You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: encode_other.go
    path of file: ./repos/cloud-torrent/vendor/github.com/golang/snappy
    
    the code of the file until where you have to start completion: // Copyright 2016 The Snappy-Go Authors. All rights reserved
    
func emitCopy(dst []byte, offset, length int) int {
	i := 0
	// The maximum length for a single tagCopy1 or tagCopy2 op is 64 bytes. The
	// threshold for this loop is a little higher (at 68 = 64 + 4), and the
	// length emitted down below is is a little lower (at 60 = 64 - 4), because
	// it's shorter to encode a length 67 copy as a length 60 tagCopy2 followed
	// by a length 7 tagCopy1 (which encodes as 3+2 bytes) than to encode it as
	// a length 64 tagCopy2 followed by a length 3 tagCopy2 (which encodes as
	// 3+3 bytes). The magic 4 in the 64Â±4 is because the minimum length for a
	// tagCopy1 op is 4 bytes, which is why a length 3 copy has to be an
	// encodes-as-3-bytes tagCopy2 instead of an encodes-as-2-bytes tagCopy1.
	for length >= 68 {
		// Emit a length 64 copy, encoded as 3 bytes.
		dst[i+0] = 63<<2 | tagCopy2
		dst[i+1] = uint8(offset)
		dst[i+2] = uint8(offset >> 8)
		i += 3
		length -= 64
	}
	if length > 64 {
		// Emit a length 60 copy, encoded as 3 bytes.
		dst[i+0] = 59<<2 | tagCopy2
		dst[i+1] = uint8(offset)
		dst[i+2] = uint8(offset >> 8)
		i += 3
		length -= 60
	}
	if length >= 12 || offset >= 2048 {
		// Emit the remaining copy, encoded as 3 bytes.
		dst[i+0] = uint8(length-1)<<2 | tagCopy2
		dst[i+1] = uint8(offset)
		dst[i+2] = uint8(offset >> 8)
		return i + 3
	}
	// Emit the remaining copy, encoded as 2 bytes.
	dst[i+0] = uint8(offset>>8)<<5 | uint8(length-4)<<2 | tagCopy1
	dst[i+1] = uint8(offset)
	return i + 2
}