Function Encode

encode.go:20–43

Encode returns the encoded form of src. The returned slice may be a sub- slice of dst if dst was large enough to hold the entire encoded block. Otherwise, a newly allocated slice will be returned. The dst and src must not overlap. It is valid to pass a nil dst. Encode handles the Snappy block form

(dst, src []byte)

//
// Encode handles the Snappy block format, not the Snappy stream format.
func Encode(dst, src []byte) []byte {
	if n := MaxEncodedLen(len(src)); n < 0 {
		panic(ErrTooLarge)
	} else if len(dst) < n {
		dst = make([]byte, n)
	}

	// The block starts with the varint-encoded length of the decompressed bytes.
	d := binary.PutUvarint(dst, uint64(len(src)))

	for len(src) > 0 {
		p := src
		src = nil
		if len(p) > maxBlockSize {
			p, src = p[:maxBlockSize], p[maxBlockSize:]
		}
		if len(p) < minNonLiteralBlockSize {
			d += emitLiteral(dst[d:], p)
		} else {
			d += encodeBlock(dst[d:], p)
		}
	}
	return dst[:d]
}

// inputMargin is the minimum number of extra input bytes to keep, inside
// encodeBlock's inner loop. On some architectures, this margin lets us