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57 lines
2.5 KiB
Plaintext
57 lines
2.5 KiB
Plaintext
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// Copyright 2017 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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module media.mojom;
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import "mojo/common/file.mojom";
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// Provides a way to organize persistent per-origin/per-cdm-type data
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// in the browser's file system.
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interface CdmStorage {
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enum Status {
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kSuccess, // File was successfully opened.
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kInUse, // File is already open by another client.
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kFailure // Unable to open file.
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};
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// Opens the file specified by |file_name| for read only. Writing to the file
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// is done using a temporary file created with the CdmFile interface returned.
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// Can be called multiple times for different files, or for the same file if
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// the first one has been closed. If successful, kSuccess will be returned,
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// |file_for_reading| can be used to read the contents, and |cdm_file| should
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// be closed when access to the file is no longer needed (i.e. file closed).
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// On failure, |status| <> kSuccess and |file_for_reading| and |cdm_file|
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// are null.
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// - If the file is already opened, kInUse will be returned in |status|.
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// - |file_name| must not contain forward slash ('/') or backslash ('\'),
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// and must not start with an underscore ('_'). If this happens,
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// |status| == kFailure is returned.
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Open(string file_name)
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=> (Status status,
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mojo.common.mojom.File? file_for_reading,
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associated CdmFile? cdm_file);
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};
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// Provides a way to keep track of the file opened. When the connection to this
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// object is broken, it is assumed that the file has been closed and that no
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// more operations will be performed on it.
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//
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// This interface is also used to be able to write to the file. Due to sandbox
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// restrictions on some platforms (crbug.com/774762), setting the length of the
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// file explicitly is not allowed in sandboxed processes. To get around this
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// (and avoid file corruption issues), writing is done by opening a new file,
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// letting the client write to it, and then replace the original file after
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// writing.
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interface CdmFile {
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// Open a new file that can be written to. This file will be in the same
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// directory as the original file. If successful, returns |file_for_writing|
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// which can be written to.
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OpenFileForWriting() => (mojo.common.mojom.File? file_for_writing);
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// Closes the file opened for writing and replaces the original file.
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// Returns a new file descriptor that should be used to read the original
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// file from now on.
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CommitWrite() => (mojo.common.mojom.File? updated_file_for_reading);
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};
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