Merge pull request #578 from napi-rs/arraybuffer

feat(napi): impl more types AsRef and AsMut for TypedArray

napi/src/env.rs

@@ -417,7 +417,8 @@ impl Env {
 
     Ok(JsArrayBufferValue::new(
       unsafe { JsArrayBuffer::from_raw_unchecked(self.0, raw_value) },
-      mem::ManuallyDrop::new(data),
+      data_ptr as *mut c_void,
+      length,
     ))
   }
 
@@ -437,13 +438,15 @@ impl Env {
       )
     })?;
 
+    mem::forget(data);
     Ok(JsArrayBufferValue::new(
       JsArrayBuffer(Value {
         env: self.0,
         value: raw_value,
         value_type: ValueType::Object,
       }),
-      mem::ManuallyDrop::new(data),
+      data_ptr as *mut c_void,
+      length,
     ))
   }
 
@@ -486,7 +489,8 @@ impl Env {
         value: raw_value,
         value_type: ValueType::Object,
       }),
-      mem::ManuallyDrop::new(Vec::from_raw_parts(data as *mut u8, length, length)),
+      data as *mut c_void,
+      length,
     ))
   }
 

napi/src/js_values/arraybuffer.rs

@@ -1,4 +1,3 @@
-use std::mem;
 use std::ops::{Deref, DerefMut};
 use std::os::raw::c_void;
 use std::ptr;
@@ -10,7 +9,8 @@ pub struct JsArrayBuffer(pub(crate) Value);
 
 pub struct JsArrayBufferValue {
   pub(crate) value: JsArrayBuffer,
-  data: mem::ManuallyDrop<Vec<u8>>,
+  len: usize,
+  data: *mut c_void,
 }
 
 pub struct JsTypedArray(pub(crate) Value);
@@ -34,6 +34,7 @@ pub struct JsDataViewValue {
 
 #[repr(i32)]
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
+#[non_exhaustive]
 pub enum TypedArrayType {
   Int8 = 0,
   Uint8,
@@ -44,7 +45,9 @@ pub enum TypedArrayType {
   Uint32,
   Float32,
   Float64,
+  #[cfg(feature = "napi6")]
   BigInt64,
+  #[cfg(feature = "napi6")]
   BigUint64,
 
   /// compatible with higher versions
@@ -63,7 +66,9 @@ impl From<sys::napi_typedarray_type> for TypedArrayType {
       sys::TypedarrayType::napi_uint32_array => Self::Uint32,
       sys::TypedarrayType::napi_float32_array => Self::Float32,
       sys::TypedarrayType::napi_float64_array => Self::Float64,
+      #[cfg(feature = "napi6")]
       sys::TypedarrayType::napi_bigint64_array => Self::BigInt64,
+      #[cfg(feature = "napi6")]
       sys::TypedarrayType::napi_biguint64_array => Self::BigUint64,
       _ => Self::Unknown,
     }
@@ -72,7 +77,7 @@ impl From<sys::napi_typedarray_type> for TypedArrayType {
 
 impl From<TypedArrayType> for sys::napi_typedarray_type {
   fn from(value: TypedArrayType) -> sys::napi_typedarray_type {
-    value as _
+    value as i32
   }
 }
 
@@ -98,16 +103,12 @@ impl JsArrayBuffer {
     let mut data = ptr::null_mut();
     let mut len: usize = 0;
     check_status!(unsafe {
-      sys::napi_get_arraybuffer_info(
-        self.0.env,
-        self.0.value,
-        &mut data,
-        &mut len as *mut usize as *mut _,
-      )
+      sys::napi_get_arraybuffer_info(self.0.env, self.0.value, &mut data, &mut len as *mut usize)
     })?;
     Ok(JsArrayBufferValue {
-      data: mem::ManuallyDrop::new(unsafe { Vec::from_raw_parts(data as *mut _, len, len) }),
+      data,
       value: self,
+      len,
     })
   }
 
@@ -163,8 +164,8 @@ impl JsArrayBuffer {
 
 impl JsArrayBufferValue {
   #[inline]
-  pub fn new(value: JsArrayBuffer, data: mem::ManuallyDrop<Vec<u8>>) -> Self {
-    JsArrayBufferValue { value, data }
+  pub fn new(value: JsArrayBuffer, data: *mut c_void, len: usize) -> Self {
+    JsArrayBufferValue { value, len, data }
   }
 
