File	Doc	Category	Size	Date	Package
UTF7StyleCharsetDecoder.java	API Doc	Android 1.5 API	6651	Wed May 06 22:42:46 BST 2009	com.beetstra.jutf7

UTF7StyleCharsetDecoder

• java.lang.Object
  • java.nio.charset.CharsetDecoder

Fields Summary
private final Base64Util	base64
private final byte	shift
private final byte	unshift
private final boolean	strict
private boolean	base64mode
private int	bitsRead
private int	tempChar
private boolean	justShifted
private boolean	justUnshifted

Constructors Summary
UTF7StyleCharsetDecoder(UTF7StyleCharset cs, Base64Util base64, boolean strict) super(cs, 0.6f, 1.0f); this.base64 = base64; this.strict = strict; this.shift = cs.shift(); this.unshift = cs.unshift();

Methods Summary
private boolean	base64bitsWaiting() return True if there are base64 encoded characters waiting to be written return tempChar != 0 || bitsRead >= 6;
protected java.nio.charset.CoderResult	decodeLoop(java.nio.ByteBuffer in, java.nio.CharBuffer out) while (in.hasRemaining()) { byte b = in.get(); if (base64mode) { if (b == unshift) { if (base64bitsWaiting()) return malformed(in); if (justShifted) { if (!out.hasRemaining()) return overflow(in); out.put((char)shift); } else justUnshifted = true; setUnshifted(); } else { if (!out.hasRemaining()) return overflow(in); CoderResult result = handleBase64(in, out, b); if (result != null) return result; } justShifted = false; } else { if (b == shift) { base64mode = true; if (justUnshifted && strict) return malformed(in); justShifted = true; continue; } if (!out.hasRemaining()) return overflow(in); out.put((char)b); justUnshifted = false; } } return CoderResult.UNDERFLOW;
private java.nio.charset.CoderResult	handleBase64(java.nio.ByteBuffer in, java.nio.CharBuffer out, byte lastRead) Decodes a byte in base 64 mode. Will directly write a character to the output buffer if completed. param in The input buffer param out The output buffer param lastRead Last byte read from the input buffer return CoderResult.malformed if a non-base 64 character was encountered in strict mode, null otherwise CoderResult result = null; int sextet = base64.getSextet(lastRead); if (sextet >= 0) { bitsRead += 6; if (bitsRead < 16) { tempChar += sextet << (16 - bitsRead); } else { bitsRead -= 16; tempChar += sextet >> (bitsRead); out.put((char)tempChar); tempChar = (sextet << (16 - bitsRead)) & 0xFFFF; } } else { if (strict) return malformed(in); out.put((char)lastRead); if (base64bitsWaiting()) result = malformed(in); setUnshifted(); } return result;
protected java.nio.charset.CoderResult	implFlush(java.nio.CharBuffer out) if ((base64mode && strict) || base64bitsWaiting()) return CoderResult.malformedForLength(1); return CoderResult.UNDERFLOW;
protected void	implReset() setUnshifted(); justUnshifted = false;
private java.nio.charset.CoderResult	malformed(java.nio.ByteBuffer in) Resets the input buffer position to just before the last byte read, and returns a result indicating to skip the last byte. param in The input buffer return CoderResult.malformedForLength(1); in.position(in.position() - 1); return CoderResult.malformedForLength(1);
private java.nio.charset.CoderResult	overflow(java.nio.ByteBuffer in) in.position(in.position() - 1); return CoderResult.OVERFLOW;
private void	setUnshifted() Updates internal state to reflect the decoder is no longer in base 64 mode base64mode = false; bitsRead = 0; tempChar = 0;