Struct xpcom::interfaces::nsIBackgroundFileSaver

#[repr(C)]
pub struct nsIBackgroundFileSaver { /* fields omitted */ }

interface nsIBackgroundFileSaver : nsISupports

/**
 * Allows saving data to a file, while handling all the input/output on a
 * background thread, including the initial file name assignment and any
 * subsequent renaming of the target file.
 *
 * This interface is designed for file downloads.  Generally, they start in the
 * temporary directory, while the user is selecting the final name.  Then, they
 * are moved to the chosen target directory with a ".part" extension appended to
 * the file name.  Finally, they are renamed when the download is completed.
 *
 * Components implementing both nsIBackgroundFileSaver and nsIStreamListener
 * allow data to be fed using an implementation of OnDataAvailable that never
 * blocks the calling thread.  They suspend the request that drives the stream
 * listener in case too much data is being fed, and resume it when the data has
 * been written.  Calling OnStopRequest does not necessarily close the target
 * file, and the Finish method must be called to complete the operation.
 *
 * Components implementing both nsIBackgroundFileSaver and nsIAsyncOutputStream
 * allow data to be fed directly to the non-blocking output stream, that however
 * may return NS_BASE_STREAM_WOULD_BLOCK in case too much data is being fed.
 * Closing the output stream does not necessarily close the target file, and the
 * Finish method must be called to complete the operation.
 *
 * @remarks Implementations may require the consumer to always call Finish.  If
 *          the object reference is released without calling Finish, a memory
 *          leak may occur, and the target file might be kept locked. All
 *          public methods of the interface may only be called from the main
 *          thread.
 */

Methods

impl nsIBackgroundFileSaver

pub fn coerce<T: nsIBackgroundFileSaverCoerce>(&self) -> &T

Cast this nsIBackgroundFileSaver to one of its base interfaces.

impl nsIBackgroundFileSaver

pub unsafe fn GetObserver(
    &self,
    aObserver: *mut *const nsIBackgroundFileSaverObserver
) -> nsresult

/**
   * This observer receives notifications when the target file name changes and
   * when the operation completes, successfully or not.
   *
   * @remarks A strong reference to the observer is held.  Notification events
   *          are dispatched to the thread that created the object that
   *          implements nsIBackgroundFileSaver.
   */

attribute nsIBackgroundFileSaverObserver observer;

pub unsafe fn SetObserver(
    &self,
    aObserver: *const nsIBackgroundFileSaverObserver
) -> nsresult

/**
   * This observer receives notifications when the target file name changes and
   * when the operation completes, successfully or not.
   *
   * @remarks A strong reference to the observer is held.  Notification events
   *          are dispatched to the thread that created the object that
   *          implements nsIBackgroundFileSaver.
   */

attribute nsIBackgroundFileSaverObserver observer;

pub unsafe fn GetSignatureInfo(
    &self,
    aSignatureInfo: *mut *const nsIArray
) -> nsresult

/**
   * An nsIArray of nsIX509CertList, representing a chain of X.509 signatures on
   * the downloaded file. Each list may belong to a different signer and contain
   * certificates all the way up to the root.
   *
   * @throws NS_ERROR_NOT_AVAILABLE
   *         In case this is called before the onSaveComplete method has been
   *         called to notify success, or enableSignatureInfo has not been
   *         called.
   */

readonly attribute nsIArray signatureInfo;

pub unsafe fn GetSha256Hash(&self, aSha256Hash: &mut nsACString) -> nsresult

/**
   * The SHA-256 hash, in raw bytes, associated with the data that was saved.
   *
   * In case the enableAppend method has been called, the hash computation
   * includes the contents of the existing file, if any.
   *
   * @throws NS_ERROR_NOT_AVAILABLE
   *         In case the enableSha256 method has not been called, or before the
   *         onSaveComplete method has been called to notify success.
   */

readonly attribute ACString sha256Hash;

pub unsafe fn EnableSignatureInfo(&self) -> nsresult

/**
   * Instructs the component to compute the signatureInfo of the target file,
   * and make it available in the signatureInfo property.
   *
   * @remarks This must be set on the main thread before the first call to
   *          setTarget.
   */

