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      1 /*
      2  * Copyright (C) 2016 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 "proto_format.h"
     18 
     19 #include <string.h>
     20 
     21 extern int const PROTO_FORMAT_STRING_POOL_SIZE;
     22 extern int const PROTO_FORMAT_ENUM_LABELS_LENGTH;
     23 extern int const PROTO_FORMAT_MESSAGES_LENGTH;
     24 extern int const PROTO_FORMAT_FIELDS_LENGTH;
     25 
     26 extern char const PROTO_FORMAT_STRING_POOL[];
     27 extern ProtoFieldFormat const PROTO_FORMAT_FIELDS[];
     28 extern ProtoEnumLabel const PROTO_FORMAT_ENUM_LABELS[];
     29 extern ProtoMessageFormat const PROTO_FORMAT_MESSAGES[];
     30 
     31 static const char*
     32 get_string(int index)
     33 {
     34     if (index >= 0 && index < PROTO_FORMAT_STRING_POOL_SIZE) {
     35         return PROTO_FORMAT_STRING_POOL + index;
     36     } else {
     37         // These indices all come from within the generated table, so just crash now.
     38         *(int*)NULL = 42;
     39         return NULL;
     40     }
     41 }
     42 
     43 static ProtoMessageFormat const*
     44 get_message(int index)
     45 {
     46     if (index >= 0 && index < PROTO_FORMAT_MESSAGES_LENGTH) {
     47         return PROTO_FORMAT_MESSAGES + index;
     48     } else {
     49         // These indices all come from within the generated table, so just crash now.
     50         *(int*)NULL = 42;
     51         return NULL;
     52     }
     53 }
     54 
     55 static int
     56 compare_name(const char* full, const char* package, const char* clazz)
     57 {
     58     int const packageLen = strlen(package);
     59     int cmp = strncmp(full, package, packageLen);
     60     if (cmp == 0) {
     61         cmp = full[packageLen] - '.';
     62         if (cmp == 0) {
     63             return strcmp(full + packageLen, clazz);
     64         }
     65     }
     66     return cmp;
     67 }
     68 
     69 int
     70 find_message_index(const char* name)
     71 {
     72     size_t low = 0;
     73     size_t high = PROTO_FORMAT_FIELDS_LENGTH - 1;
     74 
     75     while (low <= high) {
     76         size_t mid = (low + high) >> 1;
     77         ProtoMessageFormat const* msg = get_message(mid);
     78 
     79         int cmp = compare_name(name, get_string(msg->package_name), get_string(msg->package_name));
     80         if (cmp < 0) {
     81             low = mid + 1;
     82         } else if (cmp > 0) {
     83             high = mid - 1;
     84         } else {
     85             return mid;
     86         }
     87     }
     88     return -1;
     89 }
     90