Revision control
Copy as Markdown
Other Tools
// Copyright 2013 The Servo Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! Core Foundation property lists
use std::mem;
use std::os::raw::c_void;
use std::ptr;
use crate::base::{CFType, TCFType, TCFTypeRef};
use crate::data::CFData;
use crate::error::CFError;
use core_foundation_sys::base::{
kCFAllocatorDefault, CFGetRetainCount, CFGetTypeID, CFIndex, CFRetain, CFShow, CFTypeID,
};
use core_foundation_sys::error::CFErrorRef;
pub use core_foundation_sys::propertylist::*;
pub fn create_with_data(
data: CFData,
options: CFPropertyListMutabilityOptions,
) -> Result<(*const c_void, CFPropertyListFormat), CFError> {
unsafe {
let mut error: CFErrorRef = ptr::null_mut();
let mut format: CFPropertyListFormat = 0;
let property_list = CFPropertyListCreateWithData(
kCFAllocatorDefault,
data.as_concrete_TypeRef(),
options,
&mut format,
&mut error,
);
if property_list.is_null() {
Err(TCFType::wrap_under_create_rule(error))
} else {
Ok((property_list, format))
}
}
}
pub fn create_data(
property_list: *const c_void,
format: CFPropertyListFormat,
) -> Result<CFData, CFError> {
unsafe {
let mut error: CFErrorRef = ptr::null_mut();
let data_ref =
CFPropertyListCreateData(kCFAllocatorDefault, property_list, format, 0, &mut error);
if data_ref.is_null() {
Err(TCFType::wrap_under_create_rule(error))
} else {
Ok(TCFType::wrap_under_create_rule(data_ref))
}
}
}
/// Trait for all subclasses of [`CFPropertyList`].
///
/// [`CFPropertyList`]: struct.CFPropertyList.html
pub trait CFPropertyListSubClass: TCFType {
/// Create an instance of the superclass type [`CFPropertyList`] for this instance.
///
/// [`CFPropertyList`]: struct.CFPropertyList.html
#[inline]
fn to_CFPropertyList(&self) -> CFPropertyList {
unsafe { CFPropertyList::wrap_under_get_rule(self.as_concrete_TypeRef().as_void_ptr()) }
}
/// Equal to [`to_CFPropertyList`], but consumes self and avoids changing the reference count.
///
/// [`to_CFPropertyList`]: #method.to_CFPropertyList
#[inline]
fn into_CFPropertyList(self) -> CFPropertyList
where
Self: Sized,
{
let reference = self.as_concrete_TypeRef().as_void_ptr();
mem::forget(self);
unsafe { CFPropertyList::wrap_under_create_rule(reference) }
}
}
impl CFPropertyListSubClass for crate::data::CFData {}
impl CFPropertyListSubClass for crate::string::CFString {}
impl CFPropertyListSubClass for crate::array::CFArray {}
impl CFPropertyListSubClass for crate::dictionary::CFDictionary {}
impl CFPropertyListSubClass for crate::date::CFDate {}
impl CFPropertyListSubClass for crate::boolean::CFBoolean {}
impl CFPropertyListSubClass for crate::number::CFNumber {}
declare_TCFType! {
/// A CFPropertyList struct. This is superclass to [`CFData`], [`CFString`], [`CFArray`],
/// [`CFDictionary`], [`CFDate`], [`CFBoolean`], and [`CFNumber`].
///
/// This superclass type does not have its own `CFTypeID`, instead each instance has the `CFTypeID`
/// of the subclass it is an instance of. Thus, this type cannot implement the [`TCFType`] trait,
/// since it cannot implement the static [`TCFType::type_id()`] method.
///
/// [`CFData`]: ../data/struct.CFData.html
/// [`CFString`]: ../string/struct.CFString.html
/// [`CFArray`]: ../array/struct.CFArray.html
/// [`CFDictionary`]: ../dictionary/struct.CFDictionary.html
/// [`CFDate`]: ../date/struct.CFDate.html
/// [`CFBoolean`]: ../boolean/struct.CFBoolean.html
/// [`CFNumber`]: ../number/struct.CFNumber.html
/// [`TCFType`]: ../base/trait.TCFType.html
/// [`TCFType::type_id()`]: ../base/trait.TCFType.html#method.type_of
CFPropertyList, CFPropertyListRef
}
impl_CFTypeDescription!(CFPropertyList);
impl CFPropertyList {
#[inline]
pub fn as_concrete_TypeRef(&self) -> CFPropertyListRef {
self.0
}
#[inline]
pub unsafe fn wrap_under_get_rule(reference: CFPropertyListRef) -> CFPropertyList {
assert!(!reference.is_null(), "Attempted to create a NULL object.");
let reference = CFRetain(reference);
CFPropertyList(reference)
}
#[inline]
pub fn as_CFType(&self) -> CFType {
unsafe { CFType::wrap_under_get_rule(self.as_CFTypeRef()) }
}
#[inline]
pub fn into_CFType(self) -> CFType
where
Self: Sized,
{
let reference = self.as_CFTypeRef();
mem::forget(self);
unsafe { TCFType::wrap_under_create_rule(reference) }
}
#[inline]
pub fn as_CFTypeRef(&self) -> ::core_foundation_sys::base::CFTypeRef {
self.as_concrete_TypeRef()
}
#[inline]
pub unsafe fn wrap_under_create_rule(obj: CFPropertyListRef) -> CFPropertyList {
assert!(!obj.is_null(), "Attempted to create a NULL object.");
CFPropertyList(obj)
}
/// Returns the reference count of the object. It is unwise to do anything other than test
/// whether the return value of this method is greater than zero.
