@ -7,7 +7,7 @@
//! [spec]: https://tc39.es/ecma262/#sec-dataview-objects
//! [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView
use std ::mem ;
use std ::{ mem , sync ::atomic ::Ordering } ;
use crate ::{
builtins ::BuiltInObject ,
@ -27,7 +27,7 @@ use bytemuck::{bytes_of, bytes_of_mut};
use super ::{
array_buffer ::{
utils ::{ memcpy , SliceRef , SliceRefMut } ,
utils ::{ memcpy , BytesConstPtr , BytesMutPtr } ,
BufferObject ,
} ,
typed_array ::{ self , TypedArrayElement } ,
@ -38,10 +38,61 @@ use super::{
#[ derive(Debug, Clone, Trace, Finalize, JsData) ]
pub struct DataView {
pub ( crate ) viewed_array_buffer : BufferObject ,
pub ( crate ) byte_length : u64 ,
pub ( crate ) byte_length : Option < u64 > ,
pub ( crate ) byte_offset : u64 ,
}
impl DataView {
/// Abstract operation [`GetViewByteLength ( viewRecord )`][spec].
///
/// [spec]: https://tc39.es/ecma262/#sec-getviewbytelength
fn byte_length ( & self , buf_byte_len : usize ) -> u64 {
// 1. Assert: IsViewOutOfBounds(viewRecord) is false.
debug_assert! ( ! self . is_out_of_bounds ( buf_byte_len ) ) ;
// 2. Let view be viewRecord.[[Object]].
// 3. If view.[[ByteLength]] is not auto, return view.[[ByteLength]].
if let Some ( byte_length ) = self . byte_length {
return byte_length ;
}
// 4. Assert: IsFixedLengthArrayBuffer(view.[[ViewedArrayBuffer]]) is false.
// 5. Let byteOffset be view.[[ByteOffset]].
// 6. Let byteLength be viewRecord.[[CachedBufferByteLength]].
// 7. Assert: byteLength is not detached.
// 8. Return byteLength - byteOffset.
buf_byte_len as u64 - self . byte_offset
}
/// Abstract operation [`IsViewOutOfBounds ( viewRecord )`][spec].
///
/// [spec]: https://tc39.es/ecma262/#sec-isviewoutofbounds
fn is_out_of_bounds ( & self , buf_byte_len : usize ) -> bool {
let buf_byte_len = buf_byte_len as u64 ;
// 1. Let view be viewRecord.[[Object]].
// 2. Let bufferByteLength be viewRecord.[[CachedBufferByteLength]].
// 3. Assert: IsDetachedBuffer(view.[[ViewedArrayBuffer]]) is true if and only if bufferByteLength is detached.
// 4. If bufferByteLength is detached, return true.
// handled by the caller
// 5. Let byteOffsetStart be view.[[ByteOffset]].
// 6. If view.[[ByteLength]] is auto, then
// a. Let byteOffsetEnd be bufferByteLength.
// 7. Else,
// a. Let byteOffsetEnd be byteOffsetStart + view.[[ByteLength]].
let byte_offset_end = self
. byte_length
. map_or ( buf_byte_len , | byte_length | byte_length + self . byte_offset ) ;
// 8. If byteOffsetStart > bufferByteLength or byteOffsetEnd > bufferByteLength, return true.
// 9. NOTE: 0-length DataViews are not considered out-of-bounds.
// 10. Return false.
self . byte_offset > buf_byte_len | | byte_offset_end > buf_byte_len
}
}
impl IntrinsicObject for DataView {
fn init ( realm : & Realm ) {
let flag_attributes = Attribute ::CONFIGURABLE | Attribute ::NON_ENUMERABLE ;
@ -120,7 +171,7 @@ impl BuiltInConstructor for DataView {
const STANDARD_CONSTRUCTOR : fn ( & StandardConstructors ) -> & StandardConstructor =
StandardConstructors ::data_view ;
/// `25.3.2.1 DataView ( buffer [ , byteOffset [ , byteLength ] ] )`
/// `DataView ( buffer [ , byteOffset [ , byteLength ] ] )`
///
/// The `DataView` view provides a low-level interface for reading and writing multiple number
/// types in a binary `ArrayBuffer`, without having to care about the platform's endianness.
