trunk/Src/wptNLS.c

/* wptNLS.cpp - W32 Native Language Support
 *      Copyright (C) 2001, 2002, 2003 Timo Schulz
 *      Copyright (C) 1995-1999 Free Software Foundation, Inc.
 *
 * This code based on the simple-gettext.c code from the GnuPG 
 * by Ulrich Drepper.
 *
 * WinPT is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License 
 * as published by the Free Software Foundation; either version 2 
 * of the License, or (at your option) any later version.
 *  
 * WinPT is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License 
 * along with WinPT; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <windows.h>

#include "wptTypes.h"
#include "wptNLS.h"

/* Missing W32 functions. */
static char *
w32_stpcpy (char *a,const char *b)
{
    while (*b)
        *a++ = *b++;
    *a = 0;
    return (char*)a;
}


/* The magic number of the GNU message catalog format.  */
#define MAGIC         0x950412de
#define MAGIC_SWAPPED 0xde120495

/* Revision number of the currently used .mo (binary) file format.  */
#define MO_REVISION_NUMBER 0


/* Header for binary .mo file format.  */
struct mo_file_header {
  u32 magic; /* The magic number.       */  
  u32 revision; /* The revision number of the file format.  */
  u32 nstrings; /* The number of strings pairs.  */  
  u32 orig_tab_offset; /* Offset of table with start offsets of original 
                          strings.  */
  u32 trans_tab_offset; /* Offset of table with start offsets of translation
                           strings.  */  
  u32 hash_tab_size; /* Size of hashing table.  */  
  u32 hash_tab_offset; /* Offset of first hashing entry.  */
};

struct string_desc {
  u32 length; /* Length of addressed string.  */  
  u32 offset; /* Offset of string in file.      */
};

struct loaded_domain {
  char *data;
  int must_swap;
  u32 nstrings;
  char *mapped;
  struct string_desc *orig_tab;
  struct string_desc *trans_tab;
  u32 hash_size;
  u32 *hash_tab;
};

static struct loaded_domain *the_domain;

static u32
do_swap_u32( u32 i )
{
  return (i << 24) | ((i & 0xff00) << 8) | ((i >> 8) & 0xff00) | (i >> 24);
}

#define SWAPIT(flag, data) ((flag) ? do_swap_u32(data) : (data) )


/* We assume to have `unsigned long int' value with at least 32 bits.  */
#define HASHWORDBITS 32

/* The so called `hashpjw' function by P.J. Weinberger
   [see Aho/Sethi/Ullman, COMPILERS: Principles, Techniques and Tools,
   1986, 1987 Bell Telephone Laboratories, Inc.]  */

static u32
hash_string( const char *str_param )
{
    unsigned long int hval, g;
    const char *str = str_param;

    hval = 0;
    while (*str != '\0') {
        hval <<= 4;
        hval += (unsigned long int) *str++;     
        g = hval & ((unsigned long int) 0xf << (HASHWORDBITS - 4));
        if (g != 0) {
            hval ^= g >> (HASHWORDBITS - 8);
            hval ^= g;  
        }
    }
    return hval;
} /* hash_string */


static struct loaded_domain *
load_domain( const char *filename )
{
    FILE *fp;
    size_t size;
    struct stat st;
    struct mo_file_header *data = NULL;
    struct loaded_domain *domain = NULL;
    size_t to_read;
    char *read_ptr;

    fp = fopen( filename, "rb" );
    if( !fp )
       return NULL; /* can't open the file */
    /* we must know about the size of the file */
    if( fstat( fileno(fp ), &st )
        || (size = (size_t)st.st_size) != st.st_size
        || size < sizeof (struct mo_file_header) ) {
        fclose( fp );   
        return NULL;
    }

    data = (struct mo_file_header *) malloc( size );
    if( !data ) {
        fclose( fp );
        return NULL; /* out of memory */
    }

    to_read = size;
    read_ptr = (char *) data;
    do {
        long int nb = fread( read_ptr, 1, to_read, fp );
        if( nb < to_read ) {
            fclose (fp);
            free(data); 
            return NULL; /* read error */
                
        }
        read_ptr += nb; 
        to_read -= nb;
    } while( to_read > 0 );
    fclose (fp);

    /* Using the magic number we can test whether it really is a message
     * catalog file.  */
    if( data->magic != MAGIC && data->magic != MAGIC_SWAPPED ) {
        /* The magic number is wrong: not a message catalog file.  */
        free( data );
        return NULL;
    }

    domain = (struct loaded_domain *)calloc( 1, sizeof *domain );
    if( !domain )  {
        free( data );   
        return NULL;
    }
    domain->data = (char *) data;
    domain->must_swap = data->magic != MAGIC;

