add fileio.sha256sum

Author: scivision

+stdlib/+fileio/extract_zstd.m

@@ -9,7 +9,9 @@ function extract_zstd(archive, out_dir)
   out_dir (1,1) string
 end
 
-archive = stdlib.fileio.expanduser(archive);
+import stdlib.fileio.expanduser
+
+archive = expanduser(archive);
 
 assert(isfile(archive), "%s is not a file", archive)
 

+stdlib/+fileio/is_absolute_path.m

@@ -8,7 +8,9 @@
   apath string
 end
 
-apath = stdlib.fileio.expanduser(apath);
+import stdlib.fileio.expanduser
+
+apath = expanduser(apath);
 
 if ispc
   i = strlength(apath) < 3;

+stdlib/+fileio/md5sum.m

@@ -4,16 +4,13 @@
   file (1,1) string
 end
 
-file = stdlib.fileio.expanduser(file);
+import stdlib.fileio.expanduser
 
+file = expanduser(file);
 assert(isfile(file), '%s not found', file)
 
 hash = string.empty;
 
-if verLessThan('matlab', '9.7')
-  return
-end
-
 if ismac
   [stat,hash] = system("md5 -r " + file);
 elseif isunix

+stdlib/+fileio/samepath.m

@@ -2,5 +2,8 @@
 %% issame = samepath(path1, path)
 % true if inputs resolve to same path
 
-issame = gemini3d.fileio.absolute_path(path1) == gemini3d.fileio.absolute_path(path2);
+import stdlib.fileio.absolute_path
+
+issame = absolute_path(path1) == absolute_path(path2);
+
 end

+stdlib/+fileio/sha256sum.m

@@ -0,0 +1,32 @@
+function hash = sha256sum(file)
+% compute sha256 hash of file
+arguments
+  file (1,1) string
+end
+
+import stdlib.fileio.expanduser
+
+file = expanduser(file);
+assert(isfile(file), '%s not found', file)
+
+hash = string.empty;
+
+if ismac
+  [stat,hash] = system("shasum --algorithm 256 --binary " + file);
+elseif isunix
+  [stat,hash] = system("sha256sum --binary " + file);
+elseif ispc
+  [stat,hash] = system("CertUtil -hashfile " + file + " SHA256");
+else
+  return
+end
+
+if stat ~= 0
+  return
+end
+
+hash = regexp(hash,'^\w{64}','match','once','lineanchors');
+
+assert(strlength(hash)==64, 'SHA256 hash is 64 characters')
+
+end % function