Package org.apache.pdfbox.util
Class Hex
- java.lang.Object
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- org.apache.pdfbox.util.Hex
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public final class Hex extends java.lang.Object
Utility functions for hex encoding.
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Constructor Summary
Constructors Modifier Constructor Description private
Hex()
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static byte[]
decodeBase64(java.lang.String base64Value)
Decode a base64 String.static byte[]
decodeHex(java.lang.String s)
Decodes a hex String into a byte array.static byte[]
getBytes(byte b)
Returns the bytes corresponding to the ASCII hex encoding of the given byte.static byte[]
getBytes(byte[] bytes)
Returns the bytes corresponding to the ASCII hex encoding of the given bytes.static char[]
getChars(short num)
Returns the characters corresponding to the ASCII hex encoding of the given short.static char[]
getCharsUTF16BE(java.lang.String text)
Takes the characters in the given string, convert it to bytes in UTF16-BE format and build a char array that corresponds to the ASCII hex encoding of the resulting bytes.private static int
getHighNibble(byte b)
Get the high nibble of the given byte.private static int
getLowNibble(byte b)
Get the low nibble of the given byte.static java.lang.String
getString(byte b)
Returns a hex string of the given byte.static java.lang.String
getString(byte[] bytes)
Returns a hex string of the given byte array.static void
writeHexByte(byte b, java.io.OutputStream output)
Writes the given byte as hex value to the given output stream.static void
writeHexBytes(byte[] bytes, java.io.OutputStream output)
Writes the given byte array as hex value to the given output stream.
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Method Detail
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getString
public static java.lang.String getString(byte b)
Returns a hex string of the given byte.
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getString
public static java.lang.String getString(byte[] bytes)
Returns a hex string of the given byte array.
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getBytes
public static byte[] getBytes(byte b)
Returns the bytes corresponding to the ASCII hex encoding of the given byte.
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getBytes
public static byte[] getBytes(byte[] bytes)
Returns the bytes corresponding to the ASCII hex encoding of the given bytes.
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getChars
public static char[] getChars(short num)
Returns the characters corresponding to the ASCII hex encoding of the given short.
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getCharsUTF16BE
public static char[] getCharsUTF16BE(java.lang.String text)
Takes the characters in the given string, convert it to bytes in UTF16-BE format and build a char array that corresponds to the ASCII hex encoding of the resulting bytes. Example:getCharsUTF16BE("ab") == new char[]{'0','0','6','1','0','0','6','2'}
- Parameters:
text
- The string to convert- Returns:
- The string converted to hex
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writeHexByte
public static void writeHexByte(byte b, java.io.OutputStream output) throws java.io.IOException
Writes the given byte as hex value to the given output stream.- Parameters:
b
- the byte to be writtenoutput
- the output stream to be written to- Throws:
java.io.IOException
- exception if anything went wrong
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writeHexBytes
public static void writeHexBytes(byte[] bytes, java.io.OutputStream output) throws java.io.IOException
Writes the given byte array as hex value to the given output stream.- Parameters:
bytes
- the byte array to be writtenoutput
- the output stream to be written to- Throws:
java.io.IOException
- exception if anything went wrong
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getHighNibble
private static int getHighNibble(byte b)
Get the high nibble of the given byte.- Parameters:
b
- the given byte- Returns:
- the high nibble
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getLowNibble
private static int getLowNibble(byte b)
Get the low nibble of the given byte.- Parameters:
b
- the given byte- Returns:
- the low nibble
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decodeBase64
public static byte[] decodeBase64(java.lang.String base64Value)
Decode a base64 String.- Parameters:
base64Value
- a base64 encoded String.- Returns:
- the decoded String as a byte array.
- Throws:
java.lang.IllegalArgumentException
- if this isn't a base64 encoded string.
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decodeHex
public static byte[] decodeHex(java.lang.String s) throws java.io.IOException
Decodes a hex String into a byte array.- Parameters:
s
- A String with ASCII hex.- Returns:
- decoded byte array.
- Throws:
java.io.IOException
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