axmol/cocos/base/CCData.cpp

/****************************************************************************
 Copyright (c) 2010-2012 cocos2d-x.org
 Copyright (c) 2013-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

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 of this software and associated documentation files (the "Software"), to deal
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 furnished to do so, subject to the following conditions:

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 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#include "base/CCData.h"
#include "base/CCConsole.h"

NS_CC_BEGIN

const Data Data::Null;

Data::Data() : _bytes(nullptr), _size(0)
{
    CCLOGINFO("In the empty constructor of Data.");
}

Data::Data(Data&& other) : _bytes(nullptr), _size(0)
{
    CCLOGINFO("In the move constructor of Data.");
    move(other);
}

Data::Data(const Data& other) : _bytes(nullptr), _size(0)
{
    CCLOGINFO("In the copy constructor of Data.");
    if (other._bytes && other._size)
    {
        copy(other._bytes, other._size);
    }
}

Data::~Data()
{
    CCLOGINFO("deallocing Data: %p", this);
    clear();
}

Data& Data::operator=(const Data& other)
{
    if (this != &other)
    {
        CCLOGINFO("In the copy assignment of Data.");
        copy(other._bytes, other._size);
    }
    return *this;
}

Data& Data::operator=(Data&& other)
{
    if (this != &other)
    {
        CCLOGINFO("In the move assignment of Data.");
        move(other);
    }
    return *this;
}

void Data::move(Data& other)
{
    if (_bytes != other._bytes)
        clear();

    _bytes = other._bytes;
    _size  = other._size;

    other._bytes = nullptr;
    other._size  = 0;
}

bool Data::isNull() const
{
    return (_bytes == nullptr || _size == 0);
}

uint8_t* Data::getBytes() const
{
    return _bytes;
}

ssize_t Data::getSize() const
{
    return _size;
}

ssize_t Data::copy(const unsigned char* bytes, const ssize_t size)
{
    CCASSERT(size >= 0, "copy size should be non-negative");
    CCASSERT(bytes, "bytes should not be nullptr");

    if (size <= 0)
        return 0;

    if (bytes != _bytes)
    {
        clear();
        _bytes = (unsigned char*)malloc(sizeof(unsigned char) * size);
        memcpy(_bytes, bytes, size);
    }

    _size = size;
    return _size;
}

uint8_t* Data::resize(ssize_t size)
{
    if (_size < size)
    {
        auto newmb = (uint8_t*)realloc(_bytes, size);
        if (!newmb)
            return _bytes;
        _bytes = newmb;
    }
    _size = size;
    return _bytes;
}

void Data::fastSet(uint8_t* bytes, const ssize_t size)
{
    CCASSERT(size >= 0, "fastSet size should be non-negative");
    // CCASSERT(bytes, "bytes should not be nullptr");
    _bytes = bytes;
    _size  = size;
}

void Data::clear()
{
    if (_bytes)
        free(_bytes);
    _bytes = nullptr;
    _size  = 0;
}

uint8_t* Data::takeBuffer(ssize_t* size)
{
    auto buffer = getBytes();
    if (size)
        *size = getSize();
    fastSet(nullptr, 0);
    return buffer;
}

NS_CC_END