1 /*
2  * Copyright 2017 Hugh McMaster
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * This library is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with this library; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
17  */
18 
19 #include <windows.h>
20 #include <errno.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 
24 #include <wine/debug.h>
25 #include <wine/heap.h>
26 
27 #include "reg.h"
28 
29 WINE_DEFAULT_DEBUG_CHANNEL(reg);
30 
31 static WCHAR *GetWideString(const char *strA)
32 {
33     if (strA)
34     {
35         WCHAR *strW;
36         int len = MultiByteToWideChar(CP_ACP, 0, strA, -1, NULL, 0);
37 
38         strW = heap_xalloc(len * sizeof(WCHAR));
39         MultiByteToWideChar(CP_ACP, 0, strA, -1, strW, len);
40         return strW;
41     }
42     return NULL;
43 }
44 
45 static WCHAR *GetWideStringN(const char *strA, int size, DWORD *len)
46 {
47     if (strA)
48     {
49         WCHAR *strW;
50         *len = MultiByteToWideChar(CP_ACP, 0, strA, size, NULL, 0);
51 
52         strW = heap_xalloc(*len * sizeof(WCHAR));
53         MultiByteToWideChar(CP_ACP, 0, strA, size, strW, *len);
54         return strW;
55     }
56     *len = 0;
57     return NULL;
58 }
59 
60 static WCHAR *(*get_line)(FILE *);
61 
62 /* parser definitions */
63 enum parser_state
64 {
65     HEADER,              /* parsing the registry file version header */
66     PARSE_WIN31_LINE,    /* parsing a Windows 3.1 registry line */
67     LINE_START,          /* at the beginning of a registry line */
68     KEY_NAME,            /* parsing a key name */
69     DELETE_KEY,          /* deleting a registry key */
70     DEFAULT_VALUE_NAME,  /* parsing a default value name */
71     QUOTED_VALUE_NAME,   /* parsing a double-quoted value name */
72     DATA_START,          /* preparing for data parsing operations */
73     DELETE_VALUE,        /* deleting a registry value */
74     DATA_TYPE,           /* parsing the registry data type */
75     STRING_DATA,         /* parsing REG_SZ data */
76     DWORD_DATA,          /* parsing DWORD data */
77     HEX_DATA,            /* parsing REG_BINARY, REG_NONE, REG_EXPAND_SZ or REG_MULTI_SZ data */
78     EOL_BACKSLASH,       /* preparing to parse multiple lines of hex data */
79     HEX_MULTILINE,       /* parsing multiple lines of hex data */
80     UNKNOWN_DATA,        /* parsing an unhandled or invalid data type */
81     SET_VALUE,           /* adding a value to the registry */
82     NB_PARSER_STATES
83 };
84 
85 struct parser
86 {
87     FILE              *file;           /* pointer to a registry file */
88     WCHAR              two_wchars[2];  /* first two characters from the encoding check */
89     BOOL               is_unicode;     /* parsing Unicode or ASCII data */
90     short int          reg_version;    /* registry file version */
91     HKEY               hkey;           /* current registry key */
92     WCHAR             *key_name;       /* current key name */
93     WCHAR             *value_name;     /* value name */
94     DWORD              parse_type;     /* generic data type for parsing */
95     DWORD              data_type;      /* data type */
96     void              *data;           /* value data */
97     DWORD              data_size;      /* size of the data (in bytes) */
98     BOOL               backslash;      /* TRUE if the current line contains a backslash */
99     enum parser_state  state;          /* current parser state */
100 };
101 
102 typedef WCHAR *(*parser_state_func)(struct parser *parser, WCHAR *pos);
103 
104 /* parser state machine functions */
105 static WCHAR *header_state(struct parser *parser, WCHAR *pos);
106 static WCHAR *parse_win31_line_state(struct parser *parser, WCHAR *pos);
107 static WCHAR *line_start_state(struct parser *parser, WCHAR *pos);
108 static WCHAR *key_name_state(struct parser *parser, WCHAR *pos);
109 static WCHAR *delete_key_state(struct parser *parser, WCHAR *pos);
110 static WCHAR *default_value_name_state(struct parser *parser, WCHAR *pos);
111 static WCHAR *quoted_value_name_state(struct parser *parser, WCHAR *pos);
112 static WCHAR *data_start_state(struct parser *parser, WCHAR *pos);
113 static WCHAR *delete_value_state(struct parser *parser, WCHAR *pos);
114 static WCHAR *data_type_state(struct parser *parser, WCHAR *pos);
115 static WCHAR *string_data_state(struct parser *parser, WCHAR *pos);
