зеркало из https://github.com/mozilla/gecko-dev.git
515 строки
17 KiB
Plaintext
515 строки
17 KiB
Plaintext
/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* 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/.
|
|
*/
|
|
|
|
/**
|
|
* IOUtils is a simple, efficient interface for performing file I/O from a
|
|
* privileged chrome-only context. All asynchronous I/O tasks are run on
|
|
* a background thread.
|
|
*
|
|
* Pending I/O tasks will block shutdown at the |profileBeforeChange| phase.
|
|
* During this shutdown phase, no additional I/O tasks will be accepted --
|
|
* method calls to this interface will reject once shutdown has entered this
|
|
* phase.
|
|
*
|
|
* IOUtils methods may reject for any number of reasons. Reasonable attempts
|
|
* have been made to map each common operating system error to a |DOMException|.
|
|
* Most often, a caller only needs to check if a given file wasn't found by
|
|
* catching the rejected error and checking if |ex.name === 'NotFoundError'|.
|
|
* In other cases, it is likely sufficient to allow the error to be caught and
|
|
* reported elsewhere.
|
|
*/
|
|
[ChromeOnly, Exposed=(Window, Worker)]
|
|
namespace IOUtils {
|
|
/**
|
|
* Reads up to |opts.maxBytes| of the file at |path| according to |opts|.
|
|
*
|
|
* NB: The maximum file size that can be read is UINT32_MAX.
|
|
*
|
|
* @param path An absolute file path.
|
|
*
|
|
* @return Resolves with an array of unsigned byte values read from disk,
|
|
* otherwise rejects with a DOMException.
|
|
*/
|
|
Promise<Uint8Array> read(DOMString path, optional ReadOptions opts = {});
|
|
/**
|
|
* Reads the UTF-8 text file located at |path| and returns the decoded
|
|
* contents as a |DOMString|.
|
|
*
|
|
* NB: The maximum file size that can be read is UINT32_MAX.
|
|
*
|
|
* @param path An absolute file path.
|
|
*
|
|
* @return Resolves with the file contents encoded as a string, otherwise
|
|
* rejects with a DOMException.
|
|
*/
|
|
Promise<UTF8String> readUTF8(DOMString path, optional ReadUTF8Options opts = {});
|
|
/**
|
|
* Read the UTF-8 text file located at |path| and return the contents
|
|
* parsed as JSON into a JS value.
|
|
*
|
|
* NB: The maximum file size that can be read is UINT32_MAX.
|
|
*
|
|
* @param path An absolute path.
|
|
*
|
|
* @return Resolves with the contents of the file parsed as JSON.
|
|
*/
|
|
Promise<any> readJSON(DOMString path, optional ReadUTF8Options opts = {});
|
|
/**
|
|
* Attempts to safely write |data| to a file at |path|.
|
|
*
|
|
* This operation can be made atomic by specifying the |tmpPath| option. If
|
|
* specified, then this method ensures that the destination file is not
|
|
* modified until the data is entirely written to the temporary file, after
|
|
* which point the |tmpPath| is moved to the specified |path|.
|
|
*
|
|
* The target file can also be backed up to a |backupFile| before any writes
|
|
* are performed to prevent data loss in case of corruption.
|
|
*
|
|
* @param path An absolute file path.
|
|
* @param data Data to write to the file at path.
|
|
*
|
|
* @return Resolves with the number of bytes successfully written to the file,
|
|
* otherwise rejects with a DOMException.
|
|
*/
|
|
Promise<unsigned long long> write(DOMString path, Uint8Array data, optional WriteOptions options = {});
|
|
/**
|
|
* Attempts to encode |string| to UTF-8, then safely write the result to a
|
|
* file at |path|. Works exactly like |write|.
|
|
*
|
|
* @param path An absolute file path.
|
|
* @param string A string to write to the file at path.
|
|
* @param options Options for writing the file.