@ -136,93 +187,124 @@ impl BuiltInConstructor for DataView {
args : & [ JsValue ] ,
context : & mut Context ,
) -> JsResult < JsValue > {
let byte_length = args . get_or_undefined ( 2 ) ;
// 1. If NewTarget is undefined, throw a TypeError exception.
if new_target . is_undefined ( ) {
return Err ( JsNativeError ::typ ( )
. with_message ( "new target is undefined " )
. with_message ( "cannot call `DataView` constructor without `new` " )
. into ( ) ) ;
}
let byte_len = args . get_or_undefined ( 2 ) ;
// 2. Perform ? RequireInternalSlot(buffer, [[ArrayBufferData]]).
let buffer_obj = args
let buffer = args
. get_or_undefined ( 0 )
. as_object ( )
. and_then ( | o | o . clone ( ) . into_buffer_object ( ) . ok ( ) )
. ok_or_else ( | | JsNativeError ::typ ( ) . with_message ( "buffer must be an ArrayBuffer" ) ) ? ;
let ( offset , view_byte_length ) = {
let buffer = buffer_obj . as_buffer ( ) ;
// 3. Let offset be ? ToIndex(byteOffset).
let offset = args . get_or_undefined ( 1 ) . to_index ( context ) ? ;
let ( buf_byte_len , is_fixed_len ) = {
let buffer = buffer . as_buffer ( ) ;
// 4. If IsDetachedBuffer(buffer) is true, throw a TypeError exception.
let Some ( buffer ) = buffer . data ( ) else {
let Some ( slice ) = buffer . bytes ( Ordering ::SeqCst ) else {
return Err ( JsNativeError ::typ ( )
. with_message ( "ArrayBuffer is detached" )
. into ( ) ) ;
} ;
// 5. Let bufferByteLength be buffer.[[ArrayBufferByteLength]].
let buffer_byte_length = buffer . len ( ) as u64 ;
// 5. Let bufferByteLength be ArrayBufferByteLength(buffer, seq-cst).
let buf_len = slice . len ( ) as u64 ;
// 6. If offset > bufferByteLength, throw a RangeError exception.
if offset > buffer_byte _length {
if offset > buf_len {
return Err ( JsNativeError ::range ( )
. with_message ( "Start offset is outside the bounds of the buffer" )
. into ( ) ) ;
}
// 7. If byteLength is undefined, then
let view_byte_length = if byte_length . is_undefined ( ) {
// a. Let viewByteLength be bufferByteLength - offset.
buffer_byte_length - offset
// 7. Let bufferIsFixedLength be IsFixedLengthArrayBuffer(buffer).
( buf_len , buffer . is_fixed_len ( ) )
} ;
// 8. If byteLength is undefined, then
let view_byte_len = if byte_len . is_undefined ( ) {
// a. If bufferIsFixedLength is true, then
// i. Let viewByteLength be bufferByteLength - offset.
// b. Else,
// i. Let viewByteLength be auto.
is_fixed_len . then_some ( buf_byte_len - offset )
} else {
// 8.a. Let viewByteLength be ? ToIndex(byteLength).
let view_byte_length = byte_length . to_index ( context ) ? ;
// 8.b. If offset + viewByteLength > bufferByteLength, throw a RangeError exception.
if offset + view_byte_length > buffer_byte_length {
// 9. Else,
// a. Let viewByteLength be ? ToIndex(byteLength).
let byte_len = byte_len . to_index ( context ) ? ;
// b. If offset + viewByteLength > bufferByteLength, throw a RangeError exception.
if offset + byte_len > buf_byte_len {
return Err ( JsNativeError ::range ( )
. with_message ( "Invalid data view length" )
. into ( ) ) ;
}
view_byte_length
} ;
( offset , view_byte_length )
Some ( byte_len )
} ;
// 9. Let O be ? OrdinaryCreateFromConstructor(NewTarget, "%DataView.prototype%", « [[DataView]], [[ViewedArrayBuffer]], [[ByteLength]], [[ByteOffset]] »).
