| public static GetTagFieldNumber ( uint tag ) : int | ||
| tag | uint | |
| return | int | |
/// <summary>
/// Tries to merge a field from the coded input, returning true if the field was merged.
/// If the set is null or the field was not otherwise merged, this returns false.
/// </summary>
public static bool TryMergeFieldFrom <TTarget>(ref ExtensionSet <TTarget> set, CodedInputStream stream) where TTarget : IExtendableMessage <TTarget>
{
Extension extension;
int lastFieldNumber = WireFormat.GetTagFieldNumber(stream.LastTag);
IExtensionValue extensionValue;
if (set != null && set.ValuesByNumber.TryGetValue(lastFieldNumber, out extensionValue))
{
extensionValue.MergeFrom(stream);
return(true);
}
else if (stream.ExtensionRegistry != null && stream.ExtensionRegistry.ContainsInputField(stream, typeof(TTarget), out extension))
{
IExtensionValue value = extension.CreateValue();
value.MergeFrom(stream);
set = (set ?? new ExtensionSet <TTarget>());
set.ValuesByNumber.Add(extension.FieldNumber, value);
return(true);
}
else
{
return(false);
}
}
private void SkipGroup(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...
recursionDepth++;
if (recursionDepth >= recursionLimit)
{
throw InvalidProtocolBufferException.RecursionLimitExceeded();
}
uint tag;
while (true)
{
tag = ReadTag();
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();
}
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);
}
recursionDepth--;
}
/// <summary>
/// Parse a single field from <paramref name="input"/> and merge it
/// into this set.
/// </summary>
/// <param name="input">The coded input stream containing the field</param>
/// <returns>false if the tag is an "end group" tag, true otherwise</returns>
private bool MergeFieldFrom(CodedInputStream input)
{
uint tag = input.LastTag;
int number = WireFormat.GetTagFieldNumber(tag);
switch (WireFormat.GetTagWireType(tag))
{
case WireFormat.WireType.Varint:
{
ulong uint64 = input.ReadUInt64();
GetOrAddField(number).AddVarint(uint64);
return(true);
}
case WireFormat.WireType.Fixed32:
{
uint uint32 = input.ReadFixed32();
GetOrAddField(number).AddFixed32(uint32);
return(true);
}
case WireFormat.WireType.Fixed64:
{
ulong uint64 = input.ReadFixed64();
GetOrAddField(number).AddFixed64(uint64);
return(true);
}
case WireFormat.WireType.LengthDelimited:
{
ByteString bytes = input.ReadBytes();
GetOrAddField(number).AddLengthDelimited(bytes);
return(true);
}
case WireFormat.WireType.StartGroup:
{
uint endTag = WireFormat.MakeTag(number, WireFormat.WireType.EndGroup);
UnknownFieldSet set = new UnknownFieldSet();
while (input.ReadTag() != endTag)
{
set.MergeFieldFrom(input);
}
GetOrAddField(number).AddGroup(set);
return(true);
}
case WireFormat.WireType.EndGroup:
{
return(false);
}
default:
throw InvalidProtocolBufferException.InvalidWireType();
}
}
/// <summary>
/// Reads a field tag, returning the tag of 0 for "end of stream".
/// </summary>
/// <remarks>
/// If this method returns 0, it doesn't necessarily mean the end of all
/// the data in this CodedInputStream; it may be the end of the logical stream
/// for an embedded message, for example.
/// </remarks>
/// <returns>The next field tag, or 0 for end of stream. (0 is never a valid tag.)</returns>
public uint ReadTag()
{
if (hasNextTag)
{
lastTag = nextTag;
hasNextTag = false;
return(lastTag);
}
// Optimize for the incredibly common case of having at least two bytes left in the buffer,
// and those two bytes being enough to get the tag. This will be true for fields up to 4095.
if (bufferPos + 2 <= bufferSize)
{
int tmp = buffer[bufferPos++];
if (tmp < 128)
{
lastTag = (uint)tmp;
}
else
{
int result = tmp & 0x7f;
if ((tmp = buffer[bufferPos++]) < 128)
{
result |= tmp << 7;
lastTag = (uint)result;
}
else
{
// Nope, rewind and go the potentially slow route.
