rust 3#rustc 1.98.1 (48a229cea 2026-09-01)m6GÂn62-64f5f36fb0927694RL.SAwjL-df1bddb45adbe94b1 Xr*-1ad4f876c768bda9<%Z>64V`-2d2ab9fb0fe1def5G g{(3iF-06449a08aaab5e30rustc_std_workspace_core{`"Ei%G-cb0d4d77988d81b5")pE͗E-3ec41d3a5a80a4a4 miniz_oxide8bž LƨJ-e44eaef1807e5fc0adler29lyA6P/D$UB-dca52f01a59c33e7 hashbrownX {e-143c77bb957d9940rustc_std_workspace_alloc _z%-145a318e0772276c std_detectK(0*8D?-f99feda5ce9e492arustc_demangle%jerV-cfd0ab54bb33760ecfg_if}λ՞Co-360da4ba13154744 addr2linecY\G--09755979c57b7e64gimliQ`Dy-9a1fede77fbbf2f0objectF λv.z-7ff85ea729a864ffmemchr]1<=UO-0e3477fb2664a277 jlToKG-549498e8b2e4d924 rstest_reusedL$Ltests,$&,$ H decoder_testsl$|,$ encoder_testsl$,K$Knaive,$,$,5$5,( $' ,) $) coverage_gaming|Z $Z ,R$Rchunked_encoderSink Error write_encoded_bytesChunkedEncoder'eengine  encodeBUF_SIZE CHUNK_SIZE  StringSink'astring  " " " display&&&&&&&&& Base64Display/ / //bytes/ &5 5 55 &: : ::& FormatterSink? ?'b?&C CC C readHdecoderIIIIIIIIII IBASE64_CHUNK_SIZEIDECODED_CHUNK_SIZEI DecoderReaderV VVV VinnerV b64_buffer\ V b64_offsetVb64_lenVdecoded_chunk_buffer` Vdecoded_offsetV decoded_lenVinput_consumed_lenVpadding_offsetIf fffIk kkk o o kflush_decoded_bufkread_from_delegatek decode_to_buft t t k into_innerIy yyy} Hwriteencoder  MAX_INPUT_LENMIN_ENCODE_CHUNK_SIZE EncoderWriter  delegate extra_input extra_input_occupied_len  output_occupied_lenpanicked     finishwrite_final_leftoverswrite_to_delegate write_all_encoded_output    flush encoder_string_writerEncoderStringWriter   from_consumer    StrConsumerconsumeUtf8SingleCodeUnitWriter str_consumer    general_purposedecodeGeneralPurposeEstimate conservative_decoded_len decoded_len_estimate decode_helper UNROLLED_INPUT_CHUNK_SIZEUNROLLED_OUTPUT_CHUNK_SIZEcomplete_quads_len decode_chunk_8 decode_chunk_4  decode_suffix    INVALID_VALUE ConfigDecodeEstimateinternal_encodeBLOCKS_PER_FAST_LOOP LOW_SIX_BITSLOW_SIX_BITS_U8internal_decoded_len_estimateinternal_decodeconfig encode_table   decode_table  read_u64 with_encode_paddingwith_decode_allow_trailing_bitswith_decode_padding_mode>encode_paddingSTANDARDSTANDARD_NO_PADURL_SAFEURL_SAFE_NO_PADPADNO_PAD  Engine  !!  encode_string encode_slice  decode_vec  decode_slice decode_slice_unchecked  " alphabet ALPHABET_SIZEfrom_str_unchecked  as_str ##CRYPTBCRYPT IMAP_MUTF7BIN_HEX   encode_engineencode_engine_stringencode_engine_sliceencode_with_padding encoded_len add_padding source decode_enginedecode_engine_vecdecode_engine_slice     PAD_BYTEGeneralPurpose! ! !GeneralPurposeConfig"decode_allow_trailing_bitsdecode_padding_mode  DecodePaddingMode Indifferent RequireCanonical  RequireNone DecodeMetadata   Alphabetsymbols  ParseAlphabetError InvalidLength DuplicatedByte UnprintableByte  ReservedByte     EncodeSliceErrorOutputSliceTooSmall  DecodeError InvalidByte 2 InvalidLastSymbol InvalidPadding  DecodeSliceError5 4     88888!8%8%8>8>8>8G8G8j8j8j8r8r8s8t8t8}8}8888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888    BFY g// 3 &4 &>χ   ??B&"Ua[ gVV Z I[I\I^I_I`IbIcIdIeIcp\[0x Eg  |>~ F F#F *,Lje F 8III4 K  `cg.!!!F <II."//ssvDJ JgJJJ000 NO%K KgKKKKK1aMiyLLLgL12:4%~gMMMMMM 8g2333B̓y NNNNgNN4)[zգgOOOOOgOO5256}ZgPPPPPgPP54ZBE gRRRRRgRRRP"C?:/fVyV I g g !K # 1 111 F\  o}.F F4  \l 4 wX,TX   PΪΪChunksѪoҪ chunk_sizeoS #ұXrw  QY   ,   X\"XD  [,| F"R , K  4   H\ \ TX \#X4 F#/ D%t FN 4      (  X<  #XX>IFTXz d !\  | ' (   , X   (  X<  _r 1zXmW %  H$ \   &  %ÜĜŜƜǜȜ_w\\uz   ![ÜĜŜƜǜȜ_w^f\ %bc!: <C &$b X,[, H$_<Y-YqY=řǙșəʙ˙G*R{9 [ Y[X<[ _X' ^XX[Kg_yXXm[}OD^c\bU[ _aXfcXX  sinkbufchunk. w  <!Q^\mXX YYqZw\@ wX]]r__aabVd\X1024d X%X9 DXT XWX X$ 'XKXM+X,X g;XX_XBUF_SIZE D4&f /D9// 3 &4 &>χD[, D4  o}.D K Ln  ? oT [L  24  D??B&"Ua[se  > oÜĜŜƜǜȜ_w\ĤĤŤ  :M n, ggg cghcثq1ȡLqD  o q[mv formatterGhK=qX1024X4X3XBUF_SIZEXDECODED_CHUNK_SIZE |    d  g   :  0  d   u X gR ,  d  eU % L  ul Xv , v TD   u XX!v , vcS9   u Xv , vUE- l   u Xv , vUE'   uĨ Xv , vUE5   u ! řǙșəʙ˙G*R{9 XX !v , v -  4  dO D  j "q\ VV Z I[I\I^I_I`IbIcIdIeIcp\[0xFF, s   dd DebugStructddd dd has_fieldsd19~<~~ ~~~~~u;uv Xuvu>v1 x<uvuvu?v2;uv {x}5uvvvPv1vvvvnv2vvvv|v|l   XX   XX$  řX VFF   X  X  X  X  X o }$ F4 X4 _*x{reader2 6aXBUF_SIZEXDECODED_CHUNK_SIZE X   X$T]  [&u' t D  wX+T + T] چ, !u6% X L  % D  X M 0 (d     X$ T] چ u% X   T] چK .uU%P  X d  #[a @ *̛ x X X    +X 3  X 5  x}JX| b |  xX|  O w   X  X 6XX! 