code: # BSD 3-Clause License; see https://github.com/scikit-hep/uproot4/blob/main/LICENSE
  
  """
  This module defines integer constants used by serialization and deserialization routines.
  """
  
  from __future__ import absolute_import
  
  import numpy
  
  # used in unmarshaling
  kByteCountMask = numpy.int64(0x40000000)
  kByteCountVMask = numpy.int64(0x4000)
  kClassMask = numpy.int64(0x80000000)
  kNewClassTag = numpy.int64(0xFFFFFFFF)
  
  kIsOnHeap = numpy.uint32(0x01000000)
  kIsReferenced = numpy.uint32(1 << 4)
  
  kMapOffset = 2
  
  # not used?
  kNullTag = 0
  kNotDeleted = numpy.uint32(0x02000000)
  kZombie = numpy.uint32(0x04000000)
  kBitMask = numpy.uint32(0x00FFFFFF)
  kDisplacementMask = numpy.uint32(0xFF000000)
  
  ############# core/zip/inc/Compression.h
  
  kZLIB = 1
  kLZMA = 2
  kOldCompressionAlgo = 3
  kLZ4 = 4
  kZSTD = 5
  kUndefinedCompressionAlgorithm = 6
  
  ############# constants for streamers
  
  kBase = 0
  kChar = 1
  kShort = 2
  kInt = 3
  kLong = 4
  kFloat = 5
  kCounter = 6
  kCharStar = 7
  kDouble = 8
  kDouble32 = 9
  kLegacyChar = 10
  kUChar = 11
  kUShort = 12
  kUInt = 13
  kULong = 14
  kBits = 15
  kLong64 = 16
  kULong64 = 17
  kBool = 18
  kFloat16 = 19
  kOffsetL = 20
  kOffsetP = 40
  kObject = 61
  kAny = 62
  kObjectp = 63
  kObjectP = 64
  kTString = 65
  kTObject = 66
  kTNamed = 67
  kAnyp = 68
  kAnyP = 69
  kAnyPnoVT = 70
  kSTLp = 71
  
  kSkip = 100
  kSkipL = 120
  kSkipP = 140
  
  kConv = 200
  kConvL = 220
  kConvP = 240
  
  kSTL = 300
  kSTLstring = 365
  
  kStreamer = 500
  kStreamLoop = 501
  
  ############# constants from core/foundation/inc/ESTLType.h
  
  kNotSTL = 0
  kSTLvector = 1
  kSTLlist = 2
  kSTLdeque = 3
  kSTLmap = 4
  kSTLmultimap = 5
  kSTLset = 6
  kSTLmultiset = 7
  kSTLbitset = 8
  kSTLforwardlist = 9
  kSTLunorderedset = 10
  kSTLunorderedmultiset = 11
  kSTLunorderedmap = 12
  kSTLunorderedmultimap = 13
  kSTLend = 14
  kSTLany = 300
  
  ############# IOFeatures
  
  kGenerateOffsetMap = numpy.uint8(1)
  
  ############# other
  
  kStreamedMemberWise = numpy.uint16(1 << 14)
  
apis: numpy.uint8 numpy.uint16 numpy.uint32 numpy.int64