MM-32048: Upgrade dependencies (#16765)

```release-note
Updated Go dependencies to their latest minor version
```

https://mattermost.atlassian.net/browse/MM-32048

vendor/github.com/klauspost/compress/flate/gen_inflate.go

@@ -1,294 +0,0 @@
-// +build generate
-
-//go:generate go run $GOFILE && gofmt -w inflate_gen.go
-
-package main
-
-import (
-	"os"
-	"strings"
-)
-
-func main() {
-	f, err := os.Create("inflate_gen.go")
-	if err != nil {
-		panic(err)
-	}
-	defer f.Close()
-	types := []string{"*bytes.Buffer", "*bytes.Reader", "*bufio.Reader", "*strings.Reader"}
-	names := []string{"BytesBuffer", "BytesReader", "BufioReader", "StringsReader"}
-	imports := []string{"bytes", "bufio", "io", "strings", "math/bits"}
-	f.WriteString(`// Code generated by go generate gen_inflate.go. DO NOT EDIT.
-
-package flate
-
-import (
-`)
-
-	for _, imp := range imports {
-		f.WriteString("\t\"" + imp + "\"\n")
-	}
-	f.WriteString(")\n\n")
-
-	template := `
-
-// Decode a single Huffman block from f.
-// hl and hd are the Huffman states for the lit/length values
-// and the distance values, respectively. If hd == nil, using the
-// fixed distance encoding associated with fixed Huffman blocks.
-func (f *decompressor) $FUNCNAME$() {
-	const (
-		stateInit = iota // Zero value must be stateInit
-		stateDict
-	)
-	fr := f.r.($TYPE$)
-
-	switch f.stepState {
-	case stateInit:
-		goto readLiteral
-	case stateDict:
-		goto copyHistory
-	}
-
-readLiteral:
-	// Read literal and/or (length, distance) according to RFC section 3.2.3.
-	{
-		var v int
-		{
-			// Inlined v, err := f.huffSym(f.hl)
-			// Since a huffmanDecoder can be empty or be composed of a degenerate tree
-			// with single element, huffSym must error on these two edge cases. In both
-			// cases, the chunks slice will be 0 for the invalid sequence, leading it
-			// satisfy the n == 0 check below.
-			n := uint(f.hl.maxRead)
-			// Optimization. Compiler isn't smart enough to keep f.b,f.nb in registers,
-			// but is smart enough to keep local variables in registers, so use nb and b,
-			// inline call to moreBits and reassign b,nb back to f on return.
-			nb, b := f.nb, f.b
-			for {
-				for nb < n {
-					c, err := fr.ReadByte()
-					if err != nil {
-						f.b = b
-						f.nb = nb
-						f.err = noEOF(err)
-						return
-					}
-					f.roffset++
-					b |= uint32(c) << (nb & regSizeMaskUint32)
-					nb += 8
-				}
-				chunk := f.hl.chunks[b&(huffmanNumChunks-1)]
-				n = uint(chunk & huffmanCountMask)
-				if n > huffmanChunkBits {
-					chunk = f.hl.links[chunk>>huffmanValueShift][(b>>huffmanChunkBits)&f.hl.linkMask]
-					n = uint(chunk & huffmanCountMask)
-				}
-				if n <= nb {
-					if n == 0 {
-						f.b = b
-						f.nb = nb
-						if debugDecode {
-							fmt.Println("huffsym: n==0")
-						}
-						f.err = CorruptInputError(f.roffset)
-						return
-					}
-					f.b = b >> (n & regSizeMaskUint32)
-					f.nb = nb - n
-					v = int(chunk >> huffmanValueShift)
-					break
-				}
-			}
-		}
-
-		var length int
-		switch {
-		case v < 256:
-			f.dict.writeByte(byte(v))
-			if f.dict.availWrite() == 0 {
-				f.toRead = f.dict.readFlush()
-				f.step = (*decompressor).$FUNCNAME$
-				f.stepState = stateInit
-				return
-			}
-			goto readLiteral
-		case v == 256:
-			f.finishBlock()
-			return
-		// otherwise, reference to older data
-		case v < 265:
-			length = v - (257 - 3)
-		case v < maxNumLit:
-			val := decCodeToLen[(v - 257)]
-			length = int(val.length) + 3
-			n := uint(val.extra)
-			for f.nb < n {
-				c, err := fr.ReadByte()
-				if err != nil {
-					if debugDecode {
-						fmt.Println("morebits n>0:", err)
-					}
-					f.err = err
-					return
-				}
-				f.roffset++
-				f.b |= uint32(c) << f.nb
-				f.nb += 8	
-			}
-			length += int(f.b & uint32(1<<(n&regSizeMaskUint32)-1))
-			f.b >>= n & regSizeMaskUint32
-			f.nb -= n
-		default:
-			if debugDecode {
-				fmt.Println(v, ">= maxNumLit")
-			}
