示例#1
0
 /**
  * 给定一个ip国家地区记录的偏移,返回一个IPLocation结构
  *
  * @param offset 国家记录的起始偏移
  * @return IPLocation对象
  */
 private IPLocation getIPLocation(long offset) {
   try {
     // 跳过4字节ip
     ipFile.seek(offset + 4);
     // 读取第一个字节判断是否标志字节
     byte b = ipFile.readByte();
     if (b == REDIRECT_MODE_1) {
       // 读取国家偏移
       long countryOffset = readLong3();
       // 跳转至偏移处
       ipFile.seek(countryOffset);
       // 再检查一次标志字节,因为这个时候这个地方仍然可能是个重定向
       b = ipFile.readByte();
       if (b == REDIRECT_MODE_2) {
         loc.setCountry(readString(readLong3()));
         ipFile.seek(countryOffset + 4);
       } else loc.setCountry(readString(countryOffset));
       // 读取地区标志
       loc.setArea(readArea(ipFile.getFilePointer()));
     } else if (b == REDIRECT_MODE_2) {
       loc.setCountry(readString(readLong3()));
       loc.setArea(readArea(offset + 8));
     } else {
       loc.setCountry(readString(ipFile.getFilePointer() - 1));
       loc.setArea(readArea(ipFile.getFilePointer()));
     }
     return loc;
   } catch (IOException e) {
     return null;
   }
 }
  /**
   * Read a file offset from the file PST Files have this tendency to store file offsets (pointers)
   * in 8 little endian bytes. Convert this to a long for seeking to.
   *
   * @param in handle for PST file
   * @param startOffset where to read the 8 bytes from
   * @return long representing the read location
   * @throws IOException
   */
  protected long extractLEFileOffset(long startOffset) throws IOException {
    long offset = 0;
    if (this.getPSTFileType() == PSTFile.PST_TYPE_ANSI) {
      in.seek(startOffset);
      byte[] temp = new byte[4];
      in.read(temp);
      offset |= temp[3] & 0xff;
      offset <<= 8;
      offset |= temp[2] & 0xff;
      offset <<= 8;
      offset |= temp[1] & 0xff;
      offset <<= 8;
      offset |= temp[0] & 0xff;
    } else {
      in.seek(startOffset);
      byte[] temp = new byte[8];
      in.read(temp);
      offset = temp[7] & 0xff;
      long tmpLongValue;
      for (int x = 6; x >= 0; x--) {
        offset = offset << 8;
        tmpLongValue = (long) temp[x] & 0xff;
        offset |= tmpLongValue;
      }
    }

    return offset;
  }
示例#3
0
  /**
   * Flush the file, computing the hash if necessary. After this method completes the hash obtained
   * in {@link #getHeader()} will be valid, but the file will not be closed. If you want the file to
   * be closed, use {@link #close()} instead, which invokes this method.
   *
   * <p><b>Warning</b>: Because of the hash computation this method can be costly! After calling
   * this the internal hash computation must be completely reset, so a subsequent write will cause
   * the hash to be updated from scratch. Use caution with this method. In fact, this is the reason
   * this method is not named {@code flush}.
   *
   * @throws IOException An error occurred writing the file.
   */
  public void finish() throws IOException {
    if (!_open) return;

    // Save the current position so we can restore it later.
    long pos = _backing.getFilePointer();

    // If the hash is not valid, compute it now.
    if (!_hashvalid) {
      // The hash is not valid. Complete the computation now and store
      // the resulting hash.
      _backing.seek(_backing.length());
      _updateDigest();
      _head.hash = _digest.digest();
      _hashvalid = true;

      // Reset the digest now to force it to be re-computed next time.
      // This must be done since we just "used up" the existing digest
      // instance.
      _resetDigest();
    }

    // Write the header to the backing store.
    _backing.seek(PicoStructure.HEAD_START);
    _backing.write(_head.putHeader());

