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vvfat: correctly create long names for non-ASCII filenames

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Assume that input filename is encoded as UTF-8, so correctly create UTF-16 encoding.

Signed-off-by: Hervé Poussineau <hpoussin@reactos.org>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Hervé Poussineau 2017-05-22 23:12:00 +02:00 • committed by Kevin Wolf
parent f82d92bb02
commit 09ec4119fb
1 changed files with 19 additions and 21 deletions
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40
block/vvfat.c
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@ -424,28 +424,19 @@ static void init_mbr(BDRVVVFATState *s, int cyls, int heads, int secs)
/* direntry functions */ /* direntry functions */
/* dest is assumed to hold 258 bytes, and pads with 0xffff up to next multiple of 26 */ static direntry_t *create_long_filename(BDRVVVFATState *s, const char *filename)
static inline int short2long_name(char* dest,const char* src)
{ {
int i; int number_of_entries, i;
int len; glong length;
for(i=0;i<129 && src[i];i++) { direntry_t *entry;
dest[2*i]=src[i];
dest[2*i+1]=0;
}
len=2*i;
dest[2*i]=dest[2*i+1]=0;
for(i=2*i+2;(i%26);i++)
dest[i]=0xff;
return len;
}
static inline direntry_t* create_long_filename(BDRVVVFATState* s,const char* filename) gunichar2 *longname = g_utf8_to_utf16(filename, -1, NULL, &length, NULL);
{ if (!longname) {
char buffer[258]; fprintf(stderr, "vvfat: invalid UTF-8 name: %s\n", filename);
int length=short2long_name(buffer,filename), return NULL;
number_of_entries=(length+25)/26,i; }
direntry_t* entry;
number_of_entries = (length * 2 + 25) / 26;
for(i=0;i<number_of_entries;i++) { for(i=0;i<number_of_entries;i++) {
entry=array_get_next(&(s->directory)); entry=array_get_next(&(s->directory));
@ -460,8 +451,15 @@ static inline direntry_t* create_long_filename(BDRVVVFATState* s,const char* fil
else if(offset<22) offset=14+offset-10; else if(offset<22) offset=14+offset-10;
else offset=28+offset-22; else offset=28+offset-22;
entry=array_get(&(s->directory),s->directory.next-1-(i/26)); entry=array_get(&(s->directory),s->directory.next-1-(i/26));
entry->name[offset]=buffer[i]; if (i >= 2 * length + 2) {
entry->name[offset] = 0xff;
} else if (i % 2 == 0) {
entry->name[offset] = longname[i / 2] & 0xff;
} else {
entry->name[offset] = longname[i / 2] >> 8;
}
} }
g_free(longname);
return array_get(&(s->directory),s->directory.next-number_of_entries); return array_get(&(s->directory),s->directory.next-number_of_entries);
} }