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package io.pkts.buffer;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
/**
* Yet another buffer class!
*
* Kind of the same as the awesome classes in netty.io but currently the buffer
* classes in netty are a little too tied into the rest of the netty stack.
* Therefore, copy-pasting the necessary pieces needed for this project. Also,
* since this entire project (i.e. yajpcap) is only for one particular use case,
* we don't need all the flexibility of netty's buffers, even though somewhat
* silly to re-invent the wheel.
*
* @author [email protected]
*/
public interface Buffer extends Cloneable {
/**
* Same as calling {@link #getBytes(int, Buffer)} where the index is
* {@link #getReaderIndex()}.
*
* @param dst
* @throws IndexOutOfBoundsException
*/
void getBytes(Buffer dst);
/**
* Transfer this buffer's data to the destination buffer. This method does
* not change the readerIndex or the writerIndex
* of the src buffer (i.e. this) but will increase the
* writerIndex of the destination buffer.
*
* @param index
* @param dst
* @throws IndexOutOfBoundsException
* in case index < 0
*/
void getBytes(final int index, final Buffer dst) throws IndexOutOfBoundsException;
void getByes(final byte[] dst) throws IndexOutOfBoundsException;
/**
* Read the requested number of bytes and increase the readerIndex with the
* corresponding number of bytes. The new buffer and this buffer both share
* the same backing array so changing either one of them will affect the
* other.
*
* @param length
* @return
* @throws IndexOutOfBoundsException
* @throws IOException
*/
Buffer readBytes(int length) throws IndexOutOfBoundsException, IOException;
/**
* Reads a line, i.e., it reads until we hit a line feed ('\n') or a
* carriage return ('\r'), or a carriage return followed immediately by a
* line feed.
*
* @return a buffer containing the line but without the line terminating
* characters
*/
Buffer readLine() throws IOException;
/**
* Read until we find a double CRLF. The double CRLF will NOT be part of the
* returned buffer but they will be consumed.
*
* If we cannot find a double CRLF then null will be returned and the passed
* in buffer will be reset to the same reader index as when it was passed
* in.
*
* @return the resulting buffer containing everything up until (but not
* inclusive) the double-crlf or null if no double-crlf was not
* found.
*/
Buffer readUntilDoubleCRLF() throws IOException;
/**
* Returns the number of available bytes for reading without blocking. If
* this returns less than what you want, there may still be more bytes
* available depending on the underlying implementation. E.g., a Buffer
* backed by an {@link InputStream} may be able to read more off the stream,
* however, it may not be able to do so without blocking.
*
* @return
*/
int getReadableBytes();
/**
* Checks whether this buffer has any bytes available for reading without
* blocking.
*
* This is the same as {@link #getReadableBytes()} > 0
*
* @return
*/
boolean hasReadableBytes();
/**
* Check whether this buffer is empty or not. This is the same as
* !{@link #hasReadableBytes()}
*
* @return
*/
boolean isEmpty();
/**
* Get the backing array.
*
* @return
*/
byte[] getArray();
default byte[] getRawArray() {
return getArray();
}
/**
* Same as {@link #readUntil(4096, 'b')}
*
* Read until the specified byte is encountered and return a buffer
* representing that section of the buffer.
*
* If the byte isn't found, then a {@link ByteNotFoundException} is thrown
* and the {@link #getReaderIndex()} is left where we bailed out.
*
* Note, the byte we are looking for will have been consumed so whatever
* that is left in the {@link Buffer} will not contain that byte.
*
* Example:
* Buffer buffer = Buffers.wrap("hello world");
* Buffer hello = buffer.readUntil((byte)' ');
* System.out.println(hello); // will contain "hello"
* System.out.println(buffer); // will contain "world"
*
*
* As the example above illustrates, we are looking for a space, which is
* found between "hello" and "world". Since the space will be consumed, the
* original buffer will now only contain "world" and not " world".
*
* @param b
* the byte to look for
* @return a buffer containing the content from the initial reader index to
* the the position where the byte was found (exclusive the byte we
* are looking for)
*
* @throws ByteNotFoundException
* in case the byte we were looking for is not found.
*/
Buffer readUntil(byte b) throws IOException, ByteNotFoundException;
/**
* Read until any of the specified bytes have been encountered or until we
* have read a maximum amount of bytes. This one works exactly the same as
* {@link #readUntil(byte)} except it allows you to look for multiple bytes
* and to specify for how many bytes we should be looking before we give up.
*
* Example, we want to read until we either find
*
* @param maxBytes
* the maximum number of bytes we would like to read before
* giving up.
* @param bytes
* the bytes we are looking for (either one of them)
* @return a buffer containing the content from the initial reader index to
* the the position where the byte was found (exclusive the byte we
* are looking for)
* @throws IOException
* @throws ByteNotFoundException
* in case none of the bytes we were looking for are found
* within the specified maximum number of bytes.
