JCL Help:MaximumUTF16
JCL Help: MaximumUTF16 Constant
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Summary
Maximum value for an UTF-16 encoded character
Pascal
MaximumUTF16: UCS4 = $0010FFFF;
SurrogateHighStart = UCS4($D800);
SurrogateHighEnd = UCS4($DBFF);
SurrogateLowStart = UCS4($DC00);
SurrogateLowEnd = UCS4($DFFF);
Description
This constant denotes the maximum value for an UTF-16 character. Valid UTF-16 characters are included in range [#0..MaximumUTF16], with the exclusion of ranges [SurrogateLowStart..SurrogateLowEnd] and [SurrogateHighStart..SurrogateHighEnd].
In an UTF-16 stream, characters are read per 16-bit wide chunk. Characters are decoded as follow: A first 16-bit chunk is read, if its value is included in [SurrogateLowStart..SurrogateLowEnd], it is an error. If its value is not included in [SurrogateHighStart..SurrogateHighEnd], then the character value is equal to this first chunk. If the value of the first chunk is included in [SurrogateHighStart..SurrogateHighEnd], a second thunk is read and its value has to be included in [SurrogateLowStart..SurrogateLowEnd], it is an error otherwise. Finally the value of these two thunk are combined to make the character value.
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