| /* |
| * Copyright (c) 2007, 2014, 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 |
| * questions. |
| */ |
| package com.sun.media.sound; |
| |
| import java.io.EOFException; |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| /** |
| * Resource Interchange File Format (RIFF) stream decoder. |
| * |
| * @author Karl Helgason |
| */ |
| public final class RIFFReader extends InputStream { |
| |
| private final RIFFReader root; |
| private long filepointer = 0; |
| private final String fourcc; |
| private String riff_type = null; |
| private long ckSize = Integer.MAX_VALUE; |
| private InputStream stream; |
| private long avail = Integer.MAX_VALUE; |
| private RIFFReader lastiterator = null; |
| |
| public RIFFReader(InputStream stream) throws IOException { |
| |
| if (stream instanceof RIFFReader) { |
| root = ((RIFFReader) stream).root; |
| } else { |
| root = this; |
| } |
| |
| this.stream = stream; |
| |
| // Check for RIFF null paddings, |
| int b; |
| while (true) { |
| b = read(); |
| if (b == -1) { |
| fourcc = ""; // don't put null value into fourcc, |
| // because it is expected to |
| // always contain a string value |
| riff_type = null; |
| avail = 0; |
| return; |
| } |
| if (b != 0) |
| break; |
| } |
| |
| byte[] fourcc = new byte[4]; |
| fourcc[0] = (byte) b; |
| readFully(fourcc, 1, 3); |
| this.fourcc = new String(fourcc, "ascii"); |
| ckSize = readUnsignedInt(); |
| avail = ckSize; |
| |
| if (getFormat().equals("RIFF") || getFormat().equals("LIST")) { |
| if (avail > Integer.MAX_VALUE) { |
| throw new RIFFInvalidDataException("Chunk size too big"); |
| } |
| byte[] format = new byte[4]; |
| readFully(format); |
| this.riff_type = new String(format, "ascii"); |
| } |
| } |
| |
| public long getFilePointer() throws IOException { |
| return root.filepointer; |
| } |
| |
| public boolean hasNextChunk() throws IOException { |
| if (lastiterator != null) |
| lastiterator.finish(); |
| return avail != 0; |
| } |
| |
| public RIFFReader nextChunk() throws IOException { |
| if (lastiterator != null) |
| lastiterator.finish(); |
| if (avail == 0) |
| return null; |
| lastiterator = new RIFFReader(this); |
| return lastiterator; |
| } |
| |
| public String getFormat() { |
| return fourcc; |
| } |
| |
| public String getType() { |
| return riff_type; |
| } |
| |
| public long getSize() { |
| return ckSize; |
| } |
| |
| public int read() throws IOException { |
| if (avail == 0) { |
| return -1; |
| } |
| int b = stream.read(); |
| if (b == -1) { |
| avail = 0; |
| return -1; |
| } |
| avail--; |
| filepointer++; |
| return b; |
| } |
| |
| public int read(byte[] b, int offset, int len) throws IOException { |
| if (avail == 0) { |
| return -1; |
| } |
| if (len > avail) { |
| int rlen = stream.read(b, offset, (int)avail); |
| if (rlen != -1) |
| filepointer += rlen; |
| avail = 0; |
| return rlen; |
| } else { |
| int ret = stream.read(b, offset, len); |
| if (ret == -1) { |
| avail = 0; |
| return -1; |
| } |
| avail -= ret; |
| filepointer += ret; |
| return ret; |
| } |
| } |
| |
| public void readFully(byte b[]) throws IOException { |
| readFully(b, 0, b.length); |
| } |
| |
| public void readFully(byte b[], int off, int len) throws IOException { |
| if (len < 0) |
| throw new IndexOutOfBoundsException(); |
| while (len > 0) { |
| int s = read(b, off, len); |
| if (s < 0) |
| throw new EOFException(); |
| if (s == 0) |
| Thread.yield(); |
| off += s; |
| len -= s; |
| } |
| } |
| |
| public long skipBytes(long n) throws IOException { |
| if (n < 0) |
| return 0; |
| long skipped = 0; |
| while (skipped != n) { |
| long s = skip(n - skipped); |
| if (s < 0) |
| break; |
| if (s == 0) |
| Thread.yield(); |
| skipped += s; |
| } |
| return skipped; |
| } |
| |
