read_to_end.rs.html -- source

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ops

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character

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multi

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number

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sequence

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ordermap

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parking_lot

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parking_lot_core

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percent_encoding

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ppv_lite86

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proc_macro2

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proc_macro_nested

quote

ext.rs format.rs ident_fragment.rs lib.rs runtime.rs spanned.rs to_tokens.rs

rand

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rand_core

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raw_window_handle

read_color

relevant

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collect.rs lib.rs node.rs resource.rs sync.rs

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buffer

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family

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rendy_core

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cirque

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graph

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group

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mapping

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block.rs lib.rs memory.rs usage.rs util.rs utilization.rs

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same_file

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private

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ser

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export.rs integer128.rs lib.rs macros.rs

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bound.rs de.rs dummy.rs fragment.rs lib.rs pretend.rs ser.rs try.rs

serde_json

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shaderc

shaderc_sys

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slab

smallvec

smithay_client_toolkit

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keyboard

ffi.rs keysyms.rs mod.rs

pointer

mod.rs theme.rs

shell

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utils

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window

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env.rs lib.rs output.rs surface.rs

smithay_clipboard

lib.rs threaded.rs

spirv_headers

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stb_truetype

syn

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texture

thiserror

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thiserror_impl

ast.rs attr.rs expand.rs fmt.rs lib.rs prop.rs valid.rs

thread_profiler

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tracing

dispatcher.rs field.rs instrument.rs level_filters.rs lib.rs macros.rs span.rs stdlib.rs subscriber.rs

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ttf_parser

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device

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attachments_list.rs compat_atch.rs desc.rs empty.rs framebuffer.rs macros.rs mod.rs sys.rs traits.rs

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instance

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memory

pool

host_visible.rs mod.rs non_host_visible.rs pool.rs

device_memory.rs mod.rs

pipeline

query

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capabilities.rs display.rs mod.rs present_region.rs surface.rs swapchain.rs

sync

future

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event.rs fence.rs mod.rs pipeline.rs semaphore.rs

extensions.rs features.rs format.rs lib.rs sampler.rs version.rs

vulkano_shaders

codegen.rs descriptor_sets.rs entry_point.rs enums.rs lib.rs parse.rs spec_consts.rs spirv_search.rs structs.rs

walkdir

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wayland_client

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cursor.rs display.rs event_queue.rs globals.rs lib.rs proxy.rs sinks.rs

wayland_commons

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wayland_cursor

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direct.rs mod.rs native_gpu_future.rs

util

lib.rs macros.rs

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desktop.rs mod.rs unix.rs

platform_impl

linux

wayland

event_loop

mod.rs proxy.rs sink.rs state.rs

seat

keyboard

handlers.rs keymap.rs mod.rs

pointer

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text_input

handlers.rs mod.rs

touch

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window

env.rs mod.rs output.rs

x11

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x11_clipboard

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xcb

ffi

xcursor

lib.rs parser.rs

xdg

xml

use futures_core::future::Future;
use futures_core::task::{Context, Poll};
use futures_io::AsyncRead;
use std::io;
use std::pin::Pin;
use std::vec::Vec;

/// Future for the [`read_to_end`](super::AsyncReadExt::read_to_end) method.
#[derive(Debug)]
#[must_use = "futures do nothing unless you `.await` or poll them"]
pub struct ReadToEnd<'a, R: ?Sized> {
    reader: &'a mut R,
    buf: &'a mut Vec<u8>,
    start_len: usize,
}

impl<R: ?Sized + Unpin> Unpin for ReadToEnd<'_, R> {}

impl<'a, R: AsyncRead + ?Sized + Unpin> ReadToEnd<'a, R> {
    pub(super) fn new(reader: &'a mut R, buf: &'a mut Vec<u8>) -> Self {
        let start_len = buf.len();
        Self {
            reader,
            buf,
            start_len,
        }
    }
}

struct Guard<'a> { buf: &'a mut Vec<u8>, len: usize }

impl Drop for Guard<'_> {
    fn drop(&mut self) {
        unsafe { self.buf.set_len(self.len); }
    }
}

// This uses an adaptive system to extend the vector when it fills. We want to
// avoid paying to allocate and zero a huge chunk of memory if the reader only
// has 4 bytes while still making large reads if the reader does have a ton
// of data to return. Simply tacking on an extra DEFAULT_BUF_SIZE space every
// time is 4,500 times (!) slower than this if the reader has a very small
// amount of data to return.
//
// Because we're extending the buffer with uninitialized data for trusted
// readers, we need to make sure to truncate that if any of this panics.
pub(super) fn read_to_end_internal<R: AsyncRead + ?Sized>(
    mut rd: Pin<&mut R>,
    cx: &mut Context<'_>,
    buf: &mut Vec<u8>,
    start_len: usize,
) -> Poll<io::Result<usize>> {
    let mut g = Guard { len: buf.len(), buf };
    let ret;
    loop {
        if g.len == g.buf.len() {
            unsafe {
                g.buf.reserve(32);
                let capacity = g.buf.capacity();
                g.buf.set_len(capacity);
                super::initialize(&rd, &mut g.buf[g.len..]);
            }
        }

        match ready!(rd.as_mut().poll_read(cx, &mut g.buf[g.len..])) {
            Ok(0) => {
                ret = Poll::Ready(Ok(g.len - start_len));
                break;
            }
            Ok(n) => g.len += n,
            Err(e) => {
                ret = Poll::Ready(Err(e));
                break;
            }
        }
    }

    ret
}

impl<A> Future for ReadToEnd<'_, A>
    where A: AsyncRead + ?Sized + Unpin,
{
    type Output = io::Result<usize>;

    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
        let this = &mut *self;
        read_to_end_internal(Pin::new(&mut this.reader), cx, this.buf, this.start_len)
    }
}