package idxfile

import (
	
	
	

	
)
Encoder writes MemoryIndex structs to an output stream.
type Encoder struct {
	io.Writer
	hash hash.Hash
}
NewEncoder returns a new stream encoder that writes to w.
func ( io.Writer) *Encoder {
	 := sha1.New()
	 := io.MultiWriter(, )
	return &Encoder{, }
}
Encode encodes an MemoryIndex to the encoder writer.
func ( *Encoder) ( *MemoryIndex) (int, error) {
	 := []func(*MemoryIndex) (int, error){
		.encodeHeader,
		.encodeFanout,
		.encodeHashes,
		.encodeCRC32,
		.encodeOffsets,
		.encodeChecksums,
	}

	 := 0
	for ,  := range  {
		,  := ()
		 += 

		if  != nil {
			return , 
		}
	}

	return , nil
}

func ( *Encoder) ( *MemoryIndex) (int, error) {
	,  := .Write(idxHeader)
	if  != nil {
		return , 
	}

	return  + 4, binary.WriteUint32(, .Version)
}

func ( *Encoder) ( *MemoryIndex) (int, error) {
	for ,  := range .Fanout {
		if  := binary.WriteUint32(, );  != nil {
			return 0, 
		}
	}

	return fanout * 4, nil
}

func ( *Encoder) ( *MemoryIndex) (int, error) {
	var  int
	for  := 0;  < fanout; ++ {
		 := .FanoutMapping[]
		if  == noMapping {
			continue
		}

		,  := .Write(.Names[])
		if  != nil {
			return , 
		}
		 += 
	}
	return , nil
}

func ( *Encoder) ( *MemoryIndex) (int, error) {
	var  int
	for  := 0;  < fanout; ++ {
		 := .FanoutMapping[]
		if  == noMapping {
			continue
		}

		,  := .Write(.CRC32[])
		if  != nil {
			return , 
		}

		 += 
	}

	return , nil
}

func ( *Encoder) ( *MemoryIndex) (int, error) {
	var  int
	for  := 0;  < fanout; ++ {
		 := .FanoutMapping[]
		if  == noMapping {
			continue
		}

		,  := .Write(.Offset32[])
		if  != nil {
			return , 
		}

		 += 
	}

	if len(.Offset64) > 0 {
		,  := .Write(.Offset64)
		if  != nil {
			return , 
		}

		 += 
	}

	return , nil
}

func ( *Encoder) ( *MemoryIndex) (int, error) {
	if ,  := .Write(.PackfileChecksum[:]);  != nil {
		return 0, 
	}

	copy(.IdxChecksum[:], .hash.Sum(nil)[:20])
	if ,  := .Write(.IdxChecksum[:]);  != nil {
		return 0, 
	}

	return 40, nil