|
|
*
|
|
* @return Resolves with the number of bytes successfully written to the file,
|
|
* otherwise rejects with a DOMException.
|
|
*/
|
|
Promise<unsigned long long> writeUTF8(DOMString path, UTF8String string, optional WriteOptions options = {});
|
|
/**
|
|
* Attempts to serialize |value| into a JSON string and encode it as into a
|
|
* UTF-8 string, then safely write the result to a file at |path|. Works
|
|
* exactly like |write|.
|
|
*
|
|
* @param path An absolute file path
|
|
* @param value The value to be serialized.
|
|
* @param options Options for writing the file. The "append" mode is not supported.
|
|
*
|
|
* @return Resolves with the number of bytes successfully written to the file,
|
|
* otherwise rejects with a DOMException.
|
|
*/
|
|
Promise<unsigned long long> writeJSON(DOMString path, any value, optional WriteOptions options = {});
|
|
/**
|
|
* Moves the file from |sourcePath| to |destPath|, creating necessary parents.
|
|
* If |destPath| is a directory, then the source file will be moved into the
|
|
* destination directory.
|
|
*
|
|
* @param sourcePath An absolute file path identifying the file or directory
|
|
* to move.
|
|
* @param destPath An absolute file path identifying the destination
|
|
* directory and/or file name.
|
|
*
|
|
* @return Resolves if the file is moved successfully, otherwise rejects with
|
|
* a DOMException.
|
|
*/
|
|
Promise<void> move(DOMString sourcePath, DOMString destPath, optional MoveOptions options = {});
|
|
/**
|
|
* Removes a file or directory at |path| according to |options|.
|
|
*
|
|
* @param path An absolute file path identifying the file or directory to
|
|
* remove.
|
|
*
|
|
* @return Resolves if the file is removed successfully, otherwise rejects
|
|
* with a DOMException.
|
|
*/
|
|
Promise<void> remove(DOMString path, optional RemoveOptions options = {});
|
|
/**
|
|
* Creates a new directory at |path| according to |options|.
|
|
*
|
|
* @param path An absolute file path identifying the directory to create.
|
|
*
|
|
* @return Resolves if the directory is created successfully, otherwise
|
|
* rejects with a DOMException.
|
|
*/
|
|
Promise<void> makeDirectory(DOMString path, optional MakeDirectoryOptions options = {});
|
|
/**
|
|
* Obtains information about a file, such as size, modification dates, etc.
|
|
*
|
|
* @param path An absolute file path identifying the file or directory to
|
|
* inspect.
|
|
*
|
|
* @return Resolves with a |FileInfo| object for the file at path, otherwise
|
|
* rejects with a DOMException.
|
|
*
|
|
* @see FileInfo
|
|
*/
|
|
Promise<FileInfo> stat(DOMString path);
|
|
/**
|
|
* Copies a file or directory from |sourcePath| to |destPath| according to
|
|
* |options|.
|
|
*
|
|
* @param sourcePath An absolute file path identifying the source file to be
|
|
* copied.
|
|
* @param destPath An absolute file path identifying the location for the
|
|
* copy.
|
|
*
|
|
* @return Resolves if the file was copied successfully, otherwise rejects
|
|
* with a DOMException.
|
|
*/
|
|
Promise<void> copy(DOMString sourcePath, DOMString destPath, optional CopyOptions options = {});
|
|
/**
|
|
* Updates the |modification| time for the file at |path|.
|
|
*
|
|
* @param path An absolute file path identifying the file whose
|
|
* modification time is to be set. This file must exist
|
|
* and will not be created.
|
|
* @param modification An optional modification time for the file expressed in
|
|
* milliseconds since the Unix epoch
|
|
* (1970-01-01T00:00:00Z). The current system time is used
|
|
* if this parameter is not provided.
|
|
*
|
|
* @return Resolves with the updated modification time expressed in
|
|
* milliseconds since the Unix epoch, otherwise rejects with a
|
|
* DOMException.
