tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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xpcom_utils.rs (3824B)

      1 /* This Source Code Form is subject to the terms of the Mozilla Public
      2 * License, v. 2.0. If a copy of the MPL was not distributed with this
      3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      4 
      5 use cstr::cstr;
      6 use nsstring::{nsACString, nsCString};
      7 use std::marker::PhantomData;
      8 use thin_vec::ThinVec;
      9 use xpcom::{
     10    get_service, getter_addrefs,
     11    interfaces::{
     12        mozILocaleService, nsICategoryEntry, nsICategoryManager, nsISimpleEnumerator, nsIXULRuntime,
     13    },
     14    RefPtr, XpCom,
     15 };
     16 
     17 pub struct IterSimpleEnumerator<T> {
     18    enumerator: RefPtr<nsISimpleEnumerator>,
     19    phantom: PhantomData<T>,
     20 }
     21 
     22 impl<T: XpCom> IterSimpleEnumerator<T> {
     23    /// Convert a `nsISimpleEnumerator` into a rust `Iterator` type.
     24    pub fn new(enumerator: RefPtr<nsISimpleEnumerator>) -> Self {
     25        IterSimpleEnumerator {
     26            enumerator,
     27            phantom: PhantomData,
     28        }
     29    }
     30 }
     31 
     32 impl<T: XpCom + 'static> Iterator for IterSimpleEnumerator<T> {
     33    type Item = RefPtr<T>;
     34 
     35    fn next(&mut self) -> Option<Self::Item> {
     36        let mut more = false;
     37        unsafe {
     38            self.enumerator
     39                .HasMoreElements(&mut more)
     40                .to_result()
     41                .ok()?
     42        }
     43        if !more {
     44            return None;
     45        }
     46 
     47        let element = getter_addrefs(|p| unsafe { self.enumerator.GetNext(p) }).ok()?;
     48        element.query_interface::<T>()
     49    }
     50 }
     51 
     52 fn process_type() -> u32 {
     53    if let Ok(appinfo) = xpcom::components::XULRuntime::service::<nsIXULRuntime>() {
     54        let mut process_type = nsIXULRuntime::PROCESS_TYPE_DEFAULT;
     55        if unsafe { appinfo.GetProcessType(&mut process_type).succeeded() } {
     56            return process_type;
     57        }
     58    }
     59    nsIXULRuntime::PROCESS_TYPE_DEFAULT
     60 }
     61 
     62 pub fn is_parent_process() -> bool {
     63    process_type() == nsIXULRuntime::PROCESS_TYPE_DEFAULT
     64 }
     65 
     66 pub fn get_packaged_locales() -> Option<ThinVec<nsCString>> {
     67    let locale_service =
     68        get_service::<mozILocaleService>(cstr!("@mozilla.org/intl/localeservice;1"))?;
     69    let mut locales = ThinVec::new();
     70    unsafe {
     71        locale_service
     72            .GetPackagedLocales(&mut locales)
     73            .to_result()
     74            .ok()?;
     75    }
     76    Some(locales)
     77 }
     78 
     79 pub fn get_app_locales() -> Option<ThinVec<nsCString>> {
     80    let locale_service =
     81        get_service::<mozILocaleService>(cstr!("@mozilla.org/intl/localeservice;1"))?;
     82    let mut locales = ThinVec::new();
     83    unsafe {
     84        locale_service
     85            .GetAppLocalesAsBCP47(&mut locales)
     86            .to_result()
     87            .ok()?;
     88    }
     89    Some(locales)
     90 }
     91 
     92 pub fn set_available_locales(locales: &ThinVec<nsCString>) {
     93    let locale_service =
     94        get_service::<mozILocaleService>(cstr!("@mozilla.org/intl/localeservice;1"))
     95            .expect("Failed to get a service.");
     96    unsafe {
     97        locale_service
     98            .SetAvailableLocales(locales)
     99            .to_result()
    100            .expect("Failed to set locales.");
    101    }
    102 }
    103 
    104 pub struct CategoryEntry {
    105    pub entry: nsCString,
    106    pub value: nsCString,
    107 }
    108 
    109 pub fn get_category_entries(category: &nsACString) -> Option<Vec<CategoryEntry>> {
    110    let category_manager =
    111        get_service::<nsICategoryManager>(cstr!("@mozilla.org/categorymanager;1"))?;
    112 
    113    let enumerator =
    114        getter_addrefs(|p| unsafe { category_manager.EnumerateCategory(category, p) }).ok()?;
    115 
    116    Some(
    117        IterSimpleEnumerator::<nsICategoryEntry>::new(enumerator)
    118            .map(|ientry| {
    119                let mut entry = nsCString::new();
    120                let mut value = nsCString::new();
    121                unsafe {
    122                    let _ = ientry.GetEntry(&mut *entry);
    123                    let _ = ientry.GetValue(&mut *value);
    124                }
    125                CategoryEntry { entry, value }
    126            })
    127            .collect(),
    128    )
    129 }