    /* Fill in the information about the available tables.  */
    switch( SWAPIT(domain->must_swap, data->revision) ) {
      case 0:
          domain->nstrings = SWAPIT(domain->must_swap, data->nstrings);
          domain->orig_tab = (struct string_desc *)
              ((char *) data + SWAPIT(domain->must_swap, data->orig_tab_offset));
          domain->trans_tab = (struct string_desc *)
              ((char *) data + SWAPIT(domain->must_swap, data->trans_tab_offset));
          domain->hash_size = SWAPIT(domain->must_swap, data->hash_tab_size);   
          domain->hash_tab = (u32 *)    
              ((char *) data + SWAPIT(domain->must_swap, data->hash_tab_offset));       
          break;

      default: /* This is an invalid revision.  */
          free( data );
          free( domain );
          return NULL;
    }

    /* allocate an array to keep track of code page mappings */
    domain->mapped = (char *)calloc( 1, domain->nstrings );
    if( !domain->mapped ) {
        free( data );
        free( domain ); 
        return NULL;
    }

    return domain;
} /* load_domain */


/****************
 * Set the file used for translations.  Pass a NULL to disable
 * translation.  A new filename may be set at anytime.
 * WARNING: After changing the filename you shoudl not access any data
 *          retrieved by gettext().
 */
int
set_gettext_file( const char *filename, const char *nls_dir )
{
    struct loaded_domain *domain = NULL;

    if( filename && *filename ) {
        if( filename[0] == '/'     
            || ( isalpha(filename[0])            
            && filename[1] == ':'       
            && (filename[2] == '/' || filename[2] == '\\') )
           ) {
            /* absolute path - use it as is */      
            domain = load_domain( filename );
        }
        else { /* relative path - append ".mo" and get dir from the environment */
            char *buf = NULL;
            char *dir;
                
            dir = strdup( nls_dir );
            if( dir && (buf= (char *)malloc(strlen(dir)+strlen(filename)+1+3+1)) ) {
                strcpy(w32_stpcpy(w32_stpcpy(w32_stpcpy( buf, dir),"/"), filename),".mo");
                domain = load_domain( buf );                    
                free(buf);
            }
            free(dir);
        }
        if( !domain )
            return -1;
    }

    if( the_domain ) {
        free( the_domain->data );
        free( the_domain->mapped );
        free( the_domain );     
        the_domain = NULL;
    }
    the_domain = domain;
    return 0;
} /* set_gettext_file */


static const char*
get_string( struct loaded_domain *domain, u32 idx )
{
    char *p = domain->data + SWAPIT(domain->must_swap,
                                    domain->trans_tab[idx].offset);
    if( !domain->mapped[idx] ) {        
        domain->mapped[idx] = 1;                
    }
    return (const char*)p;
} /* get_string */


const char *
gettext( const char *msgid )
{
    struct loaded_domain *domain;
    size_t act = 0;
    size_t top, bottom;

    if( !(domain = the_domain) )        
        goto not_found;

    /* Locate the MSGID and its translation.  */
    if( domain->hash_size > 2 && domain->hash_tab ) {           
        /* Use the hashing table.  */           
        u32 len = strlen (msgid);       
        u32 hash_val = hash_string (msgid);     
        u32 idx = hash_val % domain->hash_size; 
        u32 incr = 1 + (hash_val % (domain->hash_size - 2));    
        u32 nstr = SWAPIT (domain->must_swap, domain->hash_tab[idx]);

        if ( !nstr ) /* Hash table entry is empty.  */  
            goto not_found;

                
        if( SWAPIT(domain->must_swap,   
            domain->orig_tab[nstr - 1].length) == len   
            && !strcmp( msgid,  
            domain->data + SWAPIT(domain->must_swap,
                                    domain->orig_tab[nstr - 1].offset)) )
                                    return get_string( domain, nstr - 1 );
        for(;;) {
            if (idx >= domain->hash_size - incr)
                idx -= domain->hash_size - incr;
            else
                idx += incr;
            nstr = SWAPIT(domain->must_swap, domain->hash_tab[idx]);
            if( !nstr ) 
                goto not_found; /* Hash table entry is empty.  */

            if ( SWAPIT(domain->must_swap,
                                domain->orig_tab[nstr - 1].length) == len
                                && !strcmp (msgid,
                                domain->data + SWAPIT(domain->must_swap,
                                           domain->orig_tab[nstr - 1].offset)))
                        
