Magic

magic (libmagic.a) is a static library that identifies the MIME type of a file,
or
of a buffer in memory, by inspecting the content. This archive contains static
libraries and the public header for AmigaOS 3 (68k), AmigaOS 4 (PPC) and
MorphOS (PPC) development, plus the magic database the library needs at run
time.

Contents

    magic.readme                       this file
    magic/C/magic.mgc                  the compiled magic database (shared by
                                       all systems -- it is not machine code)

    magic/AmigaOS3/libnix/             header and libraries, libnix
    magic/AmigaOS3/clib2/              header and libraries, clib2
    magic/AmigaOS4/                    header and libraries, clib4
    magic/MorphOS/                     header and libraries, both ABIs

    Each of those directories holds include/magic.h plus a lib/ tree in the
    gcc multilib layout, so it can be copied straight over an existing SDK.

    Note the difference between the two architectures. On m68k each C runtime
    is a separate tree, so libnix/ and clib2/ each carry their own include/
    and lib/. On PPC the runtime is instead a multilib slot beneath a shared
    lib/, and headers come from the one shared include/.

    AmigaOS 3 slots (inside libnix/ and clib2/):

        lib/                   68000, absolute addressing
        lib/libm020/           68020, absolute addressing
        lib/libb/              68000, -fbaserel
        lib/libb/libm020/      68020, -fbaserel
        lib/libb32/libm020/    68020, -fbaserel32

    AmigaOS 4 slots:

        lib/clib4/             clib4

    MorphOS slots:

        lib/                   ixemul
        lib/libb32/            ixemul, -mbaserel32
        lib/libnix/            native C library (-noixemul)
        lib/libb32/libnix/     native C library, -mbaserel32

        -mclib=libnix and -noixemul select the same multilib. That ABI is the
        self-contained one -- an ixemul build needs ixemul.library on the
        target machine -- so prefer lib/libnix/ for new code.


Installation

    Copy the tree for your target into the matching cross compiler
    directory, e.g.

        cp -a magic/AmigaOS3/libnix /opt/amiga/m68k-amigaos/
        cp -a magic/AmigaOS3/clib2  /opt/amiga/m68k-amigaos/
        cp -a magic/AmigaOS4/*      /opt/amiga/ppc-amigaos/
        cp -a magic/MorphOS/*       /opt/amiga/ppc-morphos/

    Then copy C/magic.mgc to C: on the target machine, or ship it with your
    application. Point the library at it with magic_load().


Usage

    #include <magic.h>

    magic_t m = magic_open(MAGIC_MIME_TYPE);
    magic_load(m, NULL);                  /* or "C:magic.mgc" */
    const char *type = magic_file(m, "Work:something");
    magic_close(m);

    Link with -lmagic -lm, and put them *after* your own objects on the
    command line. For clib2 add -lunix after -lmagic, since clib2 keeps its
    POSIX layer there.


Licence

    BSD-style; see COPYING in the source distribution.