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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/ByteEncodeLoopHelper.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/nio/charset/ByteEncodeLoopHelper.java')
-rw-r--r-- | libjava/classpath/gnu/java/nio/charset/ByteEncodeLoopHelper.java | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/nio/charset/ByteEncodeLoopHelper.java b/libjava/classpath/gnu/java/nio/charset/ByteEncodeLoopHelper.java new file mode 100644 index 000000000..60e6d9bb0 --- /dev/null +++ b/libjava/classpath/gnu/java/nio/charset/ByteEncodeLoopHelper.java @@ -0,0 +1,165 @@ +/* ByteCharset.java -- Abstract class for generic 1-byte encodings. + Copyright (C) 2005 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.CharBuffer; +import java.nio.charset.CoderResult; + +/** + * Helper class to deal with encoding loops that write a byte at a time + * + * @author Ian Rogers + */ +public abstract class ByteEncodeLoopHelper +{ + /** + * @return can the given character be encoded + */ + protected abstract boolean isMappable(char c); + + /** + * Map the given character to a byte, the given character is guaranteed to be + * mappable + */ + protected abstract byte mapToByte(char c); + + /** + * Encodes one or more characters into one or more bytes, mapping each + * character to only one byte + * + * @param in character buffer to read from + * @param out byte buffer to write to + * @return the result state of the encoder + */ + CoderResult encodeLoop(CharBuffer in, ByteBuffer out) + { + if (in.hasArray() && out.hasArray()) + { + return arrayEncodeLoop(in, out); + } else + { + return normalEncodeLoop(in, out); + } + } + + /** + * Encode loop using get and put operations + */ + private CoderResult normalEncodeLoop(CharBuffer in, ByteBuffer out) + { + int outRemaining = out.remaining(); + int inRemaining = in.remaining(); + while (inRemaining > 0 && outRemaining > 0) + { + char c = in.get(); + inRemaining--; + + if (!isMappable(c)) + { + in.position(in.position() - 1); + return CoderResult.unmappableForLength(1); + } + byte b = mapToByte(c); + out.put(b); + outRemaining--; + } + if (inRemaining > 0) + { + return CoderResult.OVERFLOW; + } else + { + return CoderResult.UNDERFLOW; + } + } + + /** + * Encode loop using array read and write operations + */ + private CoderResult arrayEncodeLoop(CharBuffer in, ByteBuffer out) + { + char[] inArray = in.array(); + byte[] outArray = out.array(); + int inPos = in.arrayOffset() + in.position(); + int outPos = out.arrayOffset() + out.position(); + int inRemaining = in.remaining(); + int outRemaining = out.remaining(); + CoderResult result; + + bailOut: + if (inRemaining <= outRemaining) + { + for (int i = 0; i < inRemaining; i++) + { + char inChar = inArray[inPos]; + inPos++; + if (!isMappable(inChar)) + { + inPos--; + result = CoderResult.unmappableForLength(1); + break bailOut; + } + byte b = mapToByte(inChar); + outArray[outPos] = b; + outPos++; + } + result = CoderResult.UNDERFLOW; + } + else + { + for (int i = 0; i < outRemaining; i++) + { + char inChar = inArray[inPos]; + inPos++; + if (!isMappable(inChar)) + { + inPos--; + result = CoderResult.unmappableForLength(1); + break bailOut; + } + byte b = mapToByte(inChar); + outArray[outPos] = b; + outPos++; + } + result = CoderResult.OVERFLOW; + } + in.position(inPos - in.arrayOffset()); + out.position(outPos - out.arrayOffset()); + return result; + } +} |