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: blockdec.go
    path of file: ./repos/k6/vendor/github.com/klauspost/compress/zstd
    
    the code of the file until where you have to start completion: // Copyright 2019+ Klaus Post. All rights reserved.
// License information can be found in the LICENSE file.
// Based on work by Yann Collet, released under BSD License.

package zstd

import (
	"bytes"
	"encoding/binary"
	"errors"
	"fmt"
	"hash/crc32"
	"io"
	"os"
	"path/filepath"
	"sync"

	"github.com/klauspost/compress/huff0"
	"github.com/klauspost/compress/zstd/internal/xxhash"
)

type blockType uint8

//go:generate stringer -type=blockType,literalsBlockType,seqCompMode,tableIndex

const (
	blockTypeRaw blockType = iota
	blockTypeRLE
	blockTypeCompr
    
func (b *blockDec) decodeBuf(hist *history) error {
	switch b.Type {
	case blockTypeRLE:
		if cap(b.dst) < int(b.RLESize) {
			if b.lowMem {
				b.dst = make([]byte, b.RLESize)
			} else {
				b.dst = make([]byte, maxCompressedBlockSize)
			}
		}
		b.dst = b.dst[:b.RLESize]
		v := b.data[0]
		for i := range b.dst {
			b.dst[i] = v
		}
		hist.appendKeep(b.dst)
		return nil
	case blockTypeRaw:
		hist.appendKeep(b.data)
		return nil
	case blockTypeCompressed:
		saved := b.dst
		// Append directly to history
		if hist.ignoreBuffer == 0 {
			b.dst = hist.b
			hist.b = nil
		} else {
			b.dst = b.dst[:0]
		}
		err := b.decodeCompressed(hist)
		if debugDecoder {
			println("Decompressed to total", len(b.dst), "bytes, hash:", xxhash.Sum64(b.dst), "error:", err)
		}
		if hist.ignoreBuffer == 0 {
			hist.b = b.dst
			b.dst = saved
		} else {
			hist.appendKeep(b.dst)
		}
		return err
	case blockTypeReserved:
		// Used for returning errors.
		return b.err
	default:
		panic("Invalid block type")
	}
}