// 10. Let O be ? OrdinaryCreateFromConstructor(NewTarget, "%DataView.prototype%",
// « [[DataView]], [[ViewedArrayBuffer]], [[ByteLength]], [[ByteOffset]] »).
let prototype =
get_prototype_from_constructor ( new_target , StandardConstructors ::data_view , context ) ? ;
// 10. If IsDetachedBuffer(buffer) is true, throw a TypeError exception.
if buffer_obj . as_buffer ( ) . is_detached ( ) {
// 11. If IsDetachedBuffer(buffer) is true, throw a TypeError exception.
// 12. Set bufferByteLength to ArrayBufferByteLength(buffer, seq-cst).
let Some ( buf_byte_len ) = buffer
. as_buffer ( )
. bytes ( Ordering ::SeqCst )
. map ( | s | s . len ( ) as u64 )
else {
return Err ( JsNativeError ::typ ( )
. with_message ( "ArrayBuffer can't be detached" )
. into ( ) ) ;
} ;
// 13. If offset > bufferByteLength, throw a RangeError exception.
if offset > buf_byte_len {
return Err ( JsNativeError ::range ( )
. with_message ( "DataView offset outside of buffer array bounds" )
. into ( ) ) ;
}
// 14. If byteLength is not undefined, then
if let Some ( view_byte_len ) = view_byte_len . filter ( | _ | ! byte_len . is_undefined ( ) ) {
// a. If offset + viewByteLength > bufferByteLength, throw a RangeError exception.
if offset + view_byte_len > buf_byte_len {
return Err ( JsNativeError ::range ( )
. with_message ( "DataView offset outside of buffer array bounds" )
. into ( ) ) ;
}
}
let obj = JsObject ::from_proto_and_data_with_shared_shape (
context . root_shape ( ) ,
prototype ,
Self {
// 11. Set O.[[ViewedArrayBuffer]] to buffer.
viewed_array_buffer : buffer_obj ,
// 12. Set O.[[ByteLength]] to viewByteLength.
byte_length : view_byte_length ,
// 13. Set O.[[ByteOffset]] to offset.
// 15 . Set O.[[ViewedArrayBuffer]] to buffer.
viewed_array_buffer : buffer ,
// 16 . Set O.[[ByteLength]] to viewByteLength.
byte_length : view_byte_len ,
// 17 . Set O.[[ByteOffset]] to offset.
byte_offset : offset ,
} ,
) ;
// 14. Return O.
// 18 . Return O.
Ok ( obj . into ( ) )
}
}
impl DataView {
/// `25.3.4.1 get DataView.prototype.buffer`
/// `get DataView.prototype.buffer`
///
/// The buffer accessor property represents the `ArrayBuffer` or `SharedArrayBuffer` referenced
/// by the `DataView` at construction time.
@ -251,7 +333,7 @@ impl DataView {
Ok ( buffer . into ( ) )
}
/// `25.3.4.1 get DataView.prototype.byteLength`
/// `get DataView.prototype.byteLength`
///
/// The `byteLength` accessor property represents the length (in bytes) of the dataview.
///
@ -268,26 +350,32 @@ impl DataView {
) -> JsResult < JsValue > {
// 1. Let O be the this value.
// 2. Perform ? RequireInternalSlot(O, [[DataView]]).
// 3. Assert: O has a [[ViewedArrayBuffer]] internal slot.
let view = this
. as_object ( )
. and_then ( JsObject ::downcast_ref ::< Self > )
. ok_or_else ( | | JsNativeError ::typ ( ) . with_message ( "`this` is not a DataView" ) ) ? ;
// 3. Assert: O has a [[ViewedArrayBuffer]] internal slot.
// 4. Let buffer be O.[[ViewedArrayBuffer]].
// 4. Let viewRecord be MakeDataViewWithBufferWitnessRecord(O, seq-cst).
