Class UnicodeDecompressor

java.lang.Object
org.graalvm.shadowed.com.ibm.icu.text.UnicodeDecompressor
public final class UnicodeDecompressor extends Object
A decompression engine implementing the Standard Compression Scheme for Unicode (SCSU) as outlined in Unicode Technical Report #6.

USAGE

The static methods on UnicodeDecompressor may be used in a straightforward manner to decompress simple strings:

 byte [] compressed = ... ; // get compressed bytes from somewhere
 String result = UnicodeDecompressor.decompress(compressed);

The static methods have a fairly large memory footprint. For finer-grained control over memory usage, UnicodeDecompressor offers more powerful APIs allowing iterative decompression:

 // Decompress an array "bytes" of length "len" using a buffer of 512 chars
 // to the Writer "out"

 UnicodeDecompressor myDecompressor         = new UnicodeDecompressor();
 final static int    BUFSIZE                = 512;
 char []             charBuffer             = new char [ BUFSIZE ];
 int                 charsWritten           = 0;
 int []              bytesRead              = new int [1];
 int                 totalBytesDecompressed = 0;
 int                 totalCharsWritten      = 0;

 do {
   // do the decompression
   charsWritten = myDecompressor.decompress(bytes, totalBytesDecompressed,
                                            len, bytesRead,
                                            charBuffer, 0, BUFSIZE);

   // do something with the current set of chars
   out.write(charBuffer, 0, charsWritten);

   // update the no. of bytes decompressed
   totalBytesDecompressed += bytesRead[0];

   // update the no. of chars written
   totalCharsWritten += charsWritten;

 } while(totalBytesDecompressed < len);

 myDecompressor.reset(); // reuse decompressor

Decompression is performed according to the standard set forth in Unicode Technical Report #6

See Also: