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

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• Hash : 2e0490ee
  Author :
  Date : 2021-01-18T14:21:46
  

  Capture/Replay: Serialize float states properly.
  
  Previously we were always casting to int. Instead add a float
  serialization helper function.
  
  Bug: angleproject:5530
  Change-Id: Ifc80e1dbad9da8a04b3b013c3a3ffa60444f6d26
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2634829
  Reviewed-by: Cody Northrop <cnorthrop@google.com>
  Reviewed-by: Tim Van Patten <timvp@google.com>
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  

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• src/libANGLE/BinaryStream.h

• //
  // Copyright 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
  {
  template <typename IntT>
  struct PromotedIntegerType
  {
      using type = typename std::conditional<
          std::is_signed<IntT>::value,
          typename std::conditional<sizeof(IntT) <= 4, int32_t, int64_t>::type,
          typename std::conditional<sizeof(IntT) <= 4, uint32_t, uint64_t>::type>::type;
  };
  
  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()
      {
          static_assert(!std::is_same<bool, std::remove_cv<IntT>()>(), "Use readBool");
          using PromotedIntT = typename PromotedIntegerType<IntT>::type;
          PromotedIntT value = 0;
          read(&value);
          ASSERT(angle::IsValueInRangeForNumericType<IntT>(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)
      {
          size_t size = readInt<size_t>();
          for (size_t 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();
      }
  
      float readFloat()
      {
          float f;
          read(&f, 1);
          return f;
      }
  
      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; }
      size_t remainingSize() const
      {
          ASSERT(mLength >= mOffset);
          return mLength - 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)
      {
          static_assert(std::is_integral<IntT>::value, "Not an integral type");
          static_assert(!std::is_same<bool, std::remove_cv<IntT>()>(), "Use writeBool");
          using PromotedIntT = typename PromotedIntegerType<IntT>::type;
          ASSERT(angle::IsValueInRangeForNumericType<PromotedIntT>(param));
          PromotedIntT intValue = static_cast<PromotedIntT>(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(const 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); }
  
      void writeBool(bool value)
      {
          int intValue = value ? 1 : 0;
          write(&intValue, 1);
      }
  
      void writeFloat(float value) { write(&value, 1); }
  
      size_t length() const { return mData.size(); }
  
      const void *data() const { return mData.size() ? &mData[0] : nullptr; }
  
      const std::vector<uint8_t> &getData() const { return mData; }
  
    private:
      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));
      }
  
      std::vector<uint8_t> mData;
  };
  
  inline BinaryOutputStream::BinaryOutputStream() {}
  
  inline BinaryOutputStream::~BinaryOutputStream() = default;
  
  }  // namespace gl
  
  #endif  // LIBANGLE_BINARYSTREAM_H_
  

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