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
17 #define LOG_TAG "PropertyMap"
18
19 #include <stdlib.h>
20 #include <string.h>
21
22 #include <utils/PropertyMap.h>
23 #include <utils/Log.h>
24
25 // Enables debug output for the parser.
26 #define DEBUG_PARSER 0
27
28 // Enables debug output for parser performance.
29 #define DEBUG_PARSER_PERFORMANCE 0
30
31
32 namespace android {
33
34 static const char* WHITESPACE = " \t\r";
35 static const char* WHITESPACE_OR_PROPERTY_DELIMITER = " \t\r=";
36
37
38 // --- PropertyMap ---
39
PropertyMap()40 PropertyMap::PropertyMap() {
41 }
42
~PropertyMap()43 PropertyMap::~PropertyMap() {
44 }
45
clear()46 void PropertyMap::clear() {
47 mProperties.clear();
48 }
49
addProperty(const String8 & key,const String8 & value)50 void PropertyMap::addProperty(const String8& key, const String8& value) {
51 mProperties.add(key, value);
52 }
53
hasProperty(const String8 & key) const54 bool PropertyMap::hasProperty(const String8& key) const {
55 return mProperties.indexOfKey(key) >= 0;
56 }
57
tryGetProperty(const String8 & key,String8 & outValue) const58 bool PropertyMap::tryGetProperty(const String8& key, String8& outValue) const {
59 ssize_t index = mProperties.indexOfKey(key);
60 if (index < 0) {
61 return false;
62 }
63
64 outValue = mProperties.valueAt(index);
65 return true;
66 }
67
tryGetProperty(const String8 & key,bool & outValue) const68 bool PropertyMap::tryGetProperty(const String8& key, bool& outValue) const {
69 int32_t intValue;
70 if (!tryGetProperty(key, intValue)) {
71 return false;
72 }
73
74 outValue = intValue;
75 return true;
76 }
77
tryGetProperty(const String8 & key,int32_t & outValue) const78 bool PropertyMap::tryGetProperty(const String8& key, int32_t& outValue) const {
79 String8 stringValue;
80 if (! tryGetProperty(key, stringValue) || stringValue.length() == 0) {
81 return false;
82 }
83
84 char* end;
85 int value = strtol(stringValue.string(), & end, 10);
86 if (*end != '\0') {
87 ALOGW("Property key '%s' has invalid value '%s'. Expected an integer.",
88 key.string(), stringValue.string());
89 return false;
90 }
91 outValue = value;
92 return true;
93 }
94
tryGetProperty(const String8 & key,float & outValue) const95 bool PropertyMap::tryGetProperty(const String8& key, float& outValue) const {
96 String8 stringValue;
97 if (! tryGetProperty(key, stringValue) || stringValue.length() == 0) {
98 return false;
99 }
100
101 char* end;
102 float value = strtof(stringValue.string(), & end);
103 if (*end != '\0') {
104 ALOGW("Property key '%s' has invalid value '%s'. Expected a float.",
105 key.string(), stringValue.string());
106 return false;
107 }
108 outValue = value;
109 return true;
110 }
111
addAll(const PropertyMap * map)112 void PropertyMap::addAll(const PropertyMap* map) {
113 for (size_t i = 0; i < map->mProperties.size(); i++) {
114 mProperties.add(map->mProperties.keyAt(i), map->mProperties.valueAt(i));
115 }
116 }
117
load(const String8 & filename,PropertyMap ** outMap)118 status_t PropertyMap::load(const String8& filename, PropertyMap** outMap) {
119 *outMap = NULL;
120
121 Tokenizer* tokenizer;
122 status_t status = Tokenizer::open(filename, &tokenizer);
123 if (status) {
124 ALOGE("Error %d opening property file %s.", status, filename.string());
125 } else {
126 PropertyMap* map = new PropertyMap();
127 if (!map) {
128 ALOGE("Error allocating property map.");
129 status = NO_MEMORY;
130 } else {
131 #if DEBUG_PARSER_PERFORMANCE
132 nsecs_t startTime = systemTime(SYSTEM_TIME_MONOTONIC);
133 #endif
134 Parser parser(map, tokenizer);
135 status = parser.parse();
136 #if DEBUG_PARSER_PERFORMANCE
137 nsecs_t elapsedTime = systemTime(SYSTEM_TIME_MONOTONIC) - startTime;
138 ALOGD("Parsed property file '%s' %d lines in %0.3fms.",
139 tokenizer->getFilename().string(), tokenizer->getLineNumber(),
140 elapsedTime / 1000000.0);
141 #endif
142 if (status) {
143 delete map;
144 } else {
145 *outMap = map;
146 }
147 }
148 delete tokenizer;
149 }
150 return status;
151 }
152
153
154 // --- PropertyMap::Parser ---
155
Parser(PropertyMap * map,Tokenizer * tokenizer)156 PropertyMap::Parser::Parser(PropertyMap* map, Tokenizer* tokenizer) :
157 mMap(map), mTokenizer(tokenizer) {
158 }
159
~Parser()160 PropertyMap::Parser::~Parser() {
161 }
162
parse()163 status_t PropertyMap::Parser::parse() {
164 while (!mTokenizer->isEof()) {
165 #if DEBUG_PARSER
166 ALOGD("Parsing %s: '%s'.", mTokenizer->getLocation().string(),
167 mTokenizer->peekRemainderOfLine().string());
168 #endif
169
170 mTokenizer->skipDelimiters(WHITESPACE);
171
172 if (!mTokenizer->isEol() && mTokenizer->peekChar() != '#') {
173 String8 keyToken = mTokenizer->nextToken(WHITESPACE_OR_PROPERTY_DELIMITER);
174 if (keyToken.isEmpty()) {
175 ALOGE("%s: Expected non-empty property key.", mTokenizer->getLocation().string());
176 return BAD_VALUE;
177 }
178
179 mTokenizer->skipDelimiters(WHITESPACE);
180
181 if (mTokenizer->nextChar() != '=') {
182 ALOGE("%s: Expected '=' between property key and value.",
183 mTokenizer->getLocation().string());
184 return BAD_VALUE;
185 }
186
187 mTokenizer->skipDelimiters(WHITESPACE);
188
189 String8 valueToken = mTokenizer->nextToken(WHITESPACE);
190 if (valueToken.find("\\", 0) >= 0 || valueToken.find("\"", 0) >= 0) {
191 ALOGE("%s: Found reserved character '\\' or '\"' in property value.",
192 mTokenizer->getLocation().string());
193 return BAD_VALUE;
194 }
195
196 mTokenizer->skipDelimiters(WHITESPACE);
197 if (!mTokenizer->isEol()) {
198 ALOGE("%s: Expected end of line, got '%s'.",
199 mTokenizer->getLocation().string(),
200 mTokenizer->peekRemainderOfLine().string());
201 return BAD_VALUE;
202 }
203
204 if (mMap->hasProperty(keyToken)) {
205 ALOGE("%s: Duplicate property value for key '%s'.",
206 mTokenizer->getLocation().string(), keyToken.string());
207 return BAD_VALUE;
208 }
209
210 mMap->addProperty(keyToken, valueToken);
211 }
212
213 mTokenizer->nextLine();
214 }
215 return NO_ERROR;
216 }
217
218 } // namespace android
219