Mercurial > public > mercurial-scm > hg
annotate rust/hg-core/src/revlog/index.rs @ 46568:0d840b9d200d
copies-rust: track "overwrites" directly within CopySource
Overwrite are "rare enough" that explicitly keeping track of them is going to be
"cheap", or at least much cheaper that issuing many `is_ancestor` calls.
Even a simple implementation using no specific optimisation (eg: using the
generic HashSet type) yield good result in most cases.
They are interesting optimization to can do on top of that. We will implement
them in later changesets.
We tried different approach to speed up the overwrite detection and this one
seems the most promising. Without further optimization, we already see sizable
speedup on various cases.
Repo Case Source-Rev Dest-Rev # of revisions old time new time Difference Factor time per rev
---------------------------------------------------------------------------------------------------------------------------------------------------------------
mozilla-try x00000_revs_x_added_0_copies 6a320851d377 1ebb79acd503 : 363753 revs, 5.138169 s, 4.482399 s, -0.655770 s, ? 0.8724, 12 ?s/rev
mozilla-try x00000_revs_x_added_x_copies 5173c4b6f97c 95d83ee7242d : 362229 revs, 5.127809 s, 4.480366 s, -0.647443 s, ? 0.8737, 12 ?s/rev
mozilla-try x00000_revs_x000_added_x_copies 9126823d0e9c ca82787bb23c : 359344 revs, 4.971136 s, 4.369070 s, -0.602066 s, ? 0.8789, 12 ?s/rev
mozilla-try x00000_revs_x0000_added_x0000_copies 8d3fafa80d4b eb884023b810 : 192665 revs, 1.741678 s, 1.592506 s, -0.149172 s, ? 0.9144, 8 ?s/rev
However, some of the case doing a lot of overwrite get significantly slower.
The one with a really problematic slowdown are the special "head reducing" merge
in mozilla-try so I am not too worried about them. In addition, further
changeset are going to improve the performance of all this.
Repo Case Source-Rev Dest-Rev # of revisions old time new time Difference Factor time per rev
---------------------------------------------------------------------------------------------------------------------------------------------------------------
mozilla-try x0000_revs_xx000_added_x000_copies 89294cd501d9 7ccb2fc7ccb5 : 97052 revs, 1.343373 s, 2.119204 s, +0.775831 s, ? 1.5775, 21 ?s/rev
mozilla-try x00000_revs_x00000_added_x0000_copies 1b661134e2ca 1ae03d022d6d : 228985 revs, 40.314822 s, 87.824489 s, +47.509667 s, ? 2.1785, 383 ?s/rev
mozilla-try x00000_revs_x00000_added_x000_copies 9b2a99adc05e 8e29777b48e6 : 382065 revs, 20.048029 s, 43.304637 s, +23.256608 s, ? 2.1600, 113 ?s/rev
Full benchmark below:
Repo Case Source-Rev Dest-Rev # of revisions old time new time Difference Factor time per rev
---------------------------------------------------------------------------------------------------------------------------------------------------------------
mercurial x_revs_x_added_0_copies ad6b123de1c7 39cfcef4f463 : 1 revs, 0.000042 s, 0.000043 s, +0.000001 s, ? 1.0238, 43 ?s/rev
mercurial x_revs_x_added_x_copies 2b1c78674230 0c1d10351869 : 6 revs, 0.000110 s, 0.000114 s, +0.000004 s, ? 1.0364, 19 ?s/rev
mercurial x000_revs_x000_added_x_copies 81f8ff2a9bf2 dd3267698d84 : 1032 revs, 0.004945 s, 0.004937 s, -0.000008 s, ? 0.9984, 4 ?s/rev
pypy x_revs_x_added_0_copies aed021ee8ae8 099ed31b181b : 9 revs, 0.000192 s, 0.000339 s, +0.000147 s, ? 1.7656, 37 ?s/rev
pypy x_revs_x000_added_0_copies 4aa4e1f8e19a 359343b9ac0e : 1 revs, 0.000049 s, 0.000049 s, +0.000000 s, ? 1.0000, 49 ?s/rev
pypy x_revs_x_added_x_copies ac52eb7bbbb0 72e022663155 : 7 revs, 0.000112 s, 0.000202 s, +0.000090 s, ? 1.8036, 28 ?s/rev
pypy x_revs_x00_added_x_copies c3b14617fbd7 ace7255d9a26 : 1 revs, 0.000323 s, 0.000409 s, +0.000086 s, ? 1.2663, 409 ?s/rev
pypy x_revs_x000_added_x000_copies df6f7a526b60 a83dc6a2d56f : 6 revs, 0.010042 s, 0.011984 s, +0.001942 s, ? 1.1934, 1997 ?s/rev
pypy x000_revs_xx00_added_0_copies 89a76aede314 2f22446ff07e : 4785 revs, 0.049813 s, 0.050820 s, +0.001007 s, ? 1.0202, 10 ?s/rev
pypy x000_revs_x000_added_x_copies 8a3b5bfd266e 2c68e87c3efe : 6780 revs, 0.079937 s, 0.087953 s, +0.008016 s, ? 1.1003, 12 ?s/rev
pypy x000_revs_x000_added_x000_copies 89a76aede314 7b3dda341c84 : 5441 revs, 0.059412 s, 0.062902 s, +0.003490 s, ? 1.0587, 11 ?s/rev
pypy x0000_revs_x_added_0_copies d1defd0dc478 c9cb1334cc78 : 43645 revs, 0.533769 s, 0.679234 s, +0.145465 s, ? 1.2725, 15 ?s/rev
pypy x0000_revs_xx000_added_0_copies bf2c629d0071 4ffed77c095c : 2 revs, 0.013147 s, 0.013095 s, -0.000052 s, ? 0.9960, 6547 ?s/rev
pypy x0000_revs_xx000_added_x000_copies 08ea3258278e d9fa043f30c0 : 11316 revs, 0.110680 s, 0.120910 s, +0.010230 s, ? 1.0924, 10 ?s/rev
netbeans x_revs_x_added_0_copies fb0955ffcbcd a01e9239f9e7 : 2 revs, 0.000085 s, 0.000087 s, +0.000002 s, ? 1.0235, 43 ?s/rev
netbeans x_revs_x000_added_0_copies 6f360122949f 20eb231cc7d0 : 2 revs, 0.000107 s, 0.000107 s, +0.000000 s, ? 1.0000, 53 ?s/rev
netbeans x_revs_x_added_x_copies 1ada3faf6fb6 5a39d12eecf4 : 3 revs, 0.000175 s, 0.000186 s, +0.000011 s, ? 1.0629, 62 ?s/rev
netbeans x_revs_x00_added_x_copies 35be93ba1e2c 9eec5e90c05f : 9 revs, 0.000720 s, 0.000754 s, +0.000034 s, ? 1.0472, 83 ?s/rev
netbeans x000_revs_xx00_added_0_copies eac3045b4fdd 51d4ae7f1290 : 1421 revs, 0.010019 s, 0.010443 s, +0.000424 s, ? 1.0423, 7 ?s/rev
netbeans x000_revs_x000_added_x_copies e2063d266acd 6081d72689dc : 1533 revs, 0.015602 s, 0.015697 s, +0.000095 s, ? 1.0061, 10 ?s/rev
netbeans x000_revs_x000_added_x000_copies ff453e9fee32 411350406ec2 : 5750 revs, 0.058759 s, 0.063528 s, +0.004769 s, ? 1.0812, 11 ?s/rev
netbeans x0000_revs_xx000_added_x000_copies 588c2d1ced70 1aad62e59ddd : 66949 revs, 0.491550 s, 0.545515 s, +0.053965 s, ? 1.1098, 8 ?s/rev
mozilla-central x_revs_x_added_0_copies 3697f962bb7b 7015fcdd43a2 : 2 revs, 0.000087 s, 0.000089 s, +0.000002 s, ? 1.0230, 44 ?s/rev
mozilla-central x_revs_x000_added_0_copies dd390860c6c9 40d0c5bed75d : 8 revs, 0.000268 s, 0.000265 s, -0.000003 s, ? 0.9888, 33 ?s/rev
mozilla-central x_revs_x_added_x_copies 8d198483ae3b 14207ffc2b2f : 9 revs, 0.000181 s, 0.000381 s, +0.000200 s, ? 2.1050, 42 ?s/rev
mozilla-central x_revs_x00_added_x_copies 98cbc58cc6bc 446a150332c3 : 7 revs, 0.000661 s, 0.000672 s, +0.000011 s, ? 1.0166, 96 ?s/rev
