2 * $Id: mangle.c,v 1.16.2.1.2.12.2.1 2005-01-31 19:50:37 didg Exp $
4 * Copyright (c) 2002. Joe Marcus Clarke (marcus@marcuscom.com)
5 * All Rights Reserved. See COPYRIGHT.
7 * mangle, demangle (filename):
8 * mangle or demangle filenames if they are greater than the max allowed
9 * characters for a given version of AFP.
14 #endif /* HAVE_CONFIG_H */
20 #include <atalk/util.h>
22 #define hextoint( c ) ( isdigit( c ) ? c - '0' : c + 10 - 'A' )
23 #define isuxdigit(x) (isdigit(x) || (isupper(x) && isxdigit(x)))
25 static char *demangle_checks ( const struct vol *vol, char* uname, char * mfilename, size_t prefix, char * ext)
28 static char buffer[MAXPATHLEN +1];
33 /* We need to check, whether we really need to demangle the filename */
34 /* i.e. it's not just a file with a valid #HEX in the name ... */
35 /* but we don't want to miss valid demangle as well. */
37 /* check whether file extensions match */
38 if ( NULL != (u = strchr(uname, '.')) ) {
42 else if ( *ext == '.' )
45 /* First we convert the unix name to our volume maccharset */
46 /* This assumes, OSX will not send us a mangled name for *any* */
47 /* other reason than a hint/filename mismatch on the OSX side!! */
48 /* If the filename needed mangling, we'll get the mac filename */
49 /* till the first unconvertable char, so these have to match */
50 /* the mangled name we got .. */
52 flags = CONV_IGNORE | CONV_UNESCAPEHEX;
53 if ( (size_t) -1 == (len = convert_charset(vol->v_volcharset, vol->v_maccharset, 0,
54 uname, strlen(uname), buffer, MAXPATHLEN, &flags)) ) {
57 /* If the filename is too long we also needed to mangle isn't this stuff always false */
58 if ( len >= vol->max_filename || (mfilenamelen = strlen(mfilename)) == MACFILELEN ) {
59 flags |= CONV_REQMANGLE;
63 /* Ok, mangling was needed, now we do some further checks */
64 /* this is still necessary, as we might have a file abcde:xx */
65 /* with id 12, mangled to abcde#12, and a passed filename */
67 /* if we only checked if "prefix" number of characters match */
68 /* we get a false postive in above case */
70 if ( flags & CONV_REQMANGLE ) {
72 /* convert the buffer to UTF8_MAC ... */
73 if ((size_t) -1 == (len = convert_charset(vol->v_maccharset, CH_UTF8_MAC, 0,
74 buffer, len, buffer, MAXPATHLEN, &flags)) ) {
77 /* Now compare the two names, they have to match the number of characters in buffer */
78 /* prefix can be longer than len, OSX might send us the first character(s) of a */
79 /* decomposed char as the *last* character(s) before the #, so our match below will */
80 /* still work, but leaves room for a race ... FIXME */
81 if ( (prefix >= len || mfilenamelen == MACFILELEN)
82 && !strncmp (mfilename, buffer, len)) {
87 /* We couldn't convert the name to maccharset at all, so we'd expect a name */
88 /* in the "???#ID" form ... */
89 if ( !strncmp("???", mfilename, prefix)) {
92 /* ..but OSX might send us only the first characters of a decomposed character. */
93 /* So convert to UTF8_MAC again, now at least the prefix number of */
94 /* characters have to match ... again a possible race FIXME */
96 if ( (size_t) -1 == (len = convert_charset(vol->v_volcharset, CH_UTF8_MAC, 0,
97 uname, strlen(uname), buffer, MAXPATHLEN, &flags)) ) {
101 if ( !strncmp (mfilename, buffer, prefix) ) {
109 /* -------------------------------------------------------
112 private_demangle(const struct vol *vol, char *mfilename, cnid_t did, cnid_t *osx)
116 u_int32_t id, file_id;
117 static char buffer[12 + MAXPATHLEN + 1];
118 int len = 12 + MAXPATHLEN + 1;
124 t = strchr(mfilename, MANGLE_CHAR);
128 prefix = t - mfilename;
130 * is prefix == 0 a valid mangled filename ?
132 /* may be a mangled filename */
134 if (*t == '0') { /* can't start with a 0 */
137 while(isuxdigit(*t)) {
138 id = (id *16) + hextoint(*t);
141 if ((*t != 0 && *t != '.') || strlen(t) > MAX_EXT_LENGTH || id < 17) {
145 file_id = id = htonl(id);
150 /* is it a dir?, there's a conflict with pre OSX 'trash #2' */
151 if ((dir = dirsearch(vol, id))) {
152 if (dir->d_parent && dir->d_parent->d_did != did) {
153 /* not in the same folder, there's a race with outdate cache
154 * but we have to live with it, hopefully client will recover
159 /* it's not from cname so mfilename and dir must be the same */
160 if (!strcmp(dir->d_m_name, mfilename)) {
161 return dir->d_u_name;
165 return demangle_checks (vol, dir->d_u_name, mfilename, prefix, t);
168 else if (NULL != (u_name = cnid_resolve(vol->v_cdb, &id, buffer, len)) ) {
173 /* convert back to mac name and check it's the same */
174 t = utompath(vol, u_name, file_id, utf8_encoding());
175 if (!strcmp(t, mfilename)) {
180 return demangle_checks (vol, u_name, mfilename, prefix, t);
187 /* -------------------------------------------------------
190 demangle(const struct vol *vol, char *mfilename, cnid_t did)
192 return private_demangle(vol, mfilename, did, NULL);
195 /* -------------------------------------------------------
199 demangle_osx(const struct vol *vol, char *mfilename, cnid_t did, cnid_t *fileid)
201 return private_demangle(vol, mfilename, did, fileid);
205 /* -------------------------------------------------------
206 * find the start of a utf8 character
208 static unsigned char *
209 utf8_mangle_validate(unsigned char *path, size_t len)
211 unsigned char *p = path + len;
214 /* char matches with 10xxxxxx ? */
215 while ( len && *p && ((*p & 0xc0) == 0x80)) {
226 /* -----------------------
227 with utf8 filename not always round trip
228 filename mac filename too long or first chars if unmatchable chars.
230 id file/folder ID or 0
234 mangle(const struct vol *vol, unsigned char *filename, size_t filenamelen, unsigned char *uname, cnid_t id, int flags) {
235 unsigned char *ext = NULL;
236 unsigned char *m = NULL;
237 static unsigned char mfilename[MAXPATHLEN + 1];
238 unsigned char mangle_suffix[MANGLE_LENGTH + 1];
243 maxlen = (flags & 2)?255:MACFILELEN; /* was vol->max_filename */
244 /* Do we really need to mangle this filename? */
245 if (!(flags & 1) && filenamelen <= maxlen) {
248 /* First, attempt to locate a file extension. */
249 if (NULL != (ext = strrchr(uname, '.')) ) {
250 ext_len = strlen(ext);
251 if (ext_len > MAX_EXT_LENGTH) {
252 /* Do some bounds checking to prevent an extension overflow. */
253 ext_len = MAX_EXT_LENGTH;
257 k = sprintf(mangle_suffix, "%c%X", MANGLE_CHAR, ntohl(id));
259 strlcpy(m, filename, maxlen - k - ext_len +1);
261 m = utf8_mangle_validate(m, maxlen - k - ext_len +1);
265 strcat(m, mangle_suffix);
267 strncat(m, ext, ext_len);