org.icepdf.core.util

Class Utils

java.lang.Object

org.icepdf.core.util.Utils

public class Utils
extends java.lang.Object

Author:

Mark Collette Date: 18-Feb-2005 Time: 3:53:40 PM

Constructor Summary

Constructors

Constructor and Description
Utils()

Method Summary

Modifier and Type	Method and Description
static java.lang.String	convertByteArrayToByteString(byte[] bytes) When converting between String chars and bytes, there's an implied encoding to be used, dependent on the context and platform.
static java.lang.String	convertByteArrayToHexString(byte[] buffer, boolean addSpaceSeparator)
static java.lang.String	convertByteArrayToHexString(byte[] buffer, boolean addSpaceSeparator, int addDelimiterEverNBytes, char delimiter)
static java.lang.String	convertByteArrayToHexString(byte[] buffer, int offset, int length, boolean addSpaceSeparator, int addDelimiterEverNBytes, char delimiter)
static byte[]	convertByteCharSequenceToByteArray(java.lang.CharSequence string) When converting between String chars and bytes, there's an implied encoding to be used, dependent on the context and platform.
static java.lang.String	convertStringObject(Library library, StringObject stringObject) Utility method for decrypting a String object found in a dictionary as a plaing text.
static java.lang.String	getContentAndReplaceInputStream(java.io.InputStream[] inArray, boolean convertToHex)
static java.lang.String	getContentFromSeekableInput(SeekableInput in, boolean convertToHex)
static int	numBytesToHoldBits(int numBits)
static void	printMemory(java.lang.String str)
static int	readIntWithVaryingBytesBE(java.io.InputStream in, int numBytes)
static long	readLongWithVaryingBytesBE(java.io.InputStream in, int numBytes)
static boolean	reflectGraphicsEnvironmentISHeadlessInstance(java.lang.Object graphicsEnvironment, boolean defaultReturnIfNoMethod) boolean java.awt.GraphicsEnvironment.isHeadless() does not exist in Java 1.3, since it was introduced in Java 1.4, so we use reflection to call it, if it exists.
static SeekableInput	replaceInputStreamWithSeekableInput(java.io.InputStream in)
static void	setIntIntoByteArrayBE(int value, byte[] buffer, int offset) Sets the value into the buffer, at the designated offset, using big-endian rules Callers is responsible to ensure that value will fit into buffer, starting at offset
static void	setShortIntoByteArrayBE(short value, byte[] buffer, int offset) Sets the value into the buffer, at the designated offset, using big-endian rules Callers is responsible to ensure that value will fit into buffer, starting at offset
static void	writeInteger(java.io.OutputStream in, int i) Write the given int as a 4 byte integer to the given outputStream.
static void	writeLong(java.io.OutputStream in, long i) Write the given int as a 8 byte long to the given outputStream.

Methods inherited from class java.lang.Object

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

Constructor Detail

Utils

public Utils()

Method Detail

setIntIntoByteArrayBE

public static void setIntIntoByteArrayBE(int value,
                                         byte[] buffer,
                                         int offset)

Sets the value into the buffer, at the designated offset, using big-endian rules Callers is responsible to ensure that value will fit into buffer, starting at offset

Parameters:

value - to be set into buffer

buffer - into which value is to be set

offset - into buffer which value is to be set

setShortIntoByteArrayBE

public static void setShortIntoByteArrayBE(short value,
                                           byte[] buffer,
                                           int offset)

Sets the value into the buffer, at the designated offset, using big-endian rules Callers is responsible to ensure that value will fit into buffer, starting at offset

Parameters:

value - to be set into buffer

buffer - into which value is to be set

offset - into buffer which value is to be set

readLongWithVaryingBytesBE

public static long readLongWithVaryingBytesBE(java.io.InputStream in,
                                              int numBytes)
                                       throws java.io.IOException

Parameters:

in - InputStream to read from

numBytes - number of bytes to read to make integral value from [0, 8]

Returns:

Integral value, which is composed of numBytes bytes, read using big-endian rules from in

Throws:

java.io.IOException

readIntWithVaryingBytesBE

public static int readIntWithVaryingBytesBE(java.io.InputStream in,
                                            int numBytes)
                                     throws java.io.IOException

Parameters:

in - InputStream to read from

numBytes - number of bytes to read to make integral value from [0, 4]

Returns:

Integral value, which is composed of numBytes bytes, read using big-endian rules from in

Throws:

java.io.IOException

writeInteger

public static void writeInteger(java.io.OutputStream in,
                                int i)
                         throws java.io.IOException

Write the given int as a 4 byte integer to the given outputStream.

