105 lines
12 KiB
Plaintext
105 lines
12 KiB
Plaintext
|
!<arch>
|
|||
|
|
/ 0 0 0 0 8 `
|
|||
|
|
// 56 `
|
|||
|
|
fnv-ccb7f141a4e4be6c.fnv.54db1d7ae37522e4-cgu.0.rcgu.o/
|
|||
|
|
lib.rmeta/ 0 0 0 644 11368 `
|
|||
|
|
ELF · è* @ @ GNU À rust
|
|||
|
|
( #rustc 1.96.0 (ac68faa20 2026-05-25)ÁÀ뉊 ]!ÜÛê(¹Þ—šên -5be7b69c3ff7b5b8Á íàÄTËŸ ÜJîÄ)'ß\¥! -3d1337db07d0b3aeÁ ¤²XctÔ'ÐÓ©z¨É½Ó -a4945860e1c53b00Á ¤°ð ¾ä-±($²ï=©Ã -7e98a21bfd32b0edÁ–�òÖÀH•‘P IÓHã#£ -055f30b747f859b6Á rustc_std_workspace_coreÁCçß^ò½èÝ$Çÿ+Cé -c4878ee60b2242c9Á ŸÃï+Ñ]ŠqB<ÏïW# -8dd1dd90e70d0b6aÁ miniz_oxideÁ€š»J(P>àö÷g\K -1eb618da2918ab7fÁ adler2ÁÆ;+Þ®5¥ÌýÝ°¦ÛLˆ -f7919172d268e069Á hashbrownÁPäV9ÒÆèÜ�"ÊÖVŽ\ -0fc2184a5da6723aÁ rustc_std_workspace_allocÁs&ØòØy¯s•bæ!‰ýŠ -97e4bf30be240674Á
|
|||
|
|
std_detectÁhŠBîÙºÌI®Ë�Å�š -9dbbf8346ba7ac8bÁ rustc_demangleÁûë9´Ç×@Œ�’ùXFº -f33013f239bf9f14Á cfg_ifÁÜLh�ž§Œaã¯>� -0a71c8f33a838301Á addr2lineÁ׎Þ!]8V$É@@T· -e618e6be60e87ba2Á gimliÁ¸
|
|||
|
|
°µ~Î1‹Ñt ðÁ€w -1f7768a68858f670Á objectÁ
|
|||
|
|
áPÃ?À¶¼QHJ¥� -914cd6a4dbe590d1Á memchrÁ›º«8Ór2Ù $¨ûib‚ -cf21ca6f2bb15dcdÁë
|
|||
|
|
‹ás «LÖ€îâƒ×ɯŒ -ee6f3747e38367f0Á ¤,¨ »À|� Œ€ q<š »À|ô Œó ‘4Ñ »À| Œ¬ BuildHasherDefaultÁ”Ù »À-+- ‚$Ú ‚ $Ï À FnvHasherÁ
|
|||
|
|
|
|||
|
|
|
|||
|
|
ˆ
|
|||
|
|
> with_keyÁ finishÁ writeÁ FnvBuildHasherÁ
|
|||
|
|
FnvHashMapÁ œ §
|
|||
|
|
FnvHashSetÁ ¥
|
|||
|
|
|
|||
|
|
|
|||
|
|
³
|
|||
|
|
|
|||
|
|
ý ˆ G2¨cïý—ô ¢e«
|
|||
|
|
|
|||
|
|
|
|||
|
|
³
|
|||
|
|
¢eì‰
|
|||
|
|
”“ %#"„äœòË ¬ üåG « Lõ tà
|
|||
|
|
ô ü¯E « LÌ � ¿ keyÁ 0 4È � Ô ü¦. � º « ,° / D¢ � dÊ $Ð
|
|||
|
|
“t ,Ê 4Ð `Ê
|
|||
|
|
ÊLÄlÄl IterÁ Çlµ ™l Èl
|
|||
|
|
end_or_lenÁ™l Él _markerÁ™l ŒœjSž Å ¢ ~ ‚ ø¾ƒ › ª¯
|
|||
|
|
ûMð À È Ì Ø ê $Â
|
|||
|
|
Û Å $ì ,ô
|
|||
|
|
|
|||
|
|
tó
|
|||
|
|
� äå $– ü– d›
|
|||
|
|
Ó (l¨ ³ � Ü› $Ý |Ó
|
|||
|
|
¼Ë é ü�' M üè� ü”Õ o v ‰ « Lñ
|
|||
|
|
Å ,ü � t ð < ð p ð Lۼݼ޼© ß¼ à¼ÛἈ cSñŸ«‡zÙá ™ ð ¤ á Ä� ² � Ÿ Å µ � � – « E � Z Ø bytesÁÝ §U ù! byteÁA
|
|||
|
|
O ¿p êJ ‘P Á ¤™
|
|||
|
|
# « . � 5 <
|
|||
|
|
À q<Ú ³ q µ ‘4‹ ¢e •”“ Êe �<× ð �<à ¡
|
|||
|
|
ü ê• ü H E An implementation of the [Fowler–Noll–Vo hash function][chongo].Á I ú dM ## AboutÁ Z ú ü^J G The FNV hash function is a custom `Hasher` implementation that is moreÁ ü©$ ! efficient for smaller hash keys.Á Î ú üÒN K [The Rust FAQ states that][faq] while the default `Hasher` implementation,Á ü¡N K SipHash, is good in many cases, it is notably slower than other algorithmsÁ üðM J with short keys, such as when you have a map of integers to other values.Á ü¾> ; In cases like these, [FNV is demonstrably faster][graphs].