mozilla-central x_revs_x000_added_x000_copies 3c684b4b8f68 0a5e72d1b479 : 3 revs, 0.003256 s, 0.003497 s, +0.000241 s, ? 1.0740, 1165 ?s/rev
mozilla-central x_revs_x0000_added_x0000_copies effb563bb7e5 c07a39dc4e80 : 6 revs, 0.066749 s, 0.073204 s, +0.006455 s, ? 1.0967, 12200 ?s/rev
mozilla-central x000_revs_xx00_added_0_copies 6100d773079a 04a55431795e : 1593 revs, 0.006462 s, 0.006482 s, +0.000020 s, ? 1.0031, 4 ?s/rev
mozilla-central x000_revs_x000_added_x_copies 9f17a6fc04f9 2d37b966abed : 41 revs, 0.004919 s, 0.005066 s, +0.000147 s, ? 1.0299, 123 ?s/rev
mozilla-central x000_revs_x000_added_x000_copies 7c97034feb78 4407bd0c6330 : 7839 revs, 0.062421 s, 0.065707 s, +0.003286 s, ? 1.0526, 8 ?s/rev
mozilla-central x0000_revs_xx000_added_0_copies 9eec5917337d 67118cc6dcad : 615 revs, 0.026633 s, 0.026800 s, +0.000167 s, ? 1.0063, 43 ?s/rev
mozilla-central x0000_revs_xx000_added_x000_copies f78c615a656c 96a38b690156 : 30263 revs, 0.197792 s, 0.203856 s, +0.006064 s, ? 1.0307, 6 ?s/rev
mozilla-central x00000_revs_x0000_added_x0000_copies 6832ae71433c 4c222a1d9a00 : 153721 revs, 1.259970 s, 1.293394 s, +0.033424 s, ? 1.0265, 8 ?s/rev
mozilla-central x00000_revs_x00000_added_x000_copies 76caed42cf7c 1daa622bbe42 : 204976 revs, 1.689184 s, 1.698239 s, +0.009055 s, ? 1.0054, 8 ?s/rev
mozilla-try x_revs_x_added_0_copies aaf6dde0deb8 9790f499805a : 2 revs, 0.000865 s, 0.000875 s, +0.000010 s, ? 1.0116, 437 ?s/rev
mozilla-try x_revs_x000_added_0_copies d8d0222927b4 5bb8ce8c7450 : 2 revs, 0.000893 s, 0.000891 s, -0.000002 s, ? 0.9978, 445 ?s/rev
mozilla-try x_revs_x_added_x_copies 092fcca11bdb 936255a0384a : 4 revs, 0.000172 s, 0.000292 s, +0.000120 s, ? 1.6977, 73 ?s/rev
mozilla-try x_revs_x00_added_x_copies b53d2fadbdb5 017afae788ec : 2 revs, 0.001159 s, 0.003939 s, +0.002780 s, ? 3.3986, 1969 ?s/rev
mozilla-try x_revs_x000_added_x000_copies 20408ad61ce5 6f0ee96e21ad : 1 revs, 0.031621 s, 0.033027 s, +0.001406 s, ? 1.0445, 33027 ?s/rev
mozilla-try x_revs_x0000_added_x0000_copies effb563bb7e5 c07a39dc4e80 : 6 revs, 0.068571 s, 0.073703 s, +0.005132 s, ? 1.0748, 12283 ?s/rev
mozilla-try x000_revs_xx00_added_0_copies 6100d773079a 04a55431795e : 1593 revs, 0.006452 s, 0.006469 s, +0.000017 s, ? 1.0026, 4 ?s/rev
mozilla-try x000_revs_x000_added_x_copies 9f17a6fc04f9 2d37b966abed : 41 revs, 0.005443 s, 0.005278 s, -0.000165 s, ? 0.9697, 128 ?s/rev
mozilla-try x000_revs_x000_added_x000_copies 1346fd0130e4 4c65cbdabc1f : 6657 revs, 0.063180 s, 0.064995 s, +0.001815 s, ? 1.0287, 9 ?s/rev
mozilla-try x0000_revs_x_added_0_copies 63519bfd42ee a36a2a865d92 : 40314 revs, 0.293564 s, 0.301041 s, +0.007477 s, ? 1.0255, 7 ?s/rev
mozilla-try x0000_revs_x_added_x_copies 9fe69ff0762d bcabf2a78927 : 38690 revs, 0.286595 s, 0.285575 s, -0.001020 s, ? 0.9964, 7 ?s/rev
mozilla-try x0000_revs_xx000_added_x_copies 156f6e2674f2 4d0f2c178e66 : 8598 revs, 0.083256 s, 0.085597 s, +0.002341 s, ? 1.0281, 9 ?s/rev
mozilla-try x0000_revs_xx000_added_0_copies 9eec5917337d 67118cc6dcad : 615 revs, 0.027282 s, 0.027118 s, -0.000164 s, ? 0.9940, 44 ?s/rev
mozilla-try x0000_revs_xx000_added_x000_copies 89294cd501d9 7ccb2fc7ccb5 : 97052 revs, 1.343373 s, 2.119204 s, +0.775831 s, ? 1.5775, 21 ?s/rev
mozilla-try x0000_revs_x0000_added_x0000_copies e928c65095ed e951f4ad123a : 52031 revs, 0.665737 s, 0.701479 s, +0.035742 s, ? 1.0537, 13 ?s/rev
mozilla-try x00000_revs_x_added_0_copies 6a320851d377 1ebb79acd503 : 363753 revs, 5.138169 s, 4.482399 s, -0.655770 s, ? 0.8724, 12 ?s/rev
mozilla-try x00000_revs_x00000_added_0_copies dc8a3ca7010e d16fde900c9c : 34414 revs, 0.573276 s, 0.574082 s, +0.000806 s, ? 1.0014, 16 ?s/rev
mozilla-try x00000_revs_x_added_x_copies 5173c4b6f97c 95d83ee7242d : 362229 revs, 5.127809 s, 4.480366 s, -0.647443 s, ? 0.8737, 12 ?s/rev
mozilla-try x00000_revs_x000_added_x_copies 9126823d0e9c ca82787bb23c : 359344 revs, 4.971136 s, 4.369070 s, -0.602066 s, ? 0.8789, 12 ?s/rev
mozilla-try x00000_revs_x0000_added_x0000_copies 8d3fafa80d4b eb884023b810 : 192665 revs, 1.741678 s, 1.592506 s, -0.149172 s, ? 0.9144, 8 ?s/rev
mozilla-try x00000_revs_x00000_added_x0000_copies 1b661134e2ca 1ae03d022d6d : 228985 revs, 40.314822 s, 87.824489 s, +47.509667 s, ? 2.1785, 383 ?s/rev
mozilla-try x00000_revs_x00000_added_x000_copies 9b2a99adc05e 8e29777b48e6 : 382065 revs, 20.048029 s, 43.304637 s, +23.256608 s, ? 2.1600, 113 ?s/rev
private : 459513 revs, 37.179470 s, 33.853687 s, -3.325783 s, ? 0.9105, 73 ?s/rev
Differential Revision: https://phab.mercurial-scm.org/D9644
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
---|---|
date | Tue, 15 Dec 2020 18:04:23 +0100 |
parents | 43d63979a75e |
children | 6d5a26e94d9e |
rev | line source |
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1 use std::convert::TryInto; |
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2 use std::ops::Deref; |
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3 |
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4 use byteorder::{BigEndian, ByteOrder}; |
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5 |
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6 use crate::errors::HgError; |
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7 use crate::revlog::node::Node; |
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8 use crate::revlog::revlog::RevlogError; |
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9 use crate::revlog::{Revision, NULL_REVISION}; |
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10 |
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11 pub const INDEX_ENTRY_SIZE: usize = 64; |
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12 |
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13 /// A Revlog index |
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14 pub struct Index { |
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15 bytes: Box<dyn Deref<Target = [u8]> + Send>, |
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16 /// Offsets of starts of index blocks. |
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17 /// Only needed when the index is interleaved with data. |
