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Diffstat (limited to 'src/com/kenai/jbosh/GZIPCodec.java')
-rw-r--r-- | src/com/kenai/jbosh/GZIPCodec.java | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/src/com/kenai/jbosh/GZIPCodec.java b/src/com/kenai/jbosh/GZIPCodec.java new file mode 100644 index 0000000..988f27f --- /dev/null +++ b/src/com/kenai/jbosh/GZIPCodec.java @@ -0,0 +1,104 @@ +/* + * Copyright 2009 Mike Cumings + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package com.kenai.jbosh; + +import java.io.ByteArrayInputStream; +import java.io.ByteArrayOutputStream; +import java.io.IOException; +import java.util.zip.GZIPInputStream; +import java.util.zip.GZIPOutputStream; + +/** + * Codec methods for compressing and uncompressing using GZIP. + */ +final class GZIPCodec { + + /** + * Size of the internal buffer when decoding. + */ + private static final int BUFFER_SIZE = 512; + + /////////////////////////////////////////////////////////////////////////// + // Constructors: + + /** + * Prevent construction. + */ + private GZIPCodec() { + // Empty + } + + /** + * Returns the name of the codec. + * + * @return string name of the codec (i.e., "gzip") + */ + public static String getID() { + return "gzip"; + } + + /** + * Compress/encode the data provided using the GZIP format. + * + * @param data data to compress + * @return compressed data + * @throws IOException on compression failure + */ + public static byte[] encode(final byte[] data) throws IOException { + ByteArrayOutputStream byteOut = new ByteArrayOutputStream(); + GZIPOutputStream gzOut = null; + try { + gzOut = new GZIPOutputStream(byteOut); + gzOut.write(data); + gzOut.close(); + byteOut.close(); + return byteOut.toByteArray(); + } finally { + gzOut.close(); + byteOut.close(); + } + } + + /** + * Uncompress/decode the data provided using the GZIP format. + * + * @param data data to uncompress + * @return uncompressed data + * @throws IOException on decompression failure + */ + public static byte[] decode(final byte[] compressed) throws IOException { + ByteArrayInputStream byteIn = new ByteArrayInputStream(compressed); + ByteArrayOutputStream byteOut = new ByteArrayOutputStream(); + GZIPInputStream gzIn = null; + try { + gzIn = new GZIPInputStream(byteIn); + int read; + byte[] buffer = new byte[BUFFER_SIZE]; + do { + read = gzIn.read(buffer); + if (read > 0) { + byteOut.write(buffer, 0, read); + } + } while (read >= 0); + return byteOut.toByteArray(); + } finally { + gzIn.close(); + byteOut.close(); + } + } + +} |