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node_modules/@jsonjoy.com/buffers/lib/utf8/isUtf8.js

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+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.isUtf8 = void 0;
+/**
+ * Validates that the given data is valid UTF-8 text.
+ * @param buf Data to check.
+ * @returns True if the data is valid UTF-8.
+ */
+const isUtf8 = (buf, from, length) => {
+    const to = from + length;
+    while (from < to) {
+        const c = buf[from];
+        if (c <= 0x7f) {
+            from++;
+            continue;
+        }
+        if (c >= 0xc2 && c <= 0xdf) {
+            if (buf[from + 1] >> 6 === 2) {
+                from += 2;
+                continue;
+            }
+            else
+                return false;
+        }
+        const c1 = buf[from + 1];
+        if (((c === 0xe0 && c1 >= 0xa0 && c1 <= 0xbf) || (c === 0xed && c1 >= 0x80 && c1 <= 0x9f)) &&
+            buf[from + 2] >> 6 === 2) {
+            from += 3;
+            continue;
+        }
+        if (((c >= 0xe1 && c <= 0xec) || (c >= 0xee && c <= 0xef)) && c1 >> 6 === 2 && buf[from + 2] >> 6 === 2) {
+            from += 3;
+            continue;
+        }
+        if (((c === 0xf0 && c1 >= 0x90 && c1 <= 0xbf) ||
+            (c >= 0xf1 && c <= 0xf3 && c1 >> 6 === 2) ||
+            (c === 0xf4 && c1 >= 0x80 && c1 <= 0x8f)) &&
+            buf[from + 2] >> 6 === 2 &&
+            buf[from + 3] >> 6 === 2) {
+            from += 4;
+            continue;
+        }
+        return false;
+    }
+    return true;
+};
+exports.isUtf8 = isUtf8;
+//# sourceMappingURL=isUtf8.js.map