rsStream.cpp revision fb6b614bcea88a587a7ea4530be45ff0ffa0210e 
1
2/*
3 * Copyright (C) 2009 The Android Open Source Project
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 *      http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18#ifndef ANDROID_RS_BUILD_FOR_HOST
19#include "rsContext.h"
20#else
21#include "rsContextHostStub.h"
22#endif
23
24#include "rsStream.h"
25
26using namespace android;
27using namespace android::renderscript;
28
29IStream::IStream(const uint8_t *buf, bool use64)
30{
31    mData = buf;
32    mPos = 0;
33    mUse64 = use64;
34}
35
36void IStream::loadByteArray(void *dest, size_t numBytes)
37{
38    memcpy(dest, mData + mPos, numBytes);
39    mPos += numBytes;
40}
41
42uint64_t IStream::loadOffset()
43{
44    uint64_t tmp;
45    if (mUse64) {
46        mPos = (mPos + 7) & (~7);
47        tmp = reinterpret_cast<const uint64_t *>(&mData[mPos])[0];
48        mPos += sizeof(uint64_t);
49        return tmp;
50    }
51    return loadU32();
52}
53
54void IStream::loadString(String8 *s)
55{
56    LOGE("loadString");
57    uint32_t len = loadU32();
58    LOGE("loadString len %i", len);
59    s->setTo((const char *)&mData[mPos], len);
60    mPos += len;
61}
62
63
64// Output stream implementation
65
66OStream::OStream(uint64_t len, bool use64)
67{
68    mData = (uint8_t*)malloc(len);
69    mLength = len;
70    mPos = 0;
71    mUse64 = use64;
72}
73
74OStream::~OStream()
75{
76    free(mData);
77}
78
79void OStream::addByteArray(const void *src, size_t numBytes)
80{
81    // We need to potentially grow more than once if the number of byes we write is substantial
82    while(mPos + numBytes >= mLength) {
83        growSize();
84    }
85    memcpy(mData + mPos, src, numBytes);
86    mPos += numBytes;
87}
88
89void OStream::addOffset(uint64_t v)
90{
91    if (mUse64) {
92        mPos = (mPos + 7) & (~7);
93        if(mPos + sizeof(v) >= mLength) {
94            growSize();
95        }
96        mData[mPos++] = (uint8_t)(v & 0xff);
97        mData[mPos++] = (uint8_t)((v >> 8) & 0xff);
98        mData[mPos++] = (uint8_t)((v >> 16) & 0xff);
99        mData[mPos++] = (uint8_t)((v >> 24) & 0xff);
100        mData[mPos++] = (uint8_t)((v >> 32) & 0xff);
101        mData[mPos++] = (uint8_t)((v >> 40) & 0xff);
102        mData[mPos++] = (uint8_t)((v >> 48) & 0xff);
103        mData[mPos++] = (uint8_t)((v >> 56) & 0xff);
104    }
105    else {
106        addU32(v);
107    }
108}
109
110void OStream::addString(String8 *s)
111{
112    uint32_t len = s->size();
113    addU32(len);
114    if(mPos + len*sizeof(char) >= mLength) {
115        growSize();
116    }
117    char *stringData = reinterpret_cast<char *>(&mData[mPos]);
118    for(uint32_t i = 0; i < len; i ++) {
119        stringData[i] = s->string()[i];
120    }
121    mPos += len*sizeof(char);
122}
123
124void OStream::growSize()
125{
126    uint8_t *newData = (uint8_t*)malloc(mLength*2);
127    memcpy(newData, mData, mLength*sizeof(uint8_t));
128    mLength = mLength * 2;
129    free(mData);
130    mData = newData;
131}
132
133
134