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https://github.com/DrKLO/Telegram.git
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406 lines
12 KiB
C++
406 lines
12 KiB
C++
#include "Message.h"
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#include "rtc_base/byte_buffer.h"
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#include "api/jsep_ice_candidate.h"
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namespace tgcalls {
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namespace {
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constexpr auto kMaxStringLength = 65536;
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void Serialize(rtc::ByteBufferWriter &to, const std::string &from) {
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assert(from.size() < kMaxStringLength);
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to.WriteUInt32(uint32_t(from.size()));
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to.WriteString(from);
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}
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bool Deserialize(std::string &to, rtc::ByteBufferReader &from) {
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uint32_t length = 0;
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if (!from.ReadUInt32(&length)) {
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RTC_LOG(LS_ERROR) << "Could not read string length.";
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return false;
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} else if (length >= kMaxStringLength) {
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RTC_LOG(LS_ERROR) << "Invalid string length: " << length;
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return false;
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} else if (!from.ReadString(&to, length)) {
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RTC_LOG(LS_ERROR) << "Could not read string data.";
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return false;
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}
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return true;
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}
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void Serialize(rtc::ByteBufferWriter &to, const webrtc::SdpVideoFormat &from) {
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assert(from.parameters.size() < std::numeric_limits<uint8_t>::max());
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Serialize(to, from.name);
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to.WriteUInt8(uint8_t(from.parameters.size()));
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for (const auto &pair : from.parameters) {
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Serialize(to, pair.first);
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Serialize(to, pair.second);
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}
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}
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bool Deserialize(webrtc::SdpVideoFormat &to, rtc::ByteBufferReader &from) {
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if (!Deserialize(to.name, from)) {
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RTC_LOG(LS_ERROR) << "Could not read video format name.";
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return false;
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}
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auto count = uint8_t();
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if (!from.ReadUInt8(&count)) {
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RTC_LOG(LS_ERROR) << "Could not read video format parameters count.";
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return false;
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}
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for (uint32_t i = 0; i != count; ++i) {
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auto key = std::string();
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auto value = std::string();
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if (!Deserialize(key, from)) {
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RTC_LOG(LS_ERROR) << "Could not read video format parameter key.";
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return false;
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} else if (!Deserialize(value, from)) {
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RTC_LOG(LS_ERROR) << "Could not read video format parameter value.";
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return false;
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}
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to.parameters.emplace(key, value);
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}
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return true;
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}
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void Serialize(rtc::ByteBufferWriter &to, const cricket::Candidate &from) {
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webrtc::JsepIceCandidate iceCandidate{ std::string(), 0 };
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iceCandidate.SetCandidate(from);
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std::string serialized;
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const auto success = iceCandidate.ToString(&serialized);
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assert(success);
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(void)success;
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Serialize(to, serialized);
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}
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bool Deserialize(cricket::Candidate &to, rtc::ByteBufferReader &from) {
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std::string candidate;
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if (!Deserialize(candidate, from)) {
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RTC_LOG(LS_ERROR) << "Could not read candidate string.";
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return false;
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}
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webrtc::JsepIceCandidate parseCandidate{ std::string(), 0 };
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if (!parseCandidate.Initialize(candidate, nullptr)) {
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RTC_LOG(LS_ERROR) << "Could not parse candidate: " << candidate;
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return false;
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}
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to = parseCandidate.candidate();
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return true;
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}
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void Serialize(rtc::ByteBufferWriter &to, const RequestVideoMessage &from, bool singleMessagePacket) {
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}
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bool Deserialize(RequestVideoMessage &to, rtc::ByteBufferReader &reader, bool singleMessagePacket) {
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return true;
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}
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void Serialize(rtc::ByteBufferWriter &to, const RemoteMediaStateMessage &from, bool singleMessagePacket) {
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uint8_t state = (uint8_t(from.video) << 1) | uint8_t(from.audio);
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to.WriteUInt8(state);
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}
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bool Deserialize(RemoteMediaStateMessage &to, rtc::ByteBufferReader &reader, bool singleMessagePacket) {
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uint8_t state = 0;
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if (!reader.ReadUInt8(&state)) {
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RTC_LOG(LS_ERROR) << "Could not read remote media state.";
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return false;
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}
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to.audio = AudioState(state & 0x01);
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to.video = VideoState((state >> 1) & 0x03);
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if (to.video == VideoState(0x03)) {
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RTC_LOG(LS_ERROR) << "Invalid value for remote video state.";
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return false;
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}
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return true;
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}
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void Serialize(rtc::ByteBufferWriter &to, const CandidatesListMessage &from, bool singleMessagePacket) {
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assert(from.candidates.size() < std::numeric_limits<uint8_t>::max());
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to.WriteUInt8(uint8_t(from.candidates.size()));
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for (const auto &candidate : from.candidates) {
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Serialize(to, candidate);
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}
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Serialize(to, from.iceParameters.ufrag);
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Serialize(to, from.iceParameters.pwd);
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}
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bool Deserialize(CandidatesListMessage &to, rtc::ByteBufferReader &reader, bool singleMessagePacket) {
