From 3916347130f07b509f8b5b01899ed740a14121cb Mon Sep 17 00:00:00 2001
From: Charles Iliya Krempeaux <iamreiver@gmail.com>
Date: Sat, 9 Dec 2023 10:40:10 -0800
Subject: [PATCH] initial commits

---
 eol/bytes_tolerant.go      |  36 ++++++++++
 eol/bytes_tolerant_test.go | 130 +++++++++++++++++++++++++++++++++++++
 2 files changed, 166 insertions(+)
 create mode 100644 eol/bytes_tolerant.go
 create mode 100644 eol/bytes_tolerant_test.go

diff --git a/eol/bytes_tolerant.go b/eol/bytes_tolerant.go
new file mode 100644
index 0000000..6ba0cc3
--- /dev/null
+++ b/eol/bytes_tolerant.go
@@ -0,0 +1,36 @@
+package eol
+
+func BytesTolerant(p []byte) (result []byte, rest []byte, ok bool) {
+
+	length := len(p)
+
+	if length <= 0 {
+		return nil, p, false
+	}
+
+	var p0 byte = p[0]
+
+	switch p0 {
+	case '\n':
+		return p[:1], p[1:], true
+	case '\r':
+		// Nothing here.
+	default:
+		return nil, p, false
+	}
+
+	// If we got here then p0 == '\r'
+
+	if length < 2 {
+		return nil, p, false
+	}
+
+	var p1 byte = p[1]
+
+	switch p1 {
+	case '\n':
+		return p[:2], p[2:], true
+	default:
+		return nil, p, false
+	}
+}
diff --git a/eol/bytes_tolerant_test.go b/eol/bytes_tolerant_test.go
new file mode 100644
index 0000000..d40e50d
--- /dev/null
+++ b/eol/bytes_tolerant_test.go
@@ -0,0 +1,130 @@
+package eol_test
+
+import (
+	"testing"
+
+	"bytes"
+
+	"sourcecode.social/reiver/go-rfc2616/eol"
+)
+
+func TestBytesTolerant(t *testing.T) {
+
+	tests := []struct{
+		Value []byte
+		ExpectedResult []byte
+		ExpectedRest []byte
+		ExpectedOK bool
+	}{
+		{
+			Value: nil,
+			ExpectedResult: nil,
+			ExpectedRest: nil,
+			ExpectedOK: false,
+		},
+		{
+			Value: []byte(nil),
+			ExpectedResult: nil,
+			ExpectedRest: nil,
+			ExpectedOK: false,
+		},
+
+
+
+		{
+			Value: []byte{},
+			ExpectedResult: nil,
+			ExpectedRest: nil,
+			ExpectedOK: false,
+		},
+		{
+			Value: []byte(""),
+			ExpectedResult: nil,
+			ExpectedRest: nil,
+			ExpectedOK: false,
+		},
+
+
+
+		{
+			Value         : []byte("\n"),
+			ExpectedResult: []byte("\n"),
+			ExpectedRest: nil,
+			ExpectedOK: true,
+		},
+		{
+			Value         : []byte("\r\n"),
+			ExpectedResult: []byte("\r\n"),
+			ExpectedRest: nil,
+			ExpectedOK: true,
+		},
+
+
+
+		{
+			Value         : []byte("\nHost: example.com\n"),
+			ExpectedResult: []byte("\n"),
+			ExpectedRest:     []byte("Host: example.com\n"),
+			ExpectedOK: true,
+		},
+		{
+			Value         : []byte("\r\nHost: example.com\r\n"),
+			ExpectedResult: []byte("\r\n"),
+			ExpectedRest:       []byte("Host: example.com\r\n"),
+			ExpectedOK: true,
+		},
+
+
+
+		{
+			Value:        []byte("\r"),
+			ExpectedResult: nil,
+			ExpectedRest: []byte("\r"),
+			ExpectedOK: false,
+		},
+	}
+
+	for testNumber, test := range tests {
+
+		actualResult, actualRest, actualOK := eol.BytesTolerant(test.Value)
+
+		{
+			expected := test.ExpectedOK
+			actual   := actualOK
+
+			if expected != actual {
+				t.Errorf("For test #%d, the actual ok-result is not what wad expected.", testNumber)
+				t.Logf("EXPECTED: %t", expected)
+				t.Logf("ACTUAL:   %t", actual)
+				t.Logf("VALUE: %q (%#v)", test.Value, test.Value)
+				continue
+			}
+		}
+
+		{
+			expected := test.ExpectedResult
+			actual   := actualResult
+
+			if !bytes.Equal(expected, actual) {
+				t.Errorf("For test #%d, the actual result is not what wad expected.", testNumber)
+				t.Logf("EXPECTED: %q (%#v)", expected, expected)
+				t.Logf("ACTUAL:   %q (%#v)", actual, actual)
+				t.Logf("VALUE: %q (%#v)", test.Value, test.Value)
+				continue
+			}
+		}
+
+		{
+			expected := test.ExpectedRest
+			actual   := actualRest
+
+			if !bytes.Equal(expected, actual) {
+				t.Errorf("For test #%d, the actual rest is not what wad expected.", testNumber)
+				t.Logf("EXPECTED: %q (%#v)", expected, expected)
+				t.Logf("ACTUAL:   %q (%#v)", actual, actual)
+				t.Logf("VALUE: %q (%#v)", test.Value, test.Value)
+				continue
+			}
+		}
+	}
+}