| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/num-bigint-0.3.3/src/biguint/convert.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>convert.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../num_bigint/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../num_bigint/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| <span id="522">522</span> |
| <span id="523">523</span> |
| <span id="524">524</span> |
| <span id="525">525</span> |
| <span id="526">526</span> |
| <span id="527">527</span> |
| <span id="528">528</span> |
| <span id="529">529</span> |
| <span id="530">530</span> |
| <span id="531">531</span> |
| <span id="532">532</span> |
| <span id="533">533</span> |
| <span id="534">534</span> |
| <span id="535">535</span> |
| <span id="536">536</span> |
| <span id="537">537</span> |
| <span id="538">538</span> |
| <span id="539">539</span> |
| <span id="540">540</span> |
| <span id="541">541</span> |
| <span id="542">542</span> |
| <span id="543">543</span> |
| <span id="544">544</span> |
| <span id="545">545</span> |
| <span id="546">546</span> |
| <span id="547">547</span> |
| <span id="548">548</span> |
| <span id="549">549</span> |
| <span id="550">550</span> |
| <span id="551">551</span> |
| <span id="552">552</span> |
| <span id="553">553</span> |
| <span id="554">554</span> |
| <span id="555">555</span> |
| <span id="556">556</span> |
| <span id="557">557</span> |
| <span id="558">558</span> |
| <span id="559">559</span> |
| <span id="560">560</span> |
| <span id="561">561</span> |
| <span id="562">562</span> |
| <span id="563">563</span> |
| <span id="564">564</span> |
| <span id="565">565</span> |
| <span id="566">566</span> |
| <span id="567">567</span> |
| <span id="568">568</span> |
| <span id="569">569</span> |
| <span id="570">570</span> |
| <span id="571">571</span> |
| <span id="572">572</span> |
| <span id="573">573</span> |
| <span id="574">574</span> |
| <span id="575">575</span> |
| <span id="576">576</span> |
| <span id="577">577</span> |
| <span id="578">578</span> |
| <span id="579">579</span> |
| <span id="580">580</span> |
| <span id="581">581</span> |
| <span id="582">582</span> |
| <span id="583">583</span> |
| <span id="584">584</span> |
| <span id="585">585</span> |
| <span id="586">586</span> |
| <span id="587">587</span> |
| <span id="588">588</span> |
| <span id="589">589</span> |
| <span id="590">590</span> |
| <span id="591">591</span> |
| <span id="592">592</span> |
| <span id="593">593</span> |
| <span id="594">594</span> |
| <span id="595">595</span> |
| <span id="596">596</span> |
| <span id="597">597</span> |
| <span id="598">598</span> |
| <span id="599">599</span> |
| <span id="600">600</span> |
| <span id="601">601</span> |
| <span id="602">602</span> |
| <span id="603">603</span> |
| <span id="604">604</span> |
| <span id="605">605</span> |
| <span id="606">606</span> |
| <span id="607">607</span> |
| <span id="608">608</span> |
| <span id="609">609</span> |
| <span id="610">610</span> |
| <span id="611">611</span> |
| <span id="612">612</span> |
| <span id="613">613</span> |
| <span id="614">614</span> |
| <span id="615">615</span> |
| <span id="616">616</span> |
| <span id="617">617</span> |
| <span id="618">618</span> |
| <span id="619">619</span> |
| <span id="620">620</span> |
| <span id="621">621</span> |
| <span id="622">622</span> |
| <span id="623">623</span> |
| <span id="624">624</span> |
| <span id="625">625</span> |
| <span id="626">626</span> |
| <span id="627">627</span> |
| <span id="628">628</span> |
| <span id="629">629</span> |
| <span id="630">630</span> |
| <span id="631">631</span> |
| <span id="632">632</span> |
| <span id="633">633</span> |
| <span id="634">634</span> |
| <span id="635">635</span> |
| <span id="636">636</span> |
| <span id="637">637</span> |
| <span id="638">638</span> |
| <span id="639">639</span> |
| <span id="640">640</span> |
| <span id="641">641</span> |
| <span id="642">642</span> |
| <span id="643">643</span> |
| <span id="644">644</span> |
| <span id="645">645</span> |
| <span id="646">646</span> |
| <span id="647">647</span> |
| <span id="648">648</span> |
| <span id="649">649</span> |
| <span id="650">650</span> |
| <span id="651">651</span> |
| <span id="652">652</span> |
| <span id="653">653</span> |
| <span id="654">654</span> |
| <span id="655">655</span> |
| <span id="656">656</span> |
| <span id="657">657</span> |
| <span id="658">658</span> |
| <span id="659">659</span> |
| <span id="660">660</span> |
| <span id="661">661</span> |
| <span id="662">662</span> |
| <span id="663">663</span> |
| <span id="664">664</span> |
| <span id="665">665</span> |
| <span id="666">666</span> |
| <span id="667">667</span> |
| <span id="668">668</span> |
| <span id="669">669</span> |
| <span id="670">670</span> |
| <span id="671">671</span> |
| <span id="672">672</span> |
| <span id="673">673</span> |
| <span id="674">674</span> |
| <span id="675">675</span> |
| <span id="676">676</span> |
| <span id="677">677</span> |
| <span id="678">678</span> |
| <span id="679">679</span> |
| <span id="680">680</span> |
| <span id="681">681</span> |
| <span id="682">682</span> |
| <span id="683">683</span> |
| <span id="684">684</span> |
| <span id="685">685</span> |
| <span id="686">686</span> |
| <span id="687">687</span> |
| <span id="688">688</span> |
| <span id="689">689</span> |
| <span id="690">690</span> |
| <span id="691">691</span> |
| <span id="692">692</span> |
| <span id="693">693</span> |
| <span id="694">694</span> |
| <span id="695">695</span> |
| <span id="696">696</span> |
| <span id="697">697</span> |
| <span id="698">698</span> |
