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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Author: kenton@google.com (Kenton Varda)
//         wink@google.com (Wink Saville) (refactored from wire_format.h)
//  Based on original Protocol Buffers design by
//  Sanjay Ghemawat, Jeff Dean, and others.

#ifndef GOOGLE_PROTOBUF_WIRE_FORMAT_LITE_INL_H__
#define GOOGLE_PROTOBUF_WIRE_FORMAT_LITE_INL_H__

#include <algorithm>
#include <string>
#include <google/protobuf/stubs/common.h>
#include <google/protobuf/stubs/logging.h>
#include <google/protobuf/message_lite.h>
#include <google/protobuf/repeated_field.h>
#include <google/protobuf/wire_format_lite.h>
#include <google/protobuf/io/coded_stream.h>
#include <google/protobuf/arenastring.h>


namespace google {
namespace protobuf {
namespace internal {

// Implementation details of ReadPrimitive.

template <>
inline bool WireFormatLite::ReadPrimitive<int32, WireFormatLite::TYPE_INT32>(
    io::CodedInputStream* input,
    int32* value) {
  uint32 temp;
  if (!input->ReadVarint32(&temp)) return false;
  *value = static_cast<int32>(temp);
  return true;
}
template <>
inline bool WireFormatLite::ReadPrimitive<int64, WireFormatLite::TYPE_INT64>(
    io::CodedInputStream* input,
    int64* value) {
  uint64 temp;
  if (!input->ReadVarint64(&temp)) return false;
  *value = static_cast<int64>(temp);
  return true;
}
template <>
inline bool WireFormatLite::ReadPrimitive<uint32, WireFormatLite::TYPE_UINT32>(
    io::CodedInputStream* input,
    uint32* value) {
  return input->ReadVarint32(value);
}
template <>
inline bool WireFormatLite::ReadPrimitive<uint64, WireFormatLite::TYPE_UINT64>(
    io::CodedInputStream* input,
    uint64* value) {
  return input->ReadVarint64(value);
}
template <>
inline bool WireFormatLite::ReadPrimitive<int32, WireFormatLite::TYPE_SINT32>(
    io::CodedInputStream* input,
    int32* value) {
  uint32 temp;
  if (!input->ReadVarint32(&temp)) return false;
  *value = ZigZagDecode32(temp);
  return true;
}
template <>
inline bool WireFormatLite::ReadPrimitive<int64, WireFormatLite::TYPE_SINT64>(
    io::CodedInputStream* input,
    int64* value) {
  uint64 temp;
  if (!input->ReadVarint64(&temp)) return false;
  *value = ZigZagDecode64(temp);
  return true;
}
template <>
inline bool WireFormatLite::ReadPrimitive<uint32, WireFormatLite::TYPE_FIXED32>(
    io::CodedInputStream* input,
    uint32* value) {
  return input->ReadLittleEndian32(value);
}
template <>
inline bool WireFormatLite::ReadPrimitive<uint64, WireFormatLite::TYPE_FIXED64>(
    io::CodedInputStream* input,
    uint64* value) {
  return input->ReadLittleEndian64(value);
}
template <>
inline bool WireFormatLite::ReadPrimitive<int32, WireFormatLite::TYPE_SFIXED32>(
    io::CodedInputStream* input,
    int32* value) {
  uint32 temp;
  if (!input->ReadLittleEndian32(&temp)) return false;
  *value = static_cast<int32>(temp);
  return true;
}
template <>
inline bool WireFormatLite::ReadPrimitive<int64, WireFormatLite::TYPE_SFIXED64>(
    io::CodedInputStream* input,
    int64* value) {
  uint64 temp;
  if (!input->ReadLittleEndian64(&temp)) return false;
  *value = static_cast<int64>(temp);
  return true;
}
template <>
inline bool WireFormatLite::ReadPrimitive<float, WireFormatLite::TYPE_FLOAT>(
    io::CodedInputStream* input,
    float* value) {
  uint32 temp;
  if (!input->ReadLittleEndian32(&temp)) return false;
  *value = DecodeFloat(temp);
  return true;
}
template <>
inline bool WireFormatLite::ReadPrimitive<double, WireFormatLite::TYPE_DOUBLE>(
    io::CodedInputStream* input,
    double* value) {
  uint64 temp;
  if (!input->ReadLittleEndian64(&temp)) return false;
  *value = DecodeDouble(temp);
  return true;
}
template <>
inline bool WireFormatLite::ReadPrimitive<bool, WireFormatLite::TYPE_BOOL>(
    io::CodedInputStream* input,
    bool* value) {
  uint64 temp;
  if (!input->ReadVarint64(&temp)) return false;
  *value = temp != 0;
  return true;
}
template <>
inline bool WireFormatLite::ReadPrimitive<int, WireFormatLite::TYPE_ENUM>(
    io::CodedInputStream* input,
    int* value) {
  uint32 temp;
  if (!input->ReadVarint32(&temp)) return false;
  *value = static_cast<int>(temp);
  return true;
}

