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| </pre><pre class="rust"><code><span class="kw">use </span>bitpacking::{BitPacker, BitPacker4x}; |
| <span class="kw">use </span>common::FixedSize; |
| |
| <span class="kw">pub const </span>COMPRESSION_BLOCK_SIZE: usize = BitPacker4x::BLOCK_LEN; |
| <span class="kw">const </span>COMPRESSED_BLOCK_MAX_SIZE: usize = COMPRESSION_BLOCK_SIZE * u32::SIZE_IN_BYTES; |
| |
| <span class="kw">mod </span>vint; |
| |
| <span class="doccomment">/// Returns the size in bytes of a compressed block, given `num_bits`. |
| </span><span class="kw">pub fn </span>compressed_block_size(num_bits: u8) -> usize { |
| (num_bits <span class="kw">as </span>usize) * COMPRESSION_BLOCK_SIZE / <span class="number">8 |
| </span>} |
| |
| <span class="kw">pub struct </span>BlockEncoder { |
| bitpacker: BitPacker4x, |
| <span class="kw">pub </span>output: [u8; COMPRESSED_BLOCK_MAX_SIZE], |
| <span class="kw">pub </span>output_len: usize, |
| } |
| |
| <span class="kw">impl </span>Default <span class="kw">for </span>BlockEncoder { |
| <span class="kw">fn </span>default() -> <span class="self">Self </span>{ |
| BlockEncoder::new() |
| } |
| } |
| |
| <span class="kw">impl </span>BlockEncoder { |
| <span class="kw">pub fn </span>new() -> BlockEncoder { |
| BlockEncoder { |
| bitpacker: BitPacker4x::new(), |
| output: [<span class="number">0u8</span>; COMPRESSED_BLOCK_MAX_SIZE], |
| output_len: <span class="number">0</span>, |
| } |
| } |
| |
| <span class="kw">pub fn </span>compress_block_sorted(<span class="kw-2">&mut </span><span class="self">self</span>, block: <span class="kw-2">&</span>[u32], offset: u32) -> (u8, <span class="kw-2">&</span>[u8]) { |
| <span class="kw">let </span>num_bits = <span class="self">self</span>.bitpacker.num_bits_sorted(offset, block); |
| <span class="kw">let </span>written_size = |
| <span class="self">self</span>.bitpacker |
| .compress_sorted(offset, block, <span class="kw-2">&mut </span><span class="self">self</span>.output[..], num_bits); |
| (num_bits, <span class="kw-2">&</span><span class="self">self</span>.output[..written_size]) |
| } |
| |
| <span class="kw">pub fn </span>compress_block_unsorted(<span class="kw-2">&mut </span><span class="self">self</span>, block: <span class="kw-2">&</span>[u32]) -> (u8, <span class="kw-2">&</span>[u8]) { |
| <span class="kw">let </span>num_bits = <span class="self">self</span>.bitpacker.num_bits(block); |
| <span class="kw">let </span>written_size = <span class="self">self |
| </span>.bitpacker |
| .compress(block, <span class="kw-2">&mut </span><span class="self">self</span>.output[..], num_bits); |
| (num_bits, <span class="kw-2">&</span><span class="self">self</span>.output[..written_size]) |
| } |
| } |
| |
| <span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub struct </span>BlockDecoder { |
| bitpacker: BitPacker4x, |
| output: [u32; COMPRESSION_BLOCK_SIZE], |
| <span class="kw">pub </span>output_len: usize, |
| } |
| |
| <span class="kw">impl </span>Default <span class="kw">for </span>BlockDecoder { |
| <span class="kw">fn </span>default() -> <span class="self">Self </span>{ |
| BlockDecoder::with_val(<span class="number">0u32</span>) |
| } |
| } |
| |
| <span class="kw">impl </span>BlockDecoder { |
| <span class="kw">pub fn </span>with_val(val: u32) -> BlockDecoder { |
| BlockDecoder { |
| bitpacker: BitPacker4x::new(), |
| output: [val; COMPRESSION_BLOCK_SIZE], |
| output_len: <span class="number">0</span>, |
| } |
| } |
| |
| <span class="kw">pub fn </span>uncompress_block_sorted( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| compressed_data: <span class="kw-2">&</span>[u8], |
| offset: u32, |
| num_bits: u8, |
| ) -> usize { |
| <span class="self">self</span>.output_len = COMPRESSION_BLOCK_SIZE; |
| <span class="self">self</span>.bitpacker |
| .decompress_sorted(offset, compressed_data, <span class="kw-2">&mut </span><span class="self">self</span>.output, num_bits) |
| } |
| |
| <span class="kw">pub fn </span>uncompress_block_unsorted(<span class="kw-2">&mut </span><span class="self">self</span>, compressed_data: <span class="kw-2">&</span>[u8], num_bits: u8) -> usize { |
| <span class="self">self</span>.output_len = COMPRESSION_BLOCK_SIZE; |
| <span class="self">self</span>.bitpacker |
