diff options
Diffstat (limited to 'node_modules/@webassemblyjs/utf8/src/decoder.js')
-rw-r--r-- | node_modules/@webassemblyjs/utf8/src/decoder.js | 86 |
1 files changed, 0 insertions, 86 deletions
diff --git a/node_modules/@webassemblyjs/utf8/src/decoder.js b/node_modules/@webassemblyjs/utf8/src/decoder.js deleted file mode 100644 index 227ba3a..0000000 --- a/node_modules/@webassemblyjs/utf8/src/decoder.js +++ /dev/null @@ -1,86 +0,0 @@ -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"); -} |