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author | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
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committer | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
commit | 5f8de423f190bbb79a62f804151bc24824fa32d8 (patch) | |
tree | 10027f336435511475e392454359edea8e25895d /mobile/android/thirdparty/ch/boye/httpclientandroidlib/impl/io/ChunkedInputStream.java | |
parent | 49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff) | |
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Add m-esr52 at 52.6.0
Diffstat (limited to 'mobile/android/thirdparty/ch/boye/httpclientandroidlib/impl/io/ChunkedInputStream.java')
-rw-r--r-- | mobile/android/thirdparty/ch/boye/httpclientandroidlib/impl/io/ChunkedInputStream.java | 301 |
1 files changed, 301 insertions, 0 deletions
diff --git a/mobile/android/thirdparty/ch/boye/httpclientandroidlib/impl/io/ChunkedInputStream.java b/mobile/android/thirdparty/ch/boye/httpclientandroidlib/impl/io/ChunkedInputStream.java new file mode 100644 index 000000000..447bd676d --- /dev/null +++ b/mobile/android/thirdparty/ch/boye/httpclientandroidlib/impl/io/ChunkedInputStream.java @@ -0,0 +1,301 @@ +/* + * ==================================================================== + * 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.Header; +import ch.boye.httpclientandroidlib.HttpException; +import ch.boye.httpclientandroidlib.MalformedChunkCodingException; +import ch.boye.httpclientandroidlib.TruncatedChunkException; +import ch.boye.httpclientandroidlib.annotation.NotThreadSafe; +import ch.boye.httpclientandroidlib.io.BufferInfo; +import ch.boye.httpclientandroidlib.io.SessionInputBuffer; +import ch.boye.httpclientandroidlib.util.Args; +import ch.boye.httpclientandroidlib.util.CharArrayBuffer; + +/** + * Implements chunked transfer coding. The content is received in small chunks. + * Entities transferred using this input stream can be of unlimited length. + * After the stream is read to the end, it provides access to the trailers, + * if any. + * <p> + * 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. + * + * + * @since 4.0 + * + */ +@NotThreadSafe +public class ChunkedInputStream extends InputStream { + + private static final int CHUNK_LEN = 1; + private static final int CHUNK_DATA = 2; + private static final int CHUNK_CRLF = 3; + + private static final int BUFFER_SIZE = 2048; + + /** The session input buffer */ + private final SessionInputBuffer in; + + private final CharArrayBuffer buffer; + + private int state; + + /** The chunk size */ + private int chunkSize; + + /** The current position within the current chunk */ + private int pos; + + /** True if we've reached the end of stream */ + private boolean eof = false; + + /** True if this stream is closed */ + private boolean closed = false; + + private Header[] footers = new Header[] {}; + + /** + * Wraps session input stream and reads chunk coded input. + * + * @param in The session input buffer + */ + public ChunkedInputStream(final SessionInputBuffer in) { + super(); + this.in = Args.notNull(in, "Session input buffer"); + this.pos = 0; + this.buffer = new CharArrayBuffer(16); + this.state = CHUNK_LEN; + } + + @Override + public int available() throws IOException { + if (this.in instanceof BufferInfo) { + final int len = ((BufferInfo) this.in).length(); + return Math.min(len, this.chunkSize - this.pos); + } else { + return 0; + } + } + + /** + * <p> Returns all the data in a chunked stream in coalesced form. A chunk + * is followed by a CRLF. The method returns -1 as soon as a chunksize of 0 + * is detected.</p> + * + * <p> Trailer headers are read automatically at the end of the stream and + * can be obtained with the getResponseFooters() method.