116 static WCHAR *dword_data_state(struct parser *parser, WCHAR *pos);
117 static WCHAR *hex_data_state(struct parser *parser, WCHAR *pos);
118 static WCHAR *eol_backslash_state(struct parser *parser, WCHAR *pos);
119 static WCHAR *hex_multiline_state(struct parser *parser, WCHAR *pos);
120 static WCHAR *unknown_data_state(struct parser *parser, WCHAR *pos);
121 static WCHAR *set_value_state(struct parser *parser, WCHAR *pos);
122 
123 static const parser_state_func parser_funcs[NB_PARSER_STATES] =
124 {
125     header_state,              /* HEADER */
126     parse_win31_line_state,    /* PARSE_WIN31_LINE */
127     line_start_state,          /* LINE_START */
128     key_name_state,            /* KEY_NAME */
129     delete_key_state,          /* DELETE_KEY */
130     default_value_name_state,  /* DEFAULT_VALUE_NAME */
131     quoted_value_name_state,   /* QUOTED_VALUE_NAME */
132     data_start_state,          /* DATA_START */
133     delete_value_state,        /* DELETE_VALUE */
134     data_type_state,           /* DATA_TYPE */
135     string_data_state,         /* STRING_DATA */
136     dword_data_state,          /* DWORD_DATA */
137     hex_data_state,            /* HEX_DATA */
138     eol_backslash_state,       /* EOL_BACKSLASH */
139     hex_multiline_state,       /* HEX_MULTILINE */
140     unknown_data_state,        /* UNKNOWN_DATA */
141     set_value_state,           /* SET_VALUE */
142 };
143 
144 /* set the new parser state and return the previous one */
145 static inline enum parser_state set_state(struct parser *parser, enum parser_state state)
146 {
147     enum parser_state ret = parser->state;
148     parser->state = state;
149     return ret;
150 }
151 
152 /******************************************************************************
153  * Converts a hex representation of a DWORD into a DWORD.
154  */
155 static BOOL convert_hex_to_dword(WCHAR *str, DWORD *dw)
156 {
157     WCHAR *p, *end;
158     int count = 0;
159 
160     while (*str == ' ' || *str == '\t') str++;
161     if (!*str) goto error;
162 
163     p = str;
164     while (iswxdigit(*p))
165     {
166         count++;
167         p++;
168     }
169     if (count > 8) goto error;
170 
171     end = p;
172     while (*p == ' ' || *p == '\t') p++;
173     if (*p && *p != ';') goto error;
174 
175     *end = 0;
176     *dw = wcstoul(str, &end, 16);
177     return TRUE;
178 
179 error:
180     return FALSE;
181 }
182 
183 /******************************************************************************
184  * Converts comma-separated hex data into a binary string and modifies
185  * the input parameter to skip the concatenating backslash, if found.
186  *
187  * Returns TRUE or FALSE to indicate whether parsing was successful.
188  */
189 static BOOL convert_hex_csv_to_hex(struct parser *parser, WCHAR **str)
190 {
191     size_t size;
192     BYTE *d;
193     WCHAR *s;
194 
195     parser->backslash = FALSE;
196 
197     /* The worst case is 1 digit + 1 comma per byte */
198     size = ((lstrlenW(*str) + 1) / 2) + parser->data_size;
199     parser->data = heap_xrealloc(parser->data, size);
200 
201     s = *str;
202     d = (BYTE *)parser->data + parser->data_size;
203 
204     while (*s)
205     {
206         WCHAR *end;
207         unsigned long wc;
208 
209         wc = wcstoul(s, &end, 16);
210         if (wc > 0xff) return FALSE;
211 
212         if (s == end && wc == 0)
213         {
214             while (*end == ' ' || *end == '\t') end++;
215             if (*end == '\\')
216             {
217                 parser->backslash = TRUE;
218                 *str = end + 1;
219                 return TRUE;
220             }
221             else if (*end == ';')
222                 return TRUE;
223             return FALSE;
224         }
225 
226         *d++ = wc;
227         parser->data_size++;
228 
229         if (*end && *end != ',')
230         {
231             while (*end == ' ' || *end == '\t') end++;
232             if (*end && *end != ';') return FALSE;
233             return TRUE;
234         }
235 
236         if (*end) end++;
237         s = end;
238     }
239 
240     return TRUE;
241 }
242 
243 /******************************************************************************
244  * Parses the data type of the registry value being imported and modifies
245  * the input parameter to skip the string representation of the data type.