|
|
*/
|
|
Promise<long long> setModificationTime(DOMString path, optional long long modification);
|
|
/**
|
|
* Retrieves a (possibly empty) list of immediate children of the directory at
|
|
* |path|.
|
|
*
|
|
* @param path An absolute file path.
|
|
*
|
|
* @return Resolves with a sequence of absolute file paths representing the
|
|
* children of the directory at |path|, otherwise rejects with a
|
|
* DOMException.
|
|
*/
|
|
Promise<sequence<DOMString>> getChildren(DOMString path, optional GetChildrenOptions options = {});
|
|
/**
|
|
* Set the permissions of the file at |path|.
|
|
*
|
|
* Windows does not make a distinction between user, group, and other
|
|
* permissions like UNICES do. If a permission flag is set for any of user,
|
|
* group, or other has a permission, then all users will have that
|
|
* permission. Additionally, Windows does not support setting the
|
|
* "executable" permission.
|
|
*
|
|
* @param path An absolute file path
|
|
* @param permissions The UNIX file mode representing the permissions.
|
|
* @param honorUmask If omitted or true, any UNIX file mode value is
|
|
* modified by the process umask. If false, the exact value
|
|
* of UNIX file mode will be applied. This value has no effect
|
|
* on Windows.
|
|
*
|
|
* @return Resolves if the permissions were set successfully, otherwise
|
|
* rejects with a DOMException.
|
|
*/
|
|
Promise<void> setPermissions(DOMString path, unsigned long permissions, optional boolean honorUmask = true);
|
|
/**
|
|
* Return whether or not the file exists at the given path.
|
|
*
|
|
* @param path An absolute file path.
|
|
*
|
|
* @return A promise that resolves to whether or not the given file exists.
|
|
*/
|
|
Promise<boolean> exists(DOMString path);
|
|
|
|
#if defined(XP_WIN)
|
|
/**
|
|
* Return the Windows-specific file attributes of the file at the given path.
|
|
*
|
|
* @param path An absolute file path.
|
|
*
|
|
* @return A promise that resolves to the Windows-specific file attributes.
|
|
*/
|
|
Promise<WindowsFileAttributes> getWindowsAttributes(DOMString path);
|
|
|
|
/**
|
|
* Set the Windows-specific file attributes of the file at the given path.
|
|
*
|
|
* @param path An absolute file path.
|
|
* @param attrs The attributes to set. Attributes will only be set if they are
|
|
* |true| or |false| (i.e., |undefined| attributes are not
|
|
* changed).
|
|
*
|
|
* @return A promise that resolves is the attributes were set successfully.
|
|
*/
|
|
Promise<void> setWindowsAttributes(DOMString path, optional WindowsFileAttributes attrs = {});
|
|
#endif
|
|
|
|
};
|
|
|
|
[Exposed=Window]
|
|
partial namespace IOUtils {
|
|
[Throws]
|
|
readonly attribute any profileBeforeChange;
|
|
};
|
|
|
|
[Exposed=Worker]
|
|
partial namespace IOUtils {
|
|
/**
|
|
* Synchronously opens the file at |path|. This API is only available in workers.
|
|
*
|
|
* @param path An absolute file path.
|
|
*
|
|
* @return A |SyncReadFile| object for the file.
|
|
*/
|
|
[Throws]
|
|
SyncReadFile openFileForSyncReading(DOMString path);
|
|
};
|
|
|
|
/**
|
|
* An object representing an open file, allowing parts of the file contents to be
|
|
* read synchronously. Only available in workers.
|
|
*/
|
|
[ChromeOnly, Exposed=Worker]
|
|
interface SyncReadFile {
|
|
/**
|
|
* The file size, in bytes.
|
|
*/
|
|
readonly attribute long long size;
|
|
|
|
/**
|
|
* Synchronously read |dest.length| bytes at offset |offset| into |dest|.
|
|
* Throws if the file has been closed already or if the read would be out-of-bounds.
