ByteUtil

java.lang.Object
- com.healthmarketscience.jackcess.impl.ByteUtil

public final class ByteUtil
extends java.lang.Object

Byte manipulation and display utilities

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class ByteUtil.ByteStream
Utility byte stream similar to ByteArrayOutputStream but with extended accessibility to the bytes.

Nested Classes
Modifier and Type	Class and Description
`static class`	`ByteUtil.ByteStream` Utility byte stream similar to ByteArrayOutputStream but with extended accessibility to the bytes.

Field Summary

Fields
Modifier and Type Field and Description

private static java.lang.String[] HEX_CHARS

private static int NUM_BYTES_PER_BLOCK

private static int NUM_BYTES_PER_LINE

Fields
Modifier and Type	Field and Description
`private static java.lang.String[]`	`HEX_CHARS`
`private static int`	`NUM_BYTES_PER_BLOCK`
`private static int`	`NUM_BYTES_PER_LINE`

Constructor Summary

Constructors
Modifier Constructor and Description

private ByteUtil()

Constructors
Modifier	Constructor and Description
`private`	`ByteUtil()`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static int`	`asUnsignedByte(byte b)`
`static int`	`asUnsignedShort(short s)`
`static void`	`clearRange(java.nio.ByteBuffer buffer, int start, int end)` Sets all bits in the given byte range to 0.
`static void`	`clearRemaining(java.nio.ByteBuffer buffer)` Sets all bits in the given remaining byte range to 0.
`static void`	`closeQuietly(java.io.Closeable c)` Closes the given Closeable if non-null, swallows any IOExceptions.
`static byte[]`	`concat(byte[] b1, byte[] b2)` Concatenates and returns the given byte arrays.
`static void`	`copy(java.io.InputStream in, java.io.OutputStream out)` Copies the given InputStream to the given OutputStream.
`static byte[]`	`copyOf(byte[] arr, int newLength)` Returns a copy of the given array of the given length.
`static byte[]`	`copyOf(byte[] arr, int offset, int newLength)` Returns a copy of the given array of the given length starting at the given position.
`static byte[]`	`copyOf(byte[] arr, int offset, int newLength, int dstOffset)` Returns a copy of the given array of the given length starting at the given position.
`static void`	`fillRange(java.nio.ByteBuffer buffer, int start, int end)` Sets all bits in the given byte range to 1.
`static int`	`findRange(java.nio.ByteBuffer buffer, int start, byte[] pattern)` Searches for a pattern of bytes in the given buffer starting at the given offset.
`static int`	`forward(java.nio.ByteBuffer buffer, int count)` Moves the position of the given buffer the given count from the current position.
`static int`	`get3ByteInt(java.nio.ByteBuffer buffer)` Read a 3 byte int from a buffer
`static int`	`get3ByteInt(java.nio.ByteBuffer buffer, java.nio.ByteOrder order)` Read a 3 byte int from a buffer
`static int`	`get3ByteInt(java.nio.ByteBuffer buffer, int offset)` Read a 3 byte int from a buffer
`static int`	`get3ByteInt(java.nio.ByteBuffer buffer, int offset, java.nio.ByteOrder order)` Read a 3 byte int from a buffer
`static byte[]`	`getBytes(java.nio.ByteBuffer buffer, int len)` Reads an array of bytes from the given buffer
`static byte[]`	`getBytes(java.nio.ByteBuffer buffer, int offset, int len)` Reads an array of bytes from the given buffer at the given offset
`static int`	`getInt(java.nio.ByteBuffer buffer, java.nio.ByteOrder order)`
`static int`	`getInt(java.nio.ByteBuffer buffer, int offset, java.nio.ByteOrder order)`
`static int`	`getUnsignedByte(java.nio.ByteBuffer buffer)` Read an unsigned byte from a buffer
