gio/auto/

buffered_input_stream.rs

// This file was generated by gir (https://github.com/gtk-rs/gir)
// from gir-files (https://github.com/gtk-rs/gir-files)
// DO NOT EDIT

use crate::{ffi, AsyncResult, Cancellable, FilterInputStream, InputStream, Seekable};
use glib::{
    prelude::*,
    signal::{connect_raw, SignalHandlerId},
    translate::*,
};
use std::{boxed::Box as Box_, pin::Pin};

glib::wrapper! {
    /// Buffered input stream implements [`FilterInputStream`][crate::FilterInputStream] and provides
    /// for buffered reads.
    ///
    /// By default, `GBufferedInputStream`'s buffer size is set at 4 kilobytes.
    ///
    /// To create a buffered input stream, use [`new()`][Self::new()],
    /// or [`new_sized()`][Self::new_sized()] to specify the buffer's size at
    /// construction.
    ///
    /// To get the size of a buffer within a buffered input stream, use
    /// [`BufferedInputStreamExt::buffer_size()`][crate::prelude::BufferedInputStreamExt::buffer_size()]. To change the size of a
    /// buffered input stream's buffer, use [`BufferedInputStreamExt::set_buffer_size()`][crate::prelude::BufferedInputStreamExt::set_buffer_size()].
    /// Note that the buffer's size cannot be reduced below the size of the data within the buffer.
    ///
    /// ## Properties
    ///
    ///
    /// #### `buffer-size`
    ///  The size of the backend buffer, in bytes.
    ///
    /// Readable | Writeable | Construct
    /// <details><summary><h4>FilterInputStream</h4></summary>
    ///
    ///
    /// #### `base-stream`
    ///  The underlying base stream on which the I/O ops will be done.
    ///
    /// Readable | Writeable | Construct Only
    ///
    ///
    /// #### `close-base-stream`
    ///  Whether the base stream should be closed when the filter stream is closed.
    ///
    /// Readable | Writeable | Construct
    /// </details>
    ///
    /// # Implements
    ///
    /// [`BufferedInputStreamExt`][trait@crate::prelude::BufferedInputStreamExt], [`FilterInputStreamExt`][trait@crate::prelude::FilterInputStreamExt], [`InputStreamExt`][trait@crate::prelude::InputStreamExt], [`trait@glib::ObjectExt`], [`SeekableExt`][trait@crate::prelude::SeekableExt], [`InputStreamExtManual`][trait@crate::prelude::InputStreamExtManual]
    #[doc(alias = "GBufferedInputStream")]
    pub struct BufferedInputStream(Object<ffi::GBufferedInputStream, ffi::GBufferedInputStreamClass>) @extends FilterInputStream, InputStream, @implements Seekable;

    match fn {
        type_ => || ffi::g_buffered_input_stream_get_type(),
    }
}

impl BufferedInputStream {
    pub const NONE: Option<&'static BufferedInputStream> = None;

    /// Creates a new [`InputStream`][crate::InputStream] from the given @base_stream, with
    /// a buffer set to the default size (4 kilobytes).
    /// ## `base_stream`
    /// a [`InputStream`][crate::InputStream]
    ///
    /// # Returns
    ///
    /// a [`InputStream`][crate::InputStream] for the given @base_stream.
    #[doc(alias = "g_buffered_input_stream_new")]
    pub fn new(base_stream: &impl IsA<InputStream>) -> BufferedInputStream {
        unsafe {
            InputStream::from_glib_full(ffi::g_buffered_input_stream_new(
                base_stream.as_ref().to_glib_none().0,
            ))
            .unsafe_cast()
        }
    }

    /// Creates a new [`BufferedInputStream`][crate::BufferedInputStream] from the given @base_stream,
    /// with a buffer set to @size.
    /// ## `base_stream`
    /// a [`InputStream`][crate::InputStream]
    /// ## `size`
    /// a #gsize
    ///
    /// # Returns
    ///
    /// a [`InputStream`][crate::InputStream].
    #[doc(alias = "g_buffered_input_stream_new_sized")]
    pub fn new_sized(base_stream: &impl IsA<InputStream>, size: usize) -> BufferedInputStream {
        unsafe {
            InputStream::from_glib_full(ffi::g_buffered_input_stream_new_sized(
                base_stream.as_ref().to_glib_none().0,
                size,
            ))
            .unsafe_cast()
        }
    }

