diff options
Diffstat (limited to 'node_modules/@webassemblyjs/utf8/esm/decoder.js')
-rw-r--r-- | node_modules/@webassemblyjs/utf8/esm/decoder.js | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/node_modules/@webassemblyjs/utf8/esm/decoder.js b/node_modules/@webassemblyjs/utf8/esm/decoder.js new file mode 100644 index 0000000..12d88eb --- /dev/null +++ b/node_modules/@webassemblyjs/utf8/esm/decoder.js @@ -0,0 +1,95 @@ +function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } else { return Array.from(arr); } } + +function _toArray(arr) { return Array.isArray(arr) ? arr : Array.from(arr); } + +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(function (x) { + return String.fromCharCode(x); + }).join(""); +} + +function _decode(bytes) { + if (bytes.length === 0) { + return []; + } + /** + * 1 byte + */ + + + { + var _bytes = _toArray(bytes), + b1 = _bytes[0], + bs = _bytes.slice(1); + + if (b1 < 0x80) { + return [code(0x0, b1)].concat(_toConsumableArray(_decode(bs))); + } + + if (b1 < 0xc0) { + throw new Error("invalid UTF-8 encoding"); + } + } + /** + * 2 bytes + */ + + { + var _bytes2 = _toArray(bytes), + _b = _bytes2[0], + b2 = _bytes2[1], + _bs = _bytes2.slice(2); + + if (_b < 0xe0) { + return [code(0x80, ((_b & 0x1f) << 6) + con(b2))].concat(_toConsumableArray(_decode(_bs))); + } + } + /** + * 3 bytes + */ + + { + var _bytes3 = _toArray(bytes), + _b2 = _bytes3[0], + _b3 = _bytes3[1], + b3 = _bytes3[2], + _bs2 = _bytes3.slice(3); + + if (_b2 < 0xf0) { + return [code(0x800, ((_b2 & 0x0f) << 12) + (con(_b3) << 6) + con(b3))].concat(_toConsumableArray(_decode(_bs2))); + } + } + /** + * 4 bytes + */ + + { + var _bytes4 = _toArray(bytes), + _b4 = _bytes4[0], + _b5 = _bytes4[1], + _b6 = _bytes4[2], + b4 = _bytes4[3], + _bs3 = _bytes4.slice(4); + + if (_b4 < 0xf8) { + return [code(0x10000, (((_b4 & 0x07) << 18) + con(_b5) << 12) + (con(_b6) << 6) + con(b4))].concat(_toConsumableArray(_decode(_bs3))); + } + } + throw new Error("invalid UTF-8 encoding"); +}
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