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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
//! This module implements structured cloning, as defined by [HTML]
//! (https://html.spec.whatwg.org/multipage/#safe-passing-of-structured-data).
use dom::bindings::error::{Error, Fallible};
use dom::bindings::global::GlobalRef;
use js::jsapi::{HandleValue, MutableHandleValue};
use js::jsapi::{JSContext, JS_ReadStructuredClone, JS_STRUCTURED_CLONE_VERSION};
use js::jsapi::{JS_ClearPendingException, JS_WriteStructuredClone};
use libc::size_t;
use script_traits::DOMMessage;
use std::ptr;
use std::slice;
/// A buffer for a structured clone.
pub struct StructuredCloneData {
data: *mut u64,
nbytes: size_t,
}
impl StructuredCloneData {
/// Writes a structured clone. Returns a `DataClone` error if that fails.
pub fn write(cx: *mut JSContext, message: HandleValue) -> Fallible<StructuredCloneData> {
let mut data = ptr::null_mut();
let mut nbytes = 0;
let result = unsafe {
JS_WriteStructuredClone(cx,
message,
&mut data,
&mut nbytes,
ptr::null(),
ptr::null_mut(),
HandleValue::undefined())
};
if !result {
unsafe {
JS_ClearPendingException(cx);
}
return Err(Error::DataClone);
}
Ok(StructuredCloneData {
data: data,
nbytes: nbytes,
})
}
/// Converts a StructuredCloneData to Vec<u8> for inter-thread sharing
pub fn move_to_arraybuffer(self) -> DOMMessage {
unsafe {
DOMMessage(slice::from_raw_parts(self.data as *mut u8, self.nbytes).to_vec())
}
}
/// Converts back to StructuredCloneData
pub fn make_structured_clone(data: DOMMessage) -> StructuredCloneData {
let DOMMessage(mut data) = data;
let nbytes = data.len();
let data = data.as_mut_ptr() as *mut u64;
StructuredCloneData {
data: data,
nbytes: nbytes
}
}
/// Reads a structured clone.
///
/// Panics if `JS_ReadStructuredClone` fails.
pub fn read(self, global: GlobalRef, rval: MutableHandleValue) {
unsafe {
assert!(JS_ReadStructuredClone(global.get_cx(),
self.data,
self.nbytes,
JS_STRUCTURED_CLONE_VERSION,
rval,
ptr::null(),
ptr::null_mut()));
}
}
}
unsafe impl Send for StructuredCloneData {}
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