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Fix SeekEnd direction and ReadInt24 sign extension#131

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Merged
tdewolff merged 1 commit into from
Sep 1, 2026
+31 −2
Merged

Fix SeekEnd direction and ReadInt24 sign extension #131

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5 changes: 3 additions & 2 deletions binary.go
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -329,7 +329,7 @@ func (r *BinaryReader) Seek(off int64, whence int) (int64, error) {
if off < -r.f.Len() || 0 < off {
return 0, fmt.Errorf("invalid offset")
}
r.pos = r.f.Len() - off
r.pos = r.f.Len() + off
} else {
return 0, fmt.Errorf("invalid whence")
}
Expand DownExpand Up@@ -439,7 +439,8 @@ func (r *BinaryReader) ReadInt16() int16 {

// ReadInt24 reads a int24 into an int32.
func (r *BinaryReader) ReadInt24() int32 {
return int32(r.ReadUint24())
// no int24 to convert through, so sign-extend from bit 23
return int32(r.ReadUint24()<<8) >> 8
}

// ReadInt32 reads a int32.
Expand Down
28 changes: 28 additions & 0 deletions binary_test.go
View file
Open in desktop
Original file line numberDiff line numberDiff line change
@@ -1,6 +1,7 @@
package parse

import (
"io"
"testing"

"github.com/tdewolff/test"
Expand All@@ -23,3 +24,30 @@ func TestBinaryReaderFullRead(t *testing.T) {
test.T(t, NewBinaryReaderBytes([]byte{1, 2, 3, 4}).ReadUint32(), uint32(0x01020304))
test.T(t, NewBinaryReaderBytes([]byte{1, 2, 3, 4, 5, 6, 7, 8}).ReadUint64(), uint64(0x0102030405060708))
}

func TestBinaryReaderSeekEnd(t *testing.T) {
// io.SeekEnd counts back from the end, so a negative offset moves earlier.
buf := []byte{1, 2, 3, 4, 5, 6, 7, 8}
for _, tt := range []struct {
off int64
want int64
}{{0, 8}, {-1, 7}, {-4, 4}, {-8, 0}} {
r := NewBinaryReaderBytes(buf)
pos, err := r.Seek(tt.off, io.SeekEnd)
test.T(t, err, nil)
test.T(t, pos, tt.want)
}

r := NewBinaryReaderBytes(buf)
_, err := r.Seek(-4, io.SeekEnd)
test.T(t, err, nil)
test.T(t, r.ReadUint32(), uint32(0x05060708))
}

func TestBinaryReaderInt24(t *testing.T) {
for _, v := range []int32{-1, -2, -8388608, 0, 1, 8388607} {
w := NewBinaryWriter(nil)
w.WriteInt24(v)
test.T(t, NewBinaryReaderBytes(w.Bytes()).ReadInt24(), v)
}
}
, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
 blocks
(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" + '
Fix SeekEnd direction and ReadInt24 sign extension by youdie006 · Pull Request #131 · tdewolff/parse · GitHub
Skip to content
Fix SeekEnd direction and ReadInt24 sign extension#131

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 Merged

tdewolff
merged 1 commit into

from

Sep 1, 2026

+31

−2

 Merged


Fix SeekEnd direction and ReadInt24 sign extension
#131
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5 changes: 3 additions & 2 deletions
binary.go

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -329,7 +329,7 @@ func (r *BinaryReader) Seek(off int64, whence int) (int64, error) {
 if off < -r.f.Len() || 0 < off {
 return 0, fmt.Errorf("invalid offset")
 }
 r.pos = r.f.Len() - off
 r.pos = r.f.Len() + off
	} else {
 return 0, fmt.Errorf("invalid whence")
	}
Expand DownExpand Up@@ -439,7 +439,8 @@ func (r *BinaryReader) ReadInt16() int16 {

// ReadInt24 reads a int24 into an int32.
func (r *BinaryReader) ReadInt24() int32 {
	return int32(r.ReadUint24())
	// no int24 to convert through, so sign-extend from bit 23
	return int32(r.ReadUint24()<<8) >> 8
}

