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-rw-r--r--lib/test_hexdump.c238
1 files changed, 238 insertions, 0 deletions
diff --git a/lib/test_hexdump.c b/lib/test_hexdump.c
new file mode 100644
index 000000000000..3f415d8101f3
--- /dev/null
+++ b/lib/test_hexdump.c
@@ -0,0 +1,238 @@
+/*
+ * Test cases for lib/hexdump.c module.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/random.h>
+#include <linux/string.h>
+
+static const unsigned char data_b[] = {
+ '\xbe', '\x32', '\xdb', '\x7b', '\x0a', '\x18', '\x93', '\xb2', /* 00 - 07 */
+ '\x70', '\xba', '\xc4', '\x24', '\x7d', '\x83', '\x34', '\x9b', /* 08 - 0f */
+ '\xa6', '\x9c', '\x31', '\xad', '\x9c', '\x0f', '\xac', '\xe9', /* 10 - 17 */
+ '\x4c', '\xd1', '\x19', '\x99', '\x43', '\xb1', '\xaf', '\x0c', /* 18 - 1f */
+};
+
+static const unsigned char data_a[] = ".2.{....p..$}.4...1.....L...C...";
+
+static const char * const test_data_1_le[] __initconst = {
+ "be", "32", "db", "7b", "0a", "18", "93", "b2",
+ "70", "ba", "c4", "24", "7d", "83", "34", "9b",
+ "a6", "9c", "31", "ad", "9c", "0f", "ac", "e9",
+ "4c", "d1", "19", "99", "43", "b1", "af", "0c",
+};
+
+static const char * const test_data_2_le[] __initconst = {
+ "32be", "7bdb", "180a", "b293",
+ "ba70", "24c4", "837d", "9b34",
+ "9ca6", "ad31", "0f9c", "e9ac",
+ "d14c", "9919", "b143", "0caf",
+};
+
+static const char * const test_data_4_le[] __initconst = {
+ "7bdb32be", "b293180a", "24c4ba70", "9b34837d",
+ "ad319ca6", "e9ac0f9c", "9919d14c", "0cafb143",
+};
+
+static const char * const test_data_8_le[] __initconst = {
+ "b293180a7bdb32be", "9b34837d24c4ba70",
+ "e9ac0f9cad319ca6", "0cafb1439919d14c",
+};
+
+#define FILL_CHAR '#'
+
+static unsigned total_tests __initdata;
+static unsigned failed_tests __initdata;
+
+static void __init test_hexdump_prepare_test(size_t len, int rowsize,
+ int groupsize, char *test,
+ size_t testlen, bool ascii)
+{
+ char *p;
+ const char * const *result;
+ size_t l = len;
+ int gs = groupsize, rs = rowsize;
+ unsigned int i;
+
+ if (rs != 16 && rs != 32)
+ rs = 16;
+
+ if (l > rs)
+ l = rs;
+
+ if (!is_power_of_2(gs) || gs > 8 || (len % gs != 0))
+ gs = 1;
+
+ if (gs == 8)
+ result = test_data_8_le;
+ else if (gs == 4)
+ result = test_data_4_le;
+ else if (gs == 2)
+ result = test_data_2_le;
+ else
+ result = test_data_1_le;
+
+ /* hex dump */
+ p = test;
+ for (i = 0; i < l / gs; i++) {
+ const char *q = *result++;
+ size_t amount = strlen(q);
+
+ strncpy(p, q, amount);
+ p += amount;
+
+ *p++ = ' ';
+ }
+ if (i)
+ p--;
+
+ /* ASCII part */
+ if (ascii) {
+ do {
+ *p++ = ' ';
+ } while (p < test + rs * 2 + rs / gs + 1);
+
+ strncpy(p, data_a, l);
+ p += l;
+ }
+
+ *p = '\0';
+}
+
+#define TEST_HEXDUMP_BUF_SIZE (32 * 3 + 2 + 32 + 1)
+
+static void __init test_hexdump(size_t len, int rowsize, int groupsize,
+ bool ascii)
+{
+ char test[TEST_HEXDUMP_BUF_SIZE];
+ char real[TEST_HEXDUMP_BUF_SIZE];
+
+ total_tests++;
+
+ memset(real, FILL_CHAR, sizeof(real));
+ hex_dump_to_buffer(data_b, len, rowsize, groupsize, real, sizeof(real),
+ ascii);
+
+ memset(test, FILL_CHAR, sizeof(test));
+ test_hexdump_prepare_test(len, rowsize, groupsize, test, sizeof(test),
+ ascii);
+
+ if (memcmp(test, real, TEST_HEXDUMP_BUF_SIZE)) {
+ pr_err("Len: %zu row: %d group: %d\n", len, rowsize, groupsize);
+ pr_err("Result: '%s'\n", real);
+ pr_err("Expect: '%s'\n", test);
+ failed_tests++;
+ }
+}
+
+static void __init test_hexdump_set(int rowsize, bool ascii)
+{
+ size_t d = min_t(size_t, sizeof(data_b), rowsize);
+ size_t len = get_random_int() % d + 1;
+
+ test_hexdump(len, rowsize, 4, ascii);
+ test_hexdump(len, rowsize, 2, ascii);
+ test_hexdump(len, rowsize, 8, ascii);
+ test_hexdump(len, rowsize, 1, ascii);
+}
+
+static void __init test_hexdump_overflow(size_t buflen, size_t len,
+ int rowsize, int groupsize,
+ bool ascii)
+{
+ char test[TEST_HEXDUMP_BUF_SIZE];
+ char buf[TEST_HEXDUMP_BUF_SIZE];
+ int rs = rowsize, gs = groupsize;
+ int ae, he, e, f, r;
+ bool a;
+
+ total_tests++;
+
+ memset(buf, FILL_CHAR, sizeof(buf));
+
+ r = hex_dump_to_buffer(data_b, len, rs, gs, buf, buflen, ascii);
+
+ /*
+ * Caller must provide the data length multiple of groupsize. The
+ * calculations below are made with that assumption in mind.
+ */
+ ae = rs * 2 /* hex */ + rs / gs /* spaces */ + 1 /* space */ + len /* ascii */;
+ he = (gs * 2 /* hex */ + 1 /* space */) * len / gs - 1 /* no trailing space */;
+
+ if (ascii)
+ e = ae;
+ else
+ e = he;
+
+ f = min_t(int, e + 1, buflen);
+ if (buflen) {
+ test_hexdump_prepare_test(len, rs, gs, test, sizeof(test), ascii);
+ test[f - 1] = '\0';
+ }
+ memset(test + f, FILL_CHAR, sizeof(test) - f);
+
+ a = r == e && !memcmp(test, buf, TEST_HEXDUMP_BUF_SIZE);
+
+ buf[sizeof(buf) - 1] = '\0';
+
+ if (!a) {
+ pr_err("Len: %zu buflen: %zu strlen: %zu\n",
+ len, buflen, strnlen(buf, sizeof(buf)));
+ pr_err("Result: %d '%s'\n", r, buf);
+ pr_err("Expect: %d '%s'\n", e, test);
+ failed_tests++;
+ }
+}
+
+static void __init test_hexdump_overflow_set(size_t buflen, bool ascii)
+{
+ unsigned int i = 0;
+ int rs = (get_random_int() % 2 + 1) * 16;
+
+ do {
+ int gs = 1 << i;
+ size_t len = get_random_int() % rs + gs;
+
+ test_hexdump_overflow(buflen, rounddown(len, gs), rs, gs, ascii);
+ } while (i++ < 3);
+}
+
+static int __init test_hexdump_init(void)
+{
+ unsigned int i;
+ int rowsize;
+
+ rowsize = (get_random_int() % 2 + 1) * 16;
+ for (i = 0; i < 16; i++)
+ test_hexdump_set(rowsize, false);
+
+ rowsize = (get_random_int() % 2 + 1) * 16;
+ for (i = 0; i < 16; i++)
+ test_hexdump_set(rowsize, true);
+
+ for (i = 0; i <= TEST_HEXDUMP_BUF_SIZE; i++)
+ test_hexdump_overflow_set(i, false);
+
+ for (i = 0; i <= TEST_HEXDUMP_BUF_SIZE; i++)
+ test_hexdump_overflow_set(i, true);
+
+ if (failed_tests == 0)
+ pr_info("all %u tests passed\n", total_tests);
+ else
+ pr_err("failed %u out of %u tests\n", failed_tests, total_tests);
+
+ return failed_tests ? -EINVAL : 0;
+}
+module_init(test_hexdump_init);
+
+static void __exit test_hexdump_exit(void)
+{
+ /* do nothing */
+}
+module_exit(test_hexdump_exit);
+
+MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
+MODULE_LICENSE("Dual BSD/GPL");