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annotate m-toolbox/classes/+utils/@helper/dunzip.m @ 0:f0afece42f48

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Import.
author Daniele Nicolodi <nicolodi@science.unitn.it>
date Wed, 23 Nov 2011 19:22:13 +0100
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Daniele Nicolodi <nicolodi@science.unitn.it>
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1 function M = dunzip(Z)
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Daniele Nicolodi <nicolodi@science.unitn.it>
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2 % DUNZIP - decompress DZIP output to recover original data
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Daniele Nicolodi <nicolodi@science.unitn.it>
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3 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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4 % USAGE:
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Daniele Nicolodi <nicolodi@science.unitn.it>
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5 % M = dzip(Z)
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6 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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7 % VARIABLES:
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Daniele Nicolodi <nicolodi@science.unitn.it>
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8 % Z = compressed variable to decompress
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Daniele Nicolodi <nicolodi@science.unitn.it>
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9 % M = decompressed output
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10 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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11 % NOTES: (1) The input variable Z is created by the DZIP function and
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Daniele Nicolodi <nicolodi@science.unitn.it>
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12 % is a vector of type uint8
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Daniele Nicolodi <nicolodi@science.unitn.it>
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13 % (2) The decompressed output will have the same data type and
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Daniele Nicolodi <nicolodi@science.unitn.it>
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14 % dimensions as the original data provided to DZIP.
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Daniele Nicolodi <nicolodi@science.unitn.it>
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15 % (3) See DZIP for other notes.
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16 % (4) Carefully tested, but no warranty; use at your own risk.
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Daniele Nicolodi <nicolodi@science.unitn.it>
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17 % (5) Michael Kleder, Nov 2005
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18
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Daniele Nicolodi <nicolodi@science.unitn.it>
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19 import com.mathworks.mlwidgets.io.InterruptibleStreamCopier
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Daniele Nicolodi <nicolodi@science.unitn.it>
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20 a=java.io.ByteArrayInputStream(Z);
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21 b=java.util.zip.InflaterInputStream(a);
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Daniele Nicolodi <nicolodi@science.unitn.it>
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22 isc = InterruptibleStreamCopier.getInterruptibleStreamCopier;
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23 c = java.io.ByteArrayOutputStream;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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24 isc.copyStream(b,c);
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Daniele Nicolodi <nicolodi@science.unitn.it>
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25 Q=typecast(c.toByteArray,'uint8');
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26 cn = double(Q(1)); % class
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27 nd = double(Q(2)); % # dims
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Daniele Nicolodi <nicolodi@science.unitn.it>
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28 s = typecast(Q(3:8*nd+2),'double')'; % size
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29 Q=Q(8*nd+3:end);
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Daniele Nicolodi <nicolodi@science.unitn.it>
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30 if cn == 3
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31 M = logical(Q);
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32 elseif cn == 4
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33 M = char(Q);
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34 else
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Daniele Nicolodi <nicolodi@science.unitn.it>
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35 ct = {'double','single','logical','char','int8','uint8',...
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Daniele Nicolodi <nicolodi@science.unitn.it>
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36 'int16','uint16','int32','uint32','int64','uint64'};
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Daniele Nicolodi <nicolodi@science.unitn.it>
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37 M = typecast(Q,ct{cn});
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Daniele Nicolodi <nicolodi@science.unitn.it>
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38 end
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Daniele Nicolodi <nicolodi@science.unitn.it>
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39 M=reshape(M,s);
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Daniele Nicolodi <nicolodi@science.unitn.it>
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40 return