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author | 2020-11-16 00:10:28 +0100 | |
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committer | 2020-11-16 00:10:28 +0100 | |
commit | e06ec920f7a5d784e674c4c4b4e6d1da3dc7391d (patch) | |
tree | 55713f725f77b44ebfec86e4eec3ce33e71458ca /node_modules/@webassemblyjs/utf8/src | |
download | website_creator-e06ec920f7a5d784e674c4c4b4e6d1da3dc7391d.tar.gz website_creator-e06ec920f7a5d784e674c4c4b4e6d1da3dc7391d.tar.bz2 website_creator-e06ec920f7a5d784e674c4c4b4e6d1da3dc7391d.zip |
api, login, auth
Diffstat (limited to 'node_modules/@webassemblyjs/utf8/src')
-rw-r--r-- | node_modules/@webassemblyjs/utf8/src/decoder.js | 86 | ||||
-rw-r--r-- | node_modules/@webassemblyjs/utf8/src/encoder.js | 44 | ||||
-rw-r--r-- | node_modules/@webassemblyjs/utf8/src/index.js | 4 |
3 files changed, 134 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 0000000..227ba3a --- /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"); +} diff --git a/node_modules/@webassemblyjs/utf8/src/encoder.js b/node_modules/@webassemblyjs/utf8/src/encoder.js new file mode 100644 index 0000000..1c482f0 --- /dev/null +++ b/node_modules/@webassemblyjs/utf8/src/encoder.js @@ -0,0 +1,44 @@ +function con(n) { + return 0x80 | (n & 0x3f); +} + +export function encode(str) { + const arr = str.split("").map(x => x.charCodeAt(0)); + return _encode(arr); +} + +function _encode(arr) { + if (arr.length === 0) { + return []; + } + + const [n, ...ns] = arr; + + if (n < 0) { + throw new Error("utf8"); + } + + if (n < 0x80) { + return [n, ..._encode(ns)]; + } + + if (n < 0x800) { + return [0xc0 | (n >>> 6), con(n), ..._encode(ns)]; + } + + if (n < 0x10000) { + return [0xe0 | (n >>> 12), con(n >>> 6), con(n), ..._encode(ns)]; + } + + if (n < 0x110000) { + return [ + 0xf0 | (n >>> 18), + con(n >>> 12), + con(n >>> 6), + con(n), + ..._encode(ns) + ]; + } + + throw new Error("utf8"); +} diff --git a/node_modules/@webassemblyjs/utf8/src/index.js b/node_modules/@webassemblyjs/utf8/src/index.js new file mode 100644 index 0000000..82cf9a7 --- /dev/null +++ b/node_modules/@webassemblyjs/utf8/src/index.js @@ -0,0 +1,4 @@ +// @flow + +export { decode } from "./decoder"; +export { encode } from "./encoder"; |