1 /* 2 * Copyright (c) 1997, 2013, 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. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "utilities/utf8.hpp" 27 28 // Assume the utf8 string is in legal form and has been 29 // checked in the class file parser/format checker. 30 char* UTF8::next(const char* str, jchar* value) { 31 unsigned const char *ptr = (const unsigned char *)str; 32 unsigned char ch, ch2, ch3; 33 int length = -1; /* bad length */ 34 jchar result; 35 switch ((ch = ptr[0]) >> 4) { 36 default: 37 result = ch; 38 length = 1; 39 break; 40 41 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF: 42 /* Shouldn't happen. */ 43 break; 44 45 case 0xC: case 0xD: 46 /* 110xxxxx 10xxxxxx */ 47 if (((ch2 = ptr[1]) & 0xC0) == 0x80) { 48 unsigned char high_five = ch & 0x1F; 49 unsigned char low_six = ch2 & 0x3F; 50 result = (high_five << 6) + low_six; 51 length = 2; 52 break; 53 } 54 break; 55 56 case 0xE: 57 /* 1110xxxx 10xxxxxx 10xxxxxx */ 58 if (((ch2 = ptr[1]) & 0xC0) == 0x80) { 59 if (((ch3 = ptr[2]) & 0xC0) == 0x80) { 60 unsigned char high_four = ch & 0x0f; 61 unsigned char mid_six = ch2 & 0x3f; 62 unsigned char low_six = ch3 & 0x3f; 63 result = (((high_four << 6) + mid_six) << 6) + low_six; 64 length = 3; 65 } 66 } 67 break; 68 } /* end of switch */ 69 70 if (length <= 0) { 71 *value = ptr[0]; /* default bad result; */ 72 return (char*)(ptr + 1); // make progress somehow 73 } 74 75 *value = result; 76 77 // The assert is correct but the .class file is wrong 78 // assert(UNICODE::utf8_size(result) == length, "checking reverse computation"); 79 return (char *)(ptr + length); 80 } 81 82 char* UTF8::next_character(const char* str, jint* value) { 83 unsigned const char *ptr = (const unsigned char *)str; 84 /* See if it's legal supplementary character: 85 11101101 1010xxxx 10xxxxxx 11101101 1011xxxx 10xxxxxx */ 86 if (is_supplementary_character(ptr)) { 87 *value = get_supplementary_character(ptr); 88 return (char *)(ptr + 6); 89 } 90 jchar result; 91 char* next_ch = next(str, &result); 92 *value = result; 93 return next_ch; 94 } 95 96 // Count bytes of the form 10xxxxxx and deduct this count 97 // from the total byte count. The utf8 string must be in 98 // legal form which has been verified in the format checker. 99 int UTF8::unicode_length(const char* str, int len) { 100 int num_chars = len; 101 for (int i = 0; i < len; i++) { 102 if ((str[i] & 0xC0) == 0x80) { 103 --num_chars; 104 } 105 } 106 return num_chars; 107 } 108 109 // Count bytes of the utf8 string except those in form 110 // 10xxxxxx which only appear in multibyte characters. 111 // The utf8 string must be in legal form and has been 112 // verified in the format checker. 113 int UTF8::unicode_length(const char* str) { 114 int num_chars = 0; 115 for (const char* p = str; *p; p++) { 116 if (((*p) & 0xC0) != 0x80) { 117 num_chars++; 118 } 119 } 120 return num_chars; 121 } 122 123 // Writes a jchar a utf8 and returns the end 124 static u_char* utf8_write(u_char* base, jchar ch) { 125 if ((ch != 0) && (ch <=0x7f)) { 126 base[0] = (u_char) ch; 127 return base + 1; 128 } 129 130 if (ch <= 0x7FF) { 131 /* 11 bits or less. */ 132 unsigned char high_five = ch >> 6; 133 unsigned char low_six = ch & 0x3F; 134 base[0] = high_five | 0xC0; /* 110xxxxx */ 135 base[1] = low_six | 0x80; /* 10xxxxxx */ 136 return base + 2; 137 } 138 /* possibly full 16 bits. */ 139 char high_four = ch >> 12; 140 char mid_six = (ch >> 6) & 0x3F; 141 char low_six = ch & 0x3f; 142 base[0] = high_four | 0xE0; /* 1110xxxx */ 143 base[1] = mid_six | 0x80; /* 10xxxxxx */ 144 base[2] = low_six | 0x80; /* 10xxxxxx */ 145 return base + 3; 146 } 147 148 void UTF8::convert_to_unicode(const char* utf8_str, jchar* unicode_str, int unicode_length) { 149 unsigned char ch; 150 const char *ptr = utf8_str; 151 int index = 0; 152 153 /* ASCII case loop