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These functions operate on the magic database file
which is described in The function creates a magic cookie pointer and
returns it. It returns NULL if there was an error allocating the magic cookie.
The argument specifies how the other magic functions should behave:
No special handling. Print debugging messages to stderr. If the file queried
is a symlink, follow it. If the file is compressed, unpack it and look
at the contents. If the file is a block or character special device, then
open the device and try to look in its contents. Return a MIME type string,
instead of a textual description. Return a MIME encoding, instead of a
textual description. Return all matches, not just the first. Check the
magic database for consistency and print warnings to stderr. On systems
that support or attempt to preserve the access time of files analyzed.
Don’t translate unprintable characters to a \ooo octal representation. Treat
operating system errors while trying to open files and follow symlinks
as real errors, instead of printing them in the magic buffer. Check for
application type (only on EMX). Check for various types of ascii files.
Don’t look for, or inside compressed files. Don’t print elf details. Don’t
look for fortran sequences inside ascii files. Don’t consult magic files.
Don’t examine tar files. Don’t look for known tokens inside ascii files.
Don’t look for troff sequences inside ascii files. The function closes
the database and deallocates any resources used. The function returns
a textual explanation of the last error, or NULL if there was no error.
The function returns the last operating system error number that was
encountered by a system call. The function returns a textual description
of the contents of the argument, or NULL if an error occurred. If the
is NULL, then stdin is used. The function returns a textual description
of the contents of the argument with bytes size. The function sets the
described above. Note that using both MIME flags together can also return
extra information on the charset. The function can be used to check the
validity of entries in the colon separated database files passed in as
or NULL for the default database. It returns 0 on success and -1 on failure.
The function can be used to compile the the colon separated list of database
files passed in as or NULL for the default database. It returns 0 on success
and -1 on failure. The compiled files created are named from the of each
file argument with appended to it. The function must be used to load
the the colon separated list of database files passed in as or NULL for
the default database file before any magic queries can performed. The default
database file is named by the MAGIC environment variable. If that variable
is not set, the default database file name is c:/progra~1/file/share/misc/magic.
adds to the database filename as appropriate.
The function
returns a magic cookie on success and NULL on failure setting errno to
an appropriate value. It will set errno to EINVAL if an unsupported value
for flags was given. The and functions return 0 on success and -1 on failure.
The and functions return a string on success and NULL on failure. The
function returns a textual description of the errors of the above functions,
or NULL if there was no error. Finally, returns -1 on systems that don’t
support or when is set.
The non-compiled default magic database.
The compiled default magic database.
Måns Rullgård Initial
libmagic implementation, and configuration. Christos Zoulas API cleanup,
error code and allocation handling.
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