--- /dev/null
+#include <assert.h>
+#include <oer_support.c>
+
+static char buffer[128];
+
+static int fill_buffer(const void *data, size_t size, void *app_key) {
+ size_t *offset = (size_t *)app_key;
+ assert(*offset + size < sizeof(buffer));
+ memcpy(&buffer[*offset], data, size);
+ *offset += size;
+ return 0;
+}
+
+#define CHECK(a, b) check_round_trip(__LINE__, a, b)
+
+static void
+check_round_trip(int lineno, int ok, size_t length) {
+ fprintf(stderr, "%03d: Round-trip for %zu\n", lineno, length);
+
+ /* Serialize */
+ size_t enc_len = 0;
+ ssize_t enc_len_len = oer_serialize_length(length, fill_buffer, &enc_len);
+ assert(enc_len_len > 0);
+ assert(enc_len == (size_t)enc_len_len);
+
+ /* Deserialize */
+ size_t recovered_length = 0;
+ for(size_t part = 0; part < enc_len; part++) {
+ size_t ret = oer_fetch_length(buffer, part, &recovered_length);
+ assert(ret == 0); /* More data expected. */
+ }
+ ssize_t dec_len = oer_fetch_length(buffer, enc_len, &recovered_length);
+ if(ok) {
+ assert(dec_len > 0);
+ assert((size_t)dec_len == enc_len);
+ if(recovered_length != length) {
+ fprintf(stderr,
+ "Round-trip failed %zu->%zu (encoded %zd, decoded %zd)\n",
+ length, recovered_length, enc_len, dec_len);
+ assert(recovered_length == length);
+ }
+ } else {
+ assert(dec_len == -1);
+ }
+}
+
+int main() {
+ int bits64 = sizeof(size_t) > 4;
+
+ CHECK(1, 0);
+ CHECK(1, 1);
+ CHECK(1, 127);
+ CHECK(1, 128);
+ CHECK(1, 129);
+ CHECK(1, 255);
+ CHECK(1, 256);
+ CHECK(1, 65534);
+ CHECK(1, 65535);
+ CHECK(1, 65536);
+ CHECK(1, 65538);
+ CHECK(1, 16000000);
+ CHECK(1, 16777216);
+ CHECK(bits64, 2147483648);
+ CHECK(bits64, 4294967295UL);
+
+}
+