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stdlib: base64 stream decoder - #21348

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Decoding part related to #20961.

This proposes stream-friendly interface for base64 decoding (decoding to stream, decoding from read stream to write stream).

While writing this, i realized the original base64 decoder with ignored characters was doing some semi-complicated stuff to keep track of its decoding state. This rewrites the original decoder to rely on the decoder without ignores, moving the track keeping to simply chunking 4 valid characters using streams. This should be equivalent in performances and do not requires memory allocation either.

linusg
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My review doesn't mean much here but stylistic changes LGTM, thanks :)

@Arwalk

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Hello there, i just updated my branch. Is there anyone to review this?

@Arwalk
Arwalkforce-pushed the master branch 2 times, most recently from dcef5f0 to f4fd478CompareNovember 8, 2024 21:37
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Hey there. Is there anything missing for this to be merged? It has been open for a bit of time. I'm not blaming anyone or being mean about it, I'm sure there are much more pressing matters than this, but i'd still like it to be merged at some point :)

@alexrpalexrp added this to the 0.14.0 milestone Jan 30, 2025
@andrewrkandrewrk removed this from the 0.14.0 milestone Mar 1, 2025
@alexrp

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, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
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(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
stdlib: base64 stream decoder by Arwalk · Pull Request #21348 · ziglang/zig · GitHub
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stdlib: base64 stream decoder - #21348
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Decoding part related to #20961.
This proposes stream-friendly interface for base64 decoding (decoding to stream, decoding from read stream to write stream).
While writing this, i realized the original base64 decoder with ignored characters was doing some semi-complicated stuff to keep track of its decoding state. This rewrites the original decoder to rely on the decoder without ignores, moving the track keeping to simply chunking 4 valid characters using streams. This should be equivalent in performances and do not requires memory allocation either.
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My review doesn't mean much here but stylistic changes LGTM, thanks :)
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Hello there, i just updated my branch. Is there anyone to review this?
@Arwalk
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Hey there. Is there anything missing for this to be merged? It has been open for a bit of time. I'm not blaming anyone or being mean about it, I'm sure there are much more pressing matters than this, but i'd still like it to be merged at some point :)
@alexrpalexrp
added this to the 0.14.0 milestone
Jan 30, 2025
@andrewrkandrewrk
removed this from the 0.14.0 milestone
Mar 1, 2025
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
stdlib: base64 stream decoder by Arwalk · Pull Request #21348 · ziglang/zig · GitHub
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stdlib: base64 stream decoder - #21348
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Decoding part related to #20961.
This proposes stream-friendly interface for base64 decoding (decoding to stream, decoding from read stream to write stream).
While writing this, i realized the original base64 decoder with ignored characters was doing some semi-complicated stuff to keep track of its decoding state. This rewrites the original decoder to rely on the decoder without ignores, moving the track keeping to simply chunking 4 valid characters using streams. This should be equivalent in performances and do not requires memory allocation either.
linusg
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Comment threadlib/std/base64.zig
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My review doesn't mean much here but stylistic changes LGTM, thanks :)
@Arwalk
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Hello there, i just updated my branch. Is there anyone to review this?
@Arwalk
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@Arwalk
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Hey there. Is there anything missing for this to be merged? It has been open for a bit of time. I'm not blaming anyone or being mean about it, I'm sure there are much more pressing matters than this, but i'd still like it to be merged at some point :)
@alexrpalexrp
added this to the 0.14.0 milestone
Jan 30, 2025
@andrewrkandrewrk
removed this from the 0.14.0 milestone
Mar 1, 2025
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
stdlib: base64 stream decoder by Arwalk · Pull Request #21348 · ziglang/zig · GitHub
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stdlib: base64 stream decoder - #21348
Closed
Arwalk wants to merge 4 commits into
ziglang:masterfrom 
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Closed
stdlib: base64 stream decoder#21348
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Decoding part related to #20961.
This proposes stream-friendly interface for base64 decoding (decoding to stream, decoding from read stream to write stream).
While writing this, i realized the original base64 decoder with ignored characters was doing some semi-complicated stuff to keep track of its decoding state. This rewrites the original decoder to rely on the decoder without ignores, moving the track keeping to simply chunking 4 valid characters using streams. This should be equivalent in performances and do not requires memory allocation either.
linusg
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View reviewed changes
Comment threadlib/std/base64.zig
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My review doesn't mean much here but stylistic changes LGTM, thanks :)
@Arwalk
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Hello there, i just updated my branch. Is there anyone to review this?
@Arwalk
Arwalkforce-pushed
the
master
branch
2 times, most recently
from
dcef5f0 to
f4fd478CompareNovember 8, 2024 21:37
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Comment threadlib/std/base64.zig
@Arwalk
Arwalk
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Jan 28, 2025

