From 1f0533482b988d534fd50cfff1e5263cac3cda54 Mon Sep 17 00:00:00 2001
From: takase1121 <20792268+takase1121@users.noreply.github.com>
Date: Tue, 9 Jul 2024 18:04:37 +0800
Subject: [PATCH] utfconv: add functions that use arena_allocator

---
 src/utfconv.h | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/src/utfconv.h b/src/utfconv.h
index 59f98e4a..d5d9092e 100644
--- a/src/utfconv.h
+++ b/src/utfconv.h
@@ -12,8 +12,34 @@
 #include <stdlib.h>
 #include <windows.h>
 
+#include "arena_allocator.h"
+
 #define UTFCONV_ERROR_INVALID_CONVERSION "Input contains invalid byte sequences."
 
+#define utfconv_fromutf8(A, str) utfconv_fromlutf8(A, str, -1)
+
+static UNUSED LPWSTR utfconv_fromlutf8(lxl_arena *A, const char *str, int len) {
+  int output_len = MultiByteToWideChar(CP_UTF8, 0, str, len, NULL, 0);
+  if (!output_len) return NULL;
+  LPWSTR output = lxl_arena_malloc(A, sizeof(WCHAR) * output_len);
+  if (!output) return NULL;
+  output_len = MultiByteToWideChar(CP_UTF8, 0, str, len, output, output_len);
+  if (!output_len) return (lxl_arena_free(A, output), NULL);
+  return output;
+}
+
+#define utfconv_fromwstr(A, str) utfconv_fromlwstr(A, str, -1)
+
+static UNUSED const char *utfconv_fromlwstr(lxl_arena *A, LPWSTR str, int len) {
+  int output_len = WideCharToMultiByte(CP_UTF8, 0, str, len, NULL, 0, NULL, NULL);
+  if (!output_len) return NULL;
+  char *output = lxl_arena_malloc(A, sizeof(char) * output_len);
+  if (!output) return NULL;
+  output_len = WideCharToMultiByte(CP_UTF8, 0, str, len, output, output_len, NULL, NULL);
+  if (!output_len) return (lxl_arena_free(A, output), NULL);
+  return (const char *) output;
+}
+
 static UNUSED LPWSTR utfconv_utf8towc(const char *str) {
   LPWSTR output;
   int len;