trunk/src/OENLS.c

/* wptNLS.c - W32 Native Language Support
 *      Copyright (C) 2001, 2002, 2003, 2006 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.
 *
 * This is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2 
 * of the License, or (at your option) any later version.
 *  
 * This software 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.
 */

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

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

#include "gpgme.h"
#include "GPGOE.h"


/* 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

#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.]  */

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

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

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


/* The current domain. */
static struct loaded_domain *the_domain;


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


DWORD
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;
}


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) != (size_t)st.st_size
        || size < sizeof (struct mo_file_header) ) {
        fclose( fp );   
        return NULL;
    }

    data = (struct mo_file_header *) xcalloc (1, size);
    if( !data ) {
        fclose( fp );
        return NULL; /* out of memory */
    }

    to_read = size;
    read_ptr = (char *) data;
    do {
        size_t 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 *)xcalloc( 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 = (DWORD *)  
              ((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 *)xcalloc( 1, domain->nstrings );
    if( !domain->mapped ) {
        free( data );
        free( domain ); 
        return NULL;
    }

    return domain;
} /* load_domain */


static const char*
get_string( struct loaded_domain *domain, DWORD 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;
}


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.  */           
        DWORD len = strlen (msgid);     
        DWORD hash_val = hash_string (msgid);   
        DWORD idx = hash_val % domain->hash_size;       
        DWORD incr = 1 + (hash_val % (domain->hash_size - 2));  
        DWORD 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;
}


/* Set the file used for translations. Pass a NULL to disable translation.
   A new filename may be set at anytime. */
int
set_gettext_file (const char *filename)
{
    struct loaded_domain *domain = NULL;

    if (!filename)
        return 0;

    domain = load_domain (filename);
    if (the_domain) {
        free (the_domain->data);
        free (the_domain->mapped);
        free (the_domain);      
        the_domain = NULL;
    }
    the_domain = domain;
    return 0;
}


int
read_gettext_entry (char *path, DWORD pathlen)
{
    HKEY hkey;
    LONG err;
    DWORD type = 0;
    
    err = RegOpenKeyEx (HKEY_CURRENT_USER, "Control Panel\\MingW32\\NLS", 0,
                        KEY_READ, &hkey);
    if (err != ERROR_SUCCESS)
        return -1;
    err = RegQueryValueEx (hkey, "MODir", NULL, &type, (BYTE*)path, &pathlen);
    RegCloseKey (hkey);
    if (err != ERROR_SUCCESS)
        return -1;
    return 0;
}


int
setup_gettext (void)
{
    struct stat st;
    char modir[MAX_PATH+1+32];