| <span id="699">699</span> |
| <span id="700">700</span> |
| <span id="701">701</span> |
| <span id="702">702</span> |
| <span id="703">703</span> |
| <span id="704">704</span> |
| <span id="705">705</span> |
| <span id="706">706</span> |
| <span id="707">707</span> |
| <span id="708">708</span> |
| <span id="709">709</span> |
| <span id="710">710</span> |
| <span id="711">711</span> |
| <span id="712">712</span> |
| <span id="713">713</span> |
| <span id="714">714</span> |
| <span id="715">715</span> |
| <span id="716">716</span> |
| <span id="717">717</span> |
| <span id="718">718</span> |
| <span id="719">719</span> |
| <span id="720">720</span> |
| <span id="721">721</span> |
| <span id="722">722</span> |
| <span id="723">723</span> |
| <span id="724">724</span> |
| <span id="725">725</span> |
| <span id="726">726</span> |
| <span id="727">727</span> |
| <span id="728">728</span> |
| <span id="729">729</span> |
| <span id="730">730</span> |
| <span id="731">731</span> |
| <span id="732">732</span> |
| <span id="733">733</span> |
| <span id="734">734</span> |
| <span id="735">735</span> |
| <span id="736">736</span> |
| <span id="737">737</span> |
| <span id="738">738</span> |
| <span id="739">739</span> |
| <span id="740">740</span> |
| <span id="741">741</span> |
| <span id="742">742</span> |
| <span id="743">743</span> |
| <span id="744">744</span> |
| <span id="745">745</span> |
| <span id="746">746</span> |
| <span id="747">747</span> |
| <span id="748">748</span> |
| <span id="749">749</span> |
| <span id="750">750</span> |
| <span id="751">751</span> |
| </pre><pre class="rust"><code><span class="kw">use super</span>::{biguint_from_vec, BigUint, ToBigUint}; |
| |
| <span class="kw">use </span><span class="kw">super</span>::addition::add2; |
| <span class="kw">use </span><span class="kw">super</span>::division::div_rem_digit; |
| <span class="kw">use </span><span class="kw">super</span>::multiplication::mac_with_carry; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::big_digit::{<span class="self">self</span>, BigDigit}; |
| <span class="kw">use </span><span class="kw">crate</span>::std_alloc::Vec; |
| <span class="kw">use </span><span class="kw">crate</span>::ParseBigIntError; |
| <span class="attribute">#[cfg(has_try_from)] |
| </span><span class="kw">use </span><span class="kw">crate</span>::TryFromBigIntError; |
| |
| <span class="kw">use </span>core::cmp::Ordering::{Equal, Greater, Less}; |
| <span class="attribute">#[cfg(has_try_from)] |
| </span><span class="kw">use </span>core::convert::TryFrom; |
| <span class="kw">use </span>core::mem; |
| <span class="kw">use </span>core::str::FromStr; |
| <span class="kw">use </span>num_integer::Integer; |
| <span class="kw">use </span>num_traits::float::FloatCore; |
| <span class="kw">use </span>num_traits::{FromPrimitive, Num, PrimInt, ToPrimitive, Zero}; |
| |
| <span class="doccomment">/// Find last set bit |
| /// fls(0) == 0, fls(u32::MAX) == 32 |
| </span><span class="kw">fn </span>fls<T: PrimInt>(v: T) -> u8 { |
| mem::size_of::<T>() <span class="kw">as </span>u8 * <span class="number">8 </span>- v.leading_zeros() <span class="kw">as </span>u8 |
| } |
| |
| <span class="kw">fn </span>ilog2<T: PrimInt>(v: T) -> u8 { |
| fls(v) - <span class="number">1 |
| </span>} |
| |
| <span class="kw">impl </span>FromStr <span class="kw">for </span>BigUint { |
| <span class="kw">type </span><span class="prelude-val">Err </span>= ParseBigIntError; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>from_str(s: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><BigUint, ParseBigIntError> { |
| BigUint::from_str_radix(s, <span class="number">10</span>) |
| } |
| } |
| |
| <span class="comment">// Convert from a power of two radix (bits == ilog2(radix)) where bits evenly divides |
| // BigDigit::BITS |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>from_bitwise_digits_le(v: <span class="kw-2">&</span>[u8], bits: u8) -> BigUint { |
| <span class="macro">debug_assert!</span>(!v.is_empty() && bits <= <span class="number">8 </span>&& big_digit::BITS % bits == <span class="number">0</span>); |
| <span class="macro">debug_assert!</span>(v.iter().all(|<span class="kw-2">&</span>c| BigDigit::from(c) < (<span class="number">1 </span><< bits))); |
| |
| <span class="kw">let </span>digits_per_big_digit = big_digit::BITS / bits; |
| |
| <span class="kw">let </span>data = v |
| .chunks(digits_per_big_digit.into()) |
| .map(|chunk| { |
| chunk |
| .iter() |
| .rev() |
| .fold(<span class="number">0</span>, |acc, <span class="kw-2">&</span>c| (acc << bits) | BigDigit::from(c)) |
| }) |
| .collect(); |
| |
| biguint_from_vec(data) |
| } |
| |
| <span class="comment">// Convert from a power of two radix (bits == ilog2(radix)) where bits doesn't evenly divide |
| // BigDigit::BITS |
| </span><span class="kw">fn </span>from_inexact_bitwise_digits_le(v: <span class="kw-2">&</span>[u8], bits: u8) -> BigUint { |
| <span class="macro">debug_assert!</span>(!v.is_empty() && bits <= <span class="number">8 </span>&& big_digit::BITS % bits != <span class="number">0</span>); |
| <span class="macro">debug_assert!</span>(v.iter().all(|<span class="kw-2">&</span>c| BigDigit::from(c) < (<span class="number">1 </span><< bits))); |
| |
| <span class="kw">let </span>total_bits = (v.len() <span class="kw">as </span>u64).saturating_mul(bits.into()); |
| <span class="kw">let </span>big_digits = Integer::div_ceil(<span class="kw-2">&</span>total_bits, <span class="kw-2">&</span>big_digit::BITS.into()) |
| .to_usize() |
| .unwrap_or(core::usize::MAX); |
