Example usage for java.io RandomAccessFile readFully

Introduction

In this page you can find the example usage for java.io RandomAccessFile readFully.

Prototype

public final void readFully(byte b[]) throws IOException 

Source Link

Document

Reads b.length bytes from this file into the byte array, starting at the current file pointer.

Usage

From source file:Main.java

public static byte[] readFromFile(String fileName, int offset, int len) {
    if (fileName == null) {
        return null;
    }//w w  w.  j  a  v  a  2 s .co m

    File file = new File(fileName);
    if (!file.exists()) {
        //WLog.i(FileUtils.class, "readFromFile: file not found");
        return null;
    }

    if (len == -1) {
        len = (int) file.length();
    }

    if (offset < 0) {
        //WLog.e(FileUtils.class, "readFromFile invalid offset:" + offset);
        return null;
    }
    if (len <= 0) {
        //WLog.e(FileUtils.class, "readFromFile invalid len:" + len);
        return null;
    }
    if (offset + len > (int) file.length()) {
        //WLog.e(FileUtils.class, "readFromFile invalid file len:" + file.length());
        return null;
    }

    byte[] b = null;
    try {
        RandomAccessFile in = new RandomAccessFile(fileName, "r");
        b = new byte[len];
        in.seek(offset);
        in.readFully(b);
        in.close();

    } catch (Exception e) {
        // WLog.e(FileUtils.class, "readFromFile : errMsg = " + e.getMessage());
        e.printStackTrace();
    }
    return b;
}

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From source file:Main.java

public static byte[] readFromFile(String fileName, int offset, int len) {
    if (fileName == null) {
        return null;
    }//  w  w  w  .  j av  a 2s.  com

    File file = new File(fileName);
    if (!file.exists()) {
        Log.i(TAG, "readFromFile: file not found");
        return null;
    }

    if (len == -1) {
        len = (int) file.length();
    }

    Log.d(TAG, "readFromFile : offset = " + offset + " len = " + len + " offset + len = " + (offset + len));

    if (offset < 0) {
        Log.e(TAG, "readFromFile invalid offset:" + offset);
        return null;
    }
    if (len <= 0) {
        Log.e(TAG, "readFromFile invalid len:" + len);
        return null;
    }
    if (offset + len > (int) file.length()) {
        Log.e(TAG, "readFromFile invalid file len:" + file.length());
        return null;
    }

    byte[] b = null;
    try {
        RandomAccessFile in = new RandomAccessFile(fileName, "r");
        b = new byte[len];
        in.seek(offset);
        in.readFully(b);
        in.close();

    } catch (Exception e) {
        Log.e(TAG, "readFromFile : errMsg = " + e.getMessage());
        e.printStackTrace();
    }
    return b;
}

---

From source file:Main.java

public static byte[] readFromFile(String fileName, int offset, int len) {
    if (fileName == null) {
        return null;
    }//from   w  w w.  j a  va2  s .c  o m

    File file = new File(fileName);
    if (!file.exists()) {
        Log.i(TAG, "readFromFile: file not found");
        return null;
    }

    if (len == -1) {
        len = (int) file.length();
    }

    Log.d(TAG, "readFromFile : offset = " + offset + " len = " + len + " offset + len = " + (offset + len));

    if (offset < 0) {
        Log.e(TAG, "readFromFile invalid offset:" + offset);
        return null;
    }
    if (len <= 0) {
        Log.e(TAG, "readFromFile invalid len:" + len);
        return null;
    }
    if (offset + len > (int) file.length()) {
        Log.e(TAG, "readFromFile invalid file len:" + file.length());
        return null;
    }

    byte[] b = null;
    try {
        RandomAccessFile in = new RandomAccessFile(fileName, "r");
        b = new byte[len]; //
        in.seek(offset);
        in.readFully(b);
        in.close();

    } catch (Exception e) {
        Log.e(TAG, "readFromFile : errMsg = " + e.getMessage());
        e.printStackTrace();
    }
    return b;
}

---

From source file:org.apache.hadoop.hdfs.server.namenode.FSImageUtil.java

public static boolean checkFileFormat(RandomAccessFile file) throws IOException {
    if (file.length() < Loader.MINIMUM_FILE_LENGTH)
        return false;

    byte[] magic = new byte[MAGIC_HEADER.length];
    file.readFully(magic);
    if (!Arrays.equals(MAGIC_HEADER, magic))
        return false;

    return true;// www . ja  va 2  s.com
}

---

From source file:com.parse.ParseKeyValueCache.java

static String loadFromKeyValueCache(final String key, final long maxAgeMilliseconds) {
    synchronized (MUTEX_IO) {
        File file = getKeyValueCacheFile(key);
        if (file == null) {
            return null;
        }/* www.ja  v a 2  s  .com*/

        Date now = new Date();
        long oldestAcceptableAge = Math.max(0, now.getTime() - maxAgeMilliseconds);
        if (getKeyValueCacheAge(file) < oldestAcceptableAge) {
            return null;
        }

