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| </pre></div><pre class="rust"><code><span class="comment">// Copyright (C) 2019, 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">super</span>::Result; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::h3::NameValue; |
| |
| <span class="kw">use </span><span class="kw">super</span>::INDEXED; |
| <span class="kw">use </span><span class="kw">super</span>::LITERAL; |
| <span class="kw">use </span><span class="kw">super</span>::LITERAL_WITH_NAME_REF; |
| |
| <span class="doccomment">/// A QPACK encoder. |
| </span><span class="attr">#[derive(Default)] |
| </span><span class="kw">pub struct </span>Encoder {} |
| |
| <span class="kw">impl </span>Encoder { |
| <span class="doccomment">/// Creates a new QPACK encoder. |
| </span><span class="kw">pub fn </span>new() -> Encoder { |
| Encoder::default() |
| } |
| |
| <span class="doccomment">/// Encodes a list of headers into a QPACK header block. |
| </span><span class="kw">pub fn </span>encode<T: NameValue>( |
| <span class="kw-2">&mut </span><span class="self">self</span>, headers: <span class="kw-2">&</span>[T], out: <span class="kw-2">&mut </span>[u8], |
| ) -> <span class="prelude-ty">Result</span><usize> { |
| <span class="kw">let </span><span class="kw-2">mut </span>b = octets::OctetsMut::with_slice(out); |
| |
| <span class="comment">// Required Insert Count. |
| </span>encode_int(<span class="number">0</span>, <span class="number">0</span>, <span class="number">8</span>, <span class="kw-2">&mut </span>b)<span class="question-mark">?</span>; |
| |
| <span class="comment">// Base. |
| </span>encode_int(<span class="number">0</span>, <span class="number">0</span>, <span class="number">7</span>, <span class="kw-2">&mut </span>b)<span class="question-mark">?</span>; |
| |
| <span class="kw">for </span>h <span class="kw">in </span>headers { |
| <span class="kw">match </span>lookup_static(h) { |
| <span class="prelude-val">Some</span>((idx, <span class="bool-val">true</span>)) => { |
| <span class="kw">const </span>STATIC: u8 = <span class="number">0x40</span>; |
| |
| <span class="comment">// Encode as statically indexed. |
| </span>encode_int(idx, INDEXED | STATIC, <span class="number">6</span>, <span class="kw-2">&mut </span>b)<span class="question-mark">?</span>; |
| }, |
| |
| <span class="prelude-val">Some</span>((idx, <span class="bool-val">false</span>)) => { |
| <span class="kw">const </span>STATIC: u8 = <span class="number">0x10</span>; |
| |
| <span class="comment">// Encode value as literal with static name reference. |
| </span>encode_int(idx, LITERAL_WITH_NAME_REF | STATIC, <span class="number">4</span>, <span class="kw-2">&mut </span>b)<span class="question-mark">?</span>; |
| encode_str::<<span class="bool-val">false</span>>(h.value(), <span class="number">0</span>, <span class="number">7</span>, <span class="kw-2">&mut </span>b)<span class="question-mark">?</span>; |
| }, |
| |
| <span class="prelude-val">None </span>=> { |
| <span class="comment">// Encode as fully literal. |
| |
| </span>encode_str::<<span class="bool-val">true</span>>(h.name(), LITERAL, <span class="number">3</span>, <span class="kw-2">&mut </span>b)<span class="question-mark">?</span>; |
| encode_str::<<span class="bool-val">false</span>>(h.value(), <span class="number">0</span>, <span class="number">7</span>, <span class="kw-2">&mut </span>b)<span class="question-mark">?</span>; |
| }, |
| }; |
| } |
| |
| <span class="prelude-val">Ok</span>(b.off()) |
| } |
| } |
| |
| <span class="kw">fn </span>lookup_static<T: NameValue>(h: <span class="kw-2">&</span>T) -> <span class="prelude-ty">Option</span><(u64, bool)> { |
| <span class="comment">// Fetch the right encoding table for this header length. |
| </span><span class="kw">let </span>table_for_len = |
| <span class="kw">super</span>::static_table::STATIC_ENCODE_TABLE.get(h.name().len())<span class="question-mark">?</span>; |
| |
| <span class="comment">// Similar to [`eq_ignore_ascii_case`], but only lowercases the second |
| // operand, as the entries in the table are already lower cased. |
