20027970177

Committed 08 Dec 2025 12:22PM UTC coverage: 62.013% (-0.05%) from 62.065%

Build # 20027970177

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github

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vigna

Commit Message

Now we use from_path for bit readers and writers

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75.64

/webgraph/src/utils/batch_codec/gaps.rs

/*
 * SPDX-FileCopyrightText: 2023 Inria
 * SPDX-FileCopyrightText: 2023 Sebastiano Vigna
 * SPDX-FileCopyrightText: 2025 Tommaso Fontana
 *
 * SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later
 */

use super::{BitReader, BitWriter};
use crate::traits::SortedIterator;
use crate::utils::{ArcMmapHelper, MmapHelper, Triple};
use crate::{
    traits::{BitDeserializer, BitSerializer},
    utils::{BatchCodec, humanize},
};

use std::sync::Arc;

use anyhow::{Context, Result};
use dsi_bitstream::prelude::*;
use mmap_rs::MmapFlags;
use rdst::*;

#[derive(Clone, Debug)]
/// A codec for encoding and decoding batches of triples using gap compression.
///
/// This codec encodes triples of the form `(src, dst, label)` by encoding the
/// gaps between consecutive sources and destinations using a specified code.
///
/// # Type Parameters
///
/// - `S`: Serializer for the labels, implementing [`BitSerializer`] for the label type.
/// - `D`: Deserializer for the labels, implementing [`BitDeserializer`] for the label type.
/// - `SRC_CODE`: Code used for encoding source gaps (default: gamma).
/// - `DST_CODE`: Code used for encoding destination gaps (default: gamma).
///
/// # Encoding Format
///
/// 1. The batch length is written using delta coding.
/// 2. For each group of triples with the same source:
///     - The gap from the previous source is encoded.
///     - The gap from the previous destination is encoded.
///     - The label is serialized.
///
/// The bit deserializer must be [`Clone`] because we need one for each
/// [`GapsIterator`], and there are possible scenarios in which the
/// deserializer might be stateful.
pub struct GapsCodec<
    E: Endianness = NE,
    S: BitSerializer<E, BitWriter<E>> = (),
    D: BitDeserializer<E, BitReader<E>, DeserType = S::SerType> + Clone = (),
    const SRC_CODE: usize = { dsi_bitstream::dispatch::code_consts::GAMMA },
    const DST_CODE: usize = { dsi_bitstream::dispatch::code_consts::DELTA },
> where
    BitReader<E>: BitRead<E> + CodesRead<E>,
    BitWriter<E>: BitWrite<E> + CodesWrite<E>,
{
    /// Serializer for the labels
    pub serializer: S,
    /// Deserializer for the labels
    pub deserializer: D,
    /// Marker for the endianness
    pub _marker: std::marker::PhantomData<E>,
}

impl<E, S, D, const SRC_CODE: usize, const DST_CODE: usize> GapsCodec<E, S, D, SRC_CODE, DST_CODE>
where
    E: Endianness,
    S: BitSerializer<E, BitWriter<E>> + Send + Sync,
    D: BitDeserializer<E, BitReader<E>, DeserType = S::SerType> + Send + Sync + Clone,
    BitReader<E>: BitRead<E> + CodesRead<E>,
    BitWriter<E>: BitWrite<E> + CodesWrite<E>,
{
    /// Creates a new `GapsCodec` with the given serializer and deserializer.
    pub fn new(serializer: S, deserializer: D) -> Self {
        Self {
            serializer,
            deserializer,
            _marker: std::marker::PhantomData,
        }
    }
}

impl<E, S: Default, D: Default, const SRC_CODE: usize, const DST_CODE: usize> core::default::Default
    for GapsCodec<E, S, D, SRC_CODE, DST_CODE>
where
    E: Endianness,
    S: BitSerializer<E, BitWriter<E>> + Send + Sync,
    D: BitDeserializer<E, BitReader<E>, DeserType = S::SerType> + Send + Sync + Clone,
    BitReader<E>: BitRead<E> + CodesRead<E>,
    BitWriter<E>: BitWrite<E> + CodesWrite<E>,
{
    fn default() -> Self {
        Self::new(Default::default(), Default::default())
    }
}

