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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/. */
//! Nicer, Rust-y APIs for structured cloning.
use glue;
use jsapi;
use rust::Runtime;
use std::ptr;
/// An RAII owned buffer for structured cloning into and out of.
pub struct StructuredCloneBuffer {
raw: *mut jsapi::JSAutoStructuredCloneBuffer,
}
impl StructuredCloneBuffer {
/// Construct a new `StructuredCloneBuffer`.
///
/// # Panics
///
/// Panics if the underlying JSAPI calls fail.
pub fn new(
scope: jsapi::JS::StructuredCloneScope,
callbacks: &jsapi::JSStructuredCloneCallbacks,
) -> StructuredCloneBuffer {
let raw = unsafe { glue::NewJSAutoStructuredCloneBuffer(scope, callbacks) };
assert!(!raw.is_null());
StructuredCloneBuffer { raw: raw }
}
/// Get the raw `*mut JSStructuredCloneData` owned by this buffer.
pub fn data(&self) -> *mut jsapi::JSStructuredCloneData {
unsafe { &mut (*self.raw).data_ }
}
/// Copy this buffer's data into a vec.
pub fn copy_to_vec(&self) -> Vec<u8> {
let len = unsafe { glue::GetLengthOfJSStructuredCloneData(self.data()) };
let mut vec = Vec::with_capacity(len);
unsafe {
glue::CopyJSStructuredCloneData(self.data(), vec.as_mut_ptr());
}
vec
}
/// Read a JS value out of this buffer.
pub fn read(
&mut self,
vp: jsapi::JS::MutableHandleValue,
callbacks: &jsapi::JSStructuredCloneCallbacks,
) -> Result<(), ()> {
if unsafe {
(*self.raw).read(
Runtime::get(),
vp,
&jsapi::JS::CloneDataPolicy {
allowIntraClusterClonableSharedObjects_: false,
allowSharedMemoryObjects_: false,
},
callbacks,
ptr::null_mut(),
)
} {
Ok(())
} else {
Err(())
}
}
/// Write a JS value into this buffer.
pub fn write(
&mut self,
v: jsapi::JS::HandleValue,
callbacks: &jsapi::JSStructuredCloneCallbacks,
) -> Result<(), ()> {
if unsafe { (*self.raw).write(Runtime::get(), v, callbacks, ptr::null_mut()) } {
Ok(())
} else {
Err(())
}
}
/// Copy the given slice into this buffer.
pub fn write_bytes(&mut self, bytes: &[u8]) -> Result<(), ()> {
let len = bytes.len();
let src = bytes.as_ptr();
if unsafe { glue::WriteBytesToJSStructuredCloneData(src, len, self.data()) } {
Ok(())
} else {
Err(())
}
}
}
impl Drop for StructuredCloneBuffer {
fn drop(&mut self) {
unsafe {
glue::DeleteJSAutoStructuredCloneBuffer(self.raw);
}
}
}
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