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

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• Author : Jamie Madill
  Date : 2017-06-05 12:59:26
  Hash : 4f86d053
  Message : Introduce MemoryProgramCache. This class will manage GPU binary programs in memory. It will be owned by the Display, and shared between Contexts. Currently this CL just refactors the Program binary saving and loading into static members of this new class. BUG=angleproject:1897 Change-Id: I34f5afb2c02416f6fd80dd65ba3827a8637ce190 Reviewed-on: https://chromium-review.googlesource.com/522873 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Corentin Wallez <cwallez@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 <cstddef>
  #include <string>
  #include <vector>
  #include <stdint.h>
  
  #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>();
      }
  
      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()
      {
      }
  
      // 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);
          }
      }
  
      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));
      }
  
  };
  }  // namespace gl
  
  #endif  // LIBANGLE_BINARYSTREAM_H_