org.apache.poi.hssf.record

Class RecordInputStream

java.lang.Object

org.apache.poi.hssf.record.RecordInputStream

All Implemented Interfaces:

LittleEndianInput

public final class RecordInputStream
extends java.lang.Object
implements LittleEndianInput

Title: Record Input Stream Description: Wraps a stream and provides helper methods for the construction of records.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	RecordInputStream.LeftoverDataException For use in BiffViewer which may construct Records that don't completely read all available data.

Field Summary

Fields

Modifier and Type	Field and Description
static short	MAX_RECORD_DATA_SIZE Maximum size of a single record (minus the 4 byte header) without a continue

Constructor Summary

Constructors

Constructor and Description
RecordInputStream(java.io.InputStream in)
RecordInputStream(java.io.InputStream in, EncryptionInfo key, int initialOffset)

Method Summary

Modifier and Type	Method and Description
int	available()
int	getNextSid()
short	getSid()
boolean	hasNextRecord() Note - this method is expected to be called only when completed reading the current BIFF record.
void	mark(int readlimit) Mark the stream position - experimental function
void	nextRecord() Moves to the next record in the stream.
int	read(byte[] b, int off, int len)
byte[]	readAllContinuedRemainder() Deprecated. POI 2.0 Best to write a input stream that wraps this one where there is special sub record that may overlap continue records.
byte	readByte() Reads an 8 bit, signed value
java.lang.String	readCompressedUnicode(int requestedLength)
double	readDouble()
void	readFully(byte[] buf)
void	readFully(byte[] buf, int off, int len)
protected void	readFully(byte[] buf, int off, int len, boolean isPlain)
int	readInt() Reads a 32 bit, signed value
long	readLong() Reads a 64 bit, signed value
void	readPlain(byte[] buf, int off, int len) Usually acts the same as LittleEndianInput.readFully(byte[], int, int), but for an encrypted stream the raw (unencrypted) data is filled
byte[]	readRemainder() Returns the remaining bytes for the current record.
short	readShort() Reads a 16 bit, signed value
java.lang.String	readString()
int	readUByte() Reads an 8 bit, unsigned value
java.lang.String	readUnicodeLEString(int requestedLength) given a byte array of 16-bit unicode characters, compress to 8-bit and return a string { 0x16, 0x00 } -0x16
int	readUShort() Reads a 16 bit, unsigned value.
int	remaining() The remaining number of bytes in the current record.
void	reset() Resets the stream position to the previously marked position.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

MAX_RECORD_DATA_SIZE

public static final short MAX_RECORD_DATA_SIZE

Maximum size of a single record (minus the 4 byte header) without a continue

See Also:

Constant Field Values

Constructor Detail

RecordInputStream

public RecordInputStream(java.io.InputStream in)
                  throws RecordFormatException

Throws:

RecordFormatException

RecordInputStream

public RecordInputStream(java.io.InputStream in,
                         EncryptionInfo key,
                         int initialOffset)
                  throws RecordFormatException

Throws:

RecordFormatException

Method Detail

available

public int available()

Specified by:

available in interface LittleEndianInput

Returns:

the number of bytes available in the current BIFF record

See Also:

remaining()

read

public int read(byte[] b,
                int off,
                int len)

getSid

public short getSid()

hasNextRecord

public boolean hasNextRecord()
                      throws RecordInputStream.LeftoverDataException

Note - this method is expected to be called only when completed reading the current BIFF record.

Returns:

true, if there's another record in the stream

Throws:

RecordInputStream.LeftoverDataException - if this method is called before reaching the end of the current record.

nextRecord

public void nextRecord()
                throws RecordFormatException

Moves to the next record in the stream. Note: The auto continue flag is reset to true

Throws:

RecordFormatException

readByte

public byte readByte()

Reads an 8 bit, signed value

Specified by:

readByte in interface LittleEndianInput

readShort

public short readShort()

Reads a 16 bit, signed value

Specified by:

readShort in interface LittleEndianInput

readInt

public int readInt()

Reads a 32 bit, signed value

Specified by:

readInt in interface LittleEndianInput

readLong

public long readLong()

Reads a 64 bit, signed value

Specified by:

readLong in interface LittleEndianInput

readUByte

public int readUByte()

Reads an 8 bit, unsigned value

Specified by:

readUByte in interface LittleEndianInput

readUShort

public int readUShort()

Reads a 16 bit, unsigned value.

Specified by:

readUShort in interface LittleEndianInput

readDouble

public double readDouble()

Specified by:

readDouble in interface LittleEndianInput

readPlain

public void readPlain(byte[] buf,
                      int off,
                      int len)

Description copied from interface: LittleEndianInput

Usually acts the same as LittleEndianInput.readFully(byte[], int, int), but for an encrypted stream the raw (unencrypted) data is filled

Specified by:

readPlain in interface LittleEndianInput

Parameters:

buf - the byte array to receive the bytes

off - the start offset into the byte array

len - the amount of bytes to fill

readFully

public void readFully(byte[] buf)

Specified by:

readFully in interface LittleEndianInput

readFully

public void readFully(byte[] buf,
                      int off,
                      int len)

Specified by:

readFully in interface LittleEndianInput

readFully

protected void readFully(byte[] buf,
                         int off,
                         int len,
                         boolean isPlain)

readString

public java.lang.String readString()

readUnicodeLEString

public java.lang.String readUnicodeLEString(int requestedLength)

given a byte array of 16-bit unicode characters, compress to 8-bit and return a string { 0x16, 0x00 } -0x16

Parameters:

requestedLength - the length of the final string

Returns:

the converted string

Throws:

java.lang.IllegalArgumentException - if len is too large (i.e., there is not enough data in string to create a String of that length)

readCompressedUnicode

public java.lang.String readCompressedUnicode(int requestedLength)

readRemainder

public byte[] readRemainder()

Returns the remaining bytes for the current record.

Returns:

The remaining bytes of the current record.

readAllContinuedRemainder

@Deprecated
public byte[] readAllContinuedRemainder()

Deprecated. POI 2.0 Best to write a input stream that wraps this one where there is special sub record that may overlap continue records.

Reads all byte data for the current record, including any that overlaps into any following continue records.

Returns:

all byte data for the current record

remaining

public int remaining()

The remaining number of bytes in the current record.

Returns:

The number of bytes remaining in the current record

getNextSid

public int getNextSid()

Returns:

sid of next record. Can be called after hasNextRecord()

mark

@Internal
public void mark(int readlimit)

Mark the stream position - experimental function

Parameters:

readlimit - the read ahead limit

See Also:

InputStream.mark(int)

reset

@Internal
public void reset()
                     throws java.io.IOException

Resets the stream position to the previously marked position. Experimental function - this only works, when nextRecord() wasn't called in the meantime.

Throws:

java.io.IOException - if marking is not supported

See Also:

InputStream.reset()