2 *******************************************************************************
3 * Copyright (C) 2008-2010, International Business Machines Corporation and *
4 * others. All Rights Reserved. *
5 *******************************************************************************
7 package com.ibm.icu.charset;
9 import java.nio.ByteBuffer;
10 import java.nio.CharBuffer;
11 import java.nio.IntBuffer;
12 import java.nio.charset.CharsetDecoder;
13 import java.nio.charset.CharsetEncoder;
14 import java.nio.charset.CoderResult;
16 import com.ibm.icu.charset.CharsetMBCS.CharsetDecoderMBCS;
17 import com.ibm.icu.charset.CharsetMBCS.CharsetEncoderMBCS;
18 import com.ibm.icu.text.UnicodeSet;
19 import com.ibm.icu.util.ULocale;
28 * (Lotus Multi-Byte Character Set)
30 * LMBS was invented in the alte 1980's and is primarily used in Lotus Notes
31 * databases and in Lotus 1-2-3 files. Programmers who work with the APIs
32 * into these products will sometimes need to deal with strings in this format.
34 * The code in this file provides an implementation for an ICU converter of
35 * LMBCS to and from Unicode.
37 * Since the LMBCS character set is only sparsely documented in existing
38 * printed or online material, we have added extensive annotation to this
39 * file to serve as a guide to understanding LMBCS.
41 * LMBCS was originally designed with these four sometimes-competing design goals:
42 * -Provide encodings for characters in 12 existing national standards
43 * (plus a few other characters)
44 * -Minimal memory footprint
45 * -Maximal speed of conversion into the existing national character sets
46 * -No need to track a changing state as you interpret a string.
48 * All of the national character sets LMBCS was trying to encode are 'ANSI'
49 * based, in that the bytes from 0x20 - 0x7F are almost exactly the
50 * same common Latin unaccented characters and symbols in all character sets.
52 * So, in order to help meet the speed & memory design goals, the common ANSI
53 * bytes from 0x20-0x7F are represented by the same single-byte values in LMBCS.
55 class CharsetLMBCS extends CharsetICU {
57 * The general LMBCS code unit is from 1-3 bytes. We can describe the 3 bytes as
60 * That is, a sometimes-optional 'group' byte, followed by 1 and sometimes 2
61 * data bytes. The maximum size of a LMBCS character is 3 bytes:
63 private static final short ULMBCS_CHARSIZE_MAX = 3;
65 * The single-byte values from 0x20 to 0x7F are examples of single D1 bytes.
66 * We often have to figure out if byte values are below or above this, so we
67 * use the ANSI nomenclature 'C0' and 'C1' to refer to the range of control
68 * characters just above & below the common lower-ANSI range.
70 private static final short ULMBCS_C0END = 0x1F;
71 private static final short ULMBCS_C1START = 0x80;
73 * Most of the values less than 0x20 are reserved in LMBCS to announce
74 * which national character standard is being used for the 'D' bytes.
75 * In the comments we show that common name and the IBM character-set ID
76 * for these character-set announcers:
78 private static final short ULMBCS_GRP_L1 = 0x01; /* Latin-1 :ibm-850 */
79 private static final short ULMBCS_GRP_GR = 0x02; /* Greek :ibm-851 */
80 private static final short ULMBCS_GRP_HE = 0x03; /* Hebrew :ibm-1255 */
81 private static final short ULMBCS_GRP_AR = 0x04; /* Arabic :ibm-1256 */
82 private static final short ULMBCS_GRP_RU = 0x05; /* Cyrillic :ibm-1251 */
83 private static final short ULMBCS_GRP_L2 = 0x06; /* Latin-2 :ibm-852 */
84 private static final short ULMBCS_GRP_TR = 0x08; /* Turkish :ibm-1254 */
85 private static final short ULMBCS_GRP_TH = 0x0B; /* Thai :ibm-874 */
86 private static final short ULMBCS_GRP_JA = 0x10; /* Japanese :ibm-943 */
87 private static final short ULMBCS_GRP_KO = 0x11; /* Korean :ibm-1261 */
88 private static final short ULMBCS_GRP_TW = 0x12; /* Chinese SC :ibm-950 */
89 private static final short ULMBCS_GRP_CN = 0x13; /* Chinese TC :ibm-1386 */
91 * So, the beginnning of understanding LMBCS is that IF the first byte of a LMBCS
92 * character is one of those 12 values, you can interpret the remaining bytes of
93 * that character as coming from one of those character sets. Since the lower
94 * ANSI bytes already are represented in singl bytes, using one of the chracter
95 * set announcers is used to announce a character that starts with a byte of
98 * The character sets are arranged so that the single byte sets all appear
99 * before the multi-byte character sets. When we need to tell whether a
100 * group byte is for a single byte char set or not we use this definition:
102 private static final short ULMBCS_DOUBLEOPTGROUP_START = 0x10;
104 * However, to fully understand LMBCS, you must also understand a series of
105 * exceptions & optimizations made in service of the design goals.
107 * First, those of you who are character set mavens may have noticed that
108 * the 'double-byte' character sets are actually multi-byte chracter sets
109 * that can have 1 or two bytes, even in upper-ascii range. To force
110 * each group byte to introduce a fixed-width encoding (to make it faster to
111 * count characters), we use a convention of doubling up on the group byte
112 * to introduce any single-byte character > 0x80 in an otherwise double-byte
113 * character set. So, for example, the LMBCS sequence x10 x10 xAE is the
114 * same as '0xAE' in the Japanese code page 943.
116 * Next, you will notice that the list of group bytes has some gaps.
117 * These are used in various ways.
119 * We reserve a few special single byte values for common control
120 * characters. These are in the same place as their ANSI equivalents for speed.
122 private static final short ULMBCS_HT = 0x09; /* Fixed control-char - Horizontal Tab */
123 private static final short ULMBCS_LF = 0x0A; /* Fixed control-char - Line Feed */
124 private static final short ULMBCS_CR = 0x0D; /* Fixed control-char - Carriage Return */
126 * Then, 1-2-3 reserved a special single-byte character to put at the
127 * beginning of internal 'system' range names:
129 private static final short ULMBCS_123SYSTEMRANGE = 0x19;
131 * Then we needed a place to put all the other ansi control characters
132 * that must be moved to different values because LMBCS reserves those
133 * values for other purposes. To represent the control characters, we start
134 * with a first byte of 0x0F & add the control character value as the
137 private static final short ULMBCS_GRP_CTRL = 0x0F;
139 * For the C0 controls (less than 0x20), we add 0x20 to preserve the
140 * useful doctrine that any byte less than 0x20 in a LMBCS char must be
141 * the first byte of a character:
143 private static final short ULMBCS_CTRLOFFSET = 0x20;
145 * Where to put the characters that aren't part of any of the 12 national
146 * character sets? The first thing that was done, in the earlier years of
147 * LMBCS, was to use up the spaces of the form
149 * where 'G' was one of the single-byte character groups, and
150 * D1 was less than 0x80. These sequences are gathered together
151 * into a Lotus-invented doublebyte character set to represent a
152 * lot of stray values. Internally, in this implementation, we track this
153 * as group '0', as a place to tuck this exceptions list.