// 5. If IsViewOutOfBounds(viewRecord) is true, throw a TypeError exception.
let buffer = view . viewed_array_buffer . as_buffer ( ) ;
// 5. If IsDetachedBuffer(buffer) is true, throw a TypeError exception.
if buffer . is_detached ( ) {
let Some ( slice ) = buffer
. bytes ( Ordering ::SeqCst )
. filter ( | s | ! view . is_out_of_bounds ( s . len ( ) ) )
else {
return Err ( JsNativeError ::typ ( )
. with_message ( "ArrayBuffer is detached" )
. with_message ( "view out of bounds for its inner buffer " )
. into ( ) ) ;
}
// 6. Let size be O.[[ByteLength]].
let size = view . byte_length ;
} ;
// 6. Let size be GetViewByteLength(viewRecord).
let size = view . byte_length ( slice . len ( ) ) ;
// 7. Return 𝔽(size).
Ok ( size . into ( ) )
}
/// `25.3.4.1 get DataView.prototype.byteOffset`
/// `get DataView.prototype.byteOffset`
///
/// The `byteOffset` accessor property represents the offset (in bytes) of this view from the
/// start of its `ArrayBuffer` or `SharedArrayBuffer`.
@ -309,22 +397,28 @@ impl DataView {
. as_object ( )
. and_then ( JsObject ::downcast_ref ::< Self > )
. ok_or_else ( | | JsNativeError ::typ ( ) . with_message ( "`this` is not a DataView" ) ) ? ;
// 3. Assert: O has a [[ViewedArrayBuffer]] internal slot.
// 4. Let buffer be O.[[ViewedArrayBuffer]].
let buffer = view . viewed_array_buffer . as_buffer ( ) ;
// 5. If IsDetachedBuffer(buffer) is true, throw a TypeError exception.
if buffer . is_detached ( ) {
// 4. Let viewRecord be MakeDataViewWithBufferWitnessRecord(O, seq-cst).
// 5. If IsViewOutOfBounds(viewRecord) is true, throw a TypeError exception.
if buffer
. bytes ( Ordering ::SeqCst )
. filter ( | b | ! view . is_out_of_bounds ( b . len ( ) ) )
. is_none ( )
{
return Err ( JsNativeError ::typ ( )
. with_message ( "Buffer is detached" )
. with_message ( "data view is outside the bounds of its inner buffer " )
. into ( ) ) ;
}
// 6. Let offset be O.[[ByteOffset]].
let offset = view . byte_offset ;
// 7. Return 𝔽(offset).
Ok ( offset . into ( ) )
}
/// `25.3.1.1 GetViewValue ( view, requestIndex, isLittleEndian, type )`
/// `GetViewValue ( view, requestIndex, isLittleEndian, type )`
///
/// The abstract operation `GetViewValue` takes arguments view, requestIndex, `isLittleEndian`,
/// and type. It is used by functions on `DataView` instances to retrieve values from the
@ -346,48 +440,56 @@ impl DataView {
. as_object ( )
. and_then ( JsObject ::downcast_ref ::< Self > )
. ok_or_else ( | | JsNativeError ::typ ( ) . with_message ( "`this` is not a DataView" ) ) ? ;
// 3. Let getIndex be ? ToIndex(requestIndex).
let get_index = request_index . to_index ( context ) ? ;
// 4. Set isLittleEndian to ! ToBoolean(isLittleEndian).
// 4. Set isLittleEndian to ToBoolean(isLittleEndian).
let is_little_endian = is_little_endian . to_boolean ( ) ;
// 5. Let buffer be view.[[ViewedArrayBuffer]].
// 6. Let viewRecord be MakeDataViewWithBufferWitnessRecord(view, unordered).
// 7. NOTE: Bounds checking is not a synchronizing operation when view's backing buffer is a growable SharedArrayBuffer.
// 8. If IsViewOutOfBounds(viewRecord) is true, throw a TypeError exception.
let buffer = view . viewed_array_buffer . as_buffer ( ) ;
// 6. If IsDetachedBuffer(buffer) is true, throw a TypeError exception.
let Some ( data ) = buffer . data ( ) else {
let Some ( data ) = buffer
. bytes ( Ordering ::Relaxed )
. filter ( | buf | ! view . is_out_of_bounds ( buf . len ( ) ) )
else {
return Err ( JsNativeError ::typ ( )
. with_message ( "ArrayBuffer is detached " )
. with_message ( "view out of bounds for its inner buffer " )
. into ( ) ) ;
} ;
// 7 . Let viewOffset be view.[[ByteOffset]].
