| File: | java-utils.c |
| Warning: | line 263, column 7 Although the value stored to 'i' is used in the enclosing expression, the value is never actually read from 'i' |
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| 1 | /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */ |
| 2 | |
| 3 | /* |
| 4 | * Grapa |
| 5 | * |
| 6 | * Copyright (C) 2006 The Free Software Foundation, Inc. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 21 | */ |
| 22 | |
| 23 | #include <config.h> |
| 24 | #include <fcntl.h> |
| 25 | #include <unistd.h> |
| 26 | #include <errno(*__errno_location ()).h> |
| 27 | #include <string.h> |
| 28 | #include <ctype.h> |
| 29 | #include <glib.h> |
| 30 | #include "java-utils.h" |
| 31 | |
| 32 | |
| 33 | /* |
| 34 | * The following code conforms to the JVM specification.(Java 2 Platform) |
| 35 | * For further changes to the classfile structure, please update the |
| 36 | * following macros. |
| 37 | */ |
| 38 | |
| 39 | |
| 40 | /* Tags that identify structures */ |
| 41 | |
| 42 | #define CONST_CLASS7 7 |
| 43 | #define CONST_FIELDREF9 9 |
| 44 | #define CONST_METHODREF10 10 |
| 45 | #define CONST_INTERFACEMETHODREF11 11 |
| 46 | #define CONST_STRING8 8 |
| 47 | #define CONST_INTEGER3 3 |
| 48 | #define CONST_FLOAT4 4 |
| 49 | #define CONST_LONG5 5 |
| 50 | #define CONST_DOUBLE6 6 |
| 51 | #define CONST_NAMEANDTYPE12 12 |
| 52 | #define CONST_UTF81 1 |
| 53 | |
| 54 | /* Sizes of structures */ |
| 55 | |
| 56 | #define CONST_CLASS_INFO2 2 |
| 57 | #define CONST_FIELDREF_INFO4 4 |
| 58 | #define CONST_METHODREF_INFO4 4 |
| 59 | #define CONST_INTERFACEMETHODREF_INFO4 4 |
| 60 | #define CONST_STRING_INFO2 2 |
| 61 | #define CONST_INTEGER_INFO4 4 |
| 62 | #define CONST_FLOAT_INFO4 4 |
| 63 | #define CONST_LONG_INFO8 8 |
| 64 | #define CONST_DOUBLE_INFO8 8 |
| 65 | #define CONST_NAMEANDTYPE_INFO4 4 |
| 66 | |
| 67 | |
| 68 | /* represents the utf8 strings in class file */ |
| 69 | struct utf_string |
| 70 | { |
| 71 | guint16 index; |
| 72 | guint16 length; |
| 73 | char *str; |
| 74 | }; |
| 75 | |
| 76 | /* structure that holds class information in a class file */ |
| 77 | struct class_info |
| 78 | { |
| 79 | guint16 index; |
| 80 | guint16 name_index; /* index into the utf_strings */ |
| 81 | }; |
| 82 | |
| 83 | typedef struct { |
| 84 | int fd; |
| 85 | |
| 86 | guint32 magic_no; /* 0xCAFEBABE (JVM Specification) :) */ |
| 87 | |
| 88 | guint16 major; /* versions */ |
| 89 | guint16 minor; |
| 90 | |
| 91 | guint16 const_pool_count; |
| 92 | GSList *const_pool_class; /* (const_pool_count - 1) elements of tye 'CONST_class_info' */ |
| 93 | GSList *const_pool_utf; /* (const_pool_count - 1) elements of type 'utf_strings' */ |
| 94 | |
| 95 | guint16 access_flags; |
| 96 | guint16 this_class; /* the index of the class the file is named after. */ |
| 97 | |
| 98 | #if 0 /* not needed */ |
| 99 | guint16 super_class; |
| 100 | guint16 interfaces_count; |
| 101 | guint16 *interfaces; |
| 102 | guint16 fields_count; |
| 103 | field_info *fields; |
