def parsePrimaryVolumeDescriptor(bytesData):
# Set up elemement object to store extracted properties
properties = ET.Element("primaryVolumeDescriptor")
addProperty(properties, "typeCode", bc.bytesToUnsignedChar(bytesData[0:1]))
addProperty(properties, "standardIdentifier", bc.bytesToText(bytesData[1:6]))
addProperty(properties, "version", bc.bytesToUnsignedChar(bytesData[6:7]))
addProperty(properties, "systemIdentifier", bc.bytesToText(bytesData[8:40]))
addProperty(properties, "volumeIdentifier", bc.bytesToText(bytesData[40:72]))
# Fields below are stored as both little-endian and big-endian; only
# big-endian values read here!
# Number of Logical Blocks in which the volume is recorded
addProperty(properties, "volumeSpaceSize", bc.bytesToUInt(bytesData[84:88]))
# The size of the set in this logical volume (number of disks)
addProperty(properties, "volumeSetSize", bc.bytesToUShortInt(bytesData[122:124]))
# The number of this disk in the Volume Set
addProperty(properties, "volumeSequenceNumber", bc.bytesToUShortInt(bytesData[126:128]))
# The size in bytes of a logical block
addProperty(properties, "logicalBlockSize", bc.bytesToUShortInt(bytesData[130:132]))
# The size in bytes of the path table
addProperty(properties, "pathTableSize", bc.bytesToUInt(bytesData[136:140]))
# Location of Type-L Path Table (note this is stored as little-endian only, hence
# byte swap!)
addProperty(properties, "typeLPathTableLocation", bc.swap32(bc.bytesToUInt(bytesData[140:144])))
# Location of Optional Type-L Path Table
addProperty(properties, "optionalTypeLPathTableLocation", bc.swap32(bc.bytesToUInt(bytesData[144:148])))
# Location of Type-M Path Table
addProperty(properties, "typeMPathTableLocation", bc.bytesToUInt(bytesData[148:152]))
# Location of Optional Type-M Path Table
addProperty(properties, "optionalTypeMPathTableLocation", bc.bytesToUInt(bytesData[152:156]))
# Following fields are all text strings
addProperty(properties, "volumeSetIdentifier", bc.bytesToText(bytesData[190:318]))
addProperty(properties, "publisherIdentifier", bc.bytesToText(bytesData[318:446]))
addProperty(properties, "dataPreparerIdentifier", bc.bytesToText(bytesData[446:574]))
addProperty(properties, "applicationIdentifier", bc.bytesToText(bytesData[574:702]))
addProperty(properties, "copyrightFileIdentifier", bc.bytesToText(bytesData[702:740]))
addProperty(properties, "abstractFileIdentifier", bc.bytesToText(bytesData[740:776]))
addProperty(properties, "bibliographicFileIdentifier", bc.bytesToText(bytesData[776:813]))
# Following fields are all date-time values
addProperty(properties, "volumeCreationDateAndTime", decDateTimeToDate(bytesData[813:830]))
addProperty(properties, "volumeModificationDateAndTime", decDateTimeToDate(bytesData[830:847]))
addProperty(properties, "volumeExpirationDateAndTime", decDateTimeToDate(bytesData[847:864]))
addProperty(properties, "volumeEffectiveDateAndTime", decDateTimeToDate(bytesData[864:881]))
addProperty(properties, "fileStructureVersion", bc.bytesToUnsignedChar(bytesData[881:882]))
return(properties)
def getVolumeDescriptor(bytesData, byteStart):
# Read one 2048-byte volume descriptor and return its descriptor
# code and contents
byteEnd = byteStart + 2048
volumeDescriptorType = bc.bytesToUnsignedChar(bytesData[byteStart:byteStart+1])
volumeDescriptorData = bytesData[byteStart:byteEnd]
return(volumeDescriptorType, volumeDescriptorData, byteEnd)
def getVolumeDescriptor(bytesData, byteStart):
# Read one 2048-byte volume descriptor and return its descriptor
# code and contents
byteEnd = byteStart + 2048
volumeDescriptorType = bc.bytesToUnsignedChar(
bytesData[byteStart:byteStart + 1])
volumeDescriptorData = bytesData[byteStart:byteEnd]
return (volumeDescriptorType, volumeDescriptorData, byteEnd)
def decDateTimeToDate(datetime):
# Convert 17 bit dec-datetime field to formatted date-time string
# TODO: incorporate time zone offset into result
try:
year = int(bc.bytesToText(datetime[0:4]))
month = int(bc.bytesToText(datetime[4:6]))
day = int(bc.bytesToText(datetime[6:8]))
hour = int(bc.bytesToText(datetime[8:10]))
minute = int(bc.bytesToText(datetime[10:12]))
