfblockread3####################
@staticmethod
def mdfblockread3(blockFormat, fid, pointer, removeTrailing0=True):
""" Extract block of data from MDF file in original data types.
Returns a dictionary with keys specified in data structure blockFormat
Parameters
----------------
blockFormat : nested list
output of blockformats3 method
fid : float
file identifier
pointer : int
position of block in file
removeTrailing0 : bool, optional
removes or not the trailing 0 from strings
Returns
-----------
Block content in a dict
"""
Block = {}
if pointer != 0 and pointer is not None:
fid.seek(pointer)
# Extract parameters
for field in range(len(blockFormat)):
fieldTuple = blockFormat[field]
fieldFormat = fieldTuple[0]
fieldNumber = fieldTuple[1]
fieldName = fieldTuple[2]
if fieldFormat == '<c': # Char
if fieldNumber != 'Var':
value = fid.read(fieldNumber)
elif Block['BlockSize'] and Block['BlockSize'] - 4 > 0:
value = fid.read(Block['BlockSize'] - 4)
elif not Block['BlockSize']:
value = ''
if PythonVersion < 3:
if removeTrailing0:
Block[fieldName] = value.replace('\x00', '')
else:
Block[fieldName] = value
else:
if removeTrailing0:
Block[fieldName] = value.decode('latin1', 'replace').replace('\x00', '') # decode bytes
else:
Block[fieldName] = value.decode('latin1', 'replace')
else: # numeric
formatSize = calcsize(fieldFormat)
number = fid.read(formatSize * fieldNumber)
if number:
value = unpack(fieldFormat, number)
Block[fieldName] = value[0]
else:
Block[fieldName] = None
return Block