    // Restore the file position.
    _backing.seek(pos);
  }
  /**
   * Stops the recording, and sets the state to STOPPED. In case of further usage, a reset is
   * needed. Also finalizes the wave file in case of uncompressed recording.
   */
  public void stop() {
    if (state == State.RECORDING) {
      if (rUncompressed) {
        audioRecorder.stop();

        try {
          randomAccessWriter.seek(4); // Write size to RIFF header
          randomAccessWriter.writeInt(Integer.reverseBytes(36 + payloadSize));

          randomAccessWriter.seek(40); // Write size to Subchunk2Size field
          randomAccessWriter.writeInt(Integer.reverseBytes(payloadSize));

          randomAccessWriter.close();
        } catch (IOException e) {
          Log.e(
              ExtAudioRecorder.class.getName(), "I/O exception occured while closing output file");
          state = State.ERROR;
        }
      } else {
        mediaRecorder.stop();
      }
      state = State.STOPPED;
    } else {
      Log.e(ExtAudioRecorder.class.getName(), "stop() called on illegal state");
      state = State.ERROR;
    }
  }
  /**
   * Delete an index entry in the idx file of the specified column.
   *
   * @param colname the column's name
   * @param idxPos index entry (line nr) to be deleted
   * @throws Exception
   */
  protected long deleteIndexEntry(String colname, int idxPos) throws Exception {
    long s = System.currentTimeMillis();
    if (!indexExists(colname)) {
      throw new Exception("No index created");
    }
    int pkindex = def.getColPosition(colname);
    if (pkindex == -1) {
      throw new Exception("Column does not exist");
    }
    Integer[] size = def.getSizes();
    int recordSize = idxFixedRecordLength() + size[pkindex];

    indexFile.seek(idxPos * recordSize);
    String sLine = indexFile.readLine();
    String[] parts = sLine.split("#");
    if (Integer.parseInt(parts[0].trim()) != idxPos) {
      throw new Exception("Index not found in index file");
    } else {
      indexFile.seek(idxPos * recordSize + 6);
      String flag = "D";
      indexFile.write(flag.toString().getBytes());
    }
    long e = System.currentTimeMillis();
    return e - s;
  }
示例#6
0
  /**
   * Search the pattern in mRAF, positioning the pointer at the beginning of the pattern.
   *
   * @param pattern
   * @return true if pattern was found, false if not found
   */
  private boolean searchInRAF(byte[] pattern) throws IOException {
    int viewSize = 4 * 1024;
    if (pattern.length > viewSize) return false;
    byte view[] =
        new byte[viewSize * 2]; // double the size for pattern appearing on single view boundary
    long rafPos = mRAF.getFilePointer();
    long viewBaseOffset = rafPos - (rafPos % viewSize);
    mRAF.seek(viewBaseOffset);
    int startOffset = (int) (rafPos - viewBaseOffset);

    boolean atFileEnd = false;
    int bytesRead;
    while (!atFileEnd && (bytesRead = mRAF.read(view, 0, view.length)) != -1) {
      if (bytesRead < pattern.length) break;
      atFileEnd =
          viewBaseOffset + bytesRead >= mFileSizeAtOpen; // don't read past end of file at open time
      if (atFileEnd) bytesRead = (int) (mFileSizeAtOpen - viewBaseOffset);
      int endOffset = Math.min(view.length, bytesRead);
      int matchAt = searchByteArray(view, startOffset, endOffset, pattern);
      if (matchAt != -1) {
        mRAF.seek(viewBaseOffset + matchAt);
        return true;
      }
      // bring in the next chunk of data from file
      viewBaseOffset += viewSize;
      mRAF.seek(viewBaseOffset);
      startOffset = 0;
    }

    mRAF.seek(rafPos); // move the pointer back to where we were before the failed search
    return false;
  }
示例#7
0
文件: FileL.java 项目: lzs0420/mytest
 /**
  * @param skip 跳过多少过字节进行插入数据
  * @param str 要插入的字符串
  * @param fileName 文件路径
  */
 public static void writeSkip(long skip, String str, String fileName) throws IOException {
   RandomAccessFile raf = null;
   try {
     raf = new RandomAccessFile(fileName, "rw");
     if (skip < 0 || skip > raf.length()) {
       System.out.println("跳过字节数无效");
       return;
     }
     byte[] b = str.getBytes();
     raf.setLength(raf.length() + b.length);
     for (long i = raf.length() - 1; i > b.length + skip - 1; i--) {
       raf.seek(i - b.length);
       byte temp = raf.readByte();
       raf.seek(i);
       raf.writeByte(temp);
     }
     raf.seek(skip);
     raf.write(b);
   } catch (Exception e) {
     throw new IOException(e);
   } finally {
     try {
       raf.close();
     } catch (IOException e) {
       throw e;
     }
   }
 }
 private String readLine() throws IOException {
   StringBuffer sb = new StringBuffer();
   char readChar;
   int ch;
   long pos = reader.getFilePointer();
   long length = file.length();
   if ((length < pos) || (length == pos && FileUtils.isFileNewer(file, accessTime))) {
     // file got rotated or truncated
     reader.close();
     reader = new RandomAccessFile(file, "r");
     position = 0;
     reader.seek(position);
     pos = 0;
   }
   accessTime = System.currentTimeMillis();
   while ((ch = reader.read()) != -1) {
     readChar = (char) ch;
     if (readChar != delimiter) {
       sb.append(readChar);
     } else {
       return sb.toString();
     }
   }
   reader.seek(pos);
   return null;
 }
  /**
   * Persists the bloom filter to disk.
   *
   * @throws IOException if I/O errors are encountered.
   */
  public void flush() throws IOException {
    cacheLock.writeLock().lock();
    try {
      checkIfOpen();
      if (cacheDirty && unflushedChanges != null && file != null) {
        final int offset = this.metadata.getHeaderLength();