| </span><span class="kw">let </span>cmp_lowercase = |a: <span class="kw-2">&</span>[u8], b: <span class="kw-2">&</span>[u8]| { |
| std::iter::zip(a, b).all(|(a, b)| a.eq(<span class="kw-2">&</span>b.to_ascii_lowercase())) |
| }; |
| |
| <span class="kw">for </span>(name, values) <span class="kw">in </span>table_for_len.iter() { |
| <span class="comment">// Match header name first. |
| </span><span class="kw">if </span>cmp_lowercase(name, h.name()) { |
| <span class="comment">// Second iterate over possible values for the header. |
| </span><span class="kw">for </span>(value, enc) <span class="kw">in </span>values.iter() { |
| <span class="comment">// Match header value. |
| </span><span class="kw">if </span>value.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">Some</span>((<span class="kw-2">*</span>enc, <span class="bool-val">false</span>)); |
| } |
| |
| <span class="kw">if </span>h.value() == <span class="kw-2">*</span>value { |
| <span class="kw">return </span><span class="prelude-val">Some</span>((<span class="kw-2">*</span>enc, <span class="bool-val">true</span>)); |
| } |
| } |
| <span class="comment">// Only matched the header, not the value. |
| </span><span class="kw">return </span><span class="prelude-val">Some</span>((values.first()<span class="question-mark">?</span>.<span class="number">1</span>, <span class="bool-val">false</span>)); |
| } |
| } |
| |
| <span class="prelude-val">None |
| </span>} |
| |
| <span class="kw">fn </span>encode_int( |
| <span class="kw-2">mut </span>v: u64, first: u8, prefix: usize, b: <span class="kw-2">&mut </span>octets::OctetsMut, |
| ) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">let </span>mask = <span class="number">2u64</span>.pow(prefix <span class="kw">as </span>u32) - <span class="number">1</span>; |
| |
| <span class="comment">// Encode I on N bits. |
| </span><span class="kw">if </span>v < mask { |
| b.put_u8(first | v <span class="kw">as </span>u8)<span class="question-mark">?</span>; |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(()); |
| } |
| |
| <span class="comment">// Encode (2^N - 1) on N bits. |
| </span>b.put_u8(first | mask <span class="kw">as </span>u8)<span class="question-mark">?</span>; |
| |
| v -= mask; |
| |
| <span class="kw">while </span>v >= <span class="number">128 </span>{ |
| <span class="comment">// Encode (I % 128 + 128) on 8 bits. |
| </span>b.put_u8((v % <span class="number">128 </span>+ <span class="number">128</span>) <span class="kw">as </span>u8)<span class="question-mark">?</span>; |
| |
| v >>= <span class="number">7</span>; |
| } |
| |
| <span class="comment">// Encode I on 8 bits. |
| </span>b.put_u8(v <span class="kw">as </span>u8)<span class="question-mark">?</span>; |
| |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="attr">#[inline] |
| </span><span class="kw">fn </span>encode_str<<span class="kw">const </span>LOWER_CASE: bool>( |
| v: <span class="kw-2">&</span>[u8], first: u8, prefix: usize, b: <span class="kw-2">&mut </span>octets::OctetsMut, |
| ) -> <span class="prelude-ty">Result</span><()> { |
| <span class="comment">// Huffman-encoding generally saves space but in some cases it doesn't, for |
| // those just encode the literal string. |
| </span><span class="kw">match </span><span class="kw">super</span>::huffman::encode_output_length::<LOWER_CASE>(v) { |
| <span class="prelude-val">Ok</span>(len) => { |
| encode_int(len <span class="kw">as </span>u64, first | <span class="number">1 </span><< prefix, prefix, b)<span class="question-mark">?</span>; |
| <span class="kw">super</span>::huffman::encode::<LOWER_CASE>(v, b)<span class="question-mark">?</span>; |
| }, |
| |
| <span class="prelude-val">Err</span>(<span class="kw">super</span>::Error::InflatedHuffmanEncoding) => { |
| encode_int(v.len() <span class="kw">as </span>u64, first, prefix, b)<span class="question-mark">?</span>; |
| <span class="kw">if </span>LOWER_CASE { |
| b.put_bytes(<span class="kw-2">&</span>v.to_ascii_lowercase())<span class="question-mark">?</span>; |
| } <span class="kw">else </span>{ |
| b.put_bytes(v)<span class="question-mark">?</span>; |
| } |
| }, |
| |
