| /* GENERATED SOURCE. DO NOT MODIFY. */ |
| /* |
| * Copyright (C) 2014 Square, Inc. |
| * |
| * 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 com.android.okhttp.okio; |
| |
| import java.io.EOFException; |
| import java.io.IOException; |
| import java.util.zip.DataFormatException; |
| import java.util.zip.Inflater; |
| |
| /** |
| * A source that uses <a href="http://tools.ietf.org/html/rfc1951">DEFLATE</a> |
| * to decompress data read from another source. |
| * @hide This class is not part of the Android public SDK API |
| */ |
| public final class InflaterSource implements Source { |
| private final BufferedSource source; |
| private final Inflater inflater; |
| |
| /** |
| * When we call Inflater.setInput(), the inflater keeps our byte array until |
| * it needs input again. This tracks how many bytes the inflater is currently |
| * holding on to. |
| */ |
| private int bufferBytesHeldByInflater; |
| private boolean closed; |
| |
| public InflaterSource(Source source, Inflater inflater) { |
| this(Okio.buffer(source), inflater); |
| } |
| |
| /** |
| * This package-private constructor shares a buffer with its trusted caller. |
| * In general we can't share a BufferedSource because the inflater holds input |
| * bytes until they are inflated. |
| */ |
| InflaterSource(BufferedSource source, Inflater inflater) { |
| if (source == null) throw new IllegalArgumentException("source == null"); |
| if (inflater == null) throw new IllegalArgumentException("inflater == null"); |
| this.source = source; |
| this.inflater = inflater; |
| } |
| |
| @Override public long read( |
| Buffer sink, long byteCount) throws IOException { |
| if (byteCount < 0) throw new IllegalArgumentException("byteCount < 0: " + byteCount); |
| if (closed) throw new IllegalStateException("closed"); |
| if (byteCount == 0) return 0; |
| |
| while (true) { |
| boolean sourceExhausted = refill(); |
| |
| // Decompress the inflater's compressed data into the sink. |
| try { |
| Segment tail = sink.writableSegment(1); |
| int bytesInflated = inflater.inflate(tail.data, tail.limit, Segment.SIZE - tail.limit); |
| if (bytesInflated > 0) { |
| tail.limit += bytesInflated; |
| sink.size += bytesInflated; |
| return bytesInflated; |
| } |
| if (inflater.finished() || inflater.needsDictionary()) { |
| releaseInflatedBytes(); |
| if (tail.pos == tail.limit) { |
| // We allocated a tail segment, but didn't end up needing it. Recycle! |
| sink.head = tail.pop(); |
| SegmentPool.recycle(tail); |
| } |
| return -1; |
| } |
| if (sourceExhausted) throw new EOFException("source exhausted prematurely"); |
| } catch (DataFormatException e) { |
| throw new IOException(e); |
| } |
| } |
| } |
| |
| /** |
| * Refills the inflater with compressed data if it needs input. (And only if |
| * it needs input). Returns true if the inflater required input but the source |
| * was exhausted. |
| */ |
| public boolean refill() throws IOException { |
| if (!inflater.needsInput()) return false; |
| |
| releaseInflatedBytes(); |
| if (inflater.getRemaining() != 0) throw new IllegalStateException("?"); // TODO: possible? |
| |
| // If there are compressed bytes in the source, assign them to the inflater. |
| if (source.exhausted()) return true; |
| |
| // Assign buffer bytes to the inflater. |
| Segment head = source.buffer().head; |
| bufferBytesHeldByInflater = head.limit - head.pos; |
| inflater.setInput(head.data, head.pos, bufferBytesHeldByInflater); |
| return false; |
| } |
| |
| /** When the inflater has processed compressed data, remove it from the buffer. */ |
| private void releaseInflatedBytes() throws IOException { |
| if (bufferBytesHeldByInflater == 0) return; |
| int toRelease = bufferBytesHeldByInflater - inflater.getRemaining(); |
| bufferBytesHeldByInflater -= toRelease; |
| source.skip(toRelease); |
| } |
| |
| @Override public Timeout timeout() { |
| return source.timeout(); |
| } |
| |
| @Override public void close() throws IOException { |
| if (closed) return; |
| inflater.end(); |
| closed = true; |
| source.close(); |
| } |
| } |