The Tor Browser: comparison mobile/android/thirdparty/ch/boye/httpclientandroidlib/impl/io/ContentLengthInputStream.java

--1:000000000000
+:b77a8268fd00
+/*
+* ====================================================================
+* 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 ch.boye.httpclientandroidlib.impl.io;
+import java.io.IOException;
+import java.io.InputStream;
+import ch.boye.httpclientandroidlib.ConnectionClosedException;
+import ch.boye.httpclientandroidlib.io.BufferInfo;
+import ch.boye.httpclientandroidlib.io.SessionInputBuffer;
+/**
+* Input stream that cuts off after a defined number of bytes. This class
+* is used to receive content of HTTP messages where the end of the content
+* entity is determined by the value of the <code>Content-Length header</code>.
+* Entities transferred using this stream can be maximum {@link Long#MAX_VALUE}
+* long.
+* <p>
+* Note that this class NEVER closes the underlying stream, even when close
+* gets called.  Instead, it will read until the "end" of its limit 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.
+*
+*
+* @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;
+/**
+* Wraps a session input buffer and cuts off output after a defined number
+* of bytes.
+*
+* @param in The session input buffer
+* @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 {
+if (pos < contentLength) {
+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;
+}
+}
+}
+public int available() throws IOException {
+if (this.in instanceof BufferInfo) {
+int len = ((BufferInfo) this.in).length();
+return Math.min(len, (int) (this.contentLength - this.pos));
+} else {
+return 0;
+}
+}
+/**
+* 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;
+}
+int b = this.in.read();
+if (b == -1) {
+if (pos < contentLength) {
+throw new ConnectionClosedException(
+"Premature end of Content-Length delimited message body (expected: "
++ contentLength + "; received: " + pos);
+}
+} else {
+pos++;
+}
+return b;
+}
+/**
+* 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);
+if (count == -1 && pos < contentLength) {
+throw new ConnectionClosedException(
+"Premature end of Content-Length delimited message body (expected: "
++ contentLength + "; received: " + pos);
+}
+if (count > 0) {
+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;
+}
+return count;
+}
+}

The Tor Browser / file comparison

comparison: mobile/android/thirdparty/ch/boye/httpclientandroidlib/impl/io/ContentLengthInputStream.java

mobile/android/thirdparty/ch/boye/httpclientandroidlib/impl/io/ContentLengthInputStream.java