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CborReader.Simple.cs
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CborReader.Simple.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Buffers.Binary;
namespace System.Formats.Cbor
{
public partial class CborReader
{
/// <summary>Reads the next data item as a single-precision floating point number (major type 7).</summary>
/// <returns>The decoded value.</returns>
/// <exception cref="InvalidOperationException"><para>The next data item does not have the correct major type.</para>
/// <para>-or-</para>
/// <para>The next simple value is not a floating-point number encoding.</para>
/// <para>-or-</para>
/// <para>The encoded value is a double-precision float.</para></exception>
/// <exception cref="CborContentException"><para>The next value has an invalid CBOR encoding.</para>
/// <para>-or-</para>
/// <para>There was an unexpected end of CBOR encoding data.</para>
/// <para>-or-</para>
/// <para>The next value uses a CBOR encoding that is not valid under the current conformance mode.</para></exception>
public float ReadSingle()
{
CborInitialByte header = PeekInitialByte(expectedType: CborMajorType.Simple);
ReadOnlySpan<byte> buffer = GetRemainingBytes();
float result;
switch (header.AdditionalInfo)
{
case CborAdditionalInfo.Additional16BitData:
EnsureReadCapacity(buffer, 1 + sizeof(ushort));
result = HalfHelpers.HalfToFloat(CborHelpers.ReadHalfBigEndian(buffer.Slice(1)));
AdvanceBuffer(1 + sizeof(ushort));
AdvanceDataItemCounters();
return result;
case CborAdditionalInfo.Additional32BitData:
EnsureReadCapacity(buffer, 1 + sizeof(float));
result = CborHelpers.ReadSingleBigEndian(buffer.Slice(1));
AdvanceBuffer(1 + sizeof(float));
AdvanceDataItemCounters();
return result;
case CborAdditionalInfo.Additional64BitData:
throw new InvalidOperationException(SR.Cbor_Reader_ReadingAsLowerPrecision);
default:
throw new InvalidOperationException(SR.Cbor_Reader_NotAFloatEncoding);
}
}
/// <summary>Reads the next data item as a double-precision floating point number (major type 7).</summary>
/// <returns>The decoded <see cref="double" /> value.</returns>
/// <exception cref="InvalidOperationException"><para>The next data item does not have the correct major type.</para>
/// <para>-or-</para>
/// <para>The next simple value is not a floating-point number encoding.</para></exception>
/// <exception cref="CborContentException"><para>The next value has an invalid CBOR encoding.</para>
/// <para>-or-</para>
/// <para>There was an unexpected end of CBOR encoding data.</para>
/// <para>-or-</para>
/// <para>The next value uses a CBOR encoding that is not valid under the current conformance mode.</para></exception>
public double ReadDouble()
{
CborInitialByte header = PeekInitialByte(expectedType: CborMajorType.Simple);
ReadOnlySpan<byte> buffer = GetRemainingBytes();
double result;
switch (header.AdditionalInfo)
{
case CborAdditionalInfo.Additional16BitData:
EnsureReadCapacity(buffer, 1 + sizeof(short));
result = HalfHelpers.HalfToDouble(CborHelpers.ReadHalfBigEndian(buffer.Slice(1)));
AdvanceBuffer(1 + sizeof(short));
AdvanceDataItemCounters();
return result;
case CborAdditionalInfo.Additional32BitData:
EnsureReadCapacity(buffer, 1 + sizeof(float));
result = CborHelpers.ReadSingleBigEndian(buffer.Slice(1));
AdvanceBuffer(1 + sizeof(float));
AdvanceDataItemCounters();
return result;
case CborAdditionalInfo.Additional64BitData:
EnsureReadCapacity(buffer, 1 + sizeof(double));
result = CborHelpers.ReadDoubleBigEndian(buffer.Slice(1));
AdvanceBuffer(1 + sizeof(double));
AdvanceDataItemCounters();
return result;
default:
throw new InvalidOperationException(SR.Cbor_Reader_NotAFloatEncoding);
