1f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project/* Copyright (C) 2003 Vladimir Roubtsov. All rights reserved. 2f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project * 3f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project * This program and the accompanying materials are made available under 4f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project * the terms of the Common Public License v1.0 which accompanies this distribution, 5f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project * and is available at http://www.eclipse.org/legal/cpl-v10.html 6f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project * 7f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project * $Id: ByteArrayIStream.java,v 1.1.1.1 2004/05/09 16:57:51 vlad_r Exp $ 8f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project */ 9f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Projectpackage com.vladium.util; 10f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 11f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Projectimport java.io.InputStream; 12f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 13f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Projectimport com.vladium.util.asserts.$assert; 14f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 15f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project// ---------------------------------------------------------------------------- 16f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project/** 17f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project * An unsynchronized version of java.io.ByteArrayInputStream.<p> 18f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project * 19f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project * All argument validation is disabled in release mode.<p> 20f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project * 21f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project * @author (C) 2001, Vlad Roubtsov 22f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project */ 23f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Projectpublic 24f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Projectfinal class ByteArrayIStream extends InputStream 25f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project{ 26f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project // public: ................................................................ 27f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 28f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 29f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project public ByteArrayIStream (final byte [] buf) 30f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project { 31f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project this (buf, buf.length); 32f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project } 33f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 34f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project public ByteArrayIStream (final byte [] buf, final int length) 35f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project { 36f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project if ($assert.ENABLED) $assert.ASSERT ((length >= 0) && (length <= buf.length), 37f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project "invalid length: " + length); 38f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 39f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project m_buf = buf; 40f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project m_max = length; 41f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project } 42f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 43f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project // InputStream: 44f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 45f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project public final int read () 46f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project { 47f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project if (m_pos >= m_max) 48f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project return -1; 49f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project else 50f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project return 0xFF & m_buf [m_pos ++]; 51f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project } 52f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 53f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project public final int read (final byte [] buf, final int offset, int length) 54f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project { 55f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project if ($assert.ENABLED) 56f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project $assert.ASSERT ((offset >= 0) && (offset <= buf.length) && 57f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project (length >= 0) && ((offset + length) <= buf.length), 58f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project "invalid input (" + buf.length + ", " + offset + ", " + length + ")"); 59f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 60f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project final int pos = m_pos; 61f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project final int max = m_max; 62f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 63f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project if (pos >= max) return -1; 64f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project if (pos + length > max) length = max - pos; 65f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project if (length <= 0) return 0; 66f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 67f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project final byte [] mbuf = m_buf; 68f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 69f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project if (length < NATIVE_COPY_THRESHOLD) 70f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project for (int i = 0; i < length; ++ i) buf [offset + i] = mbuf [pos + i]; 71f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project else 72f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project System.arraycopy (mbuf, pos, buf, offset, length); 73f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 74f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project m_pos += length; 75f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 76f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project return length; 77f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project } 78f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 79f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project public final int available () 80f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project { 81f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project return m_max - m_pos; 82f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project } 83f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 84f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project public final long skip (long n) 85f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project { 86f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project if (m_pos + n > m_max) n = m_max - m_pos; 87f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 88f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project if (n < 0) return 0; 89f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project m_pos += n; 90f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 91f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project return n; 92f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project } 93f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 94f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project /** 95f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project * Differs from the contruct for InputStream.reset() in that this method 96f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project * always resets the stream to the same it was immediately after creation. 97f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project */ 98f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project public final void reset () 99f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project { 100f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project m_pos = 0; 101f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project } 102f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 103f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project /** 104f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project * Equivalent to {@link #reset()}. 105f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project */ 106f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project public final void close () 107f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project { 108f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project reset (); 109f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project } 110f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 111f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project // protected: ............................................................. 112f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 113f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project // package: ............................................................... 114f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 115f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project // private: ............................................................... 116f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 117f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 118f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project private final byte [] m_buf; 119f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project private final int m_max; 120f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project private int m_pos; 121f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 122f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project private static final int NATIVE_COPY_THRESHOLD = 9; 123f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project 124f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project} // end of class 125f6fe897e173f4e4bda72a7dddb091b667066764aThe Android Open Source Project// ----------------------------------------------------------------------------