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conversions: Add a checked version to array_buffer_view_data

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This commit is contained in:
Emilio Cobos Álvarez 2016-01-04 15:18:40 +01:00
parent 9ad49c8aa1
commit 43d395a682
3 changed files with 35 additions and 12 deletions
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30
components/script/dom/bindings/conversions.rs
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@ -46,9 +46,10 @@ use js::glue::{RUST_JSID_IS_STRING, RUST_JSID_TO_STRING, UnwrapObject};
use js::jsapi::{HandleId, HandleObject, HandleValue, JS_GetClass};
use js::jsapi::{JSClass, JSContext, JSObject, MutableHandleValue};
use js::jsapi::{JS_GetLatin1StringCharsAndLength, JS_GetReservedSlot};
use js::jsapi::{JS_GetObjectAsArrayBufferView, JS_GetArrayBufferViewType};
use js::jsapi::{JS_GetTwoByteStringCharsAndLength, JS_NewStringCopyN};
use js::jsapi::{JS_StringHasLatin1Chars, JS_WrapValue};
use js::jsapi::{JS_GetObjectAsArrayBufferView};
use js::jsapi::{Type};
use js::jsval::{ObjectValue, StringValue};
use js::rust::ToString;
use libc;
@ -348,7 +349,8 @@ unsafe impl ArrayBufferViewContents for i32 {}
unsafe impl ArrayBufferViewContents for f32 {}
unsafe impl ArrayBufferViewContents for f64 {}
/// Returns a mutable slice of the Array Buffer View data, viewed as T
/// Returns a mutable slice of the Array Buffer View data, viewed as T, without checking the real
/// type of it.
pub unsafe fn array_buffer_view_data<'a, T: ArrayBufferViewContents>(abv: *mut JSObject) -> Option<&'a mut [T]> {
let mut byte_length = 0;
let mut ptr = ptr::null_mut();
@ -359,9 +361,31 @@ pub unsafe fn array_buffer_view_data<'a, T: ArrayBufferViewContents>(abv: *mut J
Some(slice::from_raw_parts_mut(ptr as *mut T, byte_length as usize / mem::size_of::<T>()))
}
/// Returns a copy of the ArrayBufferView data
/// Returns a copy of the ArrayBufferView data, viewed as T, without checking the real type of it.
pub fn array_buffer_view_to_vec<T: ArrayBufferViewContents>(abv: *mut JSObject) -> Option<Vec<T>> {
unsafe {
array_buffer_view_data(abv).map(|data| data.to_vec())
}
}
/// Returns a mutable slice of the Array Buffer View data, viewed as T, checking that the real type
/// of it is ty.
pub unsafe fn array_buffer_view_data_checked<'a, T: ArrayBufferViewContents>(abv: *mut JSObject,
ty: Type) -> Option<&'a mut [T]> {
array_buffer_view_data::<T>(abv).and_then(|data| {
let real_ty = JS_GetArrayBufferViewType(abv);
if real_ty as i32 == ty as i32 {
Some(data)
} else {
None
}
})
}
/// Returns a copy of the ArrayBufferView data, viewed as T, checking that the real type
/// of it is ty.
pub fn array_buffer_view_to_vec_checked<T: ArrayBufferViewContents>(abv: *mut JSObject, ty: Type) -> Option<Vec<T>> {
unsafe {
array_buffer_view_data_checked(abv, ty).map(|data| data.to_vec())
}
}