        // it's actually a disk-backed filter with changes
        if (unflushedChangeCounter.get() >= seekThreshold) {
          file.seek(offset);
          file.write(cache); // can probably be made more efficient
          file.getFD().sync();
        } else {
          for (Map.Entry<Integer, Byte> change : unflushedChanges.entrySet()) {
            file.seek(change.getKey() + offset);
            file.write(change.getValue());
          }
        }
        cacheDirty = false;
        unflushedChanges.clear();
        unflushedChangeCounter.set(0);
      }
    } finally {
      cacheLock.writeLock().unlock();
    }
  }
  /**
   * Reads data from the given file into the given buffer, centered around the given file offset.
   * The first half of the buffer will be filled with data right before the given offset, while the
   * remainder of the buffer will contain data right after it (of course, containing the byte at the
   * given offset).
   *
   * @param stream The stream to read from
   * @param buffer The buffer to read data into
   * @param fileReferenceOffset The offset to start reading from in the stream.
   * @return The number of bytes reads, which could be less than the length of the input buffer if
   *     we can't read due to the beginning or the end of the file.
   * @throws IOException Thrown if the stream being used is invalid or inaccessible.
   */
  private static int readIntoBufferAroundReference(
      RandomAccessFile stream, byte[] buffer, long fileReferenceOffset) throws IOException {
    int length = buffer.length;
    // calculate start offset
    long fileStartOffset = fileReferenceOffset - length / 2;

    if (fileStartOffset < 0) {
      // offset is less than zero, adjust it, as well as the length we want to read
      length += (int) fileStartOffset;
      fileStartOffset = 0;
      if (length <= 0) {
        return 0;
      }
    }

    if (fileStartOffset + length > stream.length()) {
      // startOffset + length is beyond the end of the stream, adjust the length accordingly
      length = (int) (stream.length() - fileStartOffset);
      if (length <= 0) {
        return 0;
      }
    }

    // read the appropriate block of the file into the buffer, using symmetry with respect to its
    // midpoint
    // we always initiate a seek from the origin of the file.
    stream.seek(0);
    stream.seek(fileStartOffset);
    int bufferOffset = 0;
    while (bufferOffset < length) {
      int bytesRead = stream.read(buffer, bufferOffset, length - bufferOffset);
      bufferOffset += bytesRead;
    }
    return length;
  }
示例#11
0
  private void writeBlock(String path, int id, byte data[]) throws IOException {
    int writer_id = (id / FILE_BLK_SIZE);
    int writer_blk_id = (id % FILE_BLK_SIZE);

    // Backfill the writer array
    if (writer_id >= fFileRWList.size()) {
      // Add a new database file
      File f = new File(fDBDir, (writer_id + 1) + ".db");
      RandomAccessFile rw = new RandomAccessFile(f, "rw");
      fFileRWList.add(rw);
      fLastRwBlkLen = 0;
    }

    RandomAccessFile rw = fFileRWList.get(writer_id);

    // See if the file is long enough
    if (writer_blk_id >= fLastRwBlkLen) {
      byte tmp[] = new byte[BLK_SIZE];

      // Extend the length
      rw.seek(fLastRwBlkLen * BLK_SIZE);
      while (writer_blk_id >= fLastRwBlkLen) {
        rw.write(tmp);
        fLastRwBlkLen++;
      }
    }