| <span class="kw">let </span><span class="kw-2">mut </span>data = Vec::with_capacity(big_digits); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>d = <span class="number">0</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>dbits = <span class="number">0</span>; <span class="comment">// number of bits we currently have in d |
| |
| // walk v accumululating bits in d; whenever we accumulate big_digit::BITS in d, spit out a |
| // big_digit: |
| </span><span class="kw">for </span><span class="kw-2">&</span>c <span class="kw">in </span>v { |
| d |= BigDigit::from(c) << dbits; |
| dbits += bits; |
| |
| <span class="kw">if </span>dbits >= big_digit::BITS { |
| data.push(d); |
| dbits -= big_digit::BITS; |
| <span class="comment">// if dbits was > big_digit::BITS, we dropped some of the bits in c (they couldn't fit |
| // in d) - grab the bits we lost here: |
| </span>d = BigDigit::from(c) >> (bits - dbits); |
| } |
| } |
| |
| <span class="kw">if </span>dbits > <span class="number">0 </span>{ |
| <span class="macro">debug_assert!</span>(dbits < big_digit::BITS); |
| data.push(d <span class="kw">as </span>BigDigit); |
| } |
| |
| biguint_from_vec(data) |
| } |
| |
| <span class="comment">// Read little-endian radix digits |
| </span><span class="kw">fn </span>from_radix_digits_be(v: <span class="kw-2">&</span>[u8], radix: u32) -> BigUint { |
| <span class="macro">debug_assert!</span>(!v.is_empty() && !radix.is_power_of_two()); |
| <span class="macro">debug_assert!</span>(v.iter().all(|<span class="kw-2">&</span>c| u32::from(c) < radix)); |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">let </span>radix_log2 = f64::from(radix).log2(); |
| <span class="attribute">#[cfg(not(feature = <span class="string">"std"</span>))] |
| </span><span class="kw">let </span>radix_log2 = ilog2(radix.next_power_of_two()) <span class="kw">as </span>f64; |
| |
| <span class="comment">// Estimate how big the result will be, so we can pre-allocate it. |
| </span><span class="kw">let </span>bits = radix_log2 * v.len() <span class="kw">as </span>f64; |
| <span class="kw">let </span>big_digits = (bits / big_digit::BITS <span class="kw">as </span>f64).ceil(); |
| <span class="kw">let </span><span class="kw-2">mut </span>data = Vec::with_capacity(big_digits.to_usize().unwrap_or(<span class="number">0</span>)); |
| |
| <span class="kw">let </span>(base, power) = get_radix_base(radix, big_digit::BITS); |
| <span class="kw">let </span>radix = radix <span class="kw">as </span>BigDigit; |
| |
| <span class="kw">let </span>r = v.len() % power; |
| <span class="kw">let </span>i = <span class="kw">if </span>r == <span class="number">0 </span>{ power } <span class="kw">else </span>{ r }; |
| <span class="kw">let </span>(head, tail) = v.split_at(i); |
| |
| <span class="kw">let </span>first = head |
| .iter() |
| .fold(<span class="number">0</span>, |acc, <span class="kw-2">&</span>d| acc * radix + BigDigit::from(d)); |
| data.push(first); |
| |
| <span class="macro">debug_assert!</span>(tail.len() % power == <span class="number">0</span>); |
| <span class="kw">for </span>chunk <span class="kw">in </span>tail.chunks(power) { |
| <span class="kw">if </span>data.last() != <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">0</span>) { |
| data.push(<span class="number">0</span>); |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>carry = <span class="number">0</span>; |
| <span class="kw">for </span>d <span class="kw">in </span>data.iter_mut() { |
| <span class="kw-2">*</span>d = mac_with_carry(<span class="number">0</span>, <span class="kw-2">*</span>d, base, <span class="kw-2">&mut </span>carry); |
| } |
| <span class="macro">debug_assert!</span>(carry == <span class="number">0</span>); |
| |
| <span class="kw">let </span>n = chunk |
| .iter() |
| .fold(<span class="number">0</span>, |acc, <span class="kw-2">&</span>d| acc * radix + BigDigit::from(d)); |
| add2(<span class="kw-2">&mut </span>data, <span class="kw-2">&</span>[n]); |
| } |
| |
| biguint_from_vec(data) |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>from_radix_be(buf: <span class="kw-2">&</span>[u8], radix: u32) -> <span class="prelude-ty">Option</span><BigUint> { |
| <span class="macro">assert!</span>( |
| <span class="number">2 </span><= radix && radix <= <span class="number">256</span>, |
| <span class="string">"The radix must be within 2...256" |
| </span>); |
| |
| <span class="kw">if </span>buf.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">Some</span>(Zero::zero()); |
| } |
| |
| <span class="kw">if </span>radix != <span class="number">256 </span>&& buf.iter().any(|<span class="kw-2">&</span>b| b >= radix <span class="kw">as </span>u8) { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| |
| <span class="kw">let </span>res = <span class="kw">if </span>radix.is_power_of_two() { |
| <span class="comment">// Powers of two can use bitwise masks and shifting instead of multiplication |
| </span><span class="kw">let </span>bits = ilog2(radix); |
| <span class="kw">let </span><span class="kw-2">mut </span>v = Vec::from(buf); |
| v.reverse(); |
| <span class="kw">if </span>big_digit::BITS % bits == <span class="number">0 </span>{ |
| from_bitwise_digits_le(<span class="kw-2">&</span>v, bits) |
| } <span class="kw">else </span>{ |
| from_inexact_bitwise_digits_le(<span class="kw-2">&</span>v, bits) |
| } |
| } <span class="kw">else </span>{ |
| from_radix_digits_be(buf, radix) |
| }; |
| |
| <span class="prelude-val">Some</span>(res) |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>from_radix_le(buf: <span class="kw-2">&</span>[u8], radix: u32) -> <span class="prelude-ty">Option</span><BigUint> { |
| <span class="macro">assert!</span>( |
| <span class="number">2 </span><= radix && radix <= <span class="number">256</span>, |
