Example usage for java.io RandomAccessFile seek

Introduction

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

Prototype

public void seek(long pos) throws IOException

Source Link

Document

Sets the file-pointer offset, measured from the beginning of this file, at which the next read or write occurs.

Usage

From source file:org.telegram.ui.PassportActivity.java

private EncryptionResult createSecureDocument(String path) {
    File file = new File(path);
    int length = (int) file.length();
    byte[] b = new byte[length];
    RandomAccessFile f = null;
    try {/* www  .  j a v  a2 s.co m*/
        f = new RandomAccessFile(path, "rws");
        f.readFully(b);
    } catch (Exception ignore) {

    }
    EncryptionResult result = encryptData(b);
    try {
        f.seek(0);
        f.write(result.encryptedData);
        f.close();
    } catch (Exception ignore) {

    }
    return result;
}

From source file:com.peterbochs.PeterBochsDebugger.java

public String tail2(File file, int lines) {
    try {/*  w ww.  j  a v  a 2  s  .  c  om*/
        RandomAccessFile fileHandler = new RandomAccessFile(file, "r");
        long fileLength = file.length() - 1;
        StringBuilder sb = new StringBuilder();
        int line = 0;

        for (long filePointer = fileLength; filePointer != -1; filePointer--) {
            fileHandler.seek(filePointer);
            int readByte = fileHandler.readByte();

            if (readByte == 0xA) {
                line = line + 1;
                if (line == lines) {
                    if (filePointer == fileLength) {
                        continue;
                    } else {
                        break;
                    }
                }
            }
            sb.append((char) readByte);
        }

        sb.deleteCharAt(sb.length() - 1);
        String lastLine = sb.reverse().toString();
        return lastLine;
    } catch (Exception e) {
        return null;
    }
}

From source file:com.codename1.impl.android.AndroidImplementation.java

/**
 * @inheritDoc//from w w  w . j ava 2s .  c  o m
 */
public OutputStream openOutputStream(Object connection, int offset) throws IOException {
    String con = (String) connection;
    con = removeFilePrefix(con);
    RandomAccessFile rf = new RandomAccessFile(con, "rw");
    rf.seek(offset);
    FileOutputStream fc = new FileOutputStream(rf.getFD());
    BufferedOutputStream o = new BufferedOutputStream(fc, con);
    o.setConnection(rf);
    return o;
}