| 104 | guint16 methods_count; |
| 105 | method_info *methods; |
| 106 | guint16 attributes_count; |
| 107 | attribute_info *attributes; |
| 108 | #endif |
| 109 | } JavaClassFile; |
| 110 | |
| 111 | |
| 112 | static JavaClassFile* |
| 113 | java_class_file_new (void) |
| 114 | { |
| 115 | JavaClassFile *cfile; |
| 116 | |
| 117 | cfile = g_new0 (JavaClassFile, 1)((JavaClassFile *) g_malloc0_n ((1), sizeof (JavaClassFile))); |
| 118 | cfile->fd = -1; |
| 119 | |
| 120 | return cfile; |
| 121 | } |
| 122 | |
| 123 | |
| 124 | static void |
| 125 | java_class_file_free (JavaClassFile *cfile) |
| 126 | { |
| 127 | GSList *scan; |
| 128 | |
| 129 | if (cfile->const_pool_class != NULL((void*)0)) |
| 130 | g_slist_free_full (cfile->const_pool_class, g_free); |
| 131 | |
| 132 | for (scan = cfile->const_pool_utf; scan ; scan = scan->next) { |
| 133 | struct utf_string *string = scan->data; |
| 134 | g_free (string->str); |
| 135 | } |
| 136 | |
| 137 | if (cfile->const_pool_utf != NULL((void*)0)) |
| 138 | g_slist_free_full (cfile->const_pool_utf, g_free); |
| 139 | |
| 140 | if (cfile->fd != -1) |
| 141 | close (cfile->fd); |
| 142 | |
| 143 | g_free (cfile); |
| 144 | } |
| 145 | |
| 146 | |
| 147 | /* The following function loads the utf8 strings and class structures from the |
| 148 | * class file. */ |
| 149 | static void |
| 150 | load_constant_pool_utfs (JavaClassFile *cfile) |
| 151 | { |
| 152 | guint8 tag; |
| 153 | guint16 i = 0; /* should be comparable with const_pool_count */ |
| 154 | |
| 155 | while ((i < cfile->const_pool_count - 1) && (read (cfile->fd, &tag, 1) != -1)) { |
| 156 | struct utf_string *txt = NULL((void*)0); |
| 157 | struct class_info *class = NULL((void*)0); |
| 158 | |
| 159 | switch (tag) { |
| 160 | case CONST_CLASS7: |
| 161 | class = g_new0 (struct class_info, 1)((struct class_info *) g_malloc0_n ((1), sizeof (struct class_info ))); |
| 162 | class->index = i + 1; |
| 163 | if (read (cfile->fd, &class->name_index, 2) != 2) { |
| 164 | g_free (class); |
| 165 | return; /* error reading */ |
| 166 | } |
| 167 | class->name_index = GUINT16_FROM_BE (class->name_index)(((((guint16) ( (guint16) ((guint16) (class->name_index) >> 8) | (guint16) ((guint16) (class->name_index) << 8) ))))); |
| 168 | cfile->const_pool_class = g_slist_append (cfile->const_pool_class, class); |
| 169 | break; |
| 170 | |
| 171 | case CONST_FIELDREF9: |
| 172 | lseek (cfile->fd, CONST_FIELDREF_INFO4, SEEK_CUR1); |
| 173 | break; |
| 174 | |
| 175 | case CONST_METHODREF10: |
| 176 | lseek (cfile->fd, CONST_METHODREF_INFO4, SEEK_CUR1); |
| 177 | break; |
| 178 | |
| 179 | case CONST_INTERFACEMETHODREF11: |
| 180 | lseek (cfile->fd, CONST_INTERFACEMETHODREF_INFO4, SEEK_CUR1); |
| 181 | break; |
| 182 | |
| 183 | case CONST_STRING8: |
| 184 | lseek (cfile->fd, CONST_STRING_INFO2, SEEK_CUR1); |
| 185 | break; |
| 186 | |
| 187 | case CONST_INTEGER3: |
| 188 | lseek (cfile->fd, CONST_INTEGER_INFO4, SEEK_CUR1); |
| 189 | break; |
| 190 | |
| 191 | case CONST_FLOAT4: |
| 192 | lseek (cfile->fd, CONST_FLOAT_INFO4, SEEK_CUR1); |
