/* If this returns NULL then an exception is pending */
WCHAR*
pathToNTPath(JNIEnv *env, jstring path, jboolean throwFNFE) {
int pathlen = 0;
WCHAR *pathbuf = NULL;
int max_path = 248; /* CreateDirectoryW() has the limit of 248 */
WITH_UNICODE_STRING(env, path, ps) {
pathlen = (int)wcslen(ps);
if (pathlen != 0) {
if (pathlen > 2 &&
(ps[0] == L'\\' && ps[1] == L'\\' || //UNC
ps[1] == L':' && ps[2] == L'\\')) //absolute
{
if (pathlen > max_path - 1) {
pathbuf = prefixAbpath(ps, pathlen, pathlen);
} else {
pathbuf = (WCHAR*)malloc((pathlen + 6) * sizeof(WCHAR));
if (pathbuf != 0) {
wcscpy(pathbuf, ps);
}
}
} else {
/* If the path came in as a relative path, need to verify if
its absolute form is bigger than max_path or not, if yes
need to (1)convert it to absolute and (2)prefix. This is
obviously a burden to all relative paths (The current dir/len
for "drive & directory" relative path is cached, so we only
calculate it once but for "drive-relative path we call
_wgetdcwd() and wcslen() everytime), but a hit we have
to take if we want to support relative path beyond max_path.
There is no way to predict how long the absolute path will be
(therefor allocate the sufficient memory block) before calling
_wfullpath(), we have to get the length of "current" dir first.
*/
WCHAR *abpath = NULL;
int dirlen = currentDirLength(ps, pathlen);
if (dirlen + pathlen + 1 > max_path - 1) {
pathbuf = prefixAbpath(ps, pathlen, dirlen + pathlen);
} else {
pathbuf = (WCHAR*)malloc((pathlen + 6) * sizeof(WCHAR));
if (pathbuf != 0) {
wcscpy(pathbuf, ps);
}
}
}
}
} END_UNICODE_STRING(env, ps);
WITH_UNICODE_STRING(env, pathname, path) {
/*we estimate the max length of memory needed as
"currentDir. length + pathname.length"
*/
int len = wcslen(path);
len += currentDirLength(path, len);
if (len > MAX_PATH_LENGTH - 1) {
WCHAR *cp = (WCHAR*)malloc(len * sizeof(WCHAR));
if (cp != NULL) {
if (wcanonicalize(path, cp, len) >= 0) {
rv = (*env)->NewString(env, cp, wcslen(cp));
}
free(cp);
}
} else
if (wcanonicalize(path, canonicalPath, MAX_PATH_LENGTH) >= 0) {
rv = (*env)->NewString(env, canonicalPath, wcslen(canonicalPath));
}
} END_UNICODE_STRING(env, path);