void enableSignatureInfo ();

pub unsafe fn EnableSha256(&self) -> nsresult

/**
   * Instructs the component to compute the SHA-256 hash of the target file, and
   * make it available in the sha256Hash property.
   *
   * @remarks This must be set on the main thread before the first call to
   *          setTarget.
   */

void enableSha256 ();

pub unsafe fn EnableAppend(&self) -> nsresult

/**
   * Instructs the component to append data to the initial target file, that
   * will be specified by the first call to the setTarget method, instead of
   * overwriting the file.
   *
   * If the initial target file does not exist, this method has no effect.
   *
   * @remarks This must be set on the main thread before the first call to
   *          setTarget.
   */

void enableAppend ();

pub unsafe fn SetTarget(
    &self,
    aTarget: *const nsIFile,
    aKeepPartial: bool
) -> nsresult

/**
   * Sets the name of the output file to be written.  The target can be changed
   * after data has already been fed, in which case the existing file will be
   * moved to the new destination.
   *
   * In case the specified file already exists, and this method is called for
   * the first time, the file may be either overwritten or appended to, based on
   * whether the enableAppend method was called.  Subsequent calls always
   * overwrite the specified target file with the previously saved data.
   *
   * No file will be written until this function is called at least once.  It's
   * recommended not to feed any data until the output file is set.
   *
   * If an input/output error occurs with the specified file, the save operation
   * fails.  Failure is notified asynchronously through the observer.
   *
   * @param aTarget
   *        New output file to be written.
   * @param aKeepPartial
   *        Indicates whether aFile should be kept as partially completed,
   *        rather than deleted, if the operation fails or is canceled.  This is
   *        generally set for downloads that use temporary ".part" files.
   */

void setTarget (in nsIFile aTarget, in bool aKeepPartial);

pub unsafe fn Finish(&self, aStatus: nsresult) -> nsresult

/**
   * Terminates access to the output file, then notifies the observer with the
   * specified status code.  A failure code will force the operation to be
   * canceled, in which case the output file will be deleted if requested.
   *
   * This forces the involved streams to be closed, thus no more data should be
   * fed to the component after this method has been called.
   *
   * This is the last method that should be called on this object, and the
   * target file name cannot be changed anymore after this method has been
   * called.  Conversely, before calling this method, the file can still be
   * renamed even if all the data has been fed.
   *
   * @param aStatus
   *        Result code that determines whether the operation should succeed or
   *        be canceled, and is notified to the observer.  If the operation
   *        fails meanwhile for other reasons, or the observer has been already
   *        notified of completion, this status code is ignored.
   */

void finish (in nsresult aStatus);

Methods from Deref<Target = nsISupports>

pub fn coerce<T: nsISupportsCoerce>(&self) -> &T

Cast this nsISupports to one of its base interfaces.

pub unsafe fn QueryInterface(
    &self,
    uuid: &nsIID,
    result: *mut *mut c_void
) -> nsresult

void QueryInterface (in nsIIDRef uuid, [iid_is (uuid), retval] out nsQIResult result);

pub unsafe fn AddRef(&self) -> nsrefcnt

[noscript,notxpcom] nsrefcnt AddRef ();

pub unsafe fn Release(&self) -> nsrefcnt

[noscript,notxpcom] nsrefcnt Release ();

Trait Implementations

impl XpCom for nsIBackgroundFileSaver

const IID: nsIID

IID: nsIID = nsID(3291825316, 26668, 16994, [180, 7, 36, 83, 210, 110, 102, 13])

fn query_interface<T: XpCom>(&self) -> Option<RefPtr<T>>

Perform a QueryInterface call on this object, attempting to dynamically cast it to the requested interface type. Returns Some(RefPtr) if the cast succeeded, and None otherwise.

impl RefCounted for nsIBackgroundFileSaver

unsafe fn addref(&self)

Increment the reference count.

unsafe fn release(&self)

Decrement the reference count, potentially freeing backing memory.

impl Deref for nsIBackgroundFileSaver

type Target = nsISupports

The resulting type after dereferencing.

fn deref(&self) -> &nsISupports

Dereferences the value.