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auto count = uint8_t();
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if (!reader.ReadUInt8(&count)) {
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RTC_LOG(LS_ERROR) << "Could not read candidates count.";
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return false;
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}
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for (uint32_t i = 0; i != count; ++i) {
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auto candidate = cricket::Candidate();
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if (!Deserialize(candidate, reader)) {
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RTC_LOG(LS_ERROR) << "Could not read candidate.";
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return false;
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}
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to.candidates.push_back(std::move(candidate));
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}
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if (!Deserialize(to.iceParameters.ufrag, reader)) {
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return false;
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}
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if (!Deserialize(to.iceParameters.pwd, reader)) {
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return false;
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}
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return true;
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}
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void Serialize(rtc::ByteBufferWriter &to, const VideoFormatsMessage &from, bool singleMessagePacket) {
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assert(from.formats.size() < std::numeric_limits<uint8_t>::max());
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assert(from.encodersCount <= from.formats.size());
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to.WriteUInt8(uint8_t(from.formats.size()));
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for (const auto &format : from.formats) {
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Serialize(to, format);
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}
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to.WriteUInt8(uint8_t(from.encodersCount));
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}
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bool Deserialize(VideoFormatsMessage &to, rtc::ByteBufferReader &from, bool singleMessagePacket) {
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auto count = uint8_t();
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if (!from.ReadUInt8(&count)) {
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RTC_LOG(LS_ERROR) << "Could not read video formats count.";
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return false;
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}
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for (uint32_t i = 0; i != count; ++i) {
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auto format = webrtc::SdpVideoFormat(std::string());
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if (!Deserialize(format, from)) {
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RTC_LOG(LS_ERROR) << "Could not read video format.";
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return false;
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}
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to.formats.push_back(std::move(format));
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}
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auto encoders = uint8_t();
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if (!from.ReadUInt8(&encoders)) {
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RTC_LOG(LS_ERROR) << "Could not read encoders count.";
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return false;
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} else if (encoders > to.formats.size()) {
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RTC_LOG(LS_ERROR) << "Invalid encoders count: " << encoders << ", full formats count: " << to.formats.size();
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return false;
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}
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to.encodersCount = encoders;
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return true;
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}
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void Serialize(rtc::ByteBufferWriter &to, const rtc::CopyOnWriteBuffer &from, bool singleMessagePacket) {
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if (!singleMessagePacket) {
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assert(from.size() <= UINT16_MAX);
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to.WriteUInt16(from.size());
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}
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to.WriteBytes(reinterpret_cast<const char*>(from.cdata()), from.size());
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}
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bool Deserialize(rtc::CopyOnWriteBuffer &to, rtc::ByteBufferReader &from, bool singleMessagePacket) {
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auto length = uint16_t(from.Length());
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if (!singleMessagePacket) {
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if (!from.ReadUInt16(&length)) {
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RTC_LOG(LS_ERROR) << "Could not read buffer length.";
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return false;
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} else if (from.Length() < length) {
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RTC_LOG(LS_ERROR) << "Invalid buffer length: " << length << ", available: " << from.Length();
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return false;
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}
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}
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to.AppendData(from.Data(), length);
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from.Consume(length);
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return true;
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}
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void Serialize(rtc::ByteBufferWriter &to, const AudioDataMessage &from, bool singleMessagePacket) {
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Serialize(to, from.data, singleMessagePacket);
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}
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bool Deserialize(AudioDataMessage &to, rtc::ByteBufferReader &from, bool singleMessagePacket) {
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return Deserialize(to.data, from, singleMessagePacket);
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}
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void Serialize(rtc::ByteBufferWriter &to, const VideoDataMessage &from, bool singleMessagePacket) {
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Serialize(to, from.data, singleMessagePacket);
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}
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bool Deserialize(VideoDataMessage &to, rtc::ByteBufferReader &from, bool singleMessagePacket) {
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return Deserialize(to.data, from, singleMessagePacket);
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}
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void Serialize(rtc::ByteBufferWriter &to, const UnstructuredDataMessage &from, bool singleMessagePacket) {
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Serialize(to, from.data, singleMessagePacket);
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}
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bool Deserialize(UnstructuredDataMessage &to, rtc::ByteBufferReader &from, bool singleMessagePacket) {
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return Deserialize(to.data, from, singleMessagePacket);
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}
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void Serialize(rtc::ByteBufferWriter &to, const VideoParametersMessage &from, bool singleMessagePacket) {
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to.WriteUInt32(from.aspectRatio);
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}
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bool Deserialize(VideoParametersMessage &to, rtc::ByteBufferReader &from, bool singleMessagePacket) {
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uint32_t aspectRatio = 0;
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if (!from.ReadUInt32(&aspectRatio)) {
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return false;
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}
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to.aspectRatio = aspectRatio;
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return true;
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}
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void Serialize(rtc::ByteBufferWriter &to, const RemoteBatteryLevelIsLowMessage &from, bool singleMessagePacket) {
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to.WriteUInt8(from.batteryLow ? 1 : 0);
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}
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bool Deserialize(RemoteBatteryLevelIsLowMessage &to, rtc::ByteBufferReader &reader, bool singleMessagePacket) {
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uint8_t value = 0;
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if (!reader.ReadUInt8(&value)) {
