FieldPacker.java revision 42d6c9e1e794713022d1370ba844ce05c7b2793f 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package android.renderscript;
18
19
20/**
21 * @hide
22 *
23 **/
24public class FieldPacker {
25    public FieldPacker(int len) {
26        mPos = 0;
27        mData = new byte[len];
28    }
29
30    public void align(int v) {
31        while ((mPos & (v - 1)) != 0) {
32            mData[mPos++] = 0;
33        }
34    }
35
36    void reset() {
37        mPos = 0;
38    }
39
40    void addI8(byte v) {
41        mData[mPos++] = v;
42    }
43
44    void addI16(short v) {
45        align(2);
46        mData[mPos++] = (byte)(v & 0xff);
47        mData[mPos++] = (byte)(v >> 8);
48    }
49
50    void addI32(int v) {
51        align(4);
52        mData[mPos++] = (byte)(v & 0xff);
53        mData[mPos++] = (byte)((v >> 8) & 0xff);
54        mData[mPos++] = (byte)((v >> 16) & 0xff);
55        mData[mPos++] = (byte)((v >> 24) & 0xff);
56    }
57
58    void addI64(long v) {
59        align(8);
60        mData[mPos++] = (byte)(v & 0xff);
61        mData[mPos++] = (byte)((v >> 8) & 0xff);
62        mData[mPos++] = (byte)((v >> 16) & 0xff);
63        mData[mPos++] = (byte)((v >> 24) & 0xff);
64        mData[mPos++] = (byte)((v >> 32) & 0xff);
65        mData[mPos++] = (byte)((v >> 40) & 0xff);
66        mData[mPos++] = (byte)((v >> 48) & 0xff);
67        mData[mPos++] = (byte)((v >> 56) & 0xff);
68    }
69
70    void addU8(short v) {
71        if ((v < 0) || (v > 0xff)) {
72            throw new IllegalArgumentException("Saving value out of range for type");
73        }
74        mData[mPos++] = (byte)v;
75    }
76
77    void addU16(int v) {
78        if ((v < 0) || (v > 0xffff)) {
79            throw new IllegalArgumentException("Saving value out of range for type");
80        }
81        align(2);
82        mData[mPos++] = (byte)(v & 0xff);
83        mData[mPos++] = (byte)(v >> 8);
84    }
85
86    void addU32(long v) {
87        if ((v < 0) || (v > 0xffffffff)) {
88            throw new IllegalArgumentException("Saving value out of range for type");
89        }
90        align(4);
91        mData[mPos++] = (byte)(v & 0xff);
92        mData[mPos++] = (byte)((v >> 8) & 0xff);
93        mData[mPos++] = (byte)((v >> 16) & 0xff);
94        mData[mPos++] = (byte)((v >> 24) & 0xff);
95    }
96
97    void addU64(long v) {
98        if (v < 0) {
99            throw new IllegalArgumentException("Saving value out of range for type");
100        }
101        align(8);
102        mData[mPos++] = (byte)(v & 0xff);
103        mData[mPos++] = (byte)((v >> 8) & 0xff);
104        mData[mPos++] = (byte)((v >> 16) & 0xff);
105        mData[mPos++] = (byte)((v >> 24) & 0xff);
106        mData[mPos++] = (byte)((v >> 32) & 0xff);
107        mData[mPos++] = (byte)((v >> 40) & 0xff);
108        mData[mPos++] = (byte)((v >> 48) & 0xff);
109        mData[mPos++] = (byte)((v >> 56) & 0xff);
110    }
111
112    void addF32(float v) {
113        addI32(Float.floatToRawIntBits(v));
114    }
115
116    void addF64(float v) {
117        addI64(Double.doubleToRawLongBits(v));
118    }
119
120    final byte[] getData() {
121        return mData;
122    }
123
124    private final byte mData[];
125    private int mPos;
126
127}
128
129
130