    // rustdoc-stripper-ignore-next
    /// Creates a new builder-pattern struct instance to construct [`BufferedInputStream`] objects.
    ///
    /// This method returns an instance of [`BufferedInputStreamBuilder`](crate::builders::BufferedInputStreamBuilder) which can be used to create [`BufferedInputStream`] objects.
    pub fn builder() -> BufferedInputStreamBuilder {
        BufferedInputStreamBuilder::new()
    }
}

impl Default for BufferedInputStream {
    fn default() -> Self {
        glib::object::Object::new::<Self>()
    }
}

// rustdoc-stripper-ignore-next
/// A [builder-pattern] type to construct [`BufferedInputStream`] objects.
///
/// [builder-pattern]: https://doc.rust-lang.org/1.0.0/style/ownership/builders.html
#[must_use = "The builder must be built to be used"]
pub struct BufferedInputStreamBuilder {
    builder: glib::object::ObjectBuilder<'static, BufferedInputStream>,
}

impl BufferedInputStreamBuilder {
    fn new() -> Self {
        Self {
            builder: glib::object::Object::builder(),
        }
    }

    /// The size of the backend buffer, in bytes.
    pub fn buffer_size(self, buffer_size: u32) -> Self {
        Self {
            builder: self.builder.property("buffer-size", buffer_size),
        }
    }

    /// The underlying base stream on which the I/O ops will be done.
    pub fn base_stream(self, base_stream: &impl IsA<InputStream>) -> Self {
        Self {
            builder: self
                .builder
                .property("base-stream", base_stream.clone().upcast()),
        }
    }

    /// Whether the base stream should be closed when the filter stream is closed.
    pub fn close_base_stream(self, close_base_stream: bool) -> Self {
        Self {
            builder: self
                .builder
                .property("close-base-stream", close_base_stream),
        }
    }

    // rustdoc-stripper-ignore-next
    /// Build the [`BufferedInputStream`].
    #[must_use = "Building the object from the builder is usually expensive and is not expected to have side effects"]
    pub fn build(self) -> BufferedInputStream {
        self.builder.build()
    }
}

/// Trait containing all [`struct@BufferedInputStream`] methods.
///
/// # Implementors
///
/// [`BufferedInputStream`][struct@crate::BufferedInputStream], [`DataInputStream`][struct@crate::DataInputStream]
pub trait BufferedInputStreamExt: IsA<BufferedInputStream> + 'static {
    /// Tries to read @count bytes from the stream into the buffer.
    /// Will block during this read.
    ///
    /// If @count is zero, returns zero and does nothing. A value of @count
    /// larger than `G_MAXSSIZE` will cause a
    /// [error@Gio.IOErrorEnum.INVALID_ARGUMENT] error.
    ///
    /// On success, the number of bytes read into the buffer is returned.
    /// It is not an error if this is not the same as the requested size, as it
    /// can happen e.g. near the end of a file. Zero is returned on end of file
    /// (or if @count is zero),  but never otherwise.
    ///
    /// If @count is -1 then the attempted read size is equal to the number of
    /// bytes that are required to fill the buffer.
    ///
    /// If @cancellable is not `NULL`, then the operation can be cancelled by
    /// triggering the cancellable object from another thread. If the operation
    /// was cancelled, the error [error@Gio.IOErrorEnum.CANCELLED] will be returned.
    /// If an operation was partially finished when the operation was cancelled the
    /// partial result will be returned, without an error.
    ///
    /// On error `-1` is returned and @error is set accordingly.
    ///
    /// For the asynchronous, non-blocking, version of this function, see
    /// [`fill_async()`][Self::fill_async()].
    /// ## `count`
    /// the number of bytes that will be read from the stream
    /// ## `cancellable`
    /// optional [`Cancellable`][crate::Cancellable] object, `NULL` to ignore
    ///
    /// # Returns
    ///
    /// the number of bytes read into @self's buffer, up to @count,
    ///     or `-1` on error.
    #[doc(alias = "g_buffered_input_stream_fill")]
    fn fill(
        &self,
        count: isize,
        cancellable: Option<&impl IsA<Cancellable>>,
    ) -> Result<isize, glib::Error> {
        unsafe {
            let mut error = std::ptr::null_mut();
            let ret = ffi::g_buffered_input_stream_fill(
                self.as_ref().to_glib_none().0,
                count,
                cancellable.map(|p| p.as_ref()).to_glib_none().0,
                &mut error,
            );
            if error.is_null() {
                Ok(ret)
            } else {
                Err(from_glib_full(error))
            }
        }
    }

