Update vendor

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

gateway/vendor/github.com/klauspost/compress/flate/deflate.go

@@ -861,7 +861,7 @@ func (d *compressor) reset(w io.Writer) {
 	}
 	switch d.compressionLevel.chain {
 	case 0:
-		// level was NoCompression or ConstantCompresssion.
+		// level was NoCompression or ConstantCompression.
 		d.windowEnd = 0
 	default:
 		s := d.state

gateway/vendor/github.com/klauspost/compress/flate/inflate.go

@@ -298,6 +298,14 @@ const (
 	huffmanGenericReader
 )
 
+// flushMode tells decompressor when to return data
+type flushMode uint8
+
+const (
+	syncFlush    flushMode = iota // return data after sync flush block
+	partialFlush                  // return data after each block
+)
+
 // Decompress state.
 type decompressor struct {
 	// Input source.
@@ -332,6 +340,8 @@ type decompressor struct {
 
 	nb    uint
 	final bool
+
+	flushMode flushMode
 }
 
 func (f *decompressor) nextBlock() {
@@ -618,7 +628,10 @@ func (f *decompressor) dataBlock() {
 	}
 
 	if n == 0 {
-		f.toRead = f.dict.readFlush()
+		if f.flushMode == syncFlush {
+			f.toRead = f.dict.readFlush()
+		}
+
 		f.finishBlock()
 		return
 	}
@@ -657,8 +670,12 @@ func (f *decompressor) finishBlock() {
 		if f.dict.availRead() > 0 {
 			f.toRead = f.dict.readFlush()
 		}
+
 		f.err = io.EOF
+	} else if f.flushMode == partialFlush && f.dict.availRead() > 0 {
+		f.toRead = f.dict.readFlush()
 	}
+
 	f.step = nextBlock
 }
 
@@ -789,6 +806,41 @@ func (f *decompressor) Reset(r io.Reader, dict []byte) error {
 	return nil
 }
 
+type ReaderOpt func(*decompressor)
+
+// WithPartialBlock tells decompressor to return after each block,
+// so it can read data written with partial flush
+func WithPartialBlock() ReaderOpt {
+	return func(f *decompressor) {
+		f.flushMode = partialFlush
+	}
+}
+
+// WithDict initializes the reader with a preset dictionary
+func WithDict(dict []byte) ReaderOpt {
+	return func(f *decompressor) {
+		f.dict.init(maxMatchOffset, dict)
+	}
+}
+
+// NewReaderOpts returns new reader with provided options
+func NewReaderOpts(r io.Reader, opts ...ReaderOpt) io.ReadCloser {
+	fixedHuffmanDecoderInit()
+
+	var f decompressor
+	f.r = makeReader(r)
+	f.bits = new([maxNumLit + maxNumDist]int)
+	f.codebits = new([numCodes]int)
+	f.step = nextBlock
+	f.dict.init(maxMatchOffset, nil)
+
+	for _, opt := range opts {
+		opt(&f)
+	}
+
+	return &f
+}
+
 // NewReader returns a new ReadCloser that can be used
 // to read the uncompressed version of r.
 // If r does not also implement io.ByteReader,
@@ -798,15 +850,7 @@ func (f *decompressor) Reset(r io.Reader, dict []byte) error {
 //
 // The ReadCloser returned by NewReader also implements Resetter.
 func NewReader(r io.Reader) io.ReadCloser {
-	fixedHuffmanDecoderInit()
-
-	var f decompressor
-	f.r = makeReader(r)
-	f.bits = new([maxNumLit + maxNumDist]int)
-	f.codebits = new([numCodes]int)
-	f.step = nextBlock
-	f.dict.init(maxMatchOffset, nil)
-	return &f
+	return NewReaderOpts(r)
 }
 
 // NewReaderDict is like NewReader but initializes the reader
@@ -817,13 +861,5 @@ func NewReader(r io.Reader) io.ReadCloser {
 //
 // The ReadCloser returned by NewReader also implements Resetter.
 func NewReaderDict(r io.Reader, dict []byte) io.ReadCloser {
-	fixedHuffmanDecoderInit()
-
-	var f decompressor
-	f.r = makeReader(r)
-	f.bits = new([maxNumLit + maxNumDist]int)
-	f.codebits = new([numCodes]int)
-	f.step = nextBlock
-	f.dict.init(maxMatchOffset, dict)
-	return &f
+	return NewReaderOpts(r, WithDict(dict))
 }