/** readv against a gridfs file
* timeout_msec is unused */
ssize_t
mongoc_gridfs_file_readv (mongoc_gridfs_file_t *file,
mongoc_iovec_t *iov,
size_t iovcnt,
size_t min_bytes,
uint32_t timeout_msec)
{
uint32_t bytes_read = 0;
int32_t r;
size_t i;
uint32_t iov_pos;
ENTRY;
BSON_ASSERT (file);
BSON_ASSERT (iov);
BSON_ASSERT (iovcnt);
/* Reading when positioned past the end does nothing */
if (file->pos >= file->length) {
return 0;
}
/* Try to get the current chunk */
if (!file->page && !_mongoc_gridfs_file_refresh_page (file)) {
return -1;
}
for (i = 0; i < iovcnt; i++) {
iov_pos = 0;
for (;;) {
r = _mongoc_gridfs_file_page_read (
file->page,
(uint8_t *) iov[i].iov_base + iov_pos,
(uint32_t) (iov[i].iov_len - iov_pos));
BSON_ASSERT (r >= 0);
iov_pos += r;
file->pos += r;
bytes_read += r;
if (iov_pos == iov[i].iov_len) {
/* filled a bucket, keep going */
break;
} else if (file->length == file->pos) {
/* we're at the end of the file. So we're done */
RETURN (bytes_read);
} else if (bytes_read >= min_bytes) {
/* we need a new page, but we've read enough bytes to stop */
RETURN (bytes_read);
} else if (!_mongoc_gridfs_file_refresh_page (file)) {
return -1;
}
}
}
RETURN (bytes_read);
}
/** readv against a gridfs file */
ssize_t
mongoc_gridfs_file_readv (mongoc_gridfs_file_t *file,
mongoc_iovec_t *iov,
size_t iovcnt,
size_t min_bytes,
uint32_t timeout_msec)
{
uint32_t bytes_read = 0;
int32_t r;
size_t i;
uint32_t iov_pos;
ENTRY;
BSON_ASSERT (file);
BSON_ASSERT (iov);
BSON_ASSERT (iovcnt);
BSON_ASSERT (timeout_msec <= INT_MAX);
/* TODO: we should probably do something about timeout_msec here */
if (!file->page) {
_mongoc_gridfs_file_refresh_page (file);
}
for (i = 0; i < iovcnt; i++) {
iov_pos = 0;
for (;; ) {
r = _mongoc_gridfs_file_page_read (file->page,
(uint8_t *)iov[i].iov_base + iov_pos,
(uint32_t)(iov[i].iov_len - iov_pos));
BSON_ASSERT (r >= 0);
iov_pos += r;
file->pos += r;
bytes_read += r;
if (iov_pos == iov[i].iov_len) {
/* filled a bucket, keep going */
break;
} else if (file->length == file->pos) {
/* we're at the end of the file. So we're done */
RETURN (bytes_read);
} else if (bytes_read >= min_bytes) {
/* we need a new page, but we've read enough bytes to stop */
RETURN (bytes_read);
} else {
/* more to read, just on a new page */
_mongoc_gridfs_file_refresh_page (file);
}
}
}
RETURN (bytes_read);
}
