Character code conversion methods and systems

A conversion system converting characters from a source character set to a destination character set, comprising:

• a division module, dividing source character code of a character into a first part and a second part, wherein the source character code is character code of the character encoded in the source character set;
• a key table, comprising at least one recording range and each of the recording ranges has a starting address and an end address in the key table;
• an index table, comprising at least one entry and each entry records the starting address of the recording range as the head offset and the end address of the recording range as the tail offset;
• an encoding table, established by setting the destination character set in the positions corresponding to the key table based on the first parts and the second parts;
• an acquisition module, coupled to the division module and the index table, acquiring a head offset and a tail offset in the index table according to the first part;
• a search module, coupled to the division module, the key table, and the acquisition module, searching the second part in the key table based on the head offset and the tail offset;
• and
• a retrieve module, coupled to the encoding table and the search module, retrieving destination character code of the character from the encoding table matching to the searching result, wherein the destination character code is character code of the character encoded in the destination character set.