    // Finally, seek to the block offset and write the block
    rw.seek(writer_blk_id * BLK_SIZE);
    rw.write(data);
  }
  @Override
  public void flushBefore(long pos) throws IOException {
    long readFromPos = flushedPos;
    super.flushBefore(pos);

    long bytesToRead = pos - readFromPos;
    raf.seek(readFromPos);

    if (bytesToRead < MAX_BUFFER_LEN) {
      byte buffer[] = new byte[(int) bytesToRead];
      raf.readFully(buffer);
      os.write(buffer);
    } else {
      byte buffer[] = new byte[MAX_BUFFER_LEN];
      while (bytesToRead > 0) {
        int count = (int) Math.min(MAX_BUFFER_LEN, bytesToRead);
        raf.readFully(buffer, 0, count);
        os.write(buffer, 0, count);
        bytesToRead -= count;
      }
    }

    os.flush();

    if (pos != streamPos) {
      raf.seek(streamPos); // Reset the position
    }
  }
  /**
   * appends image to given tiff file
   *
   * <p>if file is empty then this method write image to the file otherwise it will append the image
   * after previous image. <strong>Please note: This method supports only Big endian tiff
   * files</strong>
   *
   * @param img BufferedImage to append image
   * @param fileName The name of the file where the image will be written
   * @throws IOException if the file is unreadable
   */
  public void append(BufferedImage img, String fileName) throws IOException {
    File file = new File(fileName);
    if (file.exists() && file.length() > 0) {
      int endFile = (int) file.length();
      int padding = endFile % 8;
      RandomAccessFile rFile = new RandomAccessFile(fileName, "rw");
      rFile.seek(endFile);
      for (int i = 0; i < padding; i++) {
        rFile.write(0);
      }
      endFile += padding;
      alterLastIFDOffset(rFile, endFile);
      ByteArrayOutputStream bos = new ByteArrayOutputStream();
      byte[] data = getComponentBytes(img);
      boolean hasAlpha = data.length > (img.getWidth() * img.getHeight() * 3);
      if (compress) {
        data = performCompression(data, img.getWidth(), img.getHeight(), hasAlpha);
      }
      writeContents(bos, data, img.getWidth(), img.getHeight(), endFile, hasAlpha, compress);
      bos.close();
      data = bos.toByteArray();
      rFile.seek(endFile);
      rFile.write(data);
      rFile.close();

    } else {
      BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(fileName));
      createImage(img, out, compress);
      out.close();
    }
  }
示例#14
0
  public int bubbleSort() throws Exception {
    boolean swapped = true;
    int j = 0;
    int counter = 0;

    while (swapped) {
      swapped = false;
      j++;

      for (int i = 0; i < length() - j; i++) {
        file.seek(i * 4);
        int one = file.readInt();
        int two = file.readInt();

        if (one > two) {
          file.seek(i * 4);
          file.writeInt(two);
          file.writeInt(one);
          swapped = true;
          counter++;
        }
      }
    }
    return counter;
  }
示例#15
0
 public static void secureDelete(File file, Random random) throws IOException {
   // FIXME somebody who understands these things should have a look at this...
   if (!file.exists()) return;
   long size = file.length();
   if (size > 0) {
     RandomAccessFile raf = null;
     try {
       System.out.println(
           "Securely deleting " + file + " which is of length " + size + " bytes...");
       raf = new RandomAccessFile(file, "rw");
       raf.seek(0);
       long count;
       byte[] buf = new byte[4096];
       // First zero it out
       count = 0;
       while (count < size) {
         int written = (int) Math.min(buf.length, size - count);
         raf.write(buf, 0, written);
         count += written;
       }
       raf.getFD().sync();
       // Then ffffff it out
       for (int i = 0; i < buf.length; i++) buf[i] = (byte) 0xFF;
       raf.seek(0);
       count = 0;
       while (count < size) {
         int written = (int) Math.min(buf.length, size - count);
         raf.write(buf, 0, written);
         count += written;
       }
       raf.getFD().sync();
       // Then random data
       random.nextBytes(buf);
       raf.seek(0);
       count = 0;
       while (count < size) {
         int written = (int) Math.min(buf.length, size - count);
         raf.write(buf, 0, written);
         count += written;
       }
       raf.getFD().sync();
       raf.seek(0);
       // Then 0's again
       for (int i = 0; i < buf.length; i++) buf[i] = 0;
       count = 0;
       while (count < size) {
         int written = (int) Math.min(buf.length, size - count);
         raf.write(buf, 0, written);
         count += written;
       }
       raf.getFD().sync();
       raf.close();
       raf = null;
     } finally {
       Closer.close(raf);
     }
   }
   if ((!file.delete()) && file.exists()) throw new IOException("Unable to delete file " + file);
 }
 /**
  * Delete Tag from file
  *
  * @param raf
  * @param tempRaf
  * @throws IOException
  * @throws CannotWriteException
  */
 public void delete(RandomAccessFile raf, RandomAccessFile tempRaf)
     throws IOException, CannotWriteException {
   // This will save the file without any Comment or PictureData blocks
   FlacTag emptyTag = new FlacTag(null, new ArrayList<MetadataBlockDataPicture>());
   raf.seek(0);
   tempRaf.seek(0);
   write(emptyTag, raf, tempRaf);
 }
示例#17
0
 public long Seek(long offset, int seekOrigin) throws java.io.IOException {
   if (seekOrigin == STREAM_SEEK_SET) {
     _file.seek(offset);
   } else if (seekOrigin == STREAM_SEEK_CUR) {
     _file.seek(offset + _file.getFilePointer());
   }
   return _file.getFilePointer();
 }
示例#18
0
  private static RegionFile fixNegativeOffset(File regionFileFile) {
    FMLLog.log(
        Level.WARNING,
        "Region file " + regionFileFile + " is corrupted: negative offset. Attempting to fix.");
    try {
      Files.copy(
          regionFileFile,
          new File(regionFileFile.getParentFile(), regionFileFile.getName() + ".bak"));
    } catch (IOException e) {
      FMLLog.log(Level.SEVERE, e, "Failed to back up corrupt region file.");
    }
    try {
      RandomAccessFile dataFile = new RandomAccessFile(regionFileFile, "rw");
      try {
        int length;

