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function varargout = gzipdecode(varargin)
%
% output = gzipdecode(input)
% or
% output = gzipdecode(input,info)
%
% Decompressing a GZIP-compressed byte-stream to recover the original data
% This function depends on JVM in MATLAB or, can optionally use the ZMat
% toolbox (http://github.com/NeuroJSON/zmat)
%
% Copyright (c) 2012, Kota Yamaguchi
% URL: https://www.mathworks.com/matlabcentral/fileexchange/39526-byte-encoding-utilities
%
% Modified by: Qianqian Fang (q.fang <at> neu.edu)
%
% input:
% input: a string, int8/uint8 vector or numerical array to store the GZIP-compressed data
% info (optional): a struct produced by the zmat/lz4hcencode function during
% compression; if not given, the inputs/outputs will be treated as a
% 1-D vector
%
% output:
% output: the decompressed byte stream stored in a uint8 vector; if info is
% given, output will restore the original data's type and dimensions
%
% examples:
% [bytes, info]=gzipencode(eye(10));
% orig=gzipdecode(bytes,info);
%
% license:
% BSD or GPL version 3, see LICENSE_{BSD,GPLv3}.txt files for details
%
% -- this function is part of JSONLab toolbox (http://iso2mesh.sf.net/cgi-bin/index.cgi?jsonlab)
%
if (nargin == 0)
error('you must provide at least 1 input');
end
if (exist('zmat', 'file') == 2 || exist('zmat', 'file') == 3)
if (nargin > 1)
[varargout{1:nargout}] = zmat(varargin{1}, varargin{2:end});
else
[varargout{1:nargout}] = zmat(varargin{1}, 0, 'gzip', varargin{2:end});
end
return
elseif (isoctavemesh)
error('You must install the ZMat toolbox (http://github.com/NeuroJSON/zmat) to use this function in Octave');
end
error(javachk('jvm'));
if (ischar(varargin{1}))
varargin{1} = uint8(varargin{1});
end
input = typecast(varargin{1}(:)', 'uint8');
gzip = java.util.zip.GZIPInputStream(java.io.ByteArrayInputStream(input));
buffer = java.io.ByteArrayOutputStream();
org.apache.commons.io.IOUtils.copy(gzip, buffer);
gzip.close();
if (nargout > 0)
varargout{1} = typecast(buffer.toByteArray(), 'uint8')';
if (nargin > 1 && isstruct(varargin{2}) && isfield(varargin{2}, 'type'))
inputinfo = varargin{2};
varargout{1} = typecast(varargout{1}, inputinfo.type);
varargout{1} = reshape(varargout{1}, inputinfo.size);
end
end
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