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java.lang.Objectuk.ac.bristol.star.cdf.record.SimpleNioBuf
public class SimpleNioBuf
Buf implementation based on a single NIO ByteBuffer. This works fine as long as it doesn't need to be more than 2^31 bytes (2Gb), which is the maximum length of a ByteBuffer.
ByteBuffer
Constructor Summary | |
---|---|
SimpleNioBuf(java.nio.ByteBuffer byteBuf,
boolean isBit64,
boolean isBigendian)
Constructor. |
Method Summary | |
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java.io.InputStream |
createInputStream(long offset)
Returns an input stream consisting of all the bytes in this buf starting from the given offset. |
Buf |
fillNewBuf(long count,
java.io.InputStream in)
Creates a new Buf of a given length populated from a given input stream. |
long |
getLength()
Returns the extent of this buf in bytes. |
boolean |
isBigendian()
Determines the data encoding of this buf. |
boolean |
isBit64()
Determines the 64bit-ness of this buf. |
java.lang.String |
readAsciiString(Pointer ptr,
int nbyte)
Reads a fixed number of bytes interpreting them as ASCII characters and returns the result as a string. |
void |
readDataBytes(long offset,
int count,
byte[] array)
Reads a sequence of byte values from this buf into an array. |
void |
readDataDoubles(long offset,
int count,
double[] array)
Reads a sequence of double values from this buf into an array. |
void |
readDataFloats(long offset,
int count,
float[] array)
Reads a sequence of float values from this buf into an array. |
void |
readDataInts(long offset,
int count,
int[] array)
Reads a sequence of int values from this buf into an array. |
void |
readDataLongs(long offset,
int count,
long[] array)
Reads a sequence of long integer values from this buf into an array. |
void |
readDataShorts(long offset,
int count,
short[] array)
Reads a sequence of short values from this buf into an array. |
int |
readInt(Pointer ptr)
Reads a signed big-endian 4-byte integer from the pointer position. |
long |
readOffset(Pointer ptr)
Reads a file offset or size from the pointer position. |
int |
readUnsignedByte(Pointer ptr)
Reads a single byte from the pointer position, returning a value in the range 0..255. |
void |
setBit64(boolean isBit64)
Sets the 64bit-ness of this buf. |
void |
setEncoding(boolean bigend)
Sets the encoding for reading numeric values as performed by the readData* methods. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public SimpleNioBuf(java.nio.ByteBuffer byteBuf, boolean isBit64, boolean isBigendian)
byteBuf
- NIO byte buffer containing the byte dataisBit64
- 64bit-ness of this bufisBigendian
- true for big-endian, false for little-endianMethod Detail |
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public long getLength()
Buf
getLength
in interface Buf
public int readUnsignedByte(Pointer ptr)
Buf
readUnsignedByte
in interface Buf
ptr
- pointer
public int readInt(Pointer ptr)
Buf
readInt
in interface Buf
ptr
- pointer
public long readOffset(Pointer ptr)
Buf
Buf.isBit64()
.
Pointer position is moved on appropriately.
readOffset
in interface Buf
public java.lang.String readAsciiString(Pointer ptr, int nbyte)
Buf
nbyte
bytes have
been read, it is taken as the end of the string.
Pointer position is moved on appropriately.
readAsciiString
in interface Buf
ptr
- pointernbyte
- maximum number of bytes in string
public void setBit64(boolean isBit64)
Buf
readOffset
reads
4- or 8-byte values.
This method should be called before the readOffset
method is invoked.
setBit64
in interface Buf
isBit64
- true for 8-byte offsets, false for 4-byte offsetspublic void setEncoding(boolean bigend)
Buf
readData*
methods.
As currently specified, there are only two possibiliies, Big-Endian and Little-Endian. Interface and implementation would need to be reworked somewhat to accommodate the (presumably, rarely seen in this day and age) D_FLOAT and G_FLOAT encodings supported by the CDF standard.
This method should be called before any of the readData*
methods are invoked.
setEncoding
in interface Buf
bigend
- true for big-endian, false for little-endianpublic boolean isBigendian()
Buf
isBigendian
in interface Buf
public boolean isBit64()
Buf
readOffset
reads
4- or 8-byte values.
isBit64
in interface Buf
public void readDataBytes(long offset, int count, byte[] array)
Buf
readDataBytes
in interface Buf
offset
- position sequence start in this buffer in bytescount
- number of byte values to readarray
- array to receive values, starting at array element 0public void readDataShorts(long offset, int count, short[] array)
Buf
readDataShorts
in interface Buf
offset
- position sequence start in this buffer in bytescount
- number of short values to readarray
- array to receive values, starting at array element 0public void readDataInts(long offset, int count, int[] array)
Buf
readDataInts
in interface Buf
offset
- position sequence start in this buffer in bytescount
- number of int values to readarray
- array to receive values, starting at array element 0public void readDataLongs(long offset, int count, long[] array)
Buf
readDataLongs
in interface Buf
offset
- position sequence start in this buffer in bytescount
- number of long values to readarray
- array to receive values, starting at array element 0public void readDataFloats(long offset, int count, float[] array)
Buf
readDataFloats
in interface Buf
offset
- position sequence start in this buffer in bytescount
- number of float values to readarray
- array to receive values, starting at array element 0public void readDataDoubles(long offset, int count, double[] array)
Buf
readDataDoubles
in interface Buf
offset
- position sequence start in this buffer in bytescount
- number of double values to readarray
- array to receive values, starting at array element 0public java.io.InputStream createInputStream(long offset)
Buf
createInputStream
in interface Buf
offset
- position of first byte in buf that will appear in
the returned stream
public Buf fillNewBuf(long count, java.io.InputStream in) throws java.io.IOException
Buf
fillNewBuf
in interface Buf
count
- size of new buffer in bytesin
- input stream capable of supplying
(at least) count
bytes
count
filled with bytes
from in
java.io.IOException
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