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| </pre></div><pre class="rust"><code><span class="comment">// Copyright (C) 2020, Cloudflare, Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright notice, |
| // this list of conditions and the following disclaimer. |
| // |
| // * Redistributions in binary form must reproduce the above copyright |
| // notice, this list of conditions and the following disclaimer in the |
| // documentation and/or other materials provided with the distribution. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
| // IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| // THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| // PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR |
| // CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| // EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| </span><span class="kw">use </span><span class="kw">crate</span>::Error; |
| <span class="kw">use </span><span class="kw">crate</span>::Result; |
| |
| <span class="kw">use </span>std::collections::VecDeque; |
| |
| <span class="doccomment">/// Keeps track of DATAGRAM frames. |
| </span><span class="attr">#[derive(Default)] |
| </span><span class="kw">pub struct </span>DatagramQueue { |
| queue: <span class="prelude-ty">Option</span><VecDeque<Vec<u8>>>, |
| queue_max_len: usize, |
| queue_bytes_size: usize, |
| } |
| |
| <span class="kw">impl </span>DatagramQueue { |
| <span class="kw">pub fn </span>new(queue_max_len: usize) -> <span class="self">Self </span>{ |
| DatagramQueue { |
| queue: <span class="prelude-val">None</span>, |
| queue_bytes_size: <span class="number">0</span>, |
| queue_max_len, |
| } |
| } |
| |
| <span class="kw">pub fn </span>push(<span class="kw-2">&mut </span><span class="self">self</span>, data: Vec<u8>) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">if </span><span class="self">self</span>.is_full() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::Done); |
| } |
| |
| <span class="self">self</span>.queue_bytes_size += data.len(); |
| <span class="self">self</span>.queue |
| .get_or_insert_with(Default::default) |
| .push_back(data); |
| |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="kw">pub fn </span>peek_front_len(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="self">self</span>.queue.as_ref().and_then(|q| q.front().map(|d| d.len())) |
| } |
| |
| <span class="kw">pub fn </span>peek_front_bytes(<span class="kw-2">&</span><span class="self">self</span>, buf: <span class="kw-2">&mut </span>[u8], len: usize) -> <span class="prelude-ty">Result</span><usize> { |
| <span class="kw">match </span><span class="self">self</span>.queue.as_ref().and_then(|q| q.front()) { |
| <span class="prelude-val">Some</span>(d) => { |
| <span class="kw">let </span>len = std::cmp::min(len, d.len()); |
| <span class="kw">if </span>buf.len() < len { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::BufferTooShort); |
| } |
| |
| buf[..len].copy_from_slice(<span class="kw-2">&</span>d[..len]); |
| <span class="prelude-val">Ok</span>(len) |
| }, |
| |
| <span class="prelude-val">None </span>=> <span class="prelude-val">Err</span>(Error::Done), |
| } |
| } |
| |
| <span class="kw">pub fn </span>pop(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Vec<u8>> { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(d) = <span class="self">self</span>.queue.as_mut().and_then(|q| q.pop_front()) { |
| <span class="self">self</span>.queue_bytes_size = <span class="self">self</span>.queue_bytes_size.saturating_sub(d.len()); |
| <span class="kw">return </span><span class="prelude-val">Some</span>(d); |
| } |
| |
| <span class="prelude-val">None |
| </span>} |
| |
| <span class="kw">pub fn </span>has_pending(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| !<span class="self">self</span>.queue.as_ref().map(|q| q.is_empty()).unwrap_or(<span class="bool-val">true</span>) |
| } |
| |
| <span class="kw">pub fn </span>purge<F: Fn(<span class="kw-2">&</span>[u8]) -> bool>(<span class="kw-2">&mut </span><span class="self">self</span>, f: F) { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(q) = <span class="self">self</span>.queue.as_mut() { |
| q.retain(|d| !f(d)); |
| <span class="self">self</span>.queue_bytes_size = q.iter().fold(<span class="number">0</span>, |total, d| total + d.len()); |
| } |
| } |
| |
| <span class="kw">pub fn </span>is_full(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.len() == <span class="self">self</span>.queue_max_len |
| } |
| |
| <span class="kw">pub fn </span>is_empty(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.len() == <span class="number">0 |
| </span>} |
| |
| <span class="kw">pub fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.queue.as_ref().map(|q| q.len()).unwrap_or(<span class="number">0</span>) |
| } |
| |
| <span class="kw">pub fn </span>byte_size(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.queue_bytes_size |
| } |
| } |
| </code></pre></div></section></main></body></html> |
