yap-6.3/packages/ProbLog/problog/os.yap

%%% -*- Mode: Prolog; -*-

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%  $Date: 2010-09-28 21:04:43 +0200 (Tue, 28 Sep 2010) $
%  $Revision: 4838 $
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%  This file is part of ProbLog
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%  ProbLog was developed at Katholieke Universiteit Leuven
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%  Theofrastos Mantadelis, Bernd Gutmann
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%%%%%%%%
% Collected OS depended instructions
%%%%%%%%
:- module(os, [set_problog_path/1,
	       problog_path/1,
	       convert_filename_to_working_path/2,
	       convert_filename_to_problog_path/2,
	       concat_path_with_filename/3,
	       calc_md5/2]).


% load library modules
:- use_module(library(system), [exec/3, file_exists/1]).

% load our own modules
:- use_module(gflags, _, [flag_get/2]).

:- dynamic(problog_path/1).
:- dynamic(problog_working_path/1).

set_problog_path(Path):-
	retractall(problog_path(_)),
	assertz(problog_path(Path)).

convert_filename_to_working_path(File_Name, Path):-
	flag_get(dir, Dir),
	concat_path_with_filename(Dir, File_Name, Path).

convert_filename_to_problog_path(File_Name, Path):-
	problog_path(Dir),
	concat_path_with_filename(Dir, File_Name, Path).

concat_path_with_filename(Path, File_Name, Result):-
	nonvar(File_Name),
	nonvar(Path),

	% make sure, that there is no path delimiter at the end
	prolog_file_name(Path,Path_Absolute),

	(
	 yap_flag(windows, true)
	->
	 Path_Seperator = '\\';
	 Path_Seperator = '/'
	),

	 atomic_concat([Path_Absolute, Path_Seperator, File_Name], Result).

%========================================================================
%= Calculate the MD5 checksum of +Filename by calling md5sum
%= in case m5sum is not installed, try md5, otherwise fail
%= +Filename, -MD5
%========================================================================

calc_md5(Filename,MD5):-
	catch(calc_md5_intern(Filename,'md5sum',MD5),_,fail),
	!.
calc_md5(Filename,MD5):-
	catch(calc_md5_intern(Filename,'md5',MD5),_,fail),
	!.
calc_md5(Filename,MD5):-
	throw(md5error(calc_md5(Filename,MD5))).

calc_md5_intern(Filename,Command,MD5) :-
	( file_exists(Filename) -> true ; throw(md5_file(Filename)) ),

	atomic_concat([Command,' "',Filename,'"'],Call),  

	% execute the md5 command
	exec(Call,[null,pipe(S),null],_PID),
	bb_put(calc_md5_temp,End-End),  % use difference list
	bb_put(calc_md5_temp2,0),

	%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
	(	% read 32 Bytes from stdout of process
		repeat,
		get_code(S,C),

		(
		 C== -1
		->
		 (
		  close(S),
		  throw(md5error('premature end of output stream, please check os.yap calc_md5/2'))
		 );
		 true
		),

		bb_get(calc_md5_temp,List-[C|NewEnd]),
		bb_put(calc_md5_temp,List-NewEnd),
		bb_get(calc_md5_temp2,OldLength),
		NewLength is OldLength+1,
		bb_put(calc_md5_temp2,NewLength),
		NewLength=32
	),
	%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
	!,
	
	close(S),
	bb_delete(calc_md5_temp, FinalList-[]),
	bb_delete(calc_md5_temp2,_),
	atom_codes(MD5,FinalList).