// 5 . Let viewOffset be view.[[ByteOffset]].
let view_offset = view . byte_offset ;
// 8. Let viewSize be view.[[ByteLength]] .
let view_size = view . byte_length ;
// 9. Let viewSize be GetViewByteLength(viewRecord) .
let view_size = view . byte_length ( data . len ( ) ) ;
// 9. Let elementSize be the Element Size value specified in Table 72 for Element Type type.
// 10. Let elementSize be the Element Size value specified in Table 71 for Element Type type.
let element_size = mem ::size_of ::< T > ( ) as u64 ;
// 10 . If getIndex + elementSize > viewSize, throw a RangeError exception.
// 11 . If getIndex + elementSize > viewSize, throw a RangeError exception.
if get_index + element_size > view_size {
return Err ( JsNativeError ::range ( )
. with_message ( "Offset is outside the bounds of the DataView" )
. into ( ) ) ;
}
// 11 . Let bufferIndex be getIndex + viewOffset.
// 12 . Let bufferIndex be getIndex + viewOffset.
let buffer_index = ( get_index + view_offset ) as usize ;
// 12. Return GetValueFromBuffer(buffer, bufferIndex, type, false, Unordered, isLittleEndian).
let src = data . subslice ( buffer_index .. ) ;
debug_assert! ( src . len ( ) > = mem ::size_of ::< T > ( ) ) ;
// 13. Return GetValueFromBuffer(view.[[ViewedArrayBuffer]], bufferIndex, type, false, unordered, isLittleEndian).
// SAFETY: All previous checks ensure the element fits in the buffer.
let value : TypedArrayElement = unsafe {
let mut value = T ::zeroed ( ) ;
memcpy (
data . subslice ( buffer_index .. ) ,
SliceRefMut ::Slice ( bytes_of_mut ( & mut value ) ) ,
src . as_ptr ( ) ,
BytesMutPtr ::Bytes ( bytes_of_mut ( & mut value ) . as_mut_ptr ( ) ) ,
mem ::size_of ::< T > ( ) ,
) ;
@ -402,7 +504,7 @@ impl DataView {
Ok ( value . into ( ) )
}
/// `25.3.4.5 DataView.prototype.getBigInt64 ( byteOffset [ , littleEndian ] )`
/// `DataView.prototype.getBigInt64 ( byteOffset [ , littleEndian ] )`
///
/// The `getBigInt64()` method gets a signed 64-bit integer (long long) at the specified byte
/// offset from the start of the `DataView`.
@ -425,7 +527,7 @@ impl DataView {
Self ::get_view_value ::< i64 > ( this , byte_offset , is_little_endian , context )
}
/// `25.3.4.6 DataView.prototype.getBigUint64 ( byteOffset [ , littleEndian ] )`
/// `DataView.prototype.getBigUint64 ( byteOffset [ , littleEndian ] )`
///
/// The `getBigUint64()` method gets an unsigned 64-bit integer (unsigned long long) at the
/// specified byte offset from the start of the `DataView`.
@ -448,7 +550,7 @@ impl DataView {
Self ::get_view_value ::< u64 > ( this , byte_offset , is_little_endian , context )
}
/// `25.3.4.7 DataView.prototype.getBigUint64 ( byteOffset [ , littleEndian ] )`
/// `DataView.prototype.getBigUint64 ( byteOffset [ , littleEndian ] )`
///
/// The `getFloat32()` method gets a signed 32-bit float (float) at the specified byte offset
/// from the start of the `DataView`.
@ -471,7 +573,7 @@ impl DataView {
Self ::get_view_value ::< f32 > ( this , byte_offset , is_little_endian , context )
}
/// `25.3.4.8 DataView.prototype.getFloat64 ( byteOffset [ , littleEndian ] )`
/// `DataView.prototype.getFloat64 ( byteOffset [ , littleEndian ] )`
///
/// The `getFloat64()` method gets a signed 64-bit float (double) at the specified byte offset
/// from the start of the `DataView`.
