internal static uint?ReadUInt32Wrapper(ref ReadOnlySpan <byte> buffer, ref ParserInternalState state)
{
// field=1, type=varint = tag of 8
const int expectedTag = 8;
// length:1 + tag:1 + value:10(varint64-max) = 12 bytes
// Value can be 64 bits for negative integers
if (state.bufferPos + 12 <= state.bufferSize)
{
// The entire wrapper message is already contained in `buffer`.
int pos0 = state.bufferPos;
int length = buffer[state.bufferPos++];
if (length == 0)
{
return(0);
}
// Length will always fit in a single byte.
if (length >= 128)
{
state.bufferPos = pos0;
return(ReadUInt32WrapperSlow(ref buffer, ref state));
}
int finalBufferPos = state.bufferPos + length;
if (buffer[state.bufferPos++] != expectedTag)
{
state.bufferPos = pos0;
return(ReadUInt32WrapperSlow(ref buffer, ref state));
}
var result = ParsingPrimitives.ParseRawVarint32(ref buffer, ref state);
// Verify this message only contained a single field.
if (state.bufferPos != finalBufferPos)
{
state.bufferPos = pos0;
return(ReadUInt32WrapperSlow(ref buffer, ref state));
}
return(result);
}
else
{
return(ReadUInt32WrapperSlow(ref buffer, ref state));
}
}
public static void ReadMessage(ref ParseContext ctx, IMessage message)
{
int length = ParsingPrimitives.ParseLength(ref ctx.buffer, ref ctx.state);
if (ctx.state.recursionDepth >= ctx.state.recursionLimit)
{
throw InvalidProtocolBufferException.RecursionLimitExceeded();
}
int oldLimit = SegmentedBufferHelper.PushLimit(ref ctx.state, length);
++ctx.state.recursionDepth;
ReadRawMessage(ref ctx, message);
CheckReadEndOfStreamTag(ref ctx.state);
// Check that we've read exactly as much data as expected.
if (!SegmentedBufferHelper.IsReachedLimit(ref ctx.state))
{
throw InvalidProtocolBufferException.TruncatedMessage();
}
--ctx.state.recursionDepth;
SegmentedBufferHelper.PopLimit(ref ctx.state, oldLimit);
}
/// <summary>
/// Skip a group.
/// </summary>
public static void SkipGroup(ref ReadOnlySpan <byte> buffer, ref ParserInternalState state, uint startGroupTag)
{
// Note: Currently we expect this to be the way that groups are read. We could put the recursion
// depth changes into the ReadTag method instead, potentially...
state.recursionDepth++;
if (state.recursionDepth >= state.recursionLimit)
{
throw InvalidProtocolBufferException.RecursionLimitExceeded();
}
uint tag;
while (true)
{
tag = ParsingPrimitives.ParseTag(ref buffer, ref state);
if (tag == 0)
{
throw InvalidProtocolBufferException.TruncatedMessage();
}
// Can't call SkipLastField for this case- that would throw.
if (WireFormat.GetTagWireType(tag) == WireFormat.WireType.EndGroup)
{
break;
}
// This recursion will allow us to handle nested groups.
SkipLastField(ref buffer, ref state);
}
int startField = WireFormat.GetTagFieldNumber(startGroupTag);
int endField = WireFormat.GetTagFieldNumber(tag);
if (startField != endField)
{
throw new InvalidProtocolBufferException(
$"Mismatched end-group tag. Started with field {startField}; ended with field {endField}");
}
state.recursionDepth--;
}
public int ReadEnum()
{
// Currently just a pass-through, but it's nice to separate it logically from WriteInt32.
return((int)ParsingPrimitives.ParseRawVarint32(ref buffer, ref state));
}
public static string ReadString(ref ReadOnlySpan <byte> buffer, ref ParserInternalState state)
{
int length = ParsingPrimitives.ParseLength(ref buffer, ref state);
return(ParsingPrimitives.ReadRawString(ref buffer, ref state, length));
}
public static ByteString ReadBytes(ref ReadOnlySpan <byte> buffer, ref ParserInternalState state)
{
int length = ParsingPrimitives.ParseLength(ref buffer, ref state);
return(ByteString.AttachBytes(ParsingPrimitives.ReadRawBytes(ref buffer, ref state, length)));
}
public long ReadSInt64()
{
return(ParsingPrimitives.DecodeZigZag64(ParsingPrimitives.ParseRawVarint64(ref buffer, ref state)));
}
public int ReadLength()
{
return((int)ParsingPrimitives.ParseRawVarint32(ref buffer, ref state));
}
public long ReadSFixed64()
{
return((long)ParsingPrimitives.ParseRawLittleEndian64(ref buffer, ref state));
}
public int ReadSInt32()
{
return(ParsingPrimitives.DecodeZigZag32(ParsingPrimitives.ParseRawVarint32(ref buffer, ref state)));
}
public float ReadFloat()
{
return(ParsingPrimitives.ParseFloat(ref buffer, ref state));
}
public double ReadDouble()
{
return(ParsingPrimitives.ParseDouble(ref buffer, ref state));
}
public uint ReadUInt32()
{
return(ParsingPrimitives.ParseRawVarint32(ref buffer, ref state));
}
public ByteString ReadBytes()
{
return(ParsingPrimitives.ReadBytes(ref buffer, ref state));
}
public string ReadString()
{
return(ParsingPrimitives.ReadString(ref buffer, ref state));
}
public bool ReadBool()
{
return(ParsingPrimitives.ParseRawVarint64(ref buffer, ref state) != 0);
}
public long ReadInt64()
{
return((long)ParsingPrimitives.ParseRawVarint64(ref buffer, ref state));
}
public int ReadSFixed32()
{
return((int)ParsingPrimitives.ParseRawLittleEndian32(ref buffer, ref state));
}
public uint ReadTag()
{
return(ParsingPrimitives.ParseTag(ref buffer, ref state));
}