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source: server/lib/ippvalue.py @ 8979f90

no-cups

Last change on this file since 8979f90 was 8979f90, checked in by Jessica B. Hamrick <jhamrick@…>, 14 years ago
Put various IPP classes in their own files
Property mode set to `100644`
File size: 8.6 KB

Rev	Line
[8979f90]	1	#!/usr/bin/python
	2
	3	import sys, struct, logging
	4
	5	# initialize logger
	6	logger = logging.getLogger("ippLogger")
	7
	8	class IPPValue():
	9	"""
	10	An IPP value consists of a tag and a value, and optionally, a name.
	11
	12	From RFC 2565:
	13	-----------------------------------------------
	14	\| value-tag \| 1 byte
	15	-----------------------------------------------
	16	\| name-length (value is u) \| 2 bytes
	17	-----------------------------------------------
	18	\| name \| u bytes
	19	-----------------------------------------------
	20	\| value-length (value is v) \| 2 bytes
	21	-----------------------------------------------
	22	\| value \| v bytes
	23	-----------------------------------------------
	24	"""
	25
	26	def __init__(self, value_tag, value, unpack=True):
	27	"""
	28	Initialize an IPPValue:
	29
	30	Arguments:
	31
	32	value_tag -- one byte, identifying the type of value
	33
	34	value -- variable size, containing the actual value
	35	"""
	36
	37	# make sure value_tag isn't empty
	38	assert value_tag is not None
	39	# make sure value isn't empty
	40	assert value is not None
	41
	42	self.value_tag = value_tag
	43	self.value = value
	44
	45	if not unpack: return
	46
	47	# out-of-band value tags
	48	if self.value_tag == IPPTags.UNSUPPORTED or \
	49	self.value_tag == IPPTags.DEFAULT or \
	50	self.value_tag == IPPTags.UNKNOWN or \
	51	self.value_tag == IPPTags.NO_VALUE:
	52	self.value = ''
	53
	54	# integer value tags
	55	elif self.value_tag == IPPTags.GENERIC_INTEGER:
	56	pass # not supported
	57	elif self.value_tag == IPPTags.INTEGER:
	58	self.value = struct.unpack('>i', value)[0]
	59	elif self.value_tag == IPPTags.BOOLEAN:
	60	self.value = struct.unpack('>?', value)[0]
	61	elif self.value_tag == IPPTags.ENUM:
	62	self.value = struct.unpack('>i', value)[0]
	63
	64	# octet string value tags
	65	elif self.value_tag == IPPTags.UNSPECIFIED_OCTETSTRING:
	66	pass
	67
	68	elif self.value_tag == IPPTags.DATETIME:
	69	# field octets contents range
	70	# ----- ------ -------- -----
	71	# 1 1-2 year 0..65536
	72	# 2 3 month 1..12
	73	# 3 4 day 1..31
	74	# 4 5 hour 0..23
	75	# 5 6 minutes 0..59
	76	# 6 7 seconds 0..60
	77	# (use 60 for leap-second)
	78	# 7 8 deci-seconds 0..9
	79	# 8 9 direction from UTC '+' / '-'
	80	# 9 10 hours from UTC 0..11
	81	# 10 11 minutes from UTC 0..59
	82
	83	self.value = struct.unpack('>hbbbbbbcbb', value)[0]
	84
	85	elif self.value_tag == IPPTags.RESOLUTION:
	86	# OCTET-STRING consisting of nine octets of 2
	87	# SIGNED-INTEGERs followed by a SIGNED-BYTE. The first
	88	# SIGNED-INTEGER contains the value of cross feed
	89	# direction resolution. The second SIGNED-INTEGER contains
	90	# the value of feed direction resolution. The SIGNED-BYTE
	91	# contains the units
	92
	93	self.value = struct.unpack('>iib', value)
	94
	95	elif self.value_tag == IPPTags.RANGE_OF_INTEGER:
	96	# Eight octets consisting of 2 SIGNED-INTEGERs. The first
	97	# SIGNED-INTEGER contains the lower bound and the second
	98	# SIGNED-INTEGER contains the upper bound.
	99
	100	self.value = struct.unpack('>ii', value)
	101
	102	elif self.value_tag == IPPTags.TEXT_WITH_LANGUAGE or \
	103	self.value_tag == IPPTags.NAME_WITH_LANGUAGE:
	104	a = struct.unpack('>h', value[:2])[0]
	105	b = struct.unpack('>%ss' % a, value[2:a+2])[0]
	106	c = struct.unpack('>h', value[a+2:a+4])[0]
	107	d = struct.unpack('>%ss' % c, value[a+4:][0])
