magicFileReader

auto data =
    "MIME-Magic\0\n[60:text/x-diff]\n" ~
    ">0=__NOMAGIC__\n" ~
    "0>4=\x00\x02\x55\x40&\xff\xf0~2+8\n" ~
        "1>12=\x00\x04\x55\x40\xff\xf0~4+10\n";

void sink(MagicEntry t) {
    assert(t.mimeType == "text/x-diff");
    assert(t.magic.weight == 60);
    assert(t.magic.matches.length == 1);
    assert(t.deleteMagic);

    auto match = t.magic.matches[0];
    assert(match.startOffset == 4);
    assert(match.value.length == 2);
    assert(match.mask.length == 2);
    assert(match.type == MagicMatch.Type.host16);
    assert(match.rangeLength == 8);
    assert(match.submatches.length == 1);

    auto submatch = match.submatches[0];
    assert(submatch.startOffset == 12);
    assert(submatch.value.length == 4);
    assert(!submatch.hasMask());
    assert(submatch.type == MagicMatch.Type.host32);
    assert(submatch.rangeLength == 10);
}
magicFileReader(data, &sink);

void emptySink(MagicEntry t) {

}
assertThrown!MimeMagicFileException(magicFileReader("MIME-wrong-magic", &emptySink));