java.lang.Object
- io.netty5.buffer.BufferUtil

```
public final class BufferUtil
extends Object
```
A collection of utility methods that is related with handling ByteBuf, such as the generation of hex dump and swapping an integer's byte order.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static void`	`appendPrettyHexDump(StringBuilder dump, Buffer buf)`	Appends the prettified multi-line hexadecimal dump of the specified `Buffer` to the specified `StringBuilder` that is easy to read by humans.
`static void`	`appendPrettyHexDump(StringBuilder dump, Buffer buf, int offset, int length)`	Appends the prettified multi-line hexadecimal dump of the specified `Buffer` to the specified `StringBuilder` that is easy to read by humans, starting at the given `offset` using the given `length`.
`static boolean`	`equals(Buffer first, int firstReaderOffset, Buffer second, int secondReaderOffset, int length)`	Returns `true` if and only if the two specified buffers are identical to each other for `length` bytes starting at `firstReaderOffset` index for the `first` buffer and `secondReaderOffset` index for the `second` buffer.
`static byte[]`	`getBytes(Buffer buf)`	Create a copy of the underlying storage from `buf` into a byte array.
`static byte[]`	`getBytes(Buffer buf, int start, int length)`	Create a copy of the underlying storage from `buf` into a byte array.
`static String`	`hexDump(byte[] array)`	Returns a hex dump of the specified byte array.
`static String`	`hexDump(byte[] array, int fromIndex, int length)`	Returns a hex dump of the specified byte array's sub-region.
`static String`	`hexDump(Buffer buffer)`	Returns a hex dump of the specified buffer's readable bytes.
`static String`	`hexDump(Buffer buffer, int fromIndex, int length)`	Returns a hex dump of the specified buffer's sub-region.
`static int`	`reverseMedium(int value)`	Reverses the byte order (endianness) of a medium
`static long`	`reverseUnsignedInt(long value)`	Reverses the byte order (endianness) of an unsigned integer
`static int`	`reverseUnsignedMedium(int value)`	Reverses the byte order (endianness) of an unsigned medium
`static int`	`reverseUnsignedShort(int value)`	Reverses the byte order (endianness) of an unsigned short
`static Buffer`	`threadLocalDirectBuffer()`	Returns a cached thread-local direct buffer, if available.
`static Buffer`	`writeAscii(BufferAllocator alloc, CharSequence seq)`	Encode a `CharSequence` in ASCII and write it to a `Buffer` allocated with `alloc`.

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

- Method Detail
  - reverseUnsignedShort
```
public static int reverseUnsignedShort(int value)
```
    Reverses the byte order (endianness) of an unsigned short
    
    Parameters:
    
    value - the number with original byte order
    
    Returns:
    
    the number with reversed byte order
  - reverseMedium
```
public static int reverseMedium(int value)
```
    Reverses the byte order (endianness) of a medium
    
    Parameters:
    
    value - the number with original byte order
    
    Returns:
    
    the number with reversed byte order
  - reverseUnsignedMedium
```
public static int reverseUnsignedMedium(int value)
```
    Reverses the byte order (endianness) of an unsigned medium
    
    Parameters:
    
    value - the number with original byte order
    
    Returns:
    
    the number with reversed byte order
  - reverseUnsignedInt
```
public static long reverseUnsignedInt(long value)
```
    Reverses the byte order (endianness) of an unsigned integer
    
    Parameters:
    
    value - the number with original byte order
    
    Returns:
    
    the number with reversed byte order
  - hexDump
```
public static String hexDump(Buffer buffer)
```
    Returns a hex dump of the specified buffer's readable bytes.
  - hexDump
```
public static String hexDump(Buffer buffer,
                             int fromIndex,
                             int length)
```
    Returns a hex dump of the specified buffer's sub-region.
  - hexDump
```
public static String hexDump(byte[] array)
```
    Returns a hex dump of the specified byte array.
  - hexDump
```
public static String hexDump(byte[] array,
                             int fromIndex,
                             int length)
```
    Returns a hex dump of the specified byte array's sub-region.
  - writeAscii
```
public static Buffer writeAscii(BufferAllocator alloc,
                                CharSequence seq)
```
    Encode a CharSequence in ASCII and write it to a Buffer allocated with alloc.
    
    Parameters:
    
    alloc - The allocator used to allocate a new Buffer.
    
    seq - The characters to write into a buffer.
    
    Returns:
    
    The Buffer which contains the ASCII encoded result.
  - getBytes
```
public static byte[] getBytes(Buffer buf)
```
    Create a copy of the underlying storage from buf into a byte array. The copy will start at Buffer.readerOffset() and copy Buffer.readableBytes() bytes.
  - getBytes
```
public static byte[] getBytes(Buffer buf,
                              int start,
                              int length)
```
    Create a copy of the underlying storage from buf into a byte array. The copy will start at start and copy length bytes.
  - equals
```
public static boolean equals(Buffer first,
                             int firstReaderOffset,
                             Buffer second,
                             int secondReaderOffset,
                             int length)
```
    Returns true if and only if the two specified buffers are identical to each other for length bytes starting at firstReaderOffset index for the first buffer and secondReaderOffset index for the second buffer. A more compact way to express this is:
    first[firstRoff : firstRoff + length] == second[secondRoff : secondRoff + length]
  - appendPrettyHexDump
```
public static void appendPrettyHexDump(StringBuilder dump,
                                       Buffer buf)
```
    Appends the prettified multi-line hexadecimal dump of the specified Buffer to the specified StringBuilder that is easy to read by humans.
  - appendPrettyHexDump
```
public static void appendPrettyHexDump(StringBuilder dump,
                                       Buffer buf,
                                       int offset,
                                       int length)
```
    Appends the prettified multi-line hexadecimal dump of the specified Buffer to the specified StringBuilder that is easy to read by humans, starting at the given offset using the given length.
  - threadLocalDirectBuffer
```
public static Buffer threadLocalDirectBuffer()
```
    Returns a cached thread-local direct buffer, if available.
    
    Returns:
    
    a cached thread-local direct buffer, if available. null otherwise.

Class BufferUtil

Method Summary

Methods inherited from class java.lang.Object

Method Detail

reverseUnsignedShort

reverseMedium

reverseUnsignedMedium

reverseUnsignedInt

hexDump

hexDump

hexDump

hexDump

writeAscii

getBytes

getBytes

equals

appendPrettyHexDump

appendPrettyHexDump

threadLocalDirectBuffer