// ReadInt32 reads a int32.
Expand Down

28 changes: 28 additions & 0 deletions
binary_test.go

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,6 +1,7 @@
package parse

import (
	"io"
	"testing"

	"github.com/tdewolff/test"
Expand All@@ -23,3 +24,30 @@ func TestBinaryReaderFullRead(t *testing.T) {
	test.T(t, NewBinaryReaderBytes([]byte{1, 2, 3, 4}).ReadUint32(), uint32(0x01020304))
	test.T(t, NewBinaryReaderBytes([]byte{1, 2, 3, 4, 5, 6, 7, 8}).ReadUint64(), uint64(0x0102030405060708))
}

func TestBinaryReaderSeekEnd(t *testing.T) {
	// io.SeekEnd counts back from the end, so a negative offset moves earlier.
	buf := []byte{1, 2, 3, 4, 5, 6, 7, 8}
	for _, tt := range []struct {
 off int64
 want int64
	}{{0, 8}, {-1, 7}, {-4, 4}, {-8, 0}} {
 r := NewBinaryReaderBytes(buf)
 pos, err := r.Seek(tt.off, io.SeekEnd)
 test.T(t, err, nil)
 test.T(t, pos, tt.want)
	}

	r := NewBinaryReaderBytes(buf)
	_, err := r.Seek(-4, io.SeekEnd)
	test.T(t, err, nil)
	test.T(t, r.ReadUint32(), uint32(0x05060708))
}

func TestBinaryReaderInt24(t *testing.T) {
	for _, v := range []int32{-1, -2, -8388608, 0, 1, 8388607} {
 w := NewBinaryWriter(nil)
 w.WriteInt24(v)
 test.T(t, NewBinaryReaderBytes(w.Bytes()).ReadInt24(), v)
	}
}

, '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('^' + ".*" + '
Fix SeekEnd direction and ReadInt24 sign extension by youdie006 · Pull Request #131 · tdewolff/parse · GitHub
Skip to content
Fix SeekEnd direction and ReadInt24 sign extension#131

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to your account

 Merged

tdewolff
merged 1 commit into

from

Sep 1, 2026

+31

−2

 Merged


Fix SeekEnd direction and ReadInt24 sign extension
#131
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5 changes: 3 additions & 2 deletions
binary.go

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -329,7 +329,7 @@ func (r *BinaryReader) Seek(off int64, whence int) (int64, error) {
 if off < -r.f.Len() || 0 < off {
 return 0, fmt.Errorf("invalid offset")
 }
 r.pos = r.f.Len() - off
 r.pos = r.f.Len() + off
	} else {
 return 0, fmt.Errorf("invalid whence")
	}
Expand DownExpand Up@@ -439,7 +439,8 @@ func (r *BinaryReader) ReadInt16() int16 {

// ReadInt24 reads a int24 into an int32.
func (r *BinaryReader) ReadInt24() int32 {
	return int32(r.ReadUint24())
	// no int24 to convert through, so sign-extend from bit 23
	return int32(r.ReadUint24()<<8) >> 8
}

// ReadInt32 reads a int32.
Expand Down

28 changes: 28 additions & 0 deletions
binary_test.go

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,6 +1,7 @@
package parse

import (
	"io"
	"testing"

	"github.com/tdewolff/test"
Expand All@@ -23,3 +24,30 @@ func TestBinaryReaderFullRead(t *testing.T) {
	test.T(t, NewBinaryReaderBytes([]byte{1, 2, 3, 4}).ReadUint32(), uint32(0x01020304))
	test.T(t, NewBinaryReaderBytes([]byte{1, 2, 3, 4, 5, 6, 7, 8}).ReadUint64(), uint64(0x0102030405060708))
}

func TestBinaryReaderSeekEnd(t *testing.T) {
	// io.SeekEnd counts back from the end, so a negative offset moves earlier.
	buf := []byte{1, 2, 3, 4, 5, 6, 7, 8}
	for _, tt := range []struct {
 off int64
 want int64
	}{{0, 8}, {-1, 7}, {-4, 4}, {-8, 0}} {
 r := NewBinaryReaderBytes(buf)
 pos, err := r.Seek(tt.off, io.SeekEnd)
 test.T(t, err, nil)
 test.T(t, pos, tt.want)
	}

