Joe Onorato | 1754d74 | 2016-11-21 17:51:35 -0800 | [diff] [blame] | 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 | } |