    /// Reads data into @self's buffer asynchronously, up to @count size.
    /// @io_priority can be used to prioritize reads. For the synchronous
    /// version of this function, see [`fill()`][Self::fill()].
    ///
    /// If @count is `-1` then the attempted read size is equal to the number
    /// of bytes that are required to fill the buffer.
    /// ## `count`
    /// the number of bytes that will be read from the stream
    /// ## `io_priority`
    /// the [I/O priority](iface.AsyncResult.html#io-priority) of the request
    /// ## `cancellable`
    /// optional [`Cancellable`][crate::Cancellable] object
    /// ## `callback`
    /// a `callback::Gio::AsyncReadyCallback
    #[doc(alias = "g_buffered_input_stream_fill_async")]
    fn fill_async<P: FnOnce(Result<isize, glib::Error>) + 'static>(
        &self,
        count: isize,
        io_priority: glib::Priority,
        cancellable: Option<&impl IsA<Cancellable>>,
        callback: P,
    ) {
        let main_context = glib::MainContext::ref_thread_default();
        let is_main_context_owner = main_context.is_owner();
        let has_acquired_main_context = (!is_main_context_owner)
            .then(|| main_context.acquire().ok())
            .flatten();
        assert!(
            is_main_context_owner || has_acquired_main_context.is_some(),
            "Async operations only allowed if the thread is owning the MainContext"
        );

        let user_data: Box_<glib::thread_guard::ThreadGuard<P>> =
            Box_::new(glib::thread_guard::ThreadGuard::new(callback));
        unsafe extern "C" fn fill_async_trampoline<
            P: FnOnce(Result<isize, glib::Error>) + 'static,
        >(
            _source_object: *mut glib::gobject_ffi::GObject,
            res: *mut crate::ffi::GAsyncResult,
            user_data: glib::ffi::gpointer,
        ) {
            let mut error = std::ptr::null_mut();
            let ret =
                ffi::g_buffered_input_stream_fill_finish(_source_object as *mut _, res, &mut error);
            let result = if error.is_null() {
                Ok(ret)
            } else {
                Err(from_glib_full(error))
            };
            let callback: Box_<glib::thread_guard::ThreadGuard<P>> =
                Box_::from_raw(user_data as *mut _);
            let callback: P = callback.into_inner();
            callback(result);
        }
        let callback = fill_async_trampoline::<P>;
        unsafe {
            ffi::g_buffered_input_stream_fill_async(
                self.as_ref().to_glib_none().0,
                count,
                io_priority.into_glib(),
                cancellable.map(|p| p.as_ref()).to_glib_none().0,
                Some(callback),
                Box_::into_raw(user_data) as *mut _,
            );
        }
    }

    fn fill_future(
        &self,
        count: isize,
        io_priority: glib::Priority,
    ) -> Pin<Box_<dyn std::future::Future<Output = Result<isize, glib::Error>> + 'static>> {
        Box_::pin(crate::GioFuture::new(
            self,
            move |obj, cancellable, send| {
                obj.fill_async(count, io_priority, Some(cancellable), move |res| {
                    send.resolve(res);
                });
            },
        ))
    }

