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Let's look one more time at the output of our `ShowHII` application:
```
FS0:\> ShowHII.efi
PackageList[0]: GUID=A487A478-51EF-48AA-8794-7BEE2A0562F1; size=0x1ADC
Package[0]: type=STRINGS; size=0x1AC4
Package[1]: type=END; size=0x4
PackageList[1]: GUID=19618BCE-55AE-09C6-37E9-4CE04084C7A1; size=0x21E4
Package[0]: type=STRINGS; size=0x21CC
Package[1]: type=END; size=0x4
PackageList[2]: GUID=2F30DA26-F51B-4B6F-85C4-31873C281BCA; size=0xA93
Package[0]: type=STRINGS; size=0xA7B
Package[1]: type=END; size=0x4
PackageList[3]: GUID=F74D20EE-37E7-48FC-97F7-9B1047749C69; size=0x2EE9
Package[0]: type=IMAGES; size=0x2ED1
Package[1]: type=END; size=0x4
PackageList[4]: GUID=EBF8ED7C-0DD1-4787-84F1-F48D537DCACF; size=0x46C
Package[0]: type=FORMS; size=0x82
Package[1]: type=FORMS; size=0x82
Package[2]: type=STRINGS; size=0x199
Package[3]: type=STRINGS; size=0x19B
Package[4]: type=DEVICE_PATH; size=0x1C
Package[5]: type=END; size=0x4
PackageList[5]: GUID=FE561596-E6BF-41A6-8376-C72B719874D0; size=0x93F
Package[0]: type=FORMS; size=0xF5
Package[1]: type=STRINGS; size=0x40A
Package[2]: type=STRINGS; size=0x40C
Package[3]: type=DEVICE_PATH; size=0x1C
Package[4]: type=END; size=0x4
PackageList[6]: GUID=2A46715F-3581-4A55-8E73-2B769AAA30C5; size=0x6B0
Package[0]: type=FORMS; size=0x143
Package[1]: type=STRINGS; size=0x539
Package[2]: type=DEVICE_PATH; size=0x1C
Package[3]: type=END; size=0x4
PackageList[7]: GUID=99FDC8FD-849B-4EBA-AD13-FB9699C90A4D; size=0x6FE
Package[0]: type=STRINGS; size=0x340
Package[1]: type=STRINGS; size=0x3A6
Package[2]: type=END; size=0x4
PackageList[8]: GUID=E38C1029-E38F-45B9-8F0D-E2E60BC9B262; size=0x15DA
Package[0]: type=STRINGS; size=0xA88
Package[1]: type=STRINGS; size=0xB3A
Package[2]: type=END; size=0x4
PackageList[9]: GUID=D9DCC5DF-4007-435E-9098-8970935504B2; size=0x855
Package[0]: type=FORMS; size=0x1F6
Package[1]: type=STRINGS; size=0x62B
Package[2]: type=DEVICE_PATH; size=0x1C
Package[3]: type=END; size=0x4
PackageList[10]: GUID=F5F219D3-7006-4648-AC8D-D61DFB7BC6AD; size=0x14EC
Package[0]: type=SIMPLE_FONTS; size=0x14D4
Package[1]: type=END; size=0x4
PackageList[11]: GUID=4B47D616-A8D6-4552-9D44-CCAD2E0F4CF9; size=0x6AC8
Package[0]: type=FORMS; size=0x1030
Package[1]: type=STRINGS; size=0x3C99
Package[2]: type=STRINGS; size=0x1DCB
Package[3]: type=DEVICE_PATH; size=0x1C
Package[4]: type=END; size=0x4
PackageList[12]: GUID=F95A7CCC-4C55-4426-A7B4-DC8961950BAE; size=0x13909
Package[0]: type=STRINGS; size=0x138F1
Package[1]: type=END; size=0x4
PackageList[13]: GUID=DEC5DAA4-6781-4820-9C63-A7B0E4F1DB31; size=0x8677
Package[0]: type=STRINGS; size=0x865F
Package[1]: type=END; size=0x4
PackageList[14]: GUID=4344558D-4EF9-4725-B1E4-3376E8D6974F; size=0x83BD
Package[0]: type=STRINGS; size=0x83A5
Package[1]: type=END; size=0x4
PackageList[15]: GUID=0AF0B742-63EC-45BD-8DB6-71AD7F2FE8E8; size=0xCB04
Package[0]: type=STRINGS; size=0xCAEC
Package[1]: type=END; size=0x4
PackageList[16]: GUID=25F200AA-D3CB-470A-BF51-E7D162D22E6F; size=0x1D3D7
Package[0]: type=STRINGS; size=0x1D3BF
Package[1]: type=END; size=0x4
PackageList[17]: GUID=5F5F605D-1583-4A2D-A6B2-EB12DAB4A2B6; size=0x3048
Package[0]: type=STRINGS; size=0x3030
