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135 lines
6.1 KiB
Plaintext
## README for file(1) Command ##
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@(#) $File: README,v 1.49 2015/01/02 20:23:04 christos Exp $
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Mailing List: file@mx.gw.com
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Mailing List archives: http://mx.gw.com/pipermail/file/
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Bug tracker: http://bugs.gw.com/
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E-mail: christos@astron.com
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[](https://travis-ci.org/file/file)
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Phone: Do not even think of telephoning me about this program. Send cash first!
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This is Release 5.x of Ian Darwin's (copyright but distributable)
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file(1) command, an implementation of the Unix File(1) command.
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It knows the 'magic number' of several thousands of file types.
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This version is the standard "file" command for Linux,
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*BSD, and other systems. (See "patchlevel.h" for the exact release number).
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You can download the latest version of the original sources for file from:
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ftp://ftp.astron.com/pub/file/
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A public read-only git repository of the same sources is available at:
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https://github.com/file/file
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The major changes for 5.x are CDF file parsing, indirect magic, name/use
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(recursion) and overhaul in mime and ascii encoding handling.
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The major feature of 4.x is the refactoring of the code into a library,
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and the re-write of the file command in terms of that library. The library
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itself, libmagic can be used by 3rd party programs that wish to identify
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file types without having to fork() and exec() file. The prime contributor
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for 4.0 was Mans Rullgard.
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UNIX is a trademark of UNIX System Laboratories.
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The prime contributor to Release 3.8 was Guy Harris, who put in megachanges
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including byte-order independence.
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The prime contributor to Release 3.0 was Christos Zoulas, who put
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in hundreds of lines of source code changes, including his own
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ANSIfication of the code (I liked my own ANSIfication better, but
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his (__P()) is the "Berkeley standard" way of doing it, and I wanted UCB
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to include the code...), his HP-like "indirection" (a feature of
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the HP file command, I think), and his mods that finally got the
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uncompress (-z) mode finished and working.
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This release has compiled in numerous environments; see PORTING
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for a list and problems.
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This fine freeware file(1) follows the USG (System V) model of the file
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command, rather than the Research (V7) version or the V7-derived 4.[23]
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Berkeley one. That is, the file /etc/magic contains much of the ritual
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information that is the source of this program's power. My version
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knows a little more magic (including tar archives) than System V; the
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/etc/magic parsing seems to be compatible with the (poorly documented)
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System V /etc/magic format (with one exception; see the man page).
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In addition, the /etc/magic file is built from a subdirectory
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for easier(?) maintenance. I will act as a clearinghouse for
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magic numbers assigned to all sorts of data files that
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are in reasonable circulation. Send your magic numbers,
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in magic(5) format please, to the maintainer, Christos Zoulas.
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COPYING - read this first.
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README - read this second (you are currently reading this file).
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INSTALL - read on how to install
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src/apprentice.c - parses /etc/magic to learn magic
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src/asctime_r.c - replacement for OS's that don't have it.
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src/apptype.c - used for OS/2 specific application type magic
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src/asprintf.c - replacement for OS's that don't have it.
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src/ascmagic.c - third & last set of tests, based on hardwired assumptions.
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src/asctime_r.c - replacement for OS's that don't have it.
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src/asprintf.c - replacement for OS's that don't have it.
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src/cdf.[ch] - parser for Microsoft Compound Document Files
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src/cdf_time.c - time converter for CDF.
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src/compress.c - handles decompressing files to look inside.
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src/ctime_r.c - replacement for OS's that don't have it.
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src/elfclass.h - common code for elf 32/64.
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src/encoding.c - handles unicode encodings
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src/file.c - the main program
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src/file.h - header file
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src/file_opts.h - list of options
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src/fmtcheck.c - replacement for OS's that don't have it.
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src/fsmagic.c - first set of tests the program runs, based on filesystem info
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src/funcs.c - utilility functions
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src/getline.c - replacement for OS's that don't have it.
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src/getopt_long.c - replacement for OS's that don't have it.
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src/is_tar.c, tar.h - knows about tarchives (courtesy John Gilmore).
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src/names.h - header file for ascmagic.c
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src/magic.h.in - source file for magic.h
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src/magic.c - the libmagic api
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src/pread.c - replacement for OS's that don't have it.
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src/print.c - print results, errors, warnings.
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src/readcdf.c - CDF wrapper.
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src/readelf.[ch] - Stand-alone elf parsing code.
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src/softmagic.c - 2nd set of tests, based on /etc/magic
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src/mygetopt.h - replacement for OS's that don't have it.
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src/strcasestr.c - replacement for OS's that don't have it.
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src/strlcat.c - replacement for OS's that don't have it.
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src/strlcpy.c - replacement for OS's that don't have it.
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src/tar.h - tar file definitions
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src/vasprintf.c - for systems that don't have it.
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doc/file.man - man page for the command
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doc/magic.man - man page for the magic file, courtesy Guy Harris.
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Install as magic.4 on USG and magic.5 on V7 or Berkeley; cf Makefile.
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Magdir - directory of /etc/magic pieces
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------------------------------------------------------------------------------
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If you submit a new magic entry please make sure you read the following
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guidelines:
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- Initial match is preferably at least 32 bits long, and is a _unique_ match
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- If this is not feasible, use additional check
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- Match of <= 16 bits are not accepted
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- Delay printing string as much as possible, don't print output too early
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- Avoid printf arbitrary byte as string, which can be a source of
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crash and buffer overflow
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- Provide complete information with entry:
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* One line short summary
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* Optional long description
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* File extension, if applicable
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* Full name and contact method (for discussion when entry has problem)
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* Further reference, such as documentation of format
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------------------------------------------------------------------------------
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Parts of this software were developed at SoftQuad Inc., developers
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of SGML/HTML/XML publishing software, in Toronto, Canada.
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SoftQuad was swallowed up by Corel in 2002 and does not exist any longer.
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