155 private static final short ULMBCS_GRP_EXCEPT = 0x00;
157 * Finally, as the durability and usefulness of UNICODE became clear,
158 * LOTUS added a new group 0x14 to hold Unicode values not otherwise
159 * represented in LMBCS:
161 private static final short ULMBCS_GRP_UNICODE = 0x14;
163 * The two bytes appearing after a 0x14 are interpreted as UTF-16 BE
164 * (Big Endian) characters. The exception comes when UTF16
165 * representation would have a zero as the second byte. In that case,
166 * 'F6' is used in its place, and the bytes are swapped. (This prevents
167 * LMBCS from encoding any Unicode values of the form U+F6xx, but that's OK:
168 * 0xF6xx is in the middle of the Private Use Area.)
170 private static char ULMBCS_UNICOMPATZERO = 0x00F6;
172 * It is also useful in our code to have a constant for the size of
173 * a LMBCS char that holds a literal Unicode value.
175 private static final short ULMBCS_UNICODE_SIZE = 3;
177 * To squish the LMBCS representation down even further, and to make
178 * translations even faster, sometimes the optimization group byte can be dropped
179 * from a LMBCS character. This is decided on a process-by-process basis. The
180 * group byte that is dropped is called the 'optimization group.'
182 * For Notes, the optimization group is always 0x1.
184 //private static final short ULMBCS_DEFAULTOPTGROUP = 0x01;
185 /* For 1-2-3 files, the optimization group is stored in the header of the 1-2-3
187 * In any case, when using ICU, you either pass in the
188 * optimization group as part of the name of the converter (LMBCS-1, LMBCS-2,
189 * etc.). Using plain 'LMBCS' as the name of the converter will give you
193 /* Implementation strategy */
195 * Because of the extensive use of other character sets, the LMBCS converter
196 * keeps a mapping between optimization groups and IBM character sets, so that
197 * ICU converters can be created and used as needed.
199 * As you can see, even though any byte below 0x20 could be an optimization
200 * byte, only those at 0x13 or below can map to an actual converter. To limit
201 * some loops and searches, we define a value for that last group converter:
203 private static final short ULMBCS_GRP_LAST = 0x13; /* last LMBCS group that has a converter */
205 private static final String[] OptGroupByteToCPName = {
206 /* 0x0000 */ "lmb-excp", /* internal home for the LOTUS exceptions list */
207 /* 0x0001 */ "ibm-850",
208 /* 0x0002 */ "ibm-851",
209 /* 0x0003 */ "windows-1255",
210 /* 0x0004 */ "windows-1256",
211 /* 0x0005 */ "windows-1251",
212 /* 0x0006 */ "ibm-852",
213 /* 0x0007 */ null, /* Unused */
214 /* 0x0008 */ "windows-1254",
215 /* 0x0009 */ null, /* Control char HT */
216 /* 0x000A */ null, /* Control char LF */
217 /* 0x000B */ "windows-874",
218 /* 0x000C */ null, /* Unused */
219 /* 0x000D */ null, /* Control char CR */
220 /* 0x000E */ null, /* Unused */
221 /* 0x000F */ null, /* Control chars: 0x0F20 + C0/C1 character: algorithmic */
222 /* 0x0010 */ "windows-932",
223 /* 0x0011 */ "windows-949",
224 /* 0x0012 */ "windows-950",
225 /* 0x0013 */ "windows-936",
226 /* The rest are null, including the 0x0014 Unicode compatibility region
227 * and 0x0019, the 1-2-3 system range control char */
231 /* That's approximately all the data that's needed for translating
234 * However, to translate Unicode to LMBCS, we need some more support.
236 * That's because there are often more than one possible mappings from a Unicode
237 * code point back into LMBCS. The first thing we do is look up into a table
238 * to figure out if there are more than one possible mapplings. This table,
239 * arranged by Unicode values (including ranges) either lists which group
240 * to use, or says that it could go into one or more of the SBCS sets, or
241 * into one or more of the DBCS sets. (If the character exists in both DBCS &
242 * SBCS, the table will place it in the SBCS sets, to make the LMBCS code point
243 * length as small as possible. Here's the two special markers we use to indicate
244 * ambiguous mappings:
246 private static final short ULMBCS_AMBIGUOUS_SBCS = 0x80; /* could fit in more than one
247 LMBCS sbcs native encoding
248 (example: most accented latin) */
249 private static final short ULMBCS_AMBIGUOUS_MBCS = 0x81; /* could fit in more than one
250 LMBCS mbcs native encoding
252 private static final short ULMBCS_AMBIGUOUS_ALL = 0x82;
254 /* And here's a simple way to see if a group falls in an appropriate range */
255 private boolean ULMBCS_AMBIGUOUS_MATCH(short agroup, short xgroup) {
256 return (((agroup == ULMBCS_AMBIGUOUS_SBCS) &&
257 (xgroup < ULMBCS_DOUBLEOPTGROUP_START)) ||
258 ((agroup == ULMBCS_AMBIGUOUS_MBCS) &&
259 (xgroup >= ULMBCS_DOUBLEOPTGROUP_START)) ||
