chaokunyang commented on code in PR #1890: URL: https://github.com/apache/fury/pull/1890#discussion_r1807807425
########## java/fury-core/src/main/java/org/apache/fury/util/StringEncodingUtils.java: ########## @@ -0,0 +1,362 @@ +/* + * 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.fury.util; + +import static org.apache.fury.util.StringUtils.MULTI_CHARS_NON_LATIN_MASK; + +import org.apache.fury.memory.Platform; + +/** String Encoding Utils. */ +public class StringEncodingUtils { + + public static int convertUTF16ToUTF8(char[] src, byte[] dst, int dp) { + int numChars = src.length; + for (int charOffset = 0; charOffset < numChars; ) { + if (charOffset + 4 <= numChars + && (Platform.getLong(src, Platform.CHAR_ARRAY_OFFSET + charOffset * 2L) + & MULTI_CHARS_NON_LATIN_MASK) + == 0) { + // ascii only + dst[dp] = (byte) src[charOffset]; + dst[dp + 1] = (byte) src[charOffset + 1]; + dst[dp + 2] = (byte) src[charOffset + 2]; + dst[dp + 3] = (byte) src[charOffset + 3]; + dp += 4; + charOffset += 4; + } else { + char c = src[charOffset++]; + if (c < 0x80) { + dst[dp++] = (byte) c; + } else if (c < 0x800) { + dst[dp] = (byte) (0xc0 | (c >> 6)); + dst[dp + 1] = (byte) (0x80 | (c & 0x3f)); + dp += 2; + } else if (c >= '\uD800' && c <= Character.MAX_LOW_SURROGATE) { + char d; + if (c > Character.MAX_HIGH_SURROGATE + || charOffset == src.length + || (d = src[charOffset]) < Character.MIN_LOW_SURROGATE + || d > Character.MAX_LOW_SURROGATE) { + throw new RuntimeException("malformed input off : " + charOffset); + } + + int uc = ((c << 10) + d) + (0x010000 - ('\uD800' << 10) - Character.MIN_LOW_SURROGATE); + dst[dp] = (byte) (0xf0 | ((uc >> 18))); + dst[dp + 1] = (byte) (0x80 | ((uc >> 12) & 0x3f)); + dst[dp + 2] = (byte) (0x80 | ((uc >> 6) & 0x3f)); + dst[dp + 3] = (byte) (0x80 | (uc & 0x3f)); + dp += 4; + charOffset++; + } else { + dst[dp] = (byte) (0xe0 | ((c >> 12))); + dst[dp + 1] = (byte) (0x80 | ((c >> 6) & 0x3f)); + dst[dp + 2] = (byte) (0x80 | (c & 0x3f)); + dp += 3; + } + } + } + return dp; + } + Review Comment: ```suggestion /** * A fast decoding implementation to convert a utf8 encoded string into utf16 encoded * string when most chars in the string are ascii chars. */ ``` ########## java/fury-core/src/main/java/org/apache/fury/util/StringEncodingUtils.java: ########## @@ -0,0 +1,362 @@ +/* + * 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.fury.util; + +import static org.apache.fury.util.StringUtils.MULTI_CHARS_NON_LATIN_MASK; + +import org.apache.fury.memory.Platform; + +/** String Encoding Utils. */ +public class StringEncodingUtils { + + public static int convertUTF16ToUTF8(char[] src, byte[] dst, int dp) { + int numChars = src.length; + for (int charOffset = 0; charOffset < numChars; ) { + if (charOffset + 4 <= numChars + && (Platform.getLong(src, Platform.CHAR_ARRAY_OFFSET + charOffset * 2L) + & MULTI_CHARS_NON_LATIN_MASK) + == 0) { + // ascii only + dst[dp] = (byte) src[charOffset]; + dst[dp + 1] = (byte) src[charOffset + 1]; + dst[dp + 2] = (byte) src[charOffset + 2]; + dst[dp + 3] = (byte) src[charOffset + 3]; + dp += 4; + charOffset += 4; + } else { + char c = src[charOffset++]; + if (c < 0x80) { + dst[dp++] = (byte) c; + } else if (c < 0x800) { + dst[dp] = (byte) (0xc0 | (c >> 6)); + dst[dp + 1] = (byte) (0x80 | (c & 0x3f)); + dp += 2; + } else if (c >= '\uD800' && c <= Character.MAX_LOW_SURROGATE) { + char d; + if (c > Character.MAX_HIGH_SURROGATE + || charOffset == src.length + || (d = src[charOffset]) < Character.MIN_LOW_SURROGATE + || d > Character.MAX_LOW_SURROGATE) { + throw new RuntimeException("malformed input off : " + charOffset); + } + + int uc = ((c << 10) + d) + (0x010000 - ('\uD800' << 10) - Character.MIN_LOW_SURROGATE); + dst[dp] = (byte) (0xf0 | ((uc >> 18))); + dst[dp + 1] = (byte) (0x80 | ((uc >> 12) & 0x3f)); + dst[dp + 2] = (byte) (0x80 | ((uc >> 6) & 0x3f)); + dst[dp + 3] = (byte) (0x80 | (uc & 0x3f)); + dp += 4; + charOffset++; + } else { + dst[dp] = (byte) (0xe0 | ((c >> 12))); + dst[dp + 1] = (byte) (0x80 | ((c >> 6) & 0x3f)); + dst[dp + 2] = (byte) (0x80 | (c & 0x3f)); + dp += 3; + } + } + } + return dp; + } + Review Comment: ```suggestion /** * A fast decoding implementation to convert a utf8 encoded string into utf16 encoded * string when most chars in the string are ascii chars. */ ``` -- This is an automated message from the Apache Git Service. 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