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source: server/lib/ippvalue.py @ ebf327d

no-cups

Last change on this file since ebf327d was ebf327d, checked in by Jessica B. Hamrick <jhamrick@…>, 14 years ago
Change IPPValue, IPPAttribute, IPPAttributeGroup, and IPPRequest to Value, Attribute, AttributeGroup?, and Request, respectively, to make things a little less verbose
Property mode set to `100644`
File size: 9.0 KB

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

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