mediautil.gen
Class BasicIo

java.lang.Object
  mediautil.gen.BasicIo

Direct Known Subclasses:

BasicJpegIo

public class BasicIo
extends Object

This is a utility class containing io and other general methods. This is mainly for use by other MediaUtil classes but may also be useful otherwise.

Field Summary

static String[]

FACTOR_ABVS

Constructor Summary

BasicIo()

Method Summary

static int	asInt(String str)
static String	asString(int i)
static void	bn2s(byte[] result, int offset, int value, int length) Converts the passed int value to bytes of Motorola Type (byte[0] is LSB)
static byte[]	bn2s(int value, int length) Converts the passed int value to bytes of Motorola Type (byte[0] is LSB)
static String	convertLength(long l)
static void	in2s(byte[] result, int offset, int value, int length) Converts the passed int value to bytes of Intel Type (byte[0] is MSB)
static boolean	isSignature(byte[] markerData, int offset, String signature) Checks if the bytes in markerData match the signature String.
static int	read(InputStream is, byte[] data) Definitely Reads data.length bytes unless End of Stream is reached.
static int	read(InputStream is, byte[] b, int off, int minBytes, int n) Attempts to read n bytes and definitely reads minBytes.
static int	s2n(byte[] buf, int offset, int length, boolean signed, boolean intel) Converts bytes to a number
static long	skip(InputStream is, long n) Definitely Skips n bytes unless End of Stream is reached.

Methods inherited from class java.lang.Object

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

Field Detail

FACTOR_ABVS

public static final String[] FACTOR_ABVS

Constructor Detail

BasicIo

public BasicIo()

Method Detail

s2n

public static int s2n(byte[] buf,
                      int offset,
                      int length,
                      boolean signed,
                      boolean intel)

Converts bytes to a number

Parameters:

buf - Bytes to convert

offset - Start offset of bytes

length - Length of bytes to convert

signed - If signed

intel - Specifies If data is of intel type (buf[0] is Most Significant Byte). If false then data is of Motorola Type (buf[0] is LSB)

in2s

public static void in2s(byte[] result,
                        int offset,
                        int value,
                        int length)

Converts the passed int value to bytes of Intel Type (byte[0] is MSB)

Parameters:

result - Output bytes

offset - Start offset to store the result

value - Value to convert

length - Length of bytes required

bn2s

public static void bn2s(byte[] result,
                        int offset,
                        int value,
                        int length)

Converts the passed int value to bytes of Motorola Type (byte[0] is LSB)

Parameters:

result - Output bytes

offset - Start offset to store the result

value - Value to convert

length - Length of bytes required

bn2s

public static byte[] bn2s(int value,
                          int length)

Converts the passed int value to bytes of Motorola Type (byte[0] is LSB)

Parameters:

value - Value to convert

length - Length of bytes required

Returns:

Output bytes stored in a new byte array of size length

isSignature

public static boolean isSignature(byte[] markerData,
                                  int offset,
                                  String signature)

Checks if the bytes in markerData match the signature String.

Parameters:

markerData - Marker Data

offset - Start offset of bytes

signature - Signature String. All the characters in this String are compared with the bytes starting from offset

Returns:

true if the signature matches, false otherwise

skip

public static long skip(InputStream is,
                        long n)
                 throws IOException

Definitely Skips n bytes unless End of Stream is reached. This is unlike the skip method of the InputStream which may skip less than the required number of bytes. This calls the InputStream's skip method repeatedly.

Parameters:

is - Input Stream

n - Number bytes to skip

Returns:

Number of bytes actually skipped this equals n unless End Of Stream is reached.

Throws:

IOException

read

public static int read(InputStream is,
                       byte[] b,
                       int off,
                       int minBytes,
                       int n)
                throws IOException

Attempts to read n bytes and definitely reads minBytes. This is unlike the read method of the InputStream which may read less than than the required number of bytes. This calls the InputStream's read method repeatedly. This method does not return -1 on End Of Stream.

Parameters:

is - Input Stream

b - Byte Array to read into

off - Offset to store data from

minBytes - Minimum bytes to read

n - Number of bytes to try to read

Returns:

Number of bytes actually read. This is >= minBytes and <= n unless End Of Stream is reached in which case it could be < minBytes. The return value is always >= 0.

Throws:

IOException - If n < 0 or if minBytes > n or if is.read(..) throws and Exception.

read

public static int read(InputStream is,
                       byte[] data)
                throws IOException

Definitely Reads data.length bytes unless End of Stream is reached. This is unlike the read method of the InputStream which may read less than the required number of bytes. This calls the InputStream's read method repeatedly. This method does not return -1 on End Of Stream.

Parameters:

is - Input Stream

data - Byte array to read to

Returns:

Number of bytes actually read which equals data.length unless End Of Stream is reached. The return value is always >= 0.

Throws:

IOException

convertLength

public static String convertLength(long l)

asInt

public static int asInt(String str)

asString

public static String asString(int i)