#[derive(Debug, Clone, Copy)]
/// Statistics about the encoding performed by [`GapsCodec`].
pub struct GapsStats {
    /// Total number of triples encoded
    pub total_triples: usize,
    /// Number of bits used for source gaps
    pub src_bits: usize,
    //// Number of bits used for destination gaps
    pub dst_bits: usize,
    /// Number of bits used for labels
    pub labels_bits: usize,
}

impl core::fmt::Display for GapsStats {
    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
        let total_bits = self.src_bits + self.dst_bits + self.labels_bits;
        write!(
            f,
            "src: {}B ({:.3} bits / arc), dst: {}B ({:.3} bits / arc), labels: {}B ({:.3} bits / arc), total: {}B ({:.3} bits / arc)",
            humanize(self.src_bits as f64 / 8.0),
            self.src_bits as f64 / self.total_triples as f64,
            humanize(self.dst_bits as f64 / 8.0),
            self.dst_bits as f64 / self.total_triples as f64,
            humanize(self.labels_bits as f64 / 8.0),
            self.labels_bits as f64 / self.total_triples as f64,
            humanize(total_bits as f64 / 8.0),
            total_bits as f64 / self.total_triples as f64,
        )
    }
}

impl<E, S, D, const SRC_CODE: usize, const DST_CODE: usize> BatchCodec
    for GapsCodec<E, S, D, SRC_CODE, DST_CODE>
where
    E: Endianness,
    S: BitSerializer<E, BitWriter<E>> + Send + Sync,
    D: BitDeserializer<E, BitReader<E>, DeserType = S::SerType> + Send + Sync + Clone,
    S::SerType: Send + Sync + Copy + 'static + core::fmt::Debug, // needed by radix sort
    BitReader<E>: BitRead<E> + CodesRead<E>,
    BitWriter<E>: BitWrite<E> + CodesWrite<E>,
{
    type Label = S::SerType;
    type DecodedBatch = GapsIterator<E, D, SRC_CODE, DST_CODE>;
    type EncodedBatchStats = GapsStats;

    fn encode_batch(
        &self,
        path: impl AsRef<std::path::Path>,
        batch: &mut [((usize, usize), Self::Label)],
    ) -> Result<(usize, Self::EncodedBatchStats)> {
        let start = std::time::Instant::now();
        Triple::cast_batch_mut(batch).radix_sort_unstable();
        log::debug!("Sorted {} arcs in {:?}", batch.len(), start.elapsed());
        self.encode_sorted_batch(path, batch)
    }

    fn encode_sorted_batch(
        &self,
        path: impl AsRef<std::path::Path>,
        batch: &[((usize, usize), Self::Label)],
    ) -> Result<(usize, Self::EncodedBatchStats)> {
        debug_assert!(Triple::cast_batch(batch).is_sorted());
        // create a bitstream to write to the file
        let file_path = path.as_ref();
        let mut stream = buf_bit_writer::from_path::<E, usize>(file_path).with_context(|| {
            format!(
                "Could not create BatchIterator temporary file {}",
                file_path.display()
            )
        })?;

        // prefix the stream with the length of the batch
        // we use a delta code since it'll be a big number most of the time
        stream
            .write_delta(batch.len() as u64)
            .context("Could not write length")?;

        let mut stats = GapsStats {
            total_triples: batch.len(),
            src_bits: 0,
            dst_bits: 0,
            labels_bits: 0,
        };
        // dump the triples to the bitstrea
        let (mut prev_src, mut prev_dst) = (0, 0);
        for ((src, dst), label) in batch.iter() {
            // write the source gap as gamma
            stats.src_bits += ConstCode::<SRC_CODE>
                .write(&mut stream, (src - prev_src) as u64)
                .with_context(|| format!("Could not write {src} after {prev_src}"))?;
            if *src != prev_src {
                // Reset prev_y
                prev_dst = 0;
            }
            // write the destination gap as gamma
            stats.dst_bits += ConstCode::<DST_CODE>
                .write(&mut stream, (dst - prev_dst) as u64)
                .with_context(|| format!("Could not write {dst} after {prev_dst}"))?;
            // write the label
            stats.labels_bits += self
                .serializer
                .serialize(label, &mut stream)
                .context("Could not serialize label")?;
            (prev_src, prev_dst) = (*src, *dst);
        }
        // flush the stream and reset the buffer
        stream.flush().context("Could not flush stream")?;

        let total_bits = stats.src_bits + stats.dst_bits + stats.labels_bits;
        Ok((total_bits, stats))
    }

    fn decode_batch(&self, path: impl AsRef<std::path::Path>) -> Result<Self::DecodedBatch> {
        // open the file
        let mut stream = <BufBitReader<E, _>>::new(MemWordReader::new(ArcMmapHelper(Arc::new(
            MmapHelper::mmap(
                path.as_ref(),
                MmapFlags::TRANSPARENT_HUGE_PAGES | MmapFlags::SEQUENTIAL,
            )
            .with_context(|| format!("Could not mmap {}", path.as_ref().display()))?,
        ))));