                                           return get_string( domain, nstr-1 );
        } /* NOTREACHED */
    }

    /* Now we try the default method:  binary search in the sorted
       array of messages.  */
    bottom = 0;
    top = domain->nstrings;
    while( bottom < top ) {             
        int cmp_val;
        
        act = (bottom + top) / 2;       
        cmp_val = strcmp(msgid, domain->data + SWAPIT(domain->must_swap,
                        domain->orig_tab[act].offset));
        if (cmp_val < 0)
            top = act;
        else if (cmp_val > 0)
            bottom = act + 1;
        else    
            return get_string( domain, act );
    }

not_found:
    return msgid;
} /* gettext */

/* Map the user specific language ID to a
   gettext conform language string.
   Example: LANG_GERMAN -> "de" */
const char*
get_gettext_langid (void)
{
    struct {
        const char *id;
        int langid;
    } lang_table[] = {
        {"de", LANG_GERMAN},
        {NULL, 0},
    };
    LANGID lang;
    int i;
    
    lang = GetUserDefaultLangID ();
    
    for (i=0; lang_table[i].id; i++) {
        if (PRIMARYLANGID (lang) == lang_table[i].langid)
            return lang_table[i].id;
    }
    return NULL;
}


/* XXX: this has to be placed in a .c file but not here */
#include <shlobj.h>

void _SHFree (void *p) 
{
    IMalloc *pm; 
    SHGetMalloc(&pm);
    if (pm) {
        pm->lpVtbl->Free(pm,p);
        pm->lpVtbl->Release(pm);
    } 
}
1	werner	36	/* wptNLS.cpp - W32 Native Language Support
2			* Copyright (C) 2001, 2002, 2003 Timo Schulz
3			* Copyright (C) 1995-1999 Free Software Foundation, Inc.
4			*
5			* This code based on the simple-gettext.c code from the GnuPG
6			* by Ulrich Drepper.
7			*
8			* WinPT is free software; you can redistribute it and/or
9			* modify it under the terms of the GNU General Public License
10			* as published by the Free Software Foundation; either version 2
11			* of the License, or (at your option) any later version.
12			*
13			* WinPT 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 GNU
16			* General Public License for more details.
17			*
18			* You should have received a copy of the GNU General Public License
19			* along with WinPT; if not, write to the Free Software Foundation,
20			* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21			*/
22
23			#ifdef HAVE_CONFIG_H
24			#include <config.h>
25			#endif
26
27			#include <stdio.h>
28			#include <stdio.h>
29			#include <string.h>
30			#include <ctype.h>
31			#include <errno.h>
32			#include <sys/types.h>
33			#include <sys/stat.h>
34			#include <windows.h>
35
36			#include "wptTypes.h"
37			#include "wptNLS.h"
38
39			/* Missing W32 functions. */
40			static char *
41	twoaday	69	w32_stpcpy (char a,const char b)
42	werner	36	{
43	twoaday	69	while (*b)
44	werner	36	a++ = b++;
45			*a = 0;
46			return (char*)a;
47			}
48
49	twoaday	69
50	werner	36	/* The magic number of the GNU message catalog format. */
51			#define MAGIC 0x950412de
52			#define MAGIC_SWAPPED 0xde120495
53
54			/* Revision number of the currently used .mo (binary) file format. */
55			#define MO_REVISION_NUMBER 0
56
57
58			/* Header for binary .mo file format. */
59			struct mo_file_header {
60			u32 magic; /* The magic number. */
61			u32 revision; /* The revision number of the file format. */
62			u32 nstrings; /* The number of strings pairs. */
63			u32 orig_tab_offset; /* Offset of table with start offsets of original
64			strings. */
65			u32 trans_tab_offset; /* Offset of table with start offsets of translation
66			strings. */
67			u32 hash_tab_size; /* Size of hashing table. */
68			u32 hash_tab_offset; /* Offset of first hashing entry. */
69			};
70
71			struct string_desc {
72			u32 length; /* Length of addressed string. */
73			u32 offset; /* Offset of string in file. */
74			};
75
76			struct loaded_domain {
77			char *data;
78			int must_swap;
79			u32 nstrings;
80			char *mapped;
81			struct string_desc *orig_tab;
82			struct string_desc *trans_tab;
83			u32 hash_size;
84			u32 *hash_tab;
85			};
86
87			static struct loaded_domain *the_domain;
88
89			static u32