second = int(bc.bytesToText(datetime[12:14]))
hundrethSecond = int(bc.bytesToText(datetime[14:16]))
timeZoneOffset = bc.bytesToUnsignedChar(datetime[16:17])
dateString = "%d/%02d/%02d" % (year, month, day)
timeString = "%02d:%02d:%02d" % (hour, minute, second)
dateTimeString = "%s, %s" % (dateString, timeString)
except ValueError:
dateTimeString = ""
return (dateTimeString)
def decDateTimeToDate(datetime):
# Convert 17 bit dec-datetime field to formatted date-time string
# TODO: incorporate time zone offset into result
try:
year = int(bc.bytesToText(datetime[0:4]))
month = int(bc.bytesToText(datetime[4:6]))
day = int(bc.bytesToText(datetime[6:8]))
hour = int(bc.bytesToText(datetime[8:10]))
minute = int(bc.bytesToText(datetime[10:12]))
second = int(bc.bytesToText(datetime[12:14]))
hundrethSecond = int(bc.bytesToText(datetime[14:16]))
timeZoneOffset = bc.bytesToUnsignedChar(datetime[16:17])
dateString = "%d/%02d/%02d" % (year, month, day)
timeString = "%02d:%02d:%02d" % (hour, minute, second)
dateTimeString = "%s, %s" % (dateString, timeString)
except ValueError:
dateTimeString=""
return(dateTimeString)
def parsePrimaryVolumeDescriptor(bytesData):
# Set up elemement object to store extracted properties
properties = ET.Element("primaryVolumeDescriptor")
addProperty(properties, "typeCode", bc.bytesToUnsignedChar(bytesData[0:1]))
addProperty(properties, "standardIdentifier",
bc.bytesToText(bytesData[1:6]))
addProperty(properties, "version", bc.bytesToUnsignedChar(bytesData[6:7]))
addProperty(properties, "systemIdentifier",
bc.bytesToText(bytesData[8:40]))
addProperty(properties, "volumeIdentifier",
bc.bytesToText(bytesData[40:72]))
# Fields below are stored as both little-endian and big-endian; only
# big-endian values read here!
# Number of Logical Blocks in which the volume is recorded
addProperty(properties, "volumeSpaceSize",
bc.bytesToUInt(bytesData[84:88]))
# The size of the set in this logical volume (number of disks)
addProperty(properties, "volumeSetSize",
bc.bytesToUShortInt(bytesData[122:124]))
# The number of this disk in the Volume Set
addProperty(properties, "volumeSequenceNumber",
bc.bytesToUShortInt(bytesData[126:128]))
# The size in bytes of a logical block
addProperty(properties, "logicalBlockSize",
bc.bytesToUShortInt(bytesData[130:132]))
# The size in bytes of the path table
addProperty(properties, "pathTableSize",
bc.bytesToUInt(bytesData[136:140]))
# Location of Type-L Path Table (note this is stored as little-endian only, hence
# byte swap!)
addProperty(properties, "typeLPathTableLocation",
bc.swap32(bc.bytesToUInt(bytesData[140:144])))
# Location of Optional Type-L Path Table
addProperty(properties, "optionalTypeLPathTableLocation",
bc.swap32(bc.bytesToUInt(bytesData[144:148])))
# Location of Type-M Path Table
addProperty(properties, "typeMPathTableLocation",
bc.bytesToUInt(bytesData[148:152]))
# Location of Optional Type-M Path Table
addProperty(properties, "optionalTypeMPathTableLocation",
bc.bytesToUInt(bytesData[152:156]))
# Following fields are all text strings
addProperty(properties, "volumeSetIdentifier",
bc.bytesToText(bytesData[190:318]))
addProperty(properties, "publisherIdentifier",
bc.bytesToText(bytesData[318:446]))
addProperty(properties, "dataPreparerIdentifier",
bc.bytesToText(bytesData[446:574]))
addProperty(properties, "applicationIdentifier",
bc.bytesToText(bytesData[574:702]))
addProperty(properties, "copyrightFileIdentifier",
bc.bytesToText(bytesData[702:740]))
addProperty(properties, "abstractFileIdentifier",
bc.bytesToText(bytesData[740:776]))
addProperty(properties, "bibliographicFileIdentifier",
bc.bytesToText(bytesData[776:813]))
# Following fields are all date-time values
addProperty(properties, "volumeCreationDateAndTime",
decDateTimeToDate(bytesData[813:830]))
addProperty(properties, "volumeModificationDateAndTime",
decDateTimeToDate(bytesData[830:847]))
addProperty(properties, "volumeExpirationDateAndTime",
decDateTimeToDate(bytesData[847:864]))
addProperty(properties, "volumeEffectiveDateAndTime",
decDateTimeToDate(bytesData[864:881]))
addProperty(properties, "fileStructureVersion",
bc.bytesToUnsignedChar(bytesData[881:882]))
return (properties)
