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1
32 package com.imagero.uio.io;
33
34 import java.io.IOException  ;
35
36
41 public class RLE4InputStream extends RLEInputStream {
42
43 byte[] value = new byte[2];
44
45 BitInputStream bin;
46
47 byte[] buffer = new byte[128];
48 int bufferStart;
49 int bufferLength;
50
51 ByteArrayOutputStreamExt bout;
52 BitOutputStream bitOut;
53
54 public RLE4InputStream(BitInputStream in) {
55 super(in);
56 bin = in;
57 bin.setBitsToRead(4);
58 bout = new ByteArrayOutputStreamExt();
59 bitOut = new BitOutputStream(bout);
60 }
61
62 public int read() throws IOException {
63 if (bufferStart >= bufferLength) {
64 fillBuffer();
65 }
66 if (bufferStart >= bufferLength) {
67 return -1;
68 }
69 return buffer[bufferStart++];
70 }
71
72 private void fillBuffer() throws IOException {
73 if (bout.size() == 0) {
74 fillBufferImpl();
75 }
76 bufferStart = 0;
77 bufferLength = bout.drain(buffer);
78 }
79
80 private void fillBufferImpl() throws IOException {
81 int len = bin.read(8);
82 if (len == 0) {
83 int value = bin.read(8);
84 switch (value) {
85 case 0:
86 throw new EndOfLineException();
87 case 1:
88 finished = true;
89 throw new EndOfBitmapException();
90 case 2:
91 int x = bin.read(8);
92 int y = bin.read(8);
93 throw new DeltaRecordException(Integer.toHexString(x) + Integer.toHexString(y));
94 default:
95 int skipCount = 0;
96 if ((value & 3) != 0) {
97 skipCount = (value + 3) / 4 * 4 - value;
98 }
99 for (int i = 0; i < value; i++) {
100 bitOut.write(bin.read(4), 4);
101 }
102 for (int i = 0; i < skipCount; i++) {
103 bin.read(4);
104 }
105 }
106 }
107 else {
108 value[0] = (byte) bin.read(4);
109 value[1] = (byte) bin.read(4);
110
111 for (int i = 0; i < len; i++) {
112 bitOut.write(value[i & 1], 4);
113 }
114 }
115 }
116 }
117
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Java API By Example, From Geeks To Geeks.