Apache Tomcat 7.0.42

## Package org.apache.tomcat.util.buf

Buffers and Encodings This package contains buffers and utils to perform encoding/decoding of buffers.

See:
Description

Interface Summary
ByteChunk.ByteInputChannel: Input interface, used when the buffer is empty Same as java.nio.channel.ReadableByteChannel
ByteChunk.ByteOutputChannel: Same as java.nio.channel.WrittableByteChannel.
CharChunk.CharInputChannel
CharChunk.CharOutputChannel: When we need more space we'll either grow the buffer ( up to the limit ) or send it to a channel.

Class Summary
Ascii: This class implements some basic ASCII character handling functions.
B2CConverter: NIO based character decoder.
ByteChunk: This class is used to represent a chunk of bytes, and utilities to manipulate byte[].
C2BConverter: NIO based character encoder.
CharChunk: Utilities to manipulate char chunks.
Constants: String constants for the file package.
HexUtils: Tables useful when converting byte arrays to and from strings of hexadecimal digits.
MessageBytes: This class is used to represent a subarray of bytes in an HTTP message.
MessageBytes.MessageBytesFactory
StringCache: This class implements a String cache for ByteChunk and CharChunk.
StringCache.ByteEntry
StringCache.CharEntry
UDecoder: All URL decoding happens here.
UEncoder: Efficient implementation for encoders.
Utf8Decoder: Decodes bytes to UTF-8.

## Package org.apache.tomcat.util.buf Description

# Buffers and Encodings

This package contains buffers and utils to perform encoding/decoding of buffers. That includes byte to char conversions, URL encodings, etc.

Encoding is a critical operation for performance. There are few tricks in this package - the C2B and B2C converters are caching a ISReader/OSWriter and keep everything allocated to do the conversions in any VM without any garbage.

This package must accomodate future extensions and additional converters ( most imporant: the nio.charset, which should be detected and used if available ). Also, we do have one hand-written UTF8Decoder, and other tuned encoders could be added.

My benchmarks ( I'm costin :-) show only small differences between C2B, B2C and hand-written codders/decoders, so UTF8Decoder may be disabled.

Apache Tomcat 7.0.42

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