| <span class="string">"The radix must be within 2...256" |
| </span>); |
| |
| <span class="kw">if </span>buf.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">Some</span>(Zero::zero()); |
| } |
| |
| <span class="kw">if </span>radix != <span class="number">256 </span>&& buf.iter().any(|<span class="kw-2">&</span>b| b >= radix <span class="kw">as </span>u8) { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| |
| <span class="kw">let </span>res = <span class="kw">if </span>radix.is_power_of_two() { |
| <span class="comment">// Powers of two can use bitwise masks and shifting instead of multiplication |
| </span><span class="kw">let </span>bits = ilog2(radix); |
| <span class="kw">if </span>big_digit::BITS % bits == <span class="number">0 </span>{ |
| from_bitwise_digits_le(buf, bits) |
| } <span class="kw">else </span>{ |
| from_inexact_bitwise_digits_le(buf, bits) |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>v = Vec::from(buf); |
| v.reverse(); |
| from_radix_digits_be(<span class="kw-2">&</span>v, radix) |
| }; |
| |
| <span class="prelude-val">Some</span>(res) |
| } |
| |
| <span class="kw">impl </span>Num <span class="kw">for </span>BigUint { |
| <span class="kw">type </span>FromStrRadixErr = ParseBigIntError; |
| |
| <span class="doccomment">/// Creates and initializes a `BigUint`. |
| </span><span class="kw">fn </span>from_str_radix(s: <span class="kw-2">&</span>str, radix: u32) -> <span class="prelude-ty">Result</span><BigUint, ParseBigIntError> { |
| <span class="macro">assert!</span>(<span class="number">2 </span><= radix && radix <= <span class="number">36</span>, <span class="string">"The radix must be within 2...36"</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>s = s; |
| <span class="kw">if </span>s.starts_with(<span class="string">'+'</span>) { |
| <span class="kw">let </span>tail = <span class="kw-2">&</span>s[<span class="number">1</span>..]; |
| <span class="kw">if </span>!tail.starts_with(<span class="string">'+'</span>) { |
| s = tail |
| } |
| } |
| |
| <span class="kw">if </span>s.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(ParseBigIntError::empty()); |
| } |
| |
| <span class="kw">if </span>s.starts_with(<span class="string">'_'</span>) { |
| <span class="comment">// Must lead with a real digit! |
| </span><span class="kw">return </span><span class="prelude-val">Err</span>(ParseBigIntError::invalid()); |
| } |
| |
| <span class="comment">// First normalize all characters to plain digit values |
| </span><span class="kw">let </span><span class="kw-2">mut </span>v = Vec::with_capacity(s.len()); |
| <span class="kw">for </span>b <span class="kw">in </span>s.bytes() { |
| <span class="kw">let </span>d = <span class="kw">match </span>b { |
| <span class="string">b'0'</span>..=<span class="string">b'9' </span>=> b - <span class="string">b'0'</span>, |
| <span class="string">b'a'</span>..=<span class="string">b'z' </span>=> b - <span class="string">b'a' </span>+ <span class="number">10</span>, |
| <span class="string">b'A'</span>..=<span class="string">b'Z' </span>=> b - <span class="string">b'A' </span>+ <span class="number">10</span>, |
| <span class="string">b'_' </span>=> <span class="kw">continue</span>, |
| <span class="kw">_ </span>=> core::u8::MAX, |
| }; |
| <span class="kw">if </span>d < radix <span class="kw">as </span>u8 { |
| v.push(d); |
| } <span class="kw">else </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(ParseBigIntError::invalid()); |
| } |
| } |
| |
| <span class="kw">let </span>res = <span class="kw">if </span>radix.is_power_of_two() { |
| <span class="comment">// Powers of two can use bitwise masks and shifting instead of multiplication |
| </span><span class="kw">let </span>bits = ilog2(radix); |
| v.reverse(); |
| <span class="kw">if </span>big_digit::BITS % bits == <span class="number">0 </span>{ |
| from_bitwise_digits_le(<span class="kw-2">&</span>v, bits) |
| } <span class="kw">else </span>{ |
| from_inexact_bitwise_digits_le(<span class="kw-2">&</span>v, bits) |
| } |
| } <span class="kw">else </span>{ |
| from_radix_digits_be(<span class="kw-2">&</span>v, radix) |
| }; |
| <span class="prelude-val">Ok</span>(res) |
| } |
| } |
| |
| <span class="kw">fn </span>high_bits_to_u64(v: <span class="kw-2">&</span>BigUint) -> u64 { |
| <span class="kw">match </span>v.data.len() { |
| <span class="number">0 </span>=> <span class="number">0</span>, |
| <span class="number">1 </span>=> { |
| <span class="comment">// XXX Conversion is useless if already 64-bit. |
| </span><span class="attribute">#[allow(clippy::useless_conversion)] |
| </span><span class="kw">let </span>v0 = u64::from(v.data[<span class="number">0</span>]); |
| v0 |
| } |
| <span class="kw">_ </span>=> { |
| <span class="kw">let </span><span class="kw-2">mut </span>bits = v.bits(); |
| <span class="kw">let </span><span class="kw-2">mut </span>ret = <span class="number">0u64</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>ret_bits = <span class="number">0</span>; |
| |
| <span class="kw">for </span>d <span class="kw">in </span>v.data.iter().rev() { |
| <span class="kw">let </span>digit_bits = (bits - <span class="number">1</span>) % u64::from(big_digit::BITS) + <span class="number">1</span>; |
| <span class="kw">let </span>bits_want = Ord::min(<span class="number">64 </span>- ret_bits, digit_bits); |
| |
| <span class="kw">if </span>bits_want != <span class="number">64 </span>{ |
| ret <<= bits_want; |
| } |
| <span class="comment">// XXX Conversion is useless if already 64-bit. |
| </span><span class="attribute">#[allow(clippy::useless_conversion)] |