| 193 | break; |
| 194 | |
| 195 | case CONST_LONG5: |
| 196 | lseek (cfile->fd, CONST_LONG_INFO8, SEEK_CUR1); |
| 197 | break; |
| 198 | |
| 199 | case CONST_DOUBLE6: |
| 200 | lseek (cfile->fd, CONST_DOUBLE_INFO8, SEEK_CUR1); |
| 201 | break; |
| 202 | |
| 203 | case CONST_NAMEANDTYPE12: |
| 204 | lseek (cfile->fd, CONST_NAMEANDTYPE_INFO4, SEEK_CUR1); |
| 205 | break; |
| 206 | |
| 207 | case CONST_UTF81: |
| 208 | txt = g_new0 (struct utf_string, 1)((struct utf_string *) g_malloc0_n ((1), sizeof (struct utf_string ))); |
| 209 | txt->index = i + 1; |
| 210 | if (read (cfile->fd, &(txt->length), 2) == -1) { |
| 211 | g_free (txt); |
| 212 | return; /* error while reading */ |
| 213 | } |
| 214 | txt->length = GUINT16_FROM_BE (txt->length)(((((guint16) ( (guint16) ((guint16) (txt->length) >> 8) | (guint16) ((guint16) (txt->length) << 8)))))); |
| 215 | txt->str = g_new0 (char, txt->length)((char *) g_malloc0_n ((txt->length), sizeof (char))); |
| 216 | if (read (cfile->fd, txt->str, txt->length) == -1) { |
| 217 | g_free (txt); |
| 218 | return; /* error while reading */ |
| 219 | } |
| 220 | cfile->const_pool_utf = g_slist_append (cfile->const_pool_utf, txt); |
| 221 | break; |
| 222 | |
| 223 | default: |
| 224 | return; /* error - unknown tag in class file */ |
| 225 | break; |
| 226 | } |
| 227 | i++; |
| 228 | } |
| 229 | |
| 230 | #ifdef CAFE_ENABLE_DEBUG |
| 231 | g_print( "Number of Entries: %d\n", i ); |
| 232 | #endif |
| 233 | } |
| 234 | |
| 235 | |
| 236 | static char* |
| 237 | close_and_exit (JavaClassFile *cfile) |
| 238 | { |
| 239 | java_class_file_free (cfile); |
| 240 | return NULL((void*)0); |
| 241 | } |
| 242 | |
| 243 | |
| 244 | /* This function extracts the package name from a class file */ |
| 245 | char* |
| 246 | get_package_name_from_class_file (char *fname) |
| 247 | { |
| 248 | char *package = NULL((void*)0); |
| 249 | JavaClassFile *cfile; |
| 250 | guint16 length = 0, end = 0, utf_index = 0; |
| 251 | guint32 magic; |
| 252 | guint16 major, minor, count; |
| 253 | guint i = 0; |
| 254 | |
| 255 | if (! g_file_test (fname, G_FILE_TEST_EXISTS)) |
| 256 | return NULL((void*)0); |
| 257 | |
| 258 | cfile = java_class_file_new (); |
| 259 | cfile->fd = open (fname, O_RDONLY00); |
| 260 | if (cfile->fd == -1) |
| 261 | return close_and_exit (cfile); |
| 262 | |
| 263 | if ((i = read (cfile->fd, &magic, 4)) != 4) |
Although the value stored to 'i' is used in the enclosing expression, the value is never actually read from 'i' | |
| 264 | return close_and_exit (cfile); |
| 265 | cfile->magic_no = GUINT32_FROM_BE (magic)(((((guint32) ( (((guint32) (magic) & (guint32) 0x000000ffU ) << 24) | (((guint32) (magic) & (guint32) 0x0000ff00U ) << 8) | (((guint32) (magic) & (guint32) 0x00ff0000U ) >> 8) | (((guint32) (magic) & (guint32) 0xff000000U ) >> 24)))))); |
| 266 | |
| 267 | if (read (cfile->fd, &major, 2 ) != 2) |
| 268 | return close_and_exit (cfile); |
| 269 | cfile->major = GUINT16_FROM_BE (major)(((((guint16) ( (guint16) ((guint16) (major) >> 8) | (guint16 ) ((guint16) (major) << 8)))))); |
