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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::Fallible;
use dom::bindings::error::Error::DataClone;
use dom::bindings::global::GlobalRef;
use js::glue::JS_STRUCTURED_CLONE_VERSION;
use js::jsapi::JSContext;
use js::jsapi::{JS_WriteStructuredClone, JS_ClearPendingException};
use js::jsapi::JS_ReadStructuredClone;
use js::jsapi::{HandleValue, MutableHandleValue};
use libc::size_t;
use std::ptr;
/// 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 == 0 {
unsafe { JS_ClearPendingException(cx); }
return Err(DataClone);
}
Ok(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()) != 0);
}
}
}
unsafe impl Send for StructuredCloneData {}
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