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| 1 // Copyright (c) 2015, the Dartino project authors. Please see the AUTHORS file | |
| 2 // for details. All rights reserved. Use of this source code is governed by a | |
| 3 // BSD-style license that can be found in the LICENSE.md file. | |
| 4 | |
| 5 package dartino; | |
| 6 | |
| 7 import java.nio.ByteBuffer; | |
| 8 import java.nio.charset.Charset; | |
| 9 | |
| 10 class Reader { | |
| 11 public Reader() { } | |
| 12 | |
| 13 public Reader(byte[] memory, int offset) { | |
| 14 segment = new Segment(memory); | |
| 15 base = offset; | |
| 16 } | |
| 17 | |
| 18 public Reader(Segment segment, int offset) { | |
| 19 this.segment = segment; | |
| 20 base = offset; | |
| 21 } | |
| 22 | |
| 23 public Reader(byte[][] segments, int offset) { | |
| 24 MessageReader reader = new MessageReader(segments); | |
| 25 segment = reader.getSegment(0); | |
| 26 base = offset; | |
| 27 } | |
| 28 | |
| 29 public Reader readStruct(Reader reader, int offset) { | |
| 30 Segment s = segment; | |
| 31 offset += base; | |
| 32 while (true) { | |
| 33 ByteBuffer buffer = s.buffer(); | |
| 34 int lo = buffer.getInt(offset + 0); | |
| 35 int hi = buffer.getInt(offset + 4); | |
| 36 int tag = lo & 3; | |
| 37 if (tag == 0) { | |
| 38 // Cannot read uninitialized structs. | |
| 39 System.exit(1); | |
| 40 } else if (tag == 1) { | |
| 41 reader.segment = s; | |
| 42 reader.base = lo >> 2; | |
| 43 return reader; | |
| 44 } else { | |
| 45 s = s.reader().getSegment(hi); | |
| 46 offset = lo >> 2; | |
| 47 } | |
| 48 } | |
| 49 } | |
| 50 | |
| 51 public ListReader readList(ListReader reader, int offset) { | |
| 52 Segment s = segment; | |
| 53 offset += base; | |
| 54 while (true) { | |
| 55 ByteBuffer buffer = s.buffer(); | |
| 56 int lo = buffer.getInt(offset + 0); | |
| 57 int hi = buffer.getInt(offset + 4); | |
| 58 int tag = lo & 3; | |
| 59 if (tag == 0) { | |
| 60 // If the list hasn't been initialized we return an empty | |
| 61 // list. | |
| 62 reader.length = 0; | |
| 63 return reader; | |
| 64 } else if (tag == 1) { | |
| 65 reader.segment = s; | |
| 66 reader.base = lo >> 2; | |
| 67 reader.length = hi; | |
| 68 return reader; | |
| 69 } else { | |
| 70 s = s.reader().getSegment(hi); | |
| 71 offset = lo >> 2; | |
| 72 } | |
| 73 } | |
| 74 } | |
| 75 | |
| 76 public String readString(int offset) { | |
| 77 ListReader reader = new ListReader(); | |
| 78 readList(reader, offset); | |
| 79 byte[] data = reader.segment.buffer().array(); | |
| 80 int byteLength = reader.length * 2; | |
| 81 return new String( | |
| 82 data, reader.base, byteLength, Charset.forName("UTF_16LE")); | |
| 83 } | |
| 84 | |
| 85 public int computeUsed() { | |
| 86 MessageReader reader = segment.reader(); | |
| 87 int used = 0; | |
| 88 for (int i = 0; i < reader.segmentCount(); i++) { | |
| 89 used += reader.getSegment(i).buffer().capacity(); | |
| 90 } | |
| 91 return used; | |
| 92 } | |
| 93 | |
| 94 protected Segment segment; | |
| 95 protected int base; | |
| 96 } | |
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