Commit Graph

13 Commits

Author SHA1 Message Date
Josselin Costanzi 244c98fe01 encoding/base64: optimize DecodeString
Optimize base64 decoding speed by adding 32-bits and 64-bits specialized
methods that don't perform any error checking and fall back to the more
complex decodeQuantum method when a non-base64 character is present.

On a 64-bits cpu:

name                 old time/op    new time/op     delta
DecodeString/2-4       70.0ns ± 6%     69.2ns ± 0%     ~     (p=0.169 n=5+8)
DecodeString/4-4       91.3ns ± 2%     80.4ns ± 0%  -11.89%  (p=0.001 n=5+10)
DecodeString/8-4        126ns ± 5%      106ns ± 0%  -16.14%  (p=0.000 n=5+7)
DecodeString/64-4       652ns ±21%      361ns ± 0%  -44.57%  (p=0.000 n=5+7)
DecodeString/8192-4    61.0µs ±13%     31.5µs ± 1%  -48.38%  (p=0.001 n=5+9)

name                 old speed      new speed       delta
DecodeString/2-4     57.2MB/s ± 6%   57.7MB/s ± 2%     ~     (p=0.419 n=5+9)
DecodeString/4-4     87.7MB/s ± 2%   99.5MB/s ± 0%  +13.45%  (p=0.001 n=5+10)
DecodeString/8-4     94.8MB/s ± 5%  112.6MB/s ± 1%  +18.82%  (p=0.001 n=5+9)
DecodeString/64-4     136MB/s ±19%    243MB/s ± 0%  +78.17%  (p=0.003 n=5+7)
DecodeString/8192-4   180MB/s ±11%    347MB/s ± 1%  +92.94%  (p=0.001 n=5+9)

Improves #19636

Change-Id: Ic10a454851093a7e1d46ca0c140deed73535d990
Reviewed-on: https://go-review.googlesource.com/38632
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2017-10-09 15:39:51 +00:00
Josselin Costanzi 31c96fc227 encoding/base64: Optimize DecodeString
Optimize DecodeString for the common case where most of the input isn't
a newline or a padding character.
Also add some testcases found when fuzzing this implementation against
upstream.
Change Decode benchmark to run with different input sizes.

name                 old time/op    new time/op    delta
DecodeString/2-4       71.5ns ± 4%    70.0ns ± 6%     ~     (p=0.246 n=5+5)
DecodeString/4-4        112ns ±25%      91ns ± 2%     ~     (p=0.056 n=5+5)
DecodeString/8-4        136ns ± 5%     126ns ± 5%   -7.33%  (p=0.016 n=5+5)
DecodeString/64-4       872ns ±29%     652ns ±21%  -25.23%  (p=0.032 n=5+5)
DecodeString/8192-4    90.9µs ±21%    61.0µs ±13%  -32.87%  (p=0.008 n=5+5)

name                 old speed      new speed      delta
DecodeString/2-4     56.0MB/s ± 4%  57.2MB/s ± 6%     ~     (p=0.310 n=5+5)
DecodeString/4-4     73.4MB/s ±23%  87.7MB/s ± 2%     ~     (p=0.056 n=5+5)
DecodeString/8-4     87.8MB/s ± 5%  94.8MB/s ± 5%   +7.98%  (p=0.016 n=5+5)
DecodeString/64-4     103MB/s ±24%   136MB/s ±19%  +32.63%  (p=0.032 n=5+5)
DecodeString/8192-4   122MB/s ±19%   180MB/s ±11%  +47.75%  (p=0.008 n=5+5)

Improves #19636

Change-Id: I39667f4fb682a12b3137946d017ad999553c5780
Reviewed-on: https://go-review.googlesource.com/34950
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2017-04-24 22:40:23 +00:00
Kevin Burke c5cdda401e encoding/base64, html/template: fix grammar mistakes
Replace 'does not contains' with 'does not contain' where it appears
in the source code.

Change-Id: Ie7266347c429512c8a41a7e19142afca7ead3922
Reviewed-on: https://go-review.googlesource.com/37887
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2017-03-07 17:42:45 +00:00
Josselin Costanzi 9207a7437e encoding/base64: add alphabet and padding restrictions
Document and check that the alphabet cannot contain '\n' or '\r'.
Document that the alphabet cannot contain the padding character.
Document that the padding character must be equal or bellow '\xff'.
Document that the padding character must not be '\n' or '\r'.

Fixes #19343
Fixes #19318

Change-Id: I6de0034d347ffdf317d7ea55d6fe38b01c2c4c03
Reviewed-on: https://go-review.googlesource.com/37838
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2017-03-07 02:53:23 +00:00
Josselin Costanzi 5ce06cf71d encoding/base64: fix decode reports incorrect index
Fix Decode to return the correct illegal data index from a corrupted
input that contains whitespaces.

