From 79ee884338498720e1addf2cfac838783c46ad38 Mon Sep 17 00:00:00 2001 From: edgul Date: Sat, 25 Jul 2026 20:13:56 -0400 Subject: [PATCH] updated comments --- src/lib.rs | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/src/lib.rs b/src/lib.rs index 393df2e..5d58c83 100644 --- a/src/lib.rs +++ b/src/lib.rs @@ -8,16 +8,16 @@ pub fn encode(bytes: Vec) -> String { let b1 = chunk.get(1).copied().unwrap_or(0) as u32; let b2 = chunk.get(2).copied().unwrap_or(0) as u32; - // 24-bit number + // make 24-bit number from 3 Bytes let triple = (b0 << 16) | (b1 << 8) | b2; - // in 6-bit indices + // pull out 6-bit indices let i0 = ((triple >> 18) & 0x3F) as usize; let i1 = ((triple >> 12) & 0x3F) as usize; let i2 = ((triple >> 6) & 0x3F) as usize; let i3 = (triple & 0x3F) as usize; - // at least 1 chunk of 8-bit input + // at least 1 chunk of 8-bit input is guaranteed valid // so at least 2 chunks of 6-bit window is valid output.push(BASE64_ALPHABET[i0] as char); output.push(BASE64_ALPHABET[i1] as char); @@ -57,4 +57,5 @@ mod tests { let base64 = encode(bytes); assert_eq!(base64, String::from("Zg==")); } + // todo: add more tests }