Constructor and Description |
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WrapperBuf(Buf base)
Constructor.
|
Modifier and Type | Method and Description |
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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 bit64)
Sets the 64bit-ness of this buf.
|
void |
setEncoding(boolean isBigendian)
Sets the encoding for reading numeric values as performed by the
readData* methods. |
public WrapperBuf(Buf base)
base
- base bufpublic long getLength()
Buf
public int readUnsignedByte(Pointer ptr) throws java.io.IOException
Buf
readUnsignedByte
in interface Buf
ptr
- pointerjava.io.IOException
public int readInt(Pointer ptr) throws java.io.IOException
Buf
public long readOffset(Pointer ptr) throws java.io.IOException
Buf
Buf.isBit64()
.
Pointer position is moved on appropriately.readOffset
in interface Buf
java.io.IOException
public java.lang.String readAsciiString(Pointer ptr, int nbyte) throws java.io.IOException
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 stringjava.io.IOException
public void setBit64(boolean bit64)
Buf
readOffset
reads
4- or 8-byte values.
This method should be called before the readOffset
method is invoked.
public boolean isBit64()
Buf
readOffset
reads
4- or 8-byte values.public void setEncoding(boolean isBigendian)
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
isBigendian
- true for big-endian, false for little-endianpublic boolean isBigendian()
Buf
isBigendian
in interface Buf
public void readDataBytes(long offset, int count, byte[] array) throws java.io.IOException
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 0java.io.IOException
public void readDataShorts(long offset, int count, short[] array) throws java.io.IOException
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 0java.io.IOException
public void readDataInts(long offset, int count, int[] array) throws java.io.IOException
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 0java.io.IOException
public void readDataLongs(long offset, int count, long[] array) throws java.io.IOException
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 0java.io.IOException
public void readDataFloats(long offset, int count, float[] array) throws java.io.IOException
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 0java.io.IOException
public void readDataDoubles(long offset, int count, double[] array) throws java.io.IOException
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 0java.io.IOException
public java.io.InputStream createInputStream(long offset)
Buf
createInputStream
in interface Buf
offset
- position of first byte in buf that will appear in
the returned streampublic 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
bytescount
filled with bytes
from in
java.io.IOException