Base64 Decode

Decodes a character string, raw vector or other object from base64 encoding.

Usage

base64dec(x, convert = TRUE, url = FALSE)

Arguments

x

an object.

convert

logical TRUE to convert back to a character string, FALSE to convert back to a raw vector or NA to decode and then unserialize back to the original object.

url

logical TRUE to use the URL- and filename-safe base64url alphabet without padding, or FALSE (the default) for standard base64.

Value

A character string, raw vector, or other object depending on the value of convert.

Details

The value of convert should be set to TRUE, FALSE or NA to be the reverse of the 3 encoding operations (for strings, raw vectors and arbitrary objects), in order to return the original object.

Set url = TRUE to decode the URL- and filename-safe variant (RFC 4648 section 5), which expects the - and _ alphabet without padding; inputs containing +, / or = are then rejected. The value of url must match the variant used to encode.

References

This implementation is based that by 'The Mbed TLS Contributors' under the 'Mbed TLS' Trusted Firmware Project at https://www.trustedfirmware.org/projects/mbed-tls.

See also

base64enc()

Examples

base64dec(base64enc("secret base"))
#> [1] "secret base"
base64dec(base64enc(as.raw(c(1L, 2L, 4L))), convert = FALSE)
#> [1] 01 02 04
base64dec(base64enc(data.frame()), convert = NA)
#> data frame with 0 columns and 0 rows
base64dec(base64enc("secret base", url = TRUE), url = TRUE)
#> [1] "secret base"