1 files changed, 238 insertions, 0 deletions
diff --git a/netwerk/base/nsIFileStreams.idl b/netwerk/base/nsIFileStreams.idl
new file mode 100644
index 0000000000..4b704493ea
--- /dev/null
+++ b/netwerk/base/nsIFileStreams.idl
@@ -0,0 +1,238 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsIInputStream.idl"
+#include "nsIOutputStream.idl"
+
+interface nsIEventTarget;
+interface nsIFile;
+interface nsIFileMetadataCallback;
+
+%{C++
+struct PRFileDesc;
+%}
+
+[ptr] native PRFileDescPtr(PRFileDesc);
+
+/**
+ * An input stream that allows you to read from a file.
+ */
+[scriptable, uuid(e3d56a20-c7ec-11d3-8cda-0060b0fc14a3)]
+interface nsIFileInputStream : nsIInputStream
+{
+    /**
+     * @param file          file to read from
+     * @param ioFlags       file open flags listed in prio.h (see
+     *                      PR_Open documentation) or -1 to open the
+     *                      file in default mode (PR_RDONLY).
+     * @param perm          file mode bits listed in prio.h or -1 to
+     *                      use the default value (0)
+     * @param behaviorFlags flags specifying various behaviors of the class
+     *        (see enumerations in the class)
+     */
+    void init(in nsIFile file, in long ioFlags, in long perm,
+              in long behaviorFlags);
+
+    /**
+     * If this is set, the file will close automatically when the end of the
+     * file is reached.
+     */
+    const long CLOSE_ON_EOF = 1<<2;
+
+    /**
+     * If this is set, the file will be reopened whenever we reach the start of
+     * the file, either by doing a Seek(0, NS_SEEK_CUR), or by doing a relative
+     * seek that happen to reach the beginning of the file. If the file is
+     * already open and the seek occurs, it will happen naturally.  (The file
+     * will only be reopened if it is closed for some reason.)
+     */
+    const long REOPEN_ON_REWIND = 1<<3;
+
+    /**
+     * If this is set, the file will be opened (i.e., a call to
+     * PR_Open done) only when we do an actual operation on the stream,
+     * or more specifically, when one of the following is called:
+     *   - Seek
+     *   - Tell
+     *   - SetEOF
+     *   - Available
+     *   - Read
+     *   - ReadLine
+     *
+     * DEFER_OPEN is useful if we use the stream on a background
+     * thread, so that the opening and possible |stat|ing of the file
+     * happens there as well.
+     *
+     * @note Using this flag results in the file not being opened
+     *       during the call to Init.  This means that any errors that might
+     *       happen when this flag is not set would happen during the
+     *       first read.  Also, the file is not locked when Init is called,
+     *       so it might be deleted before we try to read from it.
+     */
+    const long DEFER_OPEN = 1<<4;
+
+    /**
+     * This flag has no effect and is totally ignored on any platform except
+     * Windows since this is the default behavior on POSIX systems. On Windows
+     * if this flag is set then the stream is opened in a special mode that
+     * allows the OS to delete the file from disk just like POSIX.
+     */
+    const long SHARE_DELETE = 1<<5;
+};
+
+/**
+ * An output stream that lets you stream to a file.
+ */
+[scriptable, uuid(e734cac9-1295-4e6f-9684-3ac4e1f91063)]
+interface nsIFileOutputStream : nsIOutputStream
+{
+    /**
+     * @param file          file to write to
+     * @param ioFlags       file open flags listed in prio.h (see
+     *                      PR_Open documentation) or -1 to open the
+     *                      file in default mode (PR_WRONLY |
+     *                      PR_CREATE_FILE | PR_TRUNCATE)
+     * @param perm          file mode bits listed in prio.h or -1 to
+     *                      use the default permissions (0664)
+     * @param behaviorFlags flags specifying various behaviors of the class
+     *        (currently none supported)
+     */
+    void init(in nsIFile file, in long ioFlags, in long perm,
+              in long behaviorFlags);
+
+    /**
+     * @param length        asks the operating system to allocate storage for
+     *                      this file of at least |length| bytes long, and
+     *                      set the file length to the corresponding size.
+     * @throws NS_ERROR_FAILURE if the preallocation fails.
+     * @throws NS_ERROR_NOT_INITIALIZED if the file is not opened.
