Packfile format for SR4

[[V] Knobby]

Packfile version is now 10 and the descriptor is still 0x51890ACE.

// header for the packfile itself
struct v_packfile_file_data {
	et_uint32		descriptor;		// packfile descriptor used to validate data
	et_uint32		version;		// version number of packfile
	et_uint32		header_checksum;	// checksum of the header(after this field)
	et_uint32		file_size;		// physical size (in bytes) of the source vpp file

	et_uint32		flags;			// packfile flags
	et_uint32		num_files;		// number of files in *data section
	et_uint32		dir_size;		// number of bytes in directory section
	et_uint32		filename_size;		// number of bytes in filename section

	et_uint32		data_size;		// number of uncompressed bytes in data files
	et_uint32		compressed_data_size;	// number of compressed bytes in *data section
};

struct v_packfile_entry_file_data {
	char			*filename;
	et_uint32		start;			// offset from start of v_packfile::data (if data is valid) 
	et_uint32		size;			// file size
	et_uint32		compressed_size;	// compressed file size
	et_uint16		flags;			// flags for this file
	et_uint16		alignment;		// alignment requirement of this file
};

Flag data:

// packfile flags
#define PFF_COMPRESSED		(1<<0)	// packfile data is compressed
#define PFF_CONDENSED		(1<<1)	// packfile data is run together
					// NOTE: the data of multiple files is recieved in a single read

// Packfile entry flags
#define PFEF_COMPRESSED		(1<<0)	// this file is compressed