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X t    d        X      <    X>$  řXl    b<      řX     $   \ 1  X t    \ L     X    X   \ .   \ E6ĥ     b        -  {l XL < XXXRXREX{XfX|$ PXPXhXXXX bytes_len complete_input_chunks complete_chunk_output A encoded_rem$ ($ O O",($  Fu+08$ Rq]eslus|H$  $ ,6>FO \f$ $ \ *( (/ B( 5X 5X6 (     ( 2X J( 5X 5X6(U   P PfXX(X0XX%__self_1 ˺ n X4 Xx:( (/7GuDIV[c( 5X 5XHuIv>Jv g ( 2X- 6> u0  <  v`ft z n( 5X 5XI uKv@ L v !4 OU\cqpɺysfuvv uv ouvvu%3˺J ˺ v+vvv.vH +: J!ɺ[ !h }"ɺ" #ɺ#$ɺ$ $2  ( %ɺ%5X &ɺ&5XX'ɺi'5XT(ɺe(5X| ( )ɺ)2X,*ɺ=*2XT`ns  ( +ɺ +5X ,ɺ ,5XX-ɺi -5XT.ɺe.5X|     $*39BP  !*09G /ɺɺffɺɺff&f.f6|Ykr{gpypM_foxɺɺ ɺɺɺ%ɺ.ɺ7ɺ@ɺIɺRɺ[ɺdɺmɺv  ˺  __arg1_1˺<'f!   \ɺ#,6( $+ >X 5P" P3;   R RfɺP ( $+3Fu@ERW_X 5PJ u.:vh  qsfɺu'v ɺuAKYq|v!H +: J [ hyX  5P,= 5PT  `  ns ɺɺ   ffffɺ+ɺ4=F1:CLV ds     \&0D  ˿ 4  I=, l  f  , ˿8II˿I I 4  4 , l    , 4  H T  4 , 4 ̈    , 4 4 !Θ% (`"" d"  4" ," 4" " " ! " ,! [4" 4"   $ '_=Xb'='t# 'N2X9@|# 'N2X9@d$ 'N2X9@\ *P5X<XCJl 'P2X9@ *P5X<XCJ\ 'R2P9@&H,K$4M 4N )lN *O *O +\O 4O4P ,lP ,P -Q Q 5\Q6QRLI Correct, fast, and configurable [base64][] decoding and encoding. Base64MKH transports binary data efficiently in contexts where only plain text isd allowed.FC [base64]: https://developer.mozilla.org/en-US/docs/Glossary/Base64\ # UsageLI Use an [`Engine`] to decode or encode base64, configured with the base64B? alphabet and padding behavior best suited to your application. ## Engine setupKH There is more than one way to encode a stream of bytes as “base64”.1. Different applications use different encoding'$ [alphabets][alphabet::Alphabet] andGD [padding behaviors][engine::general_purpose::GeneralPurposeConfig].̣ ### Encoding alphabetKH Almost all base64 [alphabets][alphabet::Alphabet] use `A-Z`, `a-z`, andPM `0-9`, which gives nearly 64 characters (26 + 26 + 10 = 62), but they differ%" in their choice of their final 2.OL Most applications use the [standard][alphabet::STANDARD] alphabet specifiedOL in [RFC 4648][rfc-alphabet]. If that’s all you need, you can get started'$ quickly by using the pre-configuredSP [`STANDARD`][engine::general_purpose::STANDARD] engine, which is also available JG in the [`prelude`] module as shown here, if you prefer a minimal `use`t footprint. , \ ```  use base64::prelude::*;  41 # fn main() -> Result<(), base64::DecodeError> { LI assert_eq!(BASE64_STANDARD.decode(b"+uwgVQA=")?, b"\xFA\xEC\x20\x55\0"); JG assert_eq!(BASE64_STANDARD.encode(b"\xFF\xEC\x20\x55\0"), "/+wgVQA=");d # Ok(())<  # }<  ```  KH [rfc-alphabet]: https://datatracker.ietf.org/doc/html/rfc4648#section-4  DA Other common alphabets are available in the [`alphabet`] module.Ԏ #### URL-safe alphabetNK The standard alphabet uses `+` and `/` as its two non-alphanumeric tokens,MJ which cannot be safely used in URL’s without encoding them as `%2B` andT `%2F`.YV To avoid that, some applications use a [“URL-safe” alphabet][alphabet::URL_SAFE],MJ which uses `-` and `_` instead. To use that alternative alphabet, use thePM [`URL_SAFE`][engine::general_purpose::URL_SAFE] engine. This example doesn'tGD use [`prelude`] to show what a more explicit `use` would look like.,\A> use base64::{engine::general_purpose::URL_SAFE, Engine as _};4EB assert_eq!(URL_SAFE.decode(b"-uwgVQA=")?, b"\xFA\xEC\x20\x55\0");C@ assert_eq!(URL_SAFE.encode(b"\xFF\xEC\x20\x55\0"), "_-wgVQA=");d<<ԩ ### Padding charactersNK Each base64 character represents 6 bits (2⁶ = 64) of the original binaryHE data, and every 3 bytes of input binary data will encode to 4 base6452 characters (8 bits × 3 = 6 bits × 4 = 24 bits).NK When the input is not an even multiple of 3 bytes in length, [canonical][]LI base64 encoders insert padding characters at the end, so that the output%" length is always a multiple of 4:JG [canonical]: https://datatracker.ietf.org/doc/html/rfc4648#section-3.5,\A> use base64::{engine::general_purpose::STANDARD, Engine as _};,) assert_eq!(STANDARD.encode(b""), "");0- assert_eq!(STANDARD.encode(b"f"), "Zg==");0- assert_eq!(STANDARD.encode(b"fo"), "Zm8=");0- assert_eq!(STANDARD.encode(b"foo"), "Zm9v");<NK Canonical encoding ensures that base64 encodings will be exactly the same,MJ byte-for-byte, regardless of input length. But the `=` padding charactersGD aren’t necessary for decoding, and they may be omitted by using a>; [`NO_PAD`][engine::general_purpose::NO_PAD] configuration:,\HE use base64::{engine::general_purpose::STANDARD_NO_PAD, Engine as _}; 30 assert_eq!