| /* |
| * Copyright (C) 2015 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. |
| */ |
| |
| #ifndef ANDROID_RADIO_METADATA_HIDDEN_H |
| #define ANDROID_RADIO_METADATA_HIDDEN_H |
| |
| #include <stdbool.h> |
| #include <system/radio.h> |
| #include <system/radio_metadata.h> |
| |
| /* default size allocated for a metadata buffer in 32 bits units */ |
| #define RADIO_METADATA_DEFAULT_SIZE 64 |
| /* maximum size allocated for a metadata buffer in 32 bits units */ |
| #define RADIO_METADATA_MAX_SIZE (RADIO_METADATA_DEFAULT_SIZE << 12) |
| |
| /* meta data entry in a meta data buffer */ |
| typedef struct radio_metadata_entry { |
| radio_metadata_key_t key; |
| radio_metadata_type_t type; |
| unsigned int size; |
| unsigned char data[]; |
| } radio_metadata_entry_t; |
| |
| |
| /** |
| * meta data buffer layout: |
| * |
| * | <--- 32 bit ---> | |
| * |---------------------------| |
| * | channel | |
| * |---------------------------| |
| * | sub_channel | |
| * |---------------------------| |
| * | size_int | total size in 32 bit units including header and index |
| * |---------------------------| |
| * | count | number of entries |
| * |---------------------------|<--+ |
| * | first entry | | |
| * | | | |
| * |---------------------------|<+ | |
| * | second entry | | | |
| * | | | | |
| * | | | | |
| * |---------------------------| | | |
| * | : | | | |
| * |---------------------------| | | \ |
| * | offset of next free space | | | | |
| * |---------------------------| | | | |
| * | : | | | | |
| * |---------------------------| | | > index |
| * | offset of second entry |-+ | | |
| * |---------------------------| | | |
| * | offset of first entry |---+ | |
| * |---------------------------| / |
| * |
| * A radio meta data buffer is allocated with radio_metadata_allocate() and released with |
| * radio_metadata_deallocate(). |
| * Meta data entries are added with radio_metadata_add_xxx() where xxx is int, text or raw. |
| * The buffer is allocated with a default size (RADIO_METADATA_DEFAULT_SIZE entries) |
| * by radio_metadata_allocate() and reallocated if needed by radio_metadata_add_xxx() |
| */ |
| |
| /* Radio meta data buffer header */ |
| typedef struct radio_metadata_buffer { |
| unsigned int channel; /* channel (frequency) this meta data is associated with */ |
| unsigned int sub_channel; /* sub channel this meta data is associated with */ |
| unsigned int size_int; /* Total size in 32 bit word units */ |
| unsigned int count; /* number of meta data entries */ |
| } radio_metadata_buffer_t; |
| |
| |
| |
| #endif // ANDROID_RADIO_METADATA_HIDDEN_H |
