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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/nio/charset/UTF_16Encoder.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/nio/charset/UTF_16Encoder.java')
-rw-r--r-- | libjava/classpath/gnu/java/nio/charset/UTF_16Encoder.java | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/nio/charset/UTF_16Encoder.java b/libjava/classpath/gnu/java/nio/charset/UTF_16Encoder.java new file mode 100644 index 000000000..5283be491 --- /dev/null +++ b/libjava/classpath/gnu/java/nio/charset/UTF_16Encoder.java @@ -0,0 +1,145 @@ +/* UTF_16Encoder.java -- + Copyright (C) 2002 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + +package gnu.java.nio.charset; + +import java.nio.ByteBuffer; +import java.nio.ByteOrder; +import java.nio.CharBuffer; +import java.nio.charset.Charset; +import java.nio.charset.CharsetEncoder; +import java.nio.charset.CoderResult; + +/** + * Encoder for UTF-16, UTF-15LE, and UTF-16BE. + * + * @author Jesse Rosenstock + */ +final class UTF_16Encoder extends CharsetEncoder +{ + // byte orders + static final int BIG_ENDIAN = 0; + static final int LITTLE_ENDIAN = 1; + + private static final char BYTE_ORDER_MARK = 0xFEFF; + + private final ByteOrder byteOrder; + private final boolean useByteOrderMark; + private boolean needsByteOrderMark; + + UTF_16Encoder (Charset cs, int byteOrder, boolean useByteOrderMark) + { + super (cs, 2.0f, + useByteOrderMark ? 4.0f : 2.0f, + byteOrder == BIG_ENDIAN + ? new byte[] { (byte) 0xFF, (byte) 0xFD } + : new byte[] { (byte) 0xFD, (byte) 0xFF }); + this.byteOrder = (byteOrder == BIG_ENDIAN) ? + ByteOrder.BIG_ENDIAN : ByteOrder.LITTLE_ENDIAN; + this.useByteOrderMark = useByteOrderMark; + this.needsByteOrderMark = useByteOrderMark; + } + + protected CoderResult encodeLoop (CharBuffer in, ByteBuffer out) + { + // TODO: Optimize this in the case in.hasArray() / out.hasArray() + + ByteOrder originalBO = out.order(); + out.order(byteOrder); + + if (needsByteOrderMark) + { + if (out.remaining () < 2) + { + out.order(originalBO); + return CoderResult.OVERFLOW; + } + out.putChar (BYTE_ORDER_MARK); + needsByteOrderMark = false; + } + + int inPos = in.position (); + try + { + while (in.hasRemaining ()) + { + char c = in.get (); + if (0xD800 <= c && c <= 0xDFFF) + { + // c is a surrogate + + // make sure c is a high surrogate + if (c > 0xDBFF) + return CoderResult.malformedForLength (1); + if (in.remaining () < 1) + return CoderResult.UNDERFLOW; + char d = in.get (); + // make sure d is a low surrogate + if (d < 0xDC00 || d > 0xDFFF) + return CoderResult.malformedForLength (1); + out.putChar (c); + out.putChar (d); + inPos += 2; + } + else + { + if (out.remaining () < 2) + { + out.order(originalBO); + return CoderResult.OVERFLOW; + } + out.putChar (c); + inPos++; + } + } + out.order(originalBO); + return CoderResult.UNDERFLOW; + } + finally + { + in.position (inPos); + } + } + + protected void implReset () + { + needsByteOrderMark = useByteOrderMark; + } + + // TODO: override canEncode(char) and canEncode(CharSequence) + // for performance +} |