    memset (modir, 0, sizeof (modir));
    if (read_gettext_entry (modir, MAX_PATH-1))
        return -1;
    strcat (modir, "\\gpgoe.mo");
    if (stat (modir, &st))
        return -1;
    set_gettext_file (modir);
    return 0;
}
1	twoaday	12	/* wptNLS.c - W32 Native Language Support
2			* Copyright (C) 2001, 2002, 2003, 2006 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			* This is free software; you can redistribute it and/or
9			* modify it under the terms of the GNU Lesser 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			* This software 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
19			#ifdef HAVE_CONFIG_H
20			#include <config.h>
21			#endif
22
23			#include <stdio.h>
24			#include <string.h>
25			#include <sys/stat.h>
26			#include <windows.h>
27
28			#include "gpgme.h"
29			#include "GPGOE.h"
30
31
32			/* The magic number of the GNU message catalog format. */
33			#define MAGIC 0x950412de
34			#define MAGIC_SWAPPED 0xde120495
35
36			/* Revision number of the currently used .mo (binary) file format. */
37			#define MO_REVISION_NUMBER 0
38
39			#define SWAPIT(flag, data) ((flag) ? do_swap_u32(data) : (data) )
40
41
42			/* We assume to have `unsigned long int' value with at least 32 bits. */
43			#define HASHWORDBITS 32
44
45			/* The so called `hashpjw' function by P.J. Weinberger
46			[see Aho/Sethi/Ullman, COMPILERS: Principles, Techniques and Tools,
47			1986, 1987 Bell Telephone Laboratories, Inc.] */
48
49			/* Header for binary .mo file format. */
50			struct mo_file_header {
51			DWORD magic; /* The magic number. */
52			DWORD revision; /* The revision number of the file format. */
53			DWORD nstrings; /* The number of strings pairs. */
54			DWORD orig_tab_offset; /* Offset of table with start offsets of original
55			strings. */
56			DWORD trans_tab_offset; /* Offset of table with start offsets of translation
57			strings. */
58			DWORD hash_tab_size; /* Size of hashing table. */
59			DWORD hash_tab_offset; /* Offset of first hashing entry. */
60			};
61
62			struct string_desc {
63			DWORD length; /* Length of addressed string. */
64			DWORD offset; /* Offset of string in file. */
65			};
66
67			struct loaded_domain {
68			char *data;
69			int must_swap;
70			DWORD nstrings;
71			char *mapped;
72			struct string_desc *orig_tab;
73			struct string_desc *trans_tab;
74			DWORD hash_size;
75			DWORD *hash_tab;
76			};
77
78
79			/* The current domain. */
80			static struct loaded_domain *the_domain;
81
82
83			static DWORD
84			do_swap_u32 (DWORD i)
85			{
86			return (i << 24) \| ((i & 0xff00) << 8) \| ((i >> 8) & 0xff00) \| (i >> 24);
87			}
88
89
90	twoaday	19	DWORD
91	twoaday	12	hash_string (const char *str_param)
92			{
93			unsigned long int hval, g;
94			const char *str = str_param;
95
96			hval = 0;
97			while (*str != '\0') {
98			hval <<= 4;
99			hval += (unsigned long int) *str++;
100			g = hval & ((unsigned long int) 0xf << (HASHWORDBITS - 4));
101			if (g != 0) {
102			hval ^= g >> (HASHWORDBITS - 8);
103			hval ^= g;
104			}
105			}
106			return hval;
107			}
108
109
110			static struct loaded_domain *
111			load_domain( const char *filename )
112			{
113			FILE *fp;
114			size_t size;
115			struct stat st;
116			struct mo_file_header *data = NULL;
117			struct loaded_domain *domain = NULL;
118			size_t to_read;
119			char *read_ptr;
120
121			fp = fopen( filename, "rb" );
122			if( !fp )
123			return NULL; /* can't open the file */
124			/* we must know about the size of the file */
125			if( fstat( fileno(fp ), &st )
126			\|\| (size = (size_t)st.st_size) != (size_t)st.st_size
127			\|\| size < sizeof (struct mo_file_header) ) {
128			fclose( fp );
129			return NULL;
130			}
131
132			data = (struct mo_file_header *) xcalloc (1, size);
133			if( !data ) {
134			fclose( fp );
135			return NULL; /* out of memory */
136			}
137
138			to_read = size;
139			read_ptr = (char *) data;
140			do {
141			size_t nb = fread( read_ptr, 1, to_read, fp );
142			if( nb < to_read ) {
143			fclose (fp);
144			free(data);
145			return NULL; /* read error */
146
147			}
148			read_ptr += nb;
149			to_read -= nb;
150			} while( to_read > 0 );
151			fclose (fp);
152
153			/* Using the magic number we can test whether it really is a message
154			* catalog file. */
155			if( data->magic != MAGIC && data->magic != MAGIC_SWAPPED ) {
156			/* The magic number is wrong: not a message catalog file. */
157			free( data );
158			return NULL;
159			}
160
161			domain = (struct loaded_domain )xcalloc( 1, sizeof domain );
162			if( !domain ) {
163			free( data );
164			return NULL;
165			}
166			domain->data = (char *) data;
167			domain->must_swap = data->magic != MAGIC;
168
