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

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author Daniele Nicolodi <nicolodi@science.unitn.it>
date Wed, 23 Nov 2011 19:22:13 +0100
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-1:000000000000 0:f0afece42f48
1 function M = dunzip(Z)
2 % DUNZIP - decompress DZIP output to recover original data
3 %
4 % USAGE:
5 % M = dzip(Z)
6 %
7 % VARIABLES:
8 % Z = compressed variable to decompress
9 % M = decompressed output
10 %
11 % NOTES: (1) The input variable Z is created by the DZIP function and
12 % is a vector of type uint8
13 % (2) The decompressed output will have the same data type and
14 % dimensions as the original data provided to DZIP.
15 % (3) See DZIP for other notes.
16 % (4) Carefully tested, but no warranty; use at your own risk.
17 % (5) Michael Kleder, Nov 2005
18
19 import com.mathworks.mlwidgets.io.InterruptibleStreamCopier
20 a=java.io.ByteArrayInputStream(Z);
21 b=java.util.zip.InflaterInputStream(a);
22 isc = InterruptibleStreamCopier.getInterruptibleStreamCopier;
23 c = java.io.ByteArrayOutputStream;
24 isc.copyStream(b,c);
25 Q=typecast(c.toByteArray,'uint8');
26 cn = double(Q(1)); % class
27 nd = double(Q(2)); % # dims
28 s = typecast(Q(3:8*nd+2),'double')'; % size
29 Q=Q(8*nd+3:end);
30 if cn == 3
31 M = logical(Q);
32 elseif cn == 4
33 M = char(Q);
34 else
35 ct = {'double','single','logical','char','int8','uint8',...
36 'int16','uint16','int32','uint32','int64','uint64'};
37 M = typecast(Q,ct{cn});
38 end
39 M=reshape(M,s);
40 return