1/*
2 * Copyright 2013 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
17#include <stdio.h>
18#include <stdlib.h>
19#include <cutils/log.h>
20#include <utils/String8.h>
21
22#include "EventLog.h"
23
24// ---------------------------------------------------------------------------
25namespace android {
26// ---------------------------------------------------------------------------
27
28ANDROID_SINGLETON_STATIC_INSTANCE(EventLog)
29
30
31EventLog::EventLog() {
32}
33
34void EventLog::doLogFrameDurations(const String8& window,
35        const int32_t* durations, size_t numDurations) {
36    EventLog::TagBuffer buffer(LOGTAG_SF_FRAME_DUR);
37    buffer.startList(1 + numDurations);
38    buffer.writeString8(window);
39    for (size_t i = 0; i < numDurations; i++) {
40        buffer.writeInt32(durations[i]);
41    }
42    buffer.endList();
43    buffer.log();
44}
45
46void EventLog::logFrameDurations(const String8& window,
47        const int32_t* durations, size_t numDurations) {
48    EventLog::getInstance().doLogFrameDurations(window, durations,
49            numDurations);
50}
51
52// ---------------------------------------------------------------------------
53
54EventLog::TagBuffer::TagBuffer(int32_t tag)
55    : mPos(0), mTag(tag), mOverflow(false) {
56}
57
58void EventLog::TagBuffer::log() {
59    if (mOverflow) {
60        ALOGW("couldn't log to binary event log: overflow.");
61    } else if (android_bWriteLog(mTag, mStorage, mPos) < 0) {
62        ALOGE("couldn't log to EventLog: %s", strerror(errno));
63    }
64    // purge the buffer
65    mPos = 0;
66    mOverflow = false;
67}
68
69void EventLog::TagBuffer::startList(int8_t count) {
70    if (mOverflow) return;
71    const size_t needed = 1 + sizeof(count);
72    if (mPos + needed > STORAGE_MAX_SIZE) {
73        mOverflow = true;
74        return;
75    }
76    mStorage[mPos + 0] = EVENT_TYPE_LIST;
77    mStorage[mPos + 1] = count;
78    mPos += needed;
79}
80
81void EventLog::TagBuffer::endList() {
82    if (mOverflow) return;
83    const size_t needed = 1;
84    if (mPos + needed > STORAGE_MAX_SIZE) {
85        mOverflow = true;
86        return;
87    }
88    mStorage[mPos + 0] = '\n';
89    mPos += needed;
90}
91
92void EventLog::TagBuffer::writeInt32(int32_t value) {
93    if (mOverflow) return;
94    const size_t needed = 1 + sizeof(value);
95    if (mPos + needed > STORAGE_MAX_SIZE) {
96        mOverflow = true;
97        return;
98    }
99    mStorage[mPos + 0] = EVENT_TYPE_INT;
100    memcpy(&mStorage[mPos + 1], &value, sizeof(value));
101    mPos += needed;
102}
103
104void EventLog::TagBuffer::writeInt64(int64_t value) {
105    if (mOverflow) return;
106    const size_t needed = 1 + sizeof(value);
107    if (mPos + needed > STORAGE_MAX_SIZE) {
108        mOverflow = true;
109        return;
110    }
111    mStorage[mPos + 0] = EVENT_TYPE_LONG;
112    memcpy(&mStorage[mPos + 1], &value, sizeof(value));
113    mPos += needed;
114}
115
116void EventLog::TagBuffer::writeString8(const String8& value) {
117    if (mOverflow) return;
118    const int32_t stringLen = value.length();
119    const size_t needed = 1 + sizeof(int32_t) + stringLen;
120    if (mPos + needed > STORAGE_MAX_SIZE) {
121        mOverflow = true;
122        return;
123    }
124    mStorage[mPos + 0] = EVENT_TYPE_STRING;
125    memcpy(&mStorage[mPos + 1], &stringLen, sizeof(int32_t));
126    memcpy(&mStorage[mPos + 5], value.string(), stringLen);
127    mPos += needed;
128}
129
130// ---------------------------------------------------------------------------
131}// namespace android
132
133// ---------------------------------------------------------------------------
134