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RGZ
An RGZ file is a proprietary compressed archive format used for [Ragnarok]
Online, developed by
Gravity. It is used for
patching the local file system directory, the game client resides in. The
archive mostly contains updated game executable or new background music files.
The extension is always .rgz and might be an abbreviation for
ragnarok+gzip.
File Format
The RGZ archive is a sequential concatenation of files and/or directories
entries, compressed with gzip, much like
tar+gzip archives are.
Each entry inside the archive is defined by following structure:
| Field Offset | Field Size | Field |
|---|---|---|
| 0 | 1 | Entry type (case-sensitive) |
| 1 | 1 | File name field length |
| 2 | ? | File name (zero-terminated) |
The entry type specifies, what kind of data it represents. It can be f
(file), d (directory) or e (end). The file name always denotes
relative position of the file, inside the folder, the archive is patched to.
File
A file entry can store any type of file, up to 232 - 1 Byte (4
GiB - 1 Byte) in length. If the file
is put into a sub-directory, the entire path is assumed to exist. A file entry
always follows a directory entry, that creates the path in advance. The
additional data in the file entry has the following structure:
| Field Offset | Field Size | Field |
|---|---|---|
| 0 | 4 | Data length ([little |
| endian](http://en.wikipedia.org/wiki/Little_endian)) | ||
| 4 | ? | Data |
Directory
Directory entries have no additional data, and create a single directory, not
an entire path. That means if you want to create dir1\dir2 it requires two
entries, one for dir1 and the second for dir2.
End
End entry is the last entry inside the archive, and makes the patcher stop
parsing the archive. The file name for this entry is always end.
Hex Workshop Definition File (ragnarok.hsl)
/********************
*
* Ragnarok Resource files to view and edit
*
*/
#include "standard-types.hsl"
#pragma displayname("Ragnarok GZip") ;
#pragma fileextensions(".rgz") ;
#pragma byteorder(little_endian)
//#pragma maxarray(65536)
#pragma hide()
struct FILESTRUCT
{
BYTE type;
struct tagFILENAME
{
BYTE length;
char string[length];
};
switch (type)
{
case 0x66:
struct FILECONTENTS
{
DWORD length;
blob contents[length];
};
break;
default:
break;
};
};
#pragma show()
struct files
{
struct FILESTRUCT entries[256];
};
Tools
See Also
Related
