Repo created

TMessagesProj/jni/voip/webrtc/absl/log/internal/structured_proto.h

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+// Copyright 2024 The Abseil Authors.
+//
+// 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.
+//
+// -----------------------------------------------------------------------------
+// File: log/internal/structured_proto.h
+// -----------------------------------------------------------------------------
+
+#ifndef ABSL_LOG_INTERNAL_STRUCTURED_PROTO_H_
+#define ABSL_LOG_INTERNAL_STRUCTURED_PROTO_H_
+
+#include <cstddef>
+#include <cstdint>
+
+#include "absl/base/config.h"
+#include "absl/log/internal/proto.h"
+#include "absl/types/span.h"
+#include "absl/types/variant.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace log_internal {
+
+// Sum type holding a single valid protobuf field suitable for encoding.
+struct StructuredProtoField final {
+  // Numeric type encoded with varint encoding:
+  // https://protobuf.dev/programming-guides/encoding/#varints
+  using Varint = absl::variant<uint64_t, int64_t, uint32_t, int32_t, bool>;
+
+  // Fixed-length 64-bit integer encoding:
+  // https://protobuf.dev/programming-guides/encoding/#non-varints
+  using I64 = absl::variant<uint64_t, int64_t, double>;
+
+  // Length-delimited record type (string, sub-message):
+  // https://protobuf.dev/programming-guides/encoding/#length-types
+  using LengthDelimited = absl::Span<const char>;
+
+  // Fixed-length 32-bit integer encoding:
+  // https://protobuf.dev/programming-guides/encoding/#non-varints
+  using I32 = absl::variant<uint32_t, int32_t, float>;
+
+  // Valid record type:
+  // https://protobuf.dev/programming-guides/encoding/#structure
+  using Value = absl::variant<Varint, I64, LengthDelimited, I32>;
+
+  // Field number for the protobuf value.
+  uint64_t field_number;
+
+  // Value to encode.
+  Value value;
+};
+
+// Estimates the number of bytes needed to encode `field` using
+// protobuf encoding.
+//
+// The returned value might be larger than the actual number of bytes needed.
+inline size_t BufferSizeForStructuredProtoField(StructuredProtoField field) {
+  // Visitor to estimate the number of bytes of one of the types contained
+  // inside `StructuredProtoField`.
+  struct BufferSizeVisitor final {
+    size_t operator()(StructuredProtoField::Varint /*unused*/) {
+      return BufferSizeFor(field_number, WireType::kVarint);
+    }
+
+    size_t operator()(StructuredProtoField::I64 /*unused*/) {
+      return BufferSizeFor(field_number, WireType::k64Bit);
+    }
+
+    size_t operator()(StructuredProtoField::LengthDelimited length_delimited) {
+      return BufferSizeFor(field_number, WireType::kLengthDelimited) +
+             length_delimited.size();
+    }
+
+    size_t operator()(StructuredProtoField::I32 /*unused*/) {
+      return BufferSizeFor(field_number, WireType::k32Bit);
+    }
+
+    uint64_t field_number;
+  };
+
+  return absl::visit(BufferSizeVisitor{field.field_number}, field.value);
+}
+
+// Encodes `field` into `buf` using protobuf encoding.
+//
+// On success, returns `true` and advances `buf` to the end of
+// the bytes consumed.
+//
+// On failure (if `buf` was too small), returns `false`.
+bool EncodeStructuredProtoField(StructuredProtoField field,
+                                absl::Span<char>& buf);
+
+}  // namespace log_internal
+ABSL_NAMESPACE_END
+}  // namespace absl
+
+#endif  // ABSL_LOG_INTERNAL_STRUCTURED_PROTO_H_