2.2.2.5 EIGHT_BYTE_UNSIGNED_INTEGER

The EIGHT_BYTE_UNSIGNED_INTEGER structure is used to encode a value in the range 0x0000000000000000 to 0x1FFFFFFFFFFFFFFF by using a variable number of bytes. For example, 0x001A1B1C1D1E1F2A is encoded as {0xDA, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x2A}. The three most significant bits of the first byte encode the number of bytes in the structure.


0


1


2


3


4


5


6


7


8


9

1
0


1


2


3


4


5


6


7


8


9

2
0


1


2


3


4


5


6


7


8


9

3
0


1

c

val1

val2 (optional)

val3 (optional)

val4 (optional)

val5 (optional)

val6 (optional)

val7 (optional)

val8 (optional)

c (3 bits): A 3-bit unsigned integer field containing an encoded representation of the number of bytes in this structure.

Value

Meaning

ONE_BYTE_VAL

0

Implies that the optional val2, val3, val4, val5, val6, val7 and val8 fields are not present. Hence, the structure is 1 byte in size.

TWO_BYTE_VAL

1

Implies that the optional val2 field is present, while the optional val3, val4, val5, val6, val7 and val8 fields are not present. Hence, the structure is 2 bytes in size.

THREE_BYTE_VAL

2

Implies that the optional val2 and val3 fields are present, while the optional val4, val5, val6, val7 and val8 fields are not present. Hence, the structure is 3 bytes in size.

FOUR_BYTE_VAL

3

Implies that the optional val2, val3, and val4 fields are all present, while the optional val5, val6, val7 and val8 fields are not present. Hence, the structure is 4 bytes in size.

FIVE_BYTE_VAL

4

Implies that the optional val2, val3, val4 and val5 fields are all present, while the optional val6, val7 and val8 fields are not present. Hence, the structure is 5 bytes in size.

SIX_BYTE_VAL

5

Implies that the optional val2, val3, val4, val5 and val6 fields are all present, while the optional val7 and val8 fields are not present. Hence, the structure is 6 bytes in size.

SEVEN_BYTE_VAL

6

Implies that the optional val2, val3, val4, val5, val6 and val7 fields are all present, while the optional val8 field is not present. Hence, the structure is 7 bytes in size.

EIGHT_BYTE_VAL

7

Implies that the optional val2, val3, val4, val5, val6, val7 and val8 fields are all present. Hence, the structure is 8 bytes in size.

val1 (5 bits): A 5-bit unsigned integer field containing the most significant 5 bits of the value represented by this structure.

val2 (1 byte, optional): An 8-bit unsigned integer containing the second most significant bits of the value represented by this structure.

val3 (1 byte, optional): An 8-bit unsigned integer containing the third most significant bits of the value represented by this structure.

val4 (1 byte, optional): An 8-bit unsigned integer containing the fourth most significant bits of the value represented by this structure.

val5 (1 byte, optional): An 8-bit unsigned integer containing the fifth most significant bits of the value represented by this structure.

val6 (1 byte, optional): An 8-bit unsigned integer containing the sixth most significant bits of the value represented by this structure.

val7 (1 byte, optional): An 8-bit unsigned integer containing the seventh most significant bits of the value represented by this structure.

val8 (1 byte, optional): An 8-bit unsigned integer containing the least significant bits of the value represented by this structure.