/**
* @return The number of leaves or zero if unknown.
*/
size_t
tth_cache_lookup(const struct tth *tth, filesize_t filesize)
{
size_t expected, leave_count = 0;
g_return_val_if_fail(tth, 0);
expected = tt_good_node_count(filesize);
if (expected > 1) {
filestat_t sb;
char *pathname;
pathname = tth_cache_pathname(tth);
if (stat(pathname, &sb)) {
leave_count = 0;
if (ENOENT != errno) {
g_warning("%s(%s): stat(\"%s\") failed: %m",
G_STRFUNC, tth_base32(tth), pathname);
}
} else {
leave_count = tth_cache_leave_count(tth, &sb);
}
HFREE_NULL(pathname);
} else {
leave_count = 1;
}
return expected != leave_count ? 0 : leave_count;
}
static int
tth_cache_file_create(const struct tth *tth)
{
char *pathname;
int accmode;
int fd;
g_return_val_if_fail(tth, -1);
accmode = O_WRONLY | O_TRUNC;
pathname = tth_cache_pathname(tth);
/*
* Critical section required since we could have a concurrent thread
* deciding to remove empty directories whilst we are attempting
* to create a new directory to store the new cached entry!
*/
TTH_PATH_LOCK;
fd = file_create_missing(pathname, accmode, TTH_FILE_MODE);
if (fd < 0 && ENOENT == errno) {
char *dir = filepath_directory(pathname);
if (0 == create_directory(dir, DEFAULT_DIRECTORY_MODE)) {
fd = file_create(pathname, accmode, TTH_FILE_MODE);
}
HFREE_NULL(dir);
}
TTH_PATH_UNLOCK;
HFREE_NULL(pathname);
return fd;
}
void
tth_cache_remove(const struct tth *tth)
{
char *pathname;
g_return_if_fail(tth);
pathname = tth_cache_pathname(tth);
unlink(pathname);
HFREE_NULL(pathname);
}
static bool
tth_cache_file_exists(const struct tth *tth)
{
bool ret;
char *pathname;
g_return_val_if_fail(tth, FALSE);
pathname = tth_cache_pathname(tth);
ret = file_exists(pathname);
HFREE_NULL(pathname);
return ret;
}
static int
tth_cache_file_open(const struct tth *tth)
{
char *pathname;
int fd;
g_return_val_if_fail(tth, -1);
pathname = tth_cache_pathname(tth);
fd = file_open_missing(pathname, O_RDONLY);
HFREE_NULL(pathname);
return fd;
}
static int
tth_cache_file_create(const struct tth *tth)
{
char *pathname;
int accmode;
int fd;
g_return_val_if_fail(tth, -1);
accmode = O_WRONLY | O_TRUNC;
pathname = tth_cache_pathname(tth);
fd = file_create_missing(pathname, accmode, TTH_FILE_MODE);
if (fd < 0 && ENOENT == errno) {
char *dir = filepath_directory(pathname);
if (0 == create_directory(dir, DEFAULT_DIRECTORY_MODE)) {
fd = file_create(pathname, accmode, TTH_FILE_MODE);
}
HFREE_NULL(dir);
}
HFREE_NULL(pathname);
return fd;
}