        if (dataFile.length() < 4096L) {
          for (length = 0; length < 1024; ++length) {
            dataFile.writeInt(0);
          }

          for (length = 0; length < 1024; ++length) {
            dataFile.writeInt(0);
          }
        }

        if ((dataFile.length() & 4095L) != 0L) {
          for (length = 0; (long) length < (dataFile.length() & 4095L); ++length) {
            dataFile.write(0);
          }
        }

        length = (int) dataFile.length() / 4096;

        dataFile.seek(0L);

        for (int i = 0; i < 1024; ++i) {
          int offset = dataFile.readInt();

          if (offset != 0 && (offset >> 8) + (offset & 255) <= length) {
            for (int var5 = 0; var5 < (offset & 255); ++var5) {
              if ((offset >> 8) + var5 < 0) {
                dataFile.seek(dataFile.getFilePointer() - 4);
                dataFile.writeInt(0);
                break;
              }
            }
          }
        }
      } finally {
        dataFile.close();
      }
    } catch (Throwable t) {
      FMLLog.log(Level.SEVERE, t, "Failed to fix negative offset index in " + regionFileFile);
      throw UnsafeUtil.throwIgnoreChecked(t);
    }
    return new RegionFile(regionFileFile);
  }
示例#19
0
  /**
   * 使用切割的方式来替换给定文件中的一段数据
   *
   * @param file 给定的文件
   * @param off 要替换的一段数据的开始位置(包括)
   * @param length 要替换的一段数据的长度,大于1
   * @param newData 用来替换旧数据的新数据
   * @throws IOException
   * @throws LengthTooBigException (fileLength - (off + length)) > 31457280
   *     因为本方法采用的是先把需要替换的数据之后的数据读到内存中,然后将文件截短,最后把之前保存的数据写到文件中。因此读到内存中的数据不能太大
   */
  public static void replaceFileDataByCutWay(File file, long off, long length, byte[] newData)
      throws IOException, LengthTooBigException {

    // 获取文件长度
    long fileLength = file.length();

    // 验证数据合法性
    CheckingUtils.valiLongValue(off, 0, fileLength - 1, "off");
    CheckingUtils.valiLongValue(off + length, off + 1, fileLength, "length");
    CheckingUtils.valiObjectIsNull(newData, "newData");

    if (newData.length > 0) {
      // 计算需读到内存的数据的长度
      long keepDataLength = fileLength - (off + length);

      // 如果需要读到内存的数据长度为0
      if (keepDataLength == 0) {
        // 打开原文件
        RandomAccessFile raf = new RandomAccessFile(file, "rw");

        // 设置长度
        raf.setLength(off);

        // 将新数据写到末尾去
        raf.write(newData);

        // 关闭原文件
        raf.close();
      } else if (keepDataLength <= 31457280) {
        // 打开原文件
        RandomAccessFile raf = new RandomAccessFile(file, "rw");

        // 读取要保存的数据
        byte[] keepData = new byte[(int) keepDataLength];
        raf.seek(off + length);
        raf.read(keepData);

        // 将文件截掉合适的长度
        if (length != 0) {
          raf.setLength(fileLength - length);
        }

