塞班(Symbian)安装文件.SISX文件格式说明

原文地址:http://homepage.ntlworld.com/thouky/software/psifs/sis.html

 

用于分析SISX文件格式,解压SISX文件,压缩SISX文件,程序自动打包S60安装程序等.

 

 

SIS File Format

Version 1.18, 19-Dec-07
by Alexander Thoukydides ([e-mail])

 

Copyright © Alexander Thoukydides.
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts and no Back-Cover Texts. A copy of the license is included in the section entitled " GNU Free Documentation License".

Introduction

The EPOC operating system uses files with a .SIS extension to allow easy installation of applications. These are usually produced using the makesis tool, and are handled by either the control panel Add/remove program or EPOC Connect. This document attempts to provide sufficient information to allow other software to be written that can decode and use SIS files.

The format of SIS files was changed in the Symbian OS version 9.1 release of Software Install. This document describes the original format used by earlier versions. Information about the restructured and redesigned format can be found at http://www.symbian.com/developer/techlib/papers/SymbianOSv91/softwareinstallsis.pdf.

The latest version of this document will normally be available from http://www.thouky.co.uk/software/psifs/sis.html.

History

Revision	Date	Author	Description
1.18	19-Dec-07	Alexander Thoukydides	Corrected conditional expression types.
1.17	27-Nov-07	Alexander Thoukydides	Corrected size of the Number of certificates field.
1.16	18-Jul-07	Alexander Thoukydides	Added standard names and other uses for the CRC algorithm.
1.15	03-Feb-07	Alexander Thoukydides	Added note about endianness.
1.14	23-Sep-06	Alexander Thoukydides	Added link to Symbian 9.1 SIS file format documentation.
1.13	07-Jun-06	Alexander Thoukydides	Exclude signature block from calculation of the Checksum field.
1.12	04-Apr-06	Alexander Thoukydides	Corrected description of Original file length field.
1.11	05-May-04	Alexander Thoukydides	Added long option codes.
1.10	04-May-04	Alexander Thoukydides	Added more language and type codes.
1.09	14-Mar-04	Alexander Thoukydides	Added more details of EPOC release 6 format files.
1.08	30-Apr-03	Alexander Thoukydides	Added more details of EPOC release 6 format files.
1.07	08-Jul-01	Alexander Thoukydides	Split the flags field into options and type. Corrected installer version field.
1.06	07-Jul-01	Alexander Thoukydides	Corrected description of requisites with multiple language versions.
1.05	30-Jun-01	Alexander Thoukydides	Added desription of checksum field in the header. Explained calculation of UID4 better.
1.04	27-Jun-01	Alexander Thoukydides	Added flags field to the file header.
1.03	09-Jun-01	Alexander Thoukydides	Added missing languages and clarified some descriptions.
1.02	02-Jun-00	Alexander Thoukydides	Released under version 1.1 of the GNU Free Documentation License.
1.01	21-Apr-00	Alexander Thoukydides	Corrected HTML. Added URL for latest version of this document.
1.00	27-Mar-00	Alexander Thoukydides	First draft.

Disclaimer

This document is supplied "as is"; no warranty, express or implied, of the merchantability of this document or its fitness for any particular purpose is given. In no circumstances shall the author, or any provider or distributor of this document, be liable for any damage, loss of profits, or any indirect or consequential loss arising out of the use or misuse of any information or particular in this document.

All trademarks are acknowledged.

Acknowledgements

The information contained within this document was collated from many different sources, including (but not restricted to):

• Jochen Siegenthaler's document providing a partial description of the SIS file format.
• EPOC C++ SDK, Evaluation Edition.
• Neuon's nSISUtil.
• Analysis of a large selection of existing SIS files.
• Andrew de Quincey's xmakesis Perl script, as updated by Rudolf Koenig.
• Trial and error while developing PsiFS for RISC OS computers.
• Corrections supplied by Dalibor Jelinek, Eberhard Mattes, Neil Masson, Stephanie Freitag, Bruno Tiago Rodrigues, Jimmy Shah, Jordan Walters, David Berry, Ren Yantao, a1z0r, Luca Cassioli, Wellu Mäkinen, Marcio Faustino and Tero Suomela.

