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crc32c_test.cc

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+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <string.h>
+
+#include <iostream>
+#include <random>
+
+#include "crc32c.h"
+
+extern "C" {
+uint32_t crc32c_hw(const char *, size_t);
+uint32_t crc32c_sw(const char *, size_t);
+}
+
+const int MINSIZE = 1;
+const int MAXSIZE = 1048576;
+
+int main(int argc, char **argv) {
+#if defined(__x86_64__) || defined(__i386__)
+  std::knuth_b rndeng((std::random_device()()));
+  std::uniform_int_distribution<int> size_dist(MINSIZE, MAXSIZE);
+  std::uniform_int_distribution<int> d_dist(0, 255);
+  std::string buf;
+  for (int i = 0; i < 100; i++) {
+    size_t len = size_dist(rndeng);
+    buf.resize(len);
+    for (size_t j = 0; j < len; j++) {
+      buf[j] = d_dist(rndeng);
+    }
+    uint32_t crc_hw = crc32c_hw(buf.data(), len);
+    uint32_t crc_sw = crc32c_sw(buf.data(), len);
+    if (crc_hw != crc_sw) {
+      fprintf(stderr, "crc mismatch: hw 0x%08x vs sw 0x%08x buffer len %ld\n",
+              crc_hw, crc_sw, len);
+    }
+    buf.clear();
+  }
+#endif  // defined(__x86_64__) || defined(__i386__)
+  return 0;
+}