molstar
Version:
A comprehensive macromolecular library.
131 lines • 4.54 kB
JavaScript
;
/**
* Copyright (c) 2017-2020 mol* contributors, licensed under MIT, See LICENSE file for more info.
*
* Adapted from https://github.com/rcsb/mmtf-javascript
* @author Alexander Rose <alexander.rose@weirdbyte.de>
* @author David Sehnal <david.sehnal@gmail.com>
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.utf8ByteCount = exports.utf8Read = exports.utf8Write = void 0;
function utf8Write(data, offset, str) {
for (var i = 0, l = str.length; i < l; i++) {
var codePoint = str.charCodeAt(i);
// One byte of UTF-8
if (codePoint < 0x80) {
data[offset++] = codePoint >>> 0 & 0x7f | 0x00;
continue;
}
// Two bytes of UTF-8
if (codePoint < 0x800) {
data[offset++] = codePoint >>> 6 & 0x1f | 0xc0;
data[offset++] = codePoint >>> 0 & 0x3f | 0x80;
continue;
}
// Three bytes of UTF-8.
if (codePoint < 0x10000) {
data[offset++] = codePoint >>> 12 & 0x0f | 0xe0;
data[offset++] = codePoint >>> 6 & 0x3f | 0x80;
data[offset++] = codePoint >>> 0 & 0x3f | 0x80;
continue;
}
// Four bytes of UTF-8
if (codePoint < 0x110000) {
data[offset++] = codePoint >>> 18 & 0x07 | 0xf0;
data[offset++] = codePoint >>> 12 & 0x3f | 0x80;
data[offset++] = codePoint >>> 6 & 0x3f | 0x80;
data[offset++] = codePoint >>> 0 & 0x3f | 0x80;
continue;
}
throw new Error('bad codepoint ' + codePoint);
}
}
exports.utf8Write = utf8Write;
var __chars = function () {
var data = [];
for (var i = 0; i < 1024; i++)
data[i] = String.fromCharCode(i);
return data;
}();
function throwError(err) {
throw new Error(err);
}
function _utf8Read(data, offset, length) {
var chars = __chars;
var str = void 0, chunkOffset = 0;
var chunk = [], chunkSize = 512;
for (var i = offset, end = offset + length; i < end; i++) {
var byte = data[i];
if ((byte & 0x80) === 0x00) {
// One byte character
chunk[chunkOffset++] = chars[byte];
}
else if ((byte & 0xe0) === 0xc0) {
// Two byte character
chunk[chunkOffset++] = chars[((byte & 0x0f) << 6) | (data[++i] & 0x3f)];
}
else if ((byte & 0xf0) === 0xe0) {
// Three byte character
chunk[chunkOffset++] = String.fromCharCode(((byte & 0x0f) << 12) |
((data[++i] & 0x3f) << 6) |
((data[++i] & 0x3f) << 0));
}
else if ((byte & 0xf8) === 0xf0) {
// Four byte character
chunk[chunkOffset++] = String.fromCharCode(((byte & 0x07) << 18) |
((data[++i] & 0x3f) << 12) |
((data[++i] & 0x3f) << 6) |
((data[++i] & 0x3f) << 0));
}
else
throwError('Invalid byte ' + byte.toString(16));
if (chunkOffset === chunkSize) {
str = str || [];
str[str.length] = chunk.join('');
chunkOffset = 0;
}
}
if (!str)
return chunk.slice(0, chunkOffset).join('');
if (chunkOffset > 0) {
str[str.length] = chunk.slice(0, chunkOffset).join('');
}
return str.join('');
}
var utf8Decoder = (typeof TextDecoder !== 'undefined') ? new TextDecoder() : undefined;
function utf8Read(data, offset, length) {
if (utf8Decoder) {
var input = (offset || length !== data.length) ? data.subarray(offset, offset + length) : data;
return utf8Decoder.decode(input);
}
else {
return _utf8Read(data, offset, length);
}
}
exports.utf8Read = utf8Read;
function utf8ByteCount(str) {
var count = 0;
for (var i = 0, l = str.length; i < l; i++) {
var codePoint = str.charCodeAt(i);
if (codePoint < 0x80) {
count += 1;
continue;
}
if (codePoint < 0x800) {
count += 2;
continue;
}
if (codePoint < 0x10000) {
count += 3;
continue;
}
if (codePoint < 0x110000) {
count += 4;
continue;
}
throwError('bad codepoint ' + codePoint);
}
return count;
}
exports.utf8ByteCount = utf8ByteCount;
//# sourceMappingURL=utf8.js.map