65 lines
2.4 KiB
JavaScript
65 lines
2.4 KiB
JavaScript
#!/usr/bin/env node
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// 解析 Electron asar 归档：列出所有文件并提取图标/logo/svg/png 相关资源
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// 用法: node extract-asar.js <app.asar 路径> <输出目录>
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const fs = require('fs');
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const path = require('path');
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const asarPath = process.argv[2];
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const outDir = process.argv[3] || 'extracted';
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if (!asarPath) { console.error('usage: node extract-asar.js <app.asar> [outdir]'); process.exit(1); }
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const fd = fs.openSync(asarPath, 'r');
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// 实际布局: [4B: 4][4B: pickleSize][4B: strLen+5][4B: strLen][JSON @16][1B: \0][数据...]
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const head = Buffer.alloc(16);
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fs.readSync(fd, head, 0, 16, 0);
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const pickleSize = head.readUInt32LE(4);
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const strLen = head.readUInt32LE(12);
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console.log('pickleSize:', pickleSize, 'strLen:', strLen);
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const jsonBuf = Buffer.alloc(strLen);
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fs.readSync(fd, jsonBuf, 0, strLen, 16);
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const header = JSON.parse(jsonBuf.toString('utf8'));
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const dataStart = 16 + strLen + 1;
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console.log('dataStart =', dataStart, '\n');
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// 遍历文件树
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const interesting = [];
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const allFiles = [];
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function walk(node, prefix) {
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for (const [name, info] of Object.entries(node.files || {})) {
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const p = prefix ? `${prefix}/${name}` : name;
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if (info.files) { walk(info, p); continue; }
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allFiles.push({ p, size: info.size, offset: info.offset, unpacked: !!info.unpacked });
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const lower = p.toLowerCase();
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if (/(icon|logo|grok|swirl|sparkle|favicon|mark\b|brand|symbol)/.test(lower) && /\.(svg|png|webp|jpg|jpeg|icns|ico)$/.test(lower)) {
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interesting.push({ p, size: info.size, offset: info.offset, unpacked: !!info.unpacked });
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}
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}
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}
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walk(header, '');
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console.log(`总文件数: ${allFiles.length}`);
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console.log(`图标/logo 相关候选: ${interesting.length}\n`);
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for (const f of interesting) {
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console.log(` ${String(f.size).padStart(9)} ${f.p}${f.unpacked ? ' [unpacked]' : ''}`);
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}
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// 提取
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fs.mkdirSync(outDir, { recursive: true });
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let n = 0;
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for (const f of interesting) {
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const out = path.join(outDir, f.p);
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fs.mkdirSync(path.dirname(out), { recursive: true });
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if (f.unpacked) {
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const src = path.join(path.dirname(asarPath) + '.unpacked', f.p);
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if (fs.existsSync(src)) { fs.copyFileSync(src, out); n++; continue; }
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}
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if (f.offset === undefined) continue;
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const buf = Buffer.alloc(f.size);
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fs.readSync(fd, buf, 0, f.size, dataStart + parseInt(f.offset));
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fs.writeFileSync(out, buf);
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n++;
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}
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console.log(`\n已提取 ${n} 个文件到 ${outDir}/`);
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fs.closeSync(fd);
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