`static int`	`getUnsignedByte(java.nio.ByteBuffer buffer, int offset)` Read an unsigned byte from a buffer
`static int`	`getUnsignedShort(java.nio.ByteBuffer buffer)` Read an unsigned short from a buffer
`static int`	`getUnsignedShort(java.nio.ByteBuffer buffer, int offset)` Read an unsigned short from a buffer
`static int`	`getUnsignedVarInt(java.nio.ByteBuffer buffer, int numBytes)` Read an unsigned variable length int from a buffer
`static int`	`getUnsignedVarInt(java.nio.ByteBuffer buffer, int offset, int numBytes)` Read an unsigned variable length int from a buffer
`static boolean`	`matchesRange(java.nio.ByteBuffer buffer, int start, byte[] pattern)` Matches a pattern of bytes against the given buffer starting at the given offset.
`static void`	`put3ByteInt(java.nio.ByteBuffer buffer, int val)` Put an integer into the given buffer at the given offset as a 3-byte integer.
`static void`	`put3ByteInt(java.nio.ByteBuffer buffer, int val, java.nio.ByteOrder order)` Put an integer into the given buffer at the given offset as a 3-byte integer.
`static void`	`put3ByteInt(java.nio.ByteBuffer buffer, int val, int offset, java.nio.ByteOrder order)` Put an integer into the given buffer at the given offset as a 3-byte integer.
`static void`	`putInt(java.nio.ByteBuffer buffer, int val, java.nio.ByteOrder order)` Writes an int at the current position in the given buffer, using the given ByteOrder
`static void`	`putInt(java.nio.ByteBuffer buffer, int val, int offset, java.nio.ByteOrder order)` Writes an int at the given position in the given buffer, using the given ByteOrder
`static void`	`putRange(java.nio.ByteBuffer buffer, int start, int end, byte b)` Sets all bytes in the given byte range to the given byte value.
`static void`	`swap2Bytes(byte[] bytes, int offset)` Swaps the 2 bytes (changes endianness) of the bytes at the given offset.
`static void`	`swap4Bytes(byte[] bytes, int offset)` Swaps the 4 bytes (changes endianness) of the bytes at the given offset.
`static void`	`swap8Bytes(byte[] bytes, int offset)` Swaps the 8 bytes (changes endianness) of the bytes at the given offset.
`private static void`	`swapBytesAt(byte[] bytes, int p1, int p2)` Swaps the bytes at the given positions.
`static void`	`toHexFile(java.lang.String fileName, java.nio.ByteBuffer buffer, int offset, int size)` Writes a chunk of data to a file in pretty printed hexidecimal.
`static java.lang.String`	`toHexString(byte[] array)` Convert a byte array to a hexadecimal string for display
`static java.lang.String`	`toHexString(java.nio.ByteBuffer buffer, int size)` Convert a byte buffer to a hexadecimal string for display
`static java.lang.String`	`toHexString(java.nio.ByteBuffer buffer, int offset, int size)` Convert a byte buffer to a hexadecimal string for display
`static java.lang.String`	`toHexString(java.nio.ByteBuffer buffer, int offset, int size, boolean formatted)` Convert a byte buffer to a hexadecimal string for display
`static java.lang.String`	`toHexString(DatabaseImpl db, int pageNumber, int size)` Convert the given number of bytes from the given database page to a hexidecimal string for display.
`static void`	`writeHexString(java.nio.ByteBuffer buffer, java.lang.String hexStr)` Writes a sequence of hexidecimal values into the given buffer, where every two characters represent one byte value.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - HEX_CHARS
```
private static final java.lang.String[] HEX_CHARS
```
  - NUM_BYTES_PER_BLOCK
```
private static final int NUM_BYTES_PER_BLOCK
```
    See Also:
    