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18 offsets: Option<Vec<usize>>, |
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19 } |
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20 |
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21 impl Index { |
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22 /// Create an index from bytes. |
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23 /// Calculate the start of each entry when is_inline is true. |
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24 pub fn new( |
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25 bytes: Box<dyn Deref<Target = [u8]> + Send>, |
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26 ) -> Result<Self, RevlogError> { |
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27 if is_inline(&bytes) { |
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28 let mut offset: usize = 0; |
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29 let mut offsets = Vec::new(); |
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30 |
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31 while offset + INDEX_ENTRY_SIZE <= bytes.len() { |
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32 offsets.push(offset); |
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33 let end = offset + INDEX_ENTRY_SIZE; |
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34 let entry = IndexEntry { |
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35 bytes: &bytes[offset..end], |
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36 offset_override: None, |
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37 }; |
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38 |
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39 offset += INDEX_ENTRY_SIZE + entry.compressed_len(); |
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40 } |
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41 |
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42 if offset == bytes.len() { |
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43 Ok(Self { |
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44 bytes, |
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45 offsets: Some(offsets), |
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46 }) |
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47 } else { |
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48 Err(HgError::corrupted("unexpected inline revlog length") |
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49 .into()) |
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50 } |
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51 } else { |
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52 Ok(Self { |
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53 bytes, |
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54 offsets: None, |
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55 }) |
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56 } |
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57 } |
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58 |
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59 /// Value of the inline flag. |
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60 pub fn is_inline(&self) -> bool { |
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61 is_inline(&self.bytes) |
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62 } |
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63 |
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64 /// Return a slice of bytes if `revlog` is inline. Panic if not. |
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65 pub fn data(&self, start: usize, end: usize) -> &[u8] { |
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66 if !self.is_inline() { |
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67 panic!("tried to access data in the index of a revlog that is not inline"); |
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68 } |
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69 &self.bytes[start..end] |
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70 } |
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71 |
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72 /// Return number of entries of the revlog index. |
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73 pub fn len(&self) -> usize { |
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74 if let Some(offsets) = &self.offsets { |
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75 offsets.len() |
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76 } else { |
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77 self.bytes.len() / INDEX_ENTRY_SIZE |
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78 } |
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79 } |
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80 |
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81 /// Returns `true` if the `Index` has zero `entries`. |
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82 pub fn is_empty(&self) -> bool { |
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83 self.len() == 0 |
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84 } |
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85 |
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86 /// Return the index entry corresponding to the given revision if it |
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87 /// exists. |
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88 pub fn get_entry(&self, rev: Revision) -> Option<IndexEntry> { |
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89 if rev == NULL_REVISION { |
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90 return None; |
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91 } |
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92 if let Some(offsets) = &self.offsets { |
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93 self.get_entry_inline(rev, offsets) |
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94 } else { |
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95 self.get_entry_separated(rev) |
