mdx-m3-viewer
Version:
A browser WebGL model viewer. Mainly focused on models of the games Warcraft 3 and Starcraft 2.
78 lines • 2.18 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.splitUtf8ByteLength = exports.byteLengthUtf8 = exports.encodeUtf8 = exports.decodeUtf8 = void 0;
const decoder = new TextDecoder();
const encoder = new TextEncoder();
/**
* Decode bytes as a UTF8 string.
*/
function decodeUtf8(buffer) {
return decoder.decode(buffer);
}
exports.decodeUtf8 = decodeUtf8;
/**
* Encode a UTF8 string to bytes.
*/
function encodeUtf8(utf8) {
return encoder.encode(utf8);
}
exports.encodeUtf8 = encodeUtf8;
/**
* Get the byte length of a UTF8 string.
*
* @see https://stackoverflow.com/a/23329386
*/
function byteLengthUtf8(str) {
// returns the byte length of an utf8 string
let s = str.length;
for (let i = str.length - 1; i >= 0; i--) {
const code = str.charCodeAt(i);
if (code > 0x7f && code <= 0x7ff)
s++;
else if (code > 0x7ff && code <= 0xffff)
s += 2;
if (code >= 0xDC00 && code <= 0xDFFF)
i--; //trail surrogate
}
return s;
}
exports.byteLengthUtf8 = byteLengthUtf8;
/**
* Splits the given string into an array of strings.
*
* Each string will have a byte length smaller or equal to chunkBytelength when encoded as UTF8.
*
* @see https://stackoverflow.com/a/18729931
*/
function splitUtf8ByteLength(str, chunkBytelength) {
const chunks = [];
let pos = 0;
let bytes = 0;
for (let i = 0, l = str.length; i < l; i++) {
const code = str.charCodeAt(i);
if (code < 0x80) {
bytes += 1;
}
else if (code < 0x800) {
bytes += 2;
}
else if (code < 0xd800 || code >= 0xe000) {
bytes += 3;
}
else {
i++;
bytes += 4;
}
if (bytes >= chunkBytelength - 3) {
chunks.push(str.substr(pos, i));
pos += i;
bytes = 0;
}
}
if (bytes > 0) {
chunks.push(str.substr(pos));
}
return chunks;
}
exports.splitUtf8ByteLength = splitUtf8ByteLength;
//# sourceMappingURL=utf8.js.map