Validate UTF-8

Checks that bytes are well-formed UTF-8: no overlong forms, no surrogates (U+D800 to U+DFFF), nothing above U+10FFFF. The result agrees with validUTF8(); the declared encoding of a string is ignored, only its bytes are examined.

Usage

fast_utf8_valid(x)

Arguments

x

A character vector, or a raw vector holding one byte sequence.

Value

For a character vector, a logical vector of the same length, NA where x is NA. For a raw vector, a single TRUE or FALSE.

Examples

fast_utf8_valid(c("plain", rawToChar(as.raw(c(0x63, 0x61, 0x66, 0xc3, 0xa9))), NA))
#> [1] TRUE TRUE   NA
fast_utf8_valid(as.raw(c(0xc3, 0x28)))   # invalid continuation byte
#> [1] FALSE