}
}
/// <summary>Reads the next data item as a boolean value (major type 7).</summary>
/// <returns>The decoded value.</returns>
/// <exception cref="InvalidOperationException"><para>The next data item does not have the correct major type.</para>
/// <para>-or-</para>
/// <para>The next simple value is not a boolean encoding.</para></exception>
/// <exception cref="CborContentException"><para>The next value has an invalid CBOR encoding.</para>
/// <para>-or-</para>
/// <para>There was an unexpected end of CBOR encoding data.</para>
/// <para>-or-</para>
/// <para>The next value uses a CBOR encoding that is not valid under the current conformance mode.</para></exception>
public bool ReadBoolean()
{
CborInitialByte header = PeekInitialByte(expectedType: CborMajorType.Simple);
bool result = header.AdditionalInfo switch
{
(CborAdditionalInfo)CborSimpleValue.False => false,
(CborAdditionalInfo)CborSimpleValue.True => true,
_ => throw new InvalidOperationException(SR.Cbor_Reader_NotABooleanEncoding),
};
AdvanceBuffer(1);
AdvanceDataItemCounters();
return result;
}
/// <summary>Reads the next data item as a <see langword="null" /> value (major type 7).</summary>
/// <exception cref="InvalidOperationException"><para>The next data item does not have the correct major type.</para>
/// <para>-or-</para>
/// <para>The next simple value is not a <see langword="null" /> value encoding.</para></exception>
/// <exception cref="CborContentException"><para>The next value has an invalid CBOR encoding.</para>
/// <para>-or-</para>
/// <para>There was an unexpected end of CBOR encoding data.</para>
/// <para>-or-</para>
/// <para>The next value uses a CBOR encoding that is not valid under the current conformance mode.</para></exception>
public void ReadNull()
{
CborInitialByte header = PeekInitialByte(expectedType: CborMajorType.Simple);
switch (header.AdditionalInfo)
{
case (CborAdditionalInfo)CborSimpleValue.Null:
AdvanceBuffer(1);
AdvanceDataItemCounters();
return;
default:
throw new InvalidOperationException(SR.Cbor_Reader_NotANullEncoding);
}
}
/// <summary>Reads the next data item as a CBOR simple value (major type 7).</summary>
/// <returns>The decoded CBOR simple value.</returns>
/// <exception cref="InvalidOperationException"><para>The next data item does not have the correct major type.</para>
/// <para>-or-</para>
/// <para>The next simple value is not a simple value encoding.</para></exception>
/// <exception cref="CborContentException"><para>The next value has an invalid CBOR encoding.</para>
/// <para>-or-</para>
/// <para>There was an unexpected end of CBOR encoding data.</para>
/// <para>-or-</para>
/// <para>The next value uses a CBOR encoding that is not valid under the current conformance mode.</para></exception>
public CborSimpleValue ReadSimpleValue()
{
CborInitialByte header = PeekInitialByte(expectedType: CborMajorType.Simple);
switch (header.AdditionalInfo)
{
case CborAdditionalInfo info when info < CborAdditionalInfo.Additional8BitData:
AdvanceBuffer(1);
AdvanceDataItemCounters();
return (CborSimpleValue)header.AdditionalInfo;
case CborAdditionalInfo.Additional8BitData:
EnsureReadCapacity(2);
byte value = _data.Span[_offset + 1];
if (value <= (byte)CborAdditionalInfo.IndefiniteLength &&
_isConformanceModeCheckEnabled &&
CborConformanceModeHelpers.RequireCanonicalSimpleValueEncodings(ConformanceMode))
{
throw new CborContentException(SR.Format(SR.Cbor_ConformanceMode_InvalidSimpleValueEncoding, ConformanceMode));
}
AdvanceBuffer(2);
AdvanceDataItemCounters();
return (CborSimpleValue)value;
default:
throw new InvalidOperationException(SR.Cbor_Reader_NotASimpleValueEncoding);
}
}
}
}