bufferPos -= 2;
lastTag = ReadRawVarint32();
}
}
}
else
{
if (IsAtEnd)
{
lastTag = 0;
return(0);
}
lastTag = ReadRawVarint32();
}
if (WireFormat.GetTagFieldNumber(lastTag) == 0)
{
// If we actually read a tag with a field of 0, that's not a valid tag.
throw InvalidProtocolBufferException.InvalidTag();
}
if (ReachedLimit)
{
return(0);
}
return(lastTag);
}
/// <summary>
/// Parses the next tag.
/// If the end of logical stream was reached, an invalid tag of 0 is returned.
/// </summary>
public static uint ParseTag(ref ReadOnlySpan <byte> buffer, ref ParserInternalState state)
{
// The "nextTag" logic is there only as an optimization for reading non-packed repeated / map
// fields and is strictly speaking not necessary.
// TODO(jtattermusch): look into simplifying the ParseTag logic.
if (state.hasNextTag)
{
state.lastTag = state.nextTag;
state.hasNextTag = false;
return(state.lastTag);
}
// Optimize for the incredibly common case of having at least two bytes left in the buffer,
// and those two bytes being enough to get the tag. This will be true for fields up to 4095.
if (state.bufferPos + 2 <= state.bufferSize)
{
int tmp = buffer[state.bufferPos++];
if (tmp < 128)
{
state.lastTag = (uint)tmp;
}
else
{
int result = tmp & 0x7f;
if ((tmp = buffer[state.bufferPos++]) < 128)
{
result |= tmp << 7;
state.lastTag = (uint)result;
}
else
{
// Nope, rewind and go the potentially slow route.
state.bufferPos -= 2;
state.lastTag = ParsingPrimitives.ParseRawVarint32(ref buffer, ref state);
}
}
}
else
{
if (SegmentedBufferHelper.IsAtEnd(ref buffer, ref state))
{
state.lastTag = 0;
return(0);
}
state.lastTag = ParsingPrimitives.ParseRawVarint32(ref buffer, ref state);
}
if (WireFormat.GetTagFieldNumber(state.lastTag) == 0)
{
// If we actually read a tag with a field of 0, that's not a valid tag.
throw InvalidProtocolBufferException.InvalidTag();
}
return(state.lastTag);
}
/// <summary>
/// Parse a single field from <paramref name="ctx"/> and merge it
/// into this set.
/// </summary>
/// <param name="ctx">The parse context from which to read the field</param>
/// <returns>false if the tag is an "end group" tag, true otherwise</returns>
private bool MergeFieldFrom(ref ParseContext ctx)
{
uint tag = ctx.LastTag;
int number = WireFormat.GetTagFieldNumber(tag);
switch (WireFormat.GetTagWireType(tag))
{
case WireFormat.WireType.Varint:
{
ulong uint64 = ctx.ReadUInt64();
GetOrAddField(number).AddVarint(uint64);
return(true);
}
case WireFormat.WireType.Fixed32:
{
uint uint32 = ctx.ReadFixed32();
GetOrAddField(number).AddFixed32(uint32);
return(true);
}
case WireFormat.WireType.Fixed64:
{
ulong uint64 = ctx.ReadFixed64();
GetOrAddField(number).AddFixed64(uint64);
return(true);
}
case WireFormat.WireType.LengthDelimited:
{
ByteString bytes = ctx.ReadBytes();
GetOrAddField(number).AddLengthDelimited(bytes);
return(true);
}
case WireFormat.WireType.StartGroup:
{
UnknownFieldSet set = new UnknownFieldSet();
ParsingPrimitivesMessages.ReadGroup(ref ctx, number, set);
GetOrAddField(number).AddGroup(set);
return(true);
}
case WireFormat.WireType.EndGroup:
{
return(false);
}
default:
throw InvalidProtocolBufferException.InvalidWireType();
}
}
/// <summary>
/// Parse a single field from <paramref name="input"/> and merge it
/// into this set.
