native2ascii.exe is included with the JDK (Java Development Kit) in J:\Program Files\java\jdk1.8.0_121\ \bin. It converts files from any encoding to 8-bit printable form and back. 8-bit printable using ASCII characters plus forms like \u95e8 for the exotic characters.
Here is how you would take a file in the old DOS (Disk Operating System) IBMOEM encoding and bring it up to UTF-8 snuff for posting on the
REM convert IBM OEM fil to ASCII with \escapes native2ascii -encoding Cp437 ibm.txt intermediate.txt REM convert intermediate ASCII with \escapes to windows-1252 native2ascii -encoding windows-1252 -reverse intermediate.txt web.txtHere is how you would take an UTF-8 file and convert it back to a native format, e.g. in this case windows-1252 for W2K.
REM convert UTF-8 to ascii with \escapes native2ascii -encoding UTF-8 utf.txt intermediate.txt REM convert intermediate ASCII with \escapes to CP1252 native2ascii -encoding Cp1252 -reverse intermediate.txt nt.txt
You can export part of the registry in your chosen encoding.
REM export part of the registry regedit /E java.reg "HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft" REM convert unicode to readable ASCII with escapes. native2ascii -encoding UnicodeLittle java.reg java.ascYou can convert between any two encodings, by going in two steps, via printable. Someone should probably write an improved version of this little utility that can convert from anything to anything in one step and that can will put the input back on top of the input file by default. You do this by creating a temporary output file in the same directory as the input file, then renaming when safely done.
You can also use native2ascii to compose arbitrary binary files. Compose using \uxxxx sequences and then convert them to binary.
If you have BOMs (Byte Order Marks) use x-UTF-16LE-BOM, X-UTF-32BE-BOM and X-UTF-32LE-BOM which have a definite BOM (Byte Order Mark). The encodings where it is optional seem to flummox native2ascii.
See this list of possible encodings.
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