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96 } |
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97 } |
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98 |
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99 fn get_entry_inline( |
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100 &self, |
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101 rev: Revision, |
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102 offsets: &[usize], |
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103 ) -> Option<IndexEntry> { |
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104 let start = *offsets.get(rev as usize)?; |
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105 let end = start.checked_add(INDEX_ENTRY_SIZE)?; |
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106 let bytes = &self.bytes[start..end]; |
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107 |
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108 // See IndexEntry for an explanation of this override. |
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109 let offset_override = Some(end); |
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110 |
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111 Some(IndexEntry { |
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112 bytes, |
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113 offset_override, |
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114 }) |
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115 } |
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116 |
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117 fn get_entry_separated(&self, rev: Revision) -> Option<IndexEntry> { |
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118 let max_rev = self.bytes.len() / INDEX_ENTRY_SIZE; |
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119 if rev as usize >= max_rev { |
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120 return None; |
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121 } |
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122 let start = rev as usize * INDEX_ENTRY_SIZE; |
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123 let end = start + INDEX_ENTRY_SIZE; |
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124 let bytes = &self.bytes[start..end]; |
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125 |
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126 // Override the offset of the first revision as its bytes are used |
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127 // for the index's metadata (saving space because it is always 0) |
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128 let offset_override = if rev == 0 { Some(0) } else { None }; |
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129 |
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130 Some(IndexEntry { |
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131 bytes, |
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132 offset_override, |
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133 }) |
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134 } |
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135 } |
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136 |
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137 impl super::RevlogIndex for Index { |
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138 fn len(&self) -> usize { |
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139 self.len() |
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140 } |
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141 |
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142 fn node(&self, rev: Revision) -> Option<&Node> { |
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143 self.get_entry(rev).map(|entry| entry.hash()) |
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144 } |
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145 } |
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146 |
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147 #[derive(Debug)] |
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148 pub struct IndexEntry<'a> { |
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149 bytes: &'a [u8], |
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150 /// Allows to override the offset value of the entry. |
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151 /// |
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152 /// For interleaved index and data, the offset stored in the index |
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153 /// corresponds to the separated data offset. |
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154 /// It has to be overridden with the actual offset in the interleaved |
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155 /// index which is just after the index block. |
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156 /// |
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157 /// For separated index and data, the offset stored in the first index |
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158 /// entry is mixed with the index headers. |
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159 /// It has to be overridden with 0. |
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160 offset_override: Option<usize>, |
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161 } |
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162 |
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163 impl<'a> IndexEntry<'a> { |
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164 /// Return the offset of the data. |
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165 pub fn offset(&self) -> usize { |
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166 if let Some(offset_override) = self.offset_override { |
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167 offset_override |
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168 } else { |
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169 let mut bytes = [0; 8]; |
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170 bytes[2..8].copy_from_slice(&self.bytes[0..=5]); |
