Infer the MIME type from a file name
This function returns the MIME type, i.e. part of the value used in the Content-Type for an HTTP request/response or in email to identify the nature of the content. This is a string such as "text/plain" or "text/xml" or "image/png".
The function consults an R object constructed by reading a Web site of known MIME types (not necessarily all) and matching the extension of the file name to the names of that table.
guessMIMEType(name, default = NA)
name |
character vector of file names |
default |
the value to use if no MIME type is found in the table for the given file name/extension. |
A character vector giving the MIME types for each element of name.
Duncan Temple Lang
The table of MIME types and extensions was programmatically extracted
from http://www.webmaster-toolkit.com/mime-types.shtml or
http://reference.sitepoint.com/html/mime-types-full with
tbls = readHTMLTable("http://www.webmaster-toolkit.com/mime-types.shtml")
tmp = tbls[[1]][-1,]
mimeTypeExtensions = structure(as.character(tmp[[2]]), names = gsub("^\.", "", tmp[[1]]))
save(mimeTypeExtensions, file = "data/mimeTypeExtensions.rda")
The IANA list is not as convenient to programmatically compile.
Uploading file.
guessMIMEType(c("foo.txt", "foo.png", "foo.jpeg", "foo.Z", "foo.R"))
guessMIMEType("foo.bob")
guessMIMEType("foo.bob", "application/x-binary")Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.