Performing a code conversion in a smaller target encoding space

A computer program product, the computer program product comprising a non-transitory computer readable storage medium having computer readable program code embodied therewith, said computer readable program code being executable by a computer to:

• receive a main conversion file for a code conversion where a target encoding space associated with a target file is smaller than a source encoding space associated with a source file;
• generate an extension converted file from said source file according to a pre-established mapping table of code conversion stored in a memory, the pre-established mapping table established with language features that include at least one identical or similar language feature to a group of rare words that are provided in the source and target files;
• and
• complete said code conversion by using said main conversion file and said extension file together so that said source file does not need to be truncated in order to fit into said target conversion space,
• wherein a rare word is a character in said source encoding space but a corresponding code for said same rare word is not provided in said target encoding space.

A system for performing a code conversion having a computer host, comprising:

• a bus system;
• a memory connected with said bus system, wherein said memory includes a set of stored instructions;
• a processing unit connected to said bus system;
• said processing unit receiving a main conversion file for a code conversion where a target encoding space associated with a target file is smaller than a source encoding space associated with a source file;
• said processing unit generating an extension converted file from said source file according to a pre-established mapping table of code conversion stored in said memory and associated with said stored instruction, the pre-established mapping table established with language features that include at least one identical or similar language feature to a group of rare words that are provided in the source and target files;
• said processing unit completing said code conversion by using said main conversion file and said extension file together so that said source file does not need to be truncated in order to fit into said target conversion space;
• and
• wherein a rare word is a character in said source encoding space but a corresponding code for said same rare word is not provided in said target encoding space.