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171 BigEndian::read_u64(&bytes[..]) as usize |
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172 } |
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173 } |
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174 |
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175 /// Return the compressed length of the data. |
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176 pub fn compressed_len(&self) -> usize { |
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177 BigEndian::read_u32(&self.bytes[8..=11]) as usize |
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178 } |
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179 |
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180 /// Return the uncompressed length of the data. |
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181 pub fn uncompressed_len(&self) -> usize { |
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182 BigEndian::read_u32(&self.bytes[12..=15]) as usize |
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183 } |
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184 |
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185 /// Return the revision upon which the data has been derived. |
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186 pub fn base_revision(&self) -> Revision { |
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187 // TODO Maybe return an Option when base_revision == rev? |
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188 // Requires to add rev to IndexEntry |
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189 |
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190 BigEndian::read_i32(&self.bytes[16..]) |
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191 } |
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192 |
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193 pub fn p1(&self) -> Revision { |
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194 BigEndian::read_i32(&self.bytes[24..]) |
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195 } |
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196 |
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197 pub fn p2(&self) -> Revision { |
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198 BigEndian::read_i32(&self.bytes[28..]) |
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199 } |
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200 |
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201 /// Return the hash of revision's full text. |
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202 /// |
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203 /// Currently, SHA-1 is used and only the first 20 bytes of this field |
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204 /// are used. |
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205 pub fn hash(&self) -> &'a Node { |
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206 (&self.bytes[32..52]).try_into().unwrap() |
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207 } |
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208 } |
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209 |
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210 /// Value of the inline flag. |
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211 pub fn is_inline(index_bytes: &[u8]) -> bool { |
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212 match &index_bytes[0..=1] { |
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213 [0, 0] | [0, 2] => false, |
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214 _ => true, |
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215 } |
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216 } |
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217 |
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218 #[cfg(test)] |
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219 mod tests { |
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220 use super::*; |
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221 |
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222 #[cfg(test)] |
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223 #[derive(Debug, Copy, Clone)] |
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224 pub struct IndexEntryBuilder { |
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225 is_first: bool, |
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226 is_inline: bool, |
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227 is_general_delta: bool, |
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228 version: u16, |
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229 offset: usize, |
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230 compressed_len: usize, |
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231 uncompressed_len: usize, |
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232 base_revision: Revision, |
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233 } |
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234 |
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235 #[cfg(test)] |
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236 impl IndexEntryBuilder { |
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237 pub fn new() -> Self { |
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238 Self { |
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239 is_first: false, |
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240 is_inline: false, |
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241 is_general_delta: true, |
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242 version: 2, |
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243 offset: 0, |
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244 compressed_len: 0, |
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245 uncompressed_len: 0, |
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246 base_revision: 0, |
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247 } |
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248 } |