	r := NewBinaryReaderBytes(buf)
	_, err := r.Seek(-4, io.SeekEnd)
	test.T(t, err, nil)
	test.T(t, r.ReadUint32(), uint32(0x05060708))
}

func TestBinaryReaderInt24(t *testing.T) {
	for _, v := range []int32{-1, -2, -8388608, 0, 1, 8388607} {
 w := NewBinaryWriter(nil)
 w.WriteInt24(v)
 test.T(t, NewBinaryReaderBytes(w.Bytes()).ReadInt24(), v)
	}
}

, '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('^' + ".*" + '
Fix SeekEnd direction and ReadInt24 sign extension by youdie006 · Pull Request #131 · tdewolff/parse · GitHub
Skip to content
Fix SeekEnd direction and ReadInt24 sign extension#131

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to your account

 Merged

tdewolff
merged 1 commit into

from

Sep 1, 2026

+31

−2

 Merged


Fix SeekEnd direction and ReadInt24 sign extension
#131
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5 changes: 3 additions & 2 deletions
binary.go

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -329,7 +329,7 @@ func (r *BinaryReader) Seek(off int64, whence int) (int64, error) {
 if off < -r.f.Len() || 0 < off {
 return 0, fmt.Errorf("invalid offset")
 }
 r.pos = r.f.Len() - off
 r.pos = r.f.Len() + off
	} else {
 return 0, fmt.Errorf("invalid whence")
	}
Expand DownExpand Up@@ -439,7 +439,8 @@ func (r *BinaryReader) ReadInt16() int16 {

// ReadInt24 reads a int24 into an int32.
func (r *BinaryReader) ReadInt24() int32 {
	return int32(r.ReadUint24())
	// no int24 to convert through, so sign-extend from bit 23
	return int32(r.ReadUint24()<<8) >> 8
}

// ReadInt32 reads a int32.
Expand Down

28 changes: 28 additions & 0 deletions
binary_test.go

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,6 +1,7 @@
package parse

import (
	"io"
	"testing"

	"github.com/tdewolff/test"
Expand All@@ -23,3 +24,30 @@ func TestBinaryReaderFullRead(t *testing.T) {
	test.T(t, NewBinaryReaderBytes([]byte{1, 2, 3, 4}).ReadUint32(), uint32(0x01020304))
	test.T(t, NewBinaryReaderBytes([]byte{1, 2, 3, 4, 5, 6, 7, 8}).ReadUint64(), uint64(0x0102030405060708))
}

func TestBinaryReaderSeekEnd(t *testing.T) {
	// io.SeekEnd counts back from the end, so a negative offset moves earlier.
	buf := []byte{1, 2, 3, 4, 5, 6, 7, 8}
	for _, tt := range []struct {
 off int64
 want int64
	}{{0, 8}, {-1, 7}, {-4, 4}, {-8, 0}} {
 r := NewBinaryReaderBytes(buf)
 pos, err := r.Seek(tt.off, io.SeekEnd)
 test.T(t, err, nil)
 test.T(t, pos, tt.want)
	}

	r := NewBinaryReaderBytes(buf)
	_, err := r.Seek(-4, io.SeekEnd)
	test.T(t, err, nil)
	test.T(t, r.ReadUint32(), uint32(0x05060708))
}

func TestBinaryReaderInt24(t *testing.T) {
	for _, v := range []int32{-1, -2, -8388608, 0, 1, 8388607} {
 w := NewBinaryWriter(nil)
 w.WriteInt24(v)
 test.T(t, NewBinaryReaderBytes(w.Bytes()).ReadInt24(), v)
	}
}

, '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" + '
Fix SeekEnd direction and ReadInt24 sign extension by youdie006 · Pull Request #131 · tdewolff/parse · GitHub
Skip to content
Fix SeekEnd direction and ReadInt24 sign extension#131

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Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