</p> + * + * @return -1 of the end of the stream has been reached or the next data + * byte + * @throws IOException in case of an I/O error + */ + @Override + public int read() throws IOException { + if (this.closed) { + throw new IOException("Attempted read from closed stream."); + } + if (this.eof) { + return -1; + } + if (state != CHUNK_DATA) { + nextChunk(); + if (this.eof) { + return -1; + } + } + final int b = in.read(); + if (b != -1) { + pos++; + if (pos >= chunkSize) { + state = CHUNK_CRLF; + } + } + return b; + } + + /** + * Read some bytes from the stream. + * @param b The byte array that will hold the contents from the stream. + * @param off The offset into the byte array at which bytes will start to be + * placed. + * @param len the maximum number of bytes that can be returned. + * @return The number of bytes returned or -1 if the end of stream has been + * reached. + * @throws IOException in case of an I/O error + */ + @Override + public int read (final byte[] b, final int off, final int len) throws IOException { + + if (closed) { + throw new IOException("Attempted read from closed stream."); + } + + if (eof) { + return -1; + } + if (state != CHUNK_DATA) { + nextChunk(); + if (eof) { + return -1; + } + } + final int bytesRead = in.read(b, off, Math.min(len, chunkSize - pos)); + if (bytesRead != -1) { + pos += bytesRead; + if (pos >= chunkSize) { + state = CHUNK_CRLF; + } + return bytesRead; + } else { + eof = true; + throw new TruncatedChunkException("Truncated chunk " + + "( expected size: " + chunkSize + + "; actual size: " + pos + ")"); + } + } + + /** + * Read some bytes from the stream. + * @param b The byte array that will hold the contents from the stream. + * @return The number of bytes returned or -1 if the end of stream has been + * reached. + * @throws IOException in case of an I/O error + */ + @Override + public int read (final byte[] b) throws IOException { + return read(b, 0, b.length); + } + + /** + * Read the next chunk. + * @throws IOException in case of an I/O error + */ + private void nextChunk() throws IOException { + chunkSize = getChunkSize(); + if (chunkSize < 0) { + throw new MalformedChunkCodingException("Negative chunk size"); + } + state = CHUNK_DATA; + pos = 0; + if (chunkSize == 0) { + eof = true; + parseTrailerHeaders(); + } + } + + /** + * Expects the stream to start with a chunksize in hex with optional + * comments after a semicolon. The line must end with a CRLF: "a3; some + * comment\r\n" Positions the stream at the start of the next line. + */ + private int getChunkSize() throws IOException { + final int st = this.state; + switch (st) { + case CHUNK_CRLF: + this.buffer.clear(); + final int bytesRead1 = this.in.readLine(this.buffer); + if (bytesRead1 == -1) { + return 0; + } + if (!this.buffer.isEmpty()) { + throw new MalformedChunkCodingException( + "Unexpected content at the end of chunk"); + } + state = CHUNK_LEN; + //$FALL-THROUGH$ + case CHUNK_LEN: + this.buffer.clear(); + final int bytesRead2 = this.in.readLine(this.buffer); + if (bytesRead2 == -1) { + return 0; + } + int separator = this.buffer.indexOf(';'); + if (separator < 0) { + separator = this.buffer.length(); + } + try { + return Integer.parseInt(this.buffer.substringTrimmed(0, separator), 16); + } catch (final NumberFormatException e) { + throw new MalformedChunkCodingException("Bad chunk header"); + } + default: + throw new IllegalStateException("Inconsistent codec state"); + } + } + + /** + * Reads and stores the Trailer headers. + * @throws IOException in case of an I/O error + */ + private void parseTrailerHeaders() throws IOException { + try { + this.footers = AbstractMessageParser.parseHeaders + (in, -1, -1, null); + } catch (final HttpException ex) { + final IOException ioe = new MalformedChunkCodingException("Invalid footer: " + + ex.getMessage()); + ioe.initCause(ex); + throw ioe; + } + } + + /** + * Upon close, this reads the remainder of the chunked message, + * leaving the underlying socket at a position to start reading the + * next response without scanning. + * @throws IOException in case of an I/O error + */ + @Override + public void close() throws IOException { + if (!closed) { + try { + if (!eof) { + // read and discard the remainder of the message + final byte buff[] = new byte[BUFFER_SIZE]; + while (read(buff) >= 0) { + } + } + } finally { + eof = true; + closed = true; + } + } + } + + public Header[] getFooters() { + return this.footers.clone(); + } + +} |