Package[1]: type=END; size=0x4
PackageList[18]: GUID=F3D301BB-F4A5-45A8-B0B7-FA999C6237AE; size=0x26B5
Package[0]: type=STRINGS; size=0x269D
Package[1]: type=END; size=0x4
PackageList[19]: GUID=7C04A583-9E3E-4F1C-AD65-E05268D0B4D1; size=0x5CB
Package[0]: type=STRINGS; size=0x5B3
Package[1]: type=END; size=0x4
```
From this output you can see that each Package list contains one or more data packages and ends with a special `END` package.
Ordinary package contains `EFI_HII_PACKAGE_HEADER` and data content. But the `END` package is simply a `EFI_HII_PACKAGE_HEADER` with a `Type` field set to `EFI_HII_PACKAGE_END`.
Just in case here are prototypes for the header structures once again:
```
typedef struct {
EFI_GUID PackageListGuid;
UINT32 PackagLength;
} EFI_HII_PACKAGE_LIST_HEADER;
typedef struct {
UINT32 Length:24;
UINT32 Type:8;
UINT8 Data[ … ];
} EFI_HII_PACKAGE_HEADER;
```
So basically package list data here looks something like this:
Ordinary packages can be of different types. In this lesson we would look at the string package.
# String package
String package is a set of strings in one language. Each of the strings in package can be referred by ID. IDs to these strings are not written anywhere but it is supposed that numbering scheme simply starts from ID=1 in every string package and increases by 1 on every string [there are some exceptions, but it is not important now].
The general idea is to create String packages for each language you want to support for these piece of interface. In every of these language string packages the same words should have the same ID. For example:
```
String package (ENG) String package (FR)
___________________ ___________________
ID=1 ... ...
... ...
ID=5 Hello! Bonjour!
... ...
```
In the code strings from the Package list are received from the `(ID, language)` combination. This helps to create UIs that could switch translations easily.
# String package content
String package strarts with a header `EFI_HII_STRING_PACKAGE_HDR` and then contains so called `String blocks`, which can be of different types. And as with the package list, the last element (=String block) has special `END` type.
The most important and most common type of String block is UCS2 String block. It contains header which points String block type and a CHAR16 string as a block data. Basically String package is a set of UCS2 String blocks each of which contains one string.
# Create String package
```
Prototype:
typedef struct _EFI_HII_STRING_PACKAGE_HDR {
EFI_HII_PACKAGE_HEADER Header;
UINT32 HdrSize;
UINT32 StringInfoOffset;
CHAR16 LanguageWindow[16];
EFI_STRING_ID LanguageName;
CHAR8 Language[ … ];
} EFI_HII_STRING_PACKAGE_HDR;
Members:
Header The standard package header, where Header.Type = EFI_HII_PACKAGE_STRINGS.
HdrSize Size of this header.
StringInfoOffset Offset, relative to the start of this header, of the string information.
LanguageWindow Specifies the default values placed in the static and dynamic windows
before processing each SCSU-encoded string.
LanguageName String identifier within the current string package of the full name of the
language specified by Language.
Language The null-terminated ASCII string that specifies the language of the strings in the package.
```
|
