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// 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
}
}
}
}
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