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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 | } | ||