246  *
247  * Returns TRUE or FALSE to indicate whether a data type was found.
248  */
249 static BOOL parse_data_type(struct parser *parser, WCHAR **line)
250 {
251     struct data_type { const WCHAR *tag; int len; int type; int parse_type; };
252 
253     static const WCHAR quote[] = {'"'};
254     static const WCHAR hex[] = {'h','e','x',':'};
255     static const WCHAR dword[] = {'d','w','o','r','d',':'};
256     static const WCHAR hexp[] = {'h','e','x','('};
257 
258     static const struct data_type data_types[] = {
259     /*    tag    len  type         parse type    */
260         { quote,  1,  REG_SZ,      REG_SZ },
261         { hex,    4,  REG_BINARY,  REG_BINARY },
262         { dword,  6,  REG_DWORD,   REG_DWORD },
263         { hexp,   4,  -1,          REG_BINARY }, /* REG_NONE, REG_EXPAND_SZ, REG_MULTI_SZ */
264         { NULL,   0,  0,           0 }
265     };
266 
267     const struct data_type *ptr;
268 
269     for (ptr = data_types; ptr->tag; ptr++)
270     {
271         if (wcsncmp(ptr->tag, *line, ptr->len))
272             continue;
273 
274         parser->parse_type = ptr->parse_type;
275         parser->data_type = ptr->parse_type;
276         *line += ptr->len;
277 
278         if (ptr->type == -1)
279         {
280             WCHAR *end;
281             DWORD val;
282 
283             if (!**line || towlower((*line)[1]) == 'x')
284                 return FALSE;
285 
286             /* "hex(xx):" is special */
287             val = wcstoul(*line, &end, 16);
288             if (*end != ')' || *(end + 1) != ':' || (val == ~0u && errno == ERANGE))
289                 return FALSE;
290 
291             parser->data_type = val;
292             *line = end + 2;
293         }
294         return TRUE;
295     }
296     return FALSE;
297 }
298 
299 /******************************************************************************
300  * Replaces escape sequences with their character equivalents and
301  * null-terminates the string on the first non-escaped double quote.
302  *
303  * Assigns a pointer to the remaining unparsed data in the line.
304  * Returns TRUE or FALSE to indicate whether a closing double quote was found.
305  */
306 static BOOL unescape_string(WCHAR *str, WCHAR **unparsed)
307 {
308     int str_idx = 0;            /* current character under analysis */
309     int val_idx = 0;            /* the last character of the unescaped string */
310     int len = lstrlenW(str);
311     BOOL ret;
312 
313     for (str_idx = 0; str_idx < len; str_idx++, val_idx++)
314     {
315         if (str[str_idx] == '\\')
316         {
317             str_idx++;
318             switch (str[str_idx])
319             {
320             case 'n':
321                 str[val_idx] = '\n';
322                 break;
323             case 'r':
324                 str[val_idx] = '\r';
325                 break;
326             case '0':
327                 str[val_idx] = '\0';
328                 break;
329             case '\\':
330             case '"':
331                 str[val_idx] = str[str_idx];
332                 break;
333             default:
334                 if (!str[str_idx]) return FALSE;
335                 output_message(STRING_ESCAPE_SEQUENCE, str[str_idx]);
336                 str[val_idx] = str[str_idx];
337                 break;
338             }
339         }
340         else if (str[str_idx] == '"')
341             break;
342         else
343             str[val_idx] = str[str_idx];
344     }
345 
346     ret = (str[str_idx] == '"');
347     *unparsed = str + str_idx + 1;
348     str[val_idx] = '\0';
349     return ret;
350 }
351 
352 static HKEY parse_key_name(WCHAR *key_name, WCHAR **key_path)
353 {
354     if (!key_name) return 0;
355 