        // read the length of the batch (first value in the stream)
        let len = stream.read_delta().context("Could not read length")? as usize;

        // create the iterator
        Ok(GapsIterator {
            deserializer: self.deserializer.clone(),
            stream,
            len,
            current: 0,
            prev_src: 0,
            prev_dst: 0,
        })
    }
}

#[derive(Clone, Debug)]
/// An iterator over triples encoded with gaps, this is returned by [`GapsCodec`].
pub struct GapsIterator<
    E: Endianness = NE,
    D: BitDeserializer<E, BitReader<E>> = (),
    const SRC_CODE: usize = { dsi_bitstream::dispatch::code_consts::GAMMA },
    const DST_CODE: usize = { dsi_bitstream::dispatch::code_consts::GAMMA },
> where
    BitReader<E>: BitRead<E> + CodesRead<E>,
    BitWriter<E>: BitWrite<E> + CodesWrite<E>,
{
    /// Deserializer for the labels
    deserializer: D,
    /// Bitstream to read from
    stream: BitReader<E>,
    /// Length of the iterator (number of triples)
    len: usize,
    /// Current position in the iterator
    current: usize,
    /// Previous source node
    prev_src: usize,
    /// Previous destination node
    prev_dst: usize,
}

unsafe impl<
    E: Endianness,
    D: BitDeserializer<E, BitReader<E>>,
    const SRC_CODE: usize,
    const DST_CODE: usize,
> SortedIterator for GapsIterator<E, D, SRC_CODE, DST_CODE>
where
    BitReader<E>: BitRead<E> + CodesRead<E>,
    BitWriter<E>: BitWrite<E> + CodesWrite<E>,
{
}

impl<
    E: Endianness,
    D: BitDeserializer<E, BitReader<E>>,
    const SRC_CODE: usize,
    const DST_CODE: usize,
> Iterator for GapsIterator<E, D, SRC_CODE, DST_CODE>
where
    BitReader<E>: BitRead<E> + CodesRead<E>,
    BitWriter<E>: BitWrite<E> + CodesWrite<E>,
{
    type Item = ((usize, usize), D::DeserType);

    fn next(&mut self) -> Option<Self::Item> {
        if self.current >= self.len {
            return None;
        }
        let src_gap = ConstCode::<SRC_CODE>.read(&mut self.stream).ok()?;
        let dst_gap = ConstCode::<DST_CODE>.read(&mut self.stream).ok()?;
        let label = self.deserializer.deserialize(&mut self.stream).ok()?;
        self.prev_src += src_gap as usize;
        if src_gap != 0 {
            self.prev_dst = 0;
        }
        self.prev_dst += dst_gap as usize;
        self.current += 1;
        Some(((self.prev_src, self.prev_dst), label))
    }

    fn size_hint(&self) -> (usize, Option<usize>) {
        (self.len(), Some(self.len()))
    }
}

impl<
    E: Endianness,
    D: BitDeserializer<E, BitReader<E>>,
    const SRC_CODE: usize,
    const DST_CODE: usize,
> ExactSizeIterator for GapsIterator<E, D, SRC_CODE, DST_CODE>
where
    BitReader<E>: BitRead<E> + CodesRead<E>,
    BitWriter<E>: BitWrite<E> + CodesWrite<E>,
{
    fn len(&self) -> usize {
        self.len - self.current
    }
}

