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2.2.2.1.3 DBCSRANGE

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The DBCSRANGE tag marks the start of the mapping from double-byte bytes to Unicode UTF-16. It has one field.

Field 1: The number of records of lead byte ranges.

An example of the DBCSRANGE tag is:

 DBCSRANGE 2

The Lead Byte Range records follow the DBCSRANGE section. These mapping records have two fields.

Field 1: The start of lead byte range.

Field 2: The end of lead byte range.

The following example shows one of the Lead Byte Range records for codepage 932. In this codepage, it has one range of lead byte, starting from 0x81 (decimal 129) to 0x9f (decimal 159). So there are 31 lead bytes in this example (159 – 129 + 1). Each lead byte will have a corresponding DBCSRANGE.

 0x81 0x9f; Lead Byte Range
 

A group of DBCSTABLE sections follows the lead-byte range record. Each lead byte will have a corresponding DBCSTABLE section. In each DBCSTABLE section, it has one field.

Field 1: This field is the number of trail byte mappings for the lead byte.

The lead byte of the first DBCSTABLE is the first lead byte of the previous Lead Byte Range record. Each subsequent DBCSTABLE is for the next consecutive lead byte value.

The following example shows the first DBCSTABLE for codepage 932. This is for lead byte 0x81.

 DBCSTABLE 147; LeadByte = 0x81
 

The DBCSTABLE record describes the mappings available for a particular lead byte. The comment is ignored but descriptive.

Field 1: This field is the trail byte to map from.

Field 2: This field is the Unicode UTF-16 code point that this lead byte/trail byte combination map to.

The following example shows DBCSTABLE records for codepage 932 for lead byte 0x81.

 0x40 0x3000; Ideographic Space
 0x41 0x3001; Ideographic Comma
 ...