Package org.apache.http.impl.io

Class ChunkedInputStream

java.lang.Object
java.io.InputStream
org.apache.http.impl.io.ChunkedInputStream
All Implemented Interfaces:
Closeable, AutoCloseable
public class ChunkedInputStream extends InputStream
Implements chunked transfer coding. The content is received in small chunks. Entities transferred using this input stream can be of unlimited length. After the stream is read to the end, it provides access to the trailers, if any.

Note that this class NEVER closes the underlying stream, even when close gets called. Instead, it will read until the "end" of its chunking on close, which allows for the seamless execution of subsequent HTTP 1.1 requests, while not requiring the client to remember to read the entire contents of the response.

Since:
4.0

  • Field Details

    • CHUNK_LEN

      private static final int CHUNK_LEN
      See Also:

    • CHUNK_DATA

      private static final int CHUNK_DATA
      See Also:

    • CHUNK_CRLF

      private static final int CHUNK_CRLF
      See Also:

    • CHUNK_INVALID

      private static final int CHUNK_INVALID
      See Also:

    • BUFFER_SIZE

      private static final int BUFFER_SIZE
      See Also:

    • in

      private final SessionInputBuffer in
      The session input buffer

    • buffer

      private final CharArrayBuffer buffer

    • constraints

      private final MessageConstraints constraints

    • state

      private int state

    • chunkSize

      private long chunkSize
      The chunk size

    • pos

      private long pos
      The current position within the current chunk

    • eof

      private boolean eof
      True if we've reached the end of stream

    • closed

      private boolean closed
      True if this stream is closed

    • footers

      private Header[] footers

  • Constructor Details

    • ChunkedInputStream

      public ChunkedInputStream(SessionInputBuffer in, MessageConstraints constraints)
      Wraps session input stream and reads chunk coded input.
      Parameters:
      in - The session input buffer
      constraints - Message constraints. If null MessageConstraints.DEFAULT will be used.
      Since:
      4.4

    • ChunkedInputStream

      public ChunkedInputStream(SessionInputBuffer in)
      Wraps session input stream and reads chunk coded input.
      Parameters:
      in - The session input buffer

  • Method Details

    • available

      public int available() throws IOException
      Overrides:
      available in class InputStream
      Throws:
      IOException

    • read

      public int read() throws IOException

      Returns all the data in a chunked stream in coalesced form. A chunk is followed by a CRLF. The method returns -1 as soon as a chunksize of 0 is detected.

      Trailer headers are read automatically at the end of the stream and can be obtained with the getResponseFooters() method.

      Specified by:
      read in class InputStream
      Returns:
      -1 of the end of the stream has been reached or the next data byte
      Throws:
      IOException - in case of an I/O error

    • read

      public int read(byte[] b, int off, int len) throws IOException
      Read some bytes from the stream.
      Overrides:
      read in class InputStream
      Parameters:
      b - The byte array that will hold the contents from the stream.
      off - The offset into the byte array at which bytes will start to be placed.
      len - the maximum number of bytes that can be returned.
      Returns:
      The number of bytes returned or -1 if the end of stream has been reached.
      Throws:
      IOException - in case of an I/O error

    • read

      public int read(byte[] b) throws IOException
      Read some bytes from the stream.
      Overrides:
      read in class InputStream
      Parameters:
      b - The byte array that will hold the contents from the stream.
      Returns:
      The number of bytes returned or -1 if the end of stream has been reached.
      Throws:
      IOException - in case of an I/O error

    • nextChunk

      private void nextChunk() throws IOException
      Read the next chunk.
      Throws:
      IOException - in case of an I/O error

    • getChunkSize

      private long getChunkSize() throws IOException
      Expects the stream to start with a chunksize in hex with optional comments after a semicolon. The line must end with a CRLF: "a3; some comment\r\n" Positions the stream at the start of the next line.
      Throws:
      IOException

    • parseTrailerHeaders

      private void parseTrailerHeaders() throws IOException
      Reads and stores the Trailer headers.
      Throws:
      IOException - in case of an I/O error

    • close

      public void close() throws IOException
      Upon close, this reads the remainder of the chunked message, leaving the underlying socket at a position to start reading the next response without scanning.
      Specified by:
      close in interface AutoCloseable
      Specified by:
      close in interface Closeable
      Overrides:
      close in class InputStream
      Throws:
      IOException - in case of an I/O error

    • getFooters

      public Header[] getFooters()