| <span class="prelude-val">Err</span>(e) => <span class="kw">return </span><span class="prelude-val">Err</span>(e), |
| } |
| |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="attr">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>encode_int1() { |
| <span class="kw">let </span>expected = [<span class="number">0b01010</span>]; |
| <span class="kw">let </span><span class="kw-2">mut </span>encoded = [<span class="number">0</span>; <span class="number">1</span>]; |
| <span class="kw">let </span><span class="kw-2">mut </span>b = octets::OctetsMut::with_slice(<span class="kw-2">&mut </span>encoded); |
| |
| <span class="macro">assert!</span>(encode_int(<span class="number">10</span>, <span class="number">0</span>, <span class="number">5</span>, <span class="kw-2">&mut </span>b).is_ok()); |
| |
| <span class="macro">assert_eq!</span>(expected, encoded); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>encode_int2() { |
| <span class="kw">let </span>expected = [<span class="number">0b11111</span>, <span class="number">0b10011010</span>, <span class="number">0b00001010</span>]; |
| <span class="kw">let </span><span class="kw-2">mut </span>encoded = [<span class="number">0</span>; <span class="number">3</span>]; |
| <span class="kw">let </span><span class="kw-2">mut </span>b = octets::OctetsMut::with_slice(<span class="kw-2">&mut </span>encoded); |
| |
| <span class="macro">assert!</span>(encode_int(<span class="number">1337</span>, <span class="number">0</span>, <span class="number">5</span>, <span class="kw-2">&mut </span>b).is_ok()); |
| |
| <span class="macro">assert_eq!</span>(expected, encoded); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>encode_int3() { |
| <span class="kw">let </span>expected = [<span class="number">0b101010</span>]; |
| <span class="kw">let </span><span class="kw-2">mut </span>encoded = [<span class="number">0</span>; <span class="number">1</span>]; |
| <span class="kw">let </span><span class="kw-2">mut </span>b = octets::OctetsMut::with_slice(<span class="kw-2">&mut </span>encoded); |
| |
| <span class="macro">assert!</span>(encode_int(<span class="number">42</span>, <span class="number">0</span>, <span class="number">8</span>, <span class="kw-2">&mut </span>b).is_ok()); |
| |
| <span class="macro">assert_eq!</span>(expected, encoded); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>encode_static_header() { |
| <span class="kw">let </span><span class="kw-2">mut </span>encoded = [<span class="number">0</span>; <span class="number">3</span>]; |
| Encoder::default() |
| .encode(<span class="kw-2">&</span>[(<span class="string">b":method"</span>, <span class="string">b"GET"</span>)], <span class="kw-2">&mut </span>encoded) |
| .unwrap(); |
| <span class="macro">assert_eq!</span>(encoded, [<span class="number">0</span>, <span class="number">0</span>, INDEXED | <span class="number">0x40 </span>| <span class="number">17</span>]); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>encode_static_header_name_only() { |
| <span class="kw">let </span><span class="kw-2">mut </span>encoded = [<span class="number">0</span>; <span class="number">11</span>]; |
| <span class="kw">let </span><span class="kw-2">mut </span>expected = [<span class="number">0</span>; <span class="number">11</span>]; |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = octets::OctetsMut::with_slice(<span class="kw-2">&mut </span>expected[..]); |
| buf.put_u16(<span class="number">0</span>).unwrap(); |
| buf.put_u8(LITERAL_WITH_NAME_REF | <span class="number">0x10 </span>| <span class="number">15</span>).unwrap(); |
| buf.put_u8(<span class="number">0</span>).unwrap(); |
| encode_str::<<span class="bool-val">false</span>>(<span class="string">b"FORGET"</span>, <span class="number">0</span>, <span class="number">7</span>, <span class="kw-2">&mut </span>buf).unwrap(); |
| |
| Encoder::default() |
| .encode(<span class="kw-2">&</span>[(<span class="string">b":method"</span>, <span class="string">b"FORGET"</span>)], <span class="kw-2">&mut </span>encoded) |
| .unwrap(); |
| <span class="macro">assert_eq!</span>(encoded, expected); |
| } |
| } |
| </code></pre></div></section></main></body></html> |
