observe padding byte requirement when writing test WAVEs

src/test_streams/main.c

@@ -612,7 +612,8 @@ foo:
 
 static FLAC__bool generate_wav(const char *filename, unsigned sample_rate, unsigned channels, unsigned bytes_per_sample, unsigned samples)
 {
-	const unsigned size = channels * bytes_per_sample * samples;
+	const unsigned true_size = channels * bytes_per_sample * samples;
+	const unsigned padded_size = (true_size + 1) & (~1u);
 	FILE *f;
 	unsigned i;
 
@@ -620,7 +621,7 @@ static FLAC__bool generate_wav(const char *filename, unsigned sample_rate, unsig
 		return false;
 	if(fwrite("RIFF", 1, 4, f) < 4)
 		goto foo;
-	if(!write_little_endian_uint32(f, size + 36))
+	if(!write_little_endian_uint32(f, padded_size + 36))
 		goto foo;
 	if(fwrite("WAVEfmt \020\000\000\000\001\000", 1, 14, f) < 14)
 		goto foo;
@@ -636,12 +637,15 @@ static FLAC__bool generate_wav(const char *filename, unsigned sample_rate, unsig
 		goto foo;
 	if(fwrite("data", 1, 4, f) < 4)
 		goto foo;
-	if(!write_little_endian_uint32(f, size))
+	if(!write_little_endian_uint32(f, true_size))
 		goto foo;
 
-	for(i = 0; i < size; i++)
+	for(i = 0; i < true_size; i++)
 		if(fputc(i, f) == EOF)
 			goto foo;
+	for( ; i < padded_size; i++)
+		if(fputc(0, f) == EOF)
+			goto foo;
 
 	fclose(f);
 	return true;