mirror of
https://github.com/wanghongenpin/proxypin.git
synced 2026-05-30 17:05:49 +08:00
89 lines
2.5 KiB
Dart
89 lines
2.5 KiB
Dart
/*
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* Copyright 2023 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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enum FrameType { data, headers, priority, rstStream, settings, pushPromise, ping, goaway, windowUpdate, continuation }
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class FrameHeader {
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static const flagsEndStream = 0x01;
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static const flagsEndHeaders = 0x04;
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final int length;
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final FrameType type;
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int flags; // 8 bits
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final int streamIdentifier;
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FrameHeader(this.length, this.type, this.flags, this.streamIdentifier);
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bool get hasPaddedFlag => (flags & 0x08) == 0x08;
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bool get hasPriorityFlag => (flags & 0x20) == 0x20;
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bool get hasEndHeadersFlag => (flags & flagsEndHeaders) == flagsEndHeaders;
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bool get hasEndStreamFlag => (flags & flagsEndStream) == flagsEndStream;
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bool get hasAckFlag => (flags & 0x01) == 0x01;
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List<int> encode() {
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var result = <int>[];
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result.addAll(_intToBytes(length, 3)); // length is 24 bits
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result.add(type.index); // type is 8 bits
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result.add(flags); // flags is 8 bits
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result.addAll(_intToBytes(streamIdentifier, 4)); // streamIdentifier is 32 bits
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return result;
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}
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List<int> _intToBytes(int value, int byteCount) {
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var bytes = <int>[];
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for (var i = 0; i < byteCount; i++) {
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bytes.insert(0, value & 0xff);
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value >>= 8;
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}
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return bytes;
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}
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}
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class Frame {
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final FrameHeader header;
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Frame(this.header);
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Map toJson() => {
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'length': header.length,
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'type': header.type.toString().split('.')[1],
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'flags': header.flags,
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'streamIdentifier': header.streamIdentifier
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};
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}
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class HeadersFrame extends Frame {
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final int padLength;
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final bool exclusiveDependency;
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final int? streamDependency;
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final int? weight;
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final List<int> headerBlockFragment;
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HeadersFrame(super.header, this.padLength, this.exclusiveDependency, this.streamDependency, this.weight,
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this.headerBlockFragment);
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}
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class DataFrame extends Frame {
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final int padLength;
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final List<int> data;
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DataFrame(super.header, this.padLength, this.data);
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}
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