-			f.err = CorruptInputError(f.roffset)
-			return
-		}
-
-		var dist uint32
-		if f.hd == nil {
-			for f.nb < 5 {
-				c, err := fr.ReadByte()
-				if err != nil {
-					if debugDecode {
-						fmt.Println("morebits f.nb<5:", err)
-					}
-					f.err = err
-					return
-				}
-				f.roffset++
-				f.b |= uint32(c) << f.nb
-				f.nb += 8
-			}
-			dist = uint32(bits.Reverse8(uint8(f.b & 0x1F << 3)))
-			f.b >>= 5
-			f.nb -= 5
-		} else {
-			// Since a huffmanDecoder can be empty or be composed of a degenerate tree
-			// with single element, huffSym must error on these two edge cases. In both
-			// cases, the chunks slice will be 0 for the invalid sequence, leading it
-			// satisfy the n == 0 check below.
-			n := uint(f.hd.maxRead)
-			// Optimization. Compiler isn't smart enough to keep f.b,f.nb in registers,
-			// but is smart enough to keep local variables in registers, so use nb and b,
-			// inline call to moreBits and reassign b,nb back to f on return.
-			nb, b := f.nb, f.b
-			for {
-				for nb < n {
-					c, err := fr.ReadByte()
-					if err != nil {
-						f.b = b
-						f.nb = nb
-						f.err = noEOF(err)
-						return
-					}
-					f.roffset++
-					b |= uint32(c) << (nb & regSizeMaskUint32)
-					nb += 8
-				}
-				chunk := f.hd.chunks[b&(huffmanNumChunks-1)]
-				n = uint(chunk & huffmanCountMask)
-				if n > huffmanChunkBits {
-					chunk = f.hd.links[chunk>>huffmanValueShift][(b>>huffmanChunkBits)&f.hd.linkMask]
-					n = uint(chunk & huffmanCountMask)
-				}
-				if n <= nb {
-					if n == 0 {
-						f.b = b
-						f.nb = nb
-						if debugDecode {
-							fmt.Println("huffsym: n==0")
-						}
-						f.err = CorruptInputError(f.roffset)
-						return
-					}
-					f.b = b >> (n & regSizeMaskUint32)
-					f.nb = nb - n
-					dist = uint32(chunk >> huffmanValueShift)
-					break
-				}
-			}
-		}
-
-		switch {
-		case dist < 4:
-			dist++
-		case dist < maxNumDist:
-			nb := uint(dist-2) >> 1
-			// have 1 bit in bottom of dist, need nb more.
-			extra := (dist & 1) << (nb & regSizeMaskUint32)
-			for f.nb < nb {
-				c, err := fr.ReadByte()
-				if err != nil {
-					if debugDecode {
-						fmt.Println("morebits f.nb<nb:", err)
-					}
-					f.err = err
-					return
-				}
-				f.roffset++
-				f.b |= uint32(c) << f.nb
-				f.nb += 8
-			}
-			extra |= f.b & uint32(1<<(nb&regSizeMaskUint32)-1)
-			f.b >>= nb & regSizeMaskUint32
-			f.nb -= nb
-			dist = 1<<((nb+1)&regSizeMaskUint32) + 1 + extra
-		default:
-			if debugDecode {
-				fmt.Println("dist too big:", dist, maxNumDist)
-			}
-			f.err = CorruptInputError(f.roffset)
-			return
-		}
-
-		// No check on length; encoding can be prescient.
-		if dist > uint32(f.dict.histSize()) {
-			if debugDecode {
-				fmt.Println("dist > f.dict.histSize():", dist, f.dict.histSize())
-			}
-			f.err = CorruptInputError(f.roffset)
-			return
-		}
-
-		f.copyLen, f.copyDist = length, int(dist)
-		goto copyHistory
-	}
-
-copyHistory:
-	// Perform a backwards copy according to RFC section 3.2.3.
-	{
-		cnt := f.dict.tryWriteCopy(f.copyDist, f.copyLen)
-		if cnt == 0 {
-			cnt = f.dict.writeCopy(f.copyDist, f.copyLen)
-		}
-		f.copyLen -= cnt
-
-		if f.dict.availWrite() == 0 || f.copyLen > 0 {
-			f.toRead = f.dict.readFlush()
-			f.step = (*decompressor).$FUNCNAME$ // We need to continue this work
-			f.stepState = stateDict
-			return
-		}
-		goto readLiteral
-	}
-}
-
-`
-	for i, t := range types {
-		s := strings.Replace(template, "$FUNCNAME$", "huffman"+names[i], -1)
-		s = strings.Replace(s, "$TYPE$", t, -1)
-		f.WriteString(s)
-	}
-	f.WriteString("func (f *decompressor) huffmanBlockDecoder() func() {\n")
-	f.WriteString("\tswitch f.r.(type) {\n")
-	for i, t := range types {
-		f.WriteString("\t\tcase " + t + ":\n")
-		f.WriteString("\t\t\treturn f.huffman" + names[i] + "\n")
-	}
-	f.WriteString("\t\tdefault:\n")
-	f.WriteString("\t\t\treturn f.huffmanBlockGeneric")
-	f.WriteString("\t}\n}\n")
-}

