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// Copyright 2017, The Gtk-rs Project Developers.
// See the COPYRIGHT file at the top-level directory of this distribution.
// Licensed under the MIT license, see the LICENSE file or <http://opensource.org/licenses/MIT>

use gio_sys;
use glib;
use glib::translate::*;
use glib_sys;
use std::mem;
use std::ptr;
use Resource;

impl Resource {
    /// Creates a GResource from a reference to the binary resource bundle.
    /// This will keep a reference to `data` while the resource lives, so
    /// the data should not be modified or freed.
    ///
    /// If you want to use this resource in the global resource namespace you need
    /// to register it with `g_resources_register`.
    ///
    /// Note: `data` must be backed by memory that is at least pointer aligned.
    /// Otherwise this function will internally create a copy of the memory since
    /// GLib 2.56, or in older versions fail and exit the process.
    ///
    /// If `data` is empty or corrupt, `ResourceError::Internal` will be returned.
    /// ## `data`
    /// A `glib::Bytes`
    ///
    /// # Returns
    ///
    /// a new `Resource`, or `None` on error
    pub fn new_from_data(data: &glib::Bytes) -> Result<Resource, glib::Error> {
        unsafe {
            let mut error = ptr::null_mut();

            // Create a copy of data if it is not pointer-aligned
            // https://bugzilla.gnome.org/show_bug.cgi?id=790030
            let mut data = data.clone();
            let data_ptr = glib_sys::g_bytes_get_data(data.to_glib_none().0, ptr::null_mut());
            if data_ptr as usize % mem::align_of::<*const u8>() != 0 {
                data = glib::Bytes::from(&*data);
            }

            let ret = gio_sys::g_resource_new_from_data(data.to_glib_none().0, &mut error);
            if error.is_null() {
                Ok(from_glib_full(ret))
            } else {
                Err(from_glib_full(error))
            }
        }
    }
}