        // 写入新数据
        raf.seek(off);
        raf.write(newData);

        // 写入保存的数据
        raf.write(keepData);

        // 关闭原文件
        raf.close();
      } else {
        throw new LengthTooBigException(
            "Need to read the length of data of the memory more than 30720 ((fileLength - (off + length)) > 30720)");
      }
    }
  }
 private void writeIntoFile(int numOfDir, int numOfFile) {
   String dirString = String.valueOf(numOfDir) + ".dir";
   String fileString = String.valueOf(numOfFile) + ".dat";
   File dbDir = tableDir.toPath().resolve(dirString).normalize().toFile();
   if (!dbDir.isDirectory()) {
     dbDir.mkdir();
   }
   File dbFile = dbDir.toPath().resolve(fileString).normalize().toFile();
   if (list[numOfDir][numOfFile].isEmpty()) {
     dbFile.delete();
     if (dbDir.list().length == 0) {
       dbDir.delete();
     }
     return;
   }
   RandomAccessFile db;
   try {
     db = new RandomAccessFile(dbFile, "rw");
     try {
       db.setLength(0);
       Iterator<Map.Entry<String, String>> it;
       it = list[numOfDir][numOfFile].entrySet().iterator();
       long[] pointers = new long[list[numOfDir][numOfFile].size()];
       int counter = 0;
       while (it.hasNext()) {
         Map.Entry<String, String> m = (Map.Entry<String, String>) it.next();
         String key = m.getKey();
         db.write(key.getBytes("UTF-8"));
         db.write("\0".getBytes("UTF-8"));
         pointers[counter] = db.getFilePointer();
         db.seek(pointers[counter] + 4);
         ++counter;
       }
       it = list[numOfDir][numOfFile].entrySet().iterator();
       counter = 0;
       while (it.hasNext()) {
         Map.Entry<String, String> m = (Map.Entry<String, String>) it.next();
         String value = m.getValue();
         int curPointer = (int) db.getFilePointer();
         db.seek(pointers[counter]);
         db.writeInt(curPointer);
         db.seek(curPointer);
         db.write(value.getBytes("UTF-8"));
         ++counter;
       }
     } catch (Exception e) {
       db.close();
       throw new Exception(e);
     }
     db.close();
     if (dbDir.list().length == 0) {
       dbDir.delete();
     }
   } catch (Exception e) {
     throw new IllegalArgumentException();
   }
 }
  /**
   * Writes all necessary data for this entry.
   *
   * @since 1.1
   */
  public void closeEntry() throws IOException {
    if (entry == null) {
      return;
    }

    long realCrc = crc.getValue();
    crc.reset();

    if (entry.getMethod() == DEFLATED) {
      def.finish();
      while (!def.finished()) {
        deflate();
      }

      entry.setSize(def.getTotalIn());
      entry.setComprSize(def.getTotalOut());
      entry.setCrc(realCrc);

      def.reset();

      written += entry.getCompressedSize();
    } else if (raf == null) {
      if (entry.getCrc() != realCrc) {
        throw new SwcException.BadCRC(Long.toHexString(entry.getCrc()), Long.toHexString(realCrc));
      }

      if (entry.getSize() != written - dataStart) {
        throw new SwcException.BadZipSize(
            entry.getName(), entry.getSize() + "", (written - dataStart) + "");
      }
    } else {
        /* method is STORED and we used RandomAccessFile */
      long size = written - dataStart;

      entry.setSize(size);
      entry.setComprSize(size);
      entry.setCrc(realCrc);
    }

    // If random access output, write the local file header containing
    // the correct CRC and compressed/uncompressed sizes
    if (raf != null) {
      long save = raf.getFilePointer();

      raf.seek(localDataStart);
      writeOut((new ZipLong(entry.getCrc())).getBytes());
      writeOut((new ZipLong(entry.getCompressedSize())).getBytes());
      writeOut((new ZipLong(entry.getSize())).getBytes());
      raf.seek(save);
    }

    writeDataDescriptor(entry);
    entry = null;
  }
示例#22
0
文件: RAF.java 项目: Utlesh/code
  public static void main(String args[]) {
    try {
      String fname = "d:\\q.txt";
      String mode;
      // mode = "r";//r : file must exist
      mode = "rw"; // rw : file will be created or opened

      // open the file
      RandomAccessFile raf = new RandomAccessFile(fname, mode);