260 ((agroup) == ULMBCS_AMBIGUOUS_ALL));
263 /* The table & some code to use it: */
264 private static class _UniLMBCSGrpMap {
268 _UniLMBCSGrpMap(int uniStartRange, int uniEndRange, short GrpType) {
269 this.uniStartRange = uniStartRange;
270 this.uniEndRange = uniEndRange;
271 this.GrpType = GrpType;
275 private static final _UniLMBCSGrpMap[] UniLMBCSGrpMap = {
276 new _UniLMBCSGrpMap(0x0001, 0x001F, ULMBCS_GRP_CTRL),
277 new _UniLMBCSGrpMap(0x0080, 0x009F, ULMBCS_GRP_CTRL),
278 new _UniLMBCSGrpMap(0x00A0, 0x00A6, ULMBCS_AMBIGUOUS_SBCS),
279 new _UniLMBCSGrpMap(0x00A7, 0x00A8, ULMBCS_AMBIGUOUS_ALL),
280 new _UniLMBCSGrpMap(0x00A9, 0x00AF, ULMBCS_AMBIGUOUS_SBCS),
281 new _UniLMBCSGrpMap(0x00B0, 0x00B1, ULMBCS_AMBIGUOUS_ALL),
282 new _UniLMBCSGrpMap(0x00B2, 0x00B3, ULMBCS_AMBIGUOUS_SBCS),
283 new _UniLMBCSGrpMap(0x00B4, 0x00B4, ULMBCS_AMBIGUOUS_ALL),
284 new _UniLMBCSGrpMap(0x00B5, 0x00B5, ULMBCS_AMBIGUOUS_SBCS),
285 new _UniLMBCSGrpMap(0x00B6, 0x00B6, ULMBCS_AMBIGUOUS_ALL),
286 new _UniLMBCSGrpMap(0x00B7, 0x00D6, ULMBCS_AMBIGUOUS_SBCS),
287 new _UniLMBCSGrpMap(0x00D7, 0x00D7, ULMBCS_AMBIGUOUS_ALL),
288 new _UniLMBCSGrpMap(0x00D8, 0x00F6, ULMBCS_AMBIGUOUS_SBCS),
289 new _UniLMBCSGrpMap(0x00F7, 0x00F7, ULMBCS_AMBIGUOUS_ALL),
290 new _UniLMBCSGrpMap(0x00F8, 0x01CD, ULMBCS_AMBIGUOUS_SBCS),
291 new _UniLMBCSGrpMap(0x01CE, 0x01CE, ULMBCS_GRP_TW ),
292 new _UniLMBCSGrpMap(0x01CF, 0x02B9, ULMBCS_AMBIGUOUS_SBCS),
293 new _UniLMBCSGrpMap(0x02BA, 0x02BA, ULMBCS_GRP_CN),
294 new _UniLMBCSGrpMap(0x02BC, 0x02C8, ULMBCS_AMBIGUOUS_SBCS),
295 new _UniLMBCSGrpMap(0x02C9, 0x02D0, ULMBCS_AMBIGUOUS_MBCS),
296 new _UniLMBCSGrpMap(0x02D8, 0x02DD, ULMBCS_AMBIGUOUS_SBCS),
297 new _UniLMBCSGrpMap(0x0384, 0x0390, ULMBCS_AMBIGUOUS_SBCS),
298 new _UniLMBCSGrpMap(0x0391, 0x03A9, ULMBCS_AMBIGUOUS_ALL),
299 new _UniLMBCSGrpMap(0x03AA, 0x03B0, ULMBCS_AMBIGUOUS_SBCS),
300 new _UniLMBCSGrpMap(0x03B1, 0x03C9, ULMBCS_AMBIGUOUS_ALL),
301 new _UniLMBCSGrpMap(0x03CA, 0x03CE, ULMBCS_AMBIGUOUS_SBCS),
302 new _UniLMBCSGrpMap(0x0400, 0x0400, ULMBCS_GRP_RU),
303 new _UniLMBCSGrpMap(0x0401, 0x0401, ULMBCS_AMBIGUOUS_ALL),
304 new _UniLMBCSGrpMap(0x0402, 0x040F, ULMBCS_GRP_RU),
305 new _UniLMBCSGrpMap(0x0410, 0x0431, ULMBCS_AMBIGUOUS_ALL),
306 new _UniLMBCSGrpMap(0x0432, 0x044E, ULMBCS_GRP_RU),
307 new _UniLMBCSGrpMap(0x044F, 0x044F, ULMBCS_AMBIGUOUS_ALL),
308 new _UniLMBCSGrpMap(0x0450, 0x0491, ULMBCS_GRP_RU),
309 new _UniLMBCSGrpMap(0x05B0, 0x05F2, ULMBCS_GRP_HE),
310 new _UniLMBCSGrpMap(0x060C, 0x06AF, ULMBCS_GRP_AR),
311 new _UniLMBCSGrpMap(0x0E01, 0x0E5B, ULMBCS_GRP_TH),
312 new _UniLMBCSGrpMap(0x200C, 0x200F, ULMBCS_AMBIGUOUS_SBCS),
313 new _UniLMBCSGrpMap(0x2010, 0x2010, ULMBCS_AMBIGUOUS_MBCS),
314 new _UniLMBCSGrpMap(0x2013, 0x2014, ULMBCS_AMBIGUOUS_SBCS),
315 new _UniLMBCSGrpMap(0x2015, 0x2015, ULMBCS_AMBIGUOUS_MBCS),
316 new _UniLMBCSGrpMap(0x2016, 0x2016, ULMBCS_AMBIGUOUS_MBCS),
317 new _UniLMBCSGrpMap(0x2017, 0x2017, ULMBCS_AMBIGUOUS_SBCS),
318 new _UniLMBCSGrpMap(0x2018, 0x2019, ULMBCS_AMBIGUOUS_ALL),
319 new _UniLMBCSGrpMap(0x201A, 0x201B, ULMBCS_AMBIGUOUS_SBCS),
320 new _UniLMBCSGrpMap(0x201C, 0x201D, ULMBCS_AMBIGUOUS_ALL),
321 new _UniLMBCSGrpMap(0x201E, 0x201F, ULMBCS_AMBIGUOUS_SBCS),
322 new _UniLMBCSGrpMap(0x2020, 0x2021, ULMBCS_AMBIGUOUS_ALL),
323 new _UniLMBCSGrpMap(0x2022, 0x2024, ULMBCS_AMBIGUOUS_SBCS),
324 new _UniLMBCSGrpMap(0x2025, 0x2025, ULMBCS_AMBIGUOUS_MBCS),
325 new _UniLMBCSGrpMap(0x2026, 0x2026, ULMBCS_AMBIGUOUS_ALL),
326 new _UniLMBCSGrpMap(0x2027, 0x2027, ULMBCS_GRP_TW),
327 new _UniLMBCSGrpMap(0x2030, 0x2030, ULMBCS_AMBIGUOUS_ALL),
328 new _UniLMBCSGrpMap(0x2031, 0x2031, ULMBCS_AMBIGUOUS_SBCS),
329 new _UniLMBCSGrpMap(0x2032, 0x2033, ULMBCS_AMBIGUOUS_MBCS),
330 new _UniLMBCSGrpMap(0x2035, 0x2035, ULMBCS_AMBIGUOUS_MBCS),
331 new _UniLMBCSGrpMap(0x2039, 0x203A, ULMBCS_AMBIGUOUS_SBCS),
332 new _UniLMBCSGrpMap(0x203B, 0x203B, ULMBCS_AMBIGUOUS_MBCS),
333 new _UniLMBCSGrpMap(0x203C, 0x203C, ULMBCS_GRP_EXCEPT),
334 new _UniLMBCSGrpMap(0x2074, 0x2074, ULMBCS_GRP_KO),
335 new _UniLMBCSGrpMap(0x207F, 0x207F, ULMBCS_GRP_EXCEPT),
336 new _UniLMBCSGrpMap(0x2081, 0x2084, ULMBCS_GRP_KO),
337 new _UniLMBCSGrpMap(0x20A4, 0x20AC, ULMBCS_AMBIGUOUS_SBCS),
338 new _UniLMBCSGrpMap(0x2103, 0x2109, ULMBCS_AMBIGUOUS_MBCS),
339 new _UniLMBCSGrpMap(0x2111, 0x2120, ULMBCS_AMBIGUOUS_SBCS),
340 /*zhujin: upgrade, for regressiont test, spr HKIA4YHTSU*/
341 new _UniLMBCSGrpMap(0x2121, 0x2121, ULMBCS_AMBIGUOUS_MBCS),
342 new _UniLMBCSGrpMap(0x2122, 0x2126, ULMBCS_AMBIGUOUS_SBCS),
343 new _UniLMBCSGrpMap(0x212B, 0x212B, ULMBCS_AMBIGUOUS_MBCS),
344 new _UniLMBCSGrpMap(0x2135, 0x2135, ULMBCS_AMBIGUOUS_SBCS),
345 new _UniLMBCSGrpMap(0x2153, 0x2154, ULMBCS_GRP_KO),