|
|
*
|
|
* @param dest A Uint8Array whose entire contents will be overwritten with
|
|
* bytes read from the file.
|
|
* @param offset The file offset at which the read range begins. (The length of the
|
|
* range is given by |dest.length|.)
|
|
*/
|
|
[Throws]
|
|
void readBytesInto(Uint8Array dest, long long offset);
|
|
|
|
/**
|
|
* Close the file. Subsequent calls to readBytesInto will throw.
|
|
* If the file is not closed manually, it will be closed once this object is GC'ed.
|
|
*/
|
|
void close();
|
|
};
|
|
|
|
/**
|
|
* Options to be passed to the |IOUtils.readUTF8| method.
|
|
*/
|
|
dictionary ReadUTF8Options {
|
|
/**
|
|
* If true, this option indicates that the file to be read is compressed with
|
|
* LZ4-encoding, and should be decompressed before the data is returned to
|
|
* the caller.
|
|
*/
|
|
boolean decompress = false;
|
|
};
|
|
|
|
/**
|
|
* Options to be passed to the |IOUtils.read| method.
|
|
*/
|
|
dictionary ReadOptions : ReadUTF8Options {
|
|
/**
|
|
* The offset into the file to read from. If unspecified, the file will be read
|
|
* from the start.
|
|
*/
|
|
unsigned long long offset = 0;
|
|
|
|
/**
|
|
* The max bytes to read from the file at path. If unspecified, the entire
|
|
* file will be read. This option is incompatible with |decompress|.
|
|
*/
|
|
unsigned long? maxBytes = null;
|
|
};
|
|
|
|
/**
|
|
* Modes for writing to a file.
|
|
*/
|
|
enum WriteMode {
|
|
/**
|
|
* Overwrite the contents of the file.
|
|
*
|
|
* The file will be created if it does not exist.
|
|
*/
|
|
"overwrite",
|
|
/**
|
|
* Append to the end of the file.
|
|
*
|
|
* This mode will refuse to create the file if it does not exist.
|
|
*/
|
|
"append",
|
|
/**
|
|
* Create a new file.
|
|
*
|
|
* This mode will refuse to overwrite an existing file.
|
|
*/
|
|
"create",
|
|
};
|
|
|
|
/**
|
|
* Options to be passed to the |IOUtils.write| and |writeUTF8|
|
|
* methods.
|
|
*/
|
|
dictionary WriteOptions {
|
|
/**
|
|
* If specified, backup the destination file to this path before writing.
|
|
*/
|
|
DOMString backupFile;
|
|
/**
|
|
* If specified, write the data to a file at |tmpPath| instead of directly to
|
|
* the destination. Once the write is complete, the destination will be
|
|
* overwritten by a move. Specifying this option will make the write a little
|
|
* slower, but also safer.
|
|
*/
|
|
DOMString tmpPath;
|
|
/**
|
|
* The mode used to write to the file.
|
|
*/
|
|
WriteMode mode = "overwrite";
|
|
/**
|
|
* If true, force the OS to write its internal buffers to the disk.
|
|
* This is considerably slower for the whole system, but safer in case of
|
|
* an improper system shutdown (e.g. due to a kernel panic) or device
|
|
* disconnection before the buffers are flushed.
|
|
*/
|
|
boolean flush = false;
|
|
/**
|
|
* If true, compress the data with LZ4-encoding before writing to the file.
|
|
*/
|
|
boolean compress = false;
|
|
};
|
|
|
|
/**
|
|
* Options to be passed to the |IOUtils.move| method.
|
|
*/
|
|
dictionary MoveOptions {
|
|
/**
|
|
* If true, fail if the destination already exists.
|
|
*/
|
|
boolean noOverwrite = false;
|
|
};
|
|
|
|
/**
|
|
* Options to be passed to the |IOUtils.remove| method.
|
|
*/
|
|
dictionary RemoveOptions {
|
|
/**
|
|
* If true, no error will be reported if the target file is missing.
