feat: remove empty hex

Author: Tsuk1ko

src/classes/sprite.ts

@@ -47,7 +47,7 @@ export class Sprite extends AssetBase {
       r.align(4);
     }
     if (version[0] >= 2017) {
-      this.renderDataKey = bufferToHex(r.readBuffer(16 + 8));
+      this.renderDataKey = bufferToHex(r.readBuffer(24), true);
       this.atlasTags = r.readAlignedStringArray();
       this.spriteAtlas = new PPtr(this.__info, r);
     }

src/classes/spriteAtlas.ts

@@ -33,7 +33,7 @@ export class SpriteAtlas extends AssetBase {
 
     const renderDataMapSize = r.readUInt32();
     for (let i = 0; i < renderDataMapSize; i++) {
-      const key = bufferToHex(r.readBuffer(16 + 8));
+      const key = bufferToHex(r.readBuffer(24), true);
       const data = new SpriteAtlasData(this.__info, r);
       this.renderDataMap.set(key, data);
     }

src/utils/buffer.ts

@@ -17,8 +17,11 @@ export const hexToUInt8Array = (hex: string) => {
   return new Uint8Array((hex.match(/[\da-f]{2}/gi) || []).map(h => parseInt(h, 16)));
 };
 
-export const bufferToHex = (buffer: ArrayBuffer) =>
-  [...new Uint8Array(buffer)].map(x => x.toString(16).padStart(2, '0')).join('');
+export const bufferToHex = (buffer: ArrayBuffer, allZeroToEmpty = false) => {
+  const arr = [...new Uint8Array(buffer)];
+  if (allZeroToEmpty && arr.every(v => !v)) return '';
+  return arr.map(x => x.toString(16).padStart(2, '0')).join('');
+};
 
 export const bufferToString = (data: AllowSharedBufferSource, encoding?: string) =>
   new TextDecoder(encoding).decode(data);