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conversion: Extrapolate array_buffer_view_data

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And use it instead of the raw jsapi calls.
This commit is contained in:
Emilio Cobos Álvarez 2016-01-04 14:58:57 +01:00
parent 4d32444bf7
commit 9ad49c8aa1
4 changed files with 76 additions and 49 deletions
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32
components/script/dom/bindings/conversions.rs
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@ -48,11 +48,12 @@ use js::jsapi::{JSClass, JSContext, JSObject, MutableHandleValue};
use js::jsapi::{JS_GetLatin1StringCharsAndLength, JS_GetReservedSlot};
use js::jsapi::{JS_GetTwoByteStringCharsAndLength, JS_NewStringCopyN};
use js::jsapi::{JS_StringHasLatin1Chars, JS_WrapValue};
use js::jsapi::{JS_GetObjectAsArrayBufferView};
use js::jsval::{ObjectValue, StringValue};
use js::rust::ToString;
use libc;
use num::Float;
use std::{ptr, slice};
use std::{ptr, mem, slice};
use util::str::DOMString;
pub use util::str::{StringificationBehavior, jsstring_to_str};
@ -335,3 +336,32 @@ impl<T: Reflectable> ToJSValConvertible for Root<T> {
self.reflector().to_jsval(cx, rval);
}
}
/// A JS ArrayBufferView contents can only be viewed as the types marked with this trait
pub unsafe trait ArrayBufferViewContents: Clone {}
unsafe impl ArrayBufferViewContents for u8 {}
unsafe impl ArrayBufferViewContents for i8 {}
unsafe impl ArrayBufferViewContents for u16 {}
unsafe impl ArrayBufferViewContents for i16 {}
unsafe impl ArrayBufferViewContents for u32 {}
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
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();
let ret = JS_GetObjectAsArrayBufferView(abv, &mut byte_length, &mut ptr);
if ret.is_null() {
return None;
}
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
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())
}
}