    Constant Field Values
  - NUM_BYTES_PER_LINE
```
private static final int NUM_BYTES_PER_LINE
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - ByteUtil
```
private ByteUtil()
```
- Method Detail
  - put3ByteInt
```
public static void put3ByteInt(java.nio.ByteBuffer buffer,
                               int val)
```
    Put an integer into the given buffer at the given offset as a 3-byte integer.
    
    Parameters:
    
    buffer - buffer into which to insert the int
    
    val - Int to convert
  - put3ByteInt
```
public static void put3ByteInt(java.nio.ByteBuffer buffer,
                               int val,
                               java.nio.ByteOrder order)
```
    Put an integer into the given buffer at the given offset as a 3-byte integer.
    
    Parameters:
    
    buffer - buffer into which to insert the int
    
    val - Int to convert
    
    order - the order to insert the bytes of the int
  - put3ByteInt
```
public static void put3ByteInt(java.nio.ByteBuffer buffer,
                               int val,
                               int offset,
                               java.nio.ByteOrder order)
```
    Put an integer into the given buffer at the given offset as a 3-byte integer.
    
    Parameters:
    
    buffer - buffer into which to insert the int
    
    val - Int to convert
    
    offset - offset at which to insert the int
    
    order - the order to insert the bytes of the int
  - get3ByteInt
```
public static int get3ByteInt(java.nio.ByteBuffer buffer)
```
    Read a 3 byte int from a buffer
    
    Parameters:
    
    buffer - Buffer containing the bytes
    
    Returns:
    
    The int
  - get3ByteInt
```
public static int get3ByteInt(java.nio.ByteBuffer buffer,
                              java.nio.ByteOrder order)
```
    Read a 3 byte int from a buffer
    
    Parameters:
    
    buffer - Buffer containing the bytes
    
    order - the order of the bytes of the int
    
    Returns:
    
    The int
  - get3ByteInt
```
public static int get3ByteInt(java.nio.ByteBuffer buffer,
                              int offset)
```
    Read a 3 byte int from a buffer
    
    Parameters:
    
    buffer - Buffer containing the bytes
    
    offset - Offset at which to start reading the int
    
    Returns:
    
    The int
  - get3ByteInt
```
public static int get3ByteInt(java.nio.ByteBuffer buffer,
                              int offset,
                              java.nio.ByteOrder order)
```
    Read a 3 byte int from a buffer
    
    Parameters:
    
    buffer - Buffer containing the bytes
    
    offset - Offset at which to start reading the int
    
    order - the order of the bytes of the int
    
    Returns:
    
    The int
  - getUnsignedByte
```
public static int getUnsignedByte(java.nio.ByteBuffer buffer)
```
    Read an unsigned byte from a buffer
    
    Parameters:
    
    buffer - Buffer containing the bytes
    
    Returns:
    
    The unsigned byte as an int
  - getUnsignedByte
```
public static int getUnsignedByte(java.nio.ByteBuffer buffer,
                                  int offset)
```
    Read an unsigned byte from a buffer
    
    Parameters:
    
    buffer - Buffer containing the bytes
    
    offset - Offset at which to read the byte
    
    Returns:
    
    The unsigned byte as an int
  - getUnsignedShort
```
public static int getUnsignedShort(java.nio.ByteBuffer buffer)
```
    Read an unsigned short from a buffer
    
    Parameters:
    
    buffer - Buffer containing the short
    
    Returns:
    
    The unsigned short as an int
  - getUnsignedShort
```
public static int getUnsignedShort(java.nio.ByteBuffer buffer,
                                   int offset)
```
    Read an unsigned short from a buffer
    
    Parameters:
    
    buffer - Buffer containing the short
    
    offset - Offset at which to read the short
    
    Returns:
    
    The unsigned short as an int
  - getInt
```
public static int getInt(java.nio.ByteBuffer buffer,
                         java.nio.ByteOrder order)
```
    Parameters:
    
    buffer - Buffer containing the bytes
    
    order - the order of the bytes of the int
    
    Returns:
    
    an int from the current position in the given buffer, read using the given ByteOrder
  - getInt
```
public static int getInt(java.nio.ByteBuffer buffer,
                         int offset,
                         java.nio.ByteOrder order)
```
    Parameters:
    
    buffer - Buffer containing the bytes
    
    offset - Offset at which to start reading the int
    
    order - the order of the bytes of the int
    
    Returns:
    
    an int from the given position in the given buffer, read using the given ByteOrder
  - putInt
```
public static void putInt(java.nio.ByteBuffer buffer,
                          int val,
                          java.nio.ByteOrder order)
```
    Writes an int at the current position in the given buffer, using the given ByteOrder
    
    Parameters:
    
    buffer - buffer into which to insert the int
    
    val - Int to insert
    