Due to the diverse and incomplete nature of these sources, the description here probably contains both errors and omissions. Please send any corrections or additions to the author for inclusion in future revisions.

Sections

SIS files consist of the following sections:

Section
File Header
Language Records
File Records
Requisite Records
Component Name Record
Capabilities Record
Certificates Record
Resource Data

The sections are stored contiguously, without any padding or alignment. They should also normally be in the order listed, otherwise the residual SIS files may be larger than necessary.

Conventions

Unless otherwise specified the following conventions apply:

• Numeric values larger than a byte are stored with the least significant byte first.
• Strings are not terminated; their length is explicitly specified.
• Pointers are specified as offsets from the start of the SIS file.

File Header

All SIS files start with a standard header:

Offset		Bytes	Description
0x00	0	4	UID 1
0x04	4	4	UID 2
0x08	8	4	UID 3
0x0c	12	4	UID 4
0x10	16	2	Checksum
0x12	18	2	Number of languages
0x14	20	2	Number of files
0x16	22	2	Number of requisites
0x18	24	2	Installation language
0x1a	26	2	Installation files
0x1c	28	2	Installation drive
0x1e	30	2	Number of capabilities
0x20	32	4	Installer version
0x24	36	2	Options
0x26	38	2	Type
0x28	40	2	Major version
0x2a	42	2	Minor version
0x2c	44	4	Variant
0x30	48	4	Languages pointer
0x34	52	4	Files pointer
0x38	56	4	Requisites pointer
0x3c	60	4	Certificates pointer
0x40	64	4	Component name pointer

The header of EPOC release 6 format SIS files is extended:

Offset		Bytes	Description
0x44	68	4	Signature pointer
0x48	72	4	Capabilities pointer
0x4C	76	4	Installed space
0x50	80	4	Maximum installed space
0x54	84	16	Reserved

The UID 1, UID 2 and UID 3 fields are the first three words of the file, and indicate the type of data it contains. UID 1 is the UID of the application to be installed, or 0x10000000 if none. UID 2 is 0x1000006D for EPOC releases 3, 4 and 5, and 0x10003A12 for EPOC release 6. UID 3 is always 0x10000419.

UID 4 is a checksum calculated from the preceding fields. The least significant 16 bits are given by the CRC16 of the bytes at even offsets from the start of the file, and the most significant 16 bits are given by the CRC16 of the bytes at odd offsets from the start of the file.

The Checksum field is calculated as the CRC16 of all the data in the SIS file excluding the 2 bytes occupied by the Checksum itself and any signature block. It is not updated for the residual SIS file.

The Number of languages and Languages pointer fields specify the number of languages supported by the SIS file and the offset to the languages records respectively.

The Number of files and Files pointer fields specify the number of files included in the SIS file and the offset to the files records respectively.

The Number of requisites and Requisites pointer fields specify the number of requisites specified in the SIS file and the offset to the requisites records respectively.

The Installation language and Installation files fields are both initially zero. When the SIS file is installed, these are modified with the settings used for the installation.

The Installation drive field is initially 0x0000 for EPOC releases 3, 4 and 5, and 0x0021 (the character code for "!") for EPOC release 6. When the SIS file is installed, this is modified with the setting used for the installation.

The Installer version field specifies the version of the Add/remove program required to handle the file. This is normally 68 (0x00000044) or 100 (0x00000064) for EPOC releases 3, 4 and 5, and 200 (0x000000c8) for EPOC release 6.

