When working with large data sets that cannot fit into memory, the best approach is to use chunking or streaming, where the data is processed in smaller, manageable pieces rather than all at once.
This is particularly useful for operations like file I/O, where data is read or written in parts.
Writing Large Files in Chunks
To write large amounts of data, break the data into smaller chunks and write each chunk separately:
#include <SDL.h>
#include <iostream>
namespace File{
void WriteChunked(const std::string& Path,
const char* Data,
size_t TotalSize,
size_t ChunkSize) {
SDL_RWops* Handle = SDL_RWFromFile(
Path.c_str(), "ab");
if (!Handle) {
std::cout << "Error opening file: " <<
SDL_GetError() << std::endl;
return;
}
size_t Offset = 0;
while (Offset < TotalSize) {
size_t BytesToWrite = std::min(
ChunkSize, TotalSize - Offset);
SDL_RWwrite(Handle, Data + Offset,
sizeof(char), BytesToWrite);
Offset += BytesToWrite;
}
SDL_RWclose(Handle);
}
}Reading Large Files in Chunks
Similarly, you can read large files in chunks:
#include <SDL.h>
#include <iostream>
namespace File{
void ReadChunked(const std::string& Path,
size_t ChunkSize) {
SDL_RWops* Handle = SDL_RWFromFile(
Path.c_str(), "rb");
if (!Handle) {
std::cout << "Error opening file: " <<
SDL_GetError() << std::endl;
return;
}
char* Buffer = new char[ChunkSize];
size_t BytesRead;
while ((BytesRead = SDL_RWread(
Handle, Buffer, sizeof(char),
ChunkSize)) >
0) {
// Process the chunk
std::cout.write(Buffer, BytesRead);
}
delete[] Buffer;
SDL_RWclose(Handle);
}
}Why Chunking Is Effective
- Memory Efficiency: By processing smaller chunks, you minimize memory usage.
- Scalability: This approach scales well, allowing you to handle very large files or data streams without running out of memory.
Chunking or streaming is essential when working with log files, media files, or large datasets. It's a simple yet powerful way to manage large data without overwhelming your system's resources.
Answers to questions are automatically generated and may not have been reviewed.
Writing Data to Files
Learn to write and append data to files using SDL2's I/O functions.
