1 files changed, 69 insertions, 0 deletions
diff --git a/vendor/golang.org/x/image/riff/riff_test.go b/vendor/golang.org/x/image/riff/riff_test.go
new file mode 100644
index 000000000..567e938d2
--- /dev/null
+++ b/vendor/golang.org/x/image/riff/riff_test.go
@@ -0,0 +1,69 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package riff
+
+import (
+	"bytes"
+	"testing"
+)
+
+func encodeU32(u uint32) []byte {
+	return []byte{
+		byte(u >> 0),
+		byte(u >> 8),
+		byte(u >> 16),
+		byte(u >> 24),
+	}
+}
+
+func TestShortChunks(t *testing.T) {
+	// s is a RIFF(ABCD) with allegedly 256 bytes of data (excluding the
+	// leading 8-byte "RIFF\x00\x01\x00\x00"). The first chunk of that ABCD
+	// list is an abcd chunk of length m followed by n zeroes.
+	for _, m := range []uint32{0, 8, 15, 200, 300} {
+		for _, n := range []int{0, 1, 2, 7} {
+			s := []byte("RIFF\x00\x01\x00\x00ABCDabcd")
+			s = append(s, encodeU32(m)...)
+			s = append(s, make([]byte, n)...)
+			_, r, err := NewReader(bytes.NewReader(s))
+			if err != nil {
+				t.Errorf("m=%d, n=%d: NewReader: %v", m, n, err)
+				continue
+			}
+
+			_, _, _, err0 := r.Next()
+			// The total "ABCD" list length is 256 bytes, of which the first 12
+			// bytes are "ABCDabcd" plus the 4-byte encoding of m. If the
+			// "abcd" subchunk length (m) plus those 12 bytes is greater than
+			// the total list length, we have an invalid RIFF, and we expect an
+			// errListSubchunkTooLong error.
+			if m+12 > 256 {
+				if err0 != errListSubchunkTooLong {
+					t.Errorf("m=%d, n=%d: Next #0: got %v, want %v", m, n, err0, errListSubchunkTooLong)
+				}
+				continue
+			}
+			// Otherwise, we expect a nil error.
+			if err0 != nil {
+				t.Errorf("m=%d, n=%d: Next #0: %v", m, n, err0)
+				continue
+			}
+
+			_, _, _, err1 := r.Next()
+			// If m > 0, then m > n, so that "abcd" subchunk doesn't have m
+			// bytes of data. If m == 0, then that "abcd" subchunk is OK in
+			// that it has 0 extra bytes of data, but the next subchunk (8 byte
+			// header plus body) is missing, as we only have n < 8 more bytes.
+			want := errShortChunkData
+			if m == 0 {
+				want = errShortChunkHeader
+			}
+			if err1 != want {
+				t.Errorf("m=%d, n=%d: Next #1: got %v, want %v", m, n, err1, want)
+				continue
+			}
+		}
+	}
+}