BinaryStream.h

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Author : Stuart Morgan
Date : 2019-08-14 12:25:12
Hash : 9d737966
Message : Standardize copyright notices to project style For all "ANGLE Project" copyrights, standardize to the format specified by the style guide. Changes: - "Copyright (c)" and "Copyright(c)" changed to just "Copyright". - Removed the second half of date ranges ("Y1Y1-Y2Y2"->"Y1Y1"). - Fixed a small number of files that had no copyright date using the initial commit year from the version control history. - Fixed one instance of copyright being "The ANGLE Project" rather than "The ANGLE Project Authors" These changes are applied both to the copyright of source file, and where applicable to copyright statements that are generated by templates. BUG=angleproject:3811 Change-Id: I973dd65e4ef9deeba232d5be74c768256a0eb2e5 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1754397 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>

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
{

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; }
    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)
    {
        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_

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

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