# Copyright (C) 2003-2007 Nominum, Inc.
#
# Permission to use, copy, modify, and distribute this software and its
# documentation for any purpose with or without fee is hereby granted,
# provided that the above copyright notice and this permission notice
# appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

import struct

import dns.rdata
import dns.rdatatype

class DS(dns.rdata.Rdata):
    """DS record

    @ivar key_tag: the key tag
    @type key_tag: int
    @ivar algorithm: the algorithm
    @type algorithm: int
    @ivar digest_type: the digest type
    @type digest_type: int
    @ivar digest: the digest
    @type digest: int
    @see: draft-ietf-dnsext-delegation-signer-14.txt"""

    __slots__ = ['key_tag', 'algorithm', 'digest_type', 'digest']
    
    def __init__(self, rdclass, rdtype, key_tag, algorithm, digest_type,
                 digest):
        super(DS, self).__init__(rdclass, rdtype)
        self.key_tag = key_tag
        self.algorithm = algorithm
        self.digest_type = digest_type
        self.digest = digest

    def to_text(self, origin=None, relativize=True, **kw):
        return '%d %d %d %s' % (self.key_tag, self.algorithm,
                                self.digest_type,
                                dns.rdata._hexify(self.digest,
                                                  chunksize=128))
        
    def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
        key_tag = tok.get_uint16()
        algorithm = tok.get_uint8()
        digest_type = tok.get_uint8()
        digest = tok.get_string()
        digest = digest.decode('hex_codec')
        tok.get_eol()
        return cls(rdclass, rdtype, key_tag, algorithm, digest_type,
                   digest)
    
    from_text = classmethod(from_text)

    def to_wire(self, file, compress = None, origin = None):
        header = struct.pack("!HBB", self.key_tag, self.algorithm,
                             self.digest_type)
        file.write(header)
        file.write(self.digest)
        
    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
        header = struct.unpack("!HBB", wire[current : current + 4])
        current += 4
        rdlen -= 4
        digest = wire[current : current + rdlen]
        return cls(rdclass, rdtype, header[0], header[1], header[2], digest)

    from_wire = classmethod(from_wire)

    def _cmp(self, other):
        hs = struct.pack("!HBB", self.key_tag, self.algorithm,
                         self.digest_type)
        ho = struct.pack("!HBB", other.key_tag, other.algorithm,
                         other.digest_type)
        v = cmp(hs, ho)
        if v == 0:
            v = cmp(self.digest, other.digest)
        return v

@@ -1222,21 +1222,17 @@
 igest'%5D%0A
-    
 %0A
+
     def 
@@ -1807,25 +1807,17 @@
 e=128))%0A
-        
 %0A
+
     def 
@@ -2009,32 +2009,316 @@
     
-digest = tok.get_string(
+chunks = %5B%5D%0A        while 1:%0A            t = tok.get()%0A            if t%5B0%5D == dns.tokenizer.EOL or t%5B0%5D == dns.tokenizer.EOF:%0A                break%0A            if t%5B0%5D != dns.tokenizer.IDENTIFIER:%0A                raise dns.exception.SyntaxError%0A            chunks.append(t%5B1%5D)%0A        digest = ''.join(chunks
 )%0A  
@@ -2363,30 +2363,8 @@
 c')%0A
-        tok.get_eol()%0A
     
@@ -2455,21 +2455,17 @@
 digest)%0A
-    
 %0A
+
     from
@@ -2730,24 +2730,16 @@
 digest)%0A
-        
 %0A    def

allow multiple chunks in DS RR Base64