   #[inline]
@@ -180,7 +181,13 @@ impl JsArrayBufferValue {
 
 impl AsRef<[u8]> for JsArrayBufferValue {
   fn as_ref(&self) -> &[u8] {
-    self.data.as_slice()
+    unsafe { slice::from_raw_parts(self.data as *const u8, self.len) }
+  }
+}
+
+impl AsMut<[u8]> for JsArrayBufferValue {
+  fn as_mut(&mut self) -> &mut [u8] {
+    unsafe { slice::from_raw_parts_mut(self.data as *mut u8, self.len) }
   }
 }
 
@@ -188,13 +195,13 @@ impl Deref for JsArrayBufferValue {
   type Target = [u8];
 
   fn deref(&self) -> &[u8] {
-    self.data.as_slice()
+    self.as_ref()
   }
 }
 
 impl DerefMut for JsArrayBufferValue {
   fn deref_mut(&mut self) -> &mut Self::Target {
-    self.data.as_mut_slice()
+    self.as_mut()
   }
 }
 
@@ -218,7 +225,7 @@ impl JsTypedArray {
         &mut len as *mut u64 as *mut _,
         &mut data,
         &mut arraybuffer_value,
-        &mut byte_offset as *mut u64 as *mut _,
+        &mut byte_offset as *mut u64 as *mut usize,
       )
     })?;
 
@@ -232,26 +239,34 @@ impl JsTypedArray {
   }
 }
 
-impl JsTypedArrayValue {
-  #[inline(always)]
-  fn as_slice(&self) -> &[u8] {
-    unsafe { slice::from_raw_parts(self.data as *const u8, self.length as usize) }
+macro_rules! impl_as_ref {
+  ($ref_type:ident) => {
+    impl AsRef<[$ref_type]> for JsTypedArrayValue {
+      fn as_ref(&self) -> &[$ref_type] {
+        unsafe { slice::from_raw_parts(self.data as *const $ref_type, self.length as usize) }
       }
+    }
+
+    impl AsMut<[$ref_type]> for JsTypedArrayValue {
+      fn as_mut(&mut self) -> &mut [$ref_type] {
+        unsafe { slice::from_raw_parts_mut(self.data as *mut $ref_type, self.length as usize) }
+      }
+    }
+  };
 }
 
-impl AsRef<[u8]> for JsTypedArrayValue {
-  fn as_ref(&self) -> &[u8] {
-    self.as_slice()
-  }
-}
-
-impl Deref for JsTypedArrayValue {
-  type Target = [u8];
-
-  fn deref(&self) -> &[u8] {
-    self.as_slice()
-  }
-}
+impl_as_ref!(u8);
+impl_as_ref!(i8);
+impl_as_ref!(u16);
+impl_as_ref!(i16);
+impl_as_ref!(u32);
+impl_as_ref!(i32);
+impl_as_ref!(f32);
+impl_as_ref!(f64);
+#[cfg(feature = "napi6")]
+impl_as_ref!(i64);
+#[cfg(feature = "napi6")]
+impl_as_ref!(u64);
 
 impl JsDataView {
   #[inline]

sys/src/lib.rs

@@ -98,7 +98,9 @@ pub mod TypedarrayType {
   pub const napi_uint32_array: i32 = 6;
   pub const napi_float32_array: i32 = 7;
   pub const napi_float64_array: i32 = 8;
+  #[cfg(feature = "napi6")]
   pub const napi_bigint64_array: i32 = 9;
+  #[cfg(feature = "napi6")]
   pub const napi_biguint64_array: i32 = 10;
 }
 

test_module/__test__/arraybuffer.spec.ts

@@ -1,8 +1,48 @@
-import test from 'ava'
+import ava from 'ava'
+
+import { napiVersion } from './napi-version'
 
 const bindings = require('../index.node')
 
+const test = napiVersion >= 6 ? ava : ava.skip
+
 test('should get arraybuffer length', (t) => {
   const fixture = Buffer.from('wow, hello')
   t.is(bindings.getArraybufferLength(fixture.buffer), fixture.buffer.byteLength)
 })
+
+test('should be able to mutate Uint8Array', (t) => {
+  const fixture = new Uint8Array([0, 1, 2])
+  bindings.mutateUint8Array(fixture)
+  t.is(fixture[0], 42)
+})
+
+test('should be able to mutate Uint16Array', (t) => {
+  const fixture = new Uint16Array([0, 1, 2])
+  bindings.mutateUint16Array(fixture)
+  t.is(fixture[0], 65535)
+})
+
+test('should be able to mutate Int16Array', (t) => {
+  const fixture = new Int16Array([0, 1, 2])
+  bindings.mutateInt16Array(fixture)
+  t.is(fixture[0], 32767)
+})
+
+test('should be able to mutate Float32Array', (t) => {
+  const fixture = new Float32Array([0, 1, 2])
+  bindings.mutateFloat32Array(fixture)
+  t.true(Math.abs(fixture[0] - 3.14) <= 0.0001)
+})
+
+test('should be able to mutate Float64Array', (t) => {
+  const fixture = new Float64Array([0, 1, 2])
+  bindings.mutateFloat64Array(fixture)
+  t.true(Math.abs(fixture[0] - Math.PI) <= 0.0000001)
+})
+
+test('should be able to mutate BigInt64Array', (t) => {
+  const fixture = new BigInt64Array([BigInt(0), BigInt(1), BigInt(2)])
+  bindings.mutateI64Array(fixture)
+  t.deepEqual(fixture[0], BigInt('9223372036854775807'))
+})