/// </summary>
/// <param name="input">The coded input stream containing the field</param>
/// <returns>false if the tag is an "end group" tag, true otherwise</returns>
private void MergeFieldFrom(CodedInputStream input)
{
uint tag = input.LastTag;
int number = WireFormat.GetTagFieldNumber(tag);
switch (WireFormat.GetTagWireType(tag))
{
case WireFormat.WireType.Varint:
{
ulong uint64 = input.ReadUInt64();
GetOrAddField(number).AddVarint(uint64);
return;
}
case WireFormat.WireType.Fixed32:
{
uint uint32 = input.ReadFixed32();
GetOrAddField(number).AddFixed32(uint32);
return;
}
case WireFormat.WireType.Fixed64:
{
ulong uint64 = input.ReadFixed64();
GetOrAddField(number).AddFixed64(uint64);
return;
}
case WireFormat.WireType.LengthDelimited:
{
ByteString bytes = input.ReadBytes();
GetOrAddField(number).AddLengthDelimited(bytes);
return;
}
case WireFormat.WireType.StartGroup:
{
input.SkipGroup(tag);
return;
}
case WireFormat.WireType.EndGroup:
{
throw new InvalidProtocolBufferException("Merge an unknown field of end-group tag, indicating that the corresponding start-group was missing.");
}
default:
throw new InvalidOperationException("Wire Type is invalid.");
}
}
public static void ReadGroup(ref ParseContext ctx, IMessage message)
{
if (ctx.state.recursionDepth >= ctx.state.recursionLimit)
{
throw InvalidProtocolBufferException.RecursionLimitExceeded();
}
++ctx.state.recursionDepth;
uint tag = ctx.state.lastTag;
int fieldNumber = WireFormat.GetTagFieldNumber(tag);
ReadRawMessage(ref ctx, message);
CheckLastTagWas(ref ctx.state, WireFormat.MakeTag(fieldNumber, WireFormat.WireType.EndGroup));
--ctx.state.recursionDepth;
}
public void MaximumFieldNumber()
{
MemoryStream ms = new MemoryStream();
CodedOutputStream output = new CodedOutputStream(ms);
int fieldNumber = 0x1FFFFFFF;
uint tag = WireFormat.MakeTag(fieldNumber, WireFormat.WireType.LengthDelimited);
output.WriteRawVarint32(tag);
output.WriteString("field 1");
output.Flush();
ms.Position = 0;
CodedInputStream input = new CodedInputStream(ms);
Assert.AreEqual(tag, input.ReadTag());
Assert.AreEqual(fieldNumber, WireFormat.GetTagFieldNumber(tag));
}
public void TestSlowPathAvoidance()
{
using (var ms = new MemoryStream())
{
CodedOutputStream output = new CodedOutputStream(ms);
output.WriteTag(1, WireFormat.WireType.LengthDelimited);
output.WriteBytes(ByteString.CopyFrom(new byte[100]));
output.WriteTag(2, WireFormat.WireType.LengthDelimited);
output.WriteBytes(ByteString.CopyFrom(new byte[100]));
output.Flush();
ms.Position = 0;
CodedInputStream input = new CodedInputStream(ms, new byte[ms.Length / 2], 0, 0, false);
uint tag = input.ReadTag();
Assert.AreEqual(1, WireFormat.GetTagFieldNumber(tag));
Assert.AreEqual(100, input.ReadBytes().Length);
tag = input.ReadTag();
Assert.AreEqual(2, WireFormat.GetTagFieldNumber(tag));
Assert.AreEqual(100, input.ReadBytes().Length);
}
}
/// <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--;
}
internal bool ContainsInputField(CodedInputStream stream, Type target, out Extension extension)
{
return(extensions.TryGetValue(new ObjectIntPair <Type>(target, WireFormat.GetTagFieldNumber(stream.LastTag)), out extension));
}
