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@ -288,19 +288,14 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
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internal static int WriteGetMessage(Span<byte> buffer, int tuner, string name)
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{
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var byteName = string.Format(CultureInfo.InvariantCulture, "/tuner{0}/{1}", tuner, name);
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int offset = WriteHeaderAndName(buffer, byteName);
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// calculate crc and insert at the end of the message
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var crc = Crc32.Compute(buffer.Slice(0, offset));
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BinaryPrimitives.WriteUInt32LittleEndian(buffer.Slice(offset), crc);
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return offset + 4;
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int offset = WriteHeaderAndPayload(buffer, byteName);
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return FinishPacket(buffer, offset);
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}
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private static int WriteSetMessage(Span<byte> buffer, int tuner, string name, string value, uint? lockkey)
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{
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var byteName = string.Format(CultureInfo.InvariantCulture, "/tuner{0}/{1}", tuner, name);
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int offset = WriteHeaderAndName(buffer, byteName);
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int offset = WriteHeaderAndPayload(buffer, byteName);
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buffer[offset++] = GetSetValue;
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offset += WriteNullTerminatedString(buffer.Slice(offset), value);
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@ -313,17 +308,14 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
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offset += 4;
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}
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// calculate crc and insert at the end of the message
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var crc = Crc32.Compute(buffer.Slice(0, offset));
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BinaryPrimitives.WriteUInt32LittleEndian(buffer.Slice(offset), crc);
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return offset + 4;
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return FinishPacket(buffer, offset);
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}
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internal static int WriteNullTerminatedString(Span<byte> buffer, ReadOnlySpan<char> value)
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internal static int WriteNullTerminatedString(Span<byte> buffer, ReadOnlySpan<char> payload)
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{
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int len = Encoding.UTF8.GetBytes(value, buffer.Slice(1)) + 1;
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int len = Encoding.UTF8.GetBytes(payload, buffer.Slice(1)) + 1;
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// TODO: variable length: this can be 2 bytes if len > 127
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// Write length in front of value
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buffer[0] = Convert.ToByte(len);
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@ -333,21 +325,36 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
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return len;
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}
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private static int WriteHeaderAndName(Span<byte> buffer, ReadOnlySpan<char> payload)
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private static int WriteHeaderAndPayload(Span<byte> buffer, ReadOnlySpan<char> payload)
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{
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// insert header bytes into message
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// Packet type
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BinaryPrimitives.WriteUInt16BigEndian(buffer, GetSetRequest);
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int offset = 2;
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// Subtract 4 bytes for header and 4 bytes for crc
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BinaryPrimitives.WriteUInt16BigEndian(buffer.Slice(offset), (ushort)(payload.Length + 2));
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// insert tag name and length
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// We write the payload length at the end
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int offset = 4;
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// Tag
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buffer[offset++] = GetSetName;
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offset += WriteNullTerminatedString(buffer.Slice(offset), payload);
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// Payload length + data
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int strLen = WriteNullTerminatedString(buffer.Slice(offset), payload);
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offset += strLen;
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return offset;
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}
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private static int FinishPacket(Span<byte> buffer, int offset)
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{
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// Payload length
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BinaryPrimitives.WriteUInt16BigEndian(buffer.Slice(2), (ushort)(offset - 4));
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// calculate crc and insert at the end of the message
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var crc = Crc32.Compute(buffer.Slice(0, offset));
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BinaryPrimitives.WriteUInt32LittleEndian(buffer.Slice(offset), crc);
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return offset + 4;
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}
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private static bool ParseReturnMessage(byte[] buf, int numBytes, out string returnVal)
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{
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returnVal = string.Empty;
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