| .decompress(compressed_data, <span class="kw-2">&mut </span><span class="self">self</span>.output, num_bits) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>output_array(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[u32] { |
| <span class="kw-2">&</span><span class="self">self</span>.output[..<span class="self">self</span>.output_len] |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>full_output(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[u32; COMPRESSION_BLOCK_SIZE] { |
| <span class="kw-2">&</span><span class="self">self</span>.output |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>output(<span class="kw-2">&</span><span class="self">self</span>, idx: usize) -> u32 { |
| <span class="self">self</span>.output[idx] |
| } |
| } |
| |
| <span class="kw">pub trait </span>VIntEncoder { |
| <span class="doccomment">/// Compresses an array of `u32` integers, |
| /// using [delta-encoding](https://en.wikipedia.org/wiki/Delta_encoding) |
| /// and variable bytes encoding. |
| /// |
| /// The method takes an array of ints to compress, and returns |
| /// a `&[u8]` representing the compressed data. |
| /// |
| /// The method also takes an offset to give the value of the |
| /// hypothetical previous element in the delta-encoding. |
| </span><span class="kw">fn </span>compress_vint_sorted(<span class="kw-2">&mut </span><span class="self">self</span>, input: <span class="kw-2">&</span>[u32], offset: u32) -> <span class="kw-2">&</span>[u8]; |
| |
| <span class="doccomment">/// Compresses an array of `u32` integers, |
| /// using variable bytes encoding. |
| /// |
| /// The method takes an array of ints to compress, and returns |
| /// a `&[u8]` representing the compressed data. |
| </span><span class="kw">fn </span>compress_vint_unsorted(<span class="kw-2">&mut </span><span class="self">self</span>, input: <span class="kw-2">&</span>[u32]) -> <span class="kw-2">&</span>[u8]; |
| } |
| |
| <span class="kw">pub trait </span>VIntDecoder { |
| <span class="doccomment">/// Uncompress an array of `u32` integers, |
| /// that were compressed using [delta-encoding](https://en.wikipedia.org/wiki/Delta_encoding) |
| /// and variable bytes encoding. |
| /// |
| /// The method takes a number of int to decompress, and returns |
| /// the amount of bytes that were read to decompress them. |
| /// |
| /// The method also takes an offset to give the value of the |
| /// hypothetical previous element in the delta-encoding. |
| /// |
| /// For instance, if delta encoded are `1, 3, 9`, and the |
| /// `offset` is 5, then the output will be: |
| /// `5 + 1 = 6, 6 + 3= 9, 9 + 9 = 18` |
| /// |
| /// The value given in `padding` will be used to fill the remaining `128 - num_els` values. |
| </span><span class="kw">fn </span>uncompress_vint_sorted( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| compressed_data: <span class="kw-2">&</span>[u8], |
| offset: u32, |
| num_els: usize, |
| padding: u32, |
| ) -> usize; |
| |
| <span class="doccomment">/// Uncompress an array of `u32s`, compressed using variable |
| /// byte encoding. |
| /// |
| /// The method takes a number of int to decompress, and returns |
| /// the amount of bytes that were read to decompress them. |
| /// |
| /// The value given in `padding` will be used to fill the remaining `128 - num_els` values. |
| </span><span class="kw">fn </span>uncompress_vint_unsorted( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| compressed_data: <span class="kw-2">&</span>[u8], |
| num_els: usize, |
| padding: u32, |
| ) -> usize; |
| |
| <span class="kw">fn </span>uncompress_vint_unsorted_until_end(<span class="kw-2">&mut </span><span class="self">self</span>, compressed_data: <span class="kw-2">&</span>[u8]); |
| } |
| |
| <span class="kw">impl </span>VIntEncoder <span class="kw">for </span>BlockEncoder { |
| <span class="kw">fn </span>compress_vint_sorted(<span class="kw-2">&mut </span><span class="self">self</span>, input: <span class="kw-2">&</span>[u32], offset: u32) -> <span class="kw-2">&</span>[u8] { |
| vint::compress_sorted(input, <span class="kw-2">&mut </span><span class="self">self</span>.output, offset) |
| } |
| |
| <span class="kw">fn </span>compress_vint_unsorted(<span class="kw-2">&mut </span><span class="self">self</span>, input: <span class="kw-2">&</span>[u32]) -> <span class="kw-2">&</span>[u8] { |