* @throws IllegalArgumentException
* in no bytes to look for is specified.
*/
Buffer readUntil(int maxBytes, byte... bytes) throws IOException, ByteNotFoundException, IllegalArgumentException;
/**
* Same as {@link #readUntil(int, byte...)} but instead of returning the
* buffer with everything up until the specified byte it returns the index
* instead.
*
* NOTE. The index is representing where in the {@link Buffer} you can find
* the byte and the index is in relation to the entire {@link Buffer} and
* its capacity so even if you have already read x bytes, it would not
* change the index of what you search for.
*
* Example:
*
*
* @param maxBytes
* the maximum number of bytes we would like to read before
* giving up.
* @param bytes
* the bytes we are looking for (either one of them)
* @return the index of the found byte or -1 (negative one) if we couldn't
* find it.
* @throws IOException
* @throws ByteNotFoundException
* will ONLY be thrown if we haven't found the byte within the
* maxBytes limit. If the buffer we are searching in is less
* than maxBytes and we can't find what we are looking for then
* negative one will be returned instead.
*/
int indexOf(int maxBytes, byte... bytes) throws IOException, ByteNotFoundException, IllegalArgumentException;
/**
*
* @param b
* @return
* @throws IOException
* @throws ByteNotFoundException
* @throws IllegalArgumentException
*/
int indexOf(byte b) throws IOException, ByteNotFoundException, IllegalArgumentException;
/**
* Get a slice of the buffer starting at start (inclusive)
* ending at stop (exclusive). Hence, the new capacity of the
* buffer is stop - start
*
* @return
*/
Buffer slice(int start, int stop);
/**
* Same as {@link #slice(Buffer.getReaderIndex(), int)}
*
* @param stop
* @return
*/
Buffer slice(int stop);
/**
* Slice off the rest of the buffer. Same as {@link
* #slice(Buffer.getReaderIndex(), buffer.getCapacity())}
*
* Note, if you slice an empty buffer you will get back another empty
* buffer. Same goes for when you slice a buffer whose bytes already have
* been consumed.
*
* @return
*/
Buffer slice();
/**
* The reader index
*
* @return
*/
int getReaderIndex();
void setReaderIndex(int index);
/**
* Mark the current position of the reader index.
*
* @see #reset()
*/
void markReaderIndex();
/**
* Reset the reader index to the marked position or to the beginning of the
* buffer if mark hasn't explicitly been called.
*/
void resetReaderIndex();
/**
* The capacity of this buffer. The capacity is not affected by where the
* reader index is etc
*
* @return the capacity
*/
int capacity();
/**
* Get the byte at the index.
*
* Note, depending on the underlying implementing buffer, this method may
* block and try and read the missing bytes off a stream. E.g., the
* {@link InputStreamBuffer} gets its bytes off of a {@link InputStream} so
* let's say you have read 10 bytes off of the stream already but ask to
* access the byte at index 20, we will try and ready an additional 10 bytes
* from the InputStream so we can return the byte at index 20.
*
* @param index
* @return the byte at the specified index
* @throws IndexOutOfBoundsException
* in case the index is greater than the capacity of this buffer
*/
byte getByte(int index) throws IndexOutOfBoundsException, IOException;
/**
* Read the next byte, which will also increase the readerIndex by one.
*
* @return the next byte
* @throws IndexOutOfBoundsException
* in case there is nothing left to read
*/
byte readByte() throws IndexOutOfBoundsException, IOException;
/**
* Peak a head to see what the next byte is. This method will not change the
* readerIndex
*
* @return the next byte
* @throws IndexOutOfBoundsException
* in case there is nothing left to read
*/
byte peekByte() throws IndexOutOfBoundsException, IOException;
/**
* Read an unsigned int and will increase the reader index of this buffer by
* 4
*
* @return a long representing the unsigned int
* @throws IndexOutOfBoundsException
* in case there is not 4 bytes left to read
*/
long readUnsignedInt() throws IndexOutOfBoundsException;
/**
* Read an int and will increase the reader index of this buffer by 4
*
* @return the int value
* @throws IndexOutOfBoundsException
* in case there is not 4 bytes left to read
*/
int readInt() throws IndexOutOfBoundsException;
/**
* Get a 32-bit integer at the specified absolute index. This method will
* not modify the readerIndex of this buffer.
*
* @param index
* @return
* @throws IndexOutOfBoundsException
* in case there is not 4 bytes left to read
*/
int getInt(int index) throws IndexOutOfBoundsException;
void setInt(int index, int value) throws IndexOutOfBoundsException;
void setUnsignedInt(int index, long value) throws IndexOutOfBoundsException;
short getShort(int index) throws IndexOutOfBoundsException;
int readUnsignedShort() throws IndexOutOfBoundsException;
int getUnsignedShort(int index) throws IndexOutOfBoundsException;
void setUnsignedShort(int index, int value) throws IndexOutOfBoundsException;
short readShort() throws IndexOutOfBoundsException;
short readUnsignedByte() throws IndexOutOfBoundsException, IOException;
short getUnsignedByte(int index) throws IndexOutOfBoundsException;
void setUnsignedByte(int index, short value) throws IndexOutOfBoundsException;
/**
* Parse all the readable bytes in this buffer as a unsigned integer value.
