org.apache.tomcat.util.buf

## Class UDecoder

- java.lang.Object
- - org.apache.tomcat.util.buf.UDecoder

-     public final class UDecoder
      extends Object

  All URL decoding happens here. This way we can reuse, review, optimize without adding complexity to the buffers. The conversion will modify the original buffer.
  Author:
    Costin Manolache

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static boolean` | `ALLOW_ENCODED_SLASH` Deprecated.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `UDecoder()`

  - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `convert(ByteChunk mb, boolean query)` URLDecode, will modify the source.
    `void` | `convert(ByteChunk mb, EncodedSolidusHandling encodedSolidusHandling)` URLDecode, will modify the source.
    `void` | `convert(CharChunk mb, boolean query)` Deprecated. Unused. Will be removed in Tomcat 10
    `void` | `convert(MessageBytes mb, boolean query)` Deprecated. Unused. Will be removed in Tomcat 10
    `String` | `convert(String str, boolean query)` Deprecated. Unused. Will be removed in Tomcat 10
    `static String` | `URLDecode(String str)` Deprecated. Unused. This will be removed in Tomcat 10 onwards
    `static String` | `URLDecode(String str, Charset charset)` Decode and return the specified URL-encoded String.

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

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

- - ### Field Detail

    - #### ALLOW_ENCODED_SLASH

          @Deprecated
          public static final boolean ALLOW_ENCODED_SLASH

      Deprecated.

  - ### Constructor Detail

    - #### UDecoder

          public UDecoder()

  - ### Method Detail

    - #### convert

          public void convert(ByteChunk mb,
                              boolean query)
                       throws IOException

      URLDecode, will modify the source. Assumes source bytes are encoded using a superset of US-ASCII as per RFC 7230. "%2f" will be rejected unless the input is a query string.
      Parameters:
        `mb` - The URL encoded bytes
        `query` - `true` if this is a query string. For a query string '+' will be decoded to ' '
      Throws:
        `IOException` - Invalid %xx URL encoding

    - #### convert

          public void convert(ByteChunk mb,
                              EncodedSolidusHandling encodedSolidusHandling)
                       throws IOException

      URLDecode, will modify the source. Assumes source bytes are encoded using a superset of US-ASCII as per RFC 7230.
      Parameters:
        `mb` - The URL encoded bytes
        `encodedSolidusHandling` - How should the %2f sequence handled by the decoder? For query strings this parameter will be ignored and the %2f sequence will be decoded
      Throws:
        `IOException` - Invalid %xx URL encoding

    - #### convert

          @Deprecated
          public void convert(CharChunk mb,
                                          boolean query)
                                   throws IOException

      Deprecated. Unused. Will be removed in Tomcat 10
      In-buffer processing - the buffer will be modified.

      WARNING: This method assumes US-ASCII encoding.

      Parameters:
        `mb` - The URL encoded chars
        `query` - `true` if this is a query string
      Throws:
        `IOException` - Invalid %xx URL encoding

    - #### convert

          @Deprecated
          public void convert(MessageBytes mb,
                                          boolean query)
                                   throws IOException

      Deprecated. Unused. Will be removed in Tomcat 10
      URLDecode, will modify the source.

      WARNING: This method assumes US-ASCII encoding.

      Parameters:
        `mb` - The URL encoded String, bytes or chars
        `query` - `true` if this is a query string
      Throws:
        `IOException` - Invalid %xx URL encoding

    - #### convert

          @Deprecated
          public final String convert(String str,
                                                  boolean query)

      Deprecated. Unused. Will be removed in Tomcat 10
      %xx decoding of a string.

      WARNING: This method assumes US-ASCII encoding.

      FIXME: this is inefficient.

      Parameters:
        `str` - The URL encoded string
        `query` - `true` if this is a query string
      Returns:
        the decoded string

    - #### URLDecode

          @Deprecated
          public static String URLDecode(String str)

      Deprecated. Unused. This will be removed in Tomcat 10 onwards
      Decode and return the specified URL-encoded String. When the byte array is converted to a string, UTF-8 is used. This may be different than some other servers. It is assumed the string is not a query string.
      Parameters:
        `str` - The url-encoded string
      Returns:
        the decoded string
      Throws:
        `IllegalArgumentException` - if a '%' character is not followed by a valid 2-digit hexadecimal number

    - #### URLDecode

          public static String URLDecode(String str,
                                         Charset charset)

      Decode and return the specified URL-encoded String. It is assumed the string is not a query string.
      Parameters:
        `str` - The url-encoded string
        `charset` - The character encoding to use; if null, UTF-8 is used.
      Returns:
        the decoded string
      Throws:
        `IllegalArgumentException` - if a '%' character is not followed by a valid 2-digit hexadecimal number

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