1	/*
2	* SPDX-FileCopyrightText: 2023 Inria
3	* SPDX-FileCopyrightText: 2023 Sebastiano Vigna
4	* SPDX-FileCopyrightText: 2025 Tommaso Fontana
5	*
6	* SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later
7	*/
8
9	use super::{BitReader, BitWriter};
10	use crate::traits::SortedIterator;
11	use crate::utils::{ArcMmapHelper, MmapHelper, Triple};
12	use crate::{
13	traits::{BitDeserializer, BitSerializer},
14	utils::{BatchCodec, humanize},
15	};
16
17	use std::sync::Arc;
18
19	use anyhow::{Context, Result};
20	use dsi_bitstream::prelude::*;
21	use mmap_rs::MmapFlags;
22	use rdst::*;
23
24	#[derive(Clone, Debug)]
25	/// A codec for encoding and decoding batches of triples using gap compression.
26	///
27	/// This codec encodes triples of the form `(src, dst, label)` by encoding the
28	/// gaps between consecutive sources and destinations using a specified code.
29	///
30	/// # Type Parameters
31	///
32	/// - `S`: Serializer for the labels, implementing [`BitSerializer`] for the label type.
33	/// - `D`: Deserializer for the labels, implementing [`BitDeserializer`] for the label type.
34	/// - `SRC_CODE`: Code used for encoding source gaps (default: gamma).
35	/// - `DST_CODE`: Code used for encoding destination gaps (default: gamma).
36	///
37	/// # Encoding Format
38	///
39	/// 1. The batch length is written using delta coding.
40	/// 2. For each group of triples with the same source:
41	/// - The gap from the previous source is encoded.
42	/// - The gap from the previous destination is encoded.
43	/// - The label is serialized.
44	///
45	/// The bit deserializer must be [`Clone`] because we need one for each
46	/// [`GapsIterator`], and there are possible scenarios in which the
47	/// deserializer might be stateful.
48	pub struct GapsCodec<
49	E: Endianness = NE,
50	S: BitSerializer<E, BitWriter<E>> = (),
51	D: BitDeserializer<E, BitReader<E>, DeserType = S::SerType> + Clone = (),
52	const SRC_CODE: usize = { dsi_bitstream::dispatch::code_consts::GAMMA },
53	const DST_CODE: usize = { dsi_bitstream::dispatch::code_consts::DELTA },
54	> where
55	BitReader<E>: BitRead<E> + CodesRead<E>,
56	BitWriter<E>: BitWrite<E> + CodesWrite<E>,
57	{
58	/// Serializer for the labels
59	pub serializer: S,
60	/// Deserializer for the labels
61	pub deserializer: D,
62	/// Marker for the endianness
63	pub _marker: std::marker::PhantomData<E>,
64	}
65
66	impl<E, S, D, const SRC_CODE: usize, const DST_CODE: usize> GapsCodec<E, S, D, SRC_CODE, DST_CODE>
67	where
68	E: Endianness,
69	S: BitSerializer<E, BitWriter<E>> + Send + Sync,
70	D: BitDeserializer<E, BitReader<E>, DeserType = S::SerType> + Send + Sync + Clone,
71	BitReader<E>: BitRead<E> + CodesRead<E>,
72	BitWriter<E>: BitWrite<E> + CodesWrite<E>,
73	{
74	/// Creates a new `GapsCodec` with the given serializer and deserializer.
75	pub fn new(serializer: S, deserializer: D) -> Self {	4✔
76	Self {
77	serializer,
78	deserializer,
79	_marker: std::marker::PhantomData,
80	}
81	}
82	}
83
84	impl<E, S: Default, D: Default, const SRC_CODE: usize, const DST_CODE: usize> core::default::Default
85	for GapsCodec<E, S, D, SRC_CODE, DST_CODE>
86	where
87	E: Endianness,
88	S: BitSerializer<E, BitWriter<E>> + Send + Sync,
89	D: BitDeserializer<E, BitReader<E>, DeserType = S::SerType> + Send + Sync + Clone,
90	BitReader<E>: BitRead<E> + CodesRead<E>,
91	BitWriter<E>: BitWrite<E> + CodesWrite<E>,
92	{
93	fn default() -> Self {	2✔
94	Self::new(Default::default(), Default::default())	6✔
95	}
96	}
97
98	#[derive(Debug, Clone, Copy)]
99	/// Statistics about the encoding performed by [`GapsCodec`].
100	pub struct GapsStats {
101	/// Total number of triples encoded
102	pub total_triples: usize,
103	/// Number of bits used for source gaps
