| /* |
| * Copyright (C) 2010, Google Inc. and others |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Distribution License v. 1.0 which is available at |
| * https://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| package org.eclipse.jgit.lib; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| /** |
| * Stream of data coming from an object loaded by {@link org.eclipse.jgit.lib.ObjectLoader}. |
| */ |
| public abstract class ObjectStream extends InputStream { |
| /** |
| * Get Git object type, see {@link Constants}. |
| * |
| * @return Git object type, see {@link Constants}. |
| */ |
| public abstract int getType(); |
| |
| /** |
| * Get total size of object in bytes |
| * |
| * @return total size of object in bytes |
| */ |
| public abstract long getSize(); |
| |
| /** |
| * Simple stream around the cached byte array created by a loader. |
| * <p> |
| * ObjectLoader implementations can use this stream type when the object's |
| * content is small enough to be accessed as a single byte array, but the |
| * application has still requested it in stream format. |
| */ |
| public static class SmallStream extends ObjectStream { |
| private final int type; |
| |
| private final byte[] data; |
| |
| private int ptr; |
| |
| private int mark; |
| |
| /** |
| * Create the stream from an existing loader's cached bytes. |
| * |
| * @param loader |
| * the loader. |
| */ |
| public SmallStream(ObjectLoader loader) { |
| this(loader.getType(), loader.getCachedBytes()); |
| } |
| |
| /** |
| * Create the stream from an existing byte array and type. |
| * |
| *@param type |
| * the type constant for the object. |
| *@param data |
| * the fully inflated content of the object. |
| */ |
| public SmallStream(int type, byte[] data) { |
| this.type = type; |
| this.data = data; |
| } |
| |
| @Override |
| public int getType() { |
| return type; |
| } |
| |
| @Override |
| public long getSize() { |
| return data.length; |
| } |
| |
| @Override |
| public int available() { |
| return data.length - ptr; |
| } |
| |
| @Override |
| public long skip(long n) { |
| int s = (int) Math.min(available(), Math.max(0, n)); |
| ptr += s; |
| return s; |
| } |
| |
| @Override |
| public int read() { |
| if (ptr == data.length) |
| return -1; |
| return data[ptr++] & 0xff; |
| } |
| |
| @Override |
| public int read(byte[] b, int off, int len) { |
| if (ptr == data.length) |
| return -1; |
| int n = Math.min(available(), len); |
| System.arraycopy(data, ptr, b, off, n); |
| ptr += n; |
| return n; |
| } |
| |
| @Override |
| public boolean markSupported() { |
| return true; |
| } |
| |
| @Override |
| public void mark(int readlimit) { |
| mark = ptr; |
| } |
| |
| @Override |
| public void reset() { |
| ptr = mark; |
| } |
| } |
| |
| /** |
| * Simple filter stream around another stream. |
| * <p> |
| * ObjectLoader implementations can use this stream type when the object's |
| * content is available from a standard InputStream. |
| */ |
| public static class Filter extends ObjectStream { |
| private final int type; |
| |
| private final long size; |
| |
| private final InputStream in; |
| |
| /** |
| * Create a filter stream for an object. |
| * |
| * @param type |
| * the type of the object. |
| * @param size |
| * total size of the object, in bytes. |
| * @param in |
| * stream the object's raw data is available from. This |
| * stream should be buffered with some reasonable amount of |
| * buffering. |
| */ |
| public Filter(int type, long size, InputStream in) { |
| this.type = type; |
| this.size = size; |
| this.in = in; |
| } |
| |
| @Override |
| public int getType() { |
| return type; |
| } |
| |
| @Override |
| public long getSize() { |
| return size; |
| } |
| |
| @Override |
| public int available() throws IOException { |
| return in.available(); |
| } |
| |
| @Override |
| public long skip(long n) throws IOException { |
| return in.skip(n); |
| } |
| |
| @Override |
| public int read() throws IOException { |
| return in.read(); |
| } |
| |
| @Override |
| public int read(byte[] b, int off, int len) throws IOException { |
| return in.read(b, off, len); |
| } |
| |
| @Override |
| public boolean markSupported() { |
| return in.markSupported(); |
| } |
| |
| @Override |
| public void mark(int readlimit) { |
| in.mark(readlimit); |
| } |
| |
| @Override |
| public void reset() throws IOException { |
| in.reset(); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| in.close(); |
| } |
| } |
| } |