ucar.unidata.io.RandomAccessFile.seek()方法的使用及代码示例

x33g5p2x  于2022-01-29 转载在 其他  
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本文整理了Java中ucar.unidata.io.RandomAccessFile.seek方法的一些代码示例，展示了RandomAccessFile.seek的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。RandomAccessFile.seek方法的具体详情如下：
包路径：ucar.unidata.io.RandomAccessFile
类名称：RandomAccessFile
方法名：seek

RandomAccessFile.seek介绍

[英]Set the position in the file for the next read or write.
[中]在文件中设置下一次读取或写入的位置。

代码示例

代码示例来源：origin: edu.ucar/cdm

/**
 * Constructor
 *
 * @param raf      the RandomAccessFile
 * @param startPos points to start of data in data section, in bytes
 * @throws IOException on read error
 */
public BitReader(RandomAccessFile raf, long startPos) throws IOException {
 this.raf = raf;
 this.startPos = startPos;
 raf.seek(startPos);
}

代码示例来源：origin: edu.ucar/netcdf

@Override
public StructureDataIterator reset() {
 bytesRead = 0;
 recno = 0;
 try {
  vinfo.raf.seek(0);
 } catch (IOException e) {
  throw new RuntimeException(e);
 }
 return this;
}

代码示例来源：origin: edu.ucar/cdm

@Override
public StructureDataIterator reset() {
 recno = 0;
 try {
  vinfo.rafile.seek(0);
 } catch (IOException e) {
  throw new RuntimeException(e);
 }
 return this;
}

代码示例来源：origin: edu.ucar/netcdf

static public boolean isValidFile(ucar.unidata.io.RandomAccessFile raf) throws IOException {
 // this is the first time we try to read the file - if there's a problem we get a IOException
 raf.seek(0);
 byte[] b = new byte[4];
 raf.read(b);
 for (int i = 0; i < 3; i++)
  if (b[i] != MAGIC[i])
   return false;
 return ((b[3] == 1) || (b[3] == 2));
}

代码示例来源：origin: edu.ucar/cdm

public boolean isValidFile( RandomAccessFile raf) throws IOException {
 try {
  raf.seek(0);
  String test = raf.readString(8);
  return test.equals( Level2VolumeScan.ARCHIVE2) || test.equals( Level2VolumeScan.AR2V0001) ||
      test.equals( Level2VolumeScan.AR2V0003)|| test.equals( Level2VolumeScan.AR2V0004) ||
      test.equals( Level2VolumeScan.AR2V0002) || test.equals( Level2VolumeScan.AR2V0006) ||
      test.equals( Level2VolumeScan.AR2V0007);
 } catch (IOException ioe) {
  return false;
 }
}

代码示例来源：origin: edu.ucar/cdm

void show(RandomAccessFile raf) throws IOException {
 raf.seek(filePos);
 byte[] b = raf.readBytes(40);
 System.out.println(new String(b, CDM.utf8Charset));
}

代码示例来源：origin: edu.ucar/cdm

void read() throws IOException {
 raf.seek(offset);
 byte[] buff = new byte[length];
 raf.readFully(buff);
 bb = ByteBuffer.wrap(buff);
}

代码示例来源：origin: Unidata/thredds

public final byte[] getOptiondsalSection(RandomAccessFile raf) throws
    IOException {
 if (!hasOptionalSection) return null;
 byte[] optionalSection = new byte[optionalSectionLen - 4];
 raf.seek(optionalSectionPos);
 int nRead = raf.read(optionalSection);
 if (nRead != optionalSection.length)
   log.warn("Error reading optional section -- expected " +
       optionalSection.length + " but read " + nRead);
 return optionalSection;
}

代码示例来源：origin: edu.ucar/cdm

void dump(String head, long filePos, int nbytes, boolean count) throws IOException {
 long savePos = raf.getFilePointer();
 if (filePos >= 0) raf.seek(filePos);
 byte[] mess = new byte[nbytes];
 raf.readFully(mess);
 printBytes(head, mess, nbytes, false, debugOut);
 raf.seek(savePos);
}

代码示例来源：origin: edu.ucar/cdm

private void skip(int nbytes) throws IOException {
 int pad = padding(nbytes);
 if (pad > 0)
  raf.seek(raf.getFilePointer() + pad);
}

