Package org.apache.coyote.http11.filters

# Class ChunkedInputFilter

java.lang.Object
org.apache.coyote.http11.filters.ChunkedInputFilter

All Implemented Interfaces:
  `InputFilter`, `InputBuffer`, `ApplicationBufferHandler`

public class ChunkedInputFilter extends Object implements InputFilter, ApplicationBufferHandler
Chunked input filter. Parses chunked data according to http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.6.1

Author:
  Remy Maucherat

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `protected InputBuffer`
  `buffer`
  Next buffer in the pipeline.
  `protected static final ByteChunk`
  `ENCODING`
  `protected static final String`
  `ENCODING_NAME`
  `protected boolean`
  `endChunk`
  Flag set to true when the end chunk has been read.
  `protected boolean`
  `needCRLFParse`
  Flag set to true if the next call to doRead() must parse a CRLF pair before doing anything else.
  `protected ByteBuffer`
  `readChunk`
  Byte chunk used to read bytes.
  `protected int`
  `remaining`
  Number of bytes remaining in the current chunk.
  `protected final ByteChunk`
  `trailingHeaders`
  Byte chunk used to store trailing headers.

  ### Fields inherited from interface org.apache.tomcat.util.net.ApplicationBufferHandler

  `EMPTY, EMPTY_BUFFER`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `ChunkedInputFilter(int maxTrailerSize, Set<String> allowedTrailerHeaders, int maxExtensionSize, int maxSwallowSize)`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `int`
  `available()`
  Amount of bytes still available in a buffer.
  `int`
  `doRead(ApplicationBufferHandler handler)`
  Read from the input stream into the ByteBuffer provided by the ApplicationBufferHandler.
  `long`
  `end()`
  End the current request.
  `void`
  `expand(int size)`
  `ByteBuffer`
  `getByteBuffer()`
  `ByteChunk`
  `getEncodingName()`
  Return the name of the associated encoding; Here, the value is "identity".
  `boolean`
  `isFinished()`
  Has the request body been read fully?
  `protected boolean`
  `parseChunkHeader()`
  Parse the header of a chunk.
  `protected void`
  `parseCRLF(boolean tolerant)`
  Parse CRLF at end of chunk.
  `protected void`
  `parseEndChunk()`
  Parse end chunk data.
  `protected int`
  `readBytes()`
  Read bytes from the previous buffer.
  `void`
  `recycle()`
  Make the filter ready to process the next request.
  `void`
  `setBuffer(InputBuffer buffer)`
  Set the next buffer in the filter pipeline.
  `void`
  `setByteBuffer(ByteBuffer buffer)`
  `void`
  `setRequest(Request request)`
  Read the content length from the request.

  ### Methods inherited from class java.lang.Object

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

- ## Field Details

  - ### ENCODING_NAME

    protected static final String ENCODING_NAME
    See Also:
      - Constant Field Values

  - ### ENCODING

    protected static final ByteChunk ENCODING

  - ### buffer

    protected InputBuffer buffer
    Next buffer in the pipeline.

  - ### remaining

    protected int remaining
    Number of bytes remaining in the current chunk.

  - ### readChunk

    protected ByteBuffer readChunk
    Byte chunk used to read bytes.

  - ### endChunk

    protected boolean endChunk
    Flag set to true when the end chunk has been read.

  - ### trailingHeaders

    protected final ByteChunk trailingHeaders
    Byte chunk used to store trailing headers.

  - ### needCRLFParse

    protected boolean needCRLFParse
    Flag set to true if the next call to doRead() must parse a CRLF pair before doing anything else.