template <>
inline const uint8* WireFormatLite::ReadPrimitiveFromArray<
  uint32, WireFormatLite::TYPE_FIXED32>(
    const uint8* buffer,
    uint32* value) {
  return io::CodedInputStream::ReadLittleEndian32FromArray(buffer, value);
}
template <>
inline const uint8* WireFormatLite::ReadPrimitiveFromArray<
  uint64, WireFormatLite::TYPE_FIXED64>(
    const uint8* buffer,
    uint64* value) {
  return io::CodedInputStream::ReadLittleEndian64FromArray(buffer, value);
}
template <>
inline const uint8* WireFormatLite::ReadPrimitiveFromArray<
  int32, WireFormatLite::TYPE_SFIXED32>(
    const uint8* buffer,
    int32* value) {
  uint32 temp;
  buffer = io::CodedInputStream::ReadLittleEndian32FromArray(buffer, &temp);
  *value = static_cast<int32>(temp);
  return buffer;
}
template <>
inline const uint8* WireFormatLite::ReadPrimitiveFromArray<
  int64, WireFormatLite::TYPE_SFIXED64>(
    const uint8* buffer,
    int64* value) {
  uint64 temp;
  buffer = io::CodedInputStream::ReadLittleEndian64FromArray(buffer, &temp);
  *value = static_cast<int64>(temp);
  return buffer;
}
template <>
inline const uint8* WireFormatLite::ReadPrimitiveFromArray<
  float, WireFormatLite::TYPE_FLOAT>(
    const uint8* buffer,
    float* value) {
  uint32 temp;
  buffer = io::CodedInputStream::ReadLittleEndian32FromArray(buffer, &temp);
  *value = DecodeFloat(temp);
  return buffer;
}
template <>
inline const uint8* WireFormatLite::ReadPrimitiveFromArray<
  double, WireFormatLite::TYPE_DOUBLE>(
    const uint8* buffer,
    double* value) {
  uint64 temp;
  buffer = io::CodedInputStream::ReadLittleEndian64FromArray(buffer, &temp);
  *value = DecodeDouble(temp);
  return buffer;
}

template <typename CType, enum WireFormatLite::FieldType DeclaredType>
inline bool WireFormatLite::ReadRepeatedPrimitive(
    int,  // tag_size, unused.
    uint32 tag,
    io::CodedInputStream* input,
    RepeatedField<CType>* values) {
  CType value;
  if (!ReadPrimitive<CType, DeclaredType>(input, &value)) return false;
  values->Add(value);
  int elements_already_reserved = values->Capacity() - values->size();
  while (elements_already_reserved > 0 && input->ExpectTag(tag)) {
    if (!ReadPrimitive<CType, DeclaredType>(input, &value)) return false;
    values->AddAlreadyReserved(value);
    elements_already_reserved--;
  }
  return true;
}

template <typename CType, enum WireFormatLite::FieldType DeclaredType>
inline bool WireFormatLite::ReadRepeatedFixedSizePrimitive(
    int tag_size,
    uint32 tag,
    io::CodedInputStream* input,
    RepeatedField<CType>* values) {
  GOOGLE_DCHECK_EQ(UInt32Size(tag), static_cast<size_t>(tag_size));
  CType value;
  if (!ReadPrimitive<CType, DeclaredType>(input, &value))
    return false;
  values->Add(value);