@ -494,7 +596,7 @@ impl DataView {
Self ::get_view_value ::< f64 > ( this , byte_offset , is_little_endian , context )
}
/// `25.3.4.9 DataView.prototype.getInt8 ( byteOffset [ , littleEndian ] )`
/// `DataView.prototype.getInt8 ( byteOffset [ , littleEndian ] )`
///
/// The `getInt8()` method gets a signed 8-bit integer (byte) at the specified byte offset
/// from the start of the `DataView`.
@ -517,7 +619,7 @@ impl DataView {
Self ::get_view_value ::< i8 > ( this , byte_offset , is_little_endian , context )
}
/// `25.3.4.10 DataView.prototype.getInt16 ( byteOffset [ , littleEndian ] )`
/// `DataView.prototype.getInt16 ( byteOffset [ , littleEndian ] )`
///
/// The `getInt16()` method gets a signed 16-bit integer (short) at the specified byte offset
/// from the start of the `DataView`.
@ -540,7 +642,7 @@ impl DataView {
Self ::get_view_value ::< i16 > ( this , byte_offset , is_little_endian , context )
}
/// `25.3.4.11 DataView.prototype.getInt32 ( byteOffset [ , littleEndian ] )`
/// `DataView.prototype.getInt32 ( byteOffset [ , littleEndian ] )`
///
/// The `getInt32()` method gets a signed 32-bit integer (long) at the specified byte offset
/// from the start of the `DataView`.
@ -563,7 +665,7 @@ impl DataView {
Self ::get_view_value ::< i32 > ( this , byte_offset , is_little_endian , context )
}
/// `25.3.4.12 DataView.prototype.getUint8 ( byteOffset [ , littleEndian ] )`
/// `DataView.prototype.getUint8 ( byteOffset [ , littleEndian ] )`
///
/// The `getUint8()` method gets an unsigned 8-bit integer (unsigned byte) at the specified
/// byte offset from the start of the `DataView`.
@ -586,7 +688,7 @@ impl DataView {
Self ::get_view_value ::< u8 > ( this , byte_offset , is_little_endian , context )
}
/// `25.3.4.13 DataView.prototype.getUint16 ( byteOffset [ , littleEndian ] )`
/// `DataView.prototype.getUint16 ( byteOffset [ , littleEndian ] )`
///
/// The `getUint16()` method gets an unsigned 16-bit integer (unsigned short) at the specified
/// byte offset from the start of the `DataView`.
@ -609,7 +711,7 @@ impl DataView {
Self ::get_view_value ::< u16 > ( this , byte_offset , is_little_endian , context )
}
/// `25.3.4.14 DataView.prototype.getUint32 ( byteOffset [ , littleEndian ] )`
/// `DataView.prototype.getUint32 ( byteOffset [ , littleEndian ] )`
///
/// The `getUint32()` method gets an unsigned 32-bit integer (unsigned long) at the specified
/// byte offset from the start of the `DataView`.
@ -632,7 +734,7 @@ impl DataView {
Self ::get_view_value ::< u32 > ( this , byte_offset , is_little_endian , context )
}
/// `25.3.1.1 SetViewValue ( view, requestIndex, isLittleEndian, type )`
/// `SetViewValue ( view, requestIndex, isLittleEndian, type )`
///
/// The abstract operation `SetViewValue` takes arguments view, requestIndex, `isLittleEndian`,
/// type, and value. It is used by functions on `DataView` instances to store values into the
@ -655,44 +757,55 @@ impl DataView {
. as_object ( )
. and_then ( JsObject ::downcast_ref ::< Self > )
. ok_or_else ( | | JsNativeError ::typ ( ) . with_message ( "`this` is not a DataView" ) ) ? ;
// 3. Let getIndex be ? ToIndex(requestIndex).
let get_index = request_index . to_index ( context ) ? ;
// 4. If ! IsBigIntElementType(type) is true, let numberValue be ? ToBigInt(value).
// 4. If IsBigIntElementType(type) is true, let numberValue be ? ToBigInt(value).
// 5. Otherwise, let numberValue be ? ToNumber(value).
let value = T ::from_js_value ( value , context ) ? ;
// 6. Set isLittleEndian to ! ToBoolean(isLittleEndian).