    order - the order to insert the bytes of the int
  - putInt
```
public static void putInt(java.nio.ByteBuffer buffer,
                          int val,
                          int offset,
                          java.nio.ByteOrder order)
```
    Writes an int at the given position in the given buffer, using the given ByteOrder
    
    Parameters:
    
    buffer - buffer into which to insert the int
    
    val - Int to insert
    
    offset - offset at which to insert the int
    
    order - the order to insert the bytes of the int
  - getUnsignedVarInt
```
public static int getUnsignedVarInt(java.nio.ByteBuffer buffer,
                                    int numBytes)
```
    Read an unsigned variable length int from a buffer
    
    Parameters:
    
    buffer - Buffer containing the variable length int
    
    Returns:
    
    The unsigned int
  - getUnsignedVarInt
```
public static int getUnsignedVarInt(java.nio.ByteBuffer buffer,
                                    int offset,
                                    int numBytes)
```
    Read an unsigned variable length int from a buffer
    
    Parameters:
    
    buffer - Buffer containing the variable length int
    
    offset - Offset at which to read the value
    
    Returns:
    
    The unsigned int
  - getBytes
```
public static byte[] getBytes(java.nio.ByteBuffer buffer,
                              int len)
```
    Reads an array of bytes from the given buffer
    
    Parameters:
    
    buffer - Buffer containing the desired bytes
    
    len - length of the desired bytes
    
    Returns:
    
    a new buffer with the given number of bytes from the current position in the given buffer
  - getBytes
```
public static byte[] getBytes(java.nio.ByteBuffer buffer,
                              int offset,
                              int len)
```
    Reads an array of bytes from the given buffer at the given offset
    
    Parameters:
    
    buffer - Buffer containing the desired bytes
    
    offset - Offset at which to read the bytes
    
    len - length of the desired bytes
    
    Returns:
    
    a new buffer with the given number of bytes from the given position in the given buffer
  - concat
```
public static byte[] concat(byte[] b1,
                            byte[] b2)
```
    Concatenates and returns the given byte arrays.
  - clearRemaining
```
public static void clearRemaining(java.nio.ByteBuffer buffer)
```
    Sets all bits in the given remaining byte range to 0.
  - clearRange
```
public static void clearRange(java.nio.ByteBuffer buffer,
                              int start,
                              int end)
```
    Sets all bits in the given byte range to 0.
  - fillRange
```
public static void fillRange(java.nio.ByteBuffer buffer,
                             int start,
                             int end)
```
    Sets all bits in the given byte range to 1.
  - putRange
```
public static void putRange(java.nio.ByteBuffer buffer,
                            int start,
                            int end,
                            byte b)
```
    Sets all bytes in the given byte range to the given byte value.
  - matchesRange
```
public static boolean matchesRange(java.nio.ByteBuffer buffer,
                                   int start,
                                   byte[] pattern)
```
    Matches a pattern of bytes against the given buffer starting at the given offset.
  - findRange
```
public static int findRange(java.nio.ByteBuffer buffer,
                            int start,
                            byte[] pattern)
```
    Searches for a pattern of bytes in the given buffer starting at the given offset.
    
    Returns:
    
    the offset of the pattern if a match is found, -1 otherwise
  - toHexString
```
public static java.lang.String toHexString(java.nio.ByteBuffer buffer,
                                           int size)
```
    Convert a byte buffer to a hexadecimal string for display
    
    Parameters:
    
    buffer - Buffer to display, starting at offset 0
    
    size - Number of bytes to read from the buffer
    
    Returns:
    
    The display String
  - toHexString
```
public static java.lang.String toHexString(byte[] array)
```
    Convert a byte array to a hexadecimal string for display
    
    Parameters:
    
    array - byte array to display, starting at offset 0
    
    Returns:
    
    The display String
  - toHexString
```
public static java.lang.String toHexString(java.nio.ByteBuffer buffer,
                                           int offset,
                                           int size)
```
    Convert a byte buffer to a hexadecimal string for display
    
    Parameters:
    
    buffer - Buffer to display, starting at offset 0
    
    offset - Offset at which to start reading the buffer
    
    size - Number of bytes to read from the buffer
    
    Returns:
    
    The display String
  - toHexString
```
public static java.lang.String toHexString(java.nio.ByteBuffer buffer,
                                           int offset,