    /// Gets the size of the available data within the stream.
    ///
    /// # Returns
    ///
    /// size of the available stream.
    #[doc(alias = "g_buffered_input_stream_get_available")]
    #[doc(alias = "get_available")]
    fn available(&self) -> usize {
        unsafe { ffi::g_buffered_input_stream_get_available(self.as_ref().to_glib_none().0) }
    }

    /// Gets the size of the input buffer.
    ///
    /// # Returns
    ///
    /// the current buffer size.
    #[doc(alias = "g_buffered_input_stream_get_buffer_size")]
    #[doc(alias = "get_buffer_size")]
    #[doc(alias = "buffer-size")]
    fn buffer_size(&self) -> usize {
        unsafe { ffi::g_buffered_input_stream_get_buffer_size(self.as_ref().to_glib_none().0) }
    }

    /// Returns the buffer with the currently available bytes. The returned
    /// buffer must not be modified and will become invalid when reading from
    /// the stream or filling the buffer.
    ///
    /// # Returns
    ///
    ///
    ///          read-only buffer
    #[doc(alias = "g_buffered_input_stream_peek_buffer")]
    fn peek_buffer(&self) -> Vec<u8> {
        unsafe {
            let mut count = std::mem::MaybeUninit::uninit();
            let ret = FromGlibContainer::from_glib_none_num(
                ffi::g_buffered_input_stream_peek_buffer(
                    self.as_ref().to_glib_none().0,
                    count.as_mut_ptr(),
                ),
                count.assume_init() as _,
            );
            ret
        }
    }

    /// Tries to read a single byte from the stream or the buffer. Will block
    /// during this read.
    ///
    /// On success, the byte read from the stream is returned. On end of stream
    /// `-1` is returned but it's not an exceptional error and @error is not set.
    ///
    /// If @cancellable is not `NULL`, then the operation can be cancelled by
    /// triggering the cancellable object from another thread. If the operation
    /// was cancelled, the error [error@Gio.IOErrorEnum.CANCELLED] will be returned.
    /// If an operation was partially finished when the operation was cancelled the
    /// partial result will be returned, without an error.
    ///
    /// On error `-1` is returned and @error is set accordingly.
    /// ## `cancellable`
    /// optional [`Cancellable`][crate::Cancellable] object, `NULL` to ignore
    ///
    /// # Returns
    ///
    /// the byte read from the @self, or `-1` on end of stream or error.
    #[doc(alias = "g_buffered_input_stream_read_byte")]
    fn read_byte(&self, cancellable: Option<&impl IsA<Cancellable>>) -> Result<i32, glib::Error> {
        unsafe {
            let mut error = std::ptr::null_mut();
            let ret = ffi::g_buffered_input_stream_read_byte(
                self.as_ref().to_glib_none().0,
                cancellable.map(|p| p.as_ref()).to_glib_none().0,
                &mut error,
            );
            if error.is_null() {
                Ok(ret)
            } else {
                Err(from_glib_full(error))
            }
        }
    }

    /// Sets the size of the internal buffer of @self to @size, or to the
    /// size of the contents of the buffer. The buffer can never be resized
    /// smaller than its current contents.
    /// ## `size`
    /// a #gsize
    #[doc(alias = "g_buffered_input_stream_set_buffer_size")]
    #[doc(alias = "buffer-size")]
    fn set_buffer_size(&self, size: usize) {
        unsafe {
            ffi::g_buffered_input_stream_set_buffer_size(self.as_ref().to_glib_none().0, size);
        }
    }

    #[doc(alias = "buffer-size")]
    fn connect_buffer_size_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_buffer_size_trampoline<
            P: IsA<BufferedInputStream>,
            F: Fn(&P) + 'static,
        >(
            this: *mut ffi::GBufferedInputStream,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(BufferedInputStream::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::buffer-size\0".as_ptr() as *const _,
                Some(std::mem::transmute::<*const (), unsafe extern "C" fn()>(
                    notify_buffer_size_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }
}

impl<O: IsA<BufferedInputStream>> BufferedInputStreamExt for O {}