package objfile

import (
	
	
	
	

	
)

var (
	ErrOverflow = errors.New("objfile: declared data length exceeded (overflow)")
)
Writer writes and encodes data in compressed objfile format to a provided io.Writer. Close should be called when finished with the Writer. Close will not close the underlying io.Writer.
type Writer struct {
	raw    io.Writer
	zlib   io.WriteCloser
	hasher plumbing.Hasher
	multi  io.Writer

	closed  bool
	pending int64 // number of unwritten bytes
}
NewWriter returns a new Writer writing to w. The returned Writer implements io.WriteCloser. Close should be called when finished with the Writer. Close will not close the underlying io.Writer.
func ( io.Writer) *Writer {
	return &Writer{
		raw:  ,
		zlib: zlib.NewWriter(),
	}
}
WriteHeader writes the type and the size and prepares to accept the object's contents. If an invalid t is provided, plumbing.ErrInvalidType is returned. If a negative size is provided, ErrNegativeSize is returned.
func ( *Writer) ( plumbing.ObjectType,  int64) error {
	if !.Valid() {
		return plumbing.ErrInvalidType
	}
	if  < 0 {
		return ErrNegativeSize
	}

	 := .Bytes()
	 = append(, ' ')
	 = append(, []byte(strconv.FormatInt(, 10))...)
	 = append(, 0)

	defer .prepareForWrite(, )
	,  := .zlib.Write()

	return 
}

func ( *Writer) ( plumbing.ObjectType,  int64) {
	.pending = 

	.hasher = plumbing.NewHasher(, )
	.multi = io.MultiWriter(.zlib, .hasher)
}
Write writes the object's contents. Write returns the error ErrOverflow if more than size bytes are written after WriteHeader.
func ( *Writer) ( []byte) ( int,  error) {
	if .closed {
		return 0, ErrClosed
	}

	 := false
	if int64(len()) > .pending {
		 = [0:.pending]
		 = true
	}

	,  = .multi.Write()
	.pending -= int64()
	if  == nil &&  {
		 = ErrOverflow
		return
	}

	return
}
Hash returns the hash of the object data stream that has been written so far. It can be called before or after Close.
func ( *Writer) () plumbing.Hash {
	return .hasher.Sum() // Not yet closed, return hash of data written so far
}
Close releases any resources consumed by the Writer. Calling Close does not close the wrapped io.Writer originally passed to NewWriter.
func ( *Writer) () error {
	if  := .zlib.Close();  != nil {
		return 
	}

	.closed = true
	return nil