com.facebook.soloader

Class SysUtil

java.lang.Object

com.facebook.soloader.SysUtil

public final class SysUtil
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
SysUtil()

Method Summary

Modifier and Type	Method and Description
static void	deleteOrThrow(java.io.File file)
static void	dumbDeleteRecursive(java.io.File file) Delete a directory and its contents.
static void	fallocateIfSupported(java.io.FileDescriptor fd, long length) Pre-allocate disk space for a file if we can do that on this version of the OS.
static int	findAbiScore(java.lang.String[] supportedAbis, java.lang.String abi) Determine how preferred a given ABI is on this system.
static void	fsyncRecursive(java.io.File fileName)
static long	getApkDepBlockLength(java.io.File apkFile)
static int	getAppVersionCode(Context context)
static java.lang.String	getBaseName(java.lang.String fileName) Gets the base name, without extension, of given file name.
static FileLocker	getOrCreateLockOnDir(java.io.File soDirectory, java.io.File lockFileName, boolean blocking)
static java.lang.String[]	getSupportedAbis() Return an list of ABIs we supported on this device ordered according to preference.
static boolean	is64Bit()
static boolean	isDisabledExtractNativeLibs(Context context)
static boolean	isSupportedDirectLoad(Context context, int appType)
static byte[]	makeApkDepBlock(java.io.File apkFile, Context context)
static void	mkdirOrThrow(java.io.File dir) Like File.mkdirs, but throws on error.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SysUtil

public SysUtil()

Method Detail

findAbiScore

public static int findAbiScore(java.lang.String[] supportedAbis,
                               java.lang.String abi)

Determine how preferred a given ABI is on this system.

Parameters:

supportedAbis - ABIs on this system

abi - ABI of a shared library we might want to unpack

Returns:

-1 if not supported or an integer, smaller being more preferred

deleteOrThrow

public static void deleteOrThrow(java.io.File file)
                          throws java.io.IOException

Throws:

java.io.IOException

getSupportedAbis

public static java.lang.String[] getSupportedAbis()

Return an list of ABIs we supported on this device ordered according to preference. Use a separate inner class to isolate the version-dependent call where it won't cause the whole class to fail preverification.

Returns:

Ordered array of supported ABIs

fallocateIfSupported

public static void fallocateIfSupported(java.io.FileDescriptor fd,
                                        long length)
                                 throws java.io.IOException

Pre-allocate disk space for a file if we can do that on this version of the OS.

Parameters:

fd - File descriptor for file

length - Number of bytes to allocate.

Throws:

java.io.IOException

dumbDeleteRecursive

public static void dumbDeleteRecursive(java.io.File file)
                                throws java.io.IOException

Delete a directory and its contents.

WARNING: Java APIs do not let us distinguish directories from symbolic links to directories. Consequently, if the directory contains symbolic links to directories, we will attempt to delete the contents of pointed-to directories.

Parameters:

file - File or directory to delete

Throws:

java.io.IOException

mkdirOrThrow

public static void mkdirOrThrow(java.io.File dir)
                         throws java.io.IOException

Like File.mkdirs, but throws on error. Succeeds even if File.mkdirs "fails", but dir still names a directory.

Parameters:

dir - Directory to create. All parents created as well.

Throws:

java.io.IOException

fsyncRecursive

public static void fsyncRecursive(java.io.File fileName)
                           throws java.io.IOException

Throws:

java.io.IOException

getApkDepBlockLength

public static long getApkDepBlockLength(java.io.File apkFile)
                                 throws java.io.IOException

Throws:

java.io.IOException

makeApkDepBlock

public static byte[] makeApkDepBlock(java.io.File apkFile,
                                     Context context)
                              throws java.io.IOException

Throws:

java.io.IOException

getAppVersionCode

public static int getAppVersionCode(Context context)

is64Bit

public static boolean is64Bit()

isSupportedDirectLoad

public static boolean isSupportedDirectLoad(Context context,
                                            int appType)
                                     throws java.io.IOException

Throws:

java.io.IOException

isDisabledExtractNativeLibs

public static boolean isDisabledExtractNativeLibs(Context context)

getOrCreateLockOnDir

public static FileLocker getOrCreateLockOnDir(java.io.File soDirectory,
                                              java.io.File lockFileName,
                                              boolean blocking)
                                       throws java.io.IOException

Throws:

java.io.IOException

getBaseName

public static java.lang.String getBaseName(java.lang.String fileName)

Gets the base name, without extension, of given file name.