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to your account

 Merged

tdewolff
merged 1 commit into

from

Sep 1, 2026

+31

−2

 Merged


Fix SeekEnd direction and ReadInt24 sign extension
#131
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5 changes: 3 additions & 2 deletions
binary.go

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -329,7 +329,7 @@ func (r *BinaryReader) Seek(off int64, whence int) (int64, error) {
 if off < -r.f.Len() || 0 < off {
 return 0, fmt.Errorf("invalid offset")
 }
 r.pos = r.f.Len() - off
 r.pos = r.f.Len() + off
	} else {
 return 0, fmt.Errorf("invalid whence")
	}
Expand DownExpand Up@@ -439,7 +439,8 @@ func (r *BinaryReader) ReadInt16() int16 {

// ReadInt24 reads a int24 into an int32.
func (r *BinaryReader) ReadInt24() int32 {
	return int32(r.ReadUint24())
	// no int24 to convert through, so sign-extend from bit 23
	return int32(r.ReadUint24()<<8) >> 8
}

// ReadInt32 reads a int32.
Expand Down

28 changes: 28 additions & 0 deletions
binary_test.go

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,6 +1,7 @@
package parse

import (
	"io"
	"testing"

	"github.com/tdewolff/test"
Expand All@@ -23,3 +24,30 @@ func TestBinaryReaderFullRead(t *testing.T) {
	test.T(t, NewBinaryReaderBytes([]byte{1, 2, 3, 4}).ReadUint32(), uint32(0x01020304))
	test.T(t, NewBinaryReaderBytes([]byte{1, 2, 3, 4, 5, 6, 7, 8}).ReadUint64(), uint64(0x0102030405060708))
}

func TestBinaryReaderSeekEnd(t *testing.T) {
	// io.SeekEnd counts back from the end, so a negative offset moves earlier.
	buf := []byte{1, 2, 3, 4, 5, 6, 7, 8}
	for _, tt := range []struct {
 off int64
 want int64
	}{{0, 8}, {-1, 7}, {-4, 4}, {-8, 0}} {
 r := NewBinaryReaderBytes(buf)
 pos, err := r.Seek(tt.off, io.SeekEnd)
 test.T(t, err, nil)
 test.T(t, pos, tt.want)
	}

	r := NewBinaryReaderBytes(buf)
	_, err := r.Seek(-4, io.SeekEnd)
	test.T(t, err, nil)
	test.T(t, r.ReadUint32(), uint32(0x05060708))
}

func TestBinaryReaderInt24(t *testing.T) {
	for _, v := range []int32{-1, -2, -8388608, 0, 1, 8388607} {
 w := NewBinaryWriter(nil)
 w.WriteInt24(v)
 test.T(t, NewBinaryReaderBytes(w.Bytes()).ReadInt24(), v)
	}
}

, '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('^' + ".*" + '
Fix SeekEnd direction and ReadInt24 sign extension by youdie006 · Pull Request #131 · tdewolff/parse · GitHub
Skip to content
Fix SeekEnd direction and ReadInt24 sign extension#131

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

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privacy statement. We’ll occasionally send you account related emails.

Already on GitHub?
Sign in
to your account

 Merged

tdewolff
merged 1 commit into

from

Sep 1, 2026

+31

−2

 Merged


Fix SeekEnd direction and ReadInt24 sign extension
#131
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5 changes: 3 additions & 2 deletions
binary.go

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Original file line numberDiff line numberDiff line change
Expand Up@@ -329,7 +329,7 @@ func (r *BinaryReader) Seek(off int64, whence int) (int64, error) {
 if off < -r.f.Len() || 0 < off {
 return 0, fmt.Errorf("invalid offset")
 }
 r.pos = r.f.Len() - off
 r.pos = r.f.Len() + off
	} else {
 return 0, fmt.Errorf("invalid whence")
	}
Expand DownExpand Up@@ -439,7 +439,8 @@ func (r *BinaryReader) ReadInt16() int16 {

// ReadInt24 reads a int24 into an int32.
func (r *BinaryReader) ReadInt24() int32 {
	return int32(r.ReadUint24())
	// no int24 to convert through, so sign-extend from bit 23
	return int32(r.ReadUint24()<<8) >> 8
}

