@ivujs/i-utils
Version:
前端模块化 JavaScript 工具库
386 lines (369 loc) • 11.1 kB
JavaScript
;
/*
* [hi-base32]{@link https://github.com/emn178/hi-base32}
*
* @version 0.5.0
* @author Chen, Yi-Cyuan [emn178@gmail.com]
* @copyright Chen, Yi-Cyuan 2015-2018
* @license MIT
*/
/* jslint bitwise: true */
var root = typeof window === "object" ? window : {};
var NODE_JS = !root.HI_BASE32_NO_NODE_JS && typeof process === "object" && process.versions && process.versions.node;
if (NODE_JS) {
root = global;
}
var BASE32_ENCODE_CHAR = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567".split("");
var BASE32_DECODE_CHAR = {
A: 0,
B: 1,
C: 2,
D: 3,
E: 4,
F: 5,
G: 6,
H: 7,
I: 8,
J: 9,
K: 10,
L: 11,
M: 12,
N: 13,
O: 14,
P: 15,
Q: 16,
R: 17,
S: 18,
T: 19,
U: 20,
V: 21,
W: 22,
X: 23,
Y: 24,
Z: 25,
2: 26,
3: 27,
4: 28,
5: 29,
6: 30,
7: 31,
};
var blocks = [0, 0, 0, 0, 0, 0, 0, 0];
var throwInvalidUtf8 = function (position, partial) {
if (partial.length > 10) {
partial = "..." + partial.substr(-10);
}
var err = new Error(
"Decoded data is not valid UTF-8." +
" Maybe try base32.decode.asBytes()?" +
" Partial data after reading " +
position +
" bytes: " +
partial +
" <-",
);
err.position = position;
throw err;
};
var toUtf8String = function (bytes) {
var str = "",
length = bytes.length,
i = 0,
followingChars = 0,
b,
c;
while (i < length) {
b = bytes[i++];
if (b <= 0x7f) {
str += String.fromCharCode(b);
continue;
} else if (b > 0xbf && b <= 0xdf) {
c = b & 0x1f;
followingChars = 1;
} else if (b <= 0xef) {
c = b & 0x0f;
followingChars = 2;
} else if (b <= 0xf7) {
c = b & 0x07;
followingChars = 3;
} else {
throwInvalidUtf8(i, str);
}
for (var j = 0; j < followingChars; ++j) {
b = bytes[i++];
if (b < 0x80 || b > 0xbf) {
throwInvalidUtf8(i, str);
}
c <<= 6;
c += b & 0x3f;
}
if (c >= 0xd800 && c <= 0xdfff) {
throwInvalidUtf8(i, str);
}
if (c > 0x10ffff) {
throwInvalidUtf8(i, str);
}
if (c <= 0xffff) {
str += String.fromCharCode(c);
} else {
c -= 0x10000;
str += String.fromCharCode((c >> 10) + 0xd800);
str += String.fromCharCode((c & 0x3ff) + 0xdc00);
}
}
return str;
};
var decodeAsBytes = function (base32Str) {
if (base32Str === "") {
return [];
} else if (!/^[A-Z2-7=]+$/.test(base32Str)) {
throw new Error("Invalid base32 characters");
}
base32Str = base32Str.replace(/=/g, "");
var v1,
v2,
v3,
v4,
v5,
v6,
v7,
v8,
bytes = [],
index = 0,
length = base32Str.length;
// 4 char to 3 bytes
for (var i = 0, count = (length >> 3) << 3; i < count; ) {
v1 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v2 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v3 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v4 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v5 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v6 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v7 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v8 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
bytes[index++] = ((v1 << 3) | (v2 >>> 2)) & 255;
bytes[index++] = ((v2 << 6) | (v3 << 1) | (v4 >>> 4)) & 255;
bytes[index++] = ((v4 << 4) | (v5 >>> 1)) & 255;
bytes[index++] = ((v5 << 7) | (v6 << 2) | (v7 >>> 3)) & 255;
bytes[index++] = ((v7 << 5) | v8) & 255;
}
// remain bytes