| public long skip(long n) throws IOException { |
| if (avail == 0) |
| return -1; |
| if (n > avail) { |
| long len = stream.skip(avail); |
| if (len != -1) |
| filepointer += len; |
| avail = 0; |
| return len; |
| } else { |
| long ret = stream.skip(n); |
| if (ret == -1) { |
| avail = 0; |
| return -1; |
| } |
| avail -= ret; |
| filepointer += ret; |
| return ret; |
| } |
| } |
| |
| public int available() { |
| return (int)avail; |
| } |
| |
| public void finish() throws IOException { |
| if (avail != 0) { |
| skipBytes(avail); |
| } |
| } |
| |
| // Read ASCII chars from stream |
| public String readString(final int len) throws IOException { |
| final byte[] buff; |
| try { |
| buff = new byte[len]; |
| } catch (final OutOfMemoryError oom) { |
| throw new IOException("Length too big", oom); |
| } |
| readFully(buff); |
| for (int i = 0; i < buff.length; i++) { |
| if (buff[i] == 0) { |
| return new String(buff, 0, i, "ascii"); |
| } |
| } |
| return new String(buff, "ascii"); |
| } |
| |
| // Read 8 bit signed integer from stream |
| public byte readByte() throws IOException { |
| int ch = read(); |
| if (ch < 0) |
| throw new EOFException(); |
| return (byte) ch; |
| } |
| |
| // Read 16 bit signed integer from stream |
| public short readShort() throws IOException { |
| int ch1 = read(); |
| int ch2 = read(); |
| if (ch1 < 0) |
| throw new EOFException(); |
| if (ch2 < 0) |
| throw new EOFException(); |
| return (short)(ch1 | (ch2 << 8)); |
| } |
| |
| // Read 32 bit signed integer from stream |
| public int readInt() throws IOException { |
| int ch1 = read(); |
| int ch2 = read(); |
| int ch3 = read(); |
| int ch4 = read(); |
| if (ch1 < 0) |
| throw new EOFException(); |
| if (ch2 < 0) |
| throw new EOFException(); |
| if (ch3 < 0) |
| throw new EOFException(); |
| if (ch4 < 0) |
| throw new EOFException(); |
| return ch1 + (ch2 << 8) | (ch3 << 16) | (ch4 << 24); |
| } |
| |
| // Read 64 bit signed integer from stream |
| public long readLong() throws IOException { |
| long ch1 = read(); |
| long ch2 = read(); |
| long ch3 = read(); |
| long ch4 = read(); |
| long ch5 = read(); |
| long ch6 = read(); |
| long ch7 = read(); |
| long ch8 = read(); |
| if (ch1 < 0) |
| throw new EOFException(); |
| if (ch2 < 0) |
| throw new EOFException(); |
| if (ch3 < 0) |
| throw new EOFException(); |
| if (ch4 < 0) |
| throw new EOFException(); |
| if (ch5 < 0) |
| throw new EOFException(); |
| if (ch6 < 0) |
| throw new EOFException(); |
| if (ch7 < 0) |
| throw new EOFException(); |
| if (ch8 < 0) |
| throw new EOFException(); |
| return ch1 | (ch2 << 8) | (ch3 << 16) | (ch4 << 24) |
| | (ch5 << 32) | (ch6 << 40) | (ch7 << 48) | (ch8 << 56); |
| } |
| |
| // Read 8 bit unsigned integer from stream |
| public int readUnsignedByte() throws IOException { |
| int ch = read(); |
| if (ch < 0) |
| throw new EOFException(); |
| return ch; |
| } |
| |
| // Read 16 bit unsigned integer from stream |
| public int readUnsignedShort() throws IOException { |
| int ch1 = read(); |
| int ch2 = read(); |
| if (ch1 < 0) |
| throw new EOFException(); |
| if (ch2 < 0) |
| throw new EOFException(); |
| return ch1 | (ch2 << 8); |
| } |
| |
| // Read 32 bit unsigned integer from stream |
| public long readUnsignedInt() throws IOException { |
| long ch1 = read(); |
| long ch2 = read(); |
| long ch3 = read(); |
| long ch4 = read(); |
| if (ch1 < 0) |
| throw new EOFException(); |
| if (ch2 < 0) |
| throw new EOFException(); |
| if (ch3 < 0) |
| throw new EOFException(); |
| if (ch4 < 0) |
| throw new EOFException(); |
| return ch1 + (ch2 << 8) | (ch3 << 16) | (ch4 << 24); |
| } |
| |
| public void close() throws IOException { |
| finish(); |
| if (this == root) |
| stream.close(); |
| stream = null; |
| } |
| } |