// ReadInt32 reads a int32.
Expand Down

28 changes: 28 additions & 0 deletions
binary_test.go

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Original file line numberDiff line numberDiff line change
@@ -1,6 +1,7 @@
package parse

import (
	"io"
	"testing"

	"github.com/tdewolff/test"
Expand All@@ -23,3 +24,30 @@ func TestBinaryReaderFullRead(t *testing.T) {
	test.T(t, NewBinaryReaderBytes([]byte{1, 2, 3, 4}).ReadUint32(), uint32(0x01020304))
	test.T(t, NewBinaryReaderBytes([]byte{1, 2, 3, 4, 5, 6, 7, 8}).ReadUint64(), uint64(0x0102030405060708))
}

func TestBinaryReaderSeekEnd(t *testing.T) {
	// io.SeekEnd counts back from the end, so a negative offset moves earlier.
	buf := []byte{1, 2, 3, 4, 5, 6, 7, 8}
	for _, tt := range []struct {
 off int64
 want int64
	}{{0, 8}, {-1, 7}, {-4, 4}, {-8, 0}} {
 r := NewBinaryReaderBytes(buf)
 pos, err := r.Seek(tt.off, io.SeekEnd)
 test.T(t, err, nil)
 test.T(t, pos, tt.want)
	}

	r := NewBinaryReaderBytes(buf)
	_, err := r.Seek(-4, io.SeekEnd)
	test.T(t, err, nil)
	test.T(t, r.ReadUint32(), uint32(0x05060708))
}

func TestBinaryReaderInt24(t *testing.T) {
	for _, v := range []int32{-1, -2, -8388608, 0, 1, 8388607} {
 w := NewBinaryWriter(nil)
 w.WriteInt24(v)
 test.T(t, NewBinaryReaderBytes(w.Bytes()).ReadInt24(), v)
	}
}

, '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('^' + ".*" + '
Fix SeekEnd direction and ReadInt24 sign extension by youdie006 · Pull Request #131 · tdewolff/parse · GitHub
Skip to content
Fix SeekEnd direction and ReadInt24 sign extension#131

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 Merged

tdewolff
merged 1 commit into

from

Sep 1, 2026

+31

−2

 Merged


Fix SeekEnd direction and ReadInt24 sign extension
#131
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5 changes: 3 additions & 2 deletions
binary.go

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Original file line numberDiff line numberDiff line change
Expand Up@@ -329,7 +329,7 @@ func (r *BinaryReader) Seek(off int64, whence int) (int64, error) {
 if off < -r.f.Len() || 0 < off {
 return 0, fmt.Errorf("invalid offset")
 }
 r.pos = r.f.Len() - off
 r.pos = r.f.Len() + off
	} else {
 return 0, fmt.Errorf("invalid whence")
	}
Expand DownExpand Up@@ -439,7 +439,8 @@ func (r *BinaryReader) ReadInt16() int16 {

// ReadInt24 reads a int24 into an int32.
func (r *BinaryReader) ReadInt24() int32 {
	return int32(r.ReadUint24())
	// no int24 to convert through, so sign-extend from bit 23
	return int32(r.ReadUint24()<<8) >> 8
}

// ReadInt32 reads a int32.
Expand Down

28 changes: 28 additions & 0 deletions
binary_test.go

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Original file line numberDiff line numberDiff line change
@@ -1,6 +1,7 @@
package parse

import (
	"io"
	"testing"

	"github.com/tdewolff/test"
Expand All@@ -23,3 +24,30 @@ func TestBinaryReaderFullRead(t *testing.T) {
	test.T(t, NewBinaryReaderBytes([]byte{1, 2, 3, 4}).ReadUint32(), uint32(0x01020304))
	test.T(t, NewBinaryReaderBytes([]byte{1, 2, 3, 4, 5, 6, 7, 8}).ReadUint64(), uint64(0x0102030405060708))
}

