33 const CHUNK: usize = 64;  constant
43     let mut chunkmap = Map::<[u8; CHUNK], u8>::new();  in main()
44     let mut dense = Vec::<[u8; CHUNK]>::new();  in main()
58     let empty_chunk = [0u8; CHUNK];  in main()
63     for i in 0..(u32::from(char::MAX) + 1) / CHUNK as u32 / 8 {  in main()
66         for j in 0..CHUNK as u32 {  in main()
70                 let code = (i * CHUNK as u32 + j) * 8 + k;  in main()
92         let mut front = [0u8; CHUNK / 2];  in main()
93         let mut back = [0u8; CHUNK / 2];  in main()
94         front.copy_from_slice(&chunk[..CHUNK / 2]);  in main()
95         back.copy_from_slice(&chunk[CHUNK / 2..]);  in main()
109         let mut front = [0u8; CHUNK / 2];  in main()
110         let mut back = [0u8; CHUNK / 2];  in main()
111         front.copy_from_slice(&chunk[..CHUNK / 2]);  in main()
112         back.copy_from_slice(&chunk[CHUNK / 2..]);  in main()
115             match u8::try_from(halfdense.len() / (CHUNK / 2)) {  in main()
124             concat[..CHUNK / 2].copy_from_slice(&back);  in main()
125             concat[CHUNK / 2..].copy_from_slice(&next);  in main()
132                 match u8::try_from(halfdense.len() / (CHUNK / 2) - 1) {  in main()