If present, the long variable names record has the following format:
/* Header. */ int32 rec_type; int32 subtype; int32 size; int32 count; /* Exactly
countbytes of data. */ char var_name_pairs;
Record type. Always set to 7.
Record subtype. Always set to 13.
The size of each element in the
var_name_pairs member. Always set to 1.
The total number of bytes in
A list of key–value tuples, where key is the name
of a variable, and value is its long variable name.
The key field is at most 8 bytes long and must match the
name of a variable which appears in the variable record (see Variable Record).
The value field is at most 64 bytes long.
The key and value fields are separated by a ‘=’ byte.
Each tuple is separated by a byte whose value is 09. There is no
trailing separator following the last tuple.
The total length is