| </span><span class="kw">let </span>d0 = u64::from(<span class="kw-2">*</span>d) >> (digit_bits - bits_want); |
| ret |= d0; |
| ret_bits += bits_want; |
| bits -= bits_want; |
| |
| <span class="kw">if </span>ret_bits == <span class="number">64 </span>{ |
| <span class="kw">break</span>; |
| } |
| } |
| |
| ret |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>ToPrimitive <span class="kw">for </span>BigUint { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>to_i64(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><i64> { |
| <span class="self">self</span>.to_u64().as_ref().and_then(u64::to_i64) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>to_i128(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><i128> { |
| <span class="self">self</span>.to_u128().as_ref().and_then(u128::to_i128) |
| } |
| |
| <span class="attribute">#[allow(clippy::useless_conversion)] |
| #[inline] |
| </span><span class="kw">fn </span>to_u64(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><u64> { |
| <span class="kw">let </span><span class="kw-2">mut </span>ret: u64 = <span class="number">0</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>bits = <span class="number">0</span>; |
| |
| <span class="kw">for </span>i <span class="kw">in </span><span class="self">self</span>.data.iter() { |
| <span class="kw">if </span>bits >= <span class="number">64 </span>{ |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| |
| <span class="comment">// XXX Conversion is useless if already 64-bit. |
| </span>ret += u64::from(<span class="kw-2">*</span>i) << bits; |
| bits += big_digit::BITS; |
| } |
| |
| <span class="prelude-val">Some</span>(ret) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>to_u128(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><u128> { |
| <span class="kw">let </span><span class="kw-2">mut </span>ret: u128 = <span class="number">0</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>bits = <span class="number">0</span>; |
| |
| <span class="kw">for </span>i <span class="kw">in </span><span class="self">self</span>.data.iter() { |
| <span class="kw">if </span>bits >= <span class="number">128 </span>{ |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| |
| ret |= u128::from(<span class="kw-2">*</span>i) << bits; |
| bits += big_digit::BITS; |
| } |
| |
| <span class="prelude-val">Some</span>(ret) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>to_f32(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><f32> { |
| <span class="kw">let </span>mantissa = high_bits_to_u64(<span class="self">self</span>); |
| <span class="kw">let </span>exponent = <span class="self">self</span>.bits() - u64::from(fls(mantissa)); |
| |
| <span class="kw">if </span>exponent > core::f32::MAX_EXP <span class="kw">as </span>u64 { |
| <span class="prelude-val">Some</span>(core::f32::INFINITY) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Some</span>((mantissa <span class="kw">as </span>f32) * <span class="number">2.0f32</span>.powi(exponent <span class="kw">as </span>i32)) |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>to_f64(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><f64> { |
| <span class="kw">let </span>mantissa = high_bits_to_u64(<span class="self">self</span>); |
| <span class="kw">let </span>exponent = <span class="self">self</span>.bits() - u64::from(fls(mantissa)); |
| |
| <span class="kw">if </span>exponent > core::f64::MAX_EXP <span class="kw">as </span>u64 { |
| <span class="prelude-val">Some</span>(core::f64::INFINITY) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Some</span>((mantissa <span class="kw">as </span>f64) * <span class="number">2.0f64</span>.powi(exponent <span class="kw">as </span>i32)) |
| } |
| } |
| } |
| |
| <span class="macro">macro_rules! </span>impl_try_from_biguint { |
| (<span class="macro-nonterminal">$T</span>:ty, <span class="macro-nonterminal">$to_ty</span>:path) => { |
| <span class="attribute">#[cfg(has_try_from)] |
| </span><span class="kw">impl </span>TryFrom<<span class="kw-2">&</span>BigUint> <span class="kw">for </span><span class="macro-nonterminal">$T </span>{ |
| <span class="kw">type </span>Error = TryFromBigIntError<()>; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>try_from(value: <span class="kw-2">&</span>BigUint) -> <span class="prelude-ty">Result</span><<span class="macro-nonterminal">$T</span>, TryFromBigIntError<()>> { |
| <span class="macro-nonterminal">$to_ty</span>(value).ok_or(TryFromBigIntError::new(())) |
| } |
| } |
| |
| <span class="attribute">#[cfg(has_try_from)] |
| </span><span class="kw">impl </span>TryFrom<BigUint> <span class="kw">for </span><span class="macro-nonterminal">$T </span>{ |
| <span class="kw">type </span>Error = TryFromBigIntError<BigUint>; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>try_from(value: BigUint) -> <span class="prelude-ty">Result</span><<span class="macro-nonterminal">$T</span>, TryFromBigIntError<BigUint>> { |
| <<span class="macro-nonterminal">$T</span>>::try_from(<span class="kw-2">&</span>value).map_err(|<span class="kw">_</span>| TryFromBigIntError::new(value)) |
| } |
| } |
| }; |
| } |
| |
| <span class="macro">impl_try_from_biguint!</span>(u8, ToPrimitive::to_u8); |
| <span class="macro">impl_try_from_biguint!</span>(u16, ToPrimitive::to_u16); |
| <span class="macro">impl_try_from_biguint!</span>(u32, ToPrimitive::to_u32); |
| <span class="macro">impl_try_from_biguint!</span>(u64, ToPrimitive::to_u64); |
| <span class="macro">impl_try_from_biguint!</span>(usize, ToPrimitive::to_usize); |
| <span class="macro">impl_try_from_biguint!</span>(u128, ToPrimitive::to_u128); |
| |
| <span class="macro">impl_try_from_biguint!</span>(i8, ToPrimitive::to_i8); |