(STANDARD_NO_PAD.encode(b""), ""); 52 assert_eq!(STANDARD_NO_PAD.encode(b"f"), "Zg"); 63 assert_eq!(STANDARD_NO_PAD.encode(b"fo"), "Zm8");!74 assert_eq!(STANDARD_NO_PAD.encode(b"foo"), "Zm9v");` and0OL `encode` returns a `String`. To instead decode or encode into a buffer that063 you allocated, use one of the alternative methods:11 #### Decoding11b_ | Method | Output | Allocates memory |2b_ | -------------------------- | ----------------------------- | ----------------------------- |2b_ | [`Engine::decode`] | returns a new `Vec` | always |3b_ | [`Engine::decode_vec`] | appends to provided `Vec` | if `Vec` lacks capacity |4HE | [`Engine::decode_slice`] | writes to provided `&[u8]` | never55 #### Encoding55b_ | Method | Output | Allocates memory |5b_ | -------------------------- | ---------------------------- | ------------------------------ |6b_ | [`Engine::encode`] | returns a new `String` | always |7b_ | [`Engine::encode_string`] | appends to provided `String` | if `String` lacks capacity |8b_ | [`Engine::encode_slice`] | writes to provided `&[u8]` | never |99 ## Input and output9996 The `base64` crate can [decode][Engine::decode()] and930 [encode][Engine::encode()] values in memory, or:.+ [`DecoderReader`][read::DecoderReader] and:JG [`EncoderWriter`][write::EncoderWriter] provide streaming decoding and;LI encoding for any [readable][std::io::Read] or [writable][std::io::Write]; byte stream.;;<,<\<< # use std::io; Result<(), Box> {>  let mut input = io::stdin();>@= let mut decoder = DecoderReader::new(&mut input, &STANDARD);>/, io::copy(&mut decoder, &mut io::stdout())?;d? let mut encoder = EncoderWriter::new(&mut output, &STANDARD);B.+ io::copy(&mut io::stdin(), &mut encoder)?;dB If you only need a base64 representation for implementing theC-* [`Display`][std::fmt::Display] trait, useD.+ [`Base64Display`][display::Base64Display]:D let value = Base64Display::new(b"\0\x01\x02\x03", &STANDARD);EA> assert_eq!("base64: AAECAw==", format!("base64: {}", value));χ34EG|,&//  [&|&//  o}. D0 6 78867 4D9F63 Create a `Base64Display` with the provided engine.  DDB55 9  D .7 :7< ; <=<=; 4D>g>$&B D ggg cghcثq1ȡqB: : >  D$sK9 l & @AA@  ģ 턱 D"Ua[B  ; &??  ggg cghcثq1ȡ G DEDE DFG G  T , CCr L  D [ÜĜŜƜǜȜ_w\ DBC C G $ < dMA> Implementations of `io::Read` to transparently decode base64.|L$MLL"$MIlfV\B@.0 D X  IX  IX4 T Q A `Read` implementation that decodes base64 data read from an underlying reader. t # Examples <   use std::io::Read;  use std::io::Cursor;( % use base64::engine::general_purpose; a ^ // use a cursor as the simplest possible `Read` -- in real code this is probably a file, etc.6 3 let mut wrapped_reader = Cursor::new(b"YXNkZg==");7 4 let mut decoder = base64::read::DecoderReader::new(  &mut wrapped_reader,$ ! &general_purpose::STANDARD); * ' // handle errors as you normally would  let mut result = Vec::new();. + decoder.read_to_end(&mut result).unwrap(); % " assert_eq!(b"asdf", &result[..]); < l  WXYXWYF  F  4 FD l Ecp\[0xZ[\^_`bcde Z\WYE4 IVVD , IVVFԤ T IVVX]D X T IVVXt < IVVX.  IVVXa X t IVVX \ IVVX̚  IVVX t IVV{G  ghighi    4 D Ejgj .0354   E ggg cghcثq1ȡqBf  f j FF$ >8  lmnnml    4 D Eorstx /146, E B Create a new decoder that will read from the provided reader `r`. FEBkk o FFA AD ooX ooXD  I E [Bk  k r FF$ hG#5 # I EBk $ k s FF$$ )Z l) I EX [Bk ) k t FF'gXhX,. tuuuut; tvvvvtD@ twwwwtӬE BY V Unwraps this `DecoderReader`, returning the base reader which it reads base64 encoded|C input from.C CY V Because `DecoderReader` performs internal buffering, the state of the inner reader isD[ X unspecified. This function is mainly provided because the inner reader type may provideEX U additional functionality beyond the `Read` implementation which may still be useful.TE EFBkk x FF jFE  z{||z{ F  F 4F DF E}}F .035J7 F) & Decode input from the wrapped reader.G G] Z Under non-error circumstances, this returns `Ok` with the value being the number of bytesH  written in `buf`.H H^ [ Where possible, this function buffers base64 to minimize the number of read() calls to theI  delegate reader.I dI # ErrorsI IZ W Any errors emitted by the delegate reader are returned. Decoding errors due to invalidJI F base64 are also possible, and will have `io::ErrorKind::InvalidData`.