CID (character identifier) is a character identifier, which is divided into two parts: CIDFont and CMap table. CIDFont file is a total character set, which includes all commonly used characters in a specific language. If these characters are sorted, their secondary serial numbers in the total character set are CID identification codes (indexes); ) every character. CMap (Character Mapping) table is a character mapping file, which maps the code of a character to the CID identification code (index) of a character. CID font is designed for large character set market, and its basic process is: first, according to the code, find the index in CMap table, and then find the corresponding font data in CID font file.
Criminal investigation department.
Responsible for investigating serious crimes and cross-regional crimes; It is also responsible for collecting, collating and evaluating information about criminals and criminal activities in this area.