CRAP File Format

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《城市：天际线》使用名为“Colossal Raw Asset Package (.crp)”的内部文件格式来存储各种数据。本文件旨在对文件格式进行深入的技术解释。

CRP Header

This is the start of any .crp file.

Type		Description
byte[4]	CRP File Signature.	Equal to "CRAP"
uint16	File format version	Currently equals 6.
pstr	Package name	Encoded using UTF-8.
pstr	Author Name	The package author's name, encrypted. TODO
uint32	Package version	TODO
pstr	Main Asset Name	A string representing the title of the main asset in this package. Encoded using UTF-8.
uint32	File Count	The number of files contained in this package.
uint64	Data Offset	The location in this file where the file data starts. This is added to each file's individual offset, and is usually right after the end of the crp header.
asset_entry[file_count]	Asset Entires	A list of asset entries. The length of this list is defined by the File Count above.

Following the CRP header and until the end of file exists space where each asset file resides.

Asset Entry

Much like a ZIP archive file, the CRP header contains meta data about each individual file, such as it's name and offset, for efficient file seeking and reading.

Type		Description
pstr	Name	Name of the asset file. Encoded using UTF-8.
pstr	Checksum	The asset's checksum, encoded in ASCII hexadecimal. TODO.
uint32	Type	This determines what type of asset this is, and how it should be parsed. See the Asset Types table below.
uint64	Offset	The offset, in number of bytes, of where this asset is located in the CRP. This is added to the offset in the CRP header.
uint64	Size	The size of the file, in bytes.

Additional asset metadata is located at the beginning of the file's data.

Asset Types

Value	Description
1	Object
2	Material
3	Texture
4	Static Mesh
50	Text
51	Assembly
52	Data
53	Package
80	Locale
100	User
101	Save Game
102	Custom Map
103	Custom Asset
104	Color Correction (LUT)
105	District Style
106	Map Theme
107	Map Theme Map
108	Scenario

说明

本文内容长期有效，适用任何游戏版本。

本页内容最初译自官方Wiki:CRAP File Format，经双方编辑后内容可能与来源不同。