2.2.1.3 Fixed-Length Types

The following specifies groupable data types of fixed length:

FIXED_LEN_VTDATA_GROUPABLE = 
        ( VT_EMPTY                    )  /
        ( VT_NULL                     )  /
        ( VT_I2          WORD         )  /
        ( VT_I4          LONG         )  /
        ( VT_R4          FLOAT        )  /
        ( VT_R8          DOUBLE       )  /
        ( VT_CY          CY           )  /
        ( VT_DATE        DATEVAL      )  /
        ( VT_BOOL        BOOLVAL      )  /
        ( VT_UI1         BYTE         )  / 
        ( VT_DECIMAL     DECIMAL      )

VT_CY: Currency is a fixed-point number with four digits to the right of the decimal point. It is stored in an 8-byte signed integer, scaled by 10,000. The syntax of CY is as follows:
```
CY    = CYLOW CYHI
CYLOW = LONG
CYHI  = ULONG
```
VT_BOOL: A two-byte value that corresponds and encodes two states of true and false. By convention %x00.00, it corresponds to a value of "true". The related definition is as follows:
```
BOOLVAL = %xFF.FF / %x00.00
```
VT_DATE: DATEVAL is a Double, the whole part of which is the number of days since December 30, 1899, and the fractional part is the fraction of a day. For example, the number 2.25 represents the date and time January 1, 1900, at 6:00AM.
```
DATEVAL = DOUBLE
```
DECIMAL:

datatype identifier: VT_DECIMAL

A DECIMAL specifies a decimal value, a number in decimal exponential notation with a fixed precision of 12 bytes. The decimal value is specified according to the following rules:
- The decimal value's sign MUST be negative if the value of the DECIMALSign field is DECIMALNegative, and positive or zero otherwise.
- The decimal value's absolute value is specified by the following formula, in which v is the decimal value, s is the value of DECIMALScale, and m is the value of the mantissa: |v| = 10^(-s)*m
The syntax of DECIMAL is as follows:
```
DECIMAL = 2ZEROBYTE DECIMALScale DECIMALSign DECIMALMantissa
```
DECIMALScale: The exponent of the decimal ranges from 0 to 28.
```
DECIMALScale = BYTE
```

DECIMALSign: Specifies the sign of the decimal value.

DECIMALSign     = DECIMALPositive / DECIMALNegative
DECIMALPositive = %x00
DECIMALNegative = %x80

DECIMALMantissa: A 12-byte, unsigned integer that specifies the mantissa of the decimal value. The range of the mantissa is 0-2^96.
```
DECIMALMantissa = DECIMALHigh DECIMALLow DECIMALMid
```
- DECIMALHigh: The most significant 4 bytes of the mantissa.
```
DECIMALHigh = ULONG
```
- DECIMALLow: The least significant 4 bytes of the mantissa.
```
DECIMALLow = ULONG
```
- DECIMALMid: The middle 4 bytes of the mantissa.
```
DECIMALMid = ULONG
```