Pmd2 PKDPX: Difference between revisions

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(Made the PKDPX container page. Its basically a clone of the AT4PX format, but the magic number, and the decompressed length changes.)
 
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[[Category:ROM Hacking]]
[[Category:ROM Hacking]]
[[Category:Technical References]]
[[Category:Technical References]]
The PKDPX format is used as a compressed container for generic data. Unlike its specialized equivalent the [[pmd2_AT4PX|AT4PX]] format, the PKDPX format can contain any kind of data. The format of whatever is contained will vary depending on context, and what file extension the file that contained the PKDPX contained had.
The PKDPX format is used as a compressed container for generic data. Unlike its specialized equivalent the [[pmd2_AT4PX|AT4PX]] format, the PKDPX format can contain any kind of data. The format of whatever is contained will vary depending on context, and what file extension the file that contained the PKDPX container had.
Its content is compressed using a custom compression format dubbed [[pmd2_PX_Compression|PX Compression]] for the lack of a better name.
Its content is compressed using a custom compression format dubbed [[pmd2_PX_Compression|PX Compression]] for the lack of a better name.



Revision as of 04:49, 12 December 2014

The PKDPX format is used as a compressed container for generic data. Unlike its specialized equivalent the AT4PX format, the PKDPX format can contain any kind of data. The format of whatever is contained will vary depending on context, and what file extension the file that contained the PKDPX container had. Its content is compressed using a custom compression format dubbed PX Compression for the lack of a better name.

File Structure

The structure is very simple. A 20 bytes long header followed with the compressed data.

Overview
Offset Length Endianness Type Name Description
0x00 5 big Magic Number The magic number, made of the ASCII characters "PKDPX" {0x50, 0x4B, 0x44, 0x50, 0x58}
0x05 2 little uint16 Container Length The length from the beginning of the header to the end of the compressed data.
0x07 9 byte array Ctrl Flags Array A list of flags to be used in decompressing the container's content. More detail about their purpose on the PX Compression page. They're really nybbles stored in the lower half of a single byte each.
0x10 4 little uint32 Decompressed Data Length This is the length of the raw input data before it was compressed. Note how the length of this field differ from the AT4PX format's own Decompressed Data Length !
0x14 ..The compressed data begins immediately here!..

Credits

A big thanks to Zhorkenwho figured out most of the header and the compression format!