+     */
+    [noscript] void preallocate(in long long length);
+
+    /**
+     * See the same constant in nsIFileInputStream. The deferred open will
+     * be performed when one of the following is called:
+     *   - Seek
+     *   - Tell
+     *   - SetEOF
+     *   - Write
+     *   - Flush
+     *
+     * @note Using this flag results in the file not being opened
+     *       during the call to Init.  This means that any errors that might
+     *       happen when this flag is not set would happen during the
+     *       first write, and if the file is to be created, then it will not
+     *       appear on the disk until the first write.
+     */
+    const long DEFER_OPEN = 1<<0;
+};
+
+/**
+ * A stream that allows you to read from a file or stream to a file.
+ */
+[scriptable, uuid(82cf605a-8393-4550-83ab-43cd5578e006)]
+interface nsIFileStream : nsISupports
+{
+    /**
+     * @param file          file to read from or stream to
+     * @param ioFlags       file open flags listed in prio.h (see
+     *                      PR_Open documentation) or -1 to open the
+     *                      file in default mode (PR_RDWR).
+     * @param perm          file mode bits listed in prio.h or -1 to
+     *                      use the default value (0)
+     * @param behaviorFlags flags specifying various behaviors of the class
+     *        (see enumerations in the class)
+     */
+    void init(in nsIFile file, in long ioFlags, in long perm,
+              in long behaviorFlags);
+
+    /**
+     * See the same constant in nsIFileInputStream. The deferred open will
+     * be performed when one of the following is called:
+     *   - Seek
+     *   - Tell
+     *   - SetEOF
+     *   - Available
+     *   - Read
+     *   - Flush
+     *   - Write
+     *   - GetSize
+     *   - GetLastModified
+     *
+     * @note Using this flag results in the file not being opened
+     *       during the call to Init.  This means that any errors that might
+     *       happen when this flag is not set would happen during the
+     *       first read or write. The file is not locked when Init is called,
+     *       so it might be deleted before we try to read from it and if the
+     *       file is to be created, then it will not appear on the disk until
+     *       the first write.
+     */
+    const long DEFER_OPEN = 1<<0;
+};
+
+/**
+ * An interface that allows you to get some metadata like file size and
+ * file last modified time. These methods and attributes can throw
+ * NS_BASE_STREAM_WOULD_BLOCK in case the informations are not available yet.
+ * If this happens, consider the use of nsIAsyncFileMetadata.
+ *
+ * If using nsIAsyncFileMetadata, you should retrieve any data via this
+ * interface before taking any action that might consume the underlying stream.
+ * For example, once Available(), Read(), or nsIAsyncInputStream::AsyncWait()
+ * are invoked, these methods may return NS_BASE_STREAM_CLOSED.  This will
+ * happen when using RemoteLazyInputStream with an underlying file stream, for
+ * example.
+ */
+[scriptable, uuid(07f679e4-9601-4bd1-b510-cd3852edb881)]
+interface nsIFileMetadata : nsISupports
+{
+    /**
+     * File size in bytes.
+     */
+    readonly attribute long long size;
+
+    /**
+     * File last modified time in milliseconds from midnight (00:00:00),
+     * January 1, 1970 Greenwich Mean Time (GMT).
+     */
+    readonly attribute long long lastModified;
+
+    /**
+     * The internal file descriptor. It can be used for memory mapping of the
+     * underlying file. Please use carefully! If this returns
+     * NS_BASE_STREAM_WOULD_BLOCK, consider the use of nsIAsyncFileMetadata.
+     */
+    [noscript] PRFileDescPtr getFileDescriptor();
+};
+
+[scriptable, uuid(de15b80b-29ba-4b7f-9220-a3d75b17ae8c)]
+interface nsIAsyncFileMetadata : nsIFileMetadata
+{
+    /**
+     * Asynchronously wait for the object to be ready.
+     *
+     * @param aCallback The callback will be used when the stream is ready to
+     *                  return File metadata. Use a nullptr to cancel a
+     *                  previous operation.
+     *
+     * @param aEventTarget The event target where aCallback will be executed.
+     *                     If aCallback is passed, aEventTarget cannot be null.
+     */
+    void asyncFileMetadataWait(in nsIFileMetadataCallback aCallback,
+                               in nsIEventTarget aEventTarget);
+};
+
+/**
+ * This is a companion interface for
+ * nsIAsyncFileMetadata::asyncFileMetadataWait.
+ */
+[function, scriptable, uuid(d01c7ead-7ba3-4726-b399-618ec8ec7057)]
+interface nsIFileMetadataCallback : nsISupports
+{
+    /**
+     * Called to indicate that the nsIFileMetadata object is ready.
+     */
+    void onFileMetadataReady(in nsIAsyncFileMetadata aObject);
+};