Test

backend/application/src/video/service.rs

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+// Video service implementations for streaming files chunk by chunk
+
+use std::fs::File;
+use std::io::{BufRead, BufReader};
+use std::path::Path;
+use std::io::Read;
+
+/// Basic example: Read file line by line using BufReader
+pub fn read_file_line_by_line(path: &str) -> std::io::Result<()> {
+    let path = Path::new(path);
+    let file = File::open(path)?;
+    let reader = BufReader::new(file);
+
+    // Read line by line
+    for line in reader.lines() {
+        let line = line?;
+        println!("Line: {}", line);
+    }
+
+    Ok(())
+}
+
+/// Read file in fixed-size chunks
+pub fn read_file_in_chunks(path: &str, chunk_size: usize) -> std::io::Result<()> {
+    let mut file = File::open(path)?;
+    let mut buffer = vec![0; chunk_size];
+
+    loop {
+        let n = file.read(&mut buffer)?;
+        if n == 0 {
+            break; // EOF
+        }
+        println!("Read {} bytes: {:?}", n, &buffer[..n]);
+    }
+
+    Ok(())
+}
+
+/// Using std::io::copy for streaming between files
+pub fn copy_file_streaming(input_path: &str, output_path: &str) -> std::io::Result<()> {
+    use std::io;
+    
+    let mut input = File::open(input_path)?;
+    let mut output = File::create(output_path)?;
+
+    // Copy in chunks without loading entire file into memory
+    io::copy(&mut input, &mut output)?;
+
+    Ok(())
+}
+
+/// Process large files efficiently with configurable buffer size
+pub fn process_large_file(path: &str, buffer_size: usize) -> std::io::Result<()> {
+    let file = File::open(path)?;
+    let mut reader = BufReader::new(file);
+    let mut buffer = vec![0; buffer_size];
+
+    loop {
+        let bytes_read = reader.read(&mut buffer)?;
+        if bytes_read == 0 {
+            break;
+        }
+        process_chunk(&buffer[..bytes_read]);
+    }
+
+    Ok(())
+}
+
+/// Example chunk processing function
+fn process_chunk(chunk: &[u8]) {
+    // Process your chunk here
+    println!("Processing {} bytes", chunk.len());
+}