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87 lines
3.3 KiB
Markdown
87 lines
3.3 KiB
Markdown
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# Stuffit 5 format
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All intergers are big-endians.
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## Archive header
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| **Offset** | **Length** | **Contents** |
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|:-----------|:-----------|:-------------|
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| 000 | 80 bytes | Magic string (always `StuffIt (c)1997-???? Aladdin Systems, Inc., http://www.aladdinsys.com/StuffIt/` followed by `0x0D` `0x0A`, where characters marked `?` can vary) |
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| 080 | Half | Unknown |
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| 082 | Byte | Version (always `5`) |
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| 083 | Byte | Flags (`0x80` = encrypted) |
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| 084 | Word | Total size of archive |
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| 088 | Word | Unknown |
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| 092 | Half | Number of entries in root directory |
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| 094 | Word | Offset of first entry in root directory |
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| 098 | Half | Header CRC-16? |
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| 100 | ? | Unknown data until first entry |
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## Entry header
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### Base header for file and folder
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Both file and folder headers start with the following header.
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| **Offset** | **Length** | **Contents** |
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|:-----------|:-----------|:-------------|
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| 00 | Word | Magic number (always `0xA5A5A5A5`) |
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| 04 | Byte | Version |
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| 05 | Byte | Unknown (but certainly `0x00`) |
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| 06 | Half | Header size |
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| 08 | Byte | Unknown |
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| 09 | Byte | Entry flags/type |
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| 10 | Word | Creation date (Mac OS format) |
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| 14 | Word | Modification date (Mac OS format) |
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| 18 | Word | Offset of previous entry |
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| 22 | Word | Offset of next entry |
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| 26 | Word | Offset of directory entry |
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| 30 | Half | Name size (called **N** after) |
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| 32 | Half | Header CRC-16 |
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### File specific header
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A file (when `flags` doesn't contain `0x40`) continues with the following header.
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| **Offset** | **Length** | **Contents** |
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|:-----------|:-----------|:-------------|
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| 34 | Word | Data fork uncompressed length |
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| 38 | Word | Data fork compressed length |
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| 42 | Half | Data fork CRC-16 (Set to zero for method 15) |
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| 44 | Half | Unknown |
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| 46 | Byte | Data fork compression method (only `0`, `13` or `15`) |
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| 47 | Byte | Password data lenght (called **M** after) |
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| 48 | **M** | Password information |
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| 48+**M** | **N** | Filename |
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| 48+**M**+**N** | **K** | Comment size (called **K** after) |
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| 48 | **N** | Filename |
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| 48 | **N** | Filename |
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### Folder specific header
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A folder (when `flags` contains `0x40`) continues with the following header.
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| **Offset** | **Length** | **Contents** |
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|:-----------|:-----------|:-------------|
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| 34 | Word | Offset of first entry in folder |
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| 38 | Word | Size of complete directory |
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| 42 | Word | Unknown |
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| 46 | Half | Number of files in folder |
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| 48 | **N** | Folder name |
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| 48+**N** | ? | Unknown data until next entry |
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Note: if the offset of first entry is `0xFFFFFFFF`, this folder must be skiped
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after reading 48 bytes of header (the usefulness of these folders is unclear).
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---------------------------
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**Sources**
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https://github.com/mietek/theunarchiver/wiki/StuffIt5Format
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https://github.com/mietek/theunarchiver/blob/master/XADMaster/XADStuffIt5Parser.m#L29
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