62e8ea2732
This is a direct extract from my abandoned PR for a lint (#7546), along with some rather clumsy modifications (only on `components/script/dom/mod.rs` and `components/style/lib.rs`), because I had to sort some of the files again to make peace with tidy, which hasn't been educated about sorting yet! Source-Repo: https://github.com/servo/servo Source-Revision: a7208869f2903e36f9b2f540b55b50283d7df466
59 lines
2.0 KiB
Rust
59 lines
2.0 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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//! This module implements structured cloning, as defined by [HTML]
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//! (https://html.spec.whatwg.org/multipage/#safe-passing-of-structured-data).
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use dom::bindings::error::Error::DataClone;
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use dom::bindings::error::Fallible;
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use dom::bindings::global::GlobalRef;
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use js::glue::JS_STRUCTURED_CLONE_VERSION;
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use js::jsapi::{HandleValue, MutableHandleValue};
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use js::jsapi::{JSContext, JS_ReadStructuredClone};
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use js::jsapi::{JS_ClearPendingException, JS_WriteStructuredClone};
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use libc::size_t;
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use std::ptr;
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/// A buffer for a structured clone.
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pub struct StructuredCloneData {
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data: *mut u64,
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nbytes: size_t,
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}
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impl StructuredCloneData {
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/// Writes a structured clone. Returns a `DataClone` error if that fails.
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pub fn write(cx: *mut JSContext, message: HandleValue)
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-> Fallible<StructuredCloneData> {
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let mut data = ptr::null_mut();
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let mut nbytes = 0;
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let result = unsafe {
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JS_WriteStructuredClone(cx, message, &mut data, &mut nbytes,
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ptr::null(), ptr::null_mut(),
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HandleValue::undefined())
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};
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if result == 0 {
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unsafe { JS_ClearPendingException(cx); }
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return Err(DataClone);
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}
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Ok(StructuredCloneData {
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data: data,
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nbytes: nbytes,
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})
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}
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/// Reads a structured clone.
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///
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/// Panics if `JS_ReadStructuredClone` fails.
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pub fn read(self, global: GlobalRef, rval: MutableHandleValue) {
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unsafe {
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assert!(JS_ReadStructuredClone(
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global.get_cx(), self.data, self.nbytes,
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JS_STRUCTURED_CLONE_VERSION, rval,
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ptr::null(), ptr::null_mut()) != 0);
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}
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}
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}
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unsafe impl Send for StructuredCloneData {}
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