Map ArrayBuffer and ArrayBufferView to u8.

Depends on lightpanda-io/zig-v8-fork#86

Built ontop of #906 just because
this is the feature that uses it.

Author: karlseguin

build.zig.zon

@@ -13,8 +13,8 @@
             .hash = "tigerbeetle_io-0.0.0-ViLgxpyRBAB5BMfIcj3KMXfbJzwARs9uSl8aRy2OXULd",
         },
         .v8 = .{
-            .url = "https://github.com/lightpanda-io/zig-v8-fork/archive/10025d52cb1d33434f18634c326e67038fd927d5.tar.gz",
-            .hash = "v8-0.0.0-xddH6-vCAwCtIRfzEw1zKu0TnMbDrFltZ8I0x-PALyIh",
+            .url = "https://github.com/lightpanda-io/zig-v8-fork/archive/b22911e02e4884a76acf52aa9aff2ba169d05b40.tar.gz",
+            .hash = "v8-0.0.0-xddH69zCAwAzm1u5cQVa-uG5ib2y6PpENXCl8yEYdUYk",
         },
         //.v8 = .{ .path = "../zig-v8-fork" },
         //.tigerbeetle_io = .{ .path = "../tigerbeetle-io" },

src/browser/encoding/TextDecoder.zig

@@ -92,6 +92,7 @@ test "Browser.Encoding.TextDecoder" {
         .{ "d1.ignoreBOM", "false" },
         .{ "d1.decode(new Uint8Array([240, 160, 174, 183]))", "𠮷" },
         .{ "d1.decode(new Uint8Array([0xEF, 0xBB, 0xBF, 240, 160, 174, 183]))", "𠮷" },
+        .{ "d1.decode(new Uint8Array([49, 50]).buffer)", "12" },
 
         .{ "let d2 = new TextDecoder('utf8', {fatal: true})", null },
         .{

src/runtime/js.zig

@@ -953,9 +953,21 @@ pub fn Env(comptime State: type, comptime WebApis: type) type {
                             }
                         },
                         .slice => {
+                            var force_u8 = false;
+                            var array_buffer: ?v8.ArrayBuffer = null;
                             if (js_value.isTypedArray()) {
                                 const buffer_view = js_value.castTo(v8.ArrayBufferView);
-                                const buffer = buffer_view.getBuffer();
+                                array_buffer = buffer_view.getBuffer();
+                            } else if (js_value.isArrayBufferView()) {
+                                force_u8 = true;
+                                const buffer_view = js_value.castTo(v8.ArrayBufferView);
+                                array_buffer = buffer_view.getBuffer();
+                            } else if (js_value.isArrayBuffer()) {
+                                force_u8 = true;
+                                array_buffer = js_value.castTo(v8.ArrayBuffer);
+                            }
+
+                            if (array_buffer) |buffer| {
                                 const backing_store = v8.BackingStore.sharedPtrGet(&buffer.getBackingStore());
                                 const data = backing_store.getData();
                                 const byte_len = backing_store.getByteLength();
@@ -964,7 +976,7 @@ pub fn Env(comptime State: type, comptime WebApis: type) type {
                                     u8 => {
                                         // need this sentinel check to keep the compiler happy
                                         if (ptr.sentinel() == null) {
-                                            if (js_value.isUint8Array() or js_value.isUint8ClampedArray()) {
+                                            if (force_u8 or js_value.isUint8Array() or js_value.isUint8ClampedArray()) {
                                                 const arr_ptr = @as([*]u8, @alignCast(@ptrCast(data)));
                                                 return arr_ptr[0..byte_len];
                                             }