var remain = length - count;
if (remain === 2) {
v1 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v2 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
bytes[index++] = ((v1 << 3) | (v2 >>> 2)) & 255;
} else if (remain === 4) {
v1 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v2 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v3 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v4 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
bytes[index++] = ((v1 << 3) | (v2 >>> 2)) & 255;
bytes[index++] = ((v2 << 6) | (v3 << 1) | (v4 >>> 4)) & 255;
} else if (remain === 5) {
v1 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v2 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v3 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v4 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v5 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
bytes[index++] = ((v1 << 3) | (v2 >>> 2)) & 255;
bytes[index++] = ((v2 << 6) | (v3 << 1) | (v4 >>> 4)) & 255;
bytes[index++] = ((v4 << 4) | (v5 >>> 1)) & 255;
} else if (remain === 7) {
v1 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v2 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v3 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v4 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v5 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v6 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v7 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
bytes[index++] = ((v1 << 3) | (v2 >>> 2)) & 255;
bytes[index++] = ((v2 << 6) | (v3 << 1) | (v4 >>> 4)) & 255;
bytes[index++] = ((v4 << 4) | (v5 >>> 1)) & 255;
bytes[index++] = ((v5 << 7) | (v6 << 2) | (v7 >>> 3)) & 255;
}
return bytes;
};
var encodeUtf8 = function (str) {
var v1,
v2,
v3,
v4,
v5,
code,
end = false,
base32Str = "",
index = 0,
i,
start = 0,
length = str.length;
if (str === "") {
return base32Str;
}
do {
blocks[0] = blocks[5];
blocks[1] = blocks[6];
blocks[2] = blocks[7];
for (i = start; index < length && i < 5; ++index) {
code = str.charCodeAt(index);
if (code < 0x80) {
blocks[i++] = code;
} else if (code < 0x800) {
blocks[i++] = 0xc0 | (code >> 6);
blocks[i++] = 0x80 | (code & 0x3f);
} else if (code < 0xd800 || code >= 0xe000) {
blocks[i++] = 0xe0 | (code >> 12);
blocks[i++] = 0x80 | ((code >> 6) & 0x3f);
blocks[i++] = 0x80 | (code & 0x3f);
} else {
code = 0x10000 + (((code & 0x3ff) << 10) | (str.charCodeAt(++index) & 0x3ff));
blocks[i++] = 0xf0 | (code >> 18);
blocks[i++] = 0x80 | ((code >> 12) & 0x3f);
blocks[i++] = 0x80 | ((code >> 6) & 0x3f);
blocks[i++] = 0x80 | (code & 0x3f);
}
}
start = i - 5;
if (index === length) {
++index;
}
if (index > length && i < 6) {
end = true;
}
v1 = blocks[0];
if (i > 4) {
v2 = blocks[1];
v3 = blocks[2];
v4 = blocks[3];
v5 = blocks[4];
base32Str +=
BASE32_ENCODE_CHAR[v1 >>> 3] +
BASE32_ENCODE_CHAR[((v1 << 2) | (v2 >>> 6)) & 31] +
BASE32_ENCODE_CHAR[(v2 >>> 1) & 31] +
BASE32_ENCODE_CHAR[((v2 << 4) | (v3 >>> 4)) & 31] +
BASE32_ENCODE_CHAR[((v3 << 1) | (v4 >>> 7)) & 31] +
BASE32_ENCODE_CHAR[(v4 >>> 2) & 31] +
BASE32_ENCODE_CHAR[((v4 << 3) | (v5 >>> 5)) & 31] +
BASE32_ENCODE_CHAR[v5 & 31];
} else if (i === 1) {
