test/core/transport/chttp2/varint_test.c

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#include "src/core/lib/transport/chttp2/varint.h"

#include <grpc/support/log.h>
#include <grpc/support/slice.h>

#include "test/core/util/test_config.h"

static void test_varint(uint32_t value, uint32_t prefix_bits, uint8_t prefix_or,
                        const char *expect_bytes, size_t expect_length) {
  uint32_t nbytes = GRPC_CHTTP2_VARINT_LENGTH(value, prefix_bits);
  gpr_slice expect = gpr_slice_from_copied_buffer(expect_bytes, expect_length);
  gpr_slice slice;
  gpr_log(GPR_DEBUG, "Test: 0x%08x", value);
  GPR_ASSERT(nbytes == expect_length);
  slice = gpr_slice_malloc(nbytes);
  GRPC_CHTTP2_WRITE_VARINT(value, prefix_bits, prefix_or,
                           GPR_SLICE_START_PTR(slice), nbytes);
  GPR_ASSERT(gpr_slice_cmp(expect, slice) == 0);
  gpr_slice_unref(expect);
  gpr_slice_unref(slice);
}

#define TEST_VARINT(value, prefix_bits, prefix_or, expect) \
  test_varint(value, prefix_bits, prefix_or, expect, sizeof(expect) - 1)

int main(int argc, char **argv) {
  grpc_test_init(argc, argv);
  TEST_VARINT(0, 1, 0, "\x00");
  TEST_VARINT(128, 1, 0, "\x7f\x01");
  TEST_VARINT(16384, 1, 0, "\x7f\x81\x7f");
  TEST_VARINT(2097152, 1, 0, "\x7f\x81\xff\x7f");
  TEST_VARINT(268435456, 1, 0, "\x7f\x81\xff\xff\x7f");
  TEST_VARINT(0xffffffff, 1, 0, "\x7f\x80\xff\xff\xff\x0f");
  return 0;
}