| /* |
| * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| */ |
| package java.net.http; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| |
| /** |
| * Implements chunked/fixed transfer encodings of HTTP/1.1 responses. |
| */ |
| class ResponseContent { |
| |
| final HttpResponse.BodyProcessor<?> userProcessor; |
| final HttpResponse.BodyProcessor<?> pusher; |
| final HttpConnection connection; |
| final int contentLength; |
| ByteBuffer buffer; |
| ByteBuffer lastBufferUsed; |
| final ResponseHeaders headers; |
| final Http1Response.FlowController flowController; |
| |
| ResponseContent(HttpConnection connection, |
| int contentLength, |
| ResponseHeaders h, |
| HttpResponse.BodyProcessor<?> userProcessor, |
| Http1Response.FlowController flowController) { |
| this.userProcessor = userProcessor; |
| this.pusher = (HttpResponse.BodyProcessor)userProcessor; |
| this.connection = connection; |
| this.contentLength = contentLength; |
| this.headers = h; |
| this.flowController = flowController; |
| } |
| |
| static final int LF = 10; |
| static final int CR = 13; |
| static final int SP = 0x20; |
| static final int BUF_SIZE = 1024; |
| |
| boolean chunkedContent, chunkedContentInitialized; |
| |
| private boolean contentChunked() throws IOException { |
| if (chunkedContentInitialized) { |
| return chunkedContent; |
| } |
| if (contentLength == -1) { |
| String tc = headers.firstValue("Transfer-Encoding") |
| .orElse(""); |
| if (!tc.equals("")) { |
| if (tc.equalsIgnoreCase("chunked")) { |
| chunkedContent = true; |
| } else { |
| throw new IOException("invalid content"); |
| } |
| } else { |
| chunkedContent = false; |
| } |
| } |
| chunkedContentInitialized = true; |
| return chunkedContent; |
| } |
| |
| /** |
| * Entry point for pusher. b is an initial ByteBuffer that may |
| * have some data in it. When this method returns, the body |
| * has been fully processed. |
| */ |
| void pushBody(ByteBuffer b) throws IOException { |
| // TODO: check status |
| if (contentChunked()) { |
| pushBodyChunked(b); |
| } else { |
| pushBodyFixed(b); |
| } |
| } |
| |
| // reads and returns chunklen. Position of chunkbuf is first byte |
| // of chunk on return. chunklen includes the CR LF at end of chunk |
| int readChunkLen() throws IOException { |
| chunklen = 0; |
| boolean cr = false; |
| while (true) { |
| getHunk(); |
| int c = chunkbuf.get(); |
| if (cr) { |
| if (c == LF) { |
| return chunklen + 2; |
| } else { |
| throw new IOException("invalid chunk header"); |
| } |
| } |
| if (c == CR) { |
| cr = true; |
| } else { |
| int digit = toDigit(c); |
| chunklen = chunklen * 16 + digit; |
| } |
| } |
| } |
| |
| int chunklen = -1; // number of bytes in chunk (fixed) |
| int bytesremaining; // number of bytes in chunk left to be read incl CRLF |
| int bytesread; |
| ByteBuffer chunkbuf; // initialise |
| |
| // make sure we have at least 1 byte to look at |
| private void getHunk() throws IOException { |
| while (chunkbuf == null || !chunkbuf.hasRemaining()) { |
| |
| if (chunkbuf != null) { |
| connection.returnBuffer(chunkbuf); |
| } |
| chunkbuf = connection.read(); |
| } |
| } |
| |
| private void consumeBytes(int n) throws IOException { |
| getHunk(); |
| while (n > 0) { |
| int e = Math.min(chunkbuf.remaining(), n); |
| chunkbuf.position(chunkbuf.position() + e); |
| n -= e; |
| if (n > 0) |
| getHunk(); |
| } |
| } |
| |
| /** |
| * Returns a ByteBuffer containing a chunk of data or a "hunk" of data |
| * (a chunk of a chunk if the chunk size is larger than our ByteBuffers). |
| */ |
| ByteBuffer readChunkedBuffer() throws IOException { |
| if (chunklen == -1) { |
| // new chunk |
| bytesremaining = readChunkLen(); |
| chunklen = bytesremaining - 2; |
| if (chunklen == 0) { |
| consumeBytes(2); |
| return null; |
| } |
| } |
| |
| getHunk(); |
| bytesread = chunkbuf.remaining(); |
| ByteBuffer returnBuffer; |
| |
| /** |
| * Cases. Always at least one byte is read by getHunk() |
| * |
| * 1) one read contains exactly 1 chunk. Strip off CRLF and pass buffer on |
| * 2) one read contains a hunk. If at end of chunk, consume CRLF.Pass buffer up. |
| * 3) read contains rest of chunk and more data. Copy buffer. |
