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/fangq/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/fangq/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