#[inline]
pub fn retain_count(&self) -> CFIndex {
unsafe { CFGetRetainCount(self.as_CFTypeRef()) }
}
/// Returns the type ID of this object. Will be one of `CFData`, `CFString`, `CFArray`,
/// `CFDictionary`, `CFDate`, `CFBoolean`, or `CFNumber`.
#[inline]
pub fn type_of(&self) -> CFTypeID {
unsafe { CFGetTypeID(self.as_CFTypeRef()) }
}
/// Writes a debugging version of this object on standard error.
pub fn show(&self) {
unsafe { CFShow(self.as_CFTypeRef()) }
}
/// Returns `true` if this value is an instance of another type.
#[inline]
pub fn instance_of<OtherCFType: TCFType>(&self) -> bool {
self.type_of() == OtherCFType::type_id()
}
}
impl Clone for CFPropertyList {
#[inline]
fn clone(&self) -> CFPropertyList {
unsafe { CFPropertyList::wrap_under_get_rule(self.0) }
}
}
impl PartialEq for CFPropertyList {
#[inline]
fn eq(&self, other: &CFPropertyList) -> bool {
self.as_CFType().eq(&other.as_CFType())
}
}
impl Eq for CFPropertyList {}
impl CFPropertyList {
/// Try to downcast the [`CFPropertyList`] to a subclass. Checking if the instance is the
/// correct subclass happens at runtime and `None` is returned if it is not the correct type.
/// Works similar to [`Box::downcast`] and [`CFType::downcast`].
///
/// # Examples
///
/// ```
/// # use core_foundation::string::CFString;
/// # use core_foundation::propertylist::{CFPropertyList, CFPropertyListSubClass};
/// #
/// // Create a string.
/// let string: CFString = CFString::from_static_string("FooBar");
/// // Cast it up to a property list.
/// let propertylist: CFPropertyList = string.to_CFPropertyList();
/// // Cast it down again.
/// assert_eq!(propertylist.downcast::<CFString>().unwrap().to_string(), "FooBar");
/// ```
///
/// [`CFPropertyList`]: struct.CFPropertyList.html
pub fn downcast<T: CFPropertyListSubClass>(&self) -> Option<T> {
if self.instance_of::<T>() {
unsafe {
let subclass_ref = T::Ref::from_void_ptr(self.0);
Some(T::wrap_under_get_rule(subclass_ref))
}
} else {
None
}
}
/// Similar to [`downcast`], but consumes self and can thus avoid touching the retain count.
///
/// [`downcast`]: #method.downcast
pub fn downcast_into<T: CFPropertyListSubClass>(self) -> Option<T> {
if self.instance_of::<T>() {
unsafe {
let subclass_ref = T::Ref::from_void_ptr(self.0);
mem::forget(self);
Some(T::wrap_under_create_rule(subclass_ref))
}
} else {
None
}
}
}
#[cfg(test)]
pub mod test {
use super::*;
use crate::boolean::CFBoolean;
use crate::string::CFString;
#[test]
fn test_property_list_serialization() {
use super::*;
use crate::base::{CFEqual, TCFType};
use crate::boolean::CFBoolean;
use crate::dictionary::CFDictionary;
use crate::number::CFNumber;
use crate::string::CFString;
let bar = CFString::from_static_string("Bar");
let baz = CFString::from_static_string("Baz");
let boo = CFString::from_static_string("Boo");
let foo = CFString::from_static_string("Foo");
let tru = CFBoolean::true_value();
let n42 = CFNumber::from(1i64 << 33);
let dict1 = CFDictionary::from_CFType_pairs(&[
(bar.as_CFType(), boo.as_CFType()),
(baz.as_CFType(), tru.as_CFType()),
(foo.as_CFType(), n42.as_CFType()),
]);
let data = create_data(dict1.as_CFTypeRef(), kCFPropertyListXMLFormat_v1_0).unwrap();
let (dict2, _) = create_with_data(data, kCFPropertyListImmutable).unwrap();
unsafe {
assert_eq!(CFEqual(dict1.as_CFTypeRef(), dict2), 1);
}
}
#[test]
fn to_propertylist_retain_count() {
let string = CFString::from_static_string("alongerstring");
assert_eq!(string.retain_count(), 1);
let propertylist = string.to_CFPropertyList();
assert_eq!(string.retain_count(), 2);
assert_eq!(propertylist.retain_count(), 2);
mem::drop(string);
assert_eq!(propertylist.retain_count(), 1);
}
#[test]
fn downcast_string() {
let propertylist = CFString::from_static_string("Bar").to_CFPropertyList();
assert_eq!(
propertylist.downcast::<CFString>().unwrap().to_string(),
"Bar"
);
assert!(propertylist.downcast::<CFBoolean>().is_none());
}
#[test]
fn downcast_boolean() {
let propertylist = CFBoolean::true_value().to_CFPropertyList();
assert!(propertylist.downcast::<CFBoolean>().is_some());
assert!(propertylist.downcast::<CFString>().is_none());
}
#[test]
fn downcast_into_fail() {
let string = CFString::from_static_string("alongerstring");
let propertylist = string.to_CFPropertyList();
assert_eq!(string.retain_count(), 2);
assert!(propertylist.downcast_into::<CFBoolean>().is_none());
assert_eq!(string.retain_count(), 1);
}
#[test]
fn downcast_into() {
let string = CFString::from_static_string("alongerstring");
let propertylist = string.to_CFPropertyList();
assert_eq!(string.retain_count(), 2);
let string2 = propertylist.downcast_into::<CFString>().unwrap();
assert_eq!(string2.to_string(), "alongerstring");
assert_eq!(string2.retain_count(), 2);
}
}