Magic 字节识别器：常见错误与修复方法
实践中真正会出现的失败模式、它们在输出中长什么样，以及具体的修复办法。
使用方法
- 先检查输入编码——多余的字节顺序标记或非 UTF-8 粘贴会在工具运行之前就破坏结果。
- 留意静默截断：如果输出长度是可疑的整数，说明有内容被切掉了。
- 确认你改动的选项正是任务所需；残留的默认值是"结果看似合理却错误"的最常见原因。
- 先用你能手工验证的最小输入重跑，再把真实数据加回去。
示例
The PNG signature followed by the start of its IHDR chunk.
输入
89504E470D0A1A0A0000000D49484452
输出 — 搜索结果
Bytes: 89 50 4E 47 0D 0A 1A 0A ASCII: .PNG.... Detected: PNG image Signature matched: 89504E470D0A1A0A → PNG image Detection is by file signature, not by extension — this is how servers should validate uploads, since a client can rename anything to .png.
运行
说明
Identify a file type from its signature bytes rather than its extension — the safe way to validate uploads.
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