Replace png encode dependency with optimized CRC32 calculation

package-lock.json

@@ -48,6 +48,7 @@
                 "cookie-parser": "^1.4.6",
                 "cookie-session": "^2.1.0",
                 "cors": "^2.8.5",
+                "crc": "^4.3.2",
                 "csrf-sync": "^4.0.3",
                 "diff-match-patch": "^1.0.5",
                 "dompurify": "^3.2.4",
@@ -76,7 +77,6 @@
                 "node-persist": "^4.0.4",
                 "open": "^8.4.2",
                 "png-chunk-text": "^1.0.0",
-                "png-chunks-encode": "^1.0.0",
                 "png-chunks-extract": "^1.0.0",
                 "proxy-agent": "^6.5.0",
                 "rate-limiter-flexible": "^5.0.5",
@@ -121,7 +121,6 @@
                 "@types/node": "^18.19.80",
                 "@types/node-persist": "^3.1.8",
                 "@types/png-chunk-text": "^1.0.3",
-                "@types/png-chunks-encode": "^1.0.2",
                 "@types/png-chunks-extract": "^1.0.2",
                 "@types/response-time": "^2.3.8",
                 "@types/select2": "^4.0.63",
@@ -2033,13 +2032,6 @@
             "dev": true,
             "license": "MIT"
         },
-        "node_modules/@types/png-chunks-encode": {
-            "version": "1.0.2",
-            "resolved": "https://registry.npmjs.org/@types/png-chunks-encode/-/png-chunks-encode-1.0.2.tgz",
-            "integrity": "sha512-Dxn0aXEcSg1wVeHjvNlygm/+fKBDzWMCdxJYhjGUTeefFW/jYxWcrg+W7ppLBfH44iJMqeVBHtHBwtYQUeYvgw==",
-            "dev": true,
-            "license": "MIT"
-        },
         "node_modules/@types/png-chunks-extract": {
             "version": "1.0.2",
             "resolved": "https://registry.npmjs.org/@types/png-chunks-extract/-/png-chunks-extract-1.0.2.tgz",
@@ -3542,6 +3534,23 @@
                 "node": ">= 0.10"
             }
         },
+        "node_modules/crc": {
+            "version": "4.3.2",
+            "resolved": "https://registry.npmjs.org/crc/-/crc-4.3.2.tgz",
+            "integrity": "sha512-uGDHf4KLLh2zsHa8D8hIQ1H/HtFQhyHrc0uhHBcoKGol/Xnb+MPYfUMw7cvON6ze/GUESTudKayDcJC5HnJv1A==",
+            "license": "MIT",
+            "engines": {
+                "node": ">=12"
+            },
+            "peerDependencies": {
+                "buffer": ">=6.0.3"
+            },
+            "peerDependenciesMeta": {
+                "buffer": {
+                    "optional": true
+                }
+            }
+        },
         "node_modules/crc-32": {
             "version": "0.3.0",
             "resolved": "https://registry.npmjs.org/crc-32/-/crc-32-0.3.0.tgz",
@@ -6686,16 +6695,6 @@
             "integrity": "sha512-DEROKU3SkkLGWNMzru3xPVgxyd48UGuMSZvioErCure6yhOc/pRH2ZV+SEn7nmaf7WNf3NdIpH+UTrRdKyq9Lw==",
             "license": "MIT"
         },
-        "node_modules/png-chunks-encode": {
-            "version": "1.0.0",
-            "resolved": "https://registry.npmjs.org/png-chunks-encode/-/png-chunks-encode-1.0.0.tgz",
-            "integrity": "sha512-J1jcHgbQRsIIgx5wxW9UmCymV3wwn4qCCJl6KYgEU/yHCh/L2Mwq/nMOkRPtmV79TLxRZj5w3tH69pvygFkDqA==",
-            "license": "MIT",
-            "dependencies": {
-                "crc-32": "^0.3.0",
-                "sliced": "^1.0.1"
-            }
-        },
         "node_modules/png-chunks-extract": {
             "version": "1.0.0",
             "resolved": "https://registry.npmjs.org/png-chunks-extract/-/png-chunks-extract-1.0.0.tgz",
@@ -7532,12 +7531,6 @@
             "dev": true,
             "license": "ISC"
         },
-        "node_modules/sliced": {
-            "version": "1.0.1",
-            "resolved": "https://registry.npmjs.org/sliced/-/sliced-1.0.1.tgz",
-            "integrity": "sha512-VZBmZP8WU3sMOZm1bdgTadsQbcscK0UM8oKxKVBs4XAhUo2Xxzm/OFMGBkPusxw9xL3Uy8LrzEqGqJhclsr0yA==",
-            "license": "MIT"
-        },
         "node_modules/slidetoggle": {
             "version": "4.0.0",
             "resolved": "https://registry.npmjs.org/slidetoggle/-/slidetoggle-4.0.0.tgz",