Fixes #19406

Change-Id: Ib2b2b6ed7e41f024d0da2bd035caec4317c2869c
Reviewed-on: https://go-review.googlesource.com/37837
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2017-03-06 19:28:03 +00:00
Xuyang Kang 87b1aaa37c encoding/base64: This change modifies Go to take strict option when decoding base64
If strict option is enabled, when decoding, instead of skip the padding
bits, it will do strict check to enforce they are set to zero.

Fixes #15656

Change-Id: I869fb725a39cc9dde44dbc4ff0046446e7abc642
Reviewed-on: https://go-review.googlesource.com/24964
Reviewed-by: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2016-10-12 03:56:18 +00:00
Caleb Spare 87151c82b6 encoding/base64: correct DecodedLen overestimate for unpadded encodings
While we're at it, add tests for EncodedLen and DecodedLen.

Fixes #14803.

Change-Id: I200c72cf11c51669b8d9f70c6e57ece359f7ae61
Reviewed-on: https://go-review.googlesource.com/20649
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2016-03-15 20:43:04 +00:00
Brad Fitzpatrick 5fea2ccc77 all: single space after period.
The tree's pretty inconsistent about single space vs double space
after a period in documentation. Make it consistently a single space,
per earlier decisions. This means contributors won't be confused by
misleading precedence.

This CL doesn't use go/doc to parse. It only addresses // comments.
It was generated with:

$ perl -i -npe 's,^(\s*// .+[a-z]\.)  +([A-Z]),$1 $2,' $(git grep -l -E '^\s*//(.+\.)  +([A-Z])')
$ go test go/doc -update

Change-Id: Iccdb99c37c797ef1f804a94b22ba5ee4b500c4f7
Reviewed-on: https://go-review.googlesource.com/20022
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Dave Day <djd@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2016-03-02 00:13:47 +00:00
Russ Cox 20d745c57c encoding/base64: fix streaming decode of padding-free base64
Fixes #13384.

Change-Id: Id9e827acddc8de139f93c5de0c6486bc4334c7d4
Reviewed-on: https://go-review.googlesource.com/18330
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2016-01-08 15:07:45 +00:00
Brad Fitzpatrick 7fb7f53232 encoding/base64: fix copy-paste-o bug in RawURLEncoding docs
Fixes #12244

Change-Id: Iee4e45d9bca0718c71fcc574bc51b2084c3dcb2a
Reviewed-on: https://go-review.googlesource.com/13783
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
2015-08-21 02:42:11 +00:00
Egon Elbre b075d1fc2e encoding/base64: Optimize EncodeToString and DecodeString.
benchmark                   old ns/op     new ns/op     delta
BenchmarkEncodeToString     31281         23821         -23.85%
BenchmarkDecodeString       156508        82254         -47.44%

benchmark                   old MB/s     new MB/s     speedup
BenchmarkEncodeToString     261.88       343.89       1.31x
BenchmarkDecodeString       69.80        132.81       1.90x

Change-Id: I115e0b18c3a6d5ef6bfdcb3f637644f02f290907
Reviewed-on: https://go-review.googlesource.com/8808
Reviewed-by: Nigel Tao <nigeltao@golang.org>
2015-04-24 01:45:43 +00:00
Bryan Ford 2e0a1a7573 encoding/base64: add unpadded encodings, and test all encodings.
Some applications use unpadded base64 format, omitting the trailing
'=' padding characters from the standard base64 format, either to
minimize size or (more justifiably) to avoid use of the '=' character.
Unpadded flavors are standard and documented in section 3.2 of RFC 4648.

To support these unpadded flavors, this change adds two predefined
encoding variables, RawStdEncoding and RawURLEncoding, for unpadded
encodings using the standard and URL character set, respectively.
The change also adds a function WithPadding() to customize the padding
character or disable padding in a custom Encoding.

Finally, I noticed that the existing base64 test-suite was only
exercising the StdEncoding, and not referencing URLEncoding at all.
This change adds test-suite functionality to exercise all four encodings
(the two existing ones and the two new unpadded flavors),
although it still doesn't run *every* test on all four encodings.

Naming: I used the "Raw" prefix because it's more concise than "Unpadded"
and seemed just as expressive, but I have no strong preferences here.
Another short alternative prefix would be "Min" ("minimal" encoding).

Change-Id: Ic0423e02589b39a6b2bb7d0763bd073fd244f469
Reviewed-on: https://go-review.googlesource.com/1511
Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-by: Minux Ma <minux@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2014-12-22 16:05:23 +00:00
Russ Cox c007ce824d build: move package sources from src/pkg to src
Preparation was in CL 134570043.
This CL contains only the effect of 'hg mv src/pkg/* src'.
For more about the move, see golang.org/s/go14nopkg.
2014-09-08 00:08:51 -04:00