104	pub src_bits: usize,
105	//// Number of bits used for destination gaps
106	pub dst_bits: usize,
107	/// Number of bits used for labels
108	pub labels_bits: usize,
109	}
110
111	impl core::fmt::Display for GapsStats {
112	fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {	×
113	let total_bits = self.src_bits + self.dst_bits + self.labels_bits;	×
114	write!(	×
115	f,	×
116	"src: {}B ({:.3} bits / arc), dst: {}B ({:.3} bits / arc), labels: {}B ({:.3} bits / arc), total: {}B ({:.3} bits / arc)",
117	humanize(self.src_bits as f64 / 8.0),	×
118	self.src_bits as f64 / self.total_triples as f64,	×
119	humanize(self.dst_bits as f64 / 8.0),	×
120	self.dst_bits as f64 / self.total_triples as f64,	×
121	humanize(self.labels_bits as f64 / 8.0),	×
122	self.labels_bits as f64 / self.total_triples as f64,	×
123	humanize(total_bits as f64 / 8.0),	×
124	total_bits as f64 / self.total_triples as f64,	×
125	)
126	}
127	}
128
129	impl<E, S, D, const SRC_CODE: usize, const DST_CODE: usize> BatchCodec
130	for GapsCodec<E, S, D, SRC_CODE, DST_CODE>
131	where
132	E: Endianness,
133	S: BitSerializer<E, BitWriter<E>> + Send + Sync,
134	D: BitDeserializer<E, BitReader<E>, DeserType = S::SerType> + Send + Sync + Clone,
135	S::SerType: Send + Sync + Copy + 'static + core::fmt::Debug, // needed by radix sort
136	BitReader<E>: BitRead<E> + CodesRead<E>,
137	BitWriter<E>: BitWrite<E> + CodesWrite<E>,
138	{
139	type Label = S::SerType;
140	type DecodedBatch = GapsIterator<E, D, SRC_CODE, DST_CODE>;
141	type EncodedBatchStats = GapsStats;
142
143	fn encode_batch(	8✔
144	&self,
145	path: impl AsRef<std::path::Path>,
146	batch: &mut [((usize, usize), Self::Label)],
147	) -> Result<(usize, Self::EncodedBatchStats)> {
148	let start = std::time::Instant::now();	16✔
149	Triple::cast_batch_mut(batch).radix_sort_unstable();	16✔
150	log::debug!("Sorted {} arcs in {:?}", batch.len(), start.elapsed());	8✔
151	self.encode_sorted_batch(path, batch)	32✔
152	}
153
154	fn encode_sorted_batch(	8✔
155	&self,
156	path: impl AsRef<std::path::Path>,
157	batch: &[((usize, usize), Self::Label)],
158	) -> Result<(usize, Self::EncodedBatchStats)> {
159	debug_assert!(Triple::cast_batch(batch).is_sorted());	24✔
160	// create a bitstream to write to the file
161	let file_path = path.as_ref();	24✔
162	let mut stream = buf_bit_writer::from_path::<E, usize>(file_path).with_context(\|\| {	32✔
NEW 163	format!(	×
NEW 164	"Could not create BatchIterator temporary file {}",	×
NEW 165	file_path.display()	×
166	)
167	})?;
168
169	// prefix the stream with the length of the batch
170	// we use a delta code since it'll be a big number most of the time
171	stream	8✔
172	.write_delta(batch.len() as u64)	16✔
173	.context("Could not write length")?;
174
175	let mut stats = GapsStats {
176	total_triples: batch.len(),	8✔
177	src_bits: 0,
178	dst_bits: 0,
179	labels_bits: 0,
180	};
181	// dump the triples to the bitstrea
182	let (mut prev_src, mut prev_dst) = (0, 0);	24✔
183	for ((src, dst), label) in batch.iter() {	136✔
184	// write the source gap as gamma
185	stats.src_bits += ConstCode::<SRC_CODE>	40✔
186	.write(&mut stream, (src - prev_src) as u64)	120✔
187	.with_context(\|\| format!("Could not write {src} after {prev_src}"))?;	40✔
188	if *src != prev_src {	74✔
189	// Reset prev_y
190	prev_dst = 0;	34✔
191	}
192	// write the destination gap as gamma
193	stats.dst_bits += ConstCode::<DST_CODE>	40✔
194	.write(&mut stream, (dst - prev_dst) as u64)	120✔
195	.with_context(\|\| format!("Could not write {dst} after {prev_dst}"))?;	40✔
196	// write the label
197	stats.labels_bits += self	40✔
198	.serializer	40✔
199	.serialize(label, &mut stream)	120✔
200	.context("Could not serialize label")?;	40✔
