| /* |
| * Copyright (C) 2010 The Android Open Source Project |
| * |
| * 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 libcore.net.http; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.net.CacheRequest; |
| import java.util.Arrays; |
| |
| /** |
| * An HTTP body with a fixed length specified in advance. |
| */ |
| final class FixedLengthInputStream extends AbstractHttpInputStream { |
| private int bytesRemaining; |
| |
| public FixedLengthInputStream(InputStream is, CacheRequest cacheRequest, |
| HttpEngine httpEngine, int length) throws IOException { |
| super(is, httpEngine, cacheRequest); |
| bytesRemaining = length; |
| if (bytesRemaining == 0) { |
| endOfInput(true); |
| } |
| } |
| |
| @Override public int read(byte[] buffer, int offset, int count) throws IOException { |
| Arrays.checkOffsetAndCount(buffer.length, offset, count); |
| checkNotClosed(); |
| if (bytesRemaining == 0) { |
| return -1; |
| } |
| int read = in.read(buffer, offset, Math.min(count, bytesRemaining)); |
| if (read == -1) { |
| unexpectedEndOfInput(); // the server didn't supply the promised content length |
| throw new IOException("unexpected end of stream"); |
| } |
| bytesRemaining -= read; |
| cacheWrite(buffer, offset, read); |
| if (bytesRemaining == 0) { |
| endOfInput(true); |
| } |
| return read; |
| } |
| |
| @Override public int available() throws IOException { |
| checkNotClosed(); |
| return bytesRemaining == 0 ? 0 : Math.min(in.available(), bytesRemaining); |
| } |
| |
| @Override public void close() throws IOException { |
| if (closed) { |
| return; |
| } |
| closed = true; |
| if (bytesRemaining != 0) { |
| unexpectedEndOfInput(); |
| } |
| } |
| } |