	108	self.value = (a, b, c, d)
	109
	110	# character string value tags
	111	elif self.value_tag == IPPTags.TEXT_WITHOUT_LANGUAGE or \
	112	self.value_tag == IPPTags.NAME_WITHOUT_LANGUAGE:
	113	self.value = str(value)
	114	elif self.value_tag == IPPTags.GENERIC_CHAR_STRING or \
	115	self.value_tag == IPPTags.KEYWORD or \
	116	self.value_tag == IPPTags.URI or \
	117	self.value_tag == IPPTags.URI_SCHEME or \
	118	self.value_tag == IPPTags.CHARSET or \
	119	self.value_tag == IPPTags.NATURAL_LANGUAGE or \
	120	self.value_tag == IPPTags.MIME_MEDIA_TYPE:
	121	self.value = str(value)
	122
	123	def valueToBinary(self):
	124
	125	# out-of-band value tags
	126	if self.value_tag == IPPTags.UNSUPPORTED or \
	127	self.value_tag == IPPTags.DEFAULT or \
	128	self.value_tag == IPPTags.UNKNOWN or \
	129	self.value_tag == IPPTags.NO_VALUE:
	130	return (0, '')
	131
	132	# integer value tags
	133	elif self.value_tag == IPPTags.GENERIC_INTEGER:
	134	pass
	135	elif self.value_tag == IPPTags.INTEGER:
	136	return (4, struct.pack('>i', self.value))
	137	elif self.value_tag == IPPTags.BOOLEAN:
	138	return (1, struct.pack('>?', self.value))
	139	elif self.value_tag == IPPTags.ENUM:
	140	return (4, struct.pack('>i', self.value))
	141
	142	# octet string value tags
	143	elif self.value_tag == IPPTags.UNSPECIFIED_OCTETSTRING:
	144	pass
	145	elif self.value_tag == IPPTags.DATETIME:
	146	# field octets contents range
	147	# ----- ------ -------- -----
	148	# 1 1-2 year 0..65536
	149	# 2 3 month 1..12
	150	# 3 4 day 1..31
	151	# 4 5 hour 0..23
	152	# 5 6 minutes 0..59
	153	# 6 7 seconds 0..60
	154	# (use 60 for leap-second)
	155	# 7 8 deci-seconds 0..9
	156	# 8 9 direction from UTC '+' / '-'
	157	# 9 10 hours from UTC 0..11
	158	# 10 11 minutes from UTC 0..59
	159
	160	return (11, struct.pack('>hbbbbbbcbb', self.value))
	161
	162	elif self.value_tag == IPPTags.RESOLUTION:
	163	# OCTET-STRING consisting of nine octets of 2
	164	# SIGNED-INTEGERs followed by a SIGNED-BYTE. The first
	165	# SIGNED-INTEGER contains the value of cross feed
	166	# direction resolution. The second SIGNED-INTEGER contains
	167	# the value of feed direction resolution. The SIGNED-BYTE
	168	# contains the units
	169
	170	return (9, struct.pack('>iib', self.value))
	171
	172	elif self.value_tag == IPPTags.RANGE_OF_INTEGER:
	173	# Eight octets consisting of 2 SIGNED-INTEGERs. The first
	174	# SIGNED-INTEGER contains the lower bound and the second
	175	# SIGNED-INTEGER contains the upper bound.
	176
	177	return (8, struct.pack('>ii', self.value))
	178
	179	elif self.value_tag == IPPTags.TEXT_WITH_LANGUAGE or \
	180	self.value_tag == IPPTags.NAME_WITH_LANGUAGE:
	181	a_bin = struct.pack('>h', self.value[0])
	182	b_bin = struct.pack('>%ss' % self.value[0], self.value[1])
	183	c_bin = struct.pack('>h', self.value[2])
	184	d_bin = struct.pack('>%ss' % self.value[2], self.value[3])
	185	return (4 + self.value[0] + self.value[2],
	186	a_bin + b_bin + c_bin + d_bin)
	187
	188	# character string value tags
	189	elif self.value_tag == IPPTags.TEXT_WITHOUT_LANGUAGE or \
	190	self.value_tag == IPPTags.NAME_WITHOUT_LANGUAGE:
	191	return (len(self.value), struct.pack('>%ss' % len(self.value), self.value))
	192	elif self.value_tag == IPPTags.GENERIC_CHAR_STRING or \
	193	self.value_tag == IPPTags.KEYWORD or \
	194	self.value_tag == IPPTags.URI or \
	195	self.value_tag == IPPTags.URI_SCHEME or \
	196	self.value_tag == IPPTags.CHARSET or \
	197	self.value_tag == IPPTags.NATURAL_LANGUAGE or \
	198	self.value_tag == IPPTags.MIME_MEDIA_TYPE:
	199	return (len(self.value), struct.pack('>%ss' % len(self.value), self.value))
	200
	201	return len(self.value), self.value

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