90			do_swap_u32( u32 i )
91			{
92			return (i << 24) \| ((i & 0xff00) << 8) \| ((i >> 8) & 0xff00) \| (i >> 24);
93			}
94
95			#define SWAPIT(flag, data) ((flag) ? do_swap_u32(data) : (data) )
96
97
98			/* We assume to have `unsigned long int' value with at least 32 bits. */
99			#define HASHWORDBITS 32
100
101			/* The so called `hashpjw' function by P.J. Weinberger
102			[see Aho/Sethi/Ullman, COMPILERS: Principles, Techniques and Tools,
103			1986, 1987 Bell Telephone Laboratories, Inc.] */
104
105			static u32
106			hash_string( const char *str_param )
107			{
108			unsigned long int hval, g;
109			const char *str = str_param;
110
111			hval = 0;
112			while (*str != '\0') {
113			hval <<= 4;
114			hval += (unsigned long int) *str++;
115			g = hval & ((unsigned long int) 0xf << (HASHWORDBITS - 4));
116			if (g != 0) {
117			hval ^= g >> (HASHWORDBITS - 8);
118			hval ^= g;
119			}
120			}
121			return hval;
122			} /* hash_string */
123
124
125			static struct loaded_domain *
126			load_domain( const char *filename )
127			{
128			FILE *fp;
129			size_t size;
130			struct stat st;
131			struct mo_file_header *data = NULL;
132			struct loaded_domain *domain = NULL;
133			size_t to_read;
134			char *read_ptr;
135
136			fp = fopen( filename, "rb" );
137			if( !fp )
138			return NULL; /* can't open the file */
139			/* we must know about the size of the file */
140			if( fstat( fileno(fp ), &st )
141			\|\| (size = (size_t)st.st_size) != st.st_size
142			\|\| size < sizeof (struct mo_file_header) ) {
143			fclose( fp );
144			return NULL;
145			}
146
147			data = (struct mo_file_header *) malloc( size );
148			if( !data ) {
149			fclose( fp );
150			return NULL; /* out of memory */
151			}
152
153			to_read = size;
154			read_ptr = (char *) data;
155			do {
156			long int nb = fread( read_ptr, 1, to_read, fp );
157			if( nb < to_read ) {
158			fclose (fp);
159			free(data);
160			return NULL; /* read error */
161
162			}
163			read_ptr += nb;
164			to_read -= nb;
165			} while( to_read > 0 );
166			fclose (fp);
167
168			/* Using the magic number we can test whether it really is a message
169			* catalog file. */
170			if( data->magic != MAGIC && data->magic != MAGIC_SWAPPED ) {
171			/* The magic number is wrong: not a message catalog file. */
172			free( data );
173			return NULL;
174			}
175
176			domain = (struct loaded_domain )calloc( 1, sizeof domain );
177			if( !domain ) {
178			free( data );
179			return NULL;
180			}
181			domain->data = (char *) data;
182			domain->must_swap = data->magic != MAGIC;
183
184			/* Fill in the information about the available tables. */
185			switch( SWAPIT(domain->must_swap, data->revision) ) {
186			case 0:
187			domain->nstrings = SWAPIT(domain->must_swap, data->nstrings);
188			domain->orig_tab = (struct string_desc *)
189			((char *) data + SWAPIT(domain->must_swap, data->orig_tab_offset));
190			domain->trans_tab = (struct string_desc *)
191			((char *) data + SWAPIT(domain->must_swap, data->trans_tab_offset));
192			domain->hash_size = SWAPIT(domain->must_swap, data->hash_tab_size);
193			domain->hash_tab = (u32 *)
194			((char *) data + SWAPIT(domain->must_swap, data->hash_tab_offset));
195			break;
196
197			default: /* This is an invalid revision. */
198			free( data );
199			free( domain );
200			return NULL;
201			}
202
203			/* allocate an array to keep track of code page mappings */
204			domain->mapped = (char *)calloc( 1, domain->nstrings );
205			if( !domain->mapped ) {
206			free( data );
207			free( domain );
208			return NULL;
209			}
210
211			return domain;
212			} /* load_domain */
213
214
215			/****************
216			* Set the file used for translations. Pass a NULL to disable
217			* translation. A new filename may be set at anytime.
218			* WARNING: After changing the filename you shoudl not access any data
219			* retrieved by gettext().
220			*/
221			int
222			set_gettext_file( const char filename, const char nls_dir )
223			{
224			struct loaded_domain *domain = NULL;
225
226			if( filename && *filename ) {
227			if( filename[0] == '/'
228			\|\| ( isalpha(filename[0])
