RGZ

This document describes the RGZ file format used in the Ragnarok Online client.

Contents

RGZ files are gzip-compressed patch files used to update GRF archives.

Layout

Each RGZ archive contains an array of file and directory entries that should be applied to the GRF:

Field	Offset	Length	Type	Description
EntryType	0	1	char	Directory entry ('d'), end-of-file symbol ('e'), or file entry ('f')
FileNameLength	1	1	uint8	Length of the file name (string) that follows
FileName	2	variable	string	Null-terminated, but at most FileNameLength bytes (with encoding: CP949)
FileSize	variable	variable	uint32	File entries only: Length of the file contents (blob) that follows
FileContents	variable	variable	blob	Only present for file entries; otherwise skip this field

This structure is repeated until the EOF entry 'e' with name "end" is encountered, which must always be the final entry.

See also

• Description of the RGZ format (rAthena Wiki)