      /*
      //seek and write demo

         raf.seek(10);//position file r/w pointer at index 10 wrt BOF
         //a seek beyond file size causes file to grow upto the seek value
         raf.write(65);//raf.write('A');

      */

      // r/w java datatypes
      int i1, i2;
      float f1, f2;
      char c1, c2;
      String s1, s2;

      i1 = -10;
      f1 = 1234.5678F;
      c1 = 'q';
      s1 = "hello files";

      raf.seek(0); // reach BOF
      raf.writeInt(i1);
      raf.writeFloat(f1);
      raf.writeChar(c1);
      raf.writeUTF(s1);

      raf.seek(0); // reach BOF
      i2 = raf.readInt();
      f2 = raf.readFloat();
      c2 = raf.readChar();
      s2 = raf.readUTF();

      System.out.println(i2);
      System.out.println(f2);
      System.out.println(c2);
      System.out.println(s2);

      // close the file
      raf.close();
    } catch (IOException ex) {
      System.out.println(ex); // ex converts into ex.toString()
    }
  } // main
  /**
   * Search index file for a primary key value
   *
   * @param pkvalue the primary key value to search for
   * @param position [0] = index entry, [1] = table row
   * @throws Exception
   */
  public boolean searchIndex(String pkvalue, Positions pos) throws Exception {
    boolean found = false;
    boolean end = false;
    if (!indexExists(def.getPK())) {
      throw new Exception("No index created");
    }
    int pkindex = def.getColPosition(def.getPK());
    if (pkindex == -1) {
      throw new Exception("Primary key does not exist");
    }

    // calculate index = hash value
    String s_value = pkvalue.trim();
    int index = hash(s_value);

    Integer[] size = def.getSizes();
    int recordSize = idxFixedRecordLength() + size[pkindex];

    indexFile.seek(index * recordSize);
    String line = indexFile.readLine();

    if (line.substring(0, 1).equals(" ")) {
      // Empty record, end of search
      found = false;
      return found;
    }

    String[] parts = line.split("#");
    String s_part = parts[2].trim();
    if (s_part.equals(pkvalue) && !(parts[1].equals("D"))) {
      found = true;
      pos.index = Integer.parseInt(parts[0].trim());
      pos.table = Integer.parseInt(parts[3].trim());
    }
    while (!found && !end) {
      if (parts[4].substring(0, 4).equals("null")) {
        // end of linked list
        end = true;
        found = false;
      } else {
        index = Integer.parseInt(parts[4].trim());
        indexFile.seek(index * recordSize);
        line = indexFile.readLine();
        parts = line.split("#");
        if (parts[2].trim().equals(pkvalue) && !(parts[1].equals("D"))) {
          found = true;
          pos.index = Integer.parseInt(parts[0].trim());
          pos.table = Integer.parseInt(parts[3].trim());
        }
      }
    }
    return found;
  }
示例#24
0
  /**
   * Close the I/O stream and save any unsaved data.
   *
   * @exception IOException from library call
   */
  public void close() throws IOException {
    if (headerSize > 0) {
      // write number of rows, CRC
      outStream.seek(NUMROWS_OFFSET);
      outStream.writeLong(numRows);

      outStream.seek(headerSize - CRC_SIZE);
      outStream.writeInt(CRC);
    }

    outStream.close();
  }
示例#25
0
  /**
   * Closes the output file. MUST be called to have a correct stream.
   *
   * @exception IOException if there was an exception closing the Audio Writer.
   */
  public void close() throws IOException {
    /* update the total file length field from RIFF chunk */
    raf.seek(4);
    int fileLength = (int) raf.length() - 8;
    writeInt(raf, fileLength);

    /* update the data chunk length size */
    raf.seek(40);
    writeInt(raf, size);

    /* close the output file */
    raf.close();
  }
  public void spwanServer() throws Exception {
    OGlobalConfiguration.WAL_FUZZY_CHECKPOINT_INTERVAL.setValue(5);
    String buildDirectory = System.getProperty("buildDirectory", ".");
    buildDirectory += "/uniqueIndexCrashRestore";

    buildDir = new File(buildDirectory);
    if (buildDir.exists()) buildDir.delete();

    buildDir.mkdir();

    final File mutexFile = new File(buildDir, "mutex.ct");
    final RandomAccessFile mutex = new RandomAccessFile(mutexFile, "rw");
    mutex.seek(0);
    mutex.write(0);

    buildDirectory = buildDir.getCanonicalPath();
    buildDir = new File(buildDirectory);