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Hey there. Is there anything missing for this to be merged? It has been open for a bit of time. I'm not blaming anyone or being mean about it, I'm sure there are much more pressing matters than this, but i'd still like it to be merged at some point :)
@alexrpalexrp
added this to the 0.14.0 milestone
Jan 30, 2025
@andrewrkandrewrk
removed this from the 0.14.0 milestone
Mar 1, 2025
@alexrp
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
stdlib: base64 stream decoder by Arwalk · Pull Request #21348 · ziglang/zig · GitHub
Skip to content
stdlib: base64 stream decoder - #21348
Closed
Arwalk wants to merge 4 commits into
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Arwalk:master
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stdlib: base64 stream decoder#21348
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Decoding part related to #20961.
This proposes stream-friendly interface for base64 decoding (decoding to stream, decoding from read stream to write stream).
While writing this, i realized the original base64 decoder with ignored characters was doing some semi-complicated stuff to keep track of its decoding state. This rewrites the original decoder to rely on the decoder without ignores, moving the track keeping to simply chunking 4 valid characters using streams. This should be equivalent in performances and do not requires memory allocation either.
linusg
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Comment threadlib/std/base64.zig
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My review doesn't mean much here but stylistic changes LGTM, thanks :)
@Arwalk
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Hello there, i just updated my branch. Is there anyone to review this?
@Arwalk
Arwalkforce-pushed
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branch
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from
dcef5f0 to
f4fd478CompareNovember 8, 2024 21:37
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Comment threadlib/std/base64.zig
@Arwalk
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Jan 28, 2025

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Hey there. Is there anything missing for this to be merged? It has been open for a bit of time. I'm not blaming anyone or being mean about it, I'm sure there are much more pressing matters than this, but i'd still like it to be merged at some point :)
@alexrpalexrp
added this to the 0.14.0 milestone
Jan 30, 2025
@andrewrkandrewrk
removed this from the 0.14.0 milestone
Mar 1, 2025
@alexrp
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
stdlib: base64 stream decoder by Arwalk · Pull Request #21348 · ziglang/zig · GitHub
Skip to content
stdlib: base64 stream decoder - #21348
Closed
Arwalk wants to merge 4 commits into
ziglang:masterfrom 
Arwalk:master
Closed
stdlib: base64 stream decoder#21348
Arwalk wants to merge 4 commits into
ziglang:masterfrom 
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Decoding part related to #20961.
This proposes stream-friendly interface for base64 decoding (decoding to stream, decoding from read stream to write stream).
While writing this, i realized the original base64 decoder with ignored characters was doing some semi-complicated stuff to keep track of its decoding state. This rewrites the original decoder to rely on the decoder without ignores, moving the track keeping to simply chunking 4 valid characters using streams. This should be equivalent in performances and do not requires memory allocation either.
linusg
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View reviewed changes
Comment threadlib/std/base64.zig
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My review doesn't mean much here but stylistic changes LGTM, thanks :)
@Arwalk
Arwalk
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Hello there, i just updated my branch. Is there anyone to review this?
@Arwalk
Arwalkforce-pushed
the
master
branch
2 times, most recently
from
dcef5f0 to
f4fd478CompareNovember 8, 2024 21:37
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Comment threadlib/std/base64.zig
@Arwalk
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Jan 28, 2025