$J  E [By J y } FF$J h|` }}XW(lMB? Implementations of `io::Write` to transparently handle base64.|M$MMM",Ml\\C@-/Y Dj XԻ l X"  X5 ^ [ A `Write` implementation that base64 encodes data before delegating to the wrapped writer. _ \ Because base64 has special handling for the end of the input data (padding, etc), there's a\ Y `finish()` method on this type that encodes any leftover input bytes and adds padding if` ] appropriate. It's called automatically when deallocated (see the `Drop` implementation), but` ] any error that occurs when invoking the underlying writer will be suppressed. If you want to1 . handle such errors, call `finish()` yourself. t  <   use std::io::Write;(  _ \ // use a vec as the simplest possible `Write` -- in real code this is probably a file, etc.\ Y let mut enc = base64::write::EncoderWriter::new(Vec::new(), &general_purpose::STANDARD);  *  $ ! enc.write_all(b"asdf").unwrap();  C @ // could leave this out to be called by Drop, if you don't care @ = // about handling errors or getting the delegate writer back ) & let delegate = enc.finish().unwrap();  ' $ // base64 was written to the writer + ( assert_eq!(b"YXNkZg==", &delegate[..]); <  d   _ \ Calling `write()` (or related methods) or `finish()` after `finish()` has completed without $ ! error is invalid and will panic. d   _ \ Base64 encoding itself does not generate errors, but errors from the wrapped writer will be, ) returned as per the contract of `Write`.   # Performance V S It has some minor performance loss compared to encoding slices (a couple percent).' $ It does not do any heap allocation.   # Limitations ` ] Owing to the specification of the `write` and `flush` methods on the `Write` trait and their] Z implications for a buffering implementation, these methods may not behave as expected. In_ \ particular, calling `write_all` on this interface may fail with `io::ErrorKind::WriteZero`.R O See the documentation of the `Write` trait implementation for further details.l    G  4  GL l F|>~ ac^`L4  D ؘ( \ X X  X 4 XD XԦ  Xt D H    ɒ  4 L Fg 02574   F ggg cghcثq1ȡqB    FG$ 9    ɒ  4 L F 79<>A I F Create a new encoder that will write to the provided delegate writer. GFB  FGɋ ҋ! XD" X(% "\ Y Encode all remaining buffered data and write it, including any trailing incomplete input## triples and associated padding.# #N K Once this succeeds, no further writes or calls to this method are allowed.$ $_ \ This may write to the delegate writer multiple times if the delegate writer does not accept%6 3 all input provided to its `write` each invocation.% &] Z If you don't care about error handling, it is not necessary to call this function, as the&5 2 equivalent finalization is done by the Drop impl.' '8 5 Returns the writer that this was constructed around.' d' ' (M J The first error that is not of `ErrorKind::Interrupted` will be returned.4(  FB (   FG$( ,1 ,  FB -   FG$- 7H 7  FXB 7   FGv0T: B4 İB  FB B   FG$B M G[ X Unwraps this `EncoderWriter`, returning the base writer it writes base64 encoded output for more on that.R R_ \ If the previous call to `write` provided more (encoded) data than the delegate writer couldS_ \ accept in a single call to its `write`, the remaining data is buffered. As long as bufferedS^ [ data is present, subsequent calls to `write` will try to write the remaining buffered dataT_ \ to the delegate and return either `Ok(0)` -- and therefore not consume any of `input` -- orlU an error.U dU U U; 8 Any errors emitted by the delegate writer are returned.,V  F [B V   FG]   ! Y V Because this is usually treated as OK to call multiple times, it will *not* flush any0 - incomplete chunks of input or write padding.d ҂ ڂO L The first error that is not of [`ErrorKind::Interrupted`] will be returned.,  FB    FG$ B    ɒ  4 L F# 579; $  F\B Ņ   FG$ʅ PTl$46G='.~ F A   4 \ G +-02 < PM Create a EncoderStringWriter that will append to the provided `StrConsumer`.l HGB  FH~  [X Encode all remaining buffered data, including any trailing incomplete input triples and associated padding.DA Returns the base64-encoded form of the accumulated written data.TGHB  FH$6  4*,Lje FHOQ!_\ Create a EncoderStringWriter that will encode into a new `String` with the provided config.B  F O   4\G  ;=@B4, G [B   FH$hp%, GB   FH$GD An abstraction around consuming `str`s produced by base64 encoding.