optimization */ 154 for (; index < unicode_length; index++) { 155 if((ch = ptr[0]) > 0x7F) { break; } 156 unicode_str[index] = ch; 157 ptr = (const char *)(ptr + 1); 158 } 159 160 for (; index < unicode_length; index++) { 161 ptr = UTF8::next(ptr, &unicode_str[index]); 162 } 163 } 164 165 // returns the quoted ascii length of a 0-terminated utf8 string 166 int UTF8::quoted_ascii_length(const char* utf8_str, int utf8_length) { 167 const char *ptr = utf8_str; 168 const char* end = ptr + utf8_length; 169 int result = 0; 170 while (ptr < end) { 171 jchar c; 172 ptr = UTF8::next(ptr, &c); 173 if (c >= 32 && c < 127) { 174 result++; 175 } else { 176 result += 6; 177 } 178 } 179 return result; 180 } 181 182 // converts a utf8 string to quoted ascii 183 void UTF8::as_quoted_ascii(const char* utf8_str, int utf8_length, char* buf, int buflen) { 184 const char *ptr = utf8_str; 185 const char *utf8_end = ptr + utf8_length; 186 char* p = buf; 187 char* end = buf + buflen; 188 while (ptr < utf8_end) { 189 jchar c; 190 ptr = UTF8::next(ptr, &c); 191 if (c >= 32 && c < 127) { 192 if (p + 1 >= end) break; // string is truncated 193 *p++ = (char)c; 194 } else { 195 if (p + 6 >= end) break; // string is truncated 196 sprintf(p, "\\u%04x", c); 197 p += 6; 198 } 199 } 200 assert(p < end, "sanity"); 201 *p = '\0'; 202 } 203 204 205 const char* UTF8::from_quoted_ascii(const char* quoted_ascii_str) { 206 const char *ptr = quoted_ascii_str; 207 char* result = NULL; 208 while (*ptr != '\0') { 209 char c = *ptr; 210 if (c < 32 || c >= 127) break; 211 } 212 if (*ptr == '\0') { 213 // nothing to do so return original string 214 return quoted_ascii_str; 215 } 216 // everything up to this point was ok. 217 int length = ptr - quoted_ascii_str; 218 char* buffer = NULL; 219 for (int round = 0; round < 2; round++) { 220 while (*ptr != '\0') { 221 if (*ptr != '\\') { 222 if (buffer != NULL) { 223 buffer[length] = *ptr; 224 } 225 length++; 226 } else { 227 switch (ptr[1]) { 228 case 'u': { 229 ptr += 2; 230 jchar value=0; 231 for (int i=0; i<4; i++) { 232 char c = *ptr++; 233 switch (c) { 234 case '0': case '1': case '2': case '3': case '4': 235 case '5': case '6': case '7': case '8': case '9': 236 value = (value << 4) + c - '0'; 237 break; 238 case 'a': case 'b': case 'c': 239 case 'd': case 'e': case 'f': 240 value = (value << 4) + 10 + c - 'a'; 241 break; 242 case 'A': case 'B': case 'C': 243 case 'D': case 'E': case 'F': 244 value = (value << 4) + 10 + c - 'A'; 245 break; 246 default: 247 ShouldNotReachHere(); 248 } 249 } 250 if (buffer == NULL) { 251 char utf8_buffer[4]; 252 char* next = (char*)utf8_write((u_char*)utf8_buffer, value); 253 length += next - utf8_buffer; 254 } else { 255 char* next = (char*)utf8_write((u_char*)&buffer[length], value); 256 length += next - &buffer[length]; 257 } 258 break; 259 } 260 case 't': if (buffer != NULL) buffer[length] = '\t'; ptr += 2; length++; break; 261 case 'n': if (buffer != NULL) buffer[length] = '\n'; ptr += 2; length++; break; 262 case 'r': if (buffer != NULL) buffer[length] = '\r'; ptr += 2; length++; break; 263 case 'f': if (buffer != NULL) buffer[length] = '\f'; ptr += 2; length++; break; 264 default: 265 ShouldNotReachHere(); 266 } 267 } 268 } 269 if (round == 0) { 270 buffer = NEW_RESOURCE_ARRAY(char, length + 1); 271 ptr = quoted_ascii_str; 272 } else { 273 buffer[length] = '\0'; 274 } 275 } 276 return buffer; 277 } 278 279 280 // Returns NULL if 'c' it not found. This only works as long 281 // as 'c' is an ASCII character 282 const jbyte* UTF8::strrchr(const jbyte* base, int length, jbyte c) { 283 assert(length >= 0, "sanity check"); 284 assert(c >= 0, "does not work for non-ASCII characters"); 285 // Skip backwards in string until 'c' is found or end is reached 286 while(--length >= 0 && base[length] != c); 287 return (length < 0) ? NULL : &base[length]; 288 } 