| <span class="macro">impl_try_from_biguint!</span>(i16, ToPrimitive::to_i16); |
| <span class="macro">impl_try_from_biguint!</span>(i32, ToPrimitive::to_i32); |
| <span class="macro">impl_try_from_biguint!</span>(i64, ToPrimitive::to_i64); |
| <span class="macro">impl_try_from_biguint!</span>(isize, ToPrimitive::to_isize); |
| <span class="macro">impl_try_from_biguint!</span>(i128, ToPrimitive::to_i128); |
| |
| <span class="kw">impl </span>FromPrimitive <span class="kw">for </span>BigUint { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>from_i64(n: i64) -> <span class="prelude-ty">Option</span><BigUint> { |
| <span class="kw">if </span>n >= <span class="number">0 </span>{ |
| <span class="prelude-val">Some</span>(BigUint::from(n <span class="kw">as </span>u64)) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>from_i128(n: i128) -> <span class="prelude-ty">Option</span><BigUint> { |
| <span class="kw">if </span>n >= <span class="number">0 </span>{ |
| <span class="prelude-val">Some</span>(BigUint::from(n <span class="kw">as </span>u128)) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>from_u64(n: u64) -> <span class="prelude-ty">Option</span><BigUint> { |
| <span class="prelude-val">Some</span>(BigUint::from(n)) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>from_u128(n: u128) -> <span class="prelude-ty">Option</span><BigUint> { |
| <span class="prelude-val">Some</span>(BigUint::from(n)) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>from_f64(<span class="kw-2">mut </span>n: f64) -> <span class="prelude-ty">Option</span><BigUint> { |
| <span class="comment">// handle NAN, INFINITY, NEG_INFINITY |
| </span><span class="kw">if </span>!n.is_finite() { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| |
| <span class="comment">// match the rounding of casting from float to int |
| </span>n = n.trunc(); |
| |
| <span class="comment">// handle 0.x, -0.x |
| </span><span class="kw">if </span>n.is_zero() { |
| <span class="kw">return </span><span class="prelude-val">Some</span>(BigUint::zero()); |
| } |
| |
| <span class="kw">let </span>(mantissa, exponent, sign) = FloatCore::integer_decode(n); |
| |
| <span class="kw">if </span>sign == -<span class="number">1 </span>{ |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>ret = BigUint::from(mantissa); |
| <span class="kw">match </span>exponent.cmp(<span class="kw-2">&</span><span class="number">0</span>) { |
| Greater => ret <<= exponent <span class="kw">as </span>usize, |
| Equal => {} |
| Less => ret >>= (-exponent) <span class="kw">as </span>usize, |
| } |
| <span class="prelude-val">Some</span>(ret) |
| } |
| } |
| |
| <span class="kw">impl </span>From<u64> <span class="kw">for </span>BigUint { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>from(<span class="kw-2">mut </span>n: u64) -> <span class="self">Self </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>ret: BigUint = Zero::zero(); |
| |
| <span class="kw">while </span>n != <span class="number">0 </span>{ |
| ret.data.push(n <span class="kw">as </span>BigDigit); |
| <span class="comment">// don't overflow if BITS is 64: |
| </span>n = (n >> <span class="number">1</span>) >> (big_digit::BITS - <span class="number">1</span>); |
| } |
| |
| ret |
| } |
| } |
| |
| <span class="kw">impl </span>From<u128> <span class="kw">for </span>BigUint { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>from(<span class="kw-2">mut </span>n: u128) -> <span class="self">Self </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>ret: BigUint = Zero::zero(); |
| |
| <span class="kw">while </span>n != <span class="number">0 </span>{ |
| ret.data.push(n <span class="kw">as </span>BigDigit); |
| n >>= big_digit::BITS; |
| } |
| |
| ret |
| } |
| } |
| |
| <span class="macro">macro_rules! </span>impl_biguint_from_uint { |
| (<span class="macro-nonterminal">$T</span>:ty) => { |
| <span class="kw">impl </span>From<<span class="macro-nonterminal">$T</span>> <span class="kw">for </span>BigUint { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>from(n: <span class="macro-nonterminal">$T</span>) -> <span class="self">Self </span>{ |
| BigUint::from(n <span class="kw">as </span>u64) |
| } |
| } |
| }; |
| } |
| |
| <span class="macro">impl_biguint_from_uint!</span>(u8); |
| <span class="macro">impl_biguint_from_uint!</span>(u16); |
| <span class="macro">impl_biguint_from_uint!</span>(u32); |
| <span class="macro">impl_biguint_from_uint!</span>(usize); |
| |
| <span class="macro">macro_rules! </span>impl_biguint_try_from_int { |
| (<span class="macro-nonterminal">$T</span>:ty, <span class="macro-nonterminal">$from_ty</span>:path) => { |
| <span class="attribute">#[cfg(has_try_from)] |
| </span><span class="kw">impl </span>TryFrom<<span class="macro-nonterminal">$T</span>> <span class="kw">for </span>BigUint { |
| <span class="kw">type </span>Error = TryFromBigIntError<()>; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>try_from(value: <span class="macro-nonterminal">$T</span>) -> <span class="prelude-ty">Result</span><BigUint, TryFromBigIntError<()>> { |
| <span class="macro-nonterminal">$from_ty</span>(value).ok_or(TryFromBigIntError::new(())) |
| } |
| } |
| }; |
| } |
| |
| <span class="macro">impl_biguint_try_from_int!</span>(i8, FromPrimitive::from_i8); |
| <span class="macro">impl_biguint_try_from_int!</span>(i16, FromPrimitive::from_i16); |
| <span class="macro">impl_biguint_try_from_int!</span>(i32, FromPrimitive::from_i32); |
| <span class="macro">impl_biguint_try_from_int!</span>(i64, FromPrimitive::from_i64); |
| <span class="macro">impl_biguint_try_from_int!</span>(isize, FromPrimitive::from_isize); |