vendor/github.com/klauspost/compress/huff0/README.md

@@ -14,7 +14,9 @@ but it can be used as a secondary step to compressors (like Snappy) that does no
 
 ## News
 
- * Mar 2018: First implementation released. Consider this beta software for now.
+This is used as part of the [zstandard](https://github.com/klauspost/compress/tree/master/zstd#zstd) compression and decompression package.
+
+This ensures that most functionality is well tested.
 
 # Usage
 

vendor/github.com/klauspost/compress/zstd/decoder.go

@@ -5,7 +5,6 @@
 package zstd
 
 import (
-	"bytes"
 	"errors"
 	"io"
 	"sync"
@@ -85,6 +84,10 @@ func NewReader(r io.Reader, opts ...DOption) (*Decoder, error) {
 	d.current.output = make(chan decodeOutput, d.o.concurrent)
 	d.current.flushed = true
 
+	if r == nil {
+		d.current.err = ErrDecoderNilInput
+	}
+
 	// Transfer option dicts.
 	d.dicts = make(map[uint32]dict, len(d.o.dicts))
 	for _, dc := range d.o.dicts {
@@ -111,7 +114,7 @@ func NewReader(r io.Reader, opts ...DOption) (*Decoder, error) {
 // When the stream is done, io.EOF will be returned.
 func (d *Decoder) Read(p []byte) (int, error) {
 	if d.stream == nil {
-		return 0, errors.New("no input has been initialized")
+		return 0, ErrDecoderNilInput
 	}
 	var n int
 	for {
@@ -152,12 +155,20 @@ func (d *Decoder) Read(p []byte) (int, error) {
 
