61 lines
2.4 KiB
Erlang
61 lines
2.4 KiB
Erlang
%%%-------------------------------------------------------------------
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%% Copyright 2022 The Ip2Region Authors. All rights reserved.
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%% Use of this source code is governed by a Apache2.0-style
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%% license that can be found in the LICENSE file.
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%%
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%% @doc
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%% ip2region xdb binary format helpers.
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%% @end
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%%%-------------------------------------------------------------------
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-module(ip2region_xdb).
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-export([parse_header/1]).
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-export([header_version/1, header_index_policy/1, header_created_at/1,
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header_start_index_ptr/1, header_end_index_ptr/1,
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header_ip_version/1, header_runtime_ptr_bytes/1]).
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-export([segment_index_size/1]).
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-export([vector_index_table/1, segment_index_table/1, cache_table/1]).
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-include("ip2region.hrl").
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-spec parse_header(binary()) -> {ok, #xdb_header{}} | {error, invalid_header}.
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parse_header(Bin) when is_binary(Bin), byte_size(Bin) >= 20 ->
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<<Version:16/little, IndexPolicy:16/little, CreatedAt:32/little,
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StartIndexPtr:32/little, EndIndexPtr:32/little,
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IpVersion:16/little, RuntimePtrBytes:16/little, _/binary>> = Bin,
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{ok, #xdb_header{
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version = Version,
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index_policy = IndexPolicy,
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created_at = CreatedAt,
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start_index_ptr = StartIndexPtr,
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end_index_ptr = EndIndexPtr,
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ip_version = IpVersion,
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runtime_ptr_bytes = RuntimePtrBytes
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}};
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parse_header(_) ->
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{error, invalid_header}.
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header_version(#xdb_header{version = V}) -> V.
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header_index_policy(#xdb_header{index_policy = P}) -> P.
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header_created_at(#xdb_header{created_at = T}) -> T.
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header_start_index_ptr(#xdb_header{start_index_ptr = P}) -> P.
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header_end_index_ptr(#xdb_header{end_index_ptr = P}) -> P.
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header_ip_version(#xdb_header{ip_version = V}) -> V.
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header_runtime_ptr_bytes(#xdb_header{runtime_ptr_bytes = B}) -> B.
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-spec segment_index_size(ipv4 | ipv6) -> pos_integer().
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segment_index_size(ipv4) -> ?XDB_SEGMENT_INDEX_SIZE_V4;
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segment_index_size(ipv6) -> ?XDB_SEGMENT_INDEX_SIZE_V6.
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-spec vector_index_table(ipv4 | ipv6) -> atom().
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vector_index_table(ipv4) -> ?XDB_VECTOR_INDEX_V4;
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vector_index_table(ipv6) -> ?XDB_VECTOR_INDEX_V6.
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-spec segment_index_table(ipv4 | ipv6) -> atom().
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segment_index_table(ipv4) -> ?XDB_SEGMENT_INDEX_V4;
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segment_index_table(ipv6) -> ?XDB_SEGMENT_INDEX_V6.
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-spec cache_table(ipv4 | ipv6) -> atom().
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cache_table(ipv4) -> ?IP2REGION_CACHE_V4;
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cache_table(ipv6) -> ?IP2REGION_CACHE_V6.
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