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682 lines
16 KiB
C++
682 lines
16 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#include "Pch.h"
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#include "Cbor.h"
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#include "Utils.h"
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// {{{1 misc -------------------------------------------------------------------
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enum ECborMajorType
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{
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Integer = 0 << 5,
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NegativeInteger = 1 << 5,
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ByteString = 2 << 5,
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TextString = 3 << 5,
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Array = 4 << 5,
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Map = 5 << 5,
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Tag = 6 << 5,
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Float_Simple = 7 << 5,
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};
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// {{{1 context ----------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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void FCborContext::Reset()
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{
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NextCursor = nullptr;
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}
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////////////////////////////////////////////////////////////////////////////////
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ECborType FCborContext::GetType() const
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{
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return Type;
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}
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////////////////////////////////////////////////////////////////////////////////
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int64 FCborContext::GetLength() const
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{
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return Param;
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}
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////////////////////////////////////////////////////////////////////////////////
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FStringView FCborContext::AsString() const
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{
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if (GetType() != ECborType::String)
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{
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return FStringView();
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}
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return FStringView((const char*)(NextCursor - Param), Param);
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}
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////////////////////////////////////////////////////////////////////////////////
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int64 FCborContext::AsInteger() const
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{
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return Param;
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}
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////////////////////////////////////////////////////////////////////////////////
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void FCborContext::SetError()
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{
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Type = ECborType::Error;
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Param = -1;
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NextCursor = nullptr;
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}
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// {{{1 writer -----------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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FCborWriter::FCborWriter(FInlineBuffer& InBuffer)
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: Buffer(InBuffer)
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{
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}
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////////////////////////////////////////////////////////////////////////////////
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void FCborWriter::OpenMap(int32 ItemCount)
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{
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if (ItemCount != -1)
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{
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WriteParam(ECborMajorType::Map, ItemCount);
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return;
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}
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uint8 Initial = ECborMajorType::Map | 31;
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Buffer.Append(&Initial, sizeof(Initial));
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}
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////////////////////////////////////////////////////////////////////////////////
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void FCborWriter::OpenArray(int32 ItemCount)
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{
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if (ItemCount != -1)
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{
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WriteParam(ECborMajorType::Array, ItemCount);
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return;
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}
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uint8 Initial = ECborMajorType::Array | 31;
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Buffer.Append(&Initial, sizeof(Initial));
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}
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////////////////////////////////////////////////////////////////////////////////
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void FCborWriter::Close()
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{
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uint8 Initial = ECborMajorType::Float_Simple | 31;
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Buffer.Append(&Initial, sizeof(Initial));
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}
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////////////////////////////////////////////////////////////////////////////////
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void FCborWriter::WriteString(const char* Value, int32 Length)
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{
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Length = (Length < 0) ? int32(strlen(Value)) : Length;
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WriteParam(ECborMajorType::TextString, Length);
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Buffer.Append(Value, Length);
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}
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////////////////////////////////////////////////////////////////////////////////
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void FCborWriter::WriteInteger(int64 Value)
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{
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uint32 Negative = (Value < 0);
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if (Negative)
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{
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Value = ~Value;
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}
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uint32 MajorType = Negative ? ECborMajorType::NegativeInteger : ECborMajorType::Integer;
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WriteParam(MajorType, Value);
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}
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////////////////////////////////////////////////////////////////////////////////
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void FCborWriter::WriteParam(uint32 MajorType, uint64 Value)
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{
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if (Value <= 23)
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{
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uint8 Initial = MajorType | uint8(Value);
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Buffer.Append(&Initial, 1);
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return;
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}
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uint32 BytesPow2 = 3;
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BytesPow2 -= int32(Value <= 0xffff'ffffu);
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BytesPow2 -= int32(Value <= 0x0000'ffffu);
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BytesPow2 -= int32(Value <= 0x0000'00ffu);
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Value = ((Value & 0xffff'ffff'0000'0000ull) >> 32) | ((Value & 0x0000'0000'ffff'ffffull) << 32);
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Value = ((Value & 0xffff'0000'ffff'0000ull) >> 16) | ((Value & 0x0000'ffff'0000'ffffull) << 16);
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Value = ((Value & 0xff00'ff00'ff00'ff00ull) >> 8) | ((Value & 0x00ff'00ff'00ff'00ffull) << 8);
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Value >>= 64 - (8 << BytesPow2);
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struct {
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uint8 Initial;
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uint8 Payload[sizeof(Value)];
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} Packet = {
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uint8(MajorType | (24 + BytesPow2)),
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};
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memcpy(Packet.Payload, &Value, sizeof(Value));
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Buffer.Append(&Packet, 1 + (1 << BytesPow2));
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}
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// {{{1 reader -----------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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FCborReader::FCborReader(const uint8* Data, uint32 DataSize)
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: Base(Data)
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, DataEnd(Data + DataSize)
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{
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}
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////////////////////////////////////////////////////////////////////////////////
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int64 FCborReader::ReadParam(const uint8*& Cursor)
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{
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uint32 Additional = *Cursor & 0b0001'1111;
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++Cursor;
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// [0-23] literal values
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if (uint32(23 - Additional) <= 23)
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{
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return Additional;
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}
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// [24-27] value in subsequent bytes
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else if (uint32(27 - Additional) <= 27)
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{
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uint32 Bytes = 1 << (Additional - 24);