356     *key_path = wcschr(key_name, '\\');
357     if (*key_path) (*key_path)++;
358 
359     return path_get_rootkey(key_name);
360 }
361 
362 static void close_key(struct parser *parser)
363 {
364     if (parser->hkey)
365     {
366         heap_free(parser->key_name);
367         parser->key_name = NULL;
368 
369         RegCloseKey(parser->hkey);
370         parser->hkey = NULL;
371     }
372 }
373 
374 static LONG open_key(struct parser *parser, WCHAR *path)
375 {
376     HKEY key_class;
377     WCHAR *key_path;
378     LONG res;
379 
380     close_key(parser);
381 
382     /* Get the registry class */
383     if (!path || !(key_class = parse_key_name(path, &key_path)))
384         return ERROR_INVALID_PARAMETER;
385 
386     res = RegCreateKeyExW(key_class, key_path, 0, NULL, REG_OPTION_NON_VOLATILE,
387                           KEY_ALL_ACCESS, NULL, &parser->hkey, NULL);
388 
389     if (res == ERROR_SUCCESS)
390     {
391         parser->key_name = heap_xalloc((lstrlenW(path) + 1) * sizeof(WCHAR));
392         lstrcpyW(parser->key_name, path);
393     }
394     else
395         parser->hkey = NULL;
396 
397     return res;
398 }
399 
400 static void free_parser_data(struct parser *parser)
401 {
402     if (parser->parse_type == REG_DWORD || parser->parse_type == REG_BINARY)
403         heap_free(parser->data);
404 
405     parser->data = NULL;
406     parser->data_size = 0;
407 }
408 
409 static void prepare_hex_string_data(struct parser *parser)
410 {
411     if (parser->data_type == REG_EXPAND_SZ || parser->data_type == REG_MULTI_SZ ||
412         parser->data_type == REG_SZ)
413     {
414         if (parser->is_unicode)
415         {
416             WCHAR *data = parser->data;
417             DWORD len = parser->data_size / sizeof(WCHAR);
418 
419             if (data[len - 1] != 0)
420             {
421                 data[len] = 0;
422                 parser->data_size += sizeof(WCHAR);
423             }
424         }
425         else
426         {
427             BYTE *data = parser->data;
428 
429             if (data[parser->data_size - 1] != 0)
430             {
431                 data[parser->data_size] = 0;
432                 parser->data_size++;
433             }
434 
435             parser->data = GetWideStringN(parser->data, parser->data_size, &parser->data_size);
436             parser->data_size *= sizeof(WCHAR);
437             heap_free(data);
438         }
439     }
440 }
441 
442 enum reg_versions {
443     REG_VERSION_31,
444     REG_VERSION_40,
445     REG_VERSION_50,
446     REG_VERSION_FUZZY,
447     REG_VERSION_INVALID
448 };
449 
450 static enum reg_versions parse_file_header(const WCHAR *s)
451 {
452     static const WCHAR header_31[] = {'R','E','G','E','D','I','T',0};
453     static const WCHAR header_40[] = {'R','E','G','E','D','I','T','4',0};
454     static const WCHAR header_50[] = {'W','i','n','d','o','w','s',' ',
455                                       'R','e','g','i','s','t','r','y',' ','E','d','i','t','o','r',' ',
456                                       'V','e','r','s','i','o','n',' ','5','.','0','0',0};
457 
458     while (*s == ' ' || *s == '\t') s++;
459 
460     if (!lstrcmpW(s, header_31))
461         return REG_VERSION_31;
462 
463     if (!lstrcmpW(s, header_40))
464         return REG_VERSION_40;
465 
466     if (!lstrcmpW(s, header_50))
467         return REG_VERSION_50;
468 
469     /* The Windows version accepts registry file headers beginning with "REGEDIT" and ending
470      * with other characters, as long as "REGEDIT" appears at the start of the line. For example,
471      * "REGEDIT 4", "REGEDIT9" and "REGEDIT4FOO" are all treated as valid file headers.
472      * In all such cases, however, the contents of the registry file are not imported.