Á ý ú ü�F C Its disadvantages are that it performs badly on larger inputs, andÁ üÈL I provides no protection against collision attacks, where a malicious userÁ ü•G D can craft specific keys designed to slow a hasher down. Thus, it isÁ üÝM J important to profile your program to ensure that you are using small hashÁ ü«L I keys, and be certain that your program could not be exposed to maliciousÁ üø0 - inputs (including being a networked server).Á © ú üA > The Rust compiler itself uses FNV, as it is not worried aboutÁ üïM J denial-of-service attacks, and can assume that its inputs are going to beÁ ü½' $ small—a perfect use case for FNV.Á å ú üŒ é ü† ï ä
|
|||
|
|
|
|||
|
|
## Using FNV in a `HashMap`
|
|||
|
|
|
|||
|
|
The `FnvHashMap` type alias is the easiest way to use the standard library’s
|
|||
|
|
`HashMap` with FNV.
|
|||
|
|
|
|||
|
|
```rust
|
|||
|
|
use fnv::FnvHashMap;
|
|||
|
|
|
|||
|
|
let mut map = FnvHashMap::default();
|
|||
|
|
map.insert(1, "one");
|
|||
|
|
map.insert(2, "two");
|
|||
|
|
|
|||
|
|
map = FnvHashMap::with_capacity_and_hasher(10, Default::default());
|
|||
|
|
map.insert(1, "one");
|
|||
|
|
map.insert(2, "two");
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
Note, the standard library’s `HashMap::new` and `HashMap::with_capacity`
|
|||
|
|
are only implemented for the `RandomState` hasher, so using `Default` to
|
|||
|
|
get the hasher is the next best option.
|
|||
|
|
|
|||
|
|
## Using FNV in a `HashSet`
|
|||
|
|
|
|||
|
|
Similarly, `FnvHashSet` is a type alias for the standard library’s `HashSet`
|
|||
|
|
with FNV.
|
|||
|
|
|
|||
|
|
```rust
|
|||
|
|
use fnv::FnvHashSet;
|
|||
|
|
|
|||
|
|
let mut set = FnvHashSet::default();
|
|||
|
|
set.insert(1);
|
|||
|
|
set.insert(2);
|
|||
|
|
|
|||
|
|
set = FnvHashSet::with_capacity_and_hasher(10, Default::default());
|
|||
|
|
set.insert(1);
|
|||
|
|
set.insert(2);
|
|||
|
|
```
|
|||
|
|
Á ø ú üüB ? [chongo]: http://www.isthe.com/chongo/tech/comp/fnv/index.htmlÁ ü¿O L [faq]: https://www.rust-lang.org/en-US/faq.html#why-are-rusts-hashmaps-slowÁ ü�6 3 [graphs]: https://cglab.ca/~abeinges/blah/hash-rs/Á
|
|||
|
|
À$
|
|||
|
|
q%
|
|||
|
|
³ q6
|
|||
|
|
µ ‘%
|
|||
|
|
¢e •$
|
|||
|
|
Êe �#
|
|||
|
|
ð �"
|
|||
|
|
¡
|
|||
|
|
�
|
|||
|
|
¬Ì ™
|
|||
|
|
Lÿ |
|
|||
|
|
|
|||
|
|
o
|
|||
|
|
r
|
|||
|
|
„Ä f
|
|||
|
|
i
|
|||
|
|
Y
|
|||
|
|
\
|
|||
|
|
?
|
|||
|
|
üï> ; An implementation of the Fowler–Noll–Vo hash function.Á ® ú ü²? < See the [crate documentation](index.html) for more details.Á L¤ « G2¨cïý—ô � « ?
|
|||
|
|
2 � «
|
|||
|
|
|
|||
|
|
|