From 3cd23ecc90a1385accfd82e8b4bab3c7126b8cf5 Mon Sep 17 00:00:00 2001
From: Rutger Broekhoff
Date: Mon, 24 May 2021 14:53:29 +0200
Subject: Remove some unnecessary code

---
 src/base32.zig | 20 +++++---------------
 src/nkeys.zig  |  3 +--
 2 files changed, 6 insertions(+), 17 deletions(-)

diff --git a/src/base32.zig b/src/base32.zig
index d612e7a..749c313 100644
--- a/src/base32.zig
+++ b/src/base32.zig
@@ -64,18 +64,8 @@ pub const Encoder = struct {
     /// | 6              | 0b11000     |
     /// | 7              | 0b10000     |
     fn frontBits(self: *const Self) ?u5 {
-        // bit_off   bitmask      shl   shr   frontBits
-        // 0         0b11111000         3     0b11111
-        // 1         0b01111100         2     0b11111
-        // 2         0b00111110         1     0b11111
-        // 3         0b00011111   0     0     0b11111
-        // 4         0b00001111   1           0b11110
-        // 5         0b00000111   2           0b11100
-        // 6         0b00000011   3           0b11000
-        // 7         0b00000001   4           0b10000
         const index = self.index orelse return null;
-        const bitmask = @as(u8, 0b11111000) >> self.bit_off;
-        const bits = self.buffer[index] & bitmask;
+        const bits = self.buffer[index];
         if (self.bit_off >= 4) return @truncate(u5, bits << (self.bit_off - 3));
         return @truncate(u5, bits >> (3 - self.bit_off));
     }
@@ -87,10 +77,10 @@ pub const Encoder = struct {
     /// | `bits` | `backBits` |
     /// |--------|------------|
     /// | 0      | 0b00000    |
-    /// | 1      | 0b10000    |
-    /// | 2      | 0b11000    |
-    /// | 3      | 0b11100    |
-    /// | 4      | 0b11100    |
+    /// | 1      | 0b00001    |
+    /// | 2      | 0b00011    |
+    /// | 3      | 0b00111    |
+    /// | 4      | 0b01110    |
     /// | 5      | 0b11101    |
     fn backBits(self: *const Self, bits: u3) u5 {
         std.debug.assert(bits <= 5);
diff --git a/src/nkeys.zig b/src/nkeys.zig
index 3a6c2db..e3d9ef9 100644
--- a/src/nkeys.zig
+++ b/src/nkeys.zig
@@ -274,7 +274,7 @@ pub fn decodeSeed(text: *const text_seed) SeedDecodeError!DecodedSeed {
     defer decoded.wipe(); // gets copied
 
     var key_ty_prefix = decoded.prefix[0] & 0b11111000;
-    var entity_ty_prefix = (decoded.prefix[0] & 0b00000111) << 5 | ((decoded.prefix[1] & 0b11111000) >> 3);
+    var entity_ty_prefix = (decoded.prefix[0] << 5) | (decoded.prefix[1] >> 3);
 
     if (key_ty_prefix != @enumToInt(KeyTypePrefixByte.seed))
         return error.InvalidSeed;
@@ -328,7 +328,6 @@ const allowed_creds_section_chars_table: [256]bool = allowed: {
     var table = [_]bool{false} ** 256;
     const chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_-.=";
     for (chars) |char| table[char] = true;
-
     break :allowed table;
 };
 
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