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#
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# Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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# All rights reserved.
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# This component and the accompanying materials are made available
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# under the terms of "Eclipse Public License v1.0"
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# which accompanies this distribution, and is available
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# at the URL "http://www.eclipse.org/legal/epl-v10.html".
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#
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# Initial Contributors:
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# Nokia Corporation - initial contribution.
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#
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# Contributors:
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#
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# Description:
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#
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from struct import pack, unpack
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from hcrplugin.hcr_exceptions import InvalidHcrHeaderError
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class HcrHeader(object):
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"""
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"""
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HEADER_FMT = '<4sHHIII12x'
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HEADER_SIGNATURE = 'HCRf'
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def __init__(self):
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self.version = 0
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self.flags = 0
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self.nrecords = 0
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self.lsd_offset = 0
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self.lsd_size = 0
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def loads(self, headerstr):
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if len(headerstr) != 32:
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raise InvalidHcrHeaderError('Invalid length of header data %r' % headerstr)
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result = unpack(self.HEADER_FMT, headerstr)
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if not result[0] == self.HEADER_SIGNATURE:
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raise InvalidHcrHeaderError('Invalid HCR signature in %r' % headerstr)
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self.version = result[1]
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self.flags = result[2]
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self.nrecords = result[3]
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self.lsd_offset = result[4]
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self.lsd_size = result[5]
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def dumps(self):
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return pack(self.HEADER_FMT, self.HEADER_SIGNATURE, self.version,
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self.flags,
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self.nrecords,
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self.lsd_offset,
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self.lsd_size) |