| */ |
| if (bytesread == bytesremaining) { |
| // common case: 1 read = 1 chunk (or final hunk of chunk) |
| chunkbuf.limit(chunkbuf.limit() - 2); // remove trailing CRLF |
| bytesremaining = 0; |
| returnBuffer = chunkbuf; |
| chunkbuf = null; |
| chunklen = -1; |
| } else if (bytesread < bytesremaining) { |
| // read a hunk, maybe including CR or LF or both |
| bytesremaining -= bytesread; |
| if (bytesremaining <= 2) { |
| // remove any trailing CR LF already read, and then read the rest |
| chunkbuf.limit(chunkbuf.limit() - (2 - bytesremaining)); |
| consumeBytes(bytesremaining); |
| chunklen = -1; |
| } |
| returnBuffer = chunkbuf; |
| chunkbuf = null; |
| } else { |
| // bytesread > bytesremaining |
| returnBuffer = splitChunkedBuffer(bytesremaining-2); |
| bytesremaining = 0; |
| chunklen = -1; |
| consumeBytes(2); |
| } |
| return returnBuffer; |
| } |
| |
| ByteBuffer initialBuffer; |
| int fixedBytesReturned; |
| |
| ByteBuffer getResidue() { |
| return lastBufferUsed; |
| } |
| |
| private void compactBuffer(ByteBuffer buf) { |
| buf.compact() |
| .flip(); |
| } |
| |
| /** |
| * Copies inbuf (numBytes from its position) to new buffer. The returned |
| * buffer's position is zero and limit is at end (numBytes) |
| */ |
| private ByteBuffer copyBuffer(ByteBuffer inbuf, int numBytes) { |
| ByteBuffer b1 = connection.getBuffer(); |
| assert b1.remaining() >= numBytes; |
| byte[] b = b1.array(); |
| inbuf.get(b, 0, numBytes); |
| b1.limit(numBytes); |
| return b1; |
| } |
| |
| /** |
| * Split numBytes of data out of chunkbuf from the remainder, |
| * copying whichever part is smaller. chunkbuf points to second part |
| * of buffer on return. The returned buffer is the data from position |
| * to position + numBytes. Both buffers positions are reset so same |
| * data can be re-read. |
| */ |
| private ByteBuffer splitChunkedBuffer(int numBytes) { |
| ByteBuffer newbuf = connection.getBuffer(); |
| byte[] b = newbuf.array(); |
| int midpoint = chunkbuf.position() + numBytes; |
| int remainder = chunkbuf.limit() - midpoint; |
| |
| if (numBytes < remainder) { |
| // copy first part of chunkbuf to new buf |
| chunkbuf.get(b, 0, numBytes); |
| newbuf.limit(numBytes); |
| return newbuf; |
| } else { |
| // copy remainder of chunkbuf to newbuf and make newbuf chunkbuf |
| chunkbuf.mark(); |
| chunkbuf.position(midpoint); |
| chunkbuf.get(b, 0, remainder); |
| chunkbuf.reset(); |
| chunkbuf.limit(midpoint); |
| newbuf.limit(remainder); |
| newbuf.position(0); |
| ByteBuffer tmp = chunkbuf; |
| chunkbuf = newbuf; |
| return tmp; |
| } |
| } |
| |
| private void pushBodyChunked(ByteBuffer b) throws IOException { |
| chunkbuf = b; |
| while (true) { |
| ByteBuffer b1 = readChunkedBuffer(); |
| if (b1 != null) { |
| if (b1.hasRemaining()) { |
| request(1); // wait till we can send |
| pusher.onResponseBodyChunk(b1); |
| lastBufferUsed = b1; |
| } |
| } else { |
| return; |
| } |
| } |
| } |
| |
| private int toDigit(int b) throws IOException { |
| if (b >= 0x30 && b <= 0x39) { |
| return b - 0x30; |
| } |
| if (b >= 0x41 && b <= 0x46) { |
| return b - 0x41 + 10; |
| } |
| if (b >= 0x61 && b <= 0x66) { |
| return b - 0x61 + 10; |
| } |
| throw new IOException("Invalid chunk header byte " + b); |
| } |
| |
| private void request(long value) throws IOException { |
| try { |
| flowController.request(value); |
| } catch (InterruptedException e) { |
| throw new IOException(e); |
| } |
| } |
| |
| private void pushBodyFixed(ByteBuffer b) throws IOException { |
| lastBufferUsed = b; |
| for (int remaining = contentLength; remaining > 0;) { |
| int bufsize = b.remaining(); |
| if (bufsize > remaining) { |
| // more data available than required, must copy |
| lastBufferUsed = b; |
| b = copyBuffer(b, remaining); |
| remaining = 0; |
| } else { |
| // pass entire buffer up to user |
| remaining -= bufsize; |
| compactBuffer(b); |
| } |
| request(1); // wait till we can send |
| pusher.onResponseBodyChunk(b); |
| if (remaining > 0) { |
| b = connection.read(); |
| if (b == null) { |
| throw new IOException("Error reading response"); |
| } |
| lastBufferUsed = b; |
| } |
| } |
| } |
| } |