\p!!,) Consume the base64 encoded data in `buf`<  \B  $h4NK As for io::Write, `StrConsumer` is implemented automatically for `&mut S`.8H4H\H  < H \B  8H$h܋-* Pushes the str onto the end of the StringH < H \B  $h/İI I\H,.|dI> \H  %'4, H [B  I$h%, HB  I$$to0t=d0g0X0[0tMIF Provides the [Engine] abstraction and out of the box implementations.4M |z* 4+\ 5\6C4I=.t.sT$gSJ$, |$̉$,$$t'%#!FDB@E B Provides the [GeneralPurpose] engine and associated config types.|'DW 1Do 4 1t / 6 <  ,J e J9 {}jlY[ H 4 l+ t:1tJ/Z5\r6.D ,z|jlZ\FH24!t4I`cTXXܠI-XIB +\.I' IXB  $l [I [ KB  ,D  4 !d /  padding_moded  X & X 'Ԗ X"" [XX B " ," input_len_reml" output_lenT"!d##X/t/ [X  [B 0 ,/index_at_start_of_input0!d0 400XAtA [X  [B B ,AB!dB 4BBX l l+ 1t:/J5\b6o.D ,vxfhVXBD.0l [X [X KB  , input_index\ 4 output_indexd!d/ԲdX X " l X IK 8 5 Create a `GeneralPurpose` engine from an [Alphabet]. J G While not very expensive to initialize, ideally these should be cached* ' if the engine will be used repeatedly.  MJIB  '\!e % I\ 4 J t I C |  I [ [XB  $ ,  4 ! X d ̙4 |4 XAQ A  IXIB A  $A  input_lenLA B |B  I [ [B B  $B ,B  4C DC E! 4E  I IB E  $E GA dG  MB G 'G XH XKB dK  MB L 'L XL XO DP  [B P  P ̕U JԪX U\ Y Create a new config with `padding` = `true`, `decode_allow_trailing_bits` = `false`, andVG D `decode_padding_mode = DecodePaddingMode::RequireCanonicalPadding`.V V\ Y This probably matches most people's expectations, but consider disabling padding to saveWZ W a few bytes unless you specifically need it for compatibility with some legacy system.X JB^= ZJ G Create a new config based on `self` with an updated `padding` setting.[ [_ \ If `padding` is `true`, encoding will append either 1 or 2 `=` padding characters as needed[9 6 to produce an output whose length is a multiple of 4.\ \^ [ Padding is not needed for correct decoding and only serves to waste bytes, but it's in the]F C [spec](https://datatracker.ietf.org/doc/html/rfc4648#section-3.2).] ]_ \ For new applications, consider not using padding if the decoders you're using don't require^  padding to be present._ JJBdG `] Z Create a new config based on `self` with an updated `decode_allow_trailing_bits` setting.` aX U Most users will not need to configure this. It's useful if you need to decode base64aX U produced by a buggy encoder that has bits set in the unused space on the last base64bg d character as per [forgiving-base64 decode](https://infra.spec.whatwg.org/#forgiving-base64-decode).cL I If invalid trailing bits are present and this is `true`, those bits willcO L be silently ignored, else `DecodeError::InvalidLastSymbol` will be emitted.d JJB lL eV S Create a new config based on `self` with an updated `decode_padding_mode` setting.f f\ Y Padding is not useful in terms of representing encoded data -- it makes no difference tog_ \ the decoder if padding is present or not, so if you have some un-padded input to decode, ithZ W is perfectly fine to use `DecodePaddingMode::Indifferent` to prevent errors from beingdi emitted.i i  However, since in practicei  [people who learned nothing from BER vs DER seem to expect base64 to have one canonical encoding](https://eprint.iacr.org/2022/361),jU R the default setting is the stricter `DecodePaddingMode::RequireCanonicalPadding`.k kY V Or, if "canonical" in your circumstance means _no_ padding rather than padding to thelI F next multiple of four, there's `DecodePaddingMode::RequireNoPadding`.l JKJB:Cn% Jn n- * Delegates to [GeneralPurposeConfig::new].,>  [ [B ?4@4@  :CL >IJD&# Decode the input into a new `Vec`.DlEE\EټEIF use base64::{Engine as _, alphabet, engine::{self, general_purpose}};EF)& let bytes = general_purpose::STANDARDF1. .decode("aGVsbG8gd29ybGR+Cg==").unwrap();F println!("{:?}", bytes);GԓG // custom engine setupG0- let bytes_url = engine::GeneralPurpose::new(G%" &alphabet::URL_SAFE,H)& general_purpose::NO_PAD)H30 .decode("aGVsbG8gaW50ZXJuZXR-Cg").unwrap();H  println!("{:?}", bytes_url);::new();U" // with the default engineU! general_purpose::STANDARDVGD .decode_vec("aGVsbG8gd29ybGR+Cg==", &mut buffer,).unwrap();V! println!("{:?