473      */
474     if (!wcsncmp(s, header_31, 7)) /* "REGEDIT" without NUL */
475         return REG_VERSION_FUZZY;
476 
477     return REG_VERSION_INVALID;
478 }
479 
480 /* handler for parser HEADER state */
481 static WCHAR *header_state(struct parser *parser, WCHAR *pos)
482 {
483     WCHAR *line, *header;
484 
485     if (!(line = get_line(parser->file)))
486         return NULL;
487 
488     if (!parser->is_unicode)
489     {
490         header = heap_xalloc((lstrlenW(line) + 3) * sizeof(WCHAR));
491         header[0] = parser->two_wchars[0];
492         header[1] = parser->two_wchars[1];
493         lstrcpyW(header + 2, line);
494         parser->reg_version = parse_file_header(header);
495         heap_free(header);
496     }
497     else parser->reg_version = parse_file_header(line);
498 
499     switch (parser->reg_version)
500     {
501     case REG_VERSION_31:
502         set_state(parser, PARSE_WIN31_LINE);
503         break;
504     case REG_VERSION_40:
505     case REG_VERSION_50:
506         set_state(parser, LINE_START);
507         break;
508     default:
509         get_line(NULL); /* Reset static variables */
510         return NULL;
511     }
512 
513     return line;
514 }
515 
516 /* handler for parser PARSE_WIN31_LINE state */
517 static WCHAR *parse_win31_line_state(struct parser *parser, WCHAR *pos)
518 {
519     WCHAR *line, *value;
520     static WCHAR hkcr[] = {'H','K','E','Y','_','C','L','A','S','S','E','S','_','R','O','O','T'};
521     unsigned int key_end = 0;
522 
523     if (!(line = get_line(parser->file)))
524         return NULL;
525 
526     if (wcsncmp(line, hkcr, ARRAY_SIZE(hkcr)))
527         return line;
528 
529     /* get key name */
530     while (line[key_end] && !iswspace(line[key_end])) key_end++;
531 
532     value = line + key_end;
533     while (*value == ' ' || *value == '\t') value++;
534 
535     if (*value == '=') value++;
536     if (*value == ' ') value++; /* at most one space is skipped */
537 
538     line[key_end] = 0;
539 
540     if (open_key(parser, line) != ERROR_SUCCESS)
541     {
542         output_message(STRING_OPEN_KEY_FAILED, line);
543         return line;
544     }
545 
546     parser->value_name = NULL;
547     parser->data_type = REG_SZ;
548     parser->data = value;
549     parser->data_size = (lstrlenW(value) + 1) * sizeof(WCHAR);
550 
551     set_state(parser, SET_VALUE);
552     return value;
553 }
554 
555 /* handler for parser LINE_START state */
556 static WCHAR *line_start_state(struct parser *parser, WCHAR *pos)
557 {
558     WCHAR *line, *p;
559 
560     if (!(line = get_line(parser->file)))
561         return NULL;
562 
563     for (p = line; *p; p++)
564     {
565         switch (*p)
566         {
567         case '[':
568             set_state(parser, KEY_NAME);
569             return p + 1;
570         case '@':
571             set_state(parser, DEFAULT_VALUE_NAME);
572             return p;
573         case '"':
574             set_state(parser, QUOTED_VALUE_NAME);
575             return p + 1;
576         case ' ':
577         case '\t':
578             break;
579         default:
580             return p;
581         }
582     }
583 
584     return p;
585 }
586 
587 /* handler for parser KEY_NAME state */
588 static WCHAR *key_name_state(struct parser *parser, WCHAR *pos)
589 {
590     WCHAR *p = pos, *key_end;
591 
592     if (*p == ' ' || *p == '\t' || !(key_end = wcsrchr(p, ']')))
593         goto done;
594 
595     *key_end = 0;
596 
597     if (*p == '-')
598     {
599         set_state(parser, DELETE_KEY);
600         return p + 1;
601     }
602     else if (open_key(parser, p) != ERROR_SUCCESS)
603         output_message(STRING_OPEN_KEY_FAILED, p);
604 
605 done:
606     set_state(parser, LINE_START);
607     return p;
608 }
609 