346 new _UniLMBCSGrpMap(0x215B, 0x215E, ULMBCS_GRP_EXCEPT),
347 new _UniLMBCSGrpMap(0x2160, 0x2179, ULMBCS_AMBIGUOUS_MBCS),
348 new _UniLMBCSGrpMap(0x2190, 0x2193, ULMBCS_AMBIGUOUS_ALL),
349 new _UniLMBCSGrpMap(0x2194, 0x2195, ULMBCS_GRP_EXCEPT),
350 new _UniLMBCSGrpMap(0x2196, 0x2199, ULMBCS_AMBIGUOUS_MBCS),
351 new _UniLMBCSGrpMap(0x21A8, 0x21A8, ULMBCS_GRP_EXCEPT),
352 new _UniLMBCSGrpMap(0x21B8, 0x21B9, ULMBCS_GRP_CN),
353 new _UniLMBCSGrpMap(0x21D0, 0x21D1, ULMBCS_GRP_EXCEPT),
354 new _UniLMBCSGrpMap(0x21D2, 0x21D2, ULMBCS_AMBIGUOUS_MBCS),
355 new _UniLMBCSGrpMap(0x21D3, 0x21D3, ULMBCS_GRP_EXCEPT),
356 new _UniLMBCSGrpMap(0x21D4, 0x21D4, ULMBCS_AMBIGUOUS_MBCS),
357 new _UniLMBCSGrpMap(0x21D5, 0x21D5, ULMBCS_GRP_EXCEPT),
358 new _UniLMBCSGrpMap(0x21E7, 0x21E7, ULMBCS_GRP_CN),
359 new _UniLMBCSGrpMap(0x2200, 0x2200, ULMBCS_AMBIGUOUS_MBCS),
360 new _UniLMBCSGrpMap(0x2201, 0x2201, ULMBCS_GRP_EXCEPT),
361 new _UniLMBCSGrpMap(0x2202, 0x2202, ULMBCS_AMBIGUOUS_MBCS),
362 new _UniLMBCSGrpMap(0x2203, 0x2203, ULMBCS_AMBIGUOUS_MBCS),
363 new _UniLMBCSGrpMap(0x2204, 0x2206, ULMBCS_GRP_EXCEPT),
364 new _UniLMBCSGrpMap(0x2207, 0x2208, ULMBCS_AMBIGUOUS_MBCS),
365 new _UniLMBCSGrpMap(0x2209, 0x220A, ULMBCS_GRP_EXCEPT),
366 new _UniLMBCSGrpMap(0x220B, 0x220B, ULMBCS_AMBIGUOUS_MBCS),
367 new _UniLMBCSGrpMap(0x220F, 0x2215, ULMBCS_AMBIGUOUS_MBCS),
368 new _UniLMBCSGrpMap(0x2219, 0x2219, ULMBCS_GRP_EXCEPT),
369 new _UniLMBCSGrpMap(0x221A, 0x221A, ULMBCS_AMBIGUOUS_MBCS),
370 new _UniLMBCSGrpMap(0x221B, 0x221C, ULMBCS_GRP_EXCEPT),
371 new _UniLMBCSGrpMap(0x221D, 0x221E, ULMBCS_AMBIGUOUS_MBCS),
372 new _UniLMBCSGrpMap(0x221F, 0x221F, ULMBCS_GRP_EXCEPT),
373 new _UniLMBCSGrpMap(0x2220, 0x2220, ULMBCS_AMBIGUOUS_MBCS),
374 new _UniLMBCSGrpMap(0x2223, 0x222A, ULMBCS_AMBIGUOUS_MBCS),
375 new _UniLMBCSGrpMap(0x222B, 0x223D, ULMBCS_AMBIGUOUS_MBCS),
376 new _UniLMBCSGrpMap(0x2245, 0x2248, ULMBCS_GRP_EXCEPT),
377 new _UniLMBCSGrpMap(0x224C, 0x224C, ULMBCS_GRP_TW),
378 new _UniLMBCSGrpMap(0x2252, 0x2252, ULMBCS_AMBIGUOUS_MBCS),
379 new _UniLMBCSGrpMap(0x2260, 0x2261, ULMBCS_AMBIGUOUS_MBCS),
380 new _UniLMBCSGrpMap(0x2262, 0x2265, ULMBCS_GRP_EXCEPT),
381 new _UniLMBCSGrpMap(0x2266, 0x226F, ULMBCS_AMBIGUOUS_MBCS),
382 new _UniLMBCSGrpMap(0x2282, 0x2283, ULMBCS_AMBIGUOUS_MBCS),
383 new _UniLMBCSGrpMap(0x2284, 0x2285, ULMBCS_GRP_EXCEPT),
384 new _UniLMBCSGrpMap(0x2286, 0x2287, ULMBCS_AMBIGUOUS_MBCS),
385 new _UniLMBCSGrpMap(0x2288, 0x2297, ULMBCS_GRP_EXCEPT),
386 new _UniLMBCSGrpMap(0x2299, 0x22BF, ULMBCS_AMBIGUOUS_MBCS),
387 new _UniLMBCSGrpMap(0x22C0, 0x22C0, ULMBCS_GRP_EXCEPT),
388 new _UniLMBCSGrpMap(0x2310, 0x2310, ULMBCS_GRP_EXCEPT),
389 new _UniLMBCSGrpMap(0x2312, 0x2312, ULMBCS_AMBIGUOUS_MBCS),
390 new _UniLMBCSGrpMap(0x2318, 0x2321, ULMBCS_GRP_EXCEPT),
391 new _UniLMBCSGrpMap(0x2318, 0x2321, ULMBCS_GRP_CN),
392 new _UniLMBCSGrpMap(0x2460, 0x24E9, ULMBCS_AMBIGUOUS_MBCS),
393 new _UniLMBCSGrpMap(0x2500, 0x2500, ULMBCS_AMBIGUOUS_SBCS),
394 new _UniLMBCSGrpMap(0x2501, 0x2501, ULMBCS_AMBIGUOUS_MBCS),
395 new _UniLMBCSGrpMap(0x2502, 0x2502, ULMBCS_AMBIGUOUS_ALL),
396 new _UniLMBCSGrpMap(0x2503, 0x2503, ULMBCS_AMBIGUOUS_MBCS),
397 new _UniLMBCSGrpMap(0x2504, 0x2505, ULMBCS_GRP_TW),
398 new _UniLMBCSGrpMap(0x2506, 0x2665, ULMBCS_AMBIGUOUS_ALL),
399 new _UniLMBCSGrpMap(0x2666, 0x2666, ULMBCS_GRP_EXCEPT),
400 new _UniLMBCSGrpMap(0x2667, 0x2669, ULMBCS_AMBIGUOUS_SBCS),
401 new _UniLMBCSGrpMap(0x266A, 0x266A, ULMBCS_AMBIGUOUS_ALL),
402 new _UniLMBCSGrpMap(0x266B, 0x266C, ULMBCS_AMBIGUOUS_SBCS),
403 new _UniLMBCSGrpMap(0x266D, 0x266D, ULMBCS_AMBIGUOUS_MBCS),
404 new _UniLMBCSGrpMap(0x266E, 0x266E, ULMBCS_AMBIGUOUS_SBCS),
405 new _UniLMBCSGrpMap(0x266F, 0x266F, ULMBCS_GRP_JA),
406 new _UniLMBCSGrpMap(0x2670, 0x2E7F, ULMBCS_AMBIGUOUS_SBCS),
407 new _UniLMBCSGrpMap(0x2E80, 0xF861, ULMBCS_AMBIGUOUS_MBCS),
408 new _UniLMBCSGrpMap(0xF862, 0xF8FF, ULMBCS_GRP_EXCEPT),
409 new _UniLMBCSGrpMap(0xF900, 0xFA2D, ULMBCS_AMBIGUOUS_MBCS),
410 new _UniLMBCSGrpMap(0xFB00, 0xFEFF, ULMBCS_AMBIGUOUS_SBCS),
411 new _UniLMBCSGrpMap(0xFF01, 0xFFEE, ULMBCS_AMBIGUOUS_MBCS),
412 new _UniLMBCSGrpMap(0xFFFF, 0xFFFF, ULMBCS_GRP_UNICODE)
415 static short FindLMBCSUniRange(char uniChar) {
418 while (uniChar > UniLMBCSGrpMap[index].uniEndRange) {
422 if (uniChar >= UniLMBCSGrpMap[index].uniStartRange) {
423 return UniLMBCSGrpMap[index].GrpType;
425 return ULMBCS_GRP_UNICODE;
429 * We also ask the creator of a converter to send in a preferred locale
430 * that we can use in resolving ambiguous mappings. They send the locale
431 * in as a string, and we map it, if possible, to one of the
432 * LMBCS groups. We use this table, and the associated code, to
435 * This table maps locale ID's to LMBCS opt groups.
