From 7b320119ba532fd409ec7dade7ad02011c309599 Mon Sep 17 00:00:00 2001
From: Niall Sheridan <nsheridan@gmail.com>
Date: Wed, 18 Oct 2017 13:15:14 +0100
Subject: Update dependencies

---
 .../vault/helper/compressutil/compress.go          | 40 +++++++++++++++++++---
 1 file changed, 36 insertions(+), 4 deletions(-)

(limited to 'vendor/github.com/hashicorp/vault/helper/compressutil/compress.go')

diff --git a/vendor/github.com/hashicorp/vault/helper/compressutil/compress.go b/vendor/github.com/hashicorp/vault/helper/compressutil/compress.go
index e485f2f..31a2dcd 100644
--- a/vendor/github.com/hashicorp/vault/helper/compressutil/compress.go
+++ b/vendor/github.com/hashicorp/vault/helper/compressutil/compress.go
@@ -6,6 +6,8 @@ import (
 	"compress/lzw"
 	"fmt"
 	"io"
+
+	"github.com/golang/snappy"
 )
 
 const (
@@ -20,16 +22,35 @@ const (
 	// Byte value used as canary when using Lzw format
 	CompressionCanaryLzw byte = 'L'
 
+	// Byte value used as canary when using Snappy format
+	CompressionCanarySnappy byte = 'S'
+
 	CompressionTypeLzw = "lzw"
 
 	CompressionTypeGzip = "gzip"
+
+	CompressionTypeSnappy = "snappy"
 )
 
+// SnappyReadCloser embeds the snappy reader which implements the io.Reader
+// interface. The decompress procedure in this utility expectes an
+// io.ReadCloser. This type implements the io.Closer interface to retain the
+// generic way of decompression.
+type SnappyReadCloser struct {
+	*snappy.Reader
+}
+
+// Close is a noop method implemented only to satisfy the io.Closer interface
+func (s *SnappyReadCloser) Close() error {
+	return nil
+}
+
 // CompressionConfig is used to select a compression type to be performed by
 // Compress and Decompress utilities.
 // Supported types are:
 // * CompressionTypeLzw
 // * CompressionTypeGzip
+// * CompressionTypeSnappy
 //
 // When using CompressionTypeGzip, the compression levels can also be chosen:
 // * gzip.DefaultCompression
@@ -78,9 +99,13 @@ func Compress(data []byte, config *CompressionConfig) ([]byte, error) {
 			config.GzipCompressionLevel = gzip.DefaultCompression
 		}
 		writer, err = gzip.NewWriterLevel(&buf, config.GzipCompressionLevel)
+	case CompressionTypeSnappy:
+		buf.Write([]byte{CompressionCanarySnappy})
+		writer = snappy.NewBufferedWriter(&buf)
 	default:
 		return nil, fmt.Errorf("unsupported compression type")
 	}
+
 	if err != nil {
 		return nil, fmt.Errorf("failed to create a compression writer; err: %v", err)
 	}
@@ -117,22 +142,29 @@ func Decompress(data []byte) ([]byte, bool, error) {
 	}
 
 	switch {
+	// If the first byte matches the canary byte, remove the canary
+	// byte and try to decompress the data that is after the canary.
 	case data[0] == CompressionCanaryGzip:
-		// If the first byte matches the canary byte, remove the canary
-		// byte and try to decompress the data that is after the canary.
 		if len(data) < 2 {
 			return nil, false, fmt.Errorf("invalid 'data' after the canary")
 		}
 		data = data[1:]
 		reader, err = gzip.NewReader(bytes.NewReader(data))
 	case data[0] == CompressionCanaryLzw:
-		// If the first byte matches the canary byte, remove the canary
-		// byte and try to decompress the data that is after the canary.
 		if len(data) < 2 {
 			return nil, false, fmt.Errorf("invalid 'data' after the canary")
 		}
 		data = data[1:]
 		reader = lzw.NewReader(bytes.NewReader(data), lzw.LSB, 8)
+
+	case data[0] == CompressionCanarySnappy:
+		if len(data) < 2 {
+			return nil, false, fmt.Errorf("invalid 'data' after the canary")
+		}
+		data = data[1:]
+		reader = &SnappyReadCloser{
+			Reader: snappy.NewReader(bytes.NewReader(data)),
+		}
 	default:
 		// If the first byte doesn't match the canary byte, it means
 		// that the content was not compressed at all. Indicate the
-- 
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