610 /* handler for parser DELETE_KEY state */
611 static WCHAR *delete_key_state(struct parser *parser, WCHAR *pos)
612 {
613     WCHAR *p = pos;
614 
615     close_key(parser);
616 
617     if (*p == 'H' || *p == 'h')
618     {
619         HKEY root;
620         WCHAR *path;
621 
622         root = parse_key_name(p, &path);
623 
624         if (root && path && *path)
625             RegDeleteTreeW(root, path);
626     }
627 
628     set_state(parser, LINE_START);
629     return p;
630 }
631 
632 /* handler for parser DEFAULT_VALUE_NAME state */
633 static WCHAR *default_value_name_state(struct parser *parser, WCHAR *pos)
634 {
635     heap_free(parser->value_name);
636     parser->value_name = NULL;
637 
638     set_state(parser, DATA_START);
639     return pos + 1;
640 }
641 
642 /* handler for parser QUOTED_VALUE_NAME state */
643 static WCHAR *quoted_value_name_state(struct parser *parser, WCHAR *pos)
644 {
645     WCHAR *val_name = pos, *p;
646 
647     heap_free(parser->value_name);
648     parser->value_name = NULL;
649 
650     if (!unescape_string(val_name, &p))
651         goto invalid;
652 
653     /* copy the value name in case we need to parse multiple lines and the buffer is overwritten */
654     parser->value_name = heap_xalloc((lstrlenW(val_name) + 1) * sizeof(WCHAR));
655     lstrcpyW(parser->value_name, val_name);
656 
657     set_state(parser, DATA_START);
658     return p;
659 
660 invalid:
661     set_state(parser, LINE_START);
662     return val_name;
663 }
664 
665 /* handler for parser DATA_START state */
666 static WCHAR *data_start_state(struct parser *parser, WCHAR *pos)
667 {
668     WCHAR *p = pos;
669     unsigned int len;
670 
671     while (*p == ' ' || *p == '\t') p++;
672     if (*p != '=') goto invalid;
673     p++;
674     while (*p == ' ' || *p == '\t') p++;
675 
676     /* trim trailing whitespace */
677     len = lstrlenW(p);
678     while (len > 0 && (p[len - 1] == ' ' || p[len - 1] == '\t')) len--;
679     p[len] = 0;
680 
681     if (*p == '-')
682         set_state(parser, DELETE_VALUE);
683     else
684         set_state(parser, DATA_TYPE);
685     return p;
686 
687 invalid:
688     set_state(parser, LINE_START);
689     return p;
690 }
691 
692 /* handler for parser DELETE_VALUE state */
693 static WCHAR *delete_value_state(struct parser *parser, WCHAR *pos)
694 {
695     WCHAR *p = pos + 1;
696 
697     while (*p == ' ' || *p == '\t') p++;
698     if (*p && *p != ';') goto done;
699 
700     RegDeleteValueW(parser->hkey, parser->value_name);
701 
702 done:
703     set_state(parser, LINE_START);
704     return p;
705 }
706 
707 /* handler for parser DATA_TYPE state */
708 static WCHAR *data_type_state(struct parser *parser, WCHAR *pos)
709 {
710     WCHAR *line = pos;
711 
712     if (!parse_data_type(parser, &line))
713     {
714         set_state(parser, LINE_START);
715         return line;
716     }
717 
718     switch (parser->parse_type)
719     {
720     case REG_SZ:
721         set_state(parser, STRING_DATA);
722         break;
723     case REG_DWORD:
724         set_state(parser, DWORD_DATA);
725         break;
726     case REG_BINARY: /* all hex data types, including undefined */
727         set_state(parser, HEX_DATA);
728         break;
729     default:
730         set_state(parser, UNKNOWN_DATA);
731     }
732 
733     return line;
734 }
735 
736 /* handler for parser STRING_DATA state */
737 static WCHAR *string_data_state(struct parser *parser, WCHAR *pos)
738 {
739     WCHAR *line;
740 
741     parser->data = pos;
742 
743     if (!unescape_string(parser->data, &line))
744         goto invalid;
745 
746     while (*line == ' ' || *line == '\t') line++;
747     if (*line && *line != ';') goto invalid;
748 
749     parser->data_size = (lstrlenW(parser->data) + 1) * sizeof(WCHAR);
750 
