[epub] 打包一个epub文件

 

Packing an EPUB file is more specific than just creating a ZIP archive. Because EPUB is a standard, it has a strict internal structure and a specific "first-file" rule that must be followed for the file to be valid. 

Here is how to pack your EPUB manually or using tools.

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1. The "Magic" Rules for EPUB

To pass validation, your EPUB must meet these three conditions:

• The mimetype file must be first: It must be the very first file in the ZIP archive.

• No compression on mimetype: The mimetype file must be stored (0% compression), while everything else can be compressed.

• No extra fields: The mimetype file cannot have any extra ZIP headers or "hidden" metadata.

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2. Using Command Line

This is the most reliable way to ensure the mimetype is handled correctly. Open your terminal/command prompt inside your book's root folder.

On macOS / Linux

Run these two commands in order:

1. Pack the mimetype (uncompressed):

   zip -0Xq mybook.epub mimetype

2. Pack everything else (compressed):

   zip -9rXq mybook.epub * -x mimetype

(Note: -0 means no compression; -X excludes extra file attributes like .DS_Store.)