Parameters:

in - stream to write byte data to.

i - integer to convert to bytes.

Throws:

java.io.IOException - write error.

writeLong

public static void writeLong(java.io.OutputStream in,
                             long i)
                      throws java.io.IOException

Write the given int as a 8 byte long to the given outputStream.

Parameters:

in - stream to write byte data to.

i - long to convert to bytes.

Throws:

java.io.IOException - write error.

convertByteArrayToHexString

public static java.lang.String convertByteArrayToHexString(byte[] buffer,
                                                           boolean addSpaceSeparator)

convertByteArrayToHexString

public static java.lang.String convertByteArrayToHexString(byte[] buffer,
                                                           boolean addSpaceSeparator,
                                                           int addDelimiterEverNBytes,
                                                           char delimiter)

convertByteArrayToHexString

public static java.lang.String convertByteArrayToHexString(byte[] buffer,
                                                           int offset,
                                                           int length,
                                                           boolean addSpaceSeparator,
                                                           int addDelimiterEverNBytes,
                                                           char delimiter)

reflectGraphicsEnvironmentISHeadlessInstance

public static boolean reflectGraphicsEnvironmentISHeadlessInstance(java.lang.Object graphicsEnvironment,
                                                                   boolean defaultReturnIfNoMethod)

boolean java.awt.GraphicsEnvironment.isHeadless() does not exist in Java 1.3, since it was introduced in Java 1.4, so we use reflection to call it, if it exists. In the event of not being able to call graphicsEnvironment.isHeadless(), instead of throwing an Exception, we simply return defaultReturnIfNoMethod

Parameters:

graphicsEnvironment - java.awt.GraphicsEnvironment to call isHeadless() on

defaultReturnIfNoMethod - Value to return if could not call graphicsEnvironment.isHeadless()

getContentAndReplaceInputStream

public static java.lang.String getContentAndReplaceInputStream(java.io.InputStream[] inArray,
                                                               boolean convertToHex)

getContentFromSeekableInput

public static java.lang.String getContentFromSeekableInput(SeekableInput in,
                                                           boolean convertToHex)

replaceInputStreamWithSeekableInput

public static SeekableInput replaceInputStreamWithSeekableInput(java.io.InputStream in)

printMemory

public static void printMemory(java.lang.String str)

numBytesToHoldBits

public static int numBytesToHoldBits(int numBits)

convertByteCharSequenceToByteArray

public static byte[] convertByteCharSequenceToByteArray(java.lang.CharSequence string)

When converting between String chars and bytes, there's an implied encoding to be used, dependent on the context and platform. If none is specified, then String(byte[]) will use the platform's default encoding. This method is for when encoding is not relevant, when the String simply holds byte values in each char.

See Also:

LiteralStringObject, HexStringObject, StandardEncryption

convertByteArrayToByteString

public static java.lang.String convertByteArrayToByteString(byte[] bytes)

When converting between String chars and bytes, there's an implied encoding to be used, dependent on the context and platform. If none is specified, then String(byte[]) will use the platform's default encoding. This method is for when encoding is not relevant, when the String simply holds byte values in each char.

See Also:

LiteralStringObject, HexStringObject, StandardEncryption

convertStringObject

public static java.lang.String convertStringObject(Library library,
                                                   StringObject stringObject)

Utility method for decrypting a String object found in a dictionary as a plaing text. The string can be encrypted as well as octal encoded, which is handle by this method.

Parameters:

library - docoument library used for encryption handling.

stringObject - string object to convert to string

Returns:

converted string.