}", buffer);WW buffer.clear();WW // with a custom engineW! CUSTOM_ENGINE.decode_vec(W'$ "aGVsbG8gaW50ZXJuZXR-Cg==",ĥX &mut buffer,X ).unwrap();X!,Y The minimal level of configuration that engines must support.4yy"~!yGD Returns `true` if padding should be added after the encoded output.zzOL Padding is added outside the engine's encode() since the engine may be usedzNK to encode only a chunk of the overall output, so it can't always know when{JG the output is "done" and would therefore need padding (if configured).t~ B ~ $~Ԁ~b_ The decode estimate used by an engine implementation. Users do not need to interact with this;'$ it is only for engine implementors.a^ Implementors may store relevant data here when constructing this to avoid having to calculate&# them again during actual decoding.tހԀ#ȃ(]Z Returns a conservative (err on the side of too big) estimate of the decoded length to useՁ$! for pre-allocating buffers, etc.ZW The estimate must be no larger than the next largest complete triple of decoded bytes.^[ That is, the final quad of tokens to decode may be assumed to be complete with no padding.˃ XB  $LMX{LB  decoded_bytesl padding_indexltM̈́NNK Provides [Alphabet] and constants for alphabets commonly used in the wild.DN.D[  ;Encode arbitrary octets as base64 into a supplied `String`.   See [Engine::encode_string]. $  $  Use Engine::encode_stringܳ C   ܡ - H \B ͠  4 \  CEHJ   <     See [Engine::encode_slice]. Use Engine::encode_sliceԴ B   - [ B ͠  4 \ // -CEHJ   [ [ X\B  4 4   ̤  J Z W Calculate the base64 encoded length for a given input length, optionally including any  appropriate padding bytes. ^ [ Returns `None` if the encoded length can't be represented in `usize`. This will happen forK H input lengths in approximately the top quarter of the range of `usize`.\ X{Buu Q \! X [XB ! _unpadded_output_len!  4! %& Og%8 %  O ggg cghcثq1ȡqB %  $%  & '& |' $' ' '" OlNN$N̾NN$&$" #FDB@1"fdb`?lO47(+TP4P#D% t/ $4? } C c, l  ln\^|q R $e Q H$ nL `T | $  " s ! Pg 4   P ggg cghcثq1ȡqB  $  ! | $  " P& Rg8   R ggg cghcثq1ȡqB   $   & | $  " R9 4  RřǙșəʙ˙G*R{9  B   $ + R $ PRB   G : 7 Decode base64 using the [`STANDARD` engine](STANDARD).   See [Engine::decode]. $ ̳ $  Use Engine::decode < 4  Ǹ -B  \  p H E Decode from string reference as octets using the specified [Engine]. ̄  - *Returns a `Result` containing a `Vec`. $ ̒ $  Ǹ  < l  Ǹ - B  ͠    4 \  8:=? + ( Decode from string reference as octets.   See [Engine::decode_vec]. $ ̔ $  Use Engine::decode_vec @    -  B  ͠    4 \ Θ @BEG!  4     See [Engine::decode_slice]. Use Engine::decode_sliceԤ! B !   - [ B " ͠ !  ! 4! \!     ?ADF(8 "c ` Returns a conservative estimate of the decoded size of `encoded_len` base64 symbols (rounded up#* ' to the next group of 3 decoded bytes).$ $b _ The resulting length will be a safe choice for the size of a decode buffer, but may have up to$4 1 2 trailing bytes that won't end up being needed.% t% % <% %% " use base64::decoded_len_estimate;% %+ ( assert_eq!(3, decoded_len_estimate(1));&+ ( assert_eq!(3, decoded_len_estimate(2));&+ ( assert_eq!(3, decoded_len_estimate(3));&+ ( assert_eq!(3, decoded_len_estimate(4));'0 - // start of the next quad of encoded symbols'+ ( assert_eq!(6, decoded_len_estimate(5));<' ( XXB +\( lPP$P̭PP$]&$" zkFDB@yfdb`lQsvgj|R/, Preconfigured engines for common use cases.04if These are re-exports of `const` engines in [crate::engine::general_purpose], renamed with a `BASE64_`C@ prefix for those who prefer to `use` the entire path to a name.t,\?< use base64::prelude::{Engine as _, BASE64_STANDARD_NO_PAD};PM assert_eq!("c29tZSBieXRlcw", &BASE64_STANDARD_NO_PAD.encode(b"some bytes"));< ; // further customize using `.with_*` methods as needed Each [Engine] must support at least the behavior indicated byGD [DecodePaddingMode::RequireCanonical], and may support other modes.3K NO%\XU Canonical padding is allowed, but any fewer padding bytes than that is also allowed.3jK}K͇TQ Padding must be canonical (0, 1, or 2 `=` as needed to produce a 4 byte suffix).3fKy{K\ƈ^[ Padding must be absent -- for when you want predictable padding, without any wasted bytes.3pKK!!!K!K!! KKB ! ȅK|!Kg|!|! K ggg cghcثq1ȡqB΅ |!|!"K"K"" K KBՅ " "#K#### K\B #̪ֈ30 Metadata about the result of a decode operation4tLaMiy\XҊ(t݊{$L$L$$ L LB $ $(%L(%(%(%(% L\B (%n%Lgn%n% L ggg cghcثq1ȡqB n%n% JG An alphabet defines the 64 ASCII characters (symbols) used for base64.DA Common alphabets are provided as constants, and custom alphabetsDA can be made via `from_str` or the `TryFrom` implementation.t)& Building and using a custom Alphabet:<~{ let custom = base64::alphabet::Alphabet::new("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/").unwrap();52 let engine = base64::engine::GeneralPurpose::new( &custom,.