229			&& filename[1] == ':'
230			&& (filename[2] == '/' \|\| filename[2] == '\\') )
231			) {
232			/* absolute path - use it as is */
233			domain = load_domain( filename );
234			}
235			else { /* relative path - append ".mo" and get dir from the environment */
236			char *buf = NULL;
237			char *dir;
238
239			dir = strdup( nls_dir );
240			if( dir && (buf= (char *)malloc(strlen(dir)+strlen(filename)+1+3+1)) ) {
241	twoaday	69	strcpy(w32_stpcpy(w32_stpcpy(w32_stpcpy( buf, dir),"/"), filename),".mo");
242	werner	36	domain = load_domain( buf );
243			free(buf);
244			}
245			free(dir);
246			}
247			if( !domain )
248			return -1;
249			}
250
251			if( the_domain ) {
252			free( the_domain->data );
253			free( the_domain->mapped );
254			free( the_domain );
255			the_domain = NULL;
256			}
257			the_domain = domain;
258			return 0;
259			} /* set_gettext_file */
260
261
262			static const char*
263			get_string( struct loaded_domain *domain, u32 idx )
264			{
265			char *p = domain->data + SWAPIT(domain->must_swap,
266			domain->trans_tab[idx].offset);
267			if( !domain->mapped[idx] ) {
268			domain->mapped[idx] = 1;
269			}
270			return (const char*)p;
271			} /* get_string */
272
273	werner	48
274	werner	36	const char *
275			gettext( const char *msgid )
276			{
277			struct loaded_domain *domain;
278			size_t act = 0;
279			size_t top, bottom;
280
281			if( !(domain = the_domain) )
282			goto not_found;
283
284			/* Locate the MSGID and its translation. */
285			if( domain->hash_size > 2 && domain->hash_tab ) {
286			/* Use the hashing table. */
287			u32 len = strlen (msgid);
288			u32 hash_val = hash_string (msgid);
289			u32 idx = hash_val % domain->hash_size;
290			u32 incr = 1 + (hash_val % (domain->hash_size - 2));
291			u32 nstr = SWAPIT (domain->must_swap, domain->hash_tab[idx]);
292
293			if ( !nstr ) /* Hash table entry is empty. */
294			goto not_found;
295
296
297			if( SWAPIT(domain->must_swap,
298			domain->orig_tab[nstr - 1].length) == len
299			&& !strcmp( msgid,
300			domain->data + SWAPIT(domain->must_swap,
301			domain->orig_tab[nstr - 1].offset)) )
302			return get_string( domain, nstr - 1 );
303			for(;;) {
304			if (idx >= domain->hash_size - incr)
305			idx -= domain->hash_size - incr;
306			else
307			idx += incr;
308			nstr = SWAPIT(domain->must_swap, domain->hash_tab[idx]);
309			if( !nstr )
310			goto not_found; /* Hash table entry is empty. */
311
312			if ( SWAPIT(domain->must_swap,
313			domain->orig_tab[nstr - 1].length) == len
314			&& !strcmp (msgid,
315			domain->data + SWAPIT(domain->must_swap,
316			domain->orig_tab[nstr - 1].offset)))
317
318			return get_string( domain, nstr-1 );
319			} /* NOTREACHED */
320			}
321
322			/* Now we try the default method: binary search in the sorted
323			array of messages. */
324			bottom = 0;
325			top = domain->nstrings;
326			while( bottom < top ) {
327			int cmp_val;
328
329			act = (bottom + top) / 2;
330			cmp_val = strcmp(msgid, domain->data + SWAPIT(domain->must_swap,
331			domain->orig_tab[act].offset));
332			if (cmp_val < 0)
333			top = act;
334			else if (cmp_val > 0)
335			bottom = act + 1;
336			else
337			return get_string( domain, act );
338			}
339
340			not_found:
341			return msgid;
342			} /* gettext */
343
344	twoaday	76	/* Map the user specific language ID to a
345			gettext conform language string.
346			Example: LANG_GERMAN -> "de" */
347			const char*
348			get_gettext_langid (void)
349			{
350			struct {
351			const char *id;
352			int langid;
353			} lang_table[] = {
354			{"de", LANG_GERMAN},
355			{NULL, 0},
356			};
357			LANGID lang;
358			int i;
359
360			lang = GetUserDefaultLangID ();
361
362			for (i=0; lang_table[i].id; i++) {
363			if (PRIMARYLANGID (lang) == lang_table[i].langid)
364			return lang_table[i].id;
365			}
366			return NULL;
367			}
368	werner	36
369	twoaday	76
370	werner	36	/* XXX: this has to be placed in a .c file but not here */
371			#include <shlobj.h>
372
373			void _SHFree (void *p)
374			{
375			IMalloc *pm;
376			SHGetMalloc(&pm);
377			if (pm) {
378			pm->lpVtbl->Free(pm,p);
379			pm->lpVtbl->Release(pm);
380			}
381			}