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: meminfo.go
    path of file: ./repos/corteza/server/vendor/github.com/prometheus/procfs
    
    the code of the file until where you have to start completion: // Copyright 2019 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package procfs

import (
	"bufio"
	"bytes"
	"fmt"
	"io"
	"strconv"
	"strings"

	"github.com/prometheus/procfs/internal/util"
)

// Meminfo represents memory statistics.
type Meminfo struct {
	// Total usable ram (i.e. physical ram minus a few reserved
	// bits and the kernel binary code)
	MemTotal *uint64
	// The sum of LowFree+HighFree
	MemFree *uint64
	// An estimate of how much memory is available for starting
	// new applications, without swapping. Calculated from
	// MemFree, SReclaimable, the size of the file LRU lists, and
	// the low watermarks in each zone.  The estimate takes into
	// account that the system needs some page cache to function
	// well, and that not all reclaimable slab will be
	// reclaimable, due to items being in use. The impact of those
	// factors will vary from system to system.
	MemAvailable *uint64
	// Relatively temporary storage for raw disk blocks shouldn't
	// get tremendously large (20MB or so)
	Buffers *uint64
	Cached  *uint64
	// Memory that once was swapped out, is swapped back in but
	// still also is in the swapfile (if memory is needed it
	// doesn't need to be swapped out AGAIN because it is already
	// in the swapfile. This saves I/O)
	SwapCached *uint64
	// Memory that has been used more recently and usually not
	// reclaimed unless absolutely necessary.
	Active *uint64
	// Memory which has been less recently used.  It is more
	// eligible to be reclaimed for other purposes
	Inactive     *uint64
	ActiveAnon   *uint64
	InactiveAnon *uint64
	ActiveFile   *uint64
	InactiveFile *uint64
	Unevictable  *uint64
	Mlocked      *uint64
	// total amount of swap space available
	SwapTotal *uint64
	// Memory which has been evicted from RAM, and is temporarily
	// on the disk
	SwapFree *uint64
	// Memory which is waiting to get written back to the disk
	Dirty *uint64
	// Memory which is actively being written back to the disk
	Writeback *uint6
    
func parseMemInfo(r io.Reader) (*Meminfo, error) {
	var m Meminfo
	s := bufio.NewScanner(r)
	for s.Scan() {
		// Each line has at least a name and value; we ignore the unit.
		fields := strings.Fields(s.Text())
		if len(fields) < 2 {
			return nil, fmt.Errorf("malformed meminfo line: %q", s.Text())
		}

		v, err := strconv.ParseUint(fields[1], 0, 64)
		if err != nil {
			return nil, err
		}

		switch fields[0] {
		case "MemTotal:":
			m.MemTotal = &v
		case "MemFree:":
			m.MemFree = &v
		case "MemAvailable:":
			m.MemAvailable = &v
		case "Buffers:":
			m.Buffers = &v
		case "Cached:":
			m.Cached = &v
		case "SwapCached:":
			m.SwapCached = &v
		case "Active:":
			m.Active = &v
		case "Inactive:":
			m.Inactive = &v
		case "Active(anon):":
			m.ActiveAnon = &v
		case "Inactive(anon):":
			m.InactiveAnon = &v
		case "Active(file):":
			m.ActiveFile = &v
		case "Inactive(file):":
			m.InactiveFile = &v
		case "Unevictable:":
			m.Unevictable = &v
		case "Mlocked:":
			m.Mlocked = &v
		case "SwapTotal:":
			m.SwapTotal = &v
		case "SwapFree:":
			m.SwapFree = &v
		case "Dirty:":
			m.Dirty = &v
		case "Writeback:":
			m.Writeback = &v
		case "AnonPages:":
			m.AnonPages = &v
		case "Mapped:":
			m.Mapped = &v
		case "Shmem:":
			m.Shmem = &v
		case "Slab:":
			m.Slab = &v
		case "SReclaimable:":
			m.SReclaimable = &v
		case "SUnreclaim:":
			m.SUnreclaim = &v
		case "KernelStack:":
			m.KernelStack = &v
		case "PageTables:":
			m.PageTables = &v
		case "NFS_Unstable:":
			m.NFSUnstable = &v
		case "Bounce:":
			m.Bounce = &v
		case "WritebackTmp:":
			m.WritebackTmp = &v
		case "CommitLimit:":
			m.CommitLimit = &v
		case "Committed_AS:":
			m.CommittedAS = &v
		case "VmallocTotal:":
			m.VmallocTotal = &v
		case "VmallocUsed:":
			m.VmallocUsed = &v
		case "VmallocChunk:":
			m.VmallocChunk = &v
		case "HardwareCorrupted:":
			m.HardwareCorrupted = &v
		case "AnonHugePages:":
			m.AnonHugePages = &v
		case "ShmemHugePages:":
			m.ShmemHugePages = &v
		case "ShmemPmdMapped:":
			m.ShmemPmdMapped = &v
		case "CmaTotal:":
			m.CmaTotal = &v
		case "CmaFree:":
			m.CmaFree = &v
		case "HugePages_Total:":
			m.HugePagesTotal = &v
		case "HugePages_Free:":
			m.HugePagesFree = &v
		case "HugePages_Rsvd:":
			m.HugePagesRsvd = &v
		case "HugePages_Surp:":
			m.HugePagesSurp = &v
		case "Hugepagesize:":
			m.Hugepagesize = &v
		case "DirectMap4k:":
			m.DirectMap4k = &v
		case "DirectMap2M:":
			m.DirectMap2M = &v
		case "DirectMap1G:":
			m.DirectMap1G = &v
		}
	}

	return &m, nil
}