static INLINE bool_t
SI_window(FSFileHandle *self, FileWindow *window, int64_t offset, int64_t len)
{
// Release the previously mmap'd region, if any.
FSFH_release_window(self, window);
{
// Start map on a page boundary. Ensure that the window is at
// least wide enough to view all the data spec'd in the original
// request.
const int64_t remainder = offset % self->page_size;
const int64_t adjusted_offset = offset - remainder;
const int64_t adjusted_len = len + remainder;
char *const buf
= (char*)SI_map(self, adjusted_offset, adjusted_len);
if (len && buf == NULL) {
return false;
}
else {
FileWindow_Set_Window(window, buf, adjusted_offset,
adjusted_len);
}
}
return true;
}
FSFileHandle*
FSFH_do_open(FSFileHandle *self, const CharBuf *path, uint32_t flags) {
FH_do_open((FileHandle*)self, path, flags);
if (!path || !CB_Get_Size(path)) {
Err_set_error(Err_new(CB_newf("Missing required param 'path'")));
CFISH_DECREF(self);
return NULL;
}
// Attempt to open file.
if (flags & FH_WRITE_ONLY) {
self->fd = open((char*)CB_Get_Ptr8(path), SI_posix_flags(flags), 0666);
if (self->fd == -1) {
self->fd = 0;
Err_set_error(Err_new(CB_newf("Attempt to open '%o' failed: %s",
path, strerror(errno))));
CFISH_DECREF(self);
return NULL;
}
if (flags & FH_EXCLUSIVE) {
self->len = 0;
}
else {
// Derive length.
self->len = lseek64(self->fd, I64_C(0), SEEK_END);
if (self->len == -1) {
Err_set_error(Err_new(CB_newf("lseek64 on %o failed: %s",
self->path, strerror(errno))));
CFISH_DECREF(self);
return NULL;
}
else {
int64_t check_val = lseek64(self->fd, I64_C(0), SEEK_SET);
if (check_val == -1) {
Err_set_error(Err_new(CB_newf("lseek64 on %o failed: %s",
self->path, strerror(errno))));
CFISH_DECREF(self);
return NULL;
}
}
}
}
else if (flags & FH_READ_ONLY) {
if (SI_init_read_only(self)) {
// On 64-bit systems, map the whole file up-front.
if (IS_64_BIT && self->len) {
self->buf = (char*)SI_map(self, 0, self->len);
if (!self->buf) {
// An error occurred during SI_map, which has set
// Err_error for us already.
CFISH_DECREF(self);
return NULL;
}
}
}
else {
CFISH_DECREF(self);
return NULL;
}
}
else {
Err_set_error(Err_new(CB_newf("Must specify FH_READ_ONLY or FH_WRITE_ONLY to open '%o'",
path)));
CFISH_DECREF(self);
return NULL;
}
return self;
}