test_module/src/arraybuffer.rs

@@ -1,6 +1,7 @@
+use std::f64::consts::PI;
 use std::str;
 
-use napi::{CallContext, JsArrayBuffer, JsNumber, JsObject, Result};
+use napi::{CallContext, JsArrayBuffer, JsNumber, JsObject, JsTypedArray, JsUndefined, Result};
 
 #[js_function(1)]
 pub fn get_arraybuffer_length(ctx: CallContext) -> Result<JsNumber> {
@@ -8,7 +9,63 @@ pub fn get_arraybuffer_length(ctx: CallContext) -> Result<JsNumber> {
   ctx.env.create_uint32((&buffer).len() as u32)
 }
 
+#[js_function(1)]
+pub fn mutate_uint8_array(ctx: CallContext) -> Result<JsUndefined> {
+  let mut buffer = ctx.get::<JsTypedArray>(0)?.into_value()?;
+  let buffer_mut_ref: &mut [u8] = buffer.as_mut();
+  buffer_mut_ref[0] = 42;
+  ctx.env.get_undefined()
+}
+
+#[js_function(1)]
+pub fn mutate_uint16_array(ctx: CallContext) -> Result<JsUndefined> {
+  let mut buffer = ctx.get::<JsTypedArray>(0)?.into_value()?;
+  let buffer_mut_ref: &mut [u16] = buffer.as_mut();
+  buffer_mut_ref[0] = 65535;
+  ctx.env.get_undefined()
+}
+
+#[js_function(1)]
+pub fn mutate_int16_array(ctx: CallContext) -> Result<JsUndefined> {
+  let mut buffer = ctx.get::<JsTypedArray>(0)?.into_value()?;
+  let buffer_mut_ref: &mut [i16] = buffer.as_mut();
+  buffer_mut_ref[0] = 32767;
+  ctx.env.get_undefined()
+}
+
+#[js_function(1)]
+pub fn mutate_float32_array(ctx: CallContext) -> Result<JsUndefined> {
+  let mut buffer = ctx.get::<JsTypedArray>(0)?.into_value()?;
+  let buffer_mut_ref: &mut [f32] = buffer.as_mut();
+  buffer_mut_ref[0] = 3.14;
+  ctx.env.get_undefined()
+}
+
+#[js_function(1)]
+pub fn mutate_float64_array(ctx: CallContext) -> Result<JsUndefined> {
+  let mut buffer = ctx.get::<JsTypedArray>(0)?.into_value()?;
+  let buffer_mut_ref: &mut [f64] = buffer.as_mut();
+  buffer_mut_ref[0] = PI;
+  ctx.env.get_undefined()
+}
+
+#[js_function(1)]
+#[cfg(feature = "latest")]
+pub fn mutate_i64_array(ctx: CallContext) -> Result<JsUndefined> {
+  let mut buffer = ctx.get::<JsTypedArray>(0)?.into_value()?;
+  let buffer_mut_ref: &mut [i64] = buffer.as_mut();
+  buffer_mut_ref[0] = 9223372036854775807;
+  ctx.env.get_undefined()
+}
+
 pub fn register_js(exports: &mut JsObject) -> Result<()> {
   exports.create_named_method("getArraybufferLength", get_arraybuffer_length)?;
+  exports.create_named_method("mutateUint8Array", mutate_uint8_array)?;
+  exports.create_named_method("mutateUint16Array", mutate_uint16_array)?;
+  exports.create_named_method("mutateInt16Array", mutate_int16_array)?;
+  exports.create_named_method("mutateFloat32Array", mutate_float32_array)?;
+  exports.create_named_method("mutateFloat64Array", mutate_float64_array)?;
+  #[cfg(feature = "latest")]
+  exports.create_named_method("mutateI64Array", mutate_i64_array)?;
   Ok(())
 }