201	(prev_src, prev_dst) = (src, dst);	120✔
202	}
203	// flush the stream and reset the buffer
204	stream.flush().context("Could not flush stream")?;	24✔
205
206	let total_bits = stats.src_bits + stats.dst_bits + stats.labels_bits;	16✔
207	Ok((total_bits, stats))	8✔
208	}
209
210	fn decode_batch(&self, path: impl AsRef<std::path::Path>) -> Result<Self::DecodedBatch> {	8✔
211	// open the file
212	let mut stream = <BufBitReader<E, _>>::new(MemWordReader::new(ArcMmapHelper(Arc::new(	32✔
213	MmapHelper::mmap(	8✔
214	path.as_ref(),	16✔
215	MmapFlags::TRANSPARENT_HUGE_PAGES \| MmapFlags::SEQUENTIAL,	8✔
216	)
217	.with_context(\|\| format!("Could not mmap {}", path.as_ref().display()))?,	8✔
218	))));
219
220	// read the length of the batch (first value in the stream)
221	let len = stream.read_delta().context("Could not read length")? as usize;	32✔
222
223	// create the iterator
224	Ok(GapsIterator {	8✔
225	deserializer: self.deserializer.clone(),	24✔
226	stream,	8✔
227	len,	8✔
228	current: 0,	8✔
229	prev_src: 0,	8✔
230	prev_dst: 0,	8✔
231	})
232	}
233	}
234
235	#[derive(Clone, Debug)]
236	/// An iterator over triples encoded with gaps, this is returned by [`GapsCodec`].
237	pub struct GapsIterator<
238	E: Endianness = NE,
239	D: BitDeserializer<E, BitReader<E>> = (),
240	const SRC_CODE: usize = { dsi_bitstream::dispatch::code_consts::GAMMA },
241	const DST_CODE: usize = { dsi_bitstream::dispatch::code_consts::GAMMA },
242	> where
243	BitReader<E>: BitRead<E> + CodesRead<E>,
244	BitWriter<E>: BitWrite<E> + CodesWrite<E>,
245	{
246	/// Deserializer for the labels
247	deserializer: D,
248	/// Bitstream to read from
249	stream: BitReader<E>,
250	/// Length of the iterator (number of triples)
251	len: usize,
252	/// Current position in the iterator
253	current: usize,
254	/// Previous source node
255	prev_src: usize,
256	/// Previous destination node
257	prev_dst: usize,
258	}
259
260	unsafe impl<
261	E: Endianness,
262	D: BitDeserializer<E, BitReader<E>>,
263	const SRC_CODE: usize,
264	const DST_CODE: usize,
265	> SortedIterator for GapsIterator<E, D, SRC_CODE, DST_CODE>
266	where
267	BitReader<E>: BitRead<E> + CodesRead<E>,
268	BitWriter<E>: BitWrite<E> + CodesWrite<E>,
269	{
270	}
271
272	impl<
273	E: Endianness,
274	D: BitDeserializer<E, BitReader<E>>,
275	const SRC_CODE: usize,
276	const DST_CODE: usize,
277	> Iterator for GapsIterator<E, D, SRC_CODE, DST_CODE>
278	where
279	BitReader<E>: BitRead<E> + CodesRead<E>,
280	BitWriter<E>: BitWrite<E> + CodesWrite<E>,
281	{
282	type Item = ((usize, usize), D::DeserType);
283
284	fn next(&mut self) -> Option<Self::Item> {	73✔
285	if self.current >= self.len {	73✔
286	return None;	11✔
287	}
288	let src_gap = ConstCode::<SRC_CODE>.read(&mut self.stream).ok()?;	310✔
289	let dst_gap = ConstCode::<DST_CODE>.read(&mut self.stream).ok()?;	310✔
290	let label = self.deserializer.deserialize(&mut self.stream).ok()?;	310✔
291	self.prev_src += src_gap as usize;	62✔
292	if src_gap != 0 {	118✔
293	self.prev_dst = 0;	56✔
294	}
295	self.prev_dst += dst_gap as usize;	62✔
296	self.current += 1;	62✔
297	Some(((self.prev_src, self.prev_dst), label))	62✔
298	}
299
300	fn size_hint(&self) -> (usize, Option<usize>) {	×
301	(self.len(), Some(self.len()))	×
302	}
303	}
304
305	impl<
306	E: Endianness,
307	D: BitDeserializer<E, BitReader<E>>,
308	const SRC_CODE: usize,
309	const DST_CODE: usize,
310	> ExactSizeIterator for GapsIterator<E, D, SRC_CODE, DST_CODE>
311	where
312	BitReader<E>: BitRead<E> + CodesRead<E>,
313	BitWriter<E>: BitWrite<E> + CodesWrite<E>,
314	{
315	fn len(&self) -> usize {	×
316	self.len - self.current	×
317	}
318	}

vigna / webgraph-rs / 20027970177

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