public static bool TryRead <T>(EtfSerializer serializer, ref ReadOnlySpan <byte> remaining, out T[] result,
PropertyMap propMap, ValueConverter <T> innerConverter, ArrayPool <T> itemPool, ArrayPool <byte> bytePool)
{
result = default;
int resultCount = 0;
switch (EtfReader.GetTokenType(ref remaining))
{
case EtfTokenType.SmallTuple:
{
if (remaining.Length < 2)
{
return(false);
}
// remaining = remaining.Slice(1);
byte count = remaining[1];
remaining = remaining.Slice(2);
result = new T[count];
for (int i = 0; i < count; i++, resultCount++)
{
var restore = remaining;
if (!innerConverter.TryRead(ref remaining, out result[resultCount], propMap))
{
if (propMap?.IgnoreErrors == true)
{
remaining = restore;
if (!EtfReader.Skip(ref remaining, out _))
{
return(false);
}
serializer.RaiseFailedProperty(propMap, i);
resultCount--;
}
else
{
return(false);
}
}
}
break;
}
case EtfTokenType.LargeTuple:
{
if (remaining.Length < 5)
{
return(false);
}
remaining = remaining.Slice(1);
uint count = BinaryPrimitives.ReadUInt32BigEndian(remaining);
remaining = remaining.Slice(4);
if (count > int.MaxValue)
{
return(false);
}
result = new T[count];
for (int i = 0; i < count; i++, resultCount++)
{
var restore = remaining;
if (!innerConverter.TryRead(ref remaining, out result[resultCount], propMap))
{
if (propMap?.IgnoreErrors == true)
{
remaining = restore;
if (!EtfReader.Skip(ref remaining, out _))
{
return(false);
}
serializer.RaiseFailedProperty(propMap, i);
resultCount--;
}
else
{
return(false);
}
}
}
break;
}
case EtfTokenType.List:
{
if (remaining.Length < 5)
{
return(false);
}
remaining = remaining.Slice(1);
uint count = BinaryPrimitives.ReadUInt32BigEndian(remaining);
remaining = remaining.Slice(4);
if (count > int.MaxValue)
{
return(false);
}
result = new T[count];
for (int i = 0; i < count; i++, resultCount++)
{
var restore = remaining;
if (!innerConverter.TryRead(ref remaining, out result[resultCount], propMap))
{
if (propMap?.IgnoreErrors == true)
{
remaining = restore;
if (!EtfReader.Skip(ref remaining, out _))
{
return(false);
}
serializer.RaiseFailedProperty(propMap, i);
resultCount--;
}
else
{
return(false);
}
}
}
// Tail element
if (EtfReader.GetTokenType(ref remaining) != EtfTokenType.Nil)
{
return(false);
}
remaining = remaining.Slice(1);
break;
}
case EtfTokenType.String:
{
if (remaining.Length < 3)
{
return(false);
}
remaining = remaining.Slice(1);
ushort count = BinaryPrimitives.ReadUInt16BigEndian(remaining);
remaining = remaining.Slice(2);
if (remaining.Length < count)
{
return(false);
}
// String optimizes away the per-item header, but our item readers depend on them.
// Unfortunately this means we need to inject a header
// In the case of reading a byte[] however, we can do a direct copy
if (typeof(T) == typeof(byte))
{
result = new T[count];
remaining.Slice(0, count).CopyTo((result as byte[]).AsSpan());
remaining = remaining.Slice(count);
}
else
{
var tmpArr = bytePool.Rent(2);
try
{
tmpArr[0] = (byte)EtfTokenType.SmallInteger;
result = new T[count];
for (int i = 0; i < count; i++, resultCount++)
{
tmpArr[1] = remaining[i];
var span = new ReadOnlySpan <byte>(tmpArr, 0, 2);
if (!innerConverter.TryRead(ref span, out result[resultCount], propMap))
{
if (propMap?.IgnoreErrors == true)
{
serializer.RaiseFailedProperty(propMap, i);
resultCount--;
}
else
{
return(false);
}
}
}
remaining = remaining.Slice(count);
}
finally { bytePool.Return(tmpArr); }
}
break;
}
case EtfTokenType.Binary:
{
if (remaining.Length < 5)
{
return(false);
}
remaining = remaining.Slice(1);
uint count = BinaryPrimitives.ReadUInt32BigEndian(remaining);
if (count > int.MaxValue || remaining.Length < count + 4U)
{
return(false);
}
remaining = remaining.Slice(4);
if (remaining.Length < count)
{
return(false);
}
// String optimizes away the per-item header, but our item readers depend on them.
// Unfortunately this means we need to inject a header
// In the case of reading a byte[] however, we can do a direct copy
if (typeof(T) == typeof(byte))
{
result = new T[count];
remaining.Slice(0, (int)count).CopyTo((result as byte[]).AsSpan());
remaining = remaining.Slice((int)count);
}
else
{
var tmpArr = bytePool.Rent(2);
try
{
tmpArr[0] = (byte)EtfTokenType.SmallInteger;
result = new T[count];
for (int i = 0; i < count; i++, resultCount++)
{
tmpArr[1] = remaining[i];
var span = new ReadOnlySpan <byte>(tmpArr, 0, 2);
if (!innerConverter.TryRead(ref span, out result[resultCount], propMap))
{
if (propMap?.IgnoreErrors == true)
{
serializer.RaiseFailedProperty(propMap, i);
resultCount--;
}
else
{
return(false);
}
}
}
remaining = remaining.Slice((int)count);
}
finally { bytePool.Return(tmpArr); }
}
break;
}
default:
return(false);
}
// Resize array if any elements failed
if (resultCount != result.Length)
{
Array.Resize(ref result, resultCount);
}
return(true);
}
public ListEtfConverter(EtfSerializer serializer, ValueConverter <T> innerConverter, ArrayPool <T> pool = null)
{
_serializer = serializer;
_innerConverter = innerConverter;
_pool = pool;
}
public ObjectEtfConverter(EtfSerializer serializer)
{
_serializer = serializer;
_map = serializer.GetMap <T>();
}