The Options may combine any of the following flags:

Option	Code		Description
0x0001	IU		IsUnicode (EPOC release 5)
0x0002	ID		IsDistributable (EPOC release 5)
0x0008	NC	NOCOMPRESS	NoCompress (EPOC release 6)
0x0010	SH	SHUTDOWNAPPS	ShutdownApps (EPOC release 6)

The Type may be any of the following:

Type	Code		Description
0x0000	SA	SISAPP	Contains an application (the default)
0x0001	SY	SISSYSTEM	Contains a shared/system component such as a DLL or OPX (EPOC release 6)
0x0002	SO	SISOPTION	Contains an optional component, independently selectable by the user (EPOC release 6)
0x0003	SC	SISCONFIG	Configures an existing application or service (EPOC release 6)
0x0004	SP	SISPATCH	Patches an existing component (EPOC release 6)
0x0005	SU	SISUPGRADE	Upgrades an existing component (EPOC release 6)

The Major version and Minor version fields specify the version number of the application. The Minor version number is padded to two digits with leading zeros for display.

The Variant field is used when the component is a requisite for other components. If more than one variant of the requisite component exists for different machines then this field ensures that the correct variant is present. This is usually set to 0x00000000.

The Certificates pointer specifies the offset to the certificates record.

The Component name pointer field specifies the offset to the component name record.

The Signature pointer field specifies the offset to the signature block.

The Number of capabilities and Capabilities pointer fields specify the number of capabilities specified in the SIS file and the offset to the capabilities record respectively.

The Installed space field is initially 0x00000000. When the SIS file is installed, this is modified with the space used by the installed files.

The Maximum installed space field specifies the maximum space required for installation. This is usually the total size of all the files when uncompressed. If the SIS file contains alternates then the size of the larger alternate is used.

The Reserved field is for use by future revisions of the file format.

Cyclic Redundancy Check

The standard x¹⁶ + x¹² + x⁵ + 1 polynomial is used with an initial remainder of zero to generate a 16 bit CRC. This is the CRC-16-CCITT algorithm (also known as CRC-CCITT), as used by the XMODEM, X.25, V.41, Bluetooth, PPP and IrDA protocols.

The following C code calculates a lookup table to allow efficient calculation of this CRC:

const unsigned int polynomial = 0x1021; unsigned int table[256], index; table[0] = 0; for (index = 0; index < 128; index++) {     unsigned int carry = table[index] & 0x8000;     unsigned int temp = (table[index] << 1) & 0xffff;     table[index * 2 + (carry ? 0 : 1)] = temp ^ polynomial;     table[index * 2 + (carry ? 1 : 0)] = temp; }

The following line can then be used to add a byte (value) to a 16 bit CRC (old_crc) to give the new 16 bit CRC (new_crc):

new_crc = (old_crc << 8) ^ table[((old_crc >> 8) ^ value) & 0xff];

The CRC value should be initialised to 0 before any bytes are processed. It may be necessary to use unsigned values to prevent implementation dependant problems on systems with 16 bit integers.

Language Records

The Languages pointer field in the header points to the language records that specify which languages are supported by the SIS file. The Number of languages field in the header specifies the number of records. Each record consists of a 2 byte value from the following table:

