MemoryAccessor.cpp

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#include "stdafx.h"
#include "MemoryAccessor.h"


using namespace kome::core;


#include <crtdbg.h>
#ifdef _DEBUG
    #define new new( _NORMAL_BLOCK, __FILE__, __LINE__ )
    #define malloc( s ) _malloc_dbg( s, _NORMAL_BLOCK, __FILE__, __LINE__ )
#endif    // _DEBUG



// constructor
MemoryAccessor::MemoryAccessor( void* addr, const unsigned int size ) {
    m_addr = (unsigned char*)addr;
    m_size = size;

    m_pos = 0;
}

// destructor
MemoryAccessor::~MemoryAccessor() {
}

// get data
void* MemoryAccessor::getData() {
    return m_addr;
}

// get data size
unsigned int MemoryAccessor::getSize() {
    return m_size;
}

// set reading position
void MemoryAccessor::setPosition( const unsigned int pos ) {
    m_pos = std::min( pos, m_size );
}

// write data
int MemoryAccessor::write( void* addr, int size ) {
    // check parameters
    if( addr == NULL || size <= 0 ) {
        return 0;
    }

    // actual size
    int actualSize = std::min( size, (int)m_size - (int)m_pos );
    if( actualSize <= 0 ) {
        return 0;
    }

    // write
    memcpy( m_addr + m_pos, addr, actualSize );
    m_pos += actualSize;

    return actualSize;
}

// read data
int MemoryAccessor::read( void* addr, int size ) {
    // check parameters
    if( addr == NULL || size <= 0 ) {
        return 0;
    }

    // actual size
    int actualSize = std::min( size, (int)m_size - (int)m_pos );
    if( actualSize <= 0 ) {
        return 0;
    }

    // read
    memcpy( addr, m_addr + m_pos, actualSize );
    m_pos += actualSize;

    return actualSize;
}