nearby sdk refactor

PiperOrigin-RevId: 425434260

internal/platform/input_stream.cc

@@ -0,0 +1,44 @@
+// 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
+//
+//     https://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 "internal/platform/input_stream.h"
+
+#include <algorithm>
+#include <cstddef>
+#include <cstdint>
+
+#include "internal/platform/byte_array.h"
+#include "internal/platform/exception.h"
+
+namespace location {
+namespace nearby {
+namespace {
+constexpr size_t kSkipBufferSize = 64 * 1024;
+}  // namespace
+
+ExceptionOr<size_t> InputStream::Skip(size_t offset) {
+  size_t bytes_left = offset;
+  while (bytes_left > 0) {
+    size_t chunk_size = std::min(bytes_left, kSkipBufferSize);
+    ExceptionOr<ByteArray> result = Read(chunk_size);
+    if (!result.ok()) {
+      return result.GetException();
+    }
+    bytes_left -= chunk_size;
+  }
+  return ExceptionOr<size_t>(offset);
+}
+
+}  // namespace nearby
+}  // namespace location