Upgrade AWS SDK to the latest version

vendor/github.com/aws/aws-sdk-go/service/glacier/treehash_test.go

@@ -2,18 +2,16 @@ package glacier_test
 
 import (
 	"bytes"
+	"crypto/sha256"
 	"fmt"
+	"io"
 
 	"github.com/aws/aws-sdk-go/service/glacier"
 )
 
 func ExampleComputeHashes() {
-	buf := make([]byte, 5767168) // 5.5MB buffer
-	for i := range buf {
-		buf[i] = '0' // Fill with zero characters
-	}
+	r := testCreateReader()
 
-	r := bytes.NewReader(buf)
 	h := glacier.ComputeHashes(r)
 	n, _ := r.Seek(0, 1) // Check position after checksumming
 
@@ -26,3 +24,40 @@ func ExampleComputeHashes() {
 	// tree: 154e26c78fd74d0c2c9b3cc4644191619dc4f2cd539ae2a74d5fd07957a3ee6a
 	// pos: 0
 }
+
+func testCreateReader() io.ReadSeeker {
+	buf := make([]byte, 5767168) // 5.5MB buffer
+	for i := range buf {
+		buf[i] = '0' // Fill with zero characters
+	}
+
+	return bytes.NewReader(buf)
+}
+
+func ExampleComputeTreeHash() {
+	r := testCreateReader()
+
+	const chunkSize = 1024 * 1024 // 1MB
+	buf := make([]byte, chunkSize)
+	hashes := [][]byte{}
+
+	for {
+		// Reach 1MB chunks from reader to generate hashes from
+		n, err := io.ReadAtLeast(r, buf, chunkSize)
+		if n == 0 {
+			break
+		}
+
+		tmpHash := sha256.Sum256(buf[:n])
+		hashes = append(hashes, tmpHash[:])
+		if err != nil {
+			break // last chunk
+		}
+	}
+
+	treeHash := glacier.ComputeTreeHash(hashes)
+	fmt.Printf("TreeHash: %x\n", treeHash)
+
+	// Output:
+	// TreeHash: 154e26c78fd74d0c2c9b3cc4644191619dc4f2cd539ae2a74d5fd07957a3ee6a
+}