Language		Code	Description
0x0000	0		Test
0x0001	1	EN	UK English
0x0002	2	FR	French
0x0003	3	GE	German
0x0004	4	SP	Spanish
0x0005	5	IT	Italian
0x0006	6	SW	Swedish
0x0007	7	DA	Danish
0x0008	8	NO	Norwegian
0x0009	9	FI	Finnish
0x000A	10	AM	American English
0x000B	11	SF	Swiss French
0x000C	12	SG	Swiss German
0x000D	13	PO	Portuguese
0x000E	14	TU	Turkish
0x000F	15	IC	Icelandic
0x0010	16	RU	Russian
0x0011	17	HU	Hungarian
0x0012	18	DU	Dutch
0x0013	19	BL	Belgian Flemish
0x0014	20	AU	Australian English
0x0015	21	BG	Belgian French
0x0016	22	AS	Austrian German
0x0017	23	NZ	New Zealand English
0x0018	24	IF	International French
0x0019	25	CS	Czech
0x001A	26	SK	Slovak
0x001B	27	PL	Polish
0x001C	28	SL	Slovenian
0x001D	29	TC	Taiwan Chinese
0x001E	30	HK	Hong Kong Chinese
0x001F	31	ZH	PRC Chinese
0x0020	32	JA	Japanese
0x0021	33	TH	Thai
0x0022	34	AF	Afrikaans
0x0023	35	SQ	Albanian
0x0024	36	AH	Amharic
0x0025	37	AR	Arabic
0x0026	38	HY	Armenian
0x0027	39	TL	Tagalog
0x0028	40	BE	Belarussian
0x0029	41	BN	Bengali
0x002A	42	BG	Bulgarian
0x002B	43	MY	Burmese
0x002C	44	CA	Catalan
0x002D	45	HR	Croatian
0x002E	46	CE	Canadian English
0x002F	47	IE	International English
0x0030	48	SF	South African English
0x0031	49	ET	Estonian
0x0032	50	FA	Farsi
0x0033	51	CF	Canadian French
0x0034	52	GD	Scots Gaelic
0x0035	53	KA	Georgian
0x0036	54	EL	Greek
0x0037	55	CG	Cyprus Greek
0x0038	56	GU	Gujarati
0x0039	57	HE	Hebrew
0x003A	58	HI	Hindi
0x003B	59	IN	Indonesian
0x003C	60	GA	Irish
0x003D	61	SZ	Swiss Italian
0x003E	62	KN	Kannada
0x003F	63	KK	Kazakh
0x0040	64	KM	Khmer
0x0041	65	KO	Korean
0x0042	66	LO	Laothian
0x0043	67	LV	Latvian
0x0044	68	LT	Lithuanian
0x0045	69	MK	Macedonian
0x0046	70	MS	Malay
0x0047	71	ML	Malayalam
0x0048	72	MR	Marathi
0x0049	73	MO	Moldavian
0x004A	74	MN	Mongolian
0x004B	75	NN	Norwegian-Nynorsk
0x004C	76	BP	Brazilian Portuguese
0x004D	77	PA	Punjabi
0x004E	78	RO	Romanian
0x004F	79	SR	Serbian
0x0050	80	SI	Sinhalese
0x0051	81	SO	Somali
0x0052	82	OS	International Spanish
0x0053	83	LS	Latin American Spanish
0x0054	84	SH	Swahili
0x0055	85	FS	Finland Swedish
0x0057	87	TA	Tamil
0x0058	88	TE	Telugu
0x0059	89	BO	Tibetan
0x005A	90	TI	Tigrinya
0x005B	91	CT	Cyprus Turkish
0x005C	92	TK	Turkmen
0x005D	93	UK	Ukrainian
0x005E	94	UR	Urdu
0x0060	96	VI	Vietnamese
0x0061	97	CY	Welsh
0x0062	98	ZU	Zulu

Note that SF is used for both Swiss French and South African English.

File Records

The Files pointer field in the header points to the file records that specify the details of the files to be installed. The Number of Files field in the header specifies the number of records. These are stored contiguously, in the reverse of the order required for installation. Each record starts with a 4 byte File record type field specifying the type of record that follows:

Type	Description
0x00000000	Simple file line
0x00000001	Multiple language files line
0x00000002	Options line
0x00000003	If line
0x00000004	ElseIf line
0x00000005	Else line
0x00000006	EndIf line

Simple File or Multiple Language Files Line Record

If the File record type field at the start of the record is 0x00000000 or 0x00000001 then the record specifies a single file to be installed. It is in the following format:

Offset		Bytes	Description
0x00	0	4	File record type
0x04	4	4	File type
0x08	8	4	File details
0x0c	12	4	Source name length
0x10	16	4	Source name pointer
0x14	20	4	Destination name length
0x18	24	4	Destination name pointer
0x1c	28	4n	File length(s)
0x1c + 4n	28 + 4n	4n	File pointer(s)

The file records of EPOC release 6 format SIS files are extended:

Offset		Bytes	Description
0x1c + 8n	28 + 8n	4n	Original file length(s)
0x1c + 12n	28 + 12n	4	MIME type length
0x20 + 12n	32 + 12n	4	MIME type pointer

The File type consists of one of the following types:

File type		Code		Description
0x00	0	FF	FILE	Standard file (the default)
0x01	1	FT	FILETEXT	Text file to display during installation
0x02	2			SIS component file
0x03	3	FR	FILERUN	File to be run during installation and/or removal
0x04	4	FN	FILENULL	File does not yet exist, but will be created when the application is run
0x05	5	FM	FILEMIME	Open file

The File details give extra information for the specified File type.

