ZIP Compressed Archive (.zip)
PKWARE استانداردZIP is an archive file format that supports lossless data compression, allowing multiple files and directories to be packaged into a single transportable container.
تبدیل ZIP به TAR
مبدل رایگان ZIP به TAR درون مرورگر. فایلها را فورا روی دستگاه خود تبدیل کنید.
فشردهسازی آنلاین ZIP
فشردهسازی ۱۰۰٪ خصوصی در مرورگر - فایلها هرگز دستگاه شما را ترک نمیکنند
بررسی و فراداده
سیستمعاملها و تحلیلگرهای فایل، فایلهای ZIP را با بررسی توالی بایتهای دودویی ابتدایی شناسایی میکنند:
امضای هدر در سطح بایت (Magic Bytes)
سیستمعاملها و تحلیلگرهای فایل، فایلهای ZIP را با بررسی توالی بایتهای دودویی ابتدایی شناسایی میکنند:
امضای HEX (آفست 0):
50 4B 03 04نمایش ASCII: PK..
استانداردسازی: PKWARE APPNOTE / ISO/IEC 21320-1
مشخصات فنی
| معماری کانتینر | Archive container combining multiple files with individual compression headers |
| فشردهسازی | Deflate (Method 8), Store (Method 0), BZIP2, LZMA, Zstandard |
| ترتیب بایتها (Endianness) | Little-Endian for all signature headers, CRC32 checks, and sizes |
| فضاهای رنگی | Not applicable (binary container for arbitrary files) |
| کانالها و ساختار | Hierarchical directory structures, metadata streams, and file checksums |
| حداکثر ابعاد | Standard ZIP: 4 GB / 65,535 files; ZIP64: 16 Exabytes / 18 quintillion files |
| شفافیت مشخصات | Not applicable |
| استریمینگ و پیشرونده | Central directory at end of file enables instant listing without decompressing |
ماتریس مقایسه فنی: ZIP در برابر رقبا
| ویژگی فنی | ZIP (فعلی) | 7-Zip (7z) | TAR.GZ | RAR |
|---|---|---|---|---|
| Universal OS Compatibility | 100% native in Windows, macOS, Linux, iOS, Android | Requires 7-Zip or third-party app | Native in Linux/macOS; requires tool in Windows | Requires WinRAR or unrar library |
| Compression Efficiency | Moderate (Deflate algorithm) | Very high (LZMA/LZMA2 algorithm) | Moderate (Deflate over tar) | High (RAR proprietary compression) |
| Solid Archiving | No (each file compressed independently) | Yes (solid blocks boost compression for duplicate text) | Yes (compresses entire tarball) | Yes (optional solid mode) |
| Selective Extraction | Fast instant extraction of any single file | Requires decompressing preceding solid blocks | Must decompress stream up to target file | Fast if non-solid |
حالتهای رایج خرابی و راهنمای بازیابی هگز
⚠️ Archive utility reports 'End-of-central-directory signature not found' or invalid archive.
علت ریشهای: Truncated download missing the final bytes containing the Central Directory record.
بازیابی: Use 'zip -FF damaged.zip --out fixed.zip' to scan local file headers from the beginning and reconstruct a new central directory.
تحلیل امنیتی و بردارهای حمله تجزیهکننده (Parser)
ZIP security centers on Zip Slip path traversal vulnerabilities and decompression bombs.
بردارهای حمله شناختهشده
- Zip Slip: Malicious filenames containing '../../' path traversal escaping the target extraction directory.
- Zip Bomb: Tiny archives that expand into petabytes of zeros (e.g. 42.zip 42 KB expanding to 4.5 PB), crashing servers through disk and memory exhaustion.
- Legacy ZipCrypto encryption vulnerabilities allowing ciphertext-only key recovery in minutes.
بهترین روشهای پدافندی: Always sanitize extraction file paths to ensure they stay within the target folder. Set strict max byte and file count limits when unzipping untrusted uploads. Use WinZip AES-256 encryption.
تاریخچه و نقاط عطف
مزایا و نقاط قوت کلیدی
- Universally supported by every operating system on earth without installing third-party software.
- Central directory located at the end of the archive allows instant file listing without decompressing.
- Individual files can be extracted selectively without decompressing the entire archive.
محدودیتها و معایب فنی
- Does not store UNIX file permissions or symlinks reliably across platforms.
- Non-solid archiving means compression ratio is lower than 7z or tar.xz for large collections of similar files.
- Standard legacy ZipCrypto encryption is cryptographically broken (AES-256 is required).
نکات فنی جالب
- The 'PK' in the ZIP file header stands for Phil Katz, the inventor of PKZIP.
- Almost all modern app formats (Android .apk, Java .jar, Office .docx, e-books .epub) are actually ZIP archives.
سوالات فنی متداول
What is the difference between ZIP and 7Z?
ZIP is universally compatible with every operating system without installing extra software. 7Z uses the modern LZMA/LZMA2 algorithm with solid compression, achieving 30%–50% higher compression ratios but requiring third-party software to open on older systems.
Why is it fast to view the contents of a ZIP file?
ZIP stores a 'Central Directory' at the very end of the file. Software simply reads the last few kilobytes to immediately display the full directory tree and file names without decompressing any files.
جفتهای تبدیل مرتبط با ZIP
Repackage standard ZIP compressed archives into uncompressed POSIX TAR tape archives for UNIX/Linux distributions.
Compress POSIX TAR tape archives into universal ZIP files for Windows, macOS, and mobile cross-platform sharing.
Recompress ZIP archives into high-density 7z (LZMA2) containers to save 30-50% storage space.
Decompress 7z archives into standard ZIP format for native extraction on Windows and macOS without third-party software.