// license that can be found in the LICENSE file.

package multipart

import (
	"net/textproto"
	_ "unsafe" // for go:linkname
)

// readMIMEHeader is defined in package [net/textproto].
//
//go:linkname readMIMEHeader net/textproto.readMIMEHeader

	m, err := r.ReadMIMEHeader()
	want := MIMEHeader{
		"My-Key":   {"Value 1", "Value 2"},
		"Long-Key": {"Even Longer Value"},
	}
	if !reflect.DeepEqual(m, want) || err != nil {
		t.Fatalf("ReadMIMEHeader: %v, %v; want %v", m, err, want)
	}
}

func TestReadMIMEHeaderSingle(t *testing.T) {
	r := reader("Foo: bar\n\n")
	m, err := r.ReadMIMEHeader()
	want := MIMEHeader{"Foo": {"bar"}}

//	My-Key: Value 2
//
// Given that input, ReadMIMEHeader returns the map:
//
//	map[string][]string{
//		"My-Key": {"Value 1", "Value 2"},
//		"Long-Key": {"Even Longer Value"},
//	}
func (r *Reader) ReadMIMEHeader() (MIMEHeader, error) {
	return readMIMEHeader(r, math.MaxInt64, math.MaxInt64)
}

// readMIMEHeader is accessed from mime/multipart.
//go:linkname readMIMEHeader

	}
	if resp.ProtoMajor, resp.ProtoMinor, ok = ParseHTTPVersion(resp.Proto); !ok {
		return nil, badStringError("malformed HTTP version", resp.Proto)
	}

	// Parse the response headers.
	mimeHeader, err := tp.ReadMIMEHeader()
	if err != nil {
		if err == io.EOF {
			err = io.ErrUnexpectedEOF
		}
		return nil, err
	}
	resp.Header = Header(mimeHeader)

	fixPragmaCacheControl(resp.Header)

		}
	}
	return bp, nil
}

func (p *Part) populateHeaders(maxMIMEHeaderSize, maxMIMEHeaders int64) error {
	r := textproto.NewReader(p.mr.bufReader)
	header, err := readMIMEHeader(r, maxMIMEHeaderSize, maxMIMEHeaders)
	if err == nil {
		p.Header = header
	}
	// TODO: Add a distinguishable error to net/textproto.
	if err != nil && err.Error() == "message too large" {

		return nil, err
	}

	return &Message{
		Header: Header(hdr),
		Body:   tp.R,
	}, nil
}

// readHeader reads the message headers from r.
// This is like textproto.ReadMIMEHeader, but doesn't validate.
// The fix for issue #53188 tightened up net/textproto to enforce
// restrictions of RFC 7230.
// This package implements RFC 5322, which does not have those restrictions.

	if !seeUpcomingDoubleCRLF(b.r) {
		return errors.New("http: suspiciously long trailer after chunked body")
	}

	hdr, err := textproto.NewReader(b.r).ReadMIMEHeader()
	if err != nil {
		if err == io.EOF {
			return errTrailerEOF
		}
		return err
	}
	switch rr := b.hdr.(type) {
	case *Request:
		mergeSetHeader(&rr.Trailer, Header(hdr))
	case *Response:

		return nil, err
	}

	if justAuthority {
		// Strip the bogus "http://" back off.
		req.URL.Scheme = ""
	}

	// Subsequent lines: Key: value.
	mimeHeader, err := tp.ReadMIMEHeader()
	if err != nil {
		return nil, err
	}
	req.Header = Header(mimeHeader)
	if len(req.Header["Host"]) > 1 {
		return nil, fmt.Errorf("too many Host headers")
	}

		{"(*Conn).ReadDotBytes", Method, 0},
		{"(*Conn).ReadDotLines", Method, 0},
		{"(*Conn).ReadLine", Method, 0},
		{"(*Conn).ReadLineBytes", Method, 0},
		{"(*Conn).ReadMIMEHeader", Method, 0},
		{"(*Conn).ReadResponse", Method, 0},
		{"(*Conn).StartRequest", Method, 0},
		{"(*Conn).StartResponse", Method, 0},
		{"(*Error).Error", Method, 0},
		{"(*Pipeline).EndRequest", Method, 0},

pkg net/textproto, method (*Conn) ReadLine() (string, error)
pkg net/textproto, method (*Conn) ReadLineBytes() ([]uint8, error)
pkg net/textproto, method (*Conn) ReadMIMEHeader() (MIMEHeader, error)
pkg net/textproto, method (*Conn) ReadResponse(int) (int, string, error)
pkg net/textproto, method (*Conn) StartRequest(uint)
pkg net/textproto, method (*Conn) StartResponse(uint)