Sync with upstream repo.

Changes include:
* CPU check has been broken up into a number of small libraries
* BoringSSL option has been removed
* Better abseil integration

compressor.cc

@@ -0,0 +1,56 @@
+// 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 "compressor.h"
+
+#include "absl/status/status.h"
+#include "absl/strings/str_format.h"
+#include <zlib.h>
+
+namespace cpu_check {
+
+absl::Status Zlib::Compress(const MalignBuffer &m,
+                            MalignBuffer *compressed) const {
+  uLongf olen = compressBound(m.size());
+  compressed->resize(olen);
+  int err = compress2(reinterpret_cast<Bytef *>(compressed->data()), &olen,
+                      reinterpret_cast<const Bytef *>(m.data()), m.size(),
+                      Z_BEST_SPEED);
+  if (err != Z_OK) {
+    return absl::Status(
+        absl::StatusCode::kInternal,
+        absl::StrFormat("Zlib compression failed: %d srcLen: %d destLen: %d",
+                        err, m.size(), olen));
+  }
+  compressed->resize(olen);
+  return absl::OkStatus();
+}
+
+absl::Status Zlib::Decompress(const MalignBuffer &compressed,
+                              MalignBuffer *m) const {
+  uLongf olen = m->size();
+  int err = uncompress(reinterpret_cast<Bytef *>(m->data()), &olen,
+                       reinterpret_cast<const Bytef *>(compressed.data()),
+                       compressed.size());
+  if (err != Z_OK) {
+    return absl::Status(
+        absl::StatusCode::kInternal,
+        absl::StrFormat("Zlib decompression failed: %d srcLen: %d destLen: %d",
+                        err, compressed.size(), olen));
+  }
+  m->resize(olen);
+  return absl::OkStatus();
+}
+
+};  // namespace cpu_check