436 * The default return is group 0x01. Note that for
437 * performance reasons, the table is sorted in
438 * increasing alphabetic order, with the notable
439 * exception of zhTW. This is to force the check
440 * for Traditional Chinese before dropping back to
442 * Note too that the Latin-1 groups have been
443 * commented out because it's the default, and
444 * this shortens the table, allowing a serial
445 * search to go quickly.
447 private static class _LocaleLMBCSGrpMap {
450 _LocaleLMBCSGrpMap(String LocaleID, short OptGroup) {
451 this.LocaleID = LocaleID;
452 this.OptGroup = OptGroup;
455 private static final _LocaleLMBCSGrpMap[] LocaleLMBCSGrpMap = {
456 new _LocaleLMBCSGrpMap("ar", ULMBCS_GRP_AR),
457 new _LocaleLMBCSGrpMap("be", ULMBCS_GRP_RU),
458 new _LocaleLMBCSGrpMap("bg", ULMBCS_GRP_L2),
459 // new _LocaleLMBCSGrpMap("ca", ULMBCS_GRP_L1),
460 new _LocaleLMBCSGrpMap("cs", ULMBCS_GRP_L2),
461 // new _LocaleLMBCSGrpMap("da", ULMBCS_GRP_L1),
462 // new _LocaleLMBCSGrpMap("de", ULMBCS_GRP_L1),
463 new _LocaleLMBCSGrpMap("el", ULMBCS_GRP_GR),
464 // new _LocaleLMBCSGrpMap("en", ULMBCS_GRP_L1),
465 // new _LocaleLMBCSGrpMap("es", ULMBCS_GRP_L1),
466 // new _LocaleLMBCSGrpMap("et", ULMBCS_GRP_L1),
467 // new _LocaleLMBCSGrpMap("fi", ULMBCS_GRP_L1),
468 // new _LocaleLMBCSGrpMap("fr", ULMBCS_GRP_L1),
469 new _LocaleLMBCSGrpMap("he", ULMBCS_GRP_HE),
470 new _LocaleLMBCSGrpMap("hu", ULMBCS_GRP_L2),
471 // new _LocaleLMBCSGrpMap("is", ULMBCS_GRP_L1),
472 // new _LocaleLMBCSGrpMap("it", ULMBCS_GRP_L1),
473 new _LocaleLMBCSGrpMap("iw", ULMBCS_GRP_HE),
474 new _LocaleLMBCSGrpMap("ja", ULMBCS_GRP_JA),
475 new _LocaleLMBCSGrpMap("ko", ULMBCS_GRP_KO),
476 // new _LocaleLMBCSGrpMap("lt", ULMBCS_GRP_L1),
477 // new _LocaleLMBCSGrpMap("lv", ULMBCS_GRP_L1),
478 new _LocaleLMBCSGrpMap("mk", ULMBCS_GRP_RU),
479 // new _LocaleLMBCSGrpMap("nl", ULMBCS_GRP_L1),
480 // new _LocaleLMBCSGrpMap("no", ULMBCS_GRP_L1),
481 new _LocaleLMBCSGrpMap("pl", ULMBCS_GRP_L2),
482 // new _LocaleLMBCSGrpMap("pt", ULMBCS_GRP_L1),
483 new _LocaleLMBCSGrpMap("ro", ULMBCS_GRP_L2),
484 new _LocaleLMBCSGrpMap("ru", ULMBCS_GRP_RU),
485 new _LocaleLMBCSGrpMap("sh", ULMBCS_GRP_L2),
486 new _LocaleLMBCSGrpMap("sk", ULMBCS_GRP_L2),
487 new _LocaleLMBCSGrpMap("sl", ULMBCS_GRP_L2),
488 new _LocaleLMBCSGrpMap("sq", ULMBCS_GRP_L2),
489 new _LocaleLMBCSGrpMap("sr", ULMBCS_GRP_RU),
490 // new _LocaleLMBCSGrpMap("sv", ULMBCS_GRP_L1),
491 new _LocaleLMBCSGrpMap("th", ULMBCS_GRP_TH),
492 new _LocaleLMBCSGrpMap("tr", ULMBCS_GRP_TR),
493 new _LocaleLMBCSGrpMap("uk", ULMBCS_GRP_RU),
494 // new _LocaleLMBCSGrpMap("vi", ULMBCS_GRP_L1),
495 new _LocaleLMBCSGrpMap("zhTW", ULMBCS_GRP_TW),
496 new _LocaleLMBCSGrpMap("zh", ULMBCS_GRP_CN),
497 new _LocaleLMBCSGrpMap(null, ULMBCS_GRP_L1)
499 static short FindLMBCSLocale(String LocaleID) {
502 if (LocaleID == null) {
506 while (LocaleLMBCSGrpMap[index].LocaleID != null) {
507 if (LocaleLMBCSGrpMap[index].LocaleID == LocaleID) {
508 return LocaleLMBCSGrpMap[index].OptGroup;
509 } else if (LocaleLMBCSGrpMap[index].LocaleID.compareTo(LocaleID) > 0){
514 return ULMBCS_GRP_L1;
518 * Before we get to the main body of code, here's how we hook up the rest
519 * of ICU. ICU converters are required to define a structure that includes
520 * some function pointers, and some common data, in the style of a C++
521 * vtable. There is also room in there for converter-specific data. LMBCS
522 * uses that converter-specific data to keep track of the 12 subconverters
523 * we use, the optimization group, and the group (if any) that matches the
524 * locale. We have one structure instantiated for each of the 12 possible
525 * optimization groups.