// 6. Set isLittleEndian to ToBoolean(isLittleEndian).
let is_little_endian = is_little_endian . to_boolean ( ) ;
// 7. Let buffer be view.[[ViewedArrayBuffer]].
// 8. Let viewRecord be MakeDataViewWithBufferWitnessRecord(view, unordered).
// 9. NOTE: Bounds checking is not a synchronizing operation when view's backing buffer is a growable SharedArrayBuffer.
// 10. If IsViewOutOfBounds(viewRecord) is true, throw a TypeError exception.
let mut buffer = view . viewed_array_buffer . as_buffer_mut ( ) ;
// 8. If IsDetachedBuffer(buffer) is true, throw a TypeError exception.
let Some ( mut data ) = buffer . data_mut ( ) else {
let Some ( mut data ) = buffer
. bytes ( Ordering ::Relaxed )
. filter ( | buf | ! view . is_out_of_bounds ( buf . len ( ) ) )
else {
return Err ( JsNativeError ::typ ( )
. with_message ( "ArrayBuffer is detached" )
. with_message ( "view out of bounds for its inner buffer " )
. into ( ) ) ;
} ;
// 9. Let viewOffset be view.[[ByteOffset]].
// 11. Let viewSize be GetViewByteLength(viewRecord).
let view_size = view . byte_length ( data . len ( ) ) ;
// 7. Let viewOffset be view.[[ByteOffset]].
let view_offset = view . byte_offset ;
// 10. Let viewSize be view.[[ByteLength]].
let view _size = view . byte_length ;
// 12. Let elementSize be the Element Size value specified in Table 71 for Element Type type .
let elem _size = mem ::size_of ::< T > ( ) ;
// 11. Let elementSize be the Element Size value specified in Table 72 for Element Type type.
// 12. If getIndex + elementSize > viewSize, throw a RangeError exception.
if get_index + mem ::size_of ::< T > ( ) as u64 > view_size {
// 13. If getIndex + elementSize > viewSize, throw a RangeError exception.
if get_index + elem_size as u64 > view_size {
return Err ( JsNativeError ::range ( )
. with_message ( "Offset is outside the bounds of DataView" )
. into ( ) ) ;
}
// 13 . Let bufferIndex be getIndex + viewOffset.
// 14 . Let bufferIndex be getIndex + viewOffset.
let buffer_index = ( get_index + view_offset ) as usize ;
// 14. Return SetValueInBuffer(buffer, bufferIndex, type, numberValue, false, Unordered, isLittleEndian).
let mut target = data . subslice_mut ( buffer_index .. ) ;
debug_assert! ( target . len ( ) > = mem ::size_of ::< T > ( ) ) ;
// 15. Perform SetValueInBuffer(view.[[ViewedArrayBuffer]], bufferIndex, type, numberValue, false, unordered, isLittleEndian).
// SAFETY: All previous checks ensure the element fits in the buffer.
unsafe {
let value = if is_little_endian {
@ -702,16 +815,17 @@ impl DataView {
} ;
memcpy (
SliceRef ::Slice ( bytes_of ( & value ) ) ,
data . subslice_mut ( buffer_index .. ) ,
BytesConstPtr ::Bytes ( bytes_of ( & value ) . as_ptr ( ) ) ,
target . as_ptr ( ) ,
mem ::size_of ::< T > ( ) ,
) ;
}
// 16. Return undefined.
Ok ( JsValue ::undefined ( ) )
}
/// `25.3.4.15 DataView.prototype.setBigInt64 ( byteOffset, value [ , littleEndian ] )`
/// `DataView.prototype.setBigInt64 ( byteOffset, value [ , littleEndian ] )`
///
/// The `setBigInt64()` method stores a signed 64-bit integer (long long) value at the
/// specified byte offset from the start of the `DataView`.
@ -735,7 +849,7 @@ impl DataView {
Self ::set_view_value ::< i64 > ( this , byte_offset , is_little_endian , value , context )
}
/// `25.3.4.16 DataView.prototype.setBigUint64 ( byteOffset, value [ , littleEndian ] )`
/// `DataView.prototype.setBigUint64 ( byteOffset, value [ , littleEndian ] )`
///
/// The `setBigUint64()` method stores an unsigned 64-bit integer (unsigned long long) value at
/// the specified byte offset from the start of the `DataView`.