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249 |
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250 pub fn is_first(&mut self, value: bool) -> &mut Self { |
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251 self.is_first = value; |
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252 self |
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253 } |
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254 |
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255 pub fn with_inline(&mut self, value: bool) -> &mut Self { |
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256 self.is_inline = value; |
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257 self |
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258 } |
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259 |
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260 pub fn with_general_delta(&mut self, value: bool) -> &mut Self { |
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261 self.is_general_delta = value; |
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262 self |
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263 } |
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264 |
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265 pub fn with_version(&mut self, value: u16) -> &mut Self { |
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266 self.version = value; |
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267 self |
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268 } |
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269 |
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270 pub fn with_offset(&mut self, value: usize) -> &mut Self { |
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271 self.offset = value; |
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272 self |
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273 } |
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274 |
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275 pub fn with_compressed_len(&mut self, value: usize) -> &mut Self { |
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276 self.compressed_len = value; |
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277 self |
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278 } |
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279 |
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280 pub fn with_uncompressed_len(&mut self, value: usize) -> &mut Self { |
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281 self.uncompressed_len = value; |
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282 self |
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283 } |
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284 |
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285 pub fn with_base_revision(&mut self, value: Revision) -> &mut Self { |
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286 self.base_revision = value; |
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287 self |
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288 } |
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289 |
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290 pub fn build(&self) -> Vec<u8> { |
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291 let mut bytes = Vec::with_capacity(INDEX_ENTRY_SIZE); |
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292 if self.is_first { |
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293 bytes.extend(&match (self.is_general_delta, self.is_inline) { |
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294 (false, false) => [0u8, 0], |
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295 (false, true) => [0u8, 1], |
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296 (true, false) => [0u8, 2], |
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297 (true, true) => [0u8, 3], |
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298 }); |
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299 bytes.extend(&self.version.to_be_bytes()); |
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300 // Remaining offset bytes. |
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301 bytes.extend(&[0u8; 2]); |
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302 } else { |
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303 // Offset is only 6 bytes will usize is 8. |
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304 bytes.extend(&self.offset.to_be_bytes()[2..]); |
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305 } |
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306 bytes.extend(&[0u8; 2]); // Revision flags. |
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307 bytes.extend(&self.compressed_len.to_be_bytes()[4..]); |
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308 bytes.extend(&self.uncompressed_len.to_be_bytes()[4..]); |
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309 bytes.extend(&self.base_revision.to_be_bytes()); |
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310 bytes |
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311 } |
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312 } |
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313 |
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314 #[test] |
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315 fn is_not_inline_when_no_inline_flag_test() { |
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316 let bytes = IndexEntryBuilder::new() |
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317 .is_first(true) |
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318 .with_general_delta(false) |
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319 .with_inline(false) |
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320 .build(); |
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321 |
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322 assert_eq!(is_inline(&bytes), false) |
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323 } |
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324 |
