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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef QUICHE_QUIC_PLATFORM_API_QUIC_MEM_SLICE_SPAN_H_
#define QUICHE_QUIC_PLATFORM_API_QUIC_MEM_SLICE_SPAN_H_
#include "absl/strings/string_view.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_export.h"
#include "net/quic/platform/impl/quic_mem_slice_span_impl.h"
namespace quic {
// QuicMemSliceSpan is effectively wrapper around an array of data structures
// used as QuicMemSlice. So it could implemented with:
// QuicMemSlice* slices_;
// size_t num_slices_;
// But for efficiency reasons, the actual implementation is an array of
// platform-specific objects. This could avoid the translation from
// platform-specific object to QuicMemSlice.
// QuicMemSliceSpan does not own the underling data buffers.
class QUIC_EXPORT_PRIVATE QuicMemSliceSpan {
public:
explicit QuicMemSliceSpan(QuicMemSliceSpanImpl impl) : impl_(impl) {}
// Constructs a span with a single QuicMemSlice.
explicit QuicMemSliceSpan(QuicMemSlice* slice) : impl_(slice->impl()) {}
QuicMemSliceSpan(const QuicMemSliceSpan& other) = default;
QuicMemSliceSpan& operator=(const QuicMemSliceSpan& other) = default;
QuicMemSliceSpan(QuicMemSliceSpan&& other) = default;
QuicMemSliceSpan& operator=(QuicMemSliceSpan&& other) = default;
~QuicMemSliceSpan() = default;
template <typename ConsumeFunction>
QuicByteCount ConsumeAll(ConsumeFunction consume) {
return impl_.ConsumeAll(consume);
}
// Return data of the span at |index| by the form of a
// absl::string_view.
absl::string_view GetData(int index) { return impl_.GetData(index); }
// Return the total length of the data inside the span.
QuicByteCount total_length() { return impl_.total_length(); }
// Return total number of slices in the span.
size_t NumSlices() { return impl_.NumSlices(); }
bool empty() const { return impl_.empty(); }
private:
QuicMemSliceSpanImpl impl_;
};
} // namespace quic
#endif // QUICHE_QUIC_PLATFORM_API_QUIC_MEM_SLICE_SPAN_H_
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