 // Reset will reset the decoder the supplied stream after the current has finished processing.
 // Note that this functionality cannot be used after Close has been called.
+// Reset can be called with a nil reader to release references to the previous reader.
+// After being called with a nil reader, no other operations than Reset or DecodeAll or Close
+// should be used.
 func (d *Decoder) Reset(r io.Reader) error {
 	if d.current.err == ErrDecoderClosed {
 		return d.current.err
 	}
+
+	d.drainOutput()
+
 	if r == nil {
-		return errors.New("nil Reader sent as input")
+		d.current.err = ErrDecoderNilInput
+		d.current.flushed = true
+		return nil
 	}
 
 	if d.stream == nil {
@@ -166,14 +177,14 @@ func (d *Decoder) Reset(r io.Reader) error {
 		go d.startStreamDecoder(d.stream)
 	}
 
-	d.drainOutput()
-
 	// If bytes buffer and < 1MB, do sync decoding anyway.
-	if bb, ok := r.(*bytes.Buffer); ok && bb.Len() < 1<<20 {
+	if bb, ok := r.(byter); ok && bb.Len() < 1<<20 {
+		var bb2 byter
+		bb2 = bb
 		if debug {
 			println("*bytes.Buffer detected, doing sync decode, len:", bb.Len())
 		}
-		b := bb.Bytes()
+		b := bb2.Bytes()
 		var dst []byte
 		if cap(d.current.b) > 0 {
 			dst = d.current.b
@@ -249,7 +260,7 @@ func (d *Decoder) drainOutput() {
 // Any error encountered during the write is also returned.
 func (d *Decoder) WriteTo(w io.Writer) (int64, error) {
 	if d.stream == nil {
-		return 0, errors.New("no input has been initialized")
+		return 0, ErrDecoderNilInput
 	}
 	var n int64
 	for {

vendor/github.com/klauspost/compress/zstd/seqdec.go

@@ -181,11 +181,18 @@ func (s *sequenceDecs) decode(seqs int, br *bitReader, hist []byte) error {
 			return fmt.Errorf("output (%d) bigger than max block size", size)
 		}
 		if size > cap(s.out) {
-			// Not enough size, will be extremely rarely triggered,
+			// Not enough size, which can happen under high volume block streaming conditions
 			// but could be if destination slice is too small for sync operations.
-			// We add maxBlockSize to the capacity.
-			s.out = append(s.out, make([]byte, maxBlockSize)...)
-			s.out = s.out[:len(s.out)-maxBlockSize]
+			// over-allocating here can create a large amount of GC pressure so we try to keep
+			// it as contained as possible
+			used := len(s.out) - startSize
+			addBytes := 256 + ll + ml + used>>2
+			// Clamp to max block size.
+			if used+addBytes > maxBlockSize {
+				addBytes = maxBlockSize - used
+			}
+			s.out = append(s.out, make([]byte, addBytes)...)
+			s.out = s.out[:len(s.out)-addBytes]
 		}
 		if ml > maxMatchLen {
 			return fmt.Errorf("match len (%d) bigger than max allowed length", ml)

vendor/github.com/klauspost/compress/zstd/zstd.go

@@ -4,6 +4,7 @@
 package zstd
 
 import (
+	"bytes"
 	"errors"
 	"log"
 	"math"
@@ -73,6 +74,10 @@ var (
 	// ErrDecoderClosed will be returned if the Decoder was used after
 	// Close has been called.
 	ErrDecoderClosed = errors.New("decoder used after Close")
+
+	// ErrDecoderNilInput is returned when a nil Reader was provided
+	// and an operation other than Reset/DecodeAll/Close was attempted.
+	ErrDecoderNilInput = errors.New("nil input provided as reader")
 )
 
 func println(a ...interface{}) {
@@ -142,3 +147,10 @@ func load64(b []byte, i int) uint64 {
 	return uint64(b[0]) | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24 |
 		uint64(b[4])<<32 | uint64(b[5])<<40 | uint64(b[6])<<48 | uint64(b[7])<<56
 }
+
+type byter interface {
+	Bytes() []byte
+	Len() int
+}
+
+var _ byter = &bytes.Buffer{}