R: Guess the MIME types from filenames

guess_type {mime} | R Documentation

## Guess the MIME types from filenames

### Description

Look up in the `mimemap` table for the MIME types based on the extensions of the given filenames.

### Usage

    guess_type(file, unknown = "application/octet-stream", empty = "text/plain",
        mime_extra = mimeextra, subtype = "")

### Arguments

`file` | a character vector of filenames, or filename extensions
`unknown` | the MIME type to return when the file extension was not found in the table
`empty` | the MIME type for files that do not have extensions
`mime_extra` | a named character vector of the form `c(extension = type)` providing extra MIME types (by default, `mimeextra`); note this MIME table takes precedence over the standard table `mimemap`
`subtype` | a character vector of MIME subtypes, which should be of the same length as `file` if provided (use an empty character string for a file if we do not want a subtype for it)

### Examples

    library(mime)
    # well-known file types
    guess_type(c("a/b/c.html", "d.pdf", "e.odt", "foo.docx", "tex"))
    # not in the standard table, but in mimeextra
    guess_type(c("a.md", "b.R"), mime_extra = NULL)
    guess_type(c("a.md", "b.R"))

    # override the standard MIME table (tex is text/x-tex by default)
    guess_type("tex", mime_extra = c(tex = "text/plain"))
    # unknown extension 'bar'
    guess_type("foo.bar")
    # force unknown types to be plain text
    guess_type("foo.bar", unknown = "text/plain")

    # empty file extension
    guess_type("Makefile")
    # we know it is a plain text file
    guess_type("Makefile", empty = "text/plain")

    # subtypes
    guess_type(c("abc.html", "def.htm"), subtype = c("charset=UTF-8", ""))

[Package mime version 0.5 Index]