windows: disk{available,capacity}: 4x faster with .NET

Author: scivision

+stdlib/disk_available.m

@@ -1,5 +1,5 @@
 %% DISK_AVAILABLE disk available space (bytes)
-% requires: mex or java
+% optional: mex
 %
 % example:  stdlib.disk_available('/')
 %
@@ -10,10 +10,14 @@
   d {mustBeTextScalar}
 end
 
-f = javaFileObject(d).getUsableSpace();
-
-f = uint64(f);
+f = uint64(0);
+if ~stdlib.exists(d), return, end
 
+if ispc()
+  f = System.IO.DriveInfo(stdlib.absolute(d)).AvailableFreeSpace();
+else
+  f = javaFileObject(d).getUsableSpace();
+  f = uint64(f);
 end
 
 %!assert (disk_available('.') > 0)

+stdlib/disk_capacity.m

@@ -1,5 +1,5 @@
 %% DISK_CAPACITY disk total capacity (bytes)
-% requires: mex or java
+% optional: mex
 %
 % example:  stdlib.disk_capacity('/')
 
@@ -8,9 +8,15 @@
   d {mustBeTextScalar}
 end
 
-f = javaFileObject(d).getTotalSpace();
+f = uint64(0);
+if ~stdlib.exists(d), return, end
 
-f = uint64(f);
+if ispc()
+  f = System.IO.DriveInfo(stdlib.absolute(d)).TotalSize();
+else
+  f = javaFileObject(d).getTotalSpace();
+  f = uint64(f);
+end
 
 end
 

test/TestDisk.m

@@ -4,22 +4,12 @@
 Ps = {".", "", "not-exist"}
 end
 
-methods(Test, TestTags = ["mex"])
-
-function test_mex_disk_available(tc)
-tc.assertTrue(stdlib.is_mex_fun("stdlib.disk_available"))
-end
-
-function test_mex_disk_capacity(tc)
-tc.assertTrue(stdlib.is_mex_fun("stdlib.disk_capacity"))
-end
-
-end
-
-methods (Test, TestTags = ["java"])
+methods (Test)
 
 function test_disk_available(tc, Ps)
 
+tc.assumeTrue(ispc() || stdlib.has_java() || stdlib.is_mex_fun("stdlib.disk_available"))
+
 zero = uint64(0);
 
 if stdlib.exists(Ps)
@@ -29,8 +19,11 @@ function test_disk_available(tc, Ps)
 end
 end
 
+
 function test_disk_capacity(tc, Ps)
 
+tc.assumeTrue(ispc() || stdlib.has_java() || stdlib.is_mex_fun("stdlib.disk_capacity"))
+
 zero = uint64(0);
 
 if stdlib.exists(Ps)