inline bool FileLoader::readBytes(unsigned char* buffer, unsigned int size, long pos)
{
    if(m_use_cache){
        //seek at pos
        unsigned long reading, remain = size, bufferPos = 0;
        do{
            //prepare cache
            unsigned long i = getCacheBlock(pos);
            if(i == NO_VALID_CACHE)
                return false;

            m_cache_index = i;
            m_cache_offset = pos - m_cached_data[i].base;

            //get maximun read block size and calculate remaining bytes
            reading = std::min(remain, m_cached_data[i].size - m_cache_offset);
            remain = remain - reading;

            //read it
            memcpy(buffer + bufferPos, m_cached_data[m_cache_index].data + m_cache_offset, reading);

            //update variables
            m_cache_offset = m_cache_offset + reading;
            bufferPos = bufferPos + reading;
            pos = pos + reading;
        }while(remain > 0);
        return true;
    }
    else{
        if(fseek(m_file, pos, SEEK_SET)){
            m_lastError = ERROR_SEEK_ERROR;
            return false;
        }
        size_t value = fread(buffer, 1, size, m_file);
        if(value != size){
            m_lastError = ERROR_EOF;
            return false;
        }
        else{
            return true;
        }
    }
}