@ -759,7 +873,7 @@ impl DataView {
Self ::set_view_value ::< u64 > ( this , byte_offset , is_little_endian , value , context )
}
/// `25.3.4.17 DataView.prototype.setFloat32 ( byteOffset, value [ , littleEndian ] )`
/// `DataView.prototype.setFloat32 ( byteOffset, value [ , littleEndian ] )`
///
/// The `setFloat32()` method stores a signed 32-bit float (float) value at the specified byte
/// offset from the start of the `DataView`.
@ -783,7 +897,7 @@ impl DataView {
Self ::set_view_value ::< f32 > ( this , byte_offset , is_little_endian , value , context )
}
/// `25.3.4.18 DataView.prototype.setFloat64 ( byteOffset, value [ , littleEndian ] )`
/// `DataView.prototype.setFloat64 ( byteOffset, value [ , littleEndian ] )`
///
/// The `setFloat64()` method stores a signed 64-bit float (double) value at the specified byte
/// offset from the start of the `DataView`.
@ -807,7 +921,7 @@ impl DataView {
Self ::set_view_value ::< f64 > ( this , byte_offset , is_little_endian , value , context )
}
/// `25.3.4.19 DataView.prototype.setInt8 ( byteOffset, value [ , littleEndian ] )`
/// `DataView.prototype.setInt8 ( byteOffset, value [ , littleEndian ] )`
///
/// The `setInt8()` method stores a signed 8-bit integer (byte) value at the specified byte
/// offset from the start of the `DataView`.
@ -831,7 +945,7 @@ impl DataView {
Self ::set_view_value ::< i8 > ( this , byte_offset , is_little_endian , value , context )
}
/// `25.3.4.20 DataView.prototype.setInt16 ( byteOffset, value [ , littleEndian ] )`
/// `DataView.prototype.setInt16 ( byteOffset, value [ , littleEndian ] )`
///
/// The `setInt16()` method stores a signed 16-bit integer (short) value at the specified byte
/// offset from the start of the `DataView`.
@ -855,7 +969,7 @@ impl DataView {
Self ::set_view_value ::< i16 > ( this , byte_offset , is_little_endian , value , context )
}
/// `25.3.4.21 DataView.prototype.setInt32 ( byteOffset, value [ , littleEndian ] )`
/// `DataView.prototype.setInt32 ( byteOffset, value [ , littleEndian ] )`
///
/// The `setInt32()` method stores a signed 32-bit integer (long) value at the specified byte
/// offset from the start of the `DataView`.
@ -879,7 +993,7 @@ impl DataView {
Self ::set_view_value ::< i32 > ( this , byte_offset , is_little_endian , value , context )
}
/// `25.3.4.22 DataView.prototype.setUint8 ( byteOffset, value [ , littleEndian ] )`
/// `DataView.prototype.setUint8 ( byteOffset, value [ , littleEndian ] )`
///
/// The `setUint8()` method stores an unsigned 8-bit integer (byte) value at the specified byte
/// offset from the start of the `DataView`.
@ -903,7 +1017,7 @@ impl DataView {
Self ::set_view_value ::< u8 > ( this , byte_offset , is_little_endian , value , context )
}
/// `25.3.4.23 DataView.prototype.setUint16 ( byteOffset, value [ , littleEndian ] )`
/// `DataView.prototype.setUint16 ( byteOffset, value [ , littleEndian ] )`
///
/// The `setUint16()` method stores an unsigned 16-bit integer (unsigned short) value at the
/// specified byte offset from the start of the `DataView`.
@ -927,7 +1041,7 @@ impl DataView {
Self ::set_view_value ::< u16 > ( this , byte_offset , is_little_endian , value , context )
}
/// `25.3.4.24 DataView.prototype.setUint32 ( byteOffset, value [ , littleEndian ] )`
/// `DataView.prototype.setUint32 ( byteOffset, value [ , littleEndian ] )`
///
/// The `setUint32()` method stores an unsigned 32-bit integer (unsigned long) value at the
/// specified byte offset from the start of the `DataView`.
José Julián Espina
10 months ago
committed by
GitHub