IOHelper.java

/**
 * Copyright 2014 
 * SMEdit https://github.com/StarMade/SMEdit
 * SMTools https://github.com/StarMade/SMTools
 *
 * Licensed 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 jo.util.io;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.util.zip.CRC32;
import java.util.zip.CheckedInputStream;

import jo.util.StringUtil;

/**
 * @author Robert Barefoot team - version 1.0
 */
public class IOHelper {

    public static long crc32(final byte[] data) throws IOException {
        return crc32(new ByteArrayInputStream(data));
    }

    public static long crc32(final File path) throws IOException {
        return crc32(new FileInputStream(path));
    }

    public static long crc32(final InputStream in) throws IOException {
        final CheckedInputStream cis = new CheckedInputStream(in, new CRC32());
        final byte[] buf = new byte[128];
        while (cis.read(buf) > -1) {
        }
        return cis.getChecksum().getValue();
    }

    public static byte[] read(final File in) {
        try {
            return read(new FileInputStream(in));
        } catch (final FileNotFoundException ignored) {
            return null;
        }
    }

    public static byte[] read(final InputStream is) {
        ByteArrayOutputStream buffer = new ByteArrayOutputStream();
        try {
            final byte[] temp = new byte[4096];
            int read;
            while ((read = is.read(temp)) != -1) {
                buffer.write(temp, 0, read);
            }
        } catch (final IOException ignored) {
            try {
                buffer.close();
            } catch (final IOException ignored2) {
            }
            buffer = null;
        } finally {
            try {
                if (is != null) {
                    is.close();
                }
            } catch (final IOException ignored) {
            }
        }
        return buffer == null ? null : buffer.toByteArray();
    }

    public static byte[] read(final URL in) {
        try {
            return read(in.openStream());
        } catch (final IOException ignored) {
            return null;
        }
    }

    public static String readString(final File in) {
        return StringUtil.newStringUtf8(read(in));
    }

    public static String readString(final URL in) {
        return StringUtil.newStringUtf8(read(in));
    }

    public static void recursiveDelete(final File path,
            final boolean deleteParent) {
        if (!path.exists()) {
            return;
        }
        for (final File file : path.listFiles()) {
            if (file.isDirectory()) {
                recursiveDelete(file, true);
            } else {
                file.delete();
            }
        }
        if (deleteParent) {
            path.delete();
        }
    }

    public static void saveto(final InputStream in, final String outpath) {
        try {
            try (OutputStream out = new FileOutputStream(new File(outpath))) {
                final byte[] buf = new byte[1024];
                int len;
                while ((len = in.read(buf)) > 0) {
                    out.write(buf, 0, len);
                }
                in.close();
            }
        } catch (final IOException e) {
        }
    }

    public static void write(final InputStream in, final File out) {
        try {
            write(in, new FileOutputStream(out));
        } catch (final FileNotFoundException ignored) {
        }
    }

    public static void write(final InputStream in, final OutputStream out) {
        try {
            final byte[] buf = new byte[1024];
            int len;
            while ((len = in.read(buf)) > 0) {
                out.write(buf, 0, len);
            }
        } catch (final IOException ignored) {
        } finally {
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (final IOException ignored) {
            }
        }
    }

    public static void write(final String s, final File out) {
        final ByteArrayInputStream in = new ByteArrayInputStream(
                StringUtil.getBytesUtf8(s));
        write(in, out);
    }
}