Package org.apache.tomcat.util.buf

## Class UDecoder

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

-     public final class UDecoder
      extends java.lang.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 | Description
    --- | --- | ---
    `static boolean` | `ALLOW_ENCODED_SLASH` | Deprecated.

  - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `UDecoder()` |

  - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `java.lang.String` | `convert​(java.lang.String str, boolean query)` | Deprecated. Unused.
    `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.
    `void` | `convert​(MessageBytes mb, boolean query)` | Deprecated. Unused.
    `static java.lang.String` | `URLDecode​(byte[] bytes, java.lang.String enc, boolean isQuery)` | Deprecated. This method will be removed in Tomcat 9
    `static java.lang.String` | `URLDecode​(java.lang.String str)` | Deprecated. Unused.
    `static java.lang.String` | `URLDecode​(java.lang.String str, java.lang.String enc)` | Deprecated. This method will be removed in Tomcat 9
    `static java.lang.String` | `URLDecode​(java.lang.String str, java.lang.String enc, boolean isQuery)` | Deprecated. This method will be removed in Tomcat 9
    `static java.lang.String` | `URLDecode​(java.lang.String str, java.nio.charset.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 java.io.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:
        `java.io.IOException` - Invalid %xx URL encoding

    - #### convert

          public void convert​(ByteChunk mb,
                              EncodedSolidusHandling encodedSolidusHandling)
                       throws java.io.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:
        `java.io.IOException` - Invalid %xx URL encoding

    - #### convert

          @Deprecated
          public void convert​(CharChunk mb,
                              boolean query)
                       throws java.io.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:
        `java.io.IOException` - Invalid %xx URL encoding

    - #### convert

          @Deprecated
          public void convert​(MessageBytes mb,
                              boolean query)
                       throws java.io.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:
        `java.io.IOException` - Invalid %xx URL encoding

    - #### convert

          @Deprecated
          public final java.lang.String convert​(java.lang.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 java.lang.String URLDecode​(java.lang.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, ISO-885901 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:
        `java.lang.IllegalArgumentException` - if a '%' character is not followed by a valid 2-digit hexadecimal number

    - #### URLDecode

          @Deprecated
          public static java.lang.String URLDecode​(java.lang.String str,
                                                   java.lang.String enc)

      Deprecated.
      This method will be removed in Tomcat 9
      Decode and return the specified URL-encoded String. It is assumed the string is not a query string.
      Parameters:
        `str` - The url-encoded string
        `enc` - The encoding to use; if null, ISO-885901 is used. If an unsupported encoding is specified null will be returned
      Returns:
        the decoded string
      Throws:
        `java.lang.IllegalArgumentException` - if a '%' character is not followed by a valid 2-digit hexadecimal number

    - #### URLDecode

          public static java.lang.String URLDecode​(java.lang.String str,
                                                   java.nio.charset.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, ISO-8859-1 is used.
      Returns:
        the decoded string
      Throws:
        `java.lang.IllegalArgumentException` - if a '%' character is not followed by a valid 2-digit hexadecimal number

    - #### URLDecode

          @Deprecated
          public static java.lang.String URLDecode​(java.lang.String str,
                                                   java.lang.String enc,
                                                   boolean isQuery)

      Deprecated.
      This method will be removed in Tomcat 9
      Decode and return the specified URL-encoded String.
      Parameters:
        `str` - The url-encoded string
        `enc` - The encoding to use; if null, ISO-8859-1 is used. If an unsupported encoding is specified null will be returned
        `isQuery` - Is this a query string being processed
      Returns:
        the decoded string
      Throws:
        `java.lang.IllegalArgumentException` - if a '%' character is not followed by a valid 2-digit hexadecimal number

    - #### URLDecode

          @Deprecated
          public static java.lang.String URLDecode​(byte[] bytes,
                                                   java.lang.String enc,
                                                   boolean isQuery)

      Deprecated.
      This method will be removed in Tomcat 9
      Decode and return the specified URL-encoded byte array.
      Parameters:
        `bytes` - The url-encoded byte array
        `enc` - The encoding to use; if null, ISO-8859-1 is used. If an unsupported encoding is specified null will be returned
        `isQuery` - Is this a query string being processed
      Returns:
        the decoded string
      Throws:
        `java.lang.IllegalArgumentException` - if a '%' character is not followed by a valid 2-digit hexadecimal number