+ base64::engine::general_purpose::PAD);< Building a const:<# use base64::alphabet::Alphabet; static CUSTOM: Alphabet = {?< // Result::unwrap() isn't const yet, but panic!() is OKa^ match Alphabet::new("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/") { Ok(x) => x,<9 Err(_) => panic!("creation of alphabet failed"),L }4 };< Building lazily: <   use base64::{ܱ  alphabet::Alphabet, HE engine::{general_purpose::GeneralPurpose, GeneralPurposeConfig},4    use once_cell::sync::Lazy;  0- static CUSTOM: Lazy = Lazy::new(|| b_ Alphabet::new("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/").unwrap()4  );< 5D M:4%~ '< Xl XY'MY'Y' MMB  Y''Mg'' M ggg cghcثq1ȡqB  '' )M ) ) ) ) M\B   )X)M)M)) M MB  ) )ܨ"!A> Possible errors when constructing an [Alphabet] from a `str`.6"NB̓y XNBXNBXNBl""$! Alphabets must be 64 ASCII bytes64NGIN# All bytes must be unique60 HLXNBކ #XI#;8 All bytes must be printable (in the range `[32, 126]`).6 XNB $X$ `=` cannot be used6 XNB $X;Ng;; N ggg cghcثq1ȡqB" ;;F?NF?F?F?F? N\B" F??N?N?? N NB" ? ?$ $6 3 Errors that can occur while encoding into a slice.=$ O)[zգ% %$ ! The provided slice is too small.=4OGIO-O.. OOB$  Q..Og9.=. O ggg cghcثq1ȡqB$  ..C.OW.Ow.{. O OB$  . .Y.Ox.~... O\B$  . ) & Errors that can occur while decoding.?\ P}ZXXPBXPBXXPBW T An invalid byte was found in the input. The offset and offending byte are provided. [ X Padding characters (`=`) interspersed in the encoded form are invalid, as they may only. + be present as the last 0-2 bytes of input. Z W This error may also indicate that extraneous trailing input bytes are present, causingD A otherwise valid padding to no longer be the last bytes of input.? XXPBי , X XM J The length of the input, as measured in valid base64 symbols, is invalid.5 2 There must be 2-4 symbols in the last input quad.? XPB , X` ] The last non-padding input symbol's encoded 6 bits have nonzero bits that will be discarded.8 5 This is indicative of corrupted or truncated Base64.Y V Unlike [DecodeError::InvalidByte], which reports symbols that aren't in the alphabet, [ X this error is for symbols that are in the alphabet but represent nonsensical encodings.? .2XXPBԟ , X Xt  X U The nature of the padding was not as configured: absent or incorrect when it must be 6 3 canonical, or present when it must be absent, etc.?PP5P55 PPB  5V3Pgu3y3 P ggg cghcثq1ȡqB  4#4O0Pc0P00 P PB  0 0k)P)))) P\B  )̣ 6 3 Errors that can occur while decoding into a slice.D RZBE PRB  A [DecodeError] occurredDI aePRBߨ \ P $  DR')R +R?+C+ RRB  +p*Rg** R ggg cghcثq1ȡqB  5+=+)R)R)) R RB  =* E*z'R'''' R\B  (,- ,-,- ,- ,-$,-,- ,-o,- ,-L,-z,- ,-,-  ,-L ,-,-  ,-,-),- ) ,-+,- K ,-E,-  ,-L ,-b,-,-,-,-,- V ,-,-,-,- ,-`,-,- ,- ,-,- ,-I,- ,-,- ,-,- ,-,- ,- ,-Ԣ,- #,-+,- 0,- 0,-,- B,- B,-I,- ,- ,-t-,-z-,-,--,-,-,- ,- ,-!,-,- B ,- C ,-1,-,-x,- ,-M*,-x),-~),-,-,-,- ,- ,-5,-M|,- ,- ,-{,-x,-w,- ',-t,- 2,-t,- 2,- 3,-o,- >,-o,- ?,- ?,-k,--k,- J,-!f,- Z,-oe,- Z,- [,-3b,- i,-a,- i,- j,-^,- r,-I^,- s,- s,-;[,-W,-&,-%,-%,-|!,-]%,-c%,-$,-#,-#,-#,-B",-H",-n%,-,-Z,-`,-',-,-3,-9,-LV,-EU,-T,- ,-S,-,-,-;,- ,-w,-},- S,- %,-%,-%K,-xI,- ,-/H,- ,-cG,-  ,-  ,-WE,-v,-,-,-A,-&,-,,-,-D,- & ,-& ,-c ,- ,- ,-=,- ,- ,-,-RB,- ,-L ,-,-,-,-/1,-t,-z,-,-A,-  ,- ,-@,-=,-:<,-  ,-:,- " ,-5k$'readable std::io::Readu alphabets alphabet::Alphabetpadding behaviorsengine::general_purpose::NO_PAD'engine::general_purpose::GeneralPurpose padding moderead::DecoderReaderwrite::EncoderWriter $# 8https://developer.mozilla.org/en-US/docs/Glossary/Base64ָ  #!engine::general_purpose::URL_SAFE   uEngine::encode_slice   #Һ ָ #alphabet::URL_SAFE   uEngine::encode_string  V# #Һ #“URL-safe” alphabetļ   Engine::decode_slice  H #!engine::general_purpose::STANDARDɽ ļ Engine::decode_vec   &display::Base64Display #-https://datatracker.ietf.org/doc/html/rfc4648  ɽ Engine::encode  std::fmt RFC 4648п  Engine::decode  std::fmt::Display  /alphabet::STANDARD п engine::GeneralPurposeConfig   std::io::Write  ,standard   padding configuration  writable  g engine::general_purpose  engine::GeneralPurpose  std::io     -engine::general_purpose::GeneralPurposeConfig  engine::DecodePaddingMode   '             $'           ErrorKind::Interrupted ˆ 0$.