base32Str += BASE32_ENCODE_CHAR[v1 >>> 3] + BASE32_ENCODE_CHAR[(v1 << 2) & 31] + "======";
} else if (i === 2) {
v2 = blocks[1];
base32Str +=
BASE32_ENCODE_CHAR[v1 >>> 3] +
BASE32_ENCODE_CHAR[((v1 << 2) | (v2 >>> 6)) & 31] +
BASE32_ENCODE_CHAR[(v2 >>> 1) & 31] +
BASE32_ENCODE_CHAR[(v2 << 4) & 31] +
"====";
} else if (i === 3) {
v2 = blocks[1];
v3 = blocks[2];
base32Str +=
BASE32_ENCODE_CHAR[v1 >>> 3] +
BASE32_ENCODE_CHAR[((v1 << 2) | (v2 >>> 6)) & 31] +
BASE32_ENCODE_CHAR[(v2 >>> 1) & 31] +
BASE32_ENCODE_CHAR[((v2 << 4) | (v3 >>> 4)) & 31] +
BASE32_ENCODE_CHAR[(v3 << 1) & 31] +
"===";
} else {
v2 = blocks[1];
v3 = blocks[2];
v4 = blocks[3];
base32Str +=
BASE32_ENCODE_CHAR[v1 >>> 3] +
BASE32_ENCODE_CHAR[((v1 << 2) | (v2 >>> 6)) & 31] +
BASE32_ENCODE_CHAR[(v2 >>> 1) & 31] +
BASE32_ENCODE_CHAR[((v2 << 4) | (v3 >>> 4)) & 31] +
BASE32_ENCODE_CHAR[((v3 << 1) | (v4 >>> 7)) & 31] +
BASE32_ENCODE_CHAR[(v4 >>> 2) & 31] +
BASE32_ENCODE_CHAR[(v4 << 3) & 31] +
"=";
}
} while (!end);
return base32Str;
};
var encodeBytes = function (bytes) {
var v1,
v2,
v3,
v4,
v5,
base32Str = "",
length = bytes.length;
for (var i = 0, count = parseInt(length / 5) * 5; i < count; ) {
v1 = bytes[i++];
v2 = bytes[i++];
v3 = bytes[i++];
v4 = bytes[i++];
v5 = bytes[i++];
base32Str +=
BASE32_ENCODE_CHAR[v1 >>> 3] +
BASE32_ENCODE_CHAR[((v1 << 2) | (v2 >>> 6)) & 31] +
BASE32_ENCODE_CHAR[(v2 >>> 1) & 31] +
BASE32_ENCODE_CHAR[((v2 << 4) | (v3 >>> 4)) & 31] +
BASE32_ENCODE_CHAR[((v3 << 1) | (v4 >>> 7)) & 31] +
BASE32_ENCODE_CHAR[(v4 >>> 2) & 31] +
BASE32_ENCODE_CHAR[((v4 << 3) | (v5 >>> 5)) & 31] +
BASE32_ENCODE_CHAR[v5 & 31];
}
// remain char
var remain = length - count;
if (remain === 1) {
v1 = bytes[i];
base32Str += BASE32_ENCODE_CHAR[v1 >>> 3] + BASE32_ENCODE_CHAR[(v1 << 2) & 31] + "======";
} else if (remain === 2) {
v1 = bytes[i++];
v2 = bytes[i];
base32Str +=
BASE32_ENCODE_CHAR[v1 >>> 3] +
BASE32_ENCODE_CHAR[((v1 << 2) | (v2 >>> 6)) & 31] +
BASE32_ENCODE_CHAR[(v2 >>> 1) & 31] +
BASE32_ENCODE_CHAR[(v2 << 4) & 31] +
"====";
} else if (remain === 3) {
v1 = bytes[i++];
v2 = bytes[i++];
v3 = bytes[i];
base32Str +=
BASE32_ENCODE_CHAR[v1 >>> 3] +
BASE32_ENCODE_CHAR[((v1 << 2) | (v2 >>> 6)) & 31] +
BASE32_ENCODE_CHAR[(v2 >>> 1) & 31] +
BASE32_ENCODE_CHAR[((v2 << 4) | (v3 >>> 4)) & 31] +
BASE32_ENCODE_CHAR[(v3 << 1) & 31] +
"===";
} else if (remain === 4) {
v1 = bytes[i++];
v2 = bytes[i++];
v3 = bytes[i++];
v4 = bytes[i];
base32Str +=
BASE32_ENCODE_CHAR[v1 >>> 3] +
BASE32_ENCODE_CHAR[((v1 << 2) | (v2 >>> 6)) & 31] +
BASE32_ENCODE_CHAR[(v2 >>> 1) & 31] +
BASE32_ENCODE_CHAR[((v2 << 4) | (v3 >>> 4)) & 31] +
BASE32_ENCODE_CHAR[((v3 << 1) | (v4 >>> 7)) & 31] +
BASE32_ENCODE_CHAR[(v4 >>> 2) & 31] +
BASE32_ENCODE_CHAR[(v4 << 3) & 31] +
"=";
}
return base32Str;
};
var encode = function (input, asciiOnly) {
var notString = typeof input !== "string";
if (notString && input.constructor === ArrayBuffer) {
input = new Uint8Array(input);
}
if (notString) {
return encodeBytes(input);
} else {
return encodeUtf8(input);
}
};
var decode = function (base32Str, asciiOnly) {
{
return toUtf8String(decodeAsBytes(base32Str));
}
};
exports.decode = decode;
exports.decodeAsBytes = decodeAsBytes;
exports.encode = encode;