                                           int size,
                                           boolean formatted)
```
    Convert a byte buffer to a hexadecimal string for display
    
    Parameters:
    
    buffer - Buffer to display, starting at offset 0
    
    offset - Offset at which to start reading the buffer
    
    size - Number of bytes to read from the buffer
    
    formatted - flag indicating if formatting is required
    
    Returns:
    
    The display String
  - toHexString
```
public static java.lang.String toHexString(DatabaseImpl db,
                                           int pageNumber,
                                           int size)
                                    throws java.io.IOException
```
    Convert the given number of bytes from the given database page to a hexidecimal string for display.
    
    Throws:
    
    java.io.IOException
  - writeHexString
```
public static void writeHexString(java.nio.ByteBuffer buffer,
                                  java.lang.String hexStr)
                           throws java.io.IOException
```
    Writes a sequence of hexidecimal values into the given buffer, where every two characters represent one byte value.
    
    Throws:
    
    java.io.IOException
  - toHexFile
```
public static void toHexFile(java.lang.String fileName,
                             java.nio.ByteBuffer buffer,
                             int offset,
                             int size)
                      throws java.io.IOException
```
    Writes a chunk of data to a file in pretty printed hexidecimal.
    
    Throws:
    
    java.io.IOException
  - asUnsignedByte
```
public static int asUnsignedByte(byte b)
```
    Returns:
    
    the byte value converted to an unsigned int value
  - asUnsignedShort
```
public static int asUnsignedShort(short s)
```
    Returns:
    
    the short value converted to an unsigned int value
  - swap8Bytes
```
public static void swap8Bytes(byte[] bytes,
                              int offset)
```
    Swaps the 8 bytes (changes endianness) of the bytes at the given offset.
    
    Parameters:
    
    bytes - buffer containing bytes to swap
    
    offset - offset of the first byte of the bytes to swap
  - swap4Bytes
```
public static void swap4Bytes(byte[] bytes,
                              int offset)
```
    Swaps the 4 bytes (changes endianness) of the bytes at the given offset.
    
    Parameters:
    
    bytes - buffer containing bytes to swap
    
    offset - offset of the first byte of the bytes to swap
  - swap2Bytes
```
public static void swap2Bytes(byte[] bytes,
                              int offset)
```
    Swaps the 2 bytes (changes endianness) of the bytes at the given offset.
    
    Parameters:
    
    bytes - buffer containing bytes to swap
    
    offset - offset of the first byte of the bytes to swap
  - swapBytesAt
```
private static void swapBytesAt(byte[] bytes,
                                int p1,
                                int p2)
```
    Swaps the bytes at the given positions.
  - forward
```
public static int forward(java.nio.ByteBuffer buffer,
                          int count)
```
    Moves the position of the given buffer the given count from the current position.
    
    Returns:
    
    the new buffer position
  - copyOf
```
public static byte[] copyOf(byte[] arr,
                            int newLength)
```
    Returns a copy of the given array of the given length.
  - copyOf
```
public static byte[] copyOf(byte[] arr,
                            int offset,
                            int newLength)
```
    Returns a copy of the given array of the given length starting at the given position.
  - copyOf
```
public static byte[] copyOf(byte[] arr,
                            int offset,
                            int newLength,
                            int dstOffset)
```
    Returns a copy of the given array of the given length starting at the given position.
  - copy
```
public static void copy(java.io.InputStream in,
                        java.io.OutputStream out)
                 throws java.io.IOException
```
    Copies the given InputStream to the given OutputStream.
    
    Throws:
    
    java.io.IOException
  - closeQuietly
```
public static void closeQuietly(java.io.Closeable c)
```
    Closes the given Closeable if non-null, swallows any IOExceptions.

Class ByteUtil

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

HEX_CHARS

NUM_BYTES_PER_BLOCK

NUM_BYTES_PER_LINE

Constructor Detail

ByteUtil

Method Detail

put3ByteInt

put3ByteInt

put3ByteInt

get3ByteInt

get3ByteInt

get3ByteInt

get3ByteInt

getUnsignedByte

getUnsignedByte

getUnsignedShort

getUnsignedShort

getInt

getInt

putInt

putInt

getUnsignedVarInt

getUnsignedVarInt

getBytes

getBytes

concat

clearRemaining

clearRange

fillRange

putRange

matchesRange

findRange

toHexString

toHexString

toHexString

toHexString

toHexString

writeHexString

toHexFile

asUnsignedByte

asUnsignedShort

swap8Bytes

swap4Bytes

swap2Bytes

swapBytesAt

forward

copyOf

copyOf

copyOf

copy

closeQuietly