527 private class UConverterDataLMBCS {
528 UConverterSharedData[] OptGrpConverter; /* Converter per Opt. grp. */
529 short OptGroup; /* default Opt. grp. for this LMBCS session */
530 short localeConverterIndex; /* reasonable locale match for index */
531 CharsetDecoderMBCS decoder;
532 CharsetEncoderMBCS encoder;
534 UConverterDataLMBCS() {
535 OptGrpConverter = new UConverterSharedData[ULMBCS_GRP_LAST + 1];
536 charset = (CharsetMBCS)CharsetICU.forNameICU("ibm-850");
537 encoder = (CharsetEncoderMBCS)charset.newEncoder();
538 decoder = (CharsetDecoderMBCS)charset.newDecoder();
542 private UConverterDataLMBCS extraInfo; /* extraInfo in ICU4C implementation */
544 public CharsetLMBCS(String icuCanonicalName, String javaCanonicalName, String[] aliases) {
545 super(icuCanonicalName, javaCanonicalName, aliases);
546 maxBytesPerChar = ULMBCS_CHARSIZE_MAX;
550 extraInfo = new UConverterDataLMBCS();
552 for (int i = 0; i <= ULMBCS_GRP_LAST; i++) {
553 if (OptGroupByteToCPName[i] != null) {
554 extraInfo.OptGrpConverter[i] = ((CharsetMBCS)CharsetICU.forNameICU(OptGroupByteToCPName[i])).sharedData;
558 //get the Opt Group number for the LMBCS converter
559 int option = Integer.parseInt(icuCanonicalName.substring(6));
560 extraInfo.OptGroup = (short)option;
561 extraInfo.localeConverterIndex = FindLMBCSLocale(ULocale.getDefault().getBaseName());
564 class CharsetDecoderLMBCS extends CharsetDecoderICU {
565 public CharsetDecoderLMBCS(CharsetICU cs) {
570 protected void implReset() {
574 /* A function to call when we are looking at the Unicode group byte in LMBCS */
575 private char GetUniFromLMBCSUni(ByteBuffer ppLMBCSin) {
576 short HighCh = (short)(ppLMBCSin.get() & UConverterConstants.UNSIGNED_BYTE_MASK);
577 short LowCh = (short)(ppLMBCSin.get() & UConverterConstants.UNSIGNED_BYTE_MASK);
579 if (HighCh == ULMBCS_UNICOMPATZERO) {
581 LowCh = 0; /* zero-byte in LSB special character */
584 return (char)((HighCh << 8) | LowCh);
587 private int LMBCS_SimpleGetNextUChar(UConverterSharedData cnv, ByteBuffer source, int positionOffset, int length) {
592 extraInfo.charset.sharedData = cnv;
594 oldSourceLimit = source.limit();
595 oldSourcePos = source.position();
597 source.position(oldSourcePos + positionOffset);
598 source.limit(source.position() + length);
600 uniChar = extraInfo.decoder.simpleGetNextUChar(source, false);
602 source.limit(oldSourceLimit);
603 source.position(oldSourcePos);
607 /* Return the Unicode representation for the current LMBCS character. */
609 * Note: Because there is no U_TRUNCATED_CHAR_FOUND error code in ICU4J, we
610 * are going to use BufferOverFlow. The error will be handled correctly
611 * by the calling function.
613 private int LMBCSGetNextUCharWorker(ByteBuffer source, CoderResult[] err) {
614 int uniChar = 0; /* an output Unicode char */
615 short CurByte; /* A byte from the input stream */
618 if (!source.hasRemaining()) {
619 err[0] = CoderResult.malformedForLength(0);
622 /* Grab first byte & save address for error recovery */
623 CurByte = (short)(source.get() & UConverterConstants.UNSIGNED_BYTE_MASK);
626 * at entry of each if clause:
627 * 1. 'CurByte' points at the first byte of a LMBCS character
628 * 2. 'source' points to the next byte of the source stream after 'CurByte'
630 * the job of each if clause is:
631 * 1. set 'source' to the point at the beginning of the next char (not if LMBCS char is only 1 byte)
632 * 2. set 'uniChar' up with the right Unicode value, or set 'err' appropriately
634 /* First lets check the simple fixed values. */
635 if ((CurByte > ULMBCS_C0END && CurByte < ULMBCS_C1START) /* ascii range */ ||
636 CurByte == 0 || CurByte == ULMBCS_HT || CurByte == ULMBCS_CR || CurByte == ULMBCS_LF ||
637 CurByte == ULMBCS_123SYSTEMRANGE) {
642 UConverterSharedData cnv;
644 if (CurByte == ULMBCS_GRP_CTRL) { /* Control character group - no opt group update */
646 /* CHECK_SOURCE_LIMIT(1) */
647 if (source.position() + 1 > source.limit()) {
648 err[0] = CoderResult.OVERFLOW;
649 source.position(source.limit());
652 C0C1byte = (short)(source.get() & UConverterConstants.UNSIGNED_BYTE_MASK);
653 uniChar = (C0C1byte < ULMBCS_C1START) ? C0C1byte - ULMBCS_CTRLOFFSET : C0C1byte;
654 } else if (CurByte == ULMBCS_GRP_UNICODE) { /* Unicode Compatibility group: Big Endian UTF16 */
655 /* CHECK_SOURCE_LIMIT(2) */
656 if (source.position() + 2 > source.limit()) {
657 err[0] = CoderResult.OVERFLOW;
658 source.position(source.limit());
662 /* don't check for error indicators fffe/ffff below */
663 return GetUniFromLMBCSUni(source);
664 } else if (CurByte <= ULMBCS_CTRLOFFSET) {
666 if (group > ULMBCS_GRP_LAST || (cnv = extraInfo.OptGrpConverter[group]) == null) {
667 /* this is not a valid group byte - no converter */
668 err[0] = CoderResult.unmappableForLength(1);
669 } else if (group >= ULMBCS_DOUBLEOPTGROUP_START) {
670 /* CHECK_SOURCE_LIMIT(2) */
671 if (source.position() + 2 > source.limit()) {
672 err[0] = CoderResult.OVERFLOW;
673 source.position(source.limit());
677 /* check for LMBCS doubled-group-byte case */
678 if (source.get(source.position()) == group) {
681 uniChar = LMBCS_SimpleGetNextUChar(cnv, source, 0, 1);
685 uniChar = LMBCS_SimpleGetNextUChar(cnv, source, 0, 2);
689 } else { /* single byte conversion */
690 /* CHECK_SOURCE_LIMIT(1) */
691 if (source.position() + 1 > source.limit()) {
692 err[0] = CoderResult.OVERFLOW;
693 source.position(source.limit());
696 CurByte = (short)(source.get() & UConverterConstants.UNSIGNED_BYTE_MASK);
698 if (CurByte >= ULMBCS_C1START) {
699 uniChar = CharsetMBCS.MBCS_SINGLE_SIMPLE_GET_NEXT_BMP(cnv.mbcs, CurByte);
702 * The non-optimizable oddballs where there is an explicit byte
703 * AND the second byte is not in the upper ascii range
705 byte[] bytes = new byte[2];
707 cnv = extraInfo.OptGrpConverter[ULMBCS_GRP_EXCEPT];
709 /* Lookup value must include opt group */
710 bytes[0] = (byte)group;
711 bytes[1] = (byte)CurByte;
712 uniChar = LMBCS_SimpleGetNextUChar(cnv, ByteBuffer.wrap(bytes), 0, 2);
716 } else if (CurByte >= ULMBCS_C1START) { /* group byte is implicit */
717 group = extraInfo.OptGroup;
718 cnv = extraInfo.OptGrpConverter[group];
719 if (group >= ULMBCS_DOUBLEOPTGROUP_START) { /* double byte conversion */
720 if (CharsetMBCS.MBCS_ENTRY_IS_TRANSITION(cnv.mbcs.stateTable[0][CurByte]) /* isLeadByte */) {
721 /* CHECK_SOURCE_LIMIT(0) */
722 if (source.position() + 0 > source.limit()) {
723 err[0] = CoderResult.OVERFLOW;
724 source.position(source.limit());
728 /* let the MBCS conversion consume CurByte again */
729 uniChar = LMBCS_SimpleGetNextUChar(cnv, source, -1, 1);
731 /* CHECK_SOURCE_LIMIT(1) */