| <span class="macro">impl_biguint_try_from_int!</span>(i128, FromPrimitive::from_i128); |
| |
| <span class="kw">impl </span>ToBigUint <span class="kw">for </span>BigUint { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>to_biguint(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><BigUint> { |
| <span class="prelude-val">Some</span>(<span class="self">self</span>.clone()) |
| } |
| } |
| |
| <span class="macro">macro_rules! </span>impl_to_biguint { |
| (<span class="macro-nonterminal">$T</span>:ty, <span class="macro-nonterminal">$from_ty</span>:path) => { |
| <span class="kw">impl </span>ToBigUint <span class="kw">for </span><span class="macro-nonterminal">$T </span>{ |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>to_biguint(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><BigUint> { |
| <span class="macro-nonterminal">$from_ty</span>(<span class="kw-2">*</span><span class="self">self</span>) |
| } |
| } |
| }; |
| } |
| |
| <span class="macro">impl_to_biguint!</span>(isize, FromPrimitive::from_isize); |
| <span class="macro">impl_to_biguint!</span>(i8, FromPrimitive::from_i8); |
| <span class="macro">impl_to_biguint!</span>(i16, FromPrimitive::from_i16); |
| <span class="macro">impl_to_biguint!</span>(i32, FromPrimitive::from_i32); |
| <span class="macro">impl_to_biguint!</span>(i64, FromPrimitive::from_i64); |
| <span class="macro">impl_to_biguint!</span>(i128, FromPrimitive::from_i128); |
| |
| <span class="macro">impl_to_biguint!</span>(usize, FromPrimitive::from_usize); |
| <span class="macro">impl_to_biguint!</span>(u8, FromPrimitive::from_u8); |
| <span class="macro">impl_to_biguint!</span>(u16, FromPrimitive::from_u16); |
| <span class="macro">impl_to_biguint!</span>(u32, FromPrimitive::from_u32); |
| <span class="macro">impl_to_biguint!</span>(u64, FromPrimitive::from_u64); |
| <span class="macro">impl_to_biguint!</span>(u128, FromPrimitive::from_u128); |
| |
| <span class="macro">impl_to_biguint!</span>(f32, FromPrimitive::from_f32); |
| <span class="macro">impl_to_biguint!</span>(f64, FromPrimitive::from_f64); |
| |
| <span class="comment">// Extract bitwise digits that evenly divide BigDigit |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>to_bitwise_digits_le(u: <span class="kw-2">&</span>BigUint, bits: u8) -> Vec<u8> { |
| <span class="macro">debug_assert!</span>(!u.is_zero() && bits <= <span class="number">8 </span>&& big_digit::BITS % bits == <span class="number">0</span>); |
| |
| <span class="kw">let </span>last_i = u.data.len() - <span class="number">1</span>; |
| <span class="kw">let </span>mask: BigDigit = (<span class="number">1 </span><< bits) - <span class="number">1</span>; |
| <span class="kw">let </span>digits_per_big_digit = big_digit::BITS / bits; |
| <span class="kw">let </span>digits = Integer::div_ceil(<span class="kw-2">&</span>u.bits(), <span class="kw-2">&</span>u64::from(bits)) |
| .to_usize() |
| .unwrap_or(core::usize::MAX); |
| <span class="kw">let </span><span class="kw-2">mut </span>res = Vec::with_capacity(digits); |
| |
| <span class="kw">for </span><span class="kw-2">mut </span>r <span class="kw">in </span>u.data[..last_i].iter().cloned() { |
| <span class="kw">for _ in </span><span class="number">0</span>..digits_per_big_digit { |
| res.push((r & mask) <span class="kw">as </span>u8); |
| r >>= bits; |
| } |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>r = u.data[last_i]; |
| <span class="kw">while </span>r != <span class="number">0 </span>{ |
| res.push((r & mask) <span class="kw">as </span>u8); |
| r >>= bits; |
| } |
| |
| res |
| } |
| |
| <span class="comment">// Extract bitwise digits that don't evenly divide BigDigit |
| </span><span class="kw">fn </span>to_inexact_bitwise_digits_le(u: <span class="kw-2">&</span>BigUint, bits: u8) -> Vec<u8> { |
| <span class="macro">debug_assert!</span>(!u.is_zero() && bits <= <span class="number">8 </span>&& big_digit::BITS % bits != <span class="number">0</span>); |
| |
| <span class="kw">let </span>mask: BigDigit = (<span class="number">1 </span><< bits) - <span class="number">1</span>; |
| <span class="kw">let </span>digits = Integer::div_ceil(<span class="kw-2">&</span>u.bits(), <span class="kw-2">&</span>u64::from(bits)) |
| .to_usize() |
| .unwrap_or(core::usize::MAX); |
| <span class="kw">let </span><span class="kw-2">mut </span>res = Vec::with_capacity(digits); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>r = <span class="number">0</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>rbits = <span class="number">0</span>; |
| |
| <span class="kw">for </span>c <span class="kw">in </span><span class="kw-2">&</span>u.data { |
| r |= <span class="kw-2">*</span>c << rbits; |
| rbits += big_digit::BITS; |
| |
| <span class="kw">while </span>rbits >= bits { |
| res.push((r & mask) <span class="kw">as </span>u8); |
| r >>= bits; |
| |
| <span class="comment">// r had more bits than it could fit - grab the bits we lost |
| </span><span class="kw">if </span>rbits > big_digit::BITS { |
| r = <span class="kw-2">*</span>c >> (big_digit::BITS - (rbits - bits)); |
| } |
| |
| rbits -= bits; |
| } |
| } |
| |
| <span class="kw">if </span>rbits != <span class="number">0 </span>{ |
| res.push(r <span class="kw">as </span>u8); |
| } |
| |
| <span class="kw">while let </span><span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">0</span>) = res.last() { |
| res.pop(); |
| } |
| |
| res |
| } |
| |
| <span class="comment">// Extract little-endian radix digits |
| </span><span class="attribute">#[inline(always)] </span><span class="comment">// forced inline to get const-prop for radix=10 |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>to_radix_digits_le(u: <span class="kw-2">&</span>BigUint, radix: u32) -> Vec<u8> { |