#https://tools.ietf.org/html/rfc4648 crate::decoded_len_estimate general_purpose::STANDARD_NO_PAD Engine::decode()Engine::decode_slice_unchecked#DecodePaddingMode::RequireCanonical 'Engine::internal_decoded_len_estimate()/%Engine::internal_decoded_len_estimate$.RFC          /  $.         /  -п .#https://infra.spec.whatwg.org/_people who learned nothing from BER vs DER seem to expect base64 to have one canonical encoding https://eprint.iacr.org/2022/361#GeneralPurposeConfig::new.'ļ  specforgiving-base64 decode1# .п    #  . 'ļ    #1п . #  .  'ļ    1п BinHex 4.0 Definition9http://files.stairways.com/other/binhex-40-specs-info.txtRFC 3501#https://tools.ietf.org/html/rfc3501 1п   1п      1$  STANDARD engine # $    #$    #$ 5  # DecodeError::InvalidByte  $   5 #$ 5   #  crate::enginecrate::engine::general_purpose      ####!!!PQPPQ6  ####!!!PQPPQ6  ####!!!PQPPQ6  ####!!!PQPPQ6  ####!!!PQPPQ6  ####!!!PQPPQ6  ####!!!PQPPQ6 DecoderReader b64_offset b64_lendecoded_chunk_bufferdecoded_offset decoded_len input_consumed_lenpadding_offset&assertion failed: self.decoded_len > 0&!assertion failed: !buf.is_empty()!assertion failed: copy_len > 0.assertion failed: copy_len <= self.decoded_len.7assertion failed: self.decoded_len < DECODED_CHUNK_SIZE7;assertion failed: self.b64_offset + self.b64_len < BUF_SIZE;= b64_len_to_decode3&buf is sized correctly in calling code&-assertion failed: self.b64_offset <= BUF_SIZE-lassertion failed: if self.b64_offset == BUF_SIZE { self.b64_len == 0 } else { self.b64_len <= BUF_SIZE }lassertion failed: if self.decoded_len == 0 { self.decoded_offset <= DECODED_CHUNK_SIZE } else { self.decoded_offset < DECODED_CHUNK_SIZE }Nassertion failed: self.decoded_len + self.decoded_offset <= DECODED_CHUNK_SIZENassertion failed: at_eof[assertion failed: if at_eof { self.b64_len > 0 } else { self.b64_len >= BASE64_CHUNK_SIZE }[assertion failed: decoded <= 3too many chunksIassertion failed: b64_bytes_that_can_decode_into_buf >= BASE64_CHUNK_SIZEIT extra_input:  extra_input_occupied_len: output[..5]:  output_occupied_len: T'Encoder has already had finish() called'Writer must be presentbuffer is large enough0assertion failed: consumed <= current_output_len0(Cannot write more after calling finish()(3assertion failed: self.extra_input_occupied_len < 33*assertion failed: extra_input_read_len > 0*8assertion failed: encoded_size == 0 || encoded_size == 48nassertion failed: MAX_INPUT_LEN == max_input_len || MAX_INPUT_LEN == max_input_len + MIN_ENCODE_CHUNK_SIZEn'Writing to a consumer should never fail'Input must be valid UTF-8GeneralPurpose encode_table decode_table configGeneralPurposeConfigencode_paddingdecode_allow_trailing_bitsdecode_padding_mode-integer overflow when calculating buffer size- Invalid UTF8 "Writing to a String shouldn't fail"+usize overflow when calculating buffer size+Vec is sized conservatively.Overflow when calculating output buffer length.Output slice is too small RequireNone RequireCanonical Indifferent DecodeMetadataAlphabetsymbols ReservedByte UnprintableByteDuplicatedByte InvalidLength @ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/@@ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_@@./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz@@./ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789@@ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+,@@!"#$%&'()*+,-012345689@ABCDEFGHIJKLMNPQRSTUVXYZ[`abcdefhijklmpqr@*usize overflow when calculating b64 length*OutputSliceTooSmallInvalidPaddingInvalidLastSymbol InvalidByte DecodeError (b} 0`|qثN_+&/iIyM$9Τ:ߌ@\̷DׄO8J#д3 eGEXN8=FZz^~uVUյv_.l:Ilw|eNHMbhqxf@8#Lc>cd#R{]KǨ@RKE^Cd򡗧FtB\އT)Nx4F>7.M9ughMK]'XpoYgPX+Pe;dGAhl% l3^UL8ꮳy3\Ne>=9@ j;;#HW#ʀ;L7|,3=ߋ>.ww~@9foPDC5y%zNn@~uw+!.X9$'w0zFg)ju J9$cj>SSOy U\V._ܪ8<šϱ{2.wVعB/E'(G $?#c(\`},j[ԬCܕ{HP;p!9H&Zz B"G,ž 3j<3=K)!6'tiʟ{}_nT z>h< D:kLfb4e~ 3@3sU%Ywf]{Tv 0=~bh q Z-FZMND1qQНZyطN#va9mbg}g';t%$i >=i!sI rqbhyTs>]!^zW%ֲLEDROH=w4ET۸@ֵ<{3sq[wƊN:^rX'ɸ#~Z9|der*[}4YdL"#3rξA^[4nͶB߮K.$'t;o~ 7(V{)[J56O}4c qxFqهImLb#ʙD9K5]'.ѳ:s & (Nj0g@`kOz|^|nO uWE~1]`lu"Q1 SOT*#44wW TBNN"T{(S25`[,OpR>97lA-yF7pOAuB%9EC7muaߖi:mA{GdM`MK!jEUZJ($|+Uwhl$>i73.3e;~LUI(;ivIaOYU̖s:r,uVp}j{GD/drs gu{a[ڳ{[U)C 'K&䪴=dEwC/5&]",&fbu3ˋikm4,0P**iijW[YJHLc@$ׅ{Pfx'H&sk~}%`[b!evZRTý.' 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