func TestBinaryReaderSeekEnd(t *testing.T) {
	// io.SeekEnd counts back from the end, so a negative offset moves earlier.
	buf := []byte{1, 2, 3, 4, 5, 6, 7, 8}
	for _, tt := range []struct {
 off int64
 want int64
	}{{0, 8}, {-1, 7}, {-4, 4}, {-8, 0}} {
 r := NewBinaryReaderBytes(buf)
 pos, err := r.Seek(tt.off, io.SeekEnd)
 test.T(t, err, nil)
 test.T(t, pos, tt.want)
	}

	r := NewBinaryReaderBytes(buf)
	_, err := r.Seek(-4, io.SeekEnd)
	test.T(t, err, nil)
	test.T(t, r.ReadUint32(), uint32(0x05060708))
}

func TestBinaryReaderInt24(t *testing.T) {
	for _, v := range []int32{-1, -2, -8388608, 0, 1, 8388607} {
 w := NewBinaryWriter(nil)
 w.WriteInt24(v)
 test.T(t, NewBinaryReaderBytes(w.Bytes()).ReadInt24(), v)
	}
}

, '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); }
})();
})();
Fix SeekEnd direction and ReadInt24 sign extension by youdie006 · Pull Request #131 · tdewolff/parse · GitHub
Skip to content
Fix SeekEnd direction and ReadInt24 sign extension#131

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

 Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and
privacy statement. We’ll occasionally send you account related emails.

Already on GitHub?
Sign in
to your account

 Merged

tdewolff
merged 1 commit into

from

Sep 1, 2026

+31

−2

 Merged


Fix SeekEnd direction and ReadInt24 sign extension
#131
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5 changes: 3 additions & 2 deletions
binary.go

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -329,7 +329,7 @@ func (r *BinaryReader) Seek(off int64, whence int) (int64, error) {
 if off < -r.f.Len() || 0 < off {
 return 0, fmt.Errorf("invalid offset")
 }
 r.pos = r.f.Len() - off
 r.pos = r.f.Len() + off
	} else {
 return 0, fmt.Errorf("invalid whence")
	}
Expand DownExpand Up@@ -439,7 +439,8 @@ func (r *BinaryReader) ReadInt16() int16 {

// ReadInt24 reads a int24 into an int32.
func (r *BinaryReader) ReadInt24() int32 {
	return int32(r.ReadUint24())
	// no int24 to convert through, so sign-extend from bit 23
	return int32(r.ReadUint24()<<8) >> 8
}

// ReadInt32 reads a int32.
Expand Down

28 changes: 28 additions & 0 deletions
binary_test.go

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,6 +1,7 @@
package parse

import (
	"io"
	"testing"

	"github.com/tdewolff/test"
Expand All@@ -23,3 +24,30 @@ func TestBinaryReaderFullRead(t *testing.T) {
	test.T(t, NewBinaryReaderBytes([]byte{1, 2, 3, 4}).ReadUint32(), uint32(0x01020304))
	test.T(t, NewBinaryReaderBytes([]byte{1, 2, 3, 4, 5, 6, 7, 8}).ReadUint64(), uint64(0x0102030405060708))
}

func TestBinaryReaderSeekEnd(t *testing.T) {
	// io.SeekEnd counts back from the end, so a negative offset moves earlier.
	buf := []byte{1, 2, 3, 4, 5, 6, 7, 8}
	for _, tt := range []struct {
 off int64
 want int64
	}{{0, 8}, {-1, 7}, {-4, 4}, {-8, 0}} {
 r := NewBinaryReaderBytes(buf)
 pos, err := r.Seek(tt.off, io.SeekEnd)
 test.T(t, err, nil)
 test.T(t, pos, tt.want)
	}

	r := NewBinaryReaderBytes(buf)
	_, err := r.Seek(-4, io.SeekEnd)
	test.T(t, err, nil)
	test.T(t, r.ReadUint32(), uint32(0x05060708))
}

func TestBinaryReaderInt24(t *testing.T) {
	for _, v := range []int32{-1, -2, -8388608, 0, 1, 8388607} {
 w := NewBinaryWriter(nil)
 w.WriteInt24(v)
 test.T(t, NewBinaryReaderBytes(w.Bytes()).ReadInt24(), v)
	}
}