If the File type identifies a standard file (FF) then the file is installed on the target machine and File details is always 0x00000000.

If the File type identifies a text file (FT) then the file is not installed; it is just displayed during installation. The buttons to use are specified by the File details field:

File details		Code		Description
0x0000	0	TC	TEXTCONTINUE	Continue (continue installation)
0x0001	1	TS	TEXTSKIP	Yes (continue installation), No (skip next file)
0x0002	2	TA	TEXTABORT	Yes (continue installation), No (abort installation)
0x0003	3	TE	TEXTEXIT	Yes (continue installation), No (abort and undo installation)

If the File type identifies a SIS component file then the SIS component is installed, and File details is set to the UID of the application that the SIS file installs. Pointers within component SIS files are specified as offsets from the start of that file. Component SIS files are usually used for components that may be shared between multiple applications; they ensure that existing installations are not overwritten by earlier versions.

If the File type identifies a file to be run (FR) then it is installed on the target machine, and the File details field specifies when it should be run:

File details		Code	Description
0x0000	0	RI	RUNINSTALL	Run during installation only
0x0001	1	RR	RUNREMOVE	Run during removal only
0x0002	2	RB	RUNBOTH	Run during both installation and removal
0x0100	256	RE	RUNSENDEND	Close when installation complete
0x0200	512	RW		Wait until closed before continuing

If the File type field identifies a file that does not yet exist (FN) then the file will be created by the running application, and will be deleted when the application is removed. Note that the file will not be deleted when upgrading to a later version, ensuring that application preferences are not lost in an upgrade. The File details are always 0x00000000.

If the File type field identifies a file to open (FM) then the file will be opened during installation using the application associated with the MIME type, and the File details field specifies when it should be run:

File details		Code	Description
0x0100	256	OC	Close when installation complete
0x0200	512	OW	Wait until closed before continuing

The Source name length and Source name pointer specify the length and offset of the source filename respectively. This is the path of the original file on the machine used to construct the SIS file; it does not affect the installation or removal process. The name is usually blank if the File type field identifies a file that does not yet exist (FN).

The Destination name length and Destination name pointer specify the length and offset of the target filename respectively. The drive letter may be specified as an exclamation mark ("!") to allow a choice of drive during installation. The name is usually blank if the File type field identifies a text file (FT).

The File length and File pointer specify the length and offset of the file contents respectively. The Original file length specifies the size of the file when uncompressed. If the File record type field specifies that there are multiple language versions, then the File length, File pointer and Original file length fields are individually repeated for each language version supported by the SIS file. These are specified in the same order as the language records.

Unless the NC option is set in the header, file data in EPOC release 6 format files is compressed using zlib's compress method.

The MIME type length and MIME type pointer fields specify the length and offset of the file's MIME type. If the file does not have a MIME type then the MIME type length field is set to 0x00000000 and the MIME type pointer field specifies the offset to the first byte after the end of the source and target filenames.

Options Line Record

If the File record type field at the start of the record is 0x00000002 then the record specifies selectable installation options. It has the following format:

Offset		Bytes	Description
0x00	0	4	File record type
0x04	4	4	Number of options
0x08	8	8mn	Option strings
0x08 + 8mn	8 + 8mn	16	Selected options

The Number of options field specifies the number of options defined by the Options strings field. Each option consists of a record in the following form:

Offset		Bytes	Description
0x00	0	4n	Option string length(s)
4n	4n	4n	Option string pointer(s)

The Option string length and Option string pointer specify the length and offset of the option description respectively. The Option string length and Option string pointer fields are individually repeated for each language version supported by the SIS file. These are specified in the same order as the language records.