        // Update mtime to make the LRU work
        file.setLastModified(now.getTime());

        try {
            RandomAccessFile f = new RandomAccessFile(file, "r");
            byte[] bytes = new byte[(int) f.length()];
            f.readFully(bytes);
            f.close();
            return new String(bytes, "UTF-8");
        } catch (IOException e) {
            PLog.e(TAG, "error reading from cache", e);
            return null;
        }
    }
}

---

From source file:Main.java

public static byte[] readFile(File file) throws IOException {
    // Open file/*  w ww.  j  a  v a  2s  .  c  om*/
    RandomAccessFile f = new RandomAccessFile(file, "r");
    try {
        // Get and check length
        long longlength = f.length();
        int length = (int) longlength;
        if (length != longlength)
            throw new IOException("File size >= 2 GB");
        // Read file and return data
        byte[] data = new byte[length];
        f.readFully(data);
        return data;
    } finally {
        f.close();
    }
}

---

From source file:eu.delving.metadata.Hasher.java

public static String quickHash(File file) throws IOException {
    Hasher hasher = new Hasher();
    RandomAccessFile raf = new RandomAccessFile(file, "r");
    byte[] chunk = new byte[QUICK_SAMPLE_SIZE];
    long length = raf.length() - chunk.length;
    long step = length / QUICK_SAMPLES;
    for (int walk = 0; walk < QUICK_SAMPLES; walk++) {
        raf.seek(step * walk);/*from   ww  w. j  av  a  2 s .com*/
        raf.readFully(chunk);
        hasher.update(chunk, chunk.length);
    }
    raf.close();
    return hasher.getHashString().substring(4, 14);
}

---

From source file:com.shopgun.android.sdk.utils.ExternalClientIdStore.java

public static String getCid(ShopGun sgn) {

    // First try SharedPrefs
    String cid = sgn.getSettings().getClientId();
    if (cid != null) {
        return cid;
    }/*  ww  w  . j a va 2s. co  m*/

    // Then try external storage
    File cidFile = getCidFile(sgn.getContext());
    if (cidFile == null) {
        return null;
    }

    RandomAccessFile f = null;
    try {
        f = new RandomAccessFile(cidFile, "r");
        // Get and check length
        long longlength = f.length();
        int length = (int) longlength;
        if (length != longlength)
            return null;
        // Read file and return data
        byte[] data = new byte[length];
        f.readFully(data);
        return new String(data);
    } catch (Exception e) {
        // Ignore
    } finally {
        try {
            f.close();
        } catch (Exception e) {
            // Ignore
        }

        // Cleanup the cid file, we won't need it any more
        deleteCidFile(sgn.getContext());
    }

    return null;
}

---

From source file:com.geekandroid.sdk.pay.utils.Util.java

public static byte[] readFromFile(String fileName, int offset, int len) {
    if (fileName == null) {
        return null;
    }/* w ww. jav a 2  s .  c o m*/

    File file = new File(fileName);
    if (!file.exists()) {
        Log.i(TAG, "readFromFile: file not found");
        return null;
    }

    if (len == -1) {
        len = (int) file.length();
    }

    Log.d(TAG, "readFromFile : offset = " + offset + " len = " + len + " offset + len = " + (offset + len));

    if (offset < 0) {
        Log.e(TAG, "readFromFile invalid offset:" + offset);
        return null;
    }
    if (len <= 0) {
        Log.e(TAG, "readFromFile invalid len:" + len);
        return null;
    }
    if (offset + len > (int) file.length()) {
        Log.e(TAG, "readFromFile invalid file len:" + file.length());
        return null;
    }

    byte[] b = null;
    try {
        RandomAccessFile in = new RandomAccessFile(fileName, "r");
        b = new byte[len]; // ??
        in.seek(offset);
        in.readFully(b);
        in.close();

    } catch (Exception e) {
        Log.e(TAG, "readFromFile : errMsg = " + e.getMessage());
        e.printStackTrace();
    }
    return b;
}

---

From source file:org.apache.hadoop.hdfs.server.namenode.FSImageUtil.java

public static FileSummary loadSummary(RandomAccessFile file) throws IOException {
    final int FILE_LENGTH_FIELD_SIZE = 4;
    long fileLength = file.length();
    file.seek(fileLength - FILE_LENGTH_FIELD_SIZE);
    int summaryLength = file.readInt();

    if (summaryLength <= 0) {
        throw new IOException("Negative length of the file");
    }//from w  w  w. jav  a2 s .  c om
    file.seek(fileLength - FILE_LENGTH_FIELD_SIZE - summaryLength);

    byte[] summaryBytes = new byte[summaryLength];
    file.readFully(summaryBytes);

    FileSummary summary = FileSummary.parseDelimitedFrom(new ByteArrayInputStream(summaryBytes));
    if (summary.getOndiskVersion() != FILE_VERSION) {
        throw new IOException("Unsupported file version " + summary.getOndiskVersion());
    }

    if (!NameNodeLayoutVersion.supports(Feature.PROTOBUF_FORMAT, summary.getLayoutVersion())) {
        throw new IOException("Unsupported layout version " + summary.getLayoutVersion());
    }
    return summary;
}

---

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