732 if (source.position() + 1 > source.limit()) {
733 err[0] = CoderResult.OVERFLOW;
734 source.position(source.limit());
738 /* let the MBCS conversion consume CurByte again */
739 uniChar = LMBCS_SimpleGetNextUChar(cnv, source, -1, 2);
743 uniChar = CharsetMBCS.MBCS_SINGLE_SIMPLE_GET_NEXT_BMP(cnv.mbcs, CurByte);
751 protected CoderResult decodeLoop(ByteBuffer source, CharBuffer target, IntBuffer offsets, boolean flush) {
752 CoderResult[] err = new CoderResult[1];
753 err[0] = CoderResult.UNDERFLOW;
754 byte[] LMBCS = new byte[ULMBCS_CHARSIZE_MAX * 2]; /* Increase the size for proper handling in subsequent calls to MBCS functions */
755 char uniChar; /* one output Unicode char */
756 int saveSource; /* beginning of current code point */
757 int errSource = 0; /* index to actual input in case an error occurs */
760 /* Process from source to limit, or until error */
761 while (err[0].isUnderflow() && source.hasRemaining() && target.hasRemaining()) {
762 saveSource = source.position(); /* beginning of current code point */
763 if (toULength > 0) { /* reassemble char from previous call */
764 int size_old = toULength;
765 ByteBuffer tmpSourceBuffer;
767 /* limit from source is either remainder of temp buffer, or user limit on source */
768 int size_new_maybe_1 = ULMBCS_CHARSIZE_MAX - size_old;
769 int size_new_maybe_2 = source.remaining();
770 int size_new = (size_new_maybe_1 < size_new_maybe_2) ? size_new_maybe_1 : size_new_maybe_2;
771 savebytes = (byte)(size_old + size_new);
772 for (int i = 0; i < savebytes; i++) {
774 LMBCS[i] = toUBytesArray[i];
776 LMBCS[i] = source.get();
779 tmpSourceBuffer = ByteBuffer.wrap(LMBCS);
780 tmpSourceBuffer.limit(savebytes);
781 uniChar = (char)LMBCSGetNextUCharWorker(tmpSourceBuffer, err);
782 source.position(saveSource + tmpSourceBuffer.position() - size_old);
783 errSource = saveSource - size_old;
785 if (err[0].isOverflow()) { /* err == U_TRUNCATED_CHAR_FOUND */
786 /* evil special case: source buffers so small a char spans more than 2 buffers */
787 toULength = savebytes;
788 for (int i = 0; i < savebytes; i++) {
789 toUBytesArray[i] = LMBCS[i];
791 source.position(source.limit());
792 err[0] = CoderResult.UNDERFLOW;
795 /* clear the partial-char marker */
799 errSource = saveSource;
800 uniChar = (char)LMBCSGetNextUCharWorker(source, err);
801 savebytes = (byte)(source.position() - saveSource);
804 if (err[0].isUnderflow()) {
805 if (uniChar < 0x0fffe) {
807 if (offsets != null) {
808 offsets.put(saveSource);
810 } else if (uniChar == 0xfffe) {
811 err[0] = CoderResult.unmappableForLength(source.position() - saveSource);
812 } else /* if (uniChar == 0xffff) */ {
813 err[0] = CoderResult.malformedForLength(source.position() - saveSource);
817 /* If target ran out before source, return over flow buffer error. */
818 if (err[0].isUnderflow() && source.hasRemaining() && !target.hasRemaining()) {
819 err[0] = CoderResult.OVERFLOW;
820 } else if (!err[0].isUnderflow()) {
821 /* If character incomplete or unmappable/illegal, store it in toUBytesArray[] */
822 toULength = savebytes;
824 for (int i = 0; i < savebytes; i++) {
825 toUBytesArray[i] = source.get(errSource + i);
828 if (err[0].isOverflow()) { /* err == U_TRUNCATED_CHAR_FOUND */
829 err[0] = CoderResult.UNDERFLOW;
836 class CharsetEncoderLMBCS extends CharsetEncoderICU {
837 public CharsetEncoderLMBCS(CharsetICU cs) {
838 super(cs, fromUSubstitution);
842 protected void implReset() {
846 * Here's the basic helper function that we use when converting from
847 * Unicode to LMBCS, and we suspect that a Unicode character will fit into
848 * one of the 12 groups. The return value is the number of bytes written
849 * starting at pStartLMBCS (if any).
851 @SuppressWarnings("fallthrough")
852 private int LMBCSConversionWorker(short group, byte[] LMBCS, char pUniChar, short[] lastConverterIndex, boolean[] groups_tried) {
854 UConverterSharedData xcnv = extraInfo.OptGrpConverter[group];
857 int[] value = new int[1];
860 extraInfo.charset.sharedData = xcnv;
861 bytesConverted = extraInfo.encoder.fromUChar32(pUniChar, value, false);
863 /* get the first result byte */
864 if (bytesConverted > 0) {
865 firstByte = (short)((value[0] >> ((bytesConverted - 1) * 8)) & UConverterConstants.UNSIGNED_BYTE_MASK);
867 /* most common failure mode is an unassigned character */
868 groups_tried[group] = true;
872 lastConverterIndex[0] = group;
875 * All initial byte values in lower ascii range should have been caught by now,
876 * except with the exception group.
879 /* use converted data: first write 0, 1 or two group bytes */
880 if (group != ULMBCS_GRP_EXCEPT && extraInfo.OptGroup != group) {
881 LMBCS[pLMBCS++] = (byte)group;
882 if (bytesConverted == 1 && group >= ULMBCS_DOUBLEOPTGROUP_START) {
883 LMBCS[pLMBCS++] = (byte)group;
887 /* don't emit control chars */
888 if (bytesConverted == 1 && firstByte < 0x20) {
892 /* then move over the converted data */
893 switch (bytesConverted) {
895 LMBCS[pLMBCS++] = (byte)(value[0] >> 24);
897 LMBCS[pLMBCS++] = (byte)(value[0] >> 16);
899 LMBCS[pLMBCS++] = (byte)(value[0] >> 8);
901 LMBCS[pLMBCS++] = (byte)value[0];
903 /* will never occur */
910 * This is a much simpler version of above, when we
911 * know we are writing LMBCS using the Unicode group.
913 private int LMBCSConvertUni(byte[] LMBCS, char uniChar) {
915 short LowCh = (short)(uniChar & UConverterConstants.UNSIGNED_BYTE_MASK);
916 short HighCh = (short)((uniChar >> 8) & UConverterConstants.UNSIGNED_BYTE_MASK);
918 LMBCS[index++] = (byte)ULMBCS_GRP_UNICODE;
921 LMBCS[index++] = (byte)ULMBCS_UNICOMPATZERO;
922 LMBCS[index++] = (byte)HighCh;
924 LMBCS[index++] = (byte)HighCh;
925 LMBCS[index++] = (byte)LowCh;
927 return ULMBCS_UNICODE_SIZE;
929 /* The main Unicode to LMBCS conversion function */
930 protected CoderResult encodeLoop(CharBuffer source, ByteBuffer target, IntBuffer offsets, boolean flush) {
931 CoderResult err = CoderResult.UNDERFLOW;
932 short[] lastConverterIndex = new short[1];
934 byte[] LMBCS = new byte[ULMBCS_CHARSIZE_MAX];
937 boolean[] groups_tried = new boolean[ULMBCS_GRP_LAST+1];
941 * Basic strategy: attempt to fill in local LMBCS 1-char buffer.(LMBCS)
942 * If that succeeds, see if it will all fit into the target & copy it over
945 * We try conversions in the following order:
946 * 1. Single-byte ascii & special fixed control chars (&null)
947 * 2. Look up group in table & try that (could b
950 * C) national encodeing
951 * or ambiguous SBCS or MBCS group (on to step 4...)
952 * 3. If its ambiguous, try this order:
953 * A) The optimization group
954 * B) The locale group
955 * C) The last group that succeeded with this string.