| vint::compress_unsorted(input, <span class="kw-2">&mut </span><span class="self">self</span>.output) |
| } |
| } |
| |
| <span class="kw">impl </span>VIntDecoder <span class="kw">for </span>BlockDecoder { |
| <span class="kw">fn </span>uncompress_vint_sorted( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| compressed_data: <span class="kw-2">&</span>[u8], |
| offset: u32, |
| num_els: usize, |
| padding: u32, |
| ) -> usize { |
| <span class="self">self</span>.output_len = num_els; |
| <span class="self">self</span>.output.iter_mut().for_each(|el| <span class="kw-2">*</span>el = padding); |
| vint::uncompress_sorted(compressed_data, <span class="kw-2">&mut </span><span class="self">self</span>.output[..num_els], offset) |
| } |
| |
| <span class="kw">fn </span>uncompress_vint_unsorted( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| compressed_data: <span class="kw-2">&</span>[u8], |
| num_els: usize, |
| padding: u32, |
| ) -> usize { |
| <span class="self">self</span>.output_len = num_els; |
| <span class="self">self</span>.output.iter_mut().for_each(|el| <span class="kw-2">*</span>el = padding); |
| vint::uncompress_unsorted(compressed_data, <span class="kw-2">&mut </span><span class="self">self</span>.output[..num_els]) |
| } |
| |
| <span class="kw">fn </span>uncompress_vint_unsorted_until_end(<span class="kw-2">&mut </span><span class="self">self</span>, compressed_data: <span class="kw-2">&</span>[u8]) { |
| <span class="kw">let </span>num_els = vint::uncompress_unsorted_until_end(compressed_data, <span class="kw-2">&mut </span><span class="self">self</span>.output); |
| <span class="self">self</span>.output_len = num_els; |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">pub mod </span>tests { |
| |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::TERMINATED; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_encode_sorted_block() { |
| <span class="kw">let </span>vals: Vec<u32> = (<span class="number">0u32</span>..<span class="number">128u32</span>).map(|i| i * <span class="number">7</span>).collect(); |
| <span class="kw">let </span><span class="kw-2">mut </span>encoder = BlockEncoder::new(); |
| <span class="kw">let </span>(num_bits, compressed_data) = encoder.compress_block_sorted(<span class="kw-2">&</span>vals, <span class="number">0</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>decoder = BlockDecoder::default(); |
| { |
| <span class="kw">let </span>consumed_num_bytes = decoder.uncompress_block_sorted(compressed_data, <span class="number">0</span>, num_bits); |
| <span class="macro">assert_eq!</span>(consumed_num_bytes, compressed_data.len()); |
| } |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..<span class="number">128 </span>{ |
| <span class="macro">assert_eq!</span>(vals[i], decoder.output(i)); |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_encode_sorted_block_with_offset() { |
| <span class="kw">let </span>vals: Vec<u32> = (<span class="number">0u32</span>..<span class="number">128u32</span>).map(|i| <span class="number">11 </span>+ i * <span class="number">7</span>).collect(); |
| <span class="kw">let </span><span class="kw-2">mut </span>encoder = BlockEncoder::default(); |
| <span class="kw">let </span>(num_bits, compressed_data) = encoder.compress_block_sorted(<span class="kw-2">&</span>vals, <span class="number">10</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>decoder = BlockDecoder::default(); |
| { |
| <span class="kw">let </span>consumed_num_bytes = decoder.uncompress_block_sorted(compressed_data, <span class="number">10</span>, num_bits); |
| <span class="macro">assert_eq!</span>(consumed_num_bytes, compressed_data.len()); |
| } |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..<span class="number">128 </span>{ |
| <span class="macro">assert_eq!</span>(vals[i], decoder.output(i)); |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_encode_sorted_block_with_junk() { |
| <span class="kw">let </span><span class="kw-2">mut </span>compressed: Vec<u8> = Vec::new(); |
| <span class="kw">let </span>n = <span class="number">128</span>; |
| <span class="kw">let </span>vals: Vec<u32> = (<span class="number">0</span>..n).map(|i| <span class="number">11u32 </span>+ (i <span class="kw">as </span>u32) * <span class="number">7u32</span>).collect(); |