|
|
*/
|
|
boolean ignoreAbsent = true;
|
|
/**
|
|
* If true, and the target is a directory, recursively remove files.
|
|
*/
|
|
boolean recursive = false;
|
|
};
|
|
|
|
/**
|
|
* Options to be passed to the |IOUtils.makeDirectory| method.
|
|
*/
|
|
dictionary MakeDirectoryOptions {
|
|
/**
|
|
* If true, create the directory and all necessary ancestors if they do not
|
|
* already exist. If false and any ancestor directories do not exist,
|
|
* |makeDirectory| will reject with an error.
|
|
*/
|
|
boolean createAncestors = true;
|
|
/**
|
|
* If true, succeed even if the directory already exists (default behavior).
|
|
* Otherwise, fail if the directory already exists.
|
|
*/
|
|
boolean ignoreExisting = true;
|
|
/**
|
|
* The file mode to create the directory with.
|
|
*
|
|
* This is ignored on Windows.
|
|
*/
|
|
unsigned long permissions = 0755;
|
|
|
|
};
|
|
|
|
/**
|
|
* Options to be passed to the |IOUtils.copy| method.
|
|
*/
|
|
dictionary CopyOptions {
|
|
/**
|
|
* If true, fail if the destination already exists.
|
|
*/
|
|
boolean noOverwrite = false;
|
|
/**
|
|
* If true, copy the source recursively.
|
|
*/
|
|
boolean recursive = false;
|
|
};
|
|
|
|
/**
|
|
* Options to be passed to the |IOUtils.getChildren| method.
|
|
*/
|
|
dictionary GetChildrenOptions {
|
|
/**
|
|
* If true, no error will be reported if the target file is missing.
|
|
*/
|
|
boolean ignoreAbsent = false;
|
|
};
|
|
|
|
/**
|
|
* Types of files that are recognized by the |IOUtils.stat| method.
|
|
*/
|
|
enum FileType { "regular", "directory", "other" };
|
|
|
|
/**
|
|
* Basic metadata about a file.
|
|
*/
|
|
dictionary FileInfo {
|
|
/**
|
|
* The absolute path to the file on disk, as known when this file info was
|
|
* obtained.
|
|
*/
|
|
DOMString path;
|
|
/**
|
|
* Identifies if the file at |path| is a regular file, directory, or something
|
|
* something else.
|
|
*/
|
|
FileType type;
|
|
/**
|
|
* If this represents a regular file, the size of the file in bytes.
|
|
* Otherwise, -1.
|
|
*/
|
|
long long size;
|
|
/**
|
|
* The timestamp of the last file modification, represented in milliseconds
|
|
* since Epoch (1970-01-01T00:00:00.000Z).
|
|
*/
|
|
long long lastModified;
|
|
|
|
/**
|
|
* The timestamp of file creation, represented in milliseconds since Epoch
|
|
* (1970-01-01T00:00:00.000Z).
|
|
*
|
|
* This is only available on MacOS and Windows.
|
|
*/
|
|
long long creationTime;
|
|
/**
|
|
* The permissions of the file, expressed as a UNIX file mode.
|
|
*
|
|
* NB: Windows does not make a distinction between user, group, and other
|
|
* permissions like UNICES do. The user, group, and other parts will always
|
|
* be identical on Windows.
|
|
*/
|
|
unsigned long permissions;
|
|
};
|
|
|
|
#ifdef XP_WIN
|
|
/**
|
|
* Windows-specific file attributes.
|
|
*/
|
|
dictionary WindowsFileAttributes {
|
|
/**
|
|
* Whether or not the file is read-only.
|
|
*/
|
|
boolean readOnly;
|
|
/**
|
|
* Whether or not the file is hidden.
|
|
*/
|
|
boolean hidden;
|
|
/**
|
|
* Whether or not the file is classified as a system file.
|
|
*/
|
|
boolean system;
|
|
};
|
|
#endif
|