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node_modules/mariadb/lib/misc/charset-mb.js

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+//  SPDX-License-Identifier: LGPL-2.1-or-later
+//  Copyright (c) 2015-2026 MariaDB Corporation Ab
+
+'use strict';
+
+// Per-charset multibyte recognizers used by PacketOutputStream#writeBufferEscape
+// to avoid splitting a valid multibyte character with an inserted escape byte.
+//
+// Only charsets whose trail-byte range overlaps the ASCII escape character (0x5C)
+// are listed here. For them, a naïve byte-wise escape that inserts 0x5C before a
+// quote/backslash inside arbitrary binary input can produce a wire sequence where
+// the server lexer eats the inserted 0x5C as the trail byte of a multibyte
+// character, leaving a bare quote that closes the string literal (SQL injection).
+//
+// See for the C reference :
+// https://github.com/mariadb-corporation/mariadb-connector-c/blob/3.4/libmariadb/ma_charset.c
+//
+
+const big5 = {
+  isHead: (b) => b >= 0xa1 && b <= 0xfe,
+  length: (buf, i, n) => {
+    if (i + 1 >= n) return 0;
+    const t = buf[i + 1];
+    return (t >= 0x40 && t <= 0x7e) || (t >= 0xa1 && t <= 0xfe) ? 2 : 0;
+  }
+};
+
+const gbk = {
+  isHead: (b) => b >= 0x81 && b <= 0xfe,
+  length: (buf, i, n) => {
+    if (i + 1 >= n) return 0;
+    const t = buf[i + 1];
+    return (t >= 0x40 && t <= 0x7e) || (t >= 0x80 && t <= 0xfe) ? 2 : 0;
+  }
+};
+
+const sjis = {
+  isHead: (b) => (b >= 0x81 && b <= 0x9f) || (b >= 0xe0 && b <= 0xfc),
+  length: (buf, i, n) => {
+    if (i + 1 >= n) return 0;
+    const t = buf[i + 1];
+    return (t >= 0x40 && t <= 0x7e) || (t >= 0x80 && t <= 0xfc) ? 2 : 0;
+  }
+};
+
+// cp932 shares sjis ranges
+const cp932 = sjis;
+
+const gbOdd = (b) => b >= 0x81 && b <= 0xfe;
+const gbEven2 = (b) => (b >= 0x40 && b <= 0x7e) || (b >= 0x80 && b <= 0xfe);
+const gbEven4 = (b) => b >= 0x30 && b <= 0x39;
+
+const gb18030 = {
+  isHead: gbOdd,
+  length: (buf, i, n) => {
+    if (i + 1 >= n) return 0;
+    if (gbEven2(buf[i + 1])) return 2;
+    if (i + 3 < n && gbEven4(buf[i + 1]) && gbOdd(buf[i + 2]) && gbEven4(buf[i + 3])) {
+      return 4;
+    }
+    return 0;
+  }
+};
+
+const recognizers = {
+  big5: big5,
+  gbk: gbk,
+  sjis: sjis,
+  cp932: cp932,
+  gb18030: gb18030
+};
+
+export const getMbRecognizer = (encoding) => recognizers[encoding] || null;