| 270 | |
| 271 | if (read (cfile->fd, &minor, 2) != 2) |
| 272 | return close_and_exit (cfile); |
| 273 | cfile->minor = GUINT16_FROM_BE (minor)(((((guint16) ( (guint16) ((guint16) (minor) >> 8) | (guint16 ) ((guint16) (minor) << 8)))))); |
| 274 | |
| 275 | if (read (cfile->fd, &count, 2) != 2) |
| 276 | return close_and_exit (cfile); |
| 277 | cfile->const_pool_count = GUINT16_FROM_BE(count)(((((guint16) ( (guint16) ((guint16) (count) >> 8) | (guint16 ) ((guint16) (count) << 8)))))); |
| 278 | load_constant_pool_utfs (cfile); |
| 279 | |
| 280 | if (read (cfile->fd, &cfile->access_flags, 2) != 2) |
| 281 | return close_and_exit (cfile); |
| 282 | cfile->access_flags = GUINT16_FROM_BE (cfile->access_flags)(((((guint16) ( (guint16) ((guint16) (cfile->access_flags) >> 8) | (guint16) ((guint16) (cfile->access_flags) << 8)))))); |
| 283 | |
| 284 | if (read (cfile->fd, &cfile->this_class, 2) != 2) |
| 285 | return close_and_exit (cfile); |
| 286 | cfile->this_class = GUINT16_FROM_BE(cfile->this_class)(((((guint16) ( (guint16) ((guint16) (cfile->this_class) >> 8) | (guint16) ((guint16) (cfile->this_class) << 8) ))))); |
| 287 | |
| 288 | /* now search for the class structure with index = cfile->this_class */ |
| 289 | |
| 290 | for (i = 0; (i < g_slist_length (cfile->const_pool_class)) && (utf_index == 0); i++ ) { |
| 291 | struct class_info *class = g_slist_nth_data (cfile->const_pool_class, i); |
| 292 | if (class->index == cfile->this_class) |
| 293 | utf_index = class->name_index; /* terminates loop */ |
| 294 | } |
| 295 | |
| 296 | /* now search for the utf8 string with index = utf_index */ |
| 297 | |
| 298 | for (i = 0; i < g_slist_length (cfile->const_pool_utf); i++) { |
| 299 | struct utf_string *data = g_slist_nth_data (cfile->const_pool_utf, i); |
| 300 | if (data->index == utf_index) { |
| 301 | package = g_strndup (data->str, data->length); |
| 302 | length = data->length; |
| 303 | break; |
| 304 | } |
| 305 | } |
| 306 | |
| 307 | if (package != NULL((void*)0)) { |
| 308 | int j; |
| 309 | for (j = length; (j >= 0) && (end == 0); j--) |
| 310 | if (package[j] == '/') |
| 311 | end = j; |
| 312 | char *package_padded = g_strndup (package, end); |
| 313 | g_free(package); |
| 314 | package = package_padded; |
| 315 | } |
| 316 | |
| 317 | java_class_file_free (cfile); |
| 318 | |
| 319 | return package; |
| 320 | } |
| 321 | |
| 322 | |
| 323 | /* This function consumes a comment from the java file |
| 324 | * multiline = TRUE implies that comment is multiline */ |
| 325 | static void |
| 326 | consume_comment (int fdesc, |
| 327 | gboolean multiline) |
| 328 | { |
| 329 | gboolean escaped = FALSE(0); |
| 330 | gboolean star = FALSE(0); |
| 331 | char ch; |
| 332 | |
| 333 | while (read (fdesc, &ch, 1) == 1) { |
| 334 | switch (ch) { |
| 335 | case '/': |
| 336 | if (escaped) |
| 337 | break; |
| 338 | else if (star) |
| 339 | return; |
| 340 | break; |
| 341 | |
| 342 | case '\n': |
| 343 | if (! multiline) |
| 344 | return; |