* The reader index will not be modified.
*
* @return
* @throws NumberFormatException
* in case the bytes in the buffer cannot be converted into an
* integer value.
* @throws IOException
* in case anything goes wrong when reading from the underlying
*/
int parseToInt() throws NumberFormatException, IOException;
/**
* Convert the entire buffer to a signed integer value
*
* @param radix
* @return
*/
int parseToInt(int radix) throws NumberFormatException, IOException;
/**
* Dump the content of this buffer as a hex dump ala Wireshark. Mainly for
* debugging purposes
*
* @return
*/
String dumpAsHex();
/**
* Performs a deep clone of this object. I.e., the array that is backed by
* this buffer will be copied and a new buffer will be returned. Hence, any
* changes to the backing of this buffer will not affect the cloned buffer.
*
* @return
*/
Buffer clone();
/**
* Set the byte at given index to a new value
*
* @param index
* the index
* @param value
* the value
* @throws IndexOutOfBoundsException
*/
void setByte(int index, byte value) throws IndexOutOfBoundsException;
/**
* The writer index. This is where we will be writing our next byte if asked
* to do so.
*
* @return
*/
int getWriterIndex();
/**
* Get the number of writable bytes.
*
* @return
*/
int getWritableBytes();
/**
* Checks whether this {@link Buffer} has any space left for writing. Same
* as {@link #getWritableBytes()} > 0
*
* @return
*/
boolean hasWritableBytes();
/**
* Check whether this {@link Buffer} has write support or not. There are
* buffers that do not allow you to write to them (such as the
* {@link EmptyBuffer}) so if you try and write to such a buffer it will
* throw a {@link WriteNotSupportedException}.
*
* @return
*/
boolean hasWriteSupport();
/**
* Write a byte to where the current writer index is pointing. Note, many
* implementations may not support writing and if they don't, they will
* throw a {@link WriteNotSupportedException}
*
* @param b
* @throws IndexOutOfBoundsException
* in case there is no more space to write to (which includes
* those cases where the underlying implementation does not
* support writing)
* @throws WriteNotSupportedException
* in case the underlying implementation does not support
* writes.
*/
void write(byte b) throws IndexOutOfBoundsException, WriteNotSupportedException;
void write(int value) throws IndexOutOfBoundsException, WriteNotSupportedException;
void write(long value) throws IndexOutOfBoundsException, WriteNotSupportedException;
/**
* Same as {@link Buffer#write(String, String)} where the charset is set to
* "UTF-8"
*
* @param s
* @throws IndexOutOfBoundsException
* in case we cannot write entire String to this {@link Buffer}.
* @throws WriteNotSupportedException
* in case the underlying implementation does not support
* writes.
* @throws UnsupportedEncodingException
* in case the charset "UTF-8" is not supported by the platform.
*/
void write(String s) throws IndexOutOfBoundsException, WriteNotSupportedException, UnsupportedEncodingException;
/**
* Write the integer value to this {@link Buffer} as a String.
*
* @param value
* the value that will be converted to a String before being
* written to this {@link Buffer}.
* @throws IndexOutOfBoundsException
* @throws WriteNotSupportedException
*/
void writeAsString(int value) throws IndexOutOfBoundsException, WriteNotSupportedException;
/**
* Write the long value to this {@link Buffer} as a String.
*
* @param value the value that will be converted to a String before being written to this
* {@link Buffer}.
* @throws IndexOutOfBoundsException
* @throws WriteNotSupportedException
*/
void writeAsString(long value) throws IndexOutOfBoundsException, WriteNotSupportedException;
/**
* Write a string to this buffer using the specified charset to convert the String into bytes.
* The writerInxex of this buffer will be increased with the corresponding number
* of bytes.
*
* Note, either the entire string is written to this buffer or if it doesn't fit then nothing is
* written to this buffer.
*
* @param s
* @param charset
* @throws IndexOutOfBoundsException in case we cannot write entire String to this
* {@link Buffer}.
* @throws WriteNotSupportedException
* @throws UnsupportedEncodingException in case the specified charset is not supported
*/
void write(final String s, String charset) throws IndexOutOfBoundsException, WriteNotSupportedException,
UnsupportedEncodingException;
/**
* Check whether to buffers are considered to be equal.
*
* To buffers are equal if the underlying visible area of the byte array are
* equal.
*
* @param b
* @return
*/
@Override
boolean equals(Object b);
boolean equalsIgnoreCase(Object b);
@Override
int hashCode();
@Override
String toString();
}
