A continuation byte in UTF-8 is any byte where the top two bits are 10. They are the subsequent bytes in multi-byte sequences. The following table may help: Unicode code points Encoding Binary value ——————- ——– ———— U+000000-U+00007f 0xxxxxxx 0xxxxxxx U+000080-U+0007ff 110yyyxx 00000yyy xxxxxxxx 10xxxxxx U+000800-U+00ffff 1110yyyy yyyyyyyy xxxxxxxx 10yyyyxx 10xxxxxx U+010000-U+10ffff 11110zzz 000zzzzz yyyyyyyy … Read more
You can use the libraries described in Text normalization in Go. Here’s an application of those libraries: // Example derived from: http://blog.golang.org/normalization package main import ( “fmt” “unicode” “golang.org/x/text/transform” “golang.org/x/text/unicode/norm” ) func isMn(r rune) bool { return unicode.Is(unicode.Mn, r) // Mn: nonspacing marks } func main() { t := transform.Chain(norm.NFD, transform.RemoveFunc(isMn), norm.NFC) result, _, _ … Read more
No. The color is inherent to the character — there’s a LARGE BLUE CIRCLE as well (U+1F535 – 🔵), but no other colors are currently defined by the Unicode standard.
Unicode has two symbols for unknown characters: □ (WHITE SQUARE, U+25A1) – Replaces a missing or unsupported Unicode character. � (REPLACEMENT CHARACTER, U+FFFD) – Replaces an invalid or unrecognizable character. Indicates a Unicode error. Sources Quora – What symbol is the square box shown for non-representable Unicode characters? FileFormat.Info – Unicode Character ‘WHITE SQUARE’ (U+25A1) … Read more
— is wrong. When you use numeric character references, the number refers to the Unicode codepoint. For numbers below 256 that is the same as the codepoint in ISO-8859-1. In 8859-1, character 151 is amongst the “C1 control codes”, and not a dash or any other visible character. The confusion arises because character 151 is … Read more
Some of the most similar chars I’ve found so far: ∀, ∨, ∇, ▼, Y, Ⴤ, V, ᗊ, ⑂, ツ
From the Unicode Spec: http://unicode.org/charts/PDF/U25A0.pdf U+25A1 □ WHITE SQUARE may be used to represent a missing ideograph → U+20DE $⃞ combining enclosing square
First let’s look at definitions D9, D10 and D10a, Section 3.4, Characters and Encoding: D9 Unicode codespace: A range of integers from 0 to 10FFFF16. D10 Code point: Any value in the Unicode codespace. • A code point is also known as a code position. … D10a Code point type: Any of the seven fundamental … Read more
Computers are generally much better at dealing with data on 4 byte boundaries. The benefits in terms of reduced memory consumption are relatively small compared with the pain of working on 3-byte boundaries. (I speculate there was also a reluctance to have a limit that was “only what we can currently imagine being useful” when … Read more
We’ve talked about attacks using the RLO (U+202E RIGHT TO LEFT OVERRIDE) character in the past, which shifts the ‘visual’ display of a string from the position it’s placed inside that string. So for example: document[U+202E]fdp.exe visually looks like documentexe.pdf I talked about these and other attacks of this sort here http://www.casaba.com/products/UCAPI/. In fact we’re … Read more