    String javaExec = System.getProperty("java.home") + "/bin/java";
    javaExec = new File(javaExec).getCanonicalPath();

    System.setProperty("ORIENTDB_HOME", buildDirectory);

    ProcessBuilder processBuilder =
        new ProcessBuilder(
            javaExec,
            "-Xmx2048m",
            "-XX:MaxDirectMemorySize=512g",
            "-classpath",
            System.getProperty("java.class.path"),
            "-DORIENTDB_HOME=" + buildDirectory,
            "-DmutexFile=" + mutexFile.getCanonicalPath(),
            RemoteDBRunner.class.getName());
    processBuilder.inheritIO();

    serverProcess = processBuilder.start();

    System.out.println(
        IndexCrashRestoreSingleValueIT.class.getSimpleName() + ": Wait for server start");
    boolean started = false;
    do {
      Thread.sleep(5000);
      mutex.seek(0);
      started = mutex.read() == 1;
    } while (!started);

    mutex.close();
    mutexFile.delete();
    System.out.println(
        IndexCrashRestoreSingleValueIT.class.getSimpleName() + ": Server was started");
  }
示例#27
0
 /**
  * Provides wrapped access to the managed random access file. Use only this method, and not the
  * attribute reference directly. Calling this method will transparently ensure, that the returned
  * random access file references an open instance which is intelligently reset to the previous
  * file pointer position if necessary (lazy seeking)
  *
  * @return the managed random access file handle for internal use
  * @throws IOException
  */
 protected synchronized RandomAccessFile raf() throws IOException {
   if (isOpen == false) {
     reOpen();
     // restore previous file pointer position
     raf.seek(currentFilePointer);
   } else {
     // file was open; check if file pointer has been modified,
     // i.e. if a seek is necessary
     if (raf.getFilePointer() != currentFilePointer) {
       raf.seek(currentFilePointer);
     }
   }
   return raf;
 }
示例#28
0
 /**
  * 从给定的随机访问文件的给定的偏移量处开始读取给定个数的字节
  *
  * @param raf 给定的随机访问文件,读取完之后文件不会关闭,指针也会复原
  * @param off 给定的偏移量
  * @param length 最多要读取的字节个数
  * @return 一个字节数组
  * @throws IOException
  */
 public static byte[] readByte(RandomAccessFile raf, long off, int length) throws IOException {
   byte[] result;
   long lastPointer = raf.getFilePointer();
   raf.seek(off);
   byte[] bytes = new byte[length];
   int number = raf.read(bytes);
   raf.seek(lastPointer);
   if (number == length) {
     result = bytes;
   } else {
     result = new byte[number];
     System.arraycopy(bytes, 0, result, 0, number);
   }
   return result;
 }
示例#29
0
  /**
   * Parses the zip64 end of central directory record locator. The locator must be placed
   * immediately before the end of central directory (eocd) record starting at {@code eocdOffset}.
   *
   * <p>The position of the file cursor for {@code raf} after a call to this method is undefined an
   * callers must reposition it after each call to this method.
   */
  public static long parseZip64EocdRecordLocator(RandomAccessFile raf, long eocdOffset)
      throws IOException {
    // The spec stays curiously silent about whether a zip file with an EOCD record,
    // a zip64 locator and a zip64 eocd record is considered "empty". In our implementation,
    // we parse all records and read the counts from them instead of drawing any size or
    // layout based information.
    if (eocdOffset > ZIP64_LOCATOR_SIZE) {
      raf.seek(eocdOffset - ZIP64_LOCATOR_SIZE);
      if (Integer.reverseBytes(raf.readInt()) == ZIP64_LOCATOR_SIGNATURE) {
        byte[] zip64EocdLocator = new byte[ZIP64_LOCATOR_SIZE - 4];
        raf.readFully(zip64EocdLocator);
        ByteBuffer buf = ByteBuffer.wrap(zip64EocdLocator).order(ByteOrder.LITTLE_ENDIAN);

        final int diskWithCentralDir = buf.getInt();
        final long zip64EocdRecordOffset = buf.getLong();
        final int numDisks = buf.getInt();

        if (numDisks != 1 || diskWithCentralDir != 0) {
          throw new ZipException("Spanned archives not supported");
        }

        return zip64EocdRecordOffset;
      }
    }

    return -1;
  }
示例#30
0
 public void loadMetaData() throws IOException {
   pageFile.seek(offset);
   nextPageId = pageFile.readInt();
   currentFill = pageFile.readInt();
   bloomfilter = pageFile.readInt();
   type = pageFile.readByte();
 }