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| 1 | +/* | |
| 2 | + * Copyright (c) 1996, 1998, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.io; | |
| 27 | + | |
| 28 | +/** | |
| 29 | + * @author Limin Shi | |
| 30 | + * @author Mark Son-Bell | |
| 31 | + */ | |
| 32 | + | |
| 33 | +public class CharToByteSJIS extends CharToByteJIS0208 { | |
| 34 | + CharToByteJIS0201 cbJIS0201 = new CharToByteJIS0201(); | |
| 35 | + | |
| 36 | + public String getCharacterEncoding() { | |
| 37 | + return "SJIS"; | |
| 38 | + } | |
| 39 | + | |
| 40 | + protected int convSingleByte(char inputChar, byte[] outputByte) { | |
| 41 | + byte b; | |
| 42 | + | |
| 43 | + // \u0000 - \u007F map straight through | |
| 44 | + if ((inputChar & 0xFF80) == 0) { | |
| 45 | + outputByte[0] = (byte)inputChar; | |
| 46 | + return 1; | |
| 47 | + } | |
| 48 | + | |
| 49 | + if ((b = cbJIS0201.getNative(inputChar)) == 0) | |
| 50 | + return 0; | |
| 51 | + | |
| 52 | + outputByte[0] = b; | |
| 53 | + return 1; | |
| 54 | + } | |
| 55 | + | |
| 56 | + protected int getNative(char ch) { | |
| 57 | + int offset = index1[ch >> 8] << 8; | |
| 58 | + int pos = index2[offset >> 12].charAt((offset & 0xfff) + (ch & 0xff)); | |
| 59 | + if (pos == 0) { | |
| 60 | + /* Zero value indicates this Unicode has no mapping to JIS0208. | |
| 61 | + * We bail here because the JIS -> SJIS algorithm produces | |
| 62 | + * bogus SJIS values for invalid JIS input. Zero should be the | |
| 63 | + * only invalid JIS value in our table. | |
| 64 | + */ | |
| 65 | + return 0; | |
| 66 | + } | |
| 67 | + /* | |
| 68 | + * This algorithm for converting from JIS to SJIS comes from Ken Lunde's | |
| 69 | + * "Understanding Japanese Information Processing", pg 163. | |
| 70 | + */ | |
| 71 | + int c1 = (pos >> 8) & 0xff; | |
| 72 | + int c2 = pos & 0xff; | |
| 73 | + int rowOffset = c1 < 0x5F ? 0x70 : 0xB0; | |
| 74 | + int cellOffset = (c1 % 2 == 1) ? (c2 > 0x5F ? 0x20 : 0x1F) : 0x7E; | |
| 75 | + return ((((c1 + 1 ) >> 1) + rowOffset) << 8) | (c2 + cellOffset); | |
| 76 | + } | |
| 77 | +} | |