1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143

// Copyright 2019, 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_sys;

use glib::translate::*;
use glib::Error;
use glib::SeekType;

use glib::subclass::prelude::*;

use std::mem;

use Cancellable;
use Seekable;

pub trait SeekableImpl: ObjectImpl + Send + 'static {
    fn tell(&self, seekable: &Seekable) -> i64;
    fn can_seek(&self, seekable: &Seekable) -> bool;
    fn seek(
        &self,
        seekable: &Seekable,
        offset: i64,
        type_: SeekType,
        cancellable: Option<&Cancellable>,
    ) -> Result<(), Error>;
    fn can_truncate(&self, seekable: &Seekable) -> bool;
    fn truncate(
        &self,
        seekable: &Seekable,
        offset: i64,
        cancellable: Option<&Cancellable>,
    ) -> Result<(), Error>;
}

unsafe impl<T: ObjectSubclass + SeekableImpl> IsImplementable<T> for Seekable {
    unsafe extern "C" fn interface_init(
        iface: glib_sys::gpointer,
        _iface_data: glib_sys::gpointer,
    ) {
        let seekable_iface = &mut *(iface as *mut gio_sys::GSeekableIface);

        seekable_iface.tell = Some(seekable_tell::<T>);
        seekable_iface.can_seek = Some(seekable_can_seek::<T>);
        seekable_iface.seek = Some(seekable_seek::<T>);
        seekable_iface.can_truncate = Some(seekable_can_truncate::<T>);
        seekable_iface.truncate_fn = Some(seekable_truncate::<T>);
    }
}

unsafe extern "C" fn seekable_tell<T: ObjectSubclass>(seekable: *mut gio_sys::GSeekable) -> i64
where
    T: SeekableImpl,
{
    let instance = &*(seekable as *mut T::Instance);
    let imp = instance.get_impl();

    imp.tell(&from_glib_borrow(seekable))
}

unsafe extern "C" fn seekable_can_seek<T: ObjectSubclass>(
    seekable: *mut gio_sys::GSeekable,
) -> glib_sys::gboolean
where
    T: SeekableImpl,
{
    let instance = &*(seekable as *mut T::Instance);
    let imp = instance.get_impl();

    imp.can_seek(&from_glib_borrow(seekable)).to_glib()
}

unsafe extern "C" fn seekable_seek<T: ObjectSubclass>(
    seekable: *mut gio_sys::GSeekable,
    offset: i64,
    type_: glib_sys::GSeekType,
    cancellable: *mut gio_sys::GCancellable,
    err: *mut *mut glib_sys::GError,
) -> glib_sys::gboolean
where
    T: SeekableImpl,
{
    let instance = &*(seekable as *mut T::Instance);
    let imp = instance.get_impl();

    match imp.seek(
        &from_glib_borrow(seekable),
        offset,
        from_glib(type_),
        Option::<Cancellable>::from_glib_borrow(cancellable)
            .as_ref()
            .as_ref(),
    ) {
        Ok(()) => glib_sys::GTRUE,
        Err(e) => {
            let mut e = mem::ManuallyDrop::new(e);
            *err = e.to_glib_none_mut().0;
            glib_sys::GFALSE
        }
    }
}

unsafe extern "C" fn seekable_can_truncate<T: ObjectSubclass>(
    seekable: *mut gio_sys::GSeekable,
) -> glib_sys::gboolean
where
    T: SeekableImpl,
{
    let instance = &*(seekable as *mut T::Instance);
    let imp = instance.get_impl();

    imp.can_truncate(&from_glib_borrow(seekable)).to_glib()
}

unsafe extern "C" fn seekable_truncate<T: ObjectSubclass>(
    seekable: *mut gio_sys::GSeekable,
    offset: i64,
    cancellable: *mut gio_sys::GCancellable,
    err: *mut *mut glib_sys::GError,
) -> glib_sys::gboolean
where
    T: SeekableImpl,
{
    let instance = &*(seekable as *mut T::Instance);
    let imp = instance.get_impl();

    match imp.truncate(
        &from_glib_borrow(seekable),
        offset,
        Option::<Cancellable>::from_glib_borrow(cancellable)
            .as_ref()
            .as_ref(),
    ) {
        Ok(()) => glib_sys::GTRUE,
        Err(e) => {
            let mut e = mem::ManuallyDrop::new(e);
            *err = e.to_glib_none_mut().0;
            glib_sys::GFALSE
        }
    }
}