169			/* Fill in the information about the available tables. */
170			switch( SWAPIT(domain->must_swap, data->revision) ) {
171			case 0:
172			domain->nstrings = SWAPIT(domain->must_swap, data->nstrings);
173			domain->orig_tab = (struct string_desc *)
174			((char *) data + SWAPIT(domain->must_swap, data->orig_tab_offset));
175			domain->trans_tab = (struct string_desc *)
176			((char *) data + SWAPIT(domain->must_swap, data->trans_tab_offset));
177			domain->hash_size = SWAPIT(domain->must_swap, data->hash_tab_size);
178			domain->hash_tab = (DWORD *)
179			((char *) data + SWAPIT(domain->must_swap, data->hash_tab_offset));
180			break;
181
182			default: /* This is an invalid revision. */
183			free( data );
184			free( domain );
185			return NULL;
186			}
187
188			/* allocate an array to keep track of code page mappings */
189			domain->mapped = (char *)xcalloc( 1, domain->nstrings );
190			if( !domain->mapped ) {
191			free( data );
192			free( domain );
193			return NULL;
194			}
195
196			return domain;
197			} /* load_domain */
198
199
200			static const char*
201			get_string( struct loaded_domain *domain, DWORD idx )
202			{
203			char *p = domain->data + SWAPIT(domain->must_swap,
204			domain->trans_tab[idx].offset);
205			if( !domain->mapped[idx] ) {
206			domain->mapped[idx] = 1;
207			}
208			return (const char*)p;
209			}
210
211
212			const char *
213			gettext( const char *msgid )
214			{
215			struct loaded_domain *domain;
216			size_t act = 0;
217			size_t top, bottom;
218
219			if( !(domain = the_domain) )
220			goto not_found;
221
222			/* Locate the MSGID and its translation. */
223			if( domain->hash_size > 2 && domain->hash_tab ) {
224			/* Use the hashing table. */
225			DWORD len = strlen (msgid);
226			DWORD hash_val = hash_string (msgid);
227			DWORD idx = hash_val % domain->hash_size;
228			DWORD incr = 1 + (hash_val % (domain->hash_size - 2));
229			DWORD nstr = SWAPIT (domain->must_swap, domain->hash_tab[idx]);
230
231			if ( !nstr ) /* Hash table entry is empty. */
232			goto not_found;
233
234
235			if( SWAPIT(domain->must_swap,
236			domain->orig_tab[nstr - 1].length) == len
237			&& !strcmp( msgid,
238			domain->data + SWAPIT(domain->must_swap,
239			domain->orig_tab[nstr - 1].offset)) )
240			return get_string( domain, nstr - 1 );
241			for(;;) {
242			if (idx >= domain->hash_size - incr)
243			idx -= domain->hash_size - incr;
244			else
245			idx += incr;
246			nstr = SWAPIT(domain->must_swap, domain->hash_tab[idx]);
247			if( !nstr )
248			goto not_found; /* Hash table entry is empty. */
249
250			if ( SWAPIT(domain->must_swap,
251			domain->orig_tab[nstr - 1].length) == len
252			&& !strcmp (msgid,
253			domain->data + SWAPIT(domain->must_swap,
254			domain->orig_tab[nstr - 1].offset)))
255
256			return get_string( domain, nstr-1 );
257			} /* NOTREACHED */
258			}
259
260			/* Now we try the default method: binary search in the sorted
261			array of messages. */
262			bottom = 0;
263			top = domain->nstrings;
264			while( bottom < top ) {
265			int cmp_val;
266
267			act = (bottom + top) / 2;
268			cmp_val = strcmp(msgid, domain->data + SWAPIT(domain->must_swap,
269			domain->orig_tab[act].offset));
270			if (cmp_val < 0)
271			top = act;
272			else if (cmp_val > 0)
273			bottom = act + 1;
274			else
275			return get_string( domain, act );
276			}
277
278			not_found:
279			return msgid;
280			}
281
282
283			/* Set the file used for translations. Pass a NULL to disable translation.
284			A new filename may be set at anytime. */
285			int
286			set_gettext_file (const char *filename)
287			{
288			struct loaded_domain *domain = NULL;
289
290			if (!filename)
291			return 0;
292
293			domain = load_domain (filename);
294			if (the_domain) {
295			free (the_domain->data);
296			free (the_domain->mapped);
297			free (the_domain);
298			the_domain = NULL;
299			}
300			the_domain = domain;
301			return 0;
302			}
303
304
305			int
306			read_gettext_entry (char *path, DWORD pathlen)
307			{
308			HKEY hkey;
309			LONG err;
310			DWORD type = 0;
311
312			err = RegOpenKeyEx (HKEY_CURRENT_USER, "Control Panel\\MingW32\\NLS", 0,
313			KEY_READ, &hkey);
314			if (err != ERROR_SUCCESS)
315			return -1;
316			err = RegQueryValueEx (hkey, "MODir", NULL, &type, (BYTE*)path, &pathlen);
317			RegCloseKey (hkey);
318			if (err != ERROR_SUCCESS)
319			return -1;
320			return 0;
321			}
322
323
324			int
325			setup_gettext (void)
326			{
327			struct stat st;
328			char modir[MAX_PATH+1+32];
329
330			memset (modir, 0, sizeof (modir));
331			if (read_gettext_entry (modir, MAX_PATH-1))
332			return -1;
333			strcat (modir, "\\gpgoe.mo");
334			if (stat (modir, &st))
335			return -1;
336			set_gettext_file (modir);
337			return 0;
338			}