751     set_state(parser, SET_VALUE);
752     return line;
753 
754 invalid:
755     free_parser_data(parser);
756     set_state(parser, LINE_START);
757     return line;
758 }
759 
760 /* handler for parser DWORD_DATA state */
761 static WCHAR *dword_data_state(struct parser *parser, WCHAR *pos)
762 {
763     WCHAR *line = pos;
764 
765     parser->data = heap_xalloc(sizeof(DWORD));
766 
767     if (!convert_hex_to_dword(line, parser->data))
768         goto invalid;
769 
770     parser->data_size = sizeof(DWORD);
771 
772     set_state(parser, SET_VALUE);
773     return line;
774 
775 invalid:
776     free_parser_data(parser);
777     set_state(parser, LINE_START);
778     return line;
779 }
780 
781 /* handler for parser HEX_DATA state */
782 static WCHAR *hex_data_state(struct parser *parser, WCHAR *pos)
783 {
784     WCHAR *line = pos;
785 
786     if (!*line)
787         goto set_value;
788 
789     if (!convert_hex_csv_to_hex(parser, &line))
790         goto invalid;
791 
792     if (parser->backslash)
793     {
794         set_state(parser, EOL_BACKSLASH);
795         return line;
796     }
797 
798     prepare_hex_string_data(parser);
799 
800 set_value:
801     set_state(parser, SET_VALUE);
802     return line;
803 
804 invalid:
805     free_parser_data(parser);
806     set_state(parser, LINE_START);
807     return line;
808 }
809 
810 /* handler for parser EOL_BACKSLASH state */
811 static WCHAR *eol_backslash_state(struct parser *parser, WCHAR *pos)
812 {
813     WCHAR *p = pos;
814 
815     while (*p == ' ' || *p == '\t') p++;
816     if (*p && *p != ';') goto invalid;
817 
818     set_state(parser, HEX_MULTILINE);
819     return pos;
820 
821 invalid:
822     free_parser_data(parser);
823     set_state(parser, LINE_START);
824     return p;
825 }
826 
827 /* handler for parser HEX_MULTILINE state */
828 static WCHAR *hex_multiline_state(struct parser *parser, WCHAR *pos)
829 {
830     WCHAR *line;
831 
832     if (!(line = get_line(parser->file)))
833     {
834         prepare_hex_string_data(parser);
835         set_state(parser, SET_VALUE);
836         return pos;
837     }
838 
839     while (*line == ' ' || *line == '\t') line++;
840     if (!*line || *line == ';') return line;
841 
842     if (!iswxdigit(*line)) goto invalid;
843 
844     set_state(parser, HEX_DATA);
845     return line;
846 
847 invalid:
848     free_parser_data(parser);
849     set_state(parser, LINE_START);
850     return line;
851 }
852 
853 /* handler for parser UNKNOWN_DATA state */
854 static WCHAR *unknown_data_state(struct parser *parser, WCHAR *pos)
855 {
856     FIXME("Unknown registry data type [0x%x]\n", parser->data_type);
857 
858     set_state(parser, LINE_START);
859     return pos;
860 }
861 
862 /* handler for parser SET_VALUE state */
863 static WCHAR *set_value_state(struct parser *parser, WCHAR *pos)
864 {
865     RegSetValueExW(parser->hkey, parser->value_name, 0, parser->data_type,
866                    parser->data, parser->data_size);
867 
868     free_parser_data(parser);
869 
870     if (parser->reg_version == REG_VERSION_31)
871         set_state(parser, PARSE_WIN31_LINE);
872     else
873         set_state(parser, LINE_START);
874 
875     return pos;
876 }
877 
878 #define REG_VAL_BUF_SIZE  4096
879 
880 static WCHAR *get_lineA(FILE *fp)
881 {
882     static WCHAR *lineW;
883     static size_t size;
884     static char *buf, *next;
885     char *line;
886 
887     heap_free(lineW);
888 
889     if (!fp) goto cleanup;
890 
891     if (!size)
892     {
893         size = REG_VAL_BUF_SIZE;
894         buf = heap_xalloc(size);
895         *buf = 0;
896         next = buf;
897     }
898     line = next;
899 
900     while (next)
901     {
902         char *p = strpbrk(line, "\r\n");
903         if (!p)
904         {
905             size_t len, count;
