kc3-lang/angle/src/libANGLE/BinaryStream.h

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• Author : Jamie Madill
  Date : 2018-11-27 11:34:27
  Hash : b980c563
  Message : Reformat all cpp and h files. This applies git cl format --full to all ANGLE sources. Bug: angleproject:2986 Change-Id: Ib504e618c1589332a37e97696cdc3515d739308f Reviewed-on: https://chromium-review.googlesource.com/c/1351367 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>

• src/libANGLE/BinaryStream.h

• //
  // Copyright (c) 2012 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  // BinaryStream.h: Provides binary serialization of simple types.
  
  #ifndef LIBANGLE_BINARYSTREAM_H_
  #define LIBANGLE_BINARYSTREAM_H_
  
  #include <stdint.h>
  #include <cstddef>
  #include <string>
  #include <vector>
  
  #include "common/angleutils.h"
  #include "common/mathutil.h"
  
  namespace gl
  {
  
  class BinaryInputStream : angle::NonCopyable
  {
    public:
      BinaryInputStream(const void *data, size_t length)
      {
          mError  = false;
          mOffset = 0;
          mData   = static_cast<const uint8_t *>(data);
          mLength = length;
      }
  
      // readInt will generate an error for bool types
      template <class IntT>
      IntT readInt()
      {
          int value = 0;
          read(&value);
          return static_cast<IntT>(value);
      }
  
      template <class IntT>
      void readInt(IntT *outValue)
      {
          *outValue = readInt<IntT>();
      }
  
      template <class IntT, class VectorElementT>
      void readIntVector(std::vector<VectorElementT> *param)
      {
          unsigned int size = readInt<unsigned int>();
          for (unsigned int index = 0; index < size; ++index)
          {
              param->push_back(readInt<IntT>());
          }
      }
  
      template <class EnumT>
      EnumT readEnum()
      {
          using UnderlyingType = typename std::underlying_type<EnumT>::type;
          return static_cast<EnumT>(readInt<UnderlyingType>());
      }
  
      template <class EnumT>
      void readEnum(EnumT *outValue)
      {
          *outValue = readEnum<EnumT>();
      }
  
      bool readBool()
      {
          int value = 0;
          read(&value);
          return (value > 0);
      }
  
      void readBool(bool *outValue) { *outValue = readBool(); }
  
      void readBytes(unsigned char outArray[], size_t count) { read<unsigned char>(outArray, count); }
  
      std::string readString()
      {
          std::string outString;
          readString(&outString);
          return outString;
      }
  
      void readString(std::string *v)
      {
          size_t length;
          readInt(&length);
  
          if (mError)
          {
              return;
          }
  
          angle::CheckedNumeric<size_t> checkedOffset(mOffset);
          checkedOffset += length;
  
          if (!checkedOffset.IsValid() || mOffset + length > mLength)
          {
              mError = true;
              return;
          }
  
          v->assign(reinterpret_cast<const char *>(mData) + mOffset, length);
          mOffset = checkedOffset.ValueOrDie();
      }
  
      void skip(size_t length)
      {
          angle::CheckedNumeric<size_t> checkedOffset(mOffset);
          checkedOffset += length;
  
          if (!checkedOffset.IsValid() || mOffset + length > mLength)
          {
              mError = true;
              return;
          }
  
          mOffset = checkedOffset.ValueOrDie();
      }
  
      size_t offset() const { return mOffset; }
  
      bool error() const { return mError; }
  
      bool endOfStream() const { return mOffset == mLength; }
  
      const uint8_t *data() { return mData; }
  
    private:
      bool mError;
      size_t mOffset;
      const uint8_t *mData;
      size_t mLength;
  
      template <typename T>
      void read(T *v, size_t num)
      {
          static_assert(std::is_fundamental<T>::value, "T must be a fundamental type.");
  
          angle::CheckedNumeric<size_t> checkedLength(num);
          checkedLength *= sizeof(T);
          if (!checkedLength.IsValid())
          {
              mError = true;
              return;
          }
  
          angle::CheckedNumeric<size_t> checkedOffset(mOffset);
          checkedOffset += checkedLength;
  
          if (!checkedOffset.IsValid() || checkedOffset.ValueOrDie() > mLength)
          {
              mError = true;
              return;
          }
  
          memcpy(v, mData + mOffset, checkedLength.ValueOrDie());
          mOffset = checkedOffset.ValueOrDie();
      }
  
      template <typename T>
      void read(T *v)
      {
          read(v, 1);
      }
  };
  
  class BinaryOutputStream : angle::NonCopyable
  {
    public:
      BinaryOutputStream();
      ~BinaryOutputStream();
  
      // writeInt also handles bool types
      template <class IntT>
      void writeInt(IntT param)
      {
          ASSERT(angle::IsValueInRangeForNumericType<int>(param));
          int intValue = static_cast<int>(param);
          write(&intValue, 1);
      }
  
      // Specialized writeInt for values that can also be exactly -1.
      template <class UintT>
      void writeIntOrNegOne(UintT param)
      {
          if (param == static_cast<UintT>(-1))
          {
              writeInt(-1);
          }
          else
          {
              writeInt(param);
          }
      }
  
      template <class IntT>
      void writeIntVector(std::vector<IntT> param)
      {
          writeInt(param.size());
          for (IntT element : param)
          {
              writeIntOrNegOne(element);
          }
      }
  
      template <class EnumT>
      void writeEnum(EnumT param)
      {
          using UnderlyingType = typename std::underlying_type<EnumT>::type;
          writeInt<UnderlyingType>(static_cast<UnderlyingType>(param));
      }
  
      void writeString(const std::string &v)
      {
          writeInt(v.length());
          write(v.c_str(), v.length());
      }
  
      void writeBytes(const unsigned char *bytes, size_t count) { write(bytes, count); }
  
      size_t length() const { return mData.size(); }
  
      const void *data() const { return mData.size() ? &mData[0] : nullptr; }
  
    private:
      std::vector<char> mData;
  
      template <typename T>
      void write(const T *v, size_t num)
      {
          static_assert(std::is_fundamental<T>::value, "T must be a fundamental type.");
          const char *asBytes = reinterpret_cast<const char *>(v);
          mData.insert(mData.end(), asBytes, asBytes + num * sizeof(T));
      }
  };
  
  inline BinaryOutputStream::BinaryOutputStream() {}
  
  inline BinaryOutputStream::~BinaryOutputStream() = default;
  
  }  // namespace gl
  
  #endif  // LIBANGLE_BINARYSTREAM_H_