The Header

The header consists of a record (tppuheader) containing several pieces of information for recompilation. This is shown in table Anatomy of a unit file. The header is always stored in little-endian format.

PPU Header

offset	size (bytes)	description
00h	3	Magic : ’PPU’ in ASCII
03h	3	PPU File format version (e.g : ’021’ in ASCII)
06h	2	Compiler version used to compile this module (major,minor)
08h	2	Code module target processor
0Ah	2	Code module target operating system
0Ch	4	Flags for PPU file
10h	4	Size of PPU file (without header)
14h	4	CRC-32 of the entire PPU file
18h	4	CRC-32 of partial data of PPU file (public data mostly)
1Ch	8	Reserved

The header is already read by the ppufile.openfile command. You can access all fields using ppufile.header which holds the current header record.

PPU CPU Field values

value	description
0	unknown
1	Intel 80x86 or compatible
2	Motorola 680x0 or compatible
3	Alpha AXP or compatible
4	PowerPC or compatible

Some of the possible flags in the header are described in table Anatomy of a unit file. Not all the flags are described, for more information, read the source code of ppu.pas.

PPU Header Flag values

Symbolic bit flag name	Description
uf_init	Module has an initialization (either Delphi or TP style) section.
uf_finalize	Module has a finalization section.
uf_big_endian	All the data stored in the chunks is in big-endian format.
uf_has_browser	Unit contains symbol browser information.
uf_smart_linked	The code module has been smartlinked.
uf_static_linked	The code is statically linked.
uf_has_resources	Unit has resource section.