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 int	getAppVersionCode(Context context)
static java.lang.String[]	getSupportedAbis() Return an list of ABIs we supported on this device ordered according to preference.
static boolean	is64Bit()
static byte[]	makeApkDepBlock(java.io.File apkFile, Context context)

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

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()