A solution to split bytes into 7 bit chunks by ChatGPT

input.txt

We split bytes [0b1101_0101, 0b1010_1010] into 7 bit chunks like this [0b0101_0101, 0b0101_0101, 0b0000_0010]
Make a function in rust for any number of bytes.

output.rs

fn split_bytes_into_7bit_chunks(bytes: &[u8]) -> Vec<u8> {
    let mut chunks = Vec::new();
    let mut buffer: u16 = 0;
    let mut buffer_size = 0;
    
    for byte in bytes {
        buffer |= (*byte as u16) << buffer_size;
        buffer_size += 8;
    
        while buffer_size >= 7 {
            chunks.push((buffer & 0b0111_1111) as u8);
            buffer >>= 7;
            buffer_size -= 7;
        }
    }
    
    // If there are remaining bits in the buffer, add a final chunk
    if buffer_size > 0 {
        chunks.push((buffer & 0b0111_1111) as u8);
    }
    
    chunks
}

fn main() {
    let bytes = [0b1101_0101, 0b1010_1010];
    let chunks = split_bytes_into_7bit_chunks(&bytes);
    assert_eq!(chunks, [0b0101_0101, 0b0101_0101, 0b0000_0010]);
    
    let bytes = [0b1000_0000];
    let chunks = split_bytes_into_7bit_chunks(&bytes);
    assert_eq!(chunks, [0b0000_0000, 0b0000_0001]);
    
    let bytes = [0b0000_0000];
    let chunks = split_bytes_into_7bit_chunks(&bytes);
    assert_eq!(chunks, [0b0000_0000, 0b0000_0000]);
    
    let bytes = [0b0111_1111, 0b1111_1111];
    let chunks = split_bytes_into_7bit_chunks(&bytes);
    assert_eq!(chunks, [0b0111_1111, 0b0111_1110, 0b0000_0011]);
    
    let bytes = [0b0111_1111, 0b1111_1111, 0b0111_1110];
    let chunks = split_bytes_into_7bit_chunks(&bytes);
    assert_eq!(chunks, [0b0111_1111, 0b0111_1110, 0b0111_1011, 0b0000_0011]);
}