mdx-m3-viewer
Version:
A browser WebGL model viewer. Mainly focused on models of the games Warcraft 3 and Starcraft 2.
72 lines • 2.32 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.isWebP = exports.isGif = exports.isJpeg = exports.isPng = void 0;
/**
* Detects if the given object is a PNG source.
*
* PNG starts with [89 50 4E 47 0D 0A 1A 0A]
*/
function isPng(bytes) {
if (bytes instanceof ArrayBuffer) {
bytes = new Uint8Array(bytes);
}
if (bytes instanceof Uint8Array) {
if (bytes[0] === 0x89 && bytes[1] === 0x50 && bytes[2] === 0x4e && bytes[3] === 0x47 && bytes[4] === 0x0d && bytes[5] === 0x0a && bytes[6] === 0x1a && bytes[7] === 0x0a) {
return true;
}
}
return false;
}
exports.isPng = isPng;
/**
* Detects if the given object is a JPG source.
*
* JPG starts with [FF D8] and ends with [FF D9]
*/
function isJpeg(bytes) {
if (bytes instanceof ArrayBuffer) {
bytes = new Uint8Array(bytes);
}
if (bytes instanceof Uint8Array) {
if (bytes[0] === 0xff && bytes[1] === 0xd8 && bytes[bytes.length - 2] === 0xff && bytes[bytes.length - 1] === 0xd9) {
return true;
}
}
return false;
}
exports.isJpeg = isJpeg;
/**
* Detects if the given object is a GIF source.
*
* GIF starts with [47 49 46 38 37 61] or [47 49 46 38 39 61]
*/
function isGif(bytes) {
if (bytes instanceof ArrayBuffer) {
bytes = new Uint8Array(bytes);
}
if (bytes instanceof Uint8Array) {
if (bytes[0] === 0x47 && bytes[1] === 0x49 && bytes[2] === 0x46 && bytes[3] === 0x38 && (bytes[4] === 0x37 || bytes[4] === 0x39) && bytes[5] === 0x61) {
return true;
}
}
return false;
}
exports.isGif = isGif;
/**
* Detects if the given object is a WebP source.
*
* WebP starts with [52 49 46 46] followed by the file size - 8 followed by [57 45 42 50]
*/
function isWebP(bytes) {
if (bytes instanceof ArrayBuffer) {
bytes = new Uint8Array(bytes);
}
if (bytes instanceof Uint8Array) {
if (bytes[0] === 0x52 && bytes[1] === 0x49 && bytes[2] === 0x46 && bytes[3] === 0x46 && bytes[8] === 0x57 && bytes[9] === 0x45 && bytes[10] === 0x42 && bytes[11] === 0x50) {
return true;
}
}
return false;
}
exports.isWebP = isWebP;
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