Check if system libc.so is 32 bit or 64 bit - Android Android OS

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Description

Check if system libc.so is 32 bit or 64 bit

Demo Code


//package com.java2s;

import android.util.Log;

import java.io.File;
import java.io.FileInputStream;

public class Main {

    private static final int EI_CLASS = 4;

    private static final int ELFCLASS64 = 2;
    /** The system libc.so file path */
    private static final String SYSTEM_LIB_C_PATH = "/system/lib/libc.so";
    private static final String SYSTEM_LIB_C_PATH_64 = "/system/lib64/libc.so";
    private static boolean LOGENABLE = false;

    /**//from   ww  w  .j  av  a  2  s  . c o m
     * Check if system libc.so is 32 bit or 64 bit
     */
    private static boolean isLibc64() {
        File libcFile = new File(SYSTEM_LIB_C_PATH);
        if (libcFile != null && libcFile.exists()) {
            byte[] header = readELFHeadrIndentArray(libcFile);
            if (header != null && header[EI_CLASS] == ELFCLASS64) {

                return true;
            }
        }

        File libcFile64 = new File(SYSTEM_LIB_C_PATH_64);
        if (libcFile64 != null && libcFile64.exists()) {
            byte[] header = readELFHeadrIndentArray(libcFile64);
            if (header != null && header[EI_CLASS] == ELFCLASS64) {
    
                return true;
            }
        }

        return false;
    }

    private static byte[] readELFHeadrIndentArray(File libFile) {
        if (libFile != null && libFile.exists()) {
            FileInputStream inputStream = null;
            try {
                inputStream = new FileInputStream(libFile);
                if (inputStream != null) {
                    byte[] tempBuffer = new byte[16];
                    int count = inputStream.read(tempBuffer, 0, 16);
                    if (count == 16) {
                        return tempBuffer;
                    } 
                }
            } catch (Throwable t) {
      
            } finally {
                if (inputStream != null) {
                    try {
                        inputStream.close();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }
        }

        return null;
    }
}

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