From 71559a48afc860d124b4ddfeb8df752b22a25053 Mon Sep 17 00:00:00 2001
From: Runxi Yu <me@runxiyu.org>
Date: Sun, 23 Mar 2025 12:01:36 +0800
Subject: Separate validateBitZeros into a separate file

---
 bitwise.go      | 21 ++++++++++++++
 bitwise_test.go | 90 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 main.go         | 20 -------------
 main_test.go    | 90 ---------------------------------------------------------
 4 files changed, 111 insertions(+), 110 deletions(-)
 create mode 100644 bitwise.go
 create mode 100644 bitwise_test.go
 delete mode 100644 main_test.go

diff --git a/bitwise.go b/bitwise.go
new file mode 100644
index 0000000..b9b6f47
--- /dev/null
+++ b/bitwise.go
@@ -0,0 +1,21 @@
+package main
+
+func validateBitZeros(bs []byte, n uint) bool {
+	q := n / 8
+	r := n % 8
+
+	for i := uint(0); i < q; i++ {
+		if bs[i] != 0 {
+			return false
+		}
+	}
+
+	if r > 0 {
+		mask := byte(0xFF << (8 - r))
+		if bs[q]&mask != 0 {
+			return false
+		}
+	}
+
+	return true
+}
diff --git a/bitwise_test.go b/bitwise_test.go
new file mode 100644
index 0000000..394d407
--- /dev/null
+++ b/bitwise_test.go
@@ -0,0 +1,90 @@
+package main
+
+import (
+	"testing"
+)
+
+func TestValidateBitZeros(t *testing.T) {
+	tests := []struct {
+		name     string
+		bs       []byte
+		n        uint
+		expected bool
+	}{
+		{
+			name:     "First 8 bits are zeros",
+			bs:       []byte{0x00, 0x01},
+			n:        8,
+			expected: true,
+		},
+		{
+			name:     "First 8 bits are not all zeros",
+			bs:       []byte{0x01, 0x00},
+			n:        8,
+			expected: false,
+		},
+		{
+			name:     "First 16 bits are zeros",
+			bs:       []byte{0x00, 0x00, 0x01},
+			n:        16,
+			expected: true,
+		},
+		{
+			name:     "First 16 bits are not all zeros",
+			bs:       []byte{0x01, 0x00, 0x00},
+			n:        16,
+			expected: false,
+		},
+		{
+			name:     "First 9 bits are zeros",
+			bs:       []byte{0x00, 0x01},
+			n:        9,
+			expected: true,
+		},
+		{
+			name:     "First 9 bits are not all zeros",
+			bs:       []byte{0x01, 0x01},
+			n:        9,
+			expected: false,
+		},
+		{
+			name:     "First 10 bits are zeros",
+			bs:       []byte{0x00, 0x20},
+			n:        10,
+			expected: true,
+		},
+		{
+			name:     "First 10 bits are not all zeros",
+			bs:       []byte{0x00, 0x40},
+			n:        10,
+			expected: false,
+		},
+		{
+			name:     "First 24 bits are zeros",
+			bs:       []byte{0x00, 0x00, 0x00, 0x01},
+			n:        24,
+			expected: true,
+		},
+		{
+			name:     "First 24 bits are not all zeros",
+			bs:       []byte{0x00, 0x01, 0x00, 0x00},
+			n:        24,
+			expected: false,
+		},
+		{
+			name:     "Checking zero bits",
+			bs:       []byte{0xFF, 0xFF},
+			n:        0,
+			expected: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := validateBitZeros(tt.bs, tt.n)
+			if got != tt.expected {
+				t.Errorf("validateBitZeros(%v, %v) = %v; want %v", tt.bs, tt.n, got, tt.expected)
+			}
+		})
+	}
+}
diff --git a/main.go b/main.go
index 0ff17e3..0c44222 100644
--- a/main.go
+++ b/main.go
@@ -197,23 +197,3 @@ func proxyRequest(writer http.ResponseWriter, request *http.Request) {
 func stringToBytes(s string) (bytes []byte) {
 	return unsafe.Slice(unsafe.StringData(s), len(s))
 }
-
-func validateBitZeros(bs []byte, n uint) bool {
-	q := n / 8
-	r := n % 8
-
-	for i := uint(0); i < q; i++ {
-		if bs[i] != 0 {
-			return false
-		}
-	}
-
-	if r > 0 {
-		mask := byte(0xFF << (8 - r))
-		if bs[q]&mask != 0 {
-			return false
-		}
-	}
-
-	return true
-}
diff --git a/main_test.go b/main_test.go
deleted file mode 100644
index 394d407..0000000
--- a/main_test.go
+++ /dev/null
@@ -1,90 +0,0 @@
-package main
-
-import (
-	"testing"
-)
-
-func TestValidateBitZeros(t *testing.T) {
-	tests := []struct {
-		name     string
-		bs       []byte
-		n        uint
-		expected bool
-	}{
-		{
-			name:     "First 8 bits are zeros",
-			bs:       []byte{0x00, 0x01},
-			n:        8,
-			expected: true,
-		},
-		{
-			name:     "First 8 bits are not all zeros",
-			bs:       []byte{0x01, 0x00},
-			n:        8,
-			expected: false,
-		},
-		{
-			name:     "First 16 bits are zeros",
-			bs:       []byte{0x00, 0x00, 0x01},
-			n:        16,
-			expected: true,
-		},
-		{
-			name:     "First 16 bits are not all zeros",
-			bs:       []byte{0x01, 0x00, 0x00},
-			n:        16,
-			expected: false,
-		},
-		{
-			name:     "First 9 bits are zeros",
-			bs:       []byte{0x00, 0x01},
-			n:        9,
-			expected: true,
-		},
-		{
-			name:     "First 9 bits are not all zeros",
-			bs:       []byte{0x01, 0x01},
-			n:        9,
-			expected: false,
-		},
-		{
-			name:     "First 10 bits are zeros",
-			bs:       []byte{0x00, 0x20},
-			n:        10,
-			expected: true,
-		},
-		{
-			name:     "First 10 bits are not all zeros",
-			bs:       []byte{0x00, 0x40},
-			n:        10,
-			expected: false,
-		},
-		{
-			name:     "First 24 bits are zeros",
-			bs:       []byte{0x00, 0x00, 0x00, 0x01},
-			n:        24,
-			expected: true,
-		},
-		{
-			name:     "First 24 bits are not all zeros",
-			bs:       []byte{0x00, 0x01, 0x00, 0x00},
-			n:        24,
-			expected: false,
-		},
-		{
-			name:     "Checking zero bits",
-			bs:       []byte{0xFF, 0xFF},
-			n:        0,
-			expected: true,
-		},
-	}
-
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			got := validateBitZeros(tt.bs, tt.n)
-			if got != tt.expected {
-				t.Errorf("validateBitZeros(%v, %v) = %v; want %v", tt.bs, tt.n, got, tt.expected)
-			}
-		})
-	}
-}
-- 
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