- ## Constructor Details

  - ### ChunkedInputFilter

    public ChunkedInputFilter(int maxTrailerSize, Set<String> allowedTrailerHeaders, int maxExtensionSize, int maxSwallowSize)

- ## Method Details

  - ### doRead

    public int doRead(ApplicationBufferHandler handler) throws IOException
    Description copied from interface: `InputBuffer`
    Read from the input stream into the ByteBuffer provided by the ApplicationBufferHandler. IMPORTANT: the current model assumes that the protocol will 'own' the ByteBuffer and return a pointer to it.
    Specified by:
      `doRead` in interface `InputBuffer`
    Parameters:
      `handler` - ApplicationBufferHandler that provides the buffer to read data into.
    Returns:
      The number of bytes that have been added to the buffer or -1 for end of stream
    Throws:
      `IOException` - If an I/O error occurs reading from the input stream

  - ### setRequest

    public void setRequest(Request request)
    Read the content length from the request.
    Specified by:
      `setRequest` in interface `InputFilter`
    Parameters:
      `request` - The request to be associated with this filter

  - ### end

    public long end() throws IOException
    End the current request.
    Specified by:
      `end` in interface `InputFilter`
    Returns:
      0 is the expected return value. A positive value indicates that too many bytes were read. This method is allowed to use buffer.doRead to consume extra bytes. The result of this method can't be negative (if an error happens, an IOException should be thrown instead).
    Throws:
      `IOException` - If an error happens

  - ### available

    public int available()
    Amount of bytes still available in a buffer.
    Specified by:
      `available` in interface `InputBuffer`
    Returns:
      The number of bytes that can be read without blocking

  - ### setBuffer

    public void setBuffer(InputBuffer buffer)
    Set the next buffer in the filter pipeline.
    Specified by:
      `setBuffer` in interface `InputFilter`
    Parameters:
      `buffer` - The next buffer

  - ### recycle

    public void recycle()
    Make the filter ready to process the next request.
    Specified by:
      `recycle` in interface `InputFilter`

  - ### getEncodingName

    public ByteChunk getEncodingName()
    Return the name of the associated encoding; Here, the value is "identity".
    Specified by:
      `getEncodingName` in interface `InputFilter`
    Returns:
      The encoding name as a byte chunk to facilitate comparison with the value read from the HTTP headers which will also be a ByteChunk

  - ### isFinished

    public boolean isFinished()
    Description copied from interface: `InputFilter`
    Has the request body been read fully?
    Specified by:
      `isFinished` in interface `InputFilter`
    Returns:
      `true` if the request body has been fully read, otherwise `false`

  - ### readBytes

    protected int readBytes() throws IOException
    Read bytes from the previous buffer.
    Returns:
      The byte count which has been read
    Throws:
      `IOException` - Read error

  - ### parseChunkHeader

    protected boolean parseChunkHeader() throws IOException
    Parse the header of a chunk. A chunk header can look like one of the following:
    A10CRLF
    F23;chunk-extension to be ignoredCRLF

    The letters before CRLF or ';' (whatever comes first) must be valid hex digits. We should not parse F23IAMGONNAMESSTHISUP34CRLF as a valid header according to the spec.

    Returns:
      `true` if the chunk header has been successfully parsed
    Throws:
      `IOException` - Read error

  - ### parseCRLF

    protected void parseCRLF(boolean tolerant) throws IOException
    Parse CRLF at end of chunk.
    Parameters:
      `tolerant` - Should tolerant parsing (LF and CRLF) be used? This is recommended (RFC2616, section 19.3) for message headers.
    Throws:
      `IOException` - An error occurred parsing CRLF

  - ### parseEndChunk

    protected void parseEndChunk() throws IOException
    Parse end chunk data.
    Throws:
      `IOException` - Error propagation

  - ### setByteBuffer

    public void setByteBuffer(ByteBuffer buffer)
    Specified by:
      `setByteBuffer` in interface `ApplicationBufferHandler`

  - ### getByteBuffer

    public ByteBuffer getByteBuffer()
    Specified by:
      `getByteBuffer` in interface `ApplicationBufferHandler`

  - ### expand

    public void expand(int size)
    Specified by:
      `expand` in interface `ApplicationBufferHandler`