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      1 /*
      2  * Copyright 2012, 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 "Parameters.h"
     18 
     19 #include <media/stagefright/MediaErrors.h>
     20 
     21 namespace android {
     22 
     23 // static
     24 sp<Parameters> Parameters::Parse(const char *data, size_t size) {
     25     sp<Parameters> params = new Parameters;
     26     status_t err = params->parse(data, size);
     27 
     28     if (err != OK) {
     29         return NULL;
     30     }
     31 
     32     return params;
     33 }
     34 
     35 Parameters::Parameters() {}
     36 
     37 Parameters::~Parameters() {}
     38 
     39 status_t Parameters::parse(const char *data, size_t size) {
     40     size_t i = 0;
     41     while (i < size) {
     42         size_t nameStart = i;
     43         while (i < size && data[i] != ':') {
     44             ++i;
     45         }
     46 
     47         if (i == size || i == nameStart) {
     48             return ERROR_MALFORMED;
     49         }
     50 
     51         AString name(&data[nameStart], i - nameStart);
     52         name.trim();
     53         name.tolower();
     54 
     55         ++i;
     56 
     57         size_t valueStart = i;
     58 
     59         while (i + 1 < size && (data[i] != '\r' || data[i + 1] != '\n')) {
     60             ++i;
     61         }
     62 
     63         AString value(&data[valueStart], i - valueStart);
     64         value.trim();
     65 
     66         mDict.add(name, value);
     67 
     68         while (i + 1 < size && data[i] == '\r' && data[i + 1] == '\n') {
     69             i += 2;
     70         }
     71     }
     72 
     73     return OK;
     74 }
     75 
     76 bool Parameters::findParameter(const char *name, AString *value) const {
     77     AString key = name;
     78     key.tolower();
     79 
     80     ssize_t index = mDict.indexOfKey(key);
     81 
     82     if (index < 0) {
     83         value->clear();
     84 
     85         return false;
     86     }
     87 
     88     *value = mDict.valueAt(index);
     89     return true;
     90 }
     91 
     92 }  // namespace android
     93