| 345 | break; |
| 346 | |
| 347 | case '*': |
| 348 | escaped = FALSE(0); |
| 349 | star = TRUE(!(0)); |
| 350 | break; |
| 351 | |
| 352 | case '\\': |
| 353 | escaped = ! escaped; |
| 354 | break; |
| 355 | |
| 356 | default: |
| 357 | escaped = FALSE(0); |
| 358 | star = FALSE(0); |
| 359 | break; |
| 360 | } |
| 361 | } |
| 362 | } |
| 363 | |
| 364 | |
| 365 | /* This function extracts package name from a java file */ |
| 366 | char* |
| 367 | get_package_name_from_java_file (char *fname) |
| 368 | { |
| 369 | char *package = NULL((void*)0); |
| 370 | JavaClassFile *cfile; |
| 371 | gboolean prev_char_is_bslash = FALSE(0); |
| 372 | gboolean valid_char_found = FALSE(0); |
| 373 | char ch; |
| 374 | |
| 375 | if (! g_file_test (fname, G_FILE_TEST_EXISTS)) |
| 376 | return NULL((void*)0); |
| 377 | |
| 378 | cfile = java_class_file_new (); |
| 379 | cfile->fd = open (fname, O_RDONLY00); |
| 380 | if (cfile->fd == -1) |
| 381 | return close_and_exit (cfile); |
| 382 | |
| 383 | while (! valid_char_found && (read (cfile->fd, &ch, 1) == 1)) { |
| 384 | switch (ch) { |
| 385 | case '/': |
| 386 | if (prev_char_is_bslash == TRUE(!(0))) { |
| 387 | consume_comment (cfile->fd, FALSE(0)); |
| 388 | prev_char_is_bslash = FALSE(0); |
| 389 | } |
| 390 | else |
| 391 | prev_char_is_bslash = TRUE(!(0)); |
| 392 | break; |
| 393 | |
| 394 | case '*': |
| 395 | if (prev_char_is_bslash == TRUE(!(0))) |
| 396 | consume_comment (cfile->fd, TRUE(!(0))); |
| 397 | prev_char_is_bslash = FALSE(0); |
| 398 | break; |
| 399 | |
| 400 | case ' ': |
| 401 | case '\t': |
| 402 | case '\r': |
| 403 | case '\n': |
| 404 | prev_char_is_bslash = FALSE(0); |
| 405 | break; |
| 406 | |
| 407 | default: |
| 408 | prev_char_is_bslash = FALSE(0); |
| 409 | valid_char_found = TRUE(!(0)); |
| 410 | break; |
| 411 | } |
| 412 | } |
| 413 | |
| 414 | if (ch == 'p') { |
| 415 | char first_valid_word[8] = ""; |
| 416 | |
| 417 | first_valid_word[0] = 'p'; |
| 418 | if (read (cfile->fd, &first_valid_word[1], 6) != 6) |
| 419 | return close_and_exit (cfile); |
| 420 | |
| 421 | first_valid_word[7] = 0; |
| 422 | if (g_ascii_strcasecmp (first_valid_word, "package") == 0) { |
| 423 | char buffer[500]; |
| 424 | int index = 0; |
| 425 | |
| 426 | while (read (cfile->fd, &ch, 1) == 1) { |
| 427 | if ((ch != ' ') && (ch != '\t')) |
| 428 | break; |
| 429 | } |
| 430 | do { |
| 431 | if (ch == ';') |
| 432 | break; |
| 433 | if (ch == '.') { |
| 434 | buffer[index++] = '/'; |
| 435 | } else if (isalnum (ch)((*__ctype_b_loc ())[(int) ((ch))] & (unsigned short int) _ISalnum) != 0) { |
| 436 | buffer[index++] = ch; |
| 437 | } else if ((ch == '_') || (ch == '$')) { |
| 438 | buffer[index++] = ch; |
| 439 | } else { |
| 440 | index = 0; |
| 441 | break; |
| 442 | } |
| 443 | } while (read (cfile->fd, &ch, 1) == 1); |
| 444 | buffer[index] = 0; |
| 445 | package = g_strdup (buffer)g_strdup_inline (buffer); |
| 446 | } |
| 447 | } |
| 448 | |
| 449 | java_class_file_free (cfile); |
| 450 | |
| 451 | return package; |
| 452 | } |