1 files changed, 74 insertions, 0 deletions
diff --git a/lib/common/test/istream_mem.c b/lib/common/test/istream_mem.c
new file mode 100644
index 0000000..2213168
--- /dev/null
+++ b/lib/common/test/istream_mem.c
@@ -0,0 +1,74 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * istream_mem.c
+ *
+ * Copyright (C) 2023 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+
+#include "util/test.h"
+#include "sqfs/io.h"
+#include "common.h"
+
+static const size_t end0 = 449;	/* region 1: filled with 'A' */
+static const size_t end1 = 521;	/* region 2: filled with 'B' */
+static const size_t end2 = 941;	/* region 3: filled with 'C' */
+
+static unsigned char data[941];
+
+static unsigned char byte_at_offset(size_t off)
+{
+	if (off < end0)
+		return 'A';
+	if (off < end1)
+		return 'B';
+	return 'C';
+}
+
+static void init_buffer(void)
+{
+	for (size_t i = 0; i < end2; ++i)
+		data[i] = byte_at_offset(i);
+}
+
+int main(int argc, char **argv)
+{
+	size_t i, diff, size;
+	bool eat_all = true;
+	const sqfs_u8 *ptr;
+	sqfs_istream_t *in;
+	int ret;
+	(void)argc; (void)argv;
+
+	init_buffer();
+
+	in = istream_memory_create("memstream.txt", 61, data, sizeof(data));
+	TEST_NOT_NULL(in);
+	TEST_EQUAL_UI(((sqfs_object_t *)in)->refcount, 1);
+
+	TEST_STR_EQUAL(in->get_filename(in), "memstream.txt");
+
+	for (i = 0; i < end2; i += diff) {
+		ret = in->get_buffered_data(in, &ptr, &size, 61);
+		TEST_EQUAL_I(ret, 0);
+
+		if ((end2 - i) >= 61) {
+			TEST_NOT_NULL(ptr);
+			TEST_EQUAL_UI(size, 61);
+		} else {
+			TEST_NOT_NULL(ptr);
+			TEST_EQUAL_UI(size, (end2 - i));
+		}
+
+		for (size_t j = 0; j < size; ++j) {
+			TEST_EQUAL_UI(ptr[j], byte_at_offset(i + j));
+		}
+
+		diff = eat_all ? size : (size / 2);
+		eat_all = !eat_all;
+		in->advance_buffer(in, diff);
+	}
+
+	sqfs_drop(in);
+	return EXIT_SUCCESS;
+}