// meta-data blobs/sections (one per instrumented package), and an offsets
// area storing the offsets of each section. Format of the meta-data
// file looks like:
//
// --header----------
//  | magic: [4]byte magic string
//  | version
//  | total length of meta-data file in bytes
//  | numPkgs: number of package entries in file
//  | hash: [16]byte hash of entire meta-data payload
//  | offset to string table section

	}
	defer closefd(fd)

	buf := make([]byte, headersize)
	if err := preadn(fd, buf, 0); err != nil {
		return nil, errors.New("corrupt tzdata file " + file)
	}
	d := dataIO{buf, false}
	if magic := d.read(6); string(magic) != "tzdata" {
		return nil, errors.New("corrupt tzdata file " + file)
	}
	d = dataIO{buf[12:], false}
	indexOff, _ := d.big4()
	dataOff, _ := d.big4()
	indexSize := dataOff - indexOff

retry:
	relativeOffset := 0

	// Read magic number. RFC 3.1.1.
	if _, err := io.ReadFull(r.r, r.scratch[:4]); err != nil {
		// We require that the stream contains at least one frame.
		if err == io.EOF && !r.readOneFrame {
			err = io.ErrUnexpectedEOF
		}
		return r.wrapError(relativeOffset, err)
	}

	if magic := binary.LittleEndian.Uint32(r.scratch[:4]); magic != 0xfd2fb528 {

	NumberOfSymbols      uint32
	SizeOfOptionalHeader uint16
	Characteristics      uint16
}

type DataDirectory struct {
	VirtualAddress uint32
	Size           uint32
}

type OptionalHeader32 struct {
	Magic                       uint16
	MajorLinkerVersion          uint8
	MinorLinkerVersion          uint8
	SizeOfCode                  uint32
	SizeOfInitializedData       uint32
	SizeOfUninitializedData     uint32

	}

	// For server first protocol, we expect the server to send us the magic string first
	if cfg.Request.ServerFirst {
		readBytes, err := bufio.NewReader(conn).ReadBytes('\n')
		if err != nil {
			fwLog.Warnf("server first TCP read failed: %v", err)
			return "", err
		}
		if string(readBytes) != common.ServerFirstMagicString {
			return "", fmt.Errorf("did not receive magic string. Want %q, got %q", common.ServerFirstMagicString, string(readBytes))

const bzip2FinalMagic = 0x177245385090

// setup parses the bzip2 header.
func (bz2 *reader) setup(needMagic bool) error {
	br := &bz2.br

	if needMagic {
		magic := br.ReadBits(16)
		if magic != bzip2FileMagic {
			return StructuralError("bad magic value")
		}
	}

	t := br.ReadBits(8)
	if t != 'h' {
		return StructuralError("non-Huffman entropy encoding")
	}

	level := br.ReadBits(8)

	}
}

// writePlan9Header writes out the plan9 header at the present position in the OutBuf.
func writePlan9Header(buf *OutBuf, magic uint32, entry int64, is64Bit bool) {
	if is64Bit {
		magic |= 0x00008000
	}
	buf.Write32b(magic)
	buf.Write32b(uint32(Segtext.Filelen))
	buf.Write32b(uint32(Segdata.Filelen))
	buf.Write32b(uint32(Segdata.Length - Segdata.Filelen))
	buf.Write32b(uint32(symSize))

def magic_data_reader(raw_body: bytes):
    return {
        "size": len(raw_body),
        "content": {
            "name": "Maaaagic",
            "price": 42,
            "description": "Just kiddin', no magic here. ✨",
        },
    }


@app.post(
    "/items/",
    openapi_extra={
        "requestBody": {
            "content": {
                "application/json": {
                    "schema": {

	// _cgo_import.go file, thus smuggling a magic //go:cgo_ldflag
	// pragma into a Go file. We used to not check the pragmas in
	// _cgo_import.go.

	rewrite := func(from, to string) {
		obj, err := os.ReadFile(from)
		if err != nil {
			t.Fatal(err)
		}

		if bytes.Count(obj, []byte(magicInput)) == 0 {
			t.Fatalf("%s: did not find magic string", from)
		}

func (h *Header) Read(r *Reader) error {
	b := r.BytesAt(0, len(Magic))
	h.Magic = string(b)
	if h.Magic != Magic {
		return errors.New("wrong magic, not a Go object file")
	}
	off := uint32(len(h.Magic))
	copy(h.Fingerprint[:], r.BytesAt(off, len(h.Fingerprint)))
	off += 8
	h.Flags = r.uint32At(off)
	off += 4
	for i := range h.Offsets {
		h.Offsets[i] = r.uint32At(off)
		off += 4
	}
	return nil
}