The Selected options field is a bitmap with one bit for each of up to 128 options. Initially all bits are set, but when the SIS file is installed this is modified to record the selected options.

Options are displayed to the user at the stage of the installation at which they appear within the SIS file. They behave as global attributes (affecting embedded SIS files) and are tested within If and ElseIf line records. The attributes corresponding to option n is identified by 0x2000+n.

If or ElseIf Line Record

If the File record type field at the start of the record is 0x00000003 or 0x00000004 then the record specifies a conditional record in the following format:

Offset		Bytes	Description
0x00	0	4	File record type
0x04	4	4	Size of conditional expression
0x08	8	n	Conditional expression

The Size of conditional expression field specifies the size of the following Conditional expression.

The Conditional expression if recursively constructed from records that start with a Conditional type field:

Type	Description
0x00000000	(Attribute) = (Value)
0x00000001	(Attribute) <> (Value)
0x00000002	(Attribute) > (Value)
0x00000003	(Attribute) < (Value)
0x00000004	(Attribute) >= (Value)
0x00000005	(Attribute) <= (Value)
0x00000006	(Conditional expression) AND (Conditional expression)
0x00000007	(Conditional expression) OR (Conditional expression)
0x00000008	exists(Filename)
0x00000009	devcap(Capability)
0x0000000a	appcap(UID, Capability)
0x0000000b	NOT(Conditional expression)
0x0000000c	String
0x0000000d	Attribute
0x0000000e	Number

If the Conditional type is 0x00000000 to 0x00000007 or 0x0000000a then it specifies a binary operator applied to two sub-expressions (each recursively constructed as for Conditional expression):

Offset		Bytes	Description
0x00	0	4	Conditional type
0x04	4	n	Left-hand side conditional sub-expression
0x04 + n	4 + n	m	Right-hand side conditional sub-expression

The two sub-expressions for Conditional type 0x0000000a are always numbers (Conditional type 0x0000000e).

If the Conditional type is 0x00000008, 0x00000009 or 0x0000000b then it specifies a unary operator applied to a sub-expression (recursively constructed as for Conditional expression):

Offset		Bytes	Description
0x00	0	4	Conditional type
0x04	4	n	Conditional sub-expression

The sub-expression for Conditional type 0x00000008 is always a string (Conditional type 0x0000000c), and the sub-expression for Conditional type 0x00000009 is always a number (Conditional type 0x0000000e).

If the Conditional type is 0x0000000c then it specifies a string:

Offset		Bytes	Description
0x00	0	4	Conditional type
0x04	4	4	String length
0x08	8	4	String pointer

If the Conditional type is 0x0000000d then it specifies an attribute:

Offset		Bytes	Description
0x00	0	4	Conditional type
0x04	4	4	Attribute
0x08	8	4	Unused

The Attribute may be one of the following:

