2 * $Id: mangle.c,v 1.16.2.1.2.8 2004-02-14 15:47:20 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];
32 /* We need to check, whether we really need to demangle the filename */
33 /* i.e. it's not just a file with a valid #HEX in the name ... */
34 /* but we don't want to miss valid demangle as well. */
36 /* check whether file extensions match */
37 if ( NULL != (u = strchr(uname, '.')) ) {
41 else if ( *ext == '.' )
44 /* First we convert the unix name to our volume maccharset */
45 /* This assumes, OSX will not send us a mangled name for *any* */
46 /* other reason than a hint/filename mismatch on the OSX side!! */
47 /* If the filename needed mangling, we'll get the mac filename */
48 /* till the first unconvertable char, so these have to match */
49 /* the mangled name we got .. */
51 flags = CONV_IGNORE | CONV_UNESCAPEHEX;
52 if ( (size_t) -1 == (len = convert_charset(vol->v_volcharset, vol->v_maccharset, 0,
53 uname, strlen(uname), buffer, MAXPATHLEN, &flags)) ) {
56 /* If the filename is too long we also needed to mangle isn't this stuff always false */
57 if ( len >= vol->max_filename ) {
58 flags |= CONV_REQMANGLE;
62 /* Ok, mangling was needed, now we do some further checks */
63 /* this is still necessary, as we might have a file abcde:xx */
64 /* with id 12, mangled to abcde#12, and a passed filename */
66 /* if we only checked if "prefix" number of characters match */
67 /* we get a false postive in above case */
69 if ( flags & CONV_REQMANGLE ) {
71 /* convert the buffer to UTF8_MAC ... */
72 if ((size_t) -1 == (len = convert_charset(vol->v_maccharset, CH_UTF8_MAC, 0,
73 buffer, len, buffer, MAXPATHLEN, &flags)) ) {
76 /* Now compare the two names, they have to match the number of characters in buffer */
77 /* prefix can be longer than len, OSX might send us the first character(s) of a */
78 /* decomposed char as the *last* character(s) before the #, so our match below will */
79 /* still work, but leaves room for a race ... FIXME */
80 if ( prefix >= len && !strncmp (mfilename, buffer, len)) {
85 /* We couldn't convert the name to maccharset at all, so we'd expect a name */
86 /* in the "???#ID" form ... */
87 if ( !strncmp("???", mfilename, prefix)) {
90 /* ..but OSX might send us only the first characters of a decomposed character. */
91 /* So convert to UTF8_MAC again, now at least the prefix number of */
92 /* characters have to match ... again a possible race FIXME */
94 if ( (size_t) -1 == (len = convert_charset(vol->v_volcharset, CH_UTF8_MAC, 0,
95 uname, strlen(uname), buffer, MAXPATHLEN, &flags)) ) {
99 if ( !strncmp (mfilename, buffer, prefix) ) {
107 /* -------------------------------------------------------
110 private_demangle(const struct vol *vol, char *mfilename, cnid_t did, cnid_t *osx)
114 u_int32_t id, file_id;
115 static char buffer[12 + MAXPATHLEN + 1];
116 int len = 12 + MAXPATHLEN + 1;
122 t = strchr(mfilename, MANGLE_CHAR);
126 prefix = t - mfilename;
128 * is prefix == 0 a valid mangled filename ?
130 /* may be a mangled filename */
132 if (*t == '0') { /* can't start with a 0 */
135 while(isuxdigit(*t)) {
136 id = (id *16) + hextoint(*t);
139 if ((*t != 0 && *t != '.') || strlen(t) > MAX_EXT_LENGTH || id < 17) {
143 file_id = id = htonl(id);
148 /* is it a dir?, there's a conflict with pre OSX 'trash #2' */
149 if ((dir = dirsearch(vol, id))) {
150 if (dir->d_did != id) {
151 /* not in the same folder, there's a race with outdate cache
152 * but we have to live with it, hopefully client will recover
157 /* it's not from cname so mfilename and dir must be the same */
158 if (!strcmp(dir->d_m_name, mfilename)) {
159 return dir->d_u_name;
163 return demangle_checks (vol, dir->d_u_name, mfilename, prefix, t);
166 else if (NULL != (u_name = cnid_resolve(vol->v_cdb, &id, buffer, len)) ) {
171 /* convert back to mac name and check it's the same */
172 t = utompath(vol, u_name, file_id, utf8_encoding());
173 if (!strcmp(t, mfilename)) {
178 return demangle_checks (vol, u_name, mfilename, prefix, t);
185 /* -------------------------------------------------------
188 demangle(const struct vol *vol, char *mfilename, cnid_t did)
190 return private_demangle(vol, mfilename, did, NULL);
193 /* -------------------------------------------------------
197 demangle_osx(const struct vol *vol, char *mfilename, cnid_t did, cnid_t *fileid)
199 return private_demangle(vol, mfilename, did, fileid);
202 /* -----------------------
203 with utf8 filename not always round trip
204 filename mac filename too long or first chars if unmatchable chars.
206 id file/folder ID or 0
210 mangle(const struct vol *vol, char *filename, char *uname, cnid_t id, int flags) {
213 static char mfilename[MAX_LENGTH + 1];
214 char mangle_suffix[MANGLE_LENGTH + 1];
218 /* Do we really need to mangle this filename? */
219 if (!flags && strlen(filename) <= vol->max_filename) {
222 /* First, attempt to locate a file extension. */
223 if (NULL != (ext = strrchr(uname, '.')) ) {
224 ext_len = strlen(ext);
225 if (ext_len > MAX_EXT_LENGTH) {
226 /* Do some bounds checking to prevent an extension overflow. */
227 ext_len = MAX_EXT_LENGTH;
231 k = sprintf(mangle_suffix, "%c%X", MANGLE_CHAR, ntohl(id));
233 strlcpy(m, filename, MAX_LENGTH - k - ext_len +1);
237 strcat(m, mangle_suffix);
239 strncat(m, ext, ext_len);