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annotate dwt/internal/image/PngInputStream.d @ 6:b903c16b6f48

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Removed throws decls
author Frank Benoit <benoit@tionex.de>
date Wed, 27 Aug 2008 14:10:03 +0200
parents 1a8b3cb347e0
children 5123b17c98ef
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2006 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 *******************************************************************************/
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11 module dwt.internal.image;
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12
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13 import java.io.IOException;
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14 import java.io.InputStream;
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15
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16 public class PngInputStream : InputStream {
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17 PngChunkReader reader;
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18 PngChunk chunk;
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19 int offset, length;
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20
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21 final static int DATA_OFFSET = 8;
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1a8b3cb347e0 Fix Ctors to 'this'
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23 public this(PngIdatChunk chunk, PngChunkReader reader) {
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24 this.chunk = chunk;
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25 this.reader = reader;
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26 length = chunk.getLength();
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27 offset = 0;
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28 }
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30 private bool checkChunk() {
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31 while (offset is length) {
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32 chunk = reader.readNextChunk();
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33 if (chunk is null) throw new IOException();
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34 if (chunk.getChunkType() is PngChunk.CHUNK_IEND) return false;
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35 if (chunk.getChunkType() !is PngChunk.CHUNK_IDAT) throw new IOException();
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36 length = chunk.getLength();
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37 offset = 0;
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38 }
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39 return true;
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40 }
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42 public void close() {
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43 chunk = null;
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44 }
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46 public int read() {
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47 if (chunk is null) throw new IOException();
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48 if (offset is length && !checkChunk()) return -1;
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49 int b = chunk.reference[DATA_OFFSET + offset] & 0xFF;
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50 offset++;
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51 return b;
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52 }
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54 public int read(byte[] b, int off, int len) {
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55 if (chunk is null) throw new IOException();
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56 if (offset is length && !checkChunk()) return -1;
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57 len = Math.min(len, length - offset);
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58 System.arraycopy(chunk.reference, DATA_OFFSET + offset, b, off, len);
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59 offset += len;
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60 return len;
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61 }
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62 }