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/*
* $Id: mangle.c,v 1.11 2002/10/05 20:13:31 jmarcus Exp $
*
* Copyright (c) 2002. Joe Marcus Clarke (marcus@marcuscom.com)
* All Rights Reserved. See COPYRIGHT.
*
* mangle, demangle (filename):
* mangle or demangle filenames if they are greater than the max allowed
* characters for a given version of AFP.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
#ifdef FILE_MANGLING
#include "mangle.h"
char *
demangle(const struct vol *vol, char *mfilename) {
char *filename = NULL;
char *ext = NULL;
int ext_len = 0;
char *mangle;
/* Is this really a mangled file? */
mangle = strstr(mfilename, MANGLE_CHAR);
if (!mangle) {
return mfilename;
}
if ((ext = strrchr(mfilename, '.')) != NULL) {
ext_len = strlen(ext);
}
if (strlen(mangle) != strlen(MANGLE_CHAR) + MANGLE_LENGTH + ext_len) {
LOG(log_error, logtype_afpd, "demangle: %s is not long enough to be a mangled filename", mfilename);
return mfilename;
}
filename = cnid_mangle_get(vol->v_db, mfilename);
/* No unmangled filename was found. */
if (filename == NULL) {
LOG(log_error, logtype_afpd, "demangle: Unable to lookup %s in the mangle database", mfilename);
return mfilename;
}
return filename;
}
char *
mangle(const struct vol *vol, char *filename) {
char *ext = NULL;
char *tf = NULL;
char *m = NULL;
static char mfilename[MAX_LENGTH + 1];
char mangle_suffix[MANGLE_LENGTH + 1];
int ext_len = 0;
int mangle_suffix_int = 0;
/* Do we really need to mangle this filename? */
if (strlen(filename) <= MAX_LENGTH) {
return filename;
}
/* First, attmept to locate a file extension. */
if ((ext = strrchr(filename, '.')) != NULL) {
ext_len = strlen(ext);
if (ext_len > MAX_EXT_LENGTH) {
/* Do some bounds checking to prevent an extension overflow. */
ext_len = MAX_EXT_LENGTH;
}
}
/* Check to see if we already have a mangled filename by this name. */
while (1) {
m = mfilename;
strncpy(m, filename, MAX_LENGTH - strlen(MANGLE_CHAR) - MANGLE_LENGTH - ext_len);
m[MAX_LENGTH - strlen(MANGLE_CHAR) - MANGLE_LENGTH - ext_len] = '\0';
strcat(m, MANGLE_CHAR);
(void)sprintf(mangle_suffix, "%03d", mangle_suffix_int);
strcat(m, mangle_suffix);
if (ext) {
strncat(m, ext, ext_len);
}
tf = cnid_mangle_get(vol->v_db, m);
if (tf == NULL || (strcmp(tf, filename)) == 0) {
break;
}
else {
if (++mangle_suffix_int > MAX_MANGLE_SUFFIX_LENGTH) {
LOG(log_error, logtype_afpd, "mangle: Failed to find a free mangle suffix; returning original filename");
return filename;
}
}
}
if (cnid_mangle_add(vol->v_db, m, filename) < 0) {
return filename;
}
return m;
}
#endif /* FILE_MANGLING */
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