| <span class="kw">let </span><span class="kw-2">mut </span>encoder = BlockEncoder::default(); |
| <span class="kw">let </span>(num_bits, compressed_data) = encoder.compress_block_sorted(<span class="kw-2">&</span>vals, <span class="number">10</span>); |
| compressed.extend_from_slice(compressed_data); |
| compressed.push(<span class="number">173u8</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>decoder = BlockDecoder::default(); |
| { |
| <span class="kw">let </span>consumed_num_bytes = decoder.uncompress_block_sorted(<span class="kw-2">&</span>compressed, <span class="number">10</span>, num_bits); |
| <span class="macro">assert_eq!</span>(consumed_num_bytes, compressed.len() - <span class="number">1</span>); |
| <span class="macro">assert_eq!</span>(compressed[consumed_num_bytes], <span class="number">173u8</span>); |
| } |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..n { |
| <span class="macro">assert_eq!</span>(vals[i], decoder.output(i)); |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_encode_unsorted_block_with_junk() { |
| <span class="kw">let </span><span class="kw-2">mut </span>compressed: Vec<u8> = Vec::new(); |
| <span class="kw">let </span>n = <span class="number">128</span>; |
| <span class="kw">let </span>vals: Vec<u32> = (<span class="number">0</span>..n).map(|i| <span class="number">11u32 </span>+ (i <span class="kw">as </span>u32) * <span class="number">7u32 </span>% <span class="number">12</span>).collect(); |
| <span class="kw">let </span><span class="kw-2">mut </span>encoder = BlockEncoder::default(); |
| <span class="kw">let </span>(num_bits, compressed_data) = encoder.compress_block_unsorted(<span class="kw-2">&</span>vals); |
| compressed.extend_from_slice(compressed_data); |
| compressed.push(<span class="number">173u8</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>decoder = BlockDecoder::default(); |
| { |
| <span class="kw">let </span>consumed_num_bytes = decoder.uncompress_block_unsorted(<span class="kw-2">&</span>compressed, num_bits); |
| <span class="macro">assert_eq!</span>(consumed_num_bytes + <span class="number">1</span>, compressed.len()); |
| <span class="macro">assert_eq!</span>(compressed[consumed_num_bytes], <span class="number">173u8</span>); |
| } |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..n { |
| <span class="macro">assert_eq!</span>(vals[i], decoder.output(i)); |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_block_decoder_initialization() { |
| <span class="kw">let </span>block = BlockDecoder::with_val(TERMINATED); |
| <span class="macro">assert_eq!</span>(block.output(<span class="number">0</span>), TERMINATED); |
| } |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_encode_vint() { |
| <span class="kw">const </span>PADDING_VALUE: u32 = <span class="number">234_234_345u32</span>; |
| <span class="kw">let </span>expected_length = <span class="number">154</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>encoder = BlockEncoder::new(); |
| <span class="kw">let </span>input: Vec<u32> = (<span class="number">0u32</span>..<span class="number">123u32</span>).map(|i| <span class="number">4 </span>+ i * <span class="number">7 </span>/ <span class="number">2</span>).into_iter().collect(); |
| <span class="kw">for </span>offset <span class="kw">in </span><span class="kw-2">&</span>[<span class="number">0u32</span>, <span class="number">1u32</span>, <span class="number">2u32</span>] { |
| <span class="kw">let </span>encoded_data = encoder.compress_vint_sorted(<span class="kw-2">&</span>input, <span class="kw-2">*</span>offset); |
| <span class="macro">assert!</span>(encoded_data.len() <= expected_length); |
| <span class="kw">let </span><span class="kw-2">mut </span>decoder = BlockDecoder::default(); |
| <span class="kw">let </span>consumed_num_bytes = |
| decoder.uncompress_vint_sorted(encoded_data, <span class="kw-2">*</span>offset, input.len(), PADDING_VALUE); |
| <span class="macro">assert_eq!</span>(consumed_num_bytes, encoded_data.len()); |
| <span class="macro">assert_eq!</span>(input, decoder.output_array()); |
| <span class="kw">for </span>i <span class="kw">in </span>input.len()..COMPRESSION_BLOCK_SIZE { |
