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## Copyright (C) 2012-2022 Alexander Barth <barth.alexander@gmail.com>
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; If not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {} {@var{fname} =} cached_decompress(@var{filename})
## Decompress a file using a cache.
##
## @subsubheading Inputs
## @var{filename}: name of the file which is possibly compressed
##
## @subsubheading Outputs
## @var{fname}: the filename of the uncompressed file
##
## @subsubheading Global variables
## CACHED_DECOMPRESS_DIR (default is the result of tempname)
## cache directory of decompressed files.
##
## CACHED_DECOMPRESS_LOG_FID (default 1): file id for log message
##
## CACHED_DECOMPRESS_MAX_SIZE (default 1e10): maximum size of cache in bytes.
## @end deftypefn
function fname = cached_decompress(url)
global CACHED_DECOMPRESS_DIR
global CACHED_DECOMPRESS_LOG_FID
global CACHED_DECOMPRESS_MAX_SIZE
if startswith(url,'http:') || ...
~(endswith(url,'.gz') || endswith(url,'.bz2') || endswith(url,'.xz'))
% opendap url or not compressed file
fname = url;
return
endif
cache_dir = CACHED_DECOMPRESS_DIR;
if isempty(cache_dir)
cache_dir = tempname;
CACHED_DECOMPRESS_DIR = cache_dir;
mkdir(cache_dir);
fprintf('creating directory %s for temporary files.\n',cache_dir);
endif
%if exist(cache_dir,'dir') ~= 7
% error(['cache directory for compressed files does not exist. '...
% 'Please create the directory %s or change le value of the '...
% 'global variable CACHED_DECOMPRESS_DIR'],cache_dir);
%endif
% where to print logs? default to screen
fid = CACHED_DECOMPRESS_LOG_FID;
if (isempty(fid))
fid = 1;
endif
% form filename for cache
fname = url;
fname = strrep(fname,'/','_SLASH_');
fname = strrep(fname,'*','_STAR_');
fname = strrep(fname,'\','_BSLASH_');
fname = strrep(fname,':','_COLON_');
fname = fullfile(cache_dir,fname);
% test if in cache
if exist(fname,'file') ~= 2
if ispc()
# TODO - just do for all OSs?
tmp_dir = tempname ();
[success, msg] = mkdir (tmp_dir);
if (success != 1)
error ("failed to create temporary directory: %s", msg);
endif
unwind_protect
looks_like_url = regexp (url, '^\w+://');
if looks_like_url;
[~, name, ext] = fileparts (url);
tmp_file = fullfile (tmp_dir, [name ext]);
[~, success, msg] = urlwrite (url, tmp_file);
if (success != 1)
error ("failed downloading '%s': %s", url, msg);
endif
else
[~, name, ext] = fileparts (url);
tmp_file = fullfile (tmp_dir, ["tmp_" name ext]);
success = copyfile(url, tmp_file);
if (success != 1)
error ("failed copying '%s'", url);
endif
endif
if !exist (tmp_file, "file")
error ("No local file '%s' found\n", tmp_file);
endif
if endswith(url,'.zip')
func_uncomp = @unzip;
elseif endswith(url,'.gz')
func_uncomp = @gunzip;
elseif endswith(url,'.bz2')
func_uncomp = @bunzip2;
else
func_uncomp = [];
endif
if !isempty(func_uncomp)
files = func_uncomp(tmp_file, tmp_dir);
else
files = {tmp_file};
endif
if length(files) != 1
error ("Expected single file being added");
endif
success = copyfile(files{1}, fname);
if (success != 1)
error ("Failed to copy file to cache");
endif
unwind_protect_cleanup
if (exist (tmp_dir, "file"))
confirm_recursive_rmdir (0, "local");
rmdir(tmp_dir, "s");
endif
end_unwind_protect
else
# else try via command (after checking it exists?)
if endswith(url,'.gz')
cmd = 'gunzip --stdout -';
elseif endswith(url,'.bz2')
cmd = 'bunzip2 --stdout -';
elseif endswith(url,'.xz')
cmd = 'unxz --stdout -';
else
cmd = 'cat';
endif
if startswith(url,'ftp://')
syscmd('curl --silent "%s" | %s > "%s"',url,cmd,fname);
else
syscmd('%s < "%s" > "%s"',cmd,url,fname);
endif
endif
else
% fprintf(fid,'retrieve from cache %s\n',url);
endif
% check cache size
d=dir(cache_dir);
cashe_size = sum([d.bytes]);
max_cache_size = CACHED_DECOMPRESS_MAX_SIZE;
if isempty(max_cache_size)
max_cache_size = 1e10;
endif
if (cashe_size > max_cache_size)
% look for oldest files
fdate = zeros(1,length(d));
for i=1:length(d);
fdate(i) = datenum(d(i).date);
endfor
[fdate,index] = sort(fdate,'descend');
d=d(index);
cum_size = cumsum([d(:).bytes]);
todelete = find(cum_size > max_cache_size);
for i=todelete
if (d(i).isdir == 0)
fprintf(fid,'clean cashe: delete %s\n', d(i).name);
delete(fullfile(cache_dir,d(i).name));
endif
endfor
endif
endfunction
function t = startswith(s,ext)
if length(ext) <= length(s)
t = strcmp(s(1:length(ext)),ext);
else
t = 0;
endif
endfunction
function t = endswith(s,ext)
if length(ext) <= length(s)
t = strcmp(s(end-length(ext)+1:end),ext);
else
t = 0;
endif
endfunction
function syscmd(varargin)
cmd = sprintf(varargin{:});
%disp(cmd)
status = 0;
[status, output] = system(cmd);
disp(output);
if status ~= 0
error(['command "' cmd '" failed: ' output]);
endif
endfunction
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