  // For fixed size values, repeated values can be read more quickly by
  // reading directly from a raw array.
  //
  // We can get a tight loop by only reading as many elements as can be
  // added to the RepeatedField without having to do any resizing. Additionally,
  // we only try to read as many elements as are available from the current
  // buffer space. Doing so avoids having to perform boundary checks when
  // reading the value: the maximum number of elements that can be read is
  // known outside of the loop.
  const void* void_pointer;
  int size;
  input->GetDirectBufferPointerInline(&void_pointer, &size);
  if (size > 0) {
    const uint8* buffer = reinterpret_cast<const uint8*>(void_pointer);
    // The number of bytes each type occupies on the wire.
    const int per_value_size = tag_size + static_cast<int>(sizeof(value));

    // parentheses around (std::min) prevents macro expansion of min(...)
    int elements_available =
        (std::min)(values->Capacity() - values->size(), size / per_value_size);
    int num_read = 0;
    while (num_read < elements_available &&
           (buffer = io::CodedInputStream::ExpectTagFromArray(
               buffer, tag)) != NULL) {
      buffer = ReadPrimitiveFromArray<CType, DeclaredType>(buffer, &value);
      values->AddAlreadyReserved(value);
      ++num_read;
    }
    const int read_bytes = num_read * per_value_size;
    if (read_bytes > 0) {
      input->Skip(read_bytes);
    }
  }
  return true;
}

// Specializations of ReadRepeatedPrimitive for the fixed size types, which use
// the optimized code path.
#define READ_REPEATED_FIXED_SIZE_PRIMITIVE(CPPTYPE, DECLARED_TYPE)             \
template <>                                                                    \
inline bool WireFormatLite::ReadRepeatedPrimitive<                             \
  CPPTYPE, WireFormatLite::DECLARED_TYPE>(                                     \
    int tag_size,                                                              \
    uint32 tag,                                                                \
    io::CodedInputStream* input,                                               \
    RepeatedField<CPPTYPE>* values) {                                          \
  return ReadRepeatedFixedSizePrimitive<                                       \
    CPPTYPE, WireFormatLite::DECLARED_TYPE>(                                   \
      tag_size, tag, input, values);                                           \
}

READ_REPEATED_FIXED_SIZE_PRIMITIVE(uint32, TYPE_FIXED32)
READ_REPEATED_FIXED_SIZE_PRIMITIVE(uint64, TYPE_FIXED64)
READ_REPEATED_FIXED_SIZE_PRIMITIVE(int32, TYPE_SFIXED32)
READ_REPEATED_FIXED_SIZE_PRIMITIVE(int64, TYPE_SFIXED64)
READ_REPEATED_FIXED_SIZE_PRIMITIVE(float, TYPE_FLOAT)
READ_REPEATED_FIXED_SIZE_PRIMITIVE(double, TYPE_DOUBLE)

#undef READ_REPEATED_FIXED_SIZE_PRIMITIVE

template <typename CType, enum WireFormatLite::FieldType DeclaredType>
bool WireFormatLite::ReadRepeatedPrimitiveNoInline(
    int tag_size,
    uint32 tag,
    io::CodedInputStream* input,
    RepeatedField<CType>* value) {
  return ReadRepeatedPrimitive<CType, DeclaredType>(
      tag_size, tag, input, value);
}

template <typename CType, enum WireFormatLite::FieldType DeclaredType>
inline bool WireFormatLite::ReadPackedPrimitive(io::CodedInputStream* input,
                                                RepeatedField<CType>* values) {
  int length;
  if (!input->ReadVarintSizeAsInt(&length)) return false;
  io::CodedInputStream::Limit limit = input->PushLimit(length);
  while (input->BytesUntilLimit() > 0) {
    CType value;
    if (!ReadPrimitive<CType, DeclaredType>(input, &value)) return false;
    values->Add(value);
  }
  input->PopLimit(limit);
  return true;
}