package.json

@@ -38,6 +38,7 @@
         "cookie-parser": "^1.4.6",
         "cookie-session": "^2.1.0",
         "cors": "^2.8.5",
+        "crc": "^4.3.2",
         "csrf-sync": "^4.0.3",
         "diff-match-patch": "^1.0.5",
         "dompurify": "^3.2.4",
@@ -66,7 +67,6 @@
         "node-persist": "^4.0.4",
         "open": "^8.4.2",
         "png-chunk-text": "^1.0.0",
-        "png-chunks-encode": "^1.0.0",
         "png-chunks-extract": "^1.0.0",
         "proxy-agent": "^6.5.0",
         "rate-limiter-flexible": "^5.0.5",
@@ -151,7 +151,6 @@
         "@types/node": "^18.19.80",
         "@types/node-persist": "^3.1.8",
         "@types/png-chunk-text": "^1.0.3",
-        "@types/png-chunks-encode": "^1.0.2",
         "@types/png-chunks-extract": "^1.0.2",
         "@types/response-time": "^2.3.8",
         "@types/select2": "^4.0.63",

src/character-card-parser.js

@@ -1,7 +1,7 @@
 import fs from 'node:fs';
 import { Buffer } from 'node:buffer';
 
-import encode from 'png-chunks-encode';
+import encode from './png/encode.js';
 import extract from 'png-chunks-extract';
 import PNGtext from 'png-chunk-text';
 

src/png/encode.js

@@ -0,0 +1,68 @@
+import { crc32 } from 'crc';
+
+/**
+ * Encodes PNG chunks into a PNG file format buffer.
+ * @param {Array<{ name: string; data: Uint8Array }>} chunks Array of PNG chunks
+ * @returns {Uint8Array} Encoded PNG data
+ * @copyright Based on https://github.com/hughsk/png-chunks-encode (MIT)
+ */
+export default function encode(chunks) {
+    const uint8 = new Uint8Array(4);
+    const int32 = new Int32Array(uint8.buffer);
+    const uint32 = new Uint32Array(uint8.buffer);
+
+    let totalSize = 8;
+    let idx = totalSize;
+
+    for (let i = 0; i < chunks.length; i++) {
+        totalSize += chunks[i].data.length;
+        totalSize += 12;
+    }
+
+    const output = new Uint8Array(totalSize);
+
+    output[0] = 0x89;
+    output[1] = 0x50;
+    output[2] = 0x4E;
+    output[3] = 0x47;
+    output[4] = 0x0D;
+    output[5] = 0x0A;
+    output[6] = 0x1A;
+    output[7] = 0x0A;
+
+    for (let i = 0; i < chunks.length; i++) {
+        const { name, data } = chunks[i];
+        const size = data.length;
+        const nameChars = [
+            name.charCodeAt(0),
+            name.charCodeAt(1),
+            name.charCodeAt(2),
+            name.charCodeAt(3),
+        ];
+
+        uint32[0] = size;
+        output[idx++] = uint8[3];
+        output[idx++] = uint8[2];
+        output[idx++] = uint8[1];
+        output[idx++] = uint8[0];
+
+        output[idx++] = nameChars[0];
+        output[idx++] = nameChars[1];
+        output[idx++] = nameChars[2];
+        output[idx++] = nameChars[3];
+
+        for (let j = 0; j < size;) {
+            output[idx++] = data[j++];
+        }
+
+        const crc = crc32(data, crc32(new Uint8Array(nameChars)));
+
+        int32[0] = crc;
+        output[idx++] = uint8[3];
+        output[idx++] = uint8[2];
+        output[idx++] = uint8[1];
+        output[idx++] = uint8[0];
+    }
+
+    return output;
+}