906             len = strlen(next);
907             memmove(buf, next, len + 1);
908             if (size - len < 3)
909             {
910                 size *= 2;
911                 buf = heap_xrealloc(buf, size);
912             }
913             if (!(count = fread(buf + len, 1, size - len - 1, fp)))
914             {
915                 next = NULL;
916                 lineW = GetWideString(buf);
917                 return lineW;
918             }
919             buf[len + count] = 0;
920             next = buf;
921             line = buf;
922             continue;
923         }
924         next = p + 1;
925         if (*p == '\r' && *(p + 1) == '\n') next++;
926         *p = 0;
927         lineW = GetWideString(line);
928         return lineW;
929     }
930 
931 cleanup:
932     lineW = NULL;
933     if (size) heap_free(buf);
934     size = 0;
935     return NULL;
936 }
937 
938 static WCHAR *get_lineW(FILE *fp)
939 {
940     static size_t size;
941     static WCHAR *buf, *next;
942     WCHAR *line;
943 
944     if (!fp) goto cleanup;
945 
946     if (!size)
947     {
948         size = REG_VAL_BUF_SIZE;
949         buf = heap_xalloc(size * sizeof(WCHAR));
950         *buf = 0;
951         next = buf;
952     }
953     line = next;
954 
955     while (next)
956     {
957         static const WCHAR line_endings[] = {'\r','\n',0};
958         WCHAR *p = wcspbrk(line, line_endings);
959         if (!p)
960         {
961             size_t len, count;
962             len = lstrlenW(next);
963             memmove(buf, next, (len + 1) * sizeof(WCHAR));
964             if (size - len < 3)
965             {
966                 size *= 2;
967                 buf = heap_xrealloc(buf, size * sizeof(WCHAR));
968             }
969             if (!(count = fread(buf + len, sizeof(WCHAR), size - len - 1, fp)))
970             {
971                 next = NULL;
972                 return buf;
973             }
974             buf[len + count] = 0;
975             next = buf;
976             line = buf;
977             continue;
978         }
979         next = p + 1;
980         if (*p == '\r' && *(p + 1) == '\n') next++;
981         *p = 0;
982         return line;
983     }
984 
985 cleanup:
986     if (size) heap_free(buf);
987     size = 0;
988     return NULL;
989 }
990 
991 int reg_import(const WCHAR *filename)
992 {
993     FILE *fp;
994     static const WCHAR rb_mode[] = {'r','b',0};
995     BYTE s[2];
996     struct parser parser;
997     WCHAR *pos;
998 
999     fp = _wfopen(filename, rb_mode);
1000     if (!fp)
1001     {
1002         output_message(STRING_FILE_NOT_FOUND, filename);
1003         return 1;
1004     }
1005 
1006     if (fread(s, sizeof(WCHAR), 1, fp) != 1)
1007         goto error;
1008 
1009     parser.is_unicode = (s[0] == 0xff && s[1] == 0xfe);
1010     get_line = parser.is_unicode ? get_lineW : get_lineA;
1011 
1012     parser.file          = fp;
1013     parser.two_wchars[0] = s[0];
1014     parser.two_wchars[1] = s[1];
1015     parser.reg_version   = -1;
1016     parser.hkey          = NULL;
1017     parser.key_name      = NULL;
1018     parser.value_name    = NULL;
1019     parser.parse_type    = 0;
1020     parser.data_type     = 0;
1021     parser.data          = NULL;
1022     parser.data_size     = 0;
1023     parser.backslash     = FALSE;
1024     parser.state         = HEADER;
1025 
1026     pos = parser.two_wchars;
1027 
1028     /* parser main loop */
1029     while (pos)
1030         pos = (parser_funcs[parser.state])(&parser, pos);
1031 
1032     if (parser.reg_version == REG_VERSION_INVALID)
1033         goto error;
1034 
1035     heap_free(parser.value_name);
1036     close_key(&parser);
1037 
1038     fclose(fp);
1039     return 0;
1040 
1041 error:
1042     fclose(fp);
1043     return 1;
1044 }
1045