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RTC_LOG(LS_ERROR) << "Could not read batteryLevelIsLow.";
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return false;
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}
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to.batteryLow = (value != 0);
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return true;
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}
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void Serialize(rtc::ByteBufferWriter &to, const RemoteNetworkStatusMessage &from, bool singleMessagePacket) {
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to.WriteUInt8(from.isLowCost ? 1 : 0);
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to.WriteUInt8(from.isLowDataRequested ? 1 : 0);
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}
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bool Deserialize(RemoteNetworkStatusMessage &to, rtc::ByteBufferReader &reader, bool singleMessagePacket) {
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uint8_t value = 0;
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if (!reader.ReadUInt8(&value)) {
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RTC_LOG(LS_ERROR) << "Could not read isLowCost.";
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return false;
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}
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to.isLowCost = (value != 0);
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if (reader.ReadUInt8(&value)) {
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to.isLowDataRequested = (value != 0);
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}
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return true;
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}
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enum class TryResult : uint8_t {
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Success,
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TryNext,
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Abort,
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};
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template <typename T>
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TryResult TryDeserialize(
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absl::optional<Message> &to,
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rtc::ByteBufferReader &reader,
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bool singleMessagePacket) {
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assert(reader.Length() != 0);
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constexpr auto id = T::kId;
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if (uint8_t(*reader.Data()) != id) {
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return TryResult::TryNext;
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}
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reader.Consume(1);
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auto parsed = T();
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if (!Deserialize(parsed, reader, singleMessagePacket)) {
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RTC_LOG(LS_ERROR) << "Could not read message with kId: " << id;
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return TryResult::Abort;
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}
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to = Message{ parsed };
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return TryResult::Success;
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}
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template <typename ...Types>
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struct TryDeserializeNext;
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template <>
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struct TryDeserializeNext<> {
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static bool Call(
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absl::optional<Message> &to,
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rtc::ByteBufferReader &reader,
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bool singleMessagePacket) {
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return false;
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}
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};
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template <typename T, typename ...Other>
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struct TryDeserializeNext<T, Other...> {
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static bool Call(
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absl::optional<Message> &to,
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rtc::ByteBufferReader &reader,
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bool singleMessagePacket) {
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const auto result = TryDeserialize<T>(to, reader, singleMessagePacket);
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return (result == TryResult::TryNext)
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? TryDeserializeNext<Other...>::Call(to, reader, singleMessagePacket)
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: (result == TryResult::Success);
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}
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};
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template <typename ...Types>
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bool TryDeserializeRecursive(
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absl::optional<Message> &to,
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rtc::ByteBufferReader &reader,
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bool singleMessagePacket,
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absl::variant<Types...> *) {
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return TryDeserializeNext<Types...>::Call(to, reader, singleMessagePacket);
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}
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} // namespace
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rtc::CopyOnWriteBuffer SerializeMessageWithSeq(
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const Message &message,
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uint32_t seq,
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bool singleMessagePacket) {
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rtc::ByteBufferWriter writer;
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writer.WriteUInt32(seq);
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absl::visit([&](const auto &data) {
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writer.WriteUInt8(std::decay_t<decltype(data)>::kId);
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Serialize(writer, data, singleMessagePacket);
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}, message.data);
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auto result = rtc::CopyOnWriteBuffer();
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result.AppendData(writer.Data(), writer.Length());
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return result;
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}
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absl::optional<Message> DeserializeMessage(
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rtc::ByteBufferReader &reader,
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bool singleMessagePacket) {
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if (!reader.Length()) {
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return absl::nullopt;
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}
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using Variant = decltype(std::declval<Message>().data);
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auto result = absl::make_optional<Message>();
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return TryDeserializeRecursive(result, reader, singleMessagePacket, (Variant*)nullptr)
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? result
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: absl::nullopt;
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}
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absl::optional<rtc::CopyOnWriteBuffer> DeserializeRawMessage(
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rtc::ByteBufferReader &reader,
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bool singleMessagePacket) {
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if (!reader.Length()) {
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return absl::nullopt;
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}
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uint32_t length = 0;
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if (!reader.ReadUInt32(&length)) {
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return absl::nullopt;
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}
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if (/*length < 0 || */length > 1024 * 1024) {
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return absl::nullopt;
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}
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rtc::CopyOnWriteBuffer result;
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result.SetSize(length);
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if (!reader.ReadBytes((char *)result.MutableData(), result.size())) {
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return absl::nullopt;
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}
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return result;
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}
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} // namespace tgcalls
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