template <typename CType, enum WireFormatLite::FieldType DeclaredType>
inline bool WireFormatLite::ReadPackedFixedSizePrimitive(
    io::CodedInputStream* input, RepeatedField<CType>* values) {
  int length;
  if (!input->ReadVarintSizeAsInt(&length)) return false;
  const int old_entries = values->size();
  const int new_entries = length / static_cast<int>(sizeof(CType));
  const int new_bytes = new_entries * static_cast<int>(sizeof(CType));
  if (new_bytes != length) return false;
  // We would *like* to pre-allocate the buffer to write into (for
  // speed), but *must* avoid performing a very large allocation due
  // to a malicious user-supplied "length" above.  So we have a fast
  // path that pre-allocates when the "length" is less than a bound.
  // We determine the bound by calling BytesUntilTotalBytesLimit() and
  // BytesUntilLimit().  These return -1 to mean "no limit set".
  // There are four cases:
  // TotalBytesLimit  Limit
  // -1               -1     Use slow path.
  // -1               >= 0   Use fast path if length <= Limit.
  // >= 0             -1     Use slow path.
  // >= 0             >= 0   Use fast path if length <= min(both limits).
  int64 bytes_limit = input->BytesUntilTotalBytesLimit();
  if (bytes_limit == -1) {
    bytes_limit = input->BytesUntilLimit();
  } else {
    // parentheses around (std::min) prevents macro expansion of min(...)
    bytes_limit =
        (std::min)(bytes_limit, static_cast<int64>(input->BytesUntilLimit()));
  }
  if (bytes_limit >= new_bytes) {
    // Fast-path that pre-allocates *values to the final size.
#if defined(PROTOBUF_LITTLE_ENDIAN)
    values->Resize(old_entries + new_entries, 0);
    // values->mutable_data() may change after Resize(), so do this after:
    void* dest = reinterpret_cast<void*>(values->mutable_data() + old_entries);
    if (!input->ReadRaw(dest, new_bytes)) {
      values->Truncate(old_entries);
      return false;
    }
#else
    values->Reserve(old_entries + new_entries);
    CType value;
    for (int i = 0; i < new_entries; ++i) {
      if (!ReadPrimitive<CType, DeclaredType>(input, &value)) return false;
      values->AddAlreadyReserved(value);
    }
#endif
  } else {
    // This is the slow-path case where "length" may be too large to
    // safely allocate.  We read as much as we can into *values
    // without pre-allocating "length" bytes.
    CType value;
    for (int i = 0; i < new_entries; ++i) {
      if (!ReadPrimitive<CType, DeclaredType>(input, &value)) return false;
      values->Add(value);
    }
  }
  return true;
}

// Specializations of ReadPackedPrimitive for the fixed size types, which use
// an optimized code path.
#define READ_REPEATED_PACKED_FIXED_SIZE_PRIMITIVE(CPPTYPE, DECLARED_TYPE)      \
template <>                                                                    \
inline bool WireFormatLite::ReadPackedPrimitive<                               \
  CPPTYPE, WireFormatLite::DECLARED_TYPE>(                                     \
    io::CodedInputStream* input,                                               \
    RepeatedField<CPPTYPE>* values) {                                          \
  return ReadPackedFixedSizePrimitive<                                         \
      CPPTYPE, WireFormatLite::DECLARED_TYPE>(input, values);                  \
}

READ_REPEATED_PACKED_FIXED_SIZE_PRIMITIVE(uint32, TYPE_FIXED32)
READ_REPEATED_PACKED_FIXED_SIZE_PRIMITIVE(uint64, TYPE_FIXED64)
READ_REPEATED_PACKED_FIXED_SIZE_PRIMITIVE(int32, TYPE_SFIXED32)
READ_REPEATED_PACKED_FIXED_SIZE_PRIMITIVE(int64, TYPE_SFIXED64)
READ_REPEATED_PACKED_FIXED_SIZE_PRIMITIVE(float, TYPE_FLOAT)
READ_REPEATED_PACKED_FIXED_SIZE_PRIMITIVE(double, TYPE_DOUBLE)

