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	dumbDelete(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	fsyncAll(java.io.File fileName)
static long	getApkDepBlockLength(java.io.File apkFile) Retrieve the size of dependency file.
static int	getAppVersionCode(android.content.Context context)
static java.lang.String	getBaseName(java.lang.String fileName) Gets the base name, without extension, of given file name.
static java.lang.String	getClassLoaderLdLoadLibrary()
static FileLocker	getFileLocker(java.io.File lockFileName)
static java.lang.reflect.Method	getNativeLoadRuntimeMethod()
static FileLocker	getOrCreateLockOnDir(java.io.File soDirectory, java.io.File lockFileName)
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(android.content.Context context)
static boolean	isSupportedDirectLoad(android.content.Context context, int appType)
static byte[]	makeApkDepBlock(java.io.File apkFile, android.content.Context context) N.B.
static java.lang.String	makeNonZipPath(java.lang.String localLdLibraryPath)
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 - IOException

dumbDelete

public static void dumbDelete(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 - 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 - IOException

fsyncAll

public static void fsyncAll(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

Retrieve the size of dependency file.

Parameters:

apkFile - the apk file

Returns:

the size of dependency file

Throws:

java.io.IOException - IOException

makeApkDepBlock

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

N.B. If this method is changed, the above method getApkDepBlockLength(java.io.File) must also be updated to reflect the expected size of the dep block

Parameters:

apkFile - apk file

context - application context

Returns:

dependency file in bytes

Throws:

java.io.IOException - IOException

getAppVersionCode

public static int getAppVersionCode(android.content.Context context)

is64Bit

public static boolean is64Bit()

isSupportedDirectLoad

public static boolean isSupportedDirectLoad(@Nullable
                                            android.content.Context context,
                                            int appType)

isDisabledExtractNativeLibs

public static boolean isDisabledExtractNativeLibs(android.content.Context context)

getOrCreateLockOnDir

@Nullable
public static FileLocker getOrCreateLockOnDir(java.io.File soDirectory,
                                                        java.io.File lockFileName)
                                                 throws java.io.IOException

Throws:

java.io.IOException

getFileLocker

public static FileLocker getFileLocker(java.io.File lockFileName)
                                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.

Parameters:

fileName - full file name

Returns:

base name

makeNonZipPath

@Nullable
public static java.lang.String makeNonZipPath(@Nullable
                                                        java.lang.String localLdLibraryPath)

getClassLoaderLdLoadLibrary

@Nullable
public static java.lang.String getClassLoaderLdLoadLibrary()

getNativeLoadRuntimeMethod

@Nullable
public static java.lang.reflect.Method getNativeLoadRuntimeMethod()