From a40017ef86c446ee2569b8c97680701625161f28 Mon Sep 17 00:00:00 2001
From: Jamie Reece Wilson <me@reece.sx>
Date: Fri, 14 Jun 2024 14:32:12 +0100
Subject: [PATCH] [+] AuCodepointsIsEqualIgnoreCase

---
 Include/auROXTL/auStringUtils.hpp | 70 ++++++++++++++++++++++++++++++-
 1 file changed, 69 insertions(+), 1 deletion(-)

diff --git a/Include/auROXTL/auStringUtils.hpp b/Include/auROXTL/auStringUtils.hpp
index 7b86513..090b7bd 100644
--- a/Include/auROXTL/auStringUtils.hpp
+++ b/Include/auROXTL/auStringUtils.hpp
@@ -12,13 +12,14 @@
 
     Implements: AuStringContains, AuEndsWith, AuStartsWith, AuReplaceAll, AuSplitString (views), AuSplitStringLegacy (returns an array of strings instead of views)
                 AuToLower(char), AuToUpper(char), AuToLower(view), AuToUpper(view).
-    Implements: AuCodepointsTransform, AuCodepointsTransformASCIIOp, AuCodepointsToLower, AuCodepointsToUpper,
+    Implements: AuCodepointsTransform, AuCodepointsTransformASCIIOp, AuCodepointsForEach, AuCodepointsToLower, AuCodepointsToUpper,
                 AuCodepointsCount, AuCodepointsNextLength, AuCodepointsDecode, AuCodepointsEncodeInto,
                 AuCodepointsGetByteOffset(CodepointOffset_t),AuCodepointsGetByteLength(CodepointOffset_t),
                 AuCodepointsFindByteOffset[Unsafe], AuCodepointsFindCodepointOffset(view, CodepointOffset_t), AuCodepointsFindCodepointOffset(CodepointByteOffset_t),
                 AuCodepointsContains,
                 AuCodepointsReplaceAll, AuCodepointsSplitString (views),
                 AuCodepointsFindPreviousValidByteOffsetFromOffset, AuCodepointsFindPreviousValidByteOffsetFromByteOffset
+                AuCodepointsIsEqualIgnoreCase
 
     For translating between locales (including utf8-32), defer to AuLocale (Aurora::Locale) in the Aurora Runtime.
 ***/
@@ -534,6 +535,73 @@ static bool AuCodepointsForEach(T op, const AuROString &in)
     return true;
 }
 
+static bool AuCodepointsIsEqualIgnoreCase(const AuROString &inA,
+                                          const AuROString &inB)
+{
+    if (inA.size() != 
+        inB.size())
+    {
+        return false;
+    }
+
+    if (inA.empty())
+    {
+        return true;
+    }
+
+    const char *pItr  = inA.data();
+    const char *pItr2 = inB.data();
+    const char *pEnd  = pItr + inA.length();
+
+    while (pItr < pEnd)
+    {
+        AuUInt32 c {};
+
+        if ((c = *pItr) <= 0x7FU)
+        {
+            if (AuToLower(c) != AuToLower(*pItr2))
+            {
+                return false;
+            }
+            ++pItr2;
+            ++pItr;
+        }
+        else
+        {
+            AuUInt32 nby {};
+
+            if ((*pItr & 0xC0U) != 0xC0U)
+            {
+                return AuMemcmp(pItr, pItr2, pEnd - pItr) == 0;
+            }
+
+            for (AuUInt8 b = *pItr; (b & 0x80U) != 0; b <<= 1, ++nby)
+            {
+            }
+
+            if (nby > kAuCodepointUTF8MaxBytes)
+            {
+                return AuMemcmp(pItr, pItr2, pEnd - pItr) == 0;
+            }
+
+            if (AuUInt(pEnd - pItr) < AuUInt(nby))
+            {
+                return AuMemcmp(pItr, pItr2, pEnd - pItr) == 0;
+            }
+
+            if (AuMemcmp(pItr, pItr2, nby) != 0)
+            {
+                return false;
+            }
+
+            pItr  += nby;
+            pItr2 += nby;
+        }
+    }
+
+    return true;
+}
+
 static auline CodepointByteOffset_t AuCodepointsGetByteOffset(const AuROString &in,
                                                               CodepointOffset_t uCodepointIndex)
 {