Flag	Code	Description
0x00000000	Manufacturer	0=Ericsson, 1=Motorola, 2=Nokia, 3=Panasonic, 4=Psion, 5=Intel, 6=Cogent, 7=Cirrus, etc
0x00000001	ManufacturerHardwareRev	0x0100 = 1.00 (manufacturer specific)
0x00000002	ManufacturerSoftwareRev	0x0100 = 1.00 (manufacturer specific)
0x00000003	ManufacturerSoftwareBuild	(manufacturer specific)
0x00000004	Model
0x00000005	MachineUid	Device specific values for products as defined in epoc32/include/hal_data.h
0x00000006	DeviceFamily	0=Crystal, 1=Pearl, 2=Quartz
0x00000007	DeviceFamilyRev	0x0100 = 1.00
0x00000008	CPU	0=ARM, 1=MCORE, 2=x86
0x00000009	CPUArch	0x400=ARM4, 0x410=ARM4T, 0x500=ARM5, 0x300=M340
0x0000000a	CPUABI	0=ARM4, 1=ARMI, 2=THUMB, 3=MCORE, 4=MSVC
0x0000000b	CPUSpeed	CPU clock speed / 1024, e.g. 36864=36MHz
0x0000000e	SystemTickPeriod	Tick period in microseconds
	SystemSpeed	Approximate speed relative to Psion Series 5 = 100
0x0000000f	MemoryRAM	Total RAM size in bytes
0x00000010	MemoryRAMFree	Free RAM size in bytes
0x00000011	MemoryROM	Total ROM size
0x00000012	MemoryPageSize	Size of memory management unit pages
0x00000015	PowerBackup	0=none, 1=supported
0x00000018	Keyboard	0=none, 1=keypad, 2=full, 3=both
0x00000019	KeyboardDeviceKeys	Number of device specific keys
0x0000001a	KeyboardAppKeys	Number of application keys
0x0000001b	KeyboardClick	0=none, 1=supported
0x0000001e	KeyboardClickVolumeMax
0x0000001f	DisplayXPixels	Screen width in pixels
0x00000020	DisplayYPixels	Screen height in pixels
0x00000021	DisplayXTwips	Screen width in twips (1/1440 inch)
0x00000022	DisplayYTwips	Screen height in twips (1/1440 inch)
0x00000023	DisplayColors	2, 4, 16, 256, 65536, etc
0x00000026	DisplayContrastMax
0x00000027	Backlight	0=none, 1=supported
0x00000029	Pen	0=none, 1=supported
0x0000002a	PenX	Pen horizontal resolution
0x0000002b	PenY	Pen vertical resolution
0x0000002c	PenDisplayOn	0=no 1=yes
0x0000002d	PenClick	0=none, 1=supported
0x00000030	PenClickVolumeMax
0x00000031	Mouse	0=none, 1=supported
0x00000032	MouseX	Mouse horizontal resolution
0x00000033	MouseY	Mouse vertical resolution
0x00000037	MouseButtons	Number of mouse buttons
0x0000003a	CaseSwitch	0=none, 1=supported
0x0000003d	LEDs	Number of LEDs
0x0000003f	IntegratedPhone	0=none, 1=supported
0x00000041	DisplayBrightnessMax
0x00000042	KeyboardBacklightState
0x00000043	AccessoryPower
0x00000059	NumHalAttributes	Number of supported HAL attributes
0x00001000	Language	Machine language
0x00001001	RemoteInstall	0=Symbian OS based install, 1=installation via a PC
0x00002000 + n	Option<n>	0=option not selected, 1=option selected

If the Conditional type is 0x0000000e then it specifies a number:

Offset		Bytes	Description
0x00	0	4	Conditional type
0x04	4	4	Number
0x08	8	4	Unused

Else or EndIf Line Record

If the File record type field at the start of the record is 0x00000005 or 0x00000006 then the record consists of just the type field:

Offset		Bytes	Description
0x00	0	4	File record type

Requisite Records

The Requisites pointer field in the header points to the requisites records that specify the files that are required by the component being installed. The Number of requisites field in the header specifies the number of records. These are stored contiguously in the following format:

Offset		Bytes	Description
0x00	0	4	UID
0x04	4	2	Major version
0x06	6	2	Minor version
0x08	8	4	Variant
0x0c	12	4n	Requisite name length(s)
0x0c + 4n	12 + 4n	4n	Requisite name pointer(s)

The UID field specifies the UID of the component that is required, i.e. the first word of its residual SIS file.

The Major version and Minor version fields specify the minimum version number of the component required. The Minor version number is padded to two digits with leading zeros for display. This is not checked by the control panel Add/remove program.

The Variant field specifies the variant of the component that is required. This is usually set to 0x00000000, and is not checked by the control panel Add/remove program.

The Requisite name length and Requisite name pointer specify the length and offset of the requite name respectively. The Requisite name length and Requisite name pointer fields are individually repeated for each language version supported by the SIS file. These are specified in the same order as the language records.

