Fixes #3508

2 files changed, 29 insertions, 1 deletions

diff --git a/src/bun.js/bindings/bindings.zig b/src/bun.js/bindings/bindings.zig
index 777860d3c..277172b81 100644
--- a/src/bun.js/bindings/bindings.zig
+++ b/src/bun.js/bindings/bindings.zig
@@ -291,7 +291,27 @@ pub const ZigString = extern struct {
         return this.len * 2;
     }
 
-    /// Count the number of code points in the string.
+    pub fn utf16ByteLength(this: ZigString) usize {
+        if (this.isUTF8()) {
+            return bun.simdutf.length.utf16.from.utf8.le(this.slice());
+        }
+
+        if (this.is16Bit()) {
+            return this.len * 2;
+        }
+
+        return JSC.WebCore.Encoder.byteLengthU8(this.slice().ptr, this.slice().len, .utf16le);
+    }
+
+    pub fn latin1ByteLength(this: ZigString) usize {
+        if (this.isUTF8()) {
+            @panic("TODO");
+        }
+
+        return this.len;
+    }
+
+    /// Count the number of bytes in the UTF-8 version of the string.
     /// This function is slow. Use maxUITF8ByteLength() to get a quick estimate
     pub fn utf8ByteLength(this: ZigString) usize {
         if (this.isUTF8()) {
diff --git a/src/bun.js/webcore/encoding.zig b/src/bun.js/webcore/encoding.zig
index 061a25eed..bb1180acb 100644
--- a/src/bun.js/webcore/encoding.zig
+++ b/src/bun.js/webcore/encoding.zig
@@ -985,6 +985,14 @@ pub const Encoder = struct {
         }
     }
 
+    pub fn encodeIntoFrom16(input: []const u16, to: []u8, comptime encoding: JSC.Node.Encoding, comptime allow_partial_write: bool) !usize {
+        return writeU16(input.ptr, input.len, to.ptr, to.len, encoding, allow_partial_write);
+    }
+
+    pub fn encodeIntoFrom8(input: []const u8, to: []u8, comptime encoding: JSC.Node.Encoding) !usize {
+        return writeU8(input.ptr, input.len, to.ptr, to.len, encoding);
+    }
+
     pub fn writeU16(input: [*]const u16, len: usize, to: [*]u8, to_len: usize, comptime encoding: JSC.Node.Encoding, comptime allow_partial_write: bool) !usize {
         if (len == 0)
             return 0;