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325 #[test] |
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326 fn is_inline_when_inline_flag_test() { |
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327 let bytes = IndexEntryBuilder::new() |
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328 .is_first(true) |
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329 .with_general_delta(false) |
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330 .with_inline(true) |
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331 .build(); |
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332 |
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333 assert_eq!(is_inline(&bytes), true) |
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334 } |
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335 |
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336 #[test] |
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337 fn is_inline_when_inline_and_generaldelta_flags_test() { |
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338 let bytes = IndexEntryBuilder::new() |
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339 .is_first(true) |
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340 .with_general_delta(true) |
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341 .with_inline(true) |
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342 .build(); |
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343 |
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344 assert_eq!(is_inline(&bytes), true) |
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345 } |
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346 |
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347 #[test] |
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348 fn test_offset() { |
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349 let bytes = IndexEntryBuilder::new().with_offset(1).build(); |
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350 let entry = IndexEntry { |
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351 bytes: &bytes, |
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352 offset_override: None, |
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353 }; |
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354 |
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355 assert_eq!(entry.offset(), 1) |
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356 } |
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357 |
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358 #[test] |
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359 fn test_with_overridden_offset() { |
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360 let bytes = IndexEntryBuilder::new().with_offset(1).build(); |
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361 let entry = IndexEntry { |
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362 bytes: &bytes, |
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363 offset_override: Some(2), |
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364 }; |
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365 |
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366 assert_eq!(entry.offset(), 2) |
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367 } |
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368 |
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369 #[test] |
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370 fn test_compressed_len() { |
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371 let bytes = IndexEntryBuilder::new().with_compressed_len(1).build(); |
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372 let entry = IndexEntry { |
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373 bytes: &bytes, |
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374 offset_override: None, |
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375 }; |
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376 |
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377 assert_eq!(entry.compressed_len(), 1) |
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378 } |
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379 |
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380 #[test] |
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381 fn test_uncompressed_len() { |
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382 let bytes = IndexEntryBuilder::new().with_uncompressed_len(1).build(); |
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383 let entry = IndexEntry { |
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384 bytes: &bytes, |
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385 offset_override: None, |
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386 }; |
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387 |
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388 assert_eq!(entry.uncompressed_len(), 1) |
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389 } |
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390 |
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391 #[test] |
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392 fn test_base_revision() { |
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393 let bytes = IndexEntryBuilder::new().with_base_revision(1).build(); |
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394 let entry = IndexEntry { |
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395 bytes: &bytes, |
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396 offset_override: None, |
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397 }; |
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398 |
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399 assert_eq!(entry.base_revision(), 1) |
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400 } |
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401 } |
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402 |
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403 #[cfg(test)] |
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404 pub use tests::IndexEntryBuilder; |