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distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at
    http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.crypto;

import java.io.IOException;
import java.util.HashMap;
import java.util.Locale;

Provides OS name and architecture name.
Used by the JNI make process to get information from the build environment.
/**
 * Provides OS name and architecture name.
 * Used by the JNI make process to get information from the build environment.
 */
final class OsInfo {
    private final static HashMap<String, String> archMapping = new HashMap<>();

    
The constant string represents for X86 architecture, the value is: "x86". /**
     * The constant string represents for X86 architecture, the value is:
     * {@value #X86}.
     */
    static final String X86 = "x86";

    
The constant string represents for X86_64 architecture, the value is: "x86_64". /**
     * The constant string represents for X86_64 architecture, the value is:
     * {@value #X86_64}.
     */
    static final String X86_64 = "x86_64";

    
The constant string represents for IA64_32 architecture, the value is: "ia64_32". /**
     * The constant string represents for IA64_32 architecture, the value is:
     * {@value #IA64_32}.
     */
    static final String IA64_32 = "ia64_32";

    
The constant string represents for IA64 architecture, the value is: "ia64". /**
     * The constant string represents for IA64 architecture, the value is:
     * {@value #IA64}.
     */
    static final String IA64 = "ia64";

    
The constant string represents for PPC architecture, the value is: "ppc". /**
     * The constant string represents for PPC architecture, the value is:
     * {@value #PPC}.
     */
    static final String PPC = "ppc";

    
The constant string represents for PPC64 architecture, the value is: "ppc64". /**
     * The constant string represents for PPC64 architecture, the value is:
     * {@value #PPC64}.
     */
    static final String PPC64 = "ppc64";

    
The private constructor of OsInfo. /**
     * The private constructor of {@link OsInfo}.
     */
    private OsInfo() {
    }

    static {
        // x86 mappings
        archMapping.put(X86, X86);
        archMapping.put("i386", X86);
        archMapping.put("i486", X86);
        archMapping.put("i586", X86);
        archMapping.put("i686", X86);
        archMapping.put("pentium", X86);

        // x86_64 mappings
        archMapping.put(X86_64, X86_64);
        archMapping.put("amd64", X86_64);
        archMapping.put("em64t", X86_64);
        archMapping.put("universal", X86_64); // Needed for openjdk7 in Mac

        // Itenium 64-bit mappings
        archMapping.put(IA64, IA64);
        archMapping.put("ia64w", IA64);

        // Itenium 32-bit mappings, usually an HP-UX construct
        archMapping.put(IA64_32, IA64_32);
        archMapping.put("ia64n", IA64_32);

        // PowerPC mappings
        archMapping.put(PPC, PPC);
        archMapping.put("power", PPC);
        archMapping.put("powerpc", PPC);
        archMapping.put("power_pc", PPC);
        archMapping.put("power_rs", PPC);

        // TODO: PowerPC 64bit mappings
        archMapping.put(PPC64, PPC64);
        archMapping.put("power64", PPC64);
        archMapping.put("powerpc64", PPC64);
        archMapping.put("power_pc64", PPC64);
        archMapping.put("power_rs64", PPC64);
    }

    
The main method.
This is used by the JNI make processing in Makefile.common
Params:
args – the argv./**
     * The main method.
     * This is used by the JNI make processing in Makefile.common
     *
     * @param args the argv.
     */
    public static void main(String[] args) {
        if (args.length >= 1) {
            if ("--os".equals(args[0])) {
                System.out.print(getOSName());
                return;
            } else if ("--arch".equals(args[0])) {
                System.out.print(getArchName());
                return;
            }
        }

        System.out.print(getNativeLibFolderPathForCurrentOS());
    }

    
Gets the native lib folder.
Returns:
the current OS's native lib folder./**
     * Gets the native lib folder.
     *
     * @return the current OS's native lib folder.
     */
    static String getNativeLibFolderPathForCurrentOS() {
        return getOSName() + "/" + getArchName();
    }

    
Gets the OS name.
Returns:
the OS name./**
     * Gets the OS name.
     *
     * @return the OS name.
     */
    static String getOSName() {
        return translateOSNameToFolderName(System.getProperty("os.name"));
    }

    
Gets the architecture name.
Returns:
the architecture name./**
     * Gets the architecture name.
     *
     * @return the architecture name.
     */
    static String getArchName() {
        // if running Linux on ARM, need to determine ABI of JVM
        String osArch = System.getProperty("os.arch");
        if (osArch.startsWith("arm")
                && System.getProperty("os.name").contains("Linux")) {
            String javaHome = System.getProperty("java.home");
            try {
                // determine if first JVM found uses ARM hard-float ABI
                String[] cmdarray = {
                        "/bin/sh",
                        "-c",
                        "find '"
                                + javaHome
                                + "' -name 'libjvm.so' | head -1 | xargs readelf -A | "
                                + "grep 'Tag_ABI_VFP_args: VFP registers'" };
                int exitCode = Runtime.getRuntime().exec(cmdarray).waitFor();
                if (exitCode == 0) {
                    return "armhf";
                }
            } catch (IOException e) { //NOPMD
                // ignored: fall back to "arm" arch (soft-float ABI)
            } catch (InterruptedException e) { //NOPMD
                // ignored: fall back to "arm" arch (soft-float ABI)
            }
        } else {
            String lc = osArch.toLowerCase(Locale.US);
            if (archMapping.containsKey(lc)) {
                return archMapping.get(lc);
            }
        }
        return translateArchNameToFolderName(osArch);
    }

    
Translates the OS name to folder name.
Params:
osName – the OS name.
Returns:
the folder name./**
     * Translates the OS name to folder name.
     *
     * @param osName the OS name.
     * @return the folder name.
     */
    private static String translateOSNameToFolderName(String osName) {
        if (osName.contains("Windows")) {
            return "Windows";
        } else if (osName.contains("Mac")) {
            return "Mac";
        } else if (osName.contains("Linux")) {
            return "Linux";
        } else if (osName.contains("AIX")) {
            return "AIX";
        }

        else {
            return osName.replaceAll("\\W", "");
        }
    }

    
Translates the architecture name to folder name.
Params:
archName – the architecture name.
Returns:
the folder name./**
     * Translates the architecture name to folder name.
     *
     * @param archName the architecture name.
     * @return the folder name.
     */
    private static String translateArchNameToFolderName(String archName) {
        return archName.replaceAll("\\W", "");
    }
}