| <span class="macro">debug_assert!</span>(!u.is_zero() && !radix.is_power_of_two()); |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">let </span>radix_log2 = f64::from(radix).log2(); |
| <span class="attribute">#[cfg(not(feature = <span class="string">"std"</span>))] |
| </span><span class="kw">let </span>radix_log2 = ilog2(radix) <span class="kw">as </span>f64; |
| |
| <span class="comment">// Estimate how big the result will be, so we can pre-allocate it. |
| </span><span class="kw">let </span>radix_digits = ((u.bits() <span class="kw">as </span>f64) / radix_log2).ceil(); |
| <span class="kw">let </span><span class="kw-2">mut </span>res = Vec::with_capacity(radix_digits.to_usize().unwrap_or(<span class="number">0</span>)); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>digits = u.clone(); |
| |
| <span class="kw">let </span>(base, power) = get_radix_base(radix, big_digit::HALF_BITS); |
| <span class="kw">let </span>radix = radix <span class="kw">as </span>BigDigit; |
| |
| <span class="kw">while </span>digits.data.len() > <span class="number">1 </span>{ |
| <span class="kw">let </span>(q, <span class="kw-2">mut </span>r) = div_rem_digit(digits, base); |
| <span class="kw">for _ in </span><span class="number">0</span>..power { |
| res.push((r % radix) <span class="kw">as </span>u8); |
| r /= radix; |
| } |
| digits = q; |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>r = digits.data[<span class="number">0</span>]; |
| <span class="kw">while </span>r != <span class="number">0 </span>{ |
| res.push((r % radix) <span class="kw">as </span>u8); |
| r /= radix; |
| } |
| |
| res |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>to_radix_le(u: <span class="kw-2">&</span>BigUint, radix: u32) -> Vec<u8> { |
| <span class="kw">if </span>u.is_zero() { |
| <span class="macro">vec!</span>[<span class="number">0</span>] |
| } <span class="kw">else if </span>radix.is_power_of_two() { |
| <span class="comment">// Powers of two can use bitwise masks and shifting instead of division |
| </span><span class="kw">let </span>bits = ilog2(radix); |
| <span class="kw">if </span>big_digit::BITS % bits == <span class="number">0 </span>{ |
| to_bitwise_digits_le(u, bits) |
| } <span class="kw">else </span>{ |
| to_inexact_bitwise_digits_le(u, bits) |
| } |
| } <span class="kw">else if </span>radix == <span class="number">10 </span>{ |
| <span class="comment">// 10 is so common that it's worth separating out for const-propagation. |
| // Optimizers can often turn constant division into a faster multiplication. |
| </span>to_radix_digits_le(u, <span class="number">10</span>) |
| } <span class="kw">else </span>{ |
| to_radix_digits_le(u, radix) |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>to_str_radix_reversed(u: <span class="kw-2">&</span>BigUint, radix: u32) -> Vec<u8> { |
| <span class="macro">assert!</span>(<span class="number">2 </span><= radix && radix <= <span class="number">36</span>, <span class="string">"The radix must be within 2...36"</span>); |
| |
| <span class="kw">if </span>u.is_zero() { |
| <span class="kw">return </span><span class="macro">vec!</span>[<span class="string">b'0'</span>]; |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>res = to_radix_le(u, radix); |
| |
| <span class="comment">// Now convert everything to ASCII digits. |
| </span><span class="kw">for </span>r <span class="kw">in </span><span class="kw-2">&mut </span>res { |
| <span class="macro">debug_assert!</span>(u32::from(<span class="kw-2">*</span>r) < radix); |
| <span class="kw">if </span><span class="kw-2">*</span>r < <span class="number">10 </span>{ |
| <span class="kw-2">*</span>r += <span class="string">b'0'</span>; |
| } <span class="kw">else </span>{ |
| <span class="kw-2">*</span>r += <span class="string">b'a' </span>- <span class="number">10</span>; |
| } |
| } |
| res |
| } |
| |
| <span class="doccomment">/// Returns the greatest power of the radix for the given bit size |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">fn </span>get_radix_base(radix: u32, bits: u8) -> (BigDigit, usize) { |
| <span class="kw">mod </span>gen { |
| <span class="macro">include! </span>{ <span class="macro">concat!</span>(<span class="macro">env!</span>(<span class="string">"OUT_DIR"</span>), <span class="string">"/radix_bases.rs"</span>) } |
| } |
| |
| <span class="macro">debug_assert!</span>( |
| <span class="number">2 </span><= radix && radix <= <span class="number">256</span>, |
| <span class="string">"The radix must be within 2...256" |
| </span>); |
| <span class="macro">debug_assert!</span>(!radix.is_power_of_two()); |
| <span class="macro">debug_assert!</span>(bits <= big_digit::BITS); |
| |
| <span class="kw">match </span>bits { |
| <span class="number">16 </span>=> { |
| <span class="kw">let </span>(base, power) = gen::BASES_16[radix <span class="kw">as </span>usize]; |
| (base <span class="kw">as </span>BigDigit, power) |
| } |
| <span class="number">32 </span>=> { |
| <span class="kw">let </span>(base, power) = gen::BASES_32[radix <span class="kw">as </span>usize]; |
| (base <span class="kw">as </span>BigDigit, power) |
| } |
| <span class="number">64 </span>=> { |
| <span class="kw">let </span>(base, power) = gen::BASES_64[radix <span class="kw">as </span>usize]; |
| (base <span class="kw">as </span>BigDigit, power) |
| } |
| <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"Invalid bigdigit size"</span>), |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="num_bigint" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
