[wasm] Wasm TimeZoneInfo implementation VFS (#17760)

* [wasm][bcl] TimeZoneInfo implementation for WebAssembly to read from WASM VFS `/zoneinfo`.

- Remove `TimeZoneInfo.WebAssembly.cs` file
- Remove source dependencies on `TimeZoneInfo.WebAssembly.cs`.
- Modify TimeZoneInfo for specific WASM functionality
   - Default root directory is `zoneinfo`
   -  Add icall `mono_timezone_get_local_name` for WASM in CreateLocal
- Add icall implementation
   - ves_icall_System_TimeZoneInfo_mono_timezone_get_local_name

* [wasm][build] Add `-s FORCE_FILESYSTEM=1` to mono wasm runtime build

- Required so that it includes support for loading pre preload packages

Message when generating the zoneinfo data.
   > Remember to build the main file with  -s FORCE_FILESYSTEM=1  so that it includes support for loading this file package

* [wasm] zoneinfo data and support files.

- Three files for zoneinfo VFS support.
   - `mono-webassembly-zoneinfo-fs-smd.js.metadata` - This is the separate metadata output by emscripten file-packager.  Used to parse the zoneinfo data in non browser environments.  See `runtime-tests.js`
   - `mono-webassembly-zoneinfo-fs.js` - Output by emscripten file-packager that will be referenced by browser environments to load the zoneinfo data into the VFS at `/zoneinfo`
   - `zoneinfo.data` - The binary file output by emscripten file-packager.  The file contains the actual zoneinfo data loaded into the VFS and parsed by `TimeZoneInfo`.

* [wasm][driver] Add backing support for icall `mono_timezone_get_local_name`

* Add TimeZone info test.

* [wasm][packger] Add `-s FORCE_FILESYSTEM=1`

- Required so that it includes support for loading preload packages

Message when generating the zoneinfo data.
   > Remember to build the main file with  -s FORCE_FILESYSTEM=1  so that it includes support for loading this file package

* Fix AOT tzd test

* Remove commented code lines for `TimeZoneInfo.WebAssembly.cs` module

* Regenerated zone info without --no-heap-copy as it causes problems.  This will create a warning in browser for now.

* Add zoneinfo support files to package

* Fix TimeZoneInfo tests to use the `--enable-fs` packager parameter

* Add back icall implementation after rebase
   - ves_icall_System_TimeZoneInfo_mono_timezone_get_local_name

* Add back backing support for icall `mono_timezone_get_local_name` after rebase

* Fix build error

* Add back zoneinfo tests to Makefile after rebase

* Fix packager zoneinfo sample builds.

* Address review comment about volatile not needed

* Address review comment about volatile not needed

* Address review comment about volatile not needed

* Address review comment volatile not needed

1 files changed, 38 insertions, 1 deletions

diff --git a/sdks/wasm/runtime-tests.js b/sdks/wasm/runtime-tests.js
index 7f3504a76e4..c42dff199b0 100644
--- a/sdks/wasm/runtime-tests.js
+++ b/sdks/wasm/runtime-tests.js
@@ -99,6 +99,7 @@ profilers = [];
 setenv = {};
 runtime_args = [];
 enable_gc = false;
+enable_zoneinfo = false;
 while (true) {
 	if (args [0].startsWith ("--profile=")) {
 		var arg = args [0].substring ("--profile=".length);
@@ -120,6 +121,9 @@ while (true) {
 	} else if (args [0] == "--enable-gc") {
 		enable_gc = true;
 		args = args.slice (1);
+	} else if (args [0] == "--enable-zoneinfo") {
+		enable_zoneinfo = true;
+		args = args.slice (1);			
 	} else {
 		break;
 	}
@@ -154,7 +158,40 @@ var Module = {
 			var f = Module.cwrap ('mono_wasm_enable_on_demand_gc', 'void', []);
 			f ();
 		}
-
+		if (enable_zoneinfo) {
+			// Load the zoneinfo data into the VFS rooted at /zoneinfo
+			FS.mkdir("zoneinfo");
+			Module['FS_createPath']('/', 'zoneinfo', true, true);
+			Module['FS_createPath']('/zoneinfo', 'Indian', true, true);
+			Module['FS_createPath']('/zoneinfo', 'Atlantic', true, true);
+			Module['FS_createPath']('/zoneinfo', 'US', true, true);
+			Module['FS_createPath']('/zoneinfo', 'Brazil', true, true);
+			Module['FS_createPath']('/zoneinfo', 'Pacific', true, true);
+			Module['FS_createPath']('/zoneinfo', 'Arctic', true, true);
+			Module['FS_createPath']('/zoneinfo', 'America', true, true);
+			Module['FS_createPath']('/zoneinfo/America', 'Indiana', true, true);
+			Module['FS_createPath']('/zoneinfo/America', 'Argentina', true, true);
+			Module['FS_createPath']('/zoneinfo/America', 'Kentucky', true, true);
+			Module['FS_createPath']('/zoneinfo/America', 'North_Dakota', true, true);
+			Module['FS_createPath']('/zoneinfo', 'Australia', true, true);
+			Module['FS_createPath']('/zoneinfo', 'Etc', true, true);
+			Module['FS_createPath']('/zoneinfo', 'Asia', true, true);
+			Module['FS_createPath']('/zoneinfo', 'Antarctica', true, true);
+			Module['FS_createPath']('/zoneinfo', 'Europe', true, true);
+			Module['FS_createPath']('/zoneinfo', 'Mexico', true, true);
+			Module['FS_createPath']('/zoneinfo', 'Africa', true, true);
+			Module['FS_createPath']('/zoneinfo', 'Chile', true, true);
+			Module['FS_createPath']('/zoneinfo', 'Canada', true, true);			
+			var zoneInfoData = read ('zoneinfo.data', 'binary');
+			var metadata = JSON.parse(read ("mono-webassembly-zoneinfo-fs-smd.js.metadata", 'utf-8'));
+			var files = metadata.files;
+			for (var i = 0; i < files.length; ++i) {
+				var byteArray = zoneInfoData.subarray(files[i].start, files[i].end);
+				var stream = FS.open(files[i].filename, 'w+');
+				FS.write(stream, byteArray, 0, byteArray.length, 0);
+				FS.close(stream);
+			}
+		}
 		MONO.mono_load_runtime_and_bcl (
 			config.vfs_prefix,
 			config.deploy_prefix,