The requisite name is only used for display during installation; it does not need to match for the requisite to be satisfied.

Component Name Record

The Component name pointer field in the header points to the component name record that specifies the name of the component to be installed. This is used both during installation and for the list of installed applications in the control panel Add/remove program. The record is in the following format:

Offset		Bytes	Description
0x00	0	4n	Name length(s)
4n	4n	4n	Name pointer(s)

The Name length and Name pointer specify the length and offset of the component name respectively. The Name length and Name pointer fields are individually repeated for each language version supported by the SIS file. These are specified in the same order as the language records.

Capabilities Record

The Capabilities pointer field in the header points to the capabilities record. The record is in the following format:

Offset		Bytes	Description
0x00	0	4n	Key
4n	4n	4n	Value

 

Certificates Record

The Certificates pointer field in the header points to the certificates records. The record is in the following format:

Offset		Bytes	Description
0x00	0	2	Year
0x02	2	2	Month
0x04	4	2	Day
0x06	6	2	Hour
0x08	8	2	Minute
0x0A	10	2	Second
0x0C	12	4	Number of certificates

The Year, Month, Day, Hour, Minute and Second fields form a timestamp.

The Number of certificates field specifies the number of certificates.

Resource Data

The remainder of the SIS file consists of the data referenced from the other sections. This is stored uncompressed and unpadded, usually in the following order:

Section
String Block, containing: File Names Requisite Name Component Name
Code Block
Signature Block

If, for some reason, the resource data is arranged with the code block (containing the file data) before the component name, then the residual SIS file will be larger than necessary.

Installation

Installation of an SIS file requires several steps to be performed. These are described in the following sections.

These operations need to be repeated for any embedded component SIS files.

Select Language

SIS files may support more than one language, as indicated by the Number of languages field in the header and the language records. The control panel Add/remove program attempts to use the current language of the machine, but EPOC Connect prompts the user to choose from the available options.

Check Requisites

The requisite records specify a list of other components that need to be installed. The residual SIS files on the target machine should be searched to verify that a suitable version of the required component has been installed.

Check Previous Version

The residual SIS files on the target machine are used to check for any previous versions of the application being installed. Any previous installation needs to be removed before installing the new version.

If the previous version is older than the version being installed then it is replaced without warning. However, if the previous version is newer then the behaviour depends on the installation program; the control panel Add/remove program requires the user to first uninstall the more recent version, but EPOC Connect displays a confirmation prompt to allow the existing application to be removed and replaced.

Copy Files

The file records should be processed in the reverse of the order that they are stored in the SIS file. Text files should be displayed and component SIS files installed as they are encountered.

SIS files sometimes allow the user to select the installation drive. This is indicated by the destination file names having an exclamation mark ("!") specified as the drive letter. In this case the user should be prompted to select from the available drives.

Directories should be created automatically to accommodate files being copied.

Residual SIS File

A residual SIS file is created in the C:/System/Install/ directory on the target machine. This allows the control panel to display a list of installed programs, and provides the dependency information required for removing the component or installing other applications.

The main modification is that the file is truncated after the file name and component name strings. This usually means that the file data is omitted, but this relies upon the SIS file contents being in a sensible order.

Finally, three fields in the header are modified with the settings used for the installation. The Installation language field is set to the language selected for the installation, the Installation files field is set to the number of files installed, and the Installation drive field is set to the drive letter where the files were installed.

Removal

Removing an application consists of deleting all the files listed within the residual SIS file. This includes any component SIS files and the residual SIS file itself.

Before a component is removed, all other residual SIS files need to be checked to verify that it is not required by another application. When uninstallation of a component involves the removal of another component's requisite files, the user is warned that continuing may prevent other programs from working.

If the application is being removed to allow a newer version to be installed then files with a File type field indicating a file created by the application (FN) should not be removed.

Partial Installation

If an installation or removal is aborted, the Installation files field is set to the number of files that are left installed. The control panel Add/remove program marks any such installations as "Partial" in the list of installed applications, and offers options to either resume the installation or to uninstall the application.