| <span class="macro">assert_eq!</span>(decoder.output(i), PADDING_VALUE); |
| } |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(all(test, feature = <span class="string">"unstable"</span>))] |
| </span><span class="kw">mod </span>bench { |
| |
| <span class="kw">use </span>rand::rngs::StdRng; |
| <span class="kw">use </span>rand::{Rng, SeedableRng}; |
| <span class="kw">use </span>test::Bencher; |
| |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::TERMINATED; |
| |
| <span class="kw">fn </span>generate_array_with_seed(n: usize, ratio: f64, seed_val: u8) -> Vec<u32> { |
| <span class="kw">let </span><span class="kw-2">mut </span>seed: [u8; <span class="number">32</span>] = [<span class="number">0</span>; <span class="number">32</span>]; |
| seed[<span class="number">31</span>] = seed_val; |
| <span class="kw">let </span><span class="kw-2">mut </span>rng = StdRng::from_seed(seed); |
| (<span class="number">0u32</span>..).filter(|<span class="kw">_</span>| rng.gen_bool(ratio)).take(n).collect() |
| } |
| |
| <span class="kw">pub fn </span>generate_array(n: usize, ratio: f64) -> Vec<u32> { |
| generate_array_with_seed(n, ratio, <span class="number">4</span>) |
| } |
| |
| <span class="attribute">#[bench] |
| </span><span class="kw">fn </span>bench_compress(b: <span class="kw-2">&mut </span>Bencher) { |
| <span class="kw">let </span><span class="kw-2">mut </span>encoder = BlockEncoder::new(); |
| <span class="kw">let </span>data = generate_array(COMPRESSION_BLOCK_SIZE, <span class="number">0.1</span>); |
| b.iter(|| { |
| encoder.compress_block_sorted(<span class="kw-2">&</span>data, <span class="number">0u32</span>); |
| }); |
| } |
| |
| <span class="attribute">#[bench] |
| </span><span class="kw">fn </span>bench_uncompress(b: <span class="kw-2">&mut </span>Bencher) { |
| <span class="kw">let </span><span class="kw-2">mut </span>encoder = BlockEncoder::new(); |
| <span class="kw">let </span>data = generate_array(COMPRESSION_BLOCK_SIZE, <span class="number">0.1</span>); |
| <span class="kw">let </span>(num_bits, compressed) = encoder.compress_block_sorted(<span class="kw-2">&</span>data, <span class="number">0u32</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>decoder = BlockDecoder::default(); |
| b.iter(|| { |
| decoder.uncompress_block_sorted(compressed, <span class="number">0u32</span>, num_bits); |
| }); |
| } |
| |
| <span class="comment">//#[test] |
| // fn test_all_docs_compression_numbits() { |
| // for expected_num_bits in 0u8.. { |
| // let mut data = [0u32; 128]; |
| // if expected_num_bits > 0 { |
| // data[0] = (1u64 << (expected_num_bits as usize) - 1) as u32; |
| //} |
| // let mut encoder = BlockEncoder::new(); |
| // let (num_bits, compressed) = encoder.compress_block_unsorted(&data); |
| // assert_eq!(compressed.len(), compressed_block_size(num_bits)); |
| //} |
| |
| </span><span class="kw">const </span>NUM_INTS_BENCH_VINT: usize = <span class="number">10</span>; |
| |
| <span class="attribute">#[bench] |
| </span><span class="kw">fn </span>bench_compress_vint(b: <span class="kw-2">&mut </span>Bencher) { |
| <span class="kw">let </span><span class="kw-2">mut </span>encoder = BlockEncoder::new(); |
| <span class="kw">let </span>data = generate_array(NUM_INTS_BENCH_VINT, <span class="number">0.001</span>); |
| b.iter(|| { |
| encoder.compress_vint_sorted(<span class="kw-2">&</span>data, <span class="number">0u32</span>); |
| }); |
| } |
| |
| <span class="attribute">#[bench] |
| </span><span class="kw">fn </span>bench_uncompress_vint(b: <span class="kw-2">&mut </span>Bencher) { |
| <span class="kw">let </span><span class="kw-2">mut </span>encoder = BlockEncoder::new(); |
| <span class="kw">let </span>data = generate_array(NUM_INTS_BENCH_VINT, <span class="number">0.001</span>); |
| <span class="kw">let </span>compressed = encoder.compress_vint_sorted(<span class="kw-2">&</span>data, <span class="number">0u32</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>decoder = BlockDecoder::default(); |
| b.iter(|| { |
| decoder.uncompress_vint_sorted(compressed, <span class="number">0u32</span>, NUM_INTS_BENCH_VINT, TERMINATED); |
| }); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../../" data-current-crate="tantivy" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |