crc sync module.

[ccan] / ccan / crcsync / test / run-roll.c

diff --git a/ccan/crcsync/test/run-roll.c b/ccan/crcsync/test/run-roll.c
new file mode 100644 (file)
index 0000000..106e902
--- /dev/null
+++ b/ccan/crcsync/test/run-roll.c
@@ -0,0 +1,38 @@
+#include "crcsync/crcsync.h"
+#include "crcsync/crcsync.c"
+#include "tap/tap.h"
+#include <stdlib.h>
+#include <stdbool.h>
+
+/* FIXME: ccanize. */
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
+
+static void test_roll(unsigned int wsize)
+{
+       uint8_t data[wsize * 2];
+       uint32_t uncrc_tab[256];
+       unsigned int i;
+
+       init_uncrc_tab(uncrc_tab, wsize);
+
+       for (i = 0; i < ARRAY_SIZE(data); i++)
+               data[i] = random();
+
+       for (i = 1; i < ARRAY_SIZE(data) - wsize; i++) {
+               uint32_t rollcrc, crc;
+
+               crc = crc32c(0, data+i, wsize);
+               rollcrc = crc_roll(crc32c(0, data+i-1, wsize),
+                                  data[i-1], data[i+wsize-1], uncrc_tab);
+
+               ok(crc == rollcrc, "wsize %u, i %u", wsize, i);
+       }
+}
+
+int main(int argc, char *argv[])
+{
+       plan_tests(100 - 1 + 128 - 1);
+       test_roll(100);
+       test_roll(128);
+       return exit_status();
+}