Cleanup the block processor file structure

A cleaner separation between common code, frontend code and backend
code is made.

The "is this byte blob zero" function is moved out to libutil (with
test case and everything) with a more optimized implementation.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 32 insertions, 0 deletions

diff --git a/tests/libutil/is_memory_zero.c b/tests/libutil/is_memory_zero.c
new file mode 100644
index 0000000..20bd93f
--- /dev/null
+++ b/tests/libutil/is_memory_zero.c
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * is_memory_zero.c
+ *
+ * Copyright (C) 2021 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+
+#include "../test.h"
+#include "util.h"
+
+int main(void)
+{
+	unsigned char temp[1024];
+	size_t i, j;
+
+	memset(temp, 0, sizeof(temp));
+
+	for (i = 0; i < sizeof(temp); ++i) {
+		TEST_ASSERT(is_memory_zero(temp, i));
+
+		for (j = 0; j < i; ++j) {
+			TEST_ASSERT(is_memory_zero(temp, i));
+			temp[j] = 42;
+			TEST_ASSERT(!is_memory_zero(temp, i));
+			temp[j] = 0;
+			TEST_ASSERT(is_memory_zero(temp, i));
+		}
+	}
+
+	return EXIT_SUCCESS;
+}