2.2.2.2.1.2.1.2 Two-Byte Unsigned Encoding (TWO_BYTE_UNSIGNED_ENCODING)
The TWO_BYTE_UNSIGNED_ENCODING structure is used to encode a value in the range 0x0000 to 0x7FFF by using a variable number of bytes. For example, 0x1A1B is encoded as { 0x9A, 0x1B }. The most significant bit of the first byte encodes the number of bytes in the structure.
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c |
val1 |
val2 (optional) |
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c (1 bit): A 1-bit, unsigned integer field that contains an encoded representation of the number of bytes in this structure.
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Value
Meaning
ONE_BYTE_VAL
0
Implies that the optional val2 field is not present. Hence, the structure is 1 byte in size.
TWO_BYTE_VAL
1
Implies that the optional val2 field is present. Hence, the structure is 2 bytes in size.
val1 (7 bits): A 7-bit, unsigned integer field containing the most significant 7 bits of the value represented by this structure.
val2 (1 byte): An 8-bit, unsigned integer containing the least significant bits of the value represented by this structure.