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Hey there. Is there anything missing for this to be merged? It has been open for a bit of time. I'm not blaming anyone or being mean about it, I'm sure there are much more pressing matters than this, but i'd still like it to be merged at some point :)
@alexrpalexrp
added this to the 0.14.0 milestone
Jan 30, 2025
@andrewrkandrewrk
removed this from the 0.14.0 milestone
Mar 1, 2025
@alexrp
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Jun 15, 2026

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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
stdlib: base64 stream decoder by Arwalk · Pull Request #21348 · ziglang/zig · GitHub
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stdlib: base64 stream decoder - #21348
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stdlib: base64 stream decoder#21348
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Sep 8, 2024

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Decoding part related to #20961.
This proposes stream-friendly interface for base64 decoding (decoding to stream, decoding from read stream to write stream).
While writing this, i realized the original base64 decoder with ignored characters was doing some semi-complicated stuff to keep track of its decoding state. This rewrites the original decoder to rely on the decoder without ignores, moving the track keeping to simply chunking 4 valid characters using streams. This should be equivalent in performances and do not requires memory allocation either.
linusg
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My review doesn't mean much here but stylistic changes LGTM, thanks :)
@Arwalk
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Oct 31, 2024

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Hello there, i just updated my branch. Is there anyone to review this?
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InKryption
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Jan 28, 2025

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Hey there. Is there anything missing for this to be merged? It has been open for a bit of time. I'm not blaming anyone or being mean about it, I'm sure there are much more pressing matters than this, but i'd still like it to be merged at some point :)
@alexrpalexrp
added this to the 0.14.0 milestone
Jan 30, 2025
@andrewrkandrewrk
removed this from the 0.14.0 milestone
Mar 1, 2025
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https://codeberg.org/ziglang/zig/pulls/35784
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
stdlib: base64 stream decoder by Arwalk · Pull Request #21348 · ziglang/zig · GitHub
Skip to content
stdlib: base64 stream decoder - #21348
Closed
Arwalk wants to merge 4 commits into
ziglang:masterfrom 
Arwalk:master
Closed
stdlib: base64 stream decoder#21348
Arwalk wants to merge 4 commits into
ziglang:masterfrom 
Arwalk:master
Conversation
@Arwalk
@ArwalkArwalk
commented
Sep 8, 2024

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Contributor
Decoding part related to #20961.
This proposes stream-friendly interface for base64 decoding (decoding to stream, decoding from read stream to write stream).
While writing this, i realized the original base64 decoder with ignored characters was doing some semi-complicated stuff to keep track of its decoding state. This rewrites the original decoder to rely on the decoder without ignores, moving the track keeping to simply chunking 4 valid characters using streams. This should be equivalent in performances and do not requires memory allocation either.
linusg
linusg
reviewed
Sep 9, 2024
View reviewed changes
Comment threadlib/std/base64.zig
Outdated

@Arwalk
Arwalk
requested a review
from linusgSeptember 9, 2024 22:07
linusg
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My review doesn't mean much here but stylistic changes LGTM, thanks :)
@Arwalk
Arwalk
commented
Oct 31, 2024

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Hello there, i just updated my branch. Is there anyone to review this?
@Arwalk
Arwalkforce-pushed
the
master
branch
2 times, most recently
from
dcef5f0 to
f4fd478CompareNovember 8, 2024 21:37
InKryption
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reviewed
Nov 15, 2024
View reviewed changes
Comment threadlib/std/base64.zig
@Arwalk
Arwalk
commented
Jan 28, 2025

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ContributorAuthor
Hey there. Is there anything missing for this to be merged? It has been open for a bit of time. I'm not blaming anyone or being mean about it, I'm sure there are much more pressing matters than this, but i'd still like it to be merged at some point :)
@alexrpalexrp
added this to the 0.14.0 milestone
Jan 30, 2025
@andrewrkandrewrk
removed this from the 0.14.0 milestone
Mar 1, 2025
@alexrp
alexrp
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Jun 15, 2026

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https://codeberg.org/ziglang/zig/pulls/35784
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closed this
Jun 15, 2026
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