如何使用Linux工具创建压缩dmg文件？
[英]How to create a compressed dmg file using Linux tools?
问题描述
There are a lots of question teaching how to create a DMG file from Linux. 
教授如何从Linux创建DMG文件有很多问题。 But none of them is clear about how to add compression to it. 但是他们都没有清楚如何为它添加压缩。
I usually create a DMG package to redistribute to MacOS, but I would like to add compression as Apple specifies. 我通常创建一个DMG包来重新分配给MacOS，但我想按照Apple的规定添加压缩。
Did anyone have a chance to try a tool that supports compression during DMG packing? 有没有人有机会尝试在DMG包装过程中支持压缩的工具？
Similar questions without compression: 没有压缩的类似问题：
1 个解决方案
解决方案1
1 2018-08-02 22:22:28
It depends. 这取决于。 Here is a good analysis of the .dmg format . 这是对.dmg格式的一个很好的分析 。 From that document, the compression is specified for each block chunk: 从该文档中，为每个块块指定压缩：
Table: DMG blxx types
Type Scheme Meaning
0x00000000 --- Zero-Fill
0x00000001 UDRW/UDRO RAW or NULL compression (uncompressed)
0x00000002 --- Ignored/unknown
0x80000004 UDCO Apple Data Compression (ADC)
0x80000005 UDZO zLib data compression
0x80000006 UDBZ bz2lib data compression
0x7ffffffe --- No blocks - Comment: +beg and +end
0xffffffff --- No blocks - Identifies last blxx entry
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