#undef READ_REPEATED_PACKED_FIXED_SIZE_PRIMITIVE

template <typename CType, enum WireFormatLite::FieldType DeclaredType>
bool WireFormatLite::ReadPackedPrimitiveNoInline(io::CodedInputStream* input,
                                                 RepeatedField<CType>* values) {
  return ReadPackedPrimitive<CType, DeclaredType>(input, values);
}



inline bool WireFormatLite::ReadGroup(int field_number,
                                      io::CodedInputStream* input,
                                      MessageLite* value) {
  if (!input->IncrementRecursionDepth()) return false;
  if (!value->MergePartialFromCodedStream(input)) return false;
  input->DecrementRecursionDepth();
  // Make sure the last thing read was an end tag for this group.
  if (!input->LastTagWas(MakeTag(field_number, WIRETYPE_END_GROUP))) {
    return false;
  }
  return true;
}
inline bool WireFormatLite::ReadMessage(io::CodedInputStream* input,
                                        MessageLite* value) {
  int length;
  if (!input->ReadVarintSizeAsInt(&length)) return false;
  std::pair<io::CodedInputStream::Limit, int> p =
      input->IncrementRecursionDepthAndPushLimit(length);
  if (p.second < 0 || !value->MergePartialFromCodedStream(input)) return false;
  // Make sure that parsing stopped when the limit was hit, not at an endgroup
  // tag.
 return input->DecrementRecursionDepthAndPopLimit(p.first);
}

// We name the template parameter something long and extremely unlikely to occur
// elsewhere because a *qualified* member access expression designed to avoid
// virtual dispatch, C++03 [basic.lookup.classref] 3.4.5/4 requires that the
// name of the qualifying class to be looked up both in the context of the full
// expression (finding the template parameter) and in the context of the object
// whose member we are accessing. This could potentially find a nested type
// within that object. The standard goes on to require these names to refer to
// the same entity, which this collision would violate. The lack of a safe way
// to avoid this collision appears to be a defect in the standard, but until it
// is corrected, we choose the name to avoid accidental collisions.
template<typename MessageType_WorkAroundCppLookupDefect>
inline bool WireFormatLite::ReadGroupNoVirtual(
    int field_number, io::CodedInputStream* input,
    MessageType_WorkAroundCppLookupDefect* value) {
  if (!input->IncrementRecursionDepth()) return false;
  if (!value->
      MessageType_WorkAroundCppLookupDefect::MergePartialFromCodedStream(input))
    return false;
  input->UnsafeDecrementRecursionDepth();
  // Make sure the last thing read was an end tag for this group.
  if (!input->LastTagWas(MakeTag(field_number, WIRETYPE_END_GROUP))) {
    return false;
  }
  return true;
}
template<typename MessageType_WorkAroundCppLookupDefect>
inline bool WireFormatLite::ReadGroupNoVirtualNoRecursionDepth(
    int field_number, io::CodedInputStream* input,
    MessageType_WorkAroundCppLookupDefect* value) {
  return value->MessageType_WorkAroundCppLookupDefect::
             MergePartialFromCodedStream(input) &&
         input->LastTagWas(MakeTag(field_number, WIRETYPE_END_GROUP));
}
template<typename MessageType_WorkAroundCppLookupDefect>
inline bool WireFormatLite::ReadMessageNoVirtual(
    io::CodedInputStream* input, MessageType_WorkAroundCppLookupDefect* value) {
  int length;
  if (!input->ReadVarintSizeAsInt(&length)) return false;
  std::pair<io::CodedInputStream::Limit, int> p =
      input->IncrementRecursionDepthAndPushLimit(length);
  if (p.second < 0 || !value->
      MessageType_WorkAroundCppLookupDefect::MergePartialFromCodedStream(input))
    return false;
  // Make sure that parsing stopped when the limit was hit, not at an endgroup
  // tag.
  return input->DecrementRecursionDepthAndPopLimit(p.first);
}

template<typename MessageType_WorkAroundCppLookupDefect>
inline bool WireFormatLite::ReadMessageNoVirtualNoRecursionDepth(
    io::CodedInputStream* input, MessageType_WorkAroundCppLookupDefect