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Posted to commits@lucene.apache.org by yo...@apache.org on 2010/05/25 23:32:08 UTC
svn commit: r948215 -
/lucene/dev/trunk/solr/src/java/org/apache/solr/util/ByteUtils.java
Author: yonik
Date: Tue May 25 21:32:08 2010
New Revision: 948215
URL: http://svn.apache.org/viewvc?rev=948215&view=rev
Log:
SOLR-1900: add missing ByteUtils.java
Added:
lucene/dev/trunk/solr/src/java/org/apache/solr/util/ByteUtils.java (with props)
Added: lucene/dev/trunk/solr/src/java/org/apache/solr/util/ByteUtils.java
URL: http://svn.apache.org/viewvc/lucene/dev/trunk/solr/src/java/org/apache/solr/util/ByteUtils.java?rev=948215&view=auto
==============================================================================
--- lucene/dev/trunk/solr/src/java/org/apache/solr/util/ByteUtils.java (added)
+++ lucene/dev/trunk/solr/src/java/org/apache/solr/util/ByteUtils.java Tue May 25 21:32:08 2010
@@ -0,0 +1,76 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.solr.util;
+
+import org.apache.lucene.util.ArrayUtil;
+import org.apache.lucene.util.BytesRef;
+import org.apache.noggit.CharArr;
+
+
+public class ByteUtils {
+
+ /** Converts utf8 to utf16 and returns the number of 16 bit Java chars written.
+ * Full characters are read, even if this reads past the length passed (and can result in
+ * an exception if invalid UTF8 is passed).
+ * The char[] out should probably have enough room to hold the worst case of each byte becoming a Java char. */
+ public static int UTF8toUTF16(byte[] utf8, int offset, int len, char[] out, int out_offset) {
+ int out_start = out_offset;
+
+ while (offset < len) {
+ int b = utf8[offset++]&0xff;
+
+ if (b < 0xc0) {
+ assert b < 0x80;
+ out[out_offset++] = (char)b;
+ } else if (b < 0xe0) {
+ out[out_offset++] = (char)(((b&0x1f)<<6) + (utf8[offset++]&0x3f));
+ } else if (b < 0xf0) {
+ out[out_offset++] = (char)(((b&0xf)<<12) + ((utf8[offset]&0x3f)<<6) + (utf8[offset+1]&0x3f));
+ offset += 2;
+ } else {
+ assert b < 0xf8;
+ int ch = ((b&0x7)<<18) + ((utf8[offset]&0x3f)<<12) + ((utf8[offset+1]&0x3f)<<6) + (utf8[offset+2]&0x3f);
+ offset += 3;
+ if (ch < 0xffff) {
+ out[out_offset++] = (char)ch;
+ } else {
+ int chHalf = ch - 0x0010000;
+ out[out_offset++] = (char) ((chHalf >> 10) + 0xD800);
+ out[out_offset++] = (char) ((chHalf & 0x3FFL) + 0xDC00);
+ }
+ }
+ }
+
+ return out_offset - out_start;
+ }
+
+ /** Convert UTF8 bytes into UTF16 characters. */
+ public static void UTF8toUTF16(BytesRef utf8, CharArr out) {
+ // TODO: do in chunks if the input is large
+ out.reserve(utf8.length);
+ int n = UTF8toUTF16(utf8.bytes, utf8.offset, utf8.length, out.getArray(), out.getEnd());
+ out.setEnd(out.getEnd() + n);
+ }
+
+ /** Convert UTF8 bytes into a String */
+ public static String UTF8toUTF16(BytesRef utf8) {
+ char[] out = new char[utf8.length];
+ int n = UTF8toUTF16(utf8.bytes, utf8.offset, utf8.length, out, 0);
+ return new String(out,0,n);
+ }
+}
Propchange: lucene/dev/trunk/solr/src/java/org/apache/solr/util/ByteUtils.java
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svn:eol-style = native
Propchange: lucene/dev/trunk/solr/src/java/org/apache/solr/util/ByteUtils.java
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svn:executable = *
Propchange: lucene/dev/trunk/solr/src/java/org/apache/solr/util/ByteUtils.java
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svn:keywords = Date Author Id Revision HeadURL