switch to vuepress

1 files changed, 86 insertions, 0 deletions

diff --git a/node_modules/@webassemblyjs/utf8/src/decoder.js b/node_modules/@webassemblyjs/utf8/src/decoder.js
new file mode 100644
index 00000000..227ba3ad
--- /dev/null
+++ b/node_modules/@webassemblyjs/utf8/src/decoder.js
@@ -0,0 +1,86 @@
+function con(b) {
+  if ((b & 0xc0) === 0x80) {
+    return b & 0x3f;
+  } else {
+    throw new Error("invalid UTF-8 encoding");
+  }
+}
+
+function code(min, n) {
+  if (n < min || (0xd800 <= n && n < 0xe000) || n >= 0x10000) {
+    throw new Error("invalid UTF-8 encoding");
+  } else {
+    return n;
+  }
+}
+
+export function decode(bytes) {
+  return _decode(bytes)
+    .map(x => String.fromCharCode(x))
+    .join("");
+}
+
+function _decode(bytes) {
+  if (bytes.length === 0) {
+    return [];
+  }
+
+  /**
+   * 1 byte
+   */
+  {
+    const [b1, ...bs] = bytes;
+
+    if (b1 < 0x80) {
+      return [code(0x0, b1), ..._decode(bs)];
+    }
+
+    if (b1 < 0xc0) {
+      throw new Error("invalid UTF-8 encoding");
+    }
+  }
+
+  /**
+   * 2 bytes
+   */
+  {
+    const [b1, b2, ...bs] = bytes;
+
+    if (b1 < 0xe0) {
+      return [code(0x80, ((b1 & 0x1f) << 6) + con(b2)), ..._decode(bs)];
+    }
+  }
+
+  /**
+   * 3 bytes
+   */
+  {
+    const [b1, b2, b3, ...bs] = bytes;
+
+    if (b1 < 0xf0) {
+      return [
+        code(0x800, ((b1 & 0x0f) << 12) + (con(b2) << 6) + con(b3)),
+        ..._decode(bs)
+      ];
+    }
+  }
+
+  /**
+   * 4 bytes
+   */
+  {
+    const [b1, b2, b3, b4, ...bs] = bytes;
+
+    if (b1 < 0xf8) {
+      return [
+        code(
+          0x10000,
+          ((((b1 & 0x07) << 18) + con(b2)) << 12) + (con(b3) << 6) + con(b4)
+        ),
+        ..._decode(bs)
+      ];
+    }
+  }
+
+  throw new Error("invalid UTF-8 encoding");
+}