289 290 bool UTF8::equal(const jbyte* base1, int length1, const jbyte* base2, int length2) { 291 // Length must be the same 292 if (length1 != length2) return false; 293 for (int i = 0; i < length1; i++) { 294 if (base1[i] != base2[i]) return false; 295 } 296 return true; 297 } 298 299 bool UTF8::is_supplementary_character(const unsigned char* str) { 300 return ((str[0] & 0xFF) == 0xED) && ((str[1] & 0xF0) == 0xA0) && ((str[2] & 0xC0) == 0x80) 301 && ((str[3] & 0xFF) == 0xED) && ((str[4] & 0xF0) == 0xB0) && ((str[5] & 0xC0) == 0x80); 302 } 303 304 jint UTF8::get_supplementary_character(const unsigned char* str) { 305 return 0x10000 + ((str[1] & 0x0f) << 16) + ((str[2] & 0x3f) << 10) 306 + ((str[4] & 0x0f) << 6) + (str[5] & 0x3f); 307 } 308 309 310 //------------------------------------------------------------------------------------- 311 312 313 int UNICODE::utf8_size(jchar c) { 314 if ((0x0001 <= c) && (c <= 0x007F)) return 1; 315 if (c <= 0x07FF) return 2; 316 return 3; 317 } 318 319 int UNICODE::utf8_length(jchar* base, int length) { 320 int result = 0; 321 for (int index = 0; index < length; index++) { 322 jchar c = base[index]; 323 if ((0x0001 <= c) && (c <= 0x007F)) result += 1; 324 else if (c <= 0x07FF) result += 2; 325 else result += 3; 326 } 327 return result; 328 } 329 330 char* UNICODE::as_utf8(jchar* base, int length) { 331 int utf8_len = utf8_length(base, length); 332 u_char* buf = NEW_RESOURCE_ARRAY(u_char, utf8_len + 1); 333 char* result = as_utf8(base, length, (char*) buf, utf8_len + 1); 334 assert((int) strlen(result) == utf8_len, "length prediction must be correct"); 335 return result; 336 } 337 338 char* UNICODE::as_utf8(jchar* base, int length, char* buf, int buflen) { 339 u_char* p = (u_char*)buf; 340 for (int index = 0; index < length; index++) { 341 jchar c = base[index]; 342 buflen -= utf8_size(c); 343 if (buflen <= 0) break; // string is truncated 344 p = utf8_write(p, c); 345 } 346 *p = '\0'; 347 return buf; 348 } 349 350 void UNICODE::convert_to_utf8(const jchar* base, int length, char* utf8_buffer) { 351 for(int index = 0; index < length; index++) { 352 utf8_buffer = (char*)utf8_write((u_char*)utf8_buffer, base[index]); 353 } 354 *utf8_buffer = '\0'; 355 } 356 357 // returns the quoted ascii length of a unicode string 358 int UNICODE::quoted_ascii_length(jchar* base, int length) { 359 int result = 0; 360 for (int i = 0; i < length; i++) { 361 jchar c = base[i]; 362 if (c >= 32 && c < 127) { 363 result++; 364 } else { 365 result += 6; 366 } 367 } 368 return result; 369 } 370 371 // converts a utf8 string to quoted ascii 372 void UNICODE::as_quoted_ascii(const jchar* base, int length, char* buf, int buflen) { 373 char* p = buf; 374 char* end = buf + buflen; 375 for (int index = 0; index < length; index++) { 376 jchar c = base[index]; 377 if (c >= 32 && c < 127) { 378 if (p + 1 >= end) break; // string is truncated 379 *p++ = (char)c; 380 } else { 381 if (p + 6 >= end) break; // string is truncated 382 sprintf(p, "\\u%04x", c); 383 p += 6; 384 } 385 } 386 *p = '\0'; 387 } 388 389 #ifndef PRODUCT 390 void TestAsUtf8() { 391 char res[60]; 392 jchar str[20]; 393 394 for (int i = 0; i < 20; i++) { 395 str[i] = 0x0800; // char that is 2B in UTF-16 but 3B in UTF-8 396 } 397 str[19] = (jchar)'\0'; 398 399 // The resulting string in UTF-8 is 3*19 bytes long, but should be truncated 400 UNICODE::as_utf8(str, 19, res, 10); 401 assert(strlen(res) == 9, "string should be truncated here"); 402 403 UNICODE::as_utf8(str, 19, res, 18); 404 assert(strlen(res) == 15, "string should be truncated here"); 405 406 UNICODE::as_utf8(str, 19, res, 20); 407 assert(strlen(res) == 18, "string should be truncated here"); 408 409 // Test with an "unbounded" buffer 410 UNICODE::as_utf8(str, 19, res, INT_MAX); 411 assert(strlen(res) == 3*19, "string should end here"); 412 } 413 #endif