代码示例来源：origin: edu.ucar/cdm

void read() throws IOException {
 raf.seek(offset);
 nelems = length / 4;
 elem_tag = new short[nelems];
 elem_ref = new short[nelems];
 for (int i = 0; i < nelems; i++) {
  elem_tag[i] = raf.readShort();
  elem_ref[i] = raf.readShort();
 }
}

代码示例来源：origin: Unidata/thredds

static boolean validatePIB(ucar.unidata.io.RandomAccessFile raf) throws IOException {
 int pos = 0;
 raf.seek(pos);
 // gini header process
 String pib = raf.readString(GINI_PIB_LEN + GINI_HED_LEN);
 return findWMOHeader(pib) != 0;
}

代码示例来源：origin: Unidata/thredds

public Grib1SectionBitMap(RandomAccessFile raf) throws IOException {
 startingPosition = raf.getFilePointer();
 // octets 1-3 (Length of section)
 int length = GribNumbers.int3(raf);
 raf.seek(startingPosition + length);
}

代码示例来源：origin: edu.ucar/cdm

HeapIdentifier(long address) throws IOException {
 // header information is in le byte order
 raf.order(RandomAccessFile.LITTLE_ENDIAN);
 raf.seek(address);
 nelems = raf.readInt();
 heapAddress = readOffset();
 index = raf.readInt();
 if (debugDetail)
  debugOut.println("   read HeapIdentifier address=" + address + this);
 if (debugHeap) dump("heapIdentifier", getFileOffset(address), 16, true);
}

代码示例来源：origin: edu.ucar/netcdf

Object readDoubleArray1D(int offsetInRecord) throws IOException {
 int elementSizeInBytes = 8;
 double[] array = new double[header.getNumDataRecords()];
 this.raf.seek(header.getRecordSizeInBytes() * header.getNumHeaderRecords() + offsetInRecord);
 for (int i = 0; i < header.getNumDataRecords(); i++) {
  this.raf.readDouble(array, i, 1);
  this.raf.skipBytes(header.getRecordSizeInBytes() - elementSizeInBytes);
 }
 return (array);
}

代码示例来源：origin: edu.ucar/cdm

Object readFloatArray1D(int offsetInRecord) throws IOException {
 int elementSizeInBytes = 4;
 float[] array = new float[header.getNumDataRecords()];
 this.raf.seek(header.getRecordSizeInBytes() * header.getNumHeaderRecords() + offsetInRecord);
 for (int i = 0; i < header.getNumDataRecords(); i++) {
  this.raf.readFloat(array, i, 1);
  this.raf.skipBytes(header.getRecordSizeInBytes() - elementSizeInBytes);
 }
 return (array);
}

代码示例来源：origin: Unidata/thredds

Object readFloatArray1D(int offsetInRecord) throws IOException {
 int elementSizeInBytes = 4;
 float[] array = new float[header.getNumDataRecords()];
 this.raf.seek(header.getRecordSizeInBytes() * header.getNumHeaderRecords() + offsetInRecord);
 for (int i = 0; i < header.getNumDataRecords(); i++) {
  this.raf.readFloat(array, i, 1);
  this.raf.skipBytes(header.getRecordSizeInBytes() - elementSizeInBytes);
 }
 return (array);
}

代码示例来源：origin: edu.ucar/netcdf

void read() throws IOException {
 raf.seek(offset);
 xdim = raf.readInt();
 ydim = raf.readInt();
 raf.skipBytes(2);
 nt_ref = raf.readShort();
 nelems = raf.readShort();
 interlace = raf.readShort();
 compress = raf.readShort();
 compress_ref = raf.readShort();
}

代码示例来源：origin: edu.ucar/cdm

void read() throws IOException {
 raf.seek(offset);
 xdim = raf.readInt();
 ydim = raf.readInt();
 raf.skipBytes(2);
 nt_ref = raf.readShort();
 nelems = raf.readShort();
 interlace = raf.readShort();
 compress = raf.readShort();
 compress_ref = raf.readShort();
}

代码示例来源：origin: Unidata/thredds

protected void read() throws IOException {
 raf.seek(offset);
 xdim = raf.readInt();
 ydim = raf.readInt();
 raf.skipBytes(2);
 nt_ref = raf.readShort();
 nelems = raf.readShort();
 interlace = raf.readShort();
 compress = raf.readShort();
 compress_ref = raf.readShort();
}

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