956 * D) every other group that's relevant
957 * E) If its single-byte ambiguous, try the exceptions group
958 * 4. And as a grand fallback: Unicode
961 short OldConverterIndex = 0;
963 while (source.hasRemaining() && err.isUnderflow()) {
964 OldConverterIndex = extraInfo.localeConverterIndex;
966 if (!target.hasRemaining()) {
967 err = CoderResult.OVERFLOW;
971 uniChar = source.get(source.position());
975 /* check cases in rough order of how common they are, for speed */
977 /* single-byte matches: strategy 1 */
978 if((uniChar>=0x80) && (uniChar<=0xff) && (uniChar!=0xB1) && (uniChar!=0xD7) && (uniChar!=0xF7) &&
979 (uniChar!=0xB0) && (uniChar!=0xB4) && (uniChar!=0xB6) && (uniChar!=0xA7) && (uniChar!=0xA8)) {
980 extraInfo.localeConverterIndex = ULMBCS_GRP_L1;
982 if (((uniChar > ULMBCS_C0END) && (uniChar < ULMBCS_C1START)) ||
983 uniChar == 0 || uniChar == ULMBCS_HT || uniChar == ULMBCS_CR ||
984 uniChar == ULMBCS_LF || uniChar == ULMBCS_123SYSTEMRANGE) {
985 LMBCS[pLMBCS++] = (byte)uniChar;
989 if (bytes_written == 0) {
990 /* Check by Unicode rage (Strategy 2) */
991 short group = FindLMBCSUniRange(uniChar);
992 if (group == ULMBCS_GRP_UNICODE) { /* (Strategy 2A) */
993 bytes_written = LMBCSConvertUni(LMBCS, uniChar);
994 } else if (group == ULMBCS_GRP_CTRL) { /* Strategy 2B) */
995 /* Handle control characters here */
996 if (uniChar <= ULMBCS_C0END) {
997 LMBCS[pLMBCS++] = ULMBCS_GRP_CTRL;
998 LMBCS[pLMBCS++] = (byte)(ULMBCS_CTRLOFFSET + uniChar);
999 } else if (uniChar >= ULMBCS_C1START && uniChar <= (ULMBCS_C1START + ULMBCS_CTRLOFFSET)) {
1000 LMBCS[pLMBCS++] = ULMBCS_GRP_CTRL;
1001 LMBCS[pLMBCS++] = (byte)uniChar;
1003 bytes_written = pLMBCS;
1004 } else if (group < ULMBCS_GRP_UNICODE) { /* (Strategy 2C) */
1005 /* a specific converter has been identified - use it */
1006 bytes_written = LMBCSConversionWorker(group, LMBCS, uniChar, lastConverterIndex, groups_tried);
1008 if (bytes_written == 0) { /* the ambiguous group cases (Strategy 3) */
1009 groups_tried = new boolean[ULMBCS_GRP_LAST+1];
1011 /* check for non-default optimization group (Strategy 3A) */
1012 if (extraInfo.OptGroup != 1 && ULMBCS_AMBIGUOUS_MATCH(group, extraInfo.OptGroup)) {
1013 if(extraInfo.localeConverterIndex < ULMBCS_DOUBLEOPTGROUP_START) {
1014 bytes_written = LMBCSConversionWorker (ULMBCS_GRP_L1, LMBCS, uniChar, lastConverterIndex, groups_tried);
1016 if(bytes_written == 0) {
1017 bytes_written = LMBCSConversionWorker (ULMBCS_GRP_EXCEPT, LMBCS, uniChar, lastConverterIndex, groups_tried);
1019 if(bytes_written == 0) {
1020 bytes_written = LMBCSConversionWorker (extraInfo.localeConverterIndex, LMBCS, uniChar, lastConverterIndex, groups_tried);
1023 bytes_written = LMBCSConversionWorker (extraInfo.localeConverterIndex, LMBCS, uniChar, lastConverterIndex, groups_tried);
1026 /* check for locale optimization group (Strategy 3B) */
1027 if (bytes_written == 0 && extraInfo.localeConverterIndex > 0 && ULMBCS_AMBIGUOUS_MATCH(group, extraInfo.localeConverterIndex)) {
1029 bytes_written = LMBCSConversionWorker(extraInfo.localeConverterIndex, LMBCS, uniChar, lastConverterIndex, groups_tried);
1031 /* check for last optimization group used for this string (Strategy 3C) */
1032 if (bytes_written == 0 && lastConverterIndex[0] > 0 && ULMBCS_AMBIGUOUS_MATCH(group, lastConverterIndex[0])) {
1033 bytes_written = LMBCSConversionWorker(lastConverterIndex[0], LMBCS, uniChar, lastConverterIndex, groups_tried);
1035 if (bytes_written == 0) {
1036 /* just check every possible matching converter (Strategy 3D) */
1041 grp_start = (group == ULMBCS_AMBIGUOUS_MBCS) ? ULMBCS_DOUBLEOPTGROUP_START : ULMBCS_GRP_L1;
1042 grp_end = (group == ULMBCS_AMBIGUOUS_MBCS) ? ULMBCS_GRP_LAST : ULMBCS_GRP_TH;
1044 if(group == ULMBCS_AMBIGUOUS_ALL) {
1045 grp_start = ULMBCS_GRP_L1;
1046 grp_end = ULMBCS_GRP_LAST;
1049 for (grp_ix = grp_start; grp_ix <= grp_end && bytes_written == 0; grp_ix++) {
1050 if (extraInfo.OptGrpConverter[grp_ix] != null && !groups_tried[grp_ix]) {
1051 bytes_written = LMBCSConversionWorker(grp_ix, LMBCS, uniChar, lastConverterIndex, groups_tried);
1055 * a final conversion fallback to the exceptions group if its likely
1056 * to be single byte (Strategy 3E)
1058 if (bytes_written == 0 && grp_start == ULMBCS_GRP_L1) {
1059 bytes_written = LMBCSConversionWorker(ULMBCS_GRP_EXCEPT, LMBCS, uniChar, lastConverterIndex, groups_tried);
1062 /* all of our other strategies failed. Fallback to Unicode. (Strategy 4) */
1063 if (bytes_written == 0) {
1064 bytes_written = LMBCSConvertUni(LMBCS, uniChar);
1068 /* we have a translation. increment source and write as much as possible to target */
1071 while (target.hasRemaining() && bytes_written > 0) {
1073 target.put(LMBCS[pLMBCS++]);
1074 if (offsets != null) {
1075 offsets.put(sourceIndex);
1079 if (bytes_written > 0) {
1081 * write any bytes that didn't fit in target to the error buffer,
1082 * common code will move this to target if we get called back with
1083 * enough target room
1085 err = CoderResult.OVERFLOW;
1086 errorBufferLength = bytes_written;
1087 for (int i = 0; bytes_written > 0; i++, bytes_written--) {
1088 errorBuffer[i] = LMBCS[pLMBCS++];
1091 extraInfo.localeConverterIndex = OldConverterIndex;
1097 public CharsetDecoder newDecoder() {
1098 return new CharsetDecoderLMBCS(this);
1101 public CharsetEncoder newEncoder() {
1102 return new CharsetEncoderLMBCS(this);
1105 void getUnicodeSetImpl(UnicodeSet setFillIn, int which){
1106 getCompleteUnicodeSet(setFillIn);
1108 private byte[] fromUSubstitution = new byte[]{ 0x3F };