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Diffstat (limited to 'src/org/apache/http/impl/io/ContentLengthInputStream.java')
| -rw-r--r-- | src/org/apache/http/impl/io/ContentLengthInputStream.java | 220 |
1 files changed, 0 insertions, 220 deletions
diff --git a/src/org/apache/http/impl/io/ContentLengthInputStream.java b/src/org/apache/http/impl/io/ContentLengthInputStream.java deleted file mode 100644 index 3b19c5b..0000000 --- a/src/org/apache/http/impl/io/ContentLengthInputStream.java +++ /dev/null @@ -1,220 +0,0 @@ -/* - * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/impl/io/ContentLengthInputStream.java $ - * $Revision: 652091 $ - * $Date: 2008-04-29 13:41:07 -0700 (Tue, 29 Apr 2008) $ - * - * ==================================================================== - * Licensed to the Apache Software Foundation (ASF) under one - * or more contributor license agreements. See the NOTICE file - * distributed with this work for additional information - * regarding copyright ownership. The ASF licenses this file - * to you 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. - * ==================================================================== - * - * This software consists of voluntary contributions made by many - * individuals on behalf of the Apache Software Foundation. For more - * information on the Apache Software Foundation, please see - * <http://www.apache.org/>. - * - */ - -package org.apache.http.impl.io; - -import java.io.IOException; -import java.io.InputStream; - -import org.apache.http.io.SessionInputBuffer; - -/** - * Stream that cuts off after a specified number of bytes. - * 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. - * - * <p>Implementation note: Choices abound. One approach would pass - * through the {@link InputStream#mark} and {@link InputStream#reset} calls to - * the underlying stream. That's tricky, though, because you then have to - * start duplicating the work of keeping track of how much a reset rewinds. - * Further, you have to watch out for the "readLimit", and since the semantics - * for the readLimit leave room for differing implementations, you might get - * into a lot of trouble.</p> - * - * <p>Alternatively, you could make this class extend - * {@link java.io.BufferedInputStream} - * and then use the protected members of that class to avoid duplicated effort. - * That solution has the side effect of adding yet another possible layer of - * buffering.</p> - * - * <p>Then, there is the simple choice, which this takes - simply don't - * support {@link InputStream#mark} and {@link InputStream#reset}. That choice - * has the added benefit of keeping this class very simple.</p> - * - * @author Ortwin Glueck - * @author Eric Johnson - * @author <a href="mailto:mbowler@GargoyleSoftware.com">Mike Bowler</a> - * - * @since 4.0 - */ -public class ContentLengthInputStream extends InputStream { - - private static final int BUFFER_SIZE = 2048; - /** - * The maximum number of bytes that can be read from the stream. Subsequent - * read operations will return -1. - */ - private long contentLength; - - /** The current position */ - private long pos = 0; - - /** True if the stream is closed. */ - private boolean closed = false; - - /** - * Wrapped input stream that all calls are delegated to. - */ - private SessionInputBuffer in = null; - - /** - * Creates a new length limited stream - * - * @param in The session input buffer to wrap - * @param contentLength The maximum number of bytes that can be read from - * the stream. Subsequent read operations will return -1. - */ - public ContentLengthInputStream(final SessionInputBuffer in, long contentLength) { - super(); - if (in == null) { - throw new IllegalArgumentException("Input stream may not be null"); - } - if (contentLength < 0) { - throw new IllegalArgumentException("Content length may not be negative"); - } - this.in = in; - this.contentLength = contentLength; - } - - /** - * <p>Reads until the end of the known length of content.</p> - * - * <p>Does not close the underlying socket input, but instead leaves it - * primed to parse the next response.</p> - * @throws IOException If an IO problem occurs. - */ - public void close() throws IOException { - if (!closed) { - try { - byte buffer[] = new byte[BUFFER_SIZE]; - while (read(buffer) >= 0) { - } - } finally { - // close after above so that we don't throw an exception trying - // to read after closed! - closed = true; - } - } - } - - - /** - * Read the next byte from the stream - * @return The next byte or -1 if the end of stream has been reached. - * @throws IOException If an IO problem occurs - * @see java.io.InputStream#read() - */ - public int read() throws IOException { - if (closed) { - throw new IOException("Attempted read from closed stream."); - } - - if (pos >= contentLength) { - return -1; - } - pos++; - return this.in.read(); - } - - /** - * Does standard {@link InputStream#read(byte[], int, int)} behavior, but - * also notifies the watcher when the contents have been consumed. - * - * @param b The byte array to fill. - * @param off Start filling at this position. - * @param len The number of bytes to attempt to read. - * @return The number of bytes read, or -1 if the end of content has been - * reached. - * - * @throws java.io.IOException Should an error occur on the wrapped stream. - */ - public int read (byte[] b, int off, int len) throws java.io.IOException { - if (closed) { - throw new IOException("Attempted read from closed stream."); - } - - if (pos >= contentLength) { - return -1; - } - - if (pos + len > contentLength) { - len = (int) (contentLength - pos); - } - int count = this.in.read(b, off, len); - pos += count; - return count; - } - - - /** - * Read more bytes from the stream. - * @param b The byte array to put the new data in. - * @return The number of bytes read into the buffer. - * @throws IOException If an IO problem occurs - * @see java.io.InputStream#read(byte[]) - */ - public int read(byte[] b) throws IOException { - return read(b, 0, b.length); - } - - /** - * Skips and discards a number of bytes from the input stream. - * @param n The number of bytes to skip. - * @return The actual number of bytes skipped. <= 0 if no bytes - * are skipped. - * @throws IOException If an error occurs while skipping bytes. - * @see InputStream#skip(long) - */ - public long skip(long n) throws IOException { - if (n <= 0) { - return 0; - } - byte[] buffer = new byte[BUFFER_SIZE]; - // make sure we don't skip more bytes than are - // still available - long remaining = Math.min(n, this.contentLength - this.pos); - // skip and keep track of the bytes actually skipped - long count = 0; - while (remaining > 0) { - int l = read(buffer, 0, (int)Math.min(BUFFER_SIZE, remaining)); - if (l == -1) { - break; - } - count += l; - remaining -= l; - } - this.pos += count; - return count; - } -} |