summaryrefslogtreecommitdiffstats
blob: b8c065dc485b1dc01e75cb590e66853ac5b32ca4 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#define LOG_TAG "PropertyMap"

#include <utils/PropertyMap.h>

// Enables debug output for the parser.
#define DEBUG_PARSER 0

// Enables debug output for parser performance.
#define DEBUG_PARSER_PERFORMANCE 0


namespace android {

static const char* WHITESPACE = " \t\r";
static const char* WHITESPACE_OR_PROPERTY_DELIMITER = " \t\r=";


// --- PropertyMap ---

PropertyMap::PropertyMap() {
}

PropertyMap::~PropertyMap() {
}

void PropertyMap::clear() {
    mProperties.clear();
}

void PropertyMap::addProperty(const String8& key, const String8& value) {
    mProperties.add(key, value);
}

bool PropertyMap::hasProperty(const String8& key) const {
    return mProperties.indexOfKey(key) >= 0;
}

bool PropertyMap::tryGetProperty(const String8& key, String8& outValue) const {
    ssize_t index = mProperties.indexOfKey(key);
    if (index < 0) {
        return false;
    }

    outValue = mProperties.valueAt(index);
    return true;
}

bool PropertyMap::tryGetProperty(const String8& key, bool& outValue) const {
    int32_t intValue;
    if (!tryGetProperty(key, intValue)) {
        return false;
    }

    outValue = intValue;
    return true;
}

bool PropertyMap::tryGetProperty(const String8& key, int32_t& outValue) const {
    String8 stringValue;
    if (! tryGetProperty(key, stringValue) || stringValue.length() == 0) {
        return false;
    }

    char* end;
    int value = strtol(stringValue.string(), & end, 10);
    if (*end != '\0') {
        ALOGW("Property key '%s' has invalid value '%s'.  Expected an integer.",
                key.string(), stringValue.string());
        return false;
    }
    outValue = value;
    return true;
}

bool PropertyMap::tryGetProperty(const String8& key, float& outValue) const {
    String8 stringValue;
    if (! tryGetProperty(key, stringValue) || stringValue.length() == 0) {
        return false;
    }

    char* end;
    float value = strtof(stringValue.string(), & end);
    if (*end != '\0') {
        ALOGW("Property key '%s' has invalid value '%s'.  Expected a float.",
                key.string(), stringValue.string());
        return false;
    }
    outValue = value;
    return true;
}

void PropertyMap::addAll(const PropertyMap* map) {
    for (size_t i = 0; i < map->mProperties.size(); i++) {
        mProperties.add(map->mProperties.keyAt(i), map->mProperties.valueAt(i));
    }
}

status_t PropertyMap::load(const String8& filename, PropertyMap** outMap) {
    *outMap = nullptr;

    Tokenizer* tokenizer;
    status_t status = Tokenizer::open(filename, &tokenizer);
    if (status) {
        ALOGE("Error %d opening property file %s.", status, filename.string());
    } else {
        PropertyMap* map = new PropertyMap();
        if (!map) {
            ALOGE("Error allocating property map.");
            status = NO_MEMORY;
        } else {
#if DEBUG_PARSER_PERFORMANCE
            nsecs_t startTime = systemTime(SYSTEM_TIME_MONOTONIC);
#endif
            Parser parser(map, tokenizer);
            status = parser.parse();
#if DEBUG_PARSER_PERFORMANCE
            nsecs_t elapsedTime = systemTime(SYSTEM_TIME_MONOTONIC) - startTime;
            ALOGD("Parsed property file '%s' %d lines in %0.3fms.",
                    tokenizer->getFilename().string(), tokenizer->getLineNumber(),
                    elapsedTime / 1000000.0);
#endif
            if (status) {
                delete map;
            } else {
                *outMap = map;
            }
        }
        delete tokenizer;
    }
    return status;
}


// --- PropertyMap::Parser ---

PropertyMap::Parser::Parser(PropertyMap* map, Tokenizer* tokenizer) :
        mMap(map), mTokenizer(tokenizer) {
}

PropertyMap::Parser::~Parser() {
}

status_t PropertyMap::Parser::parse() {
    while (!mTokenizer->isEof()) {
#if DEBUG_PARSER
        ALOGD("Parsing %s: '%s'.", mTokenizer->getLocation().string(),
                mTokenizer->peekRemainderOfLine().string());
#endif

        mTokenizer->skipDelimiters(WHITESPACE);

        if (!mTokenizer->isEol() && mTokenizer->peekChar() != '#') {
            String8 keyToken = mTokenizer->nextToken(WHITESPACE_OR_PROPERTY_DELIMITER);
            if (keyToken.isEmpty()) {
                ALOGE("%s: Expected non-empty property key.", mTokenizer->getLocation().string());
                return BAD_VALUE;
            }

            mTokenizer->skipDelimiters(WHITESPACE);

            if (mTokenizer->nextChar() != '=') {
                ALOGE("%s: Expected '=' between property key and value.",
                        mTokenizer->getLocation().string());
                return BAD_VALUE;
            }

            mTokenizer->skipDelimiters(WHITESPACE);

            String8 valueToken = mTokenizer->nextToken(WHITESPACE);
            if (valueToken.find("\\", 0) >= 0 || valueToken.find("\"", 0) >= 0) {
                ALOGE("%s: Found reserved character '\\' or '\"' in property value.",
                        mTokenizer->getLocation().string());
                return BAD_VALUE;
            }

            mTokenizer->skipDelimiters(WHITESPACE);
            if (!mTokenizer->isEol()) {
                ALOGE("%s: Expected end of line, got '%s'.",
                        mTokenizer->getLocation().string(),
                        mTokenizer->peekRemainderOfLine().string());
                return BAD_VALUE;
            }

            if (mMap->hasProperty(keyToken)) {
                ALOGE("%s: Duplicate property value for key '%s'.",
                        mTokenizer->getLocation().string(), keyToken.string());
                return BAD_VALUE;
            }

            mMap->addProperty(keyToken, valueToken);
        }

        mTokenizer->nextLine();
    }
    return NO_ERROR;
}

} // namespace android