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if (Cursor + Bytes > DataEnd)
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{
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return -2;
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}
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int64 Value = 0;
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do
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{
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Value <<= 8;
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Value |= *Cursor;
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++Cursor;
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}
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while (--Bytes);
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return Value;
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}
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// 31: indeterminate length
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else if (Additional == 31)
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{
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return -1;
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}
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// ...something went wrong
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return -2;
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}
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////////////////////////////////////////////////////////////////////////////////
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bool FCborReader::ReadContainer(FCborContext& Context, const uint8* Cursor)
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{
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bool bIsMap = (*Cursor >= ECborMajorType::Map);
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int64 Param = ReadParam(Cursor);
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if (Param <= -2)
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{
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Context.SetError();
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return false;
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}
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Context.Type = bIsMap ? ECborType::Map : ECborType::Array;
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Context.NextCursor = Cursor;
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Context.Param = Param;
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return true;
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}
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////////////////////////////////////////////////////////////////////////////////
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bool FCborReader::ReadInteger(FCborContext& Context, const uint8* Cursor)
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{
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bool bIsNegative = (*Cursor >= ECborMajorType::NegativeInteger);
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int64 Param = ReadParam(Cursor);
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if (Param <= -1)
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{
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Context.SetError();
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return false;
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}
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Context.Type = ECborType::Integer;
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Context.NextCursor = Cursor;
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Context.Param = bIsNegative ? ~Param : Param;
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return true;
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}
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////////////////////////////////////////////////////////////////////////////////
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bool FCborReader::ReadString(FCborContext& Context, const uint8* Cursor)
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{
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int64 Param = ReadParam(Cursor);
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if (Param <= -2)
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{
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Context.SetError();
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return false;
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}
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else if (Param >= 0)
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{
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if ((Cursor + Param) > DataEnd)
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{
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Context.SetError();
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return false;
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}
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Cursor += Param;
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}
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Context.Type = ECborType::String;
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Context.NextCursor = Cursor;
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Context.Param = Param;
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return true;
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}
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////////////////////////////////////////////////////////////////////////////////
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bool FCborReader::ReadNext(FCborContext& Context)
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{
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const uint8* Cursor = (Context.NextCursor == nullptr) ? Base : Context.NextCursor;
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if (Cursor >= DataEnd)
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{
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Context.Type = ECborType::Eof;
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Context.Param = -1;
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return false;
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}
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int64 Param;
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switch (*Cursor & 0b1110'0000)
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{
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case ECborMajorType::Integer:
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case ECborMajorType::NegativeInteger:
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return ReadInteger(Context, Cursor);
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case ECborMajorType::ByteString:
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case ECborMajorType::TextString:
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return ReadString(Context, Cursor);
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case ECborMajorType::Array:
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case ECborMajorType::Map:
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return ReadContainer(Context, Cursor);
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case ECborMajorType::Tag:
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/* unsupported */
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break;
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case ECborMajorType::Float_Simple:
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Param = *Cursor & 0b0001'1111;
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++Cursor;
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switch (Param)
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{
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case 24:
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if (Cursor >= DataEnd)
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{
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Context.SetError();
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return false;
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}
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switch (*Cursor)
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{
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case 20: // false
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case 21: // true
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case 22: // null
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case 23: // undefined
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break;
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}
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break;
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case 25: // half
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case 26: // float
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case 27: // double
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/* if (Cursor + float_size > DataEnd) "basil!" / Context.SetError() */
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break;
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case 31:
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Context.Type = ECborType::End;
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Context.NextCursor = Cursor;
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Context.Param = -1;
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return false; // "false" to facilitate ReadNext() in loops
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}
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// 31 = break
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break;
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}
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return false;
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}
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// {{{1 test-read --------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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#if defined(_MSC_VER)
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# define DEBUG_BREAK() do { __debugbreak(); } while (0)
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#else
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# define DEBUG_BREAK() do { __builtin_trap(); } while (0)
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#endif
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#define REQUIRE(x) \
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do { \
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if (!(x)) \
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DEBUG_BREAK(); \
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} while (false)
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////////////////////////////////////////////////////////////////////////////////
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static void TestCborReader_Integer()
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{
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struct
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{
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int64 Expected;
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uint32 TruthSize;
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uint8 Truth[9];
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} Cases[] = {
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{ 0, 1, { 0x00 } },
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{ 0, 2, { 0x18, 0x00 } },
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{ 0, 3, { 0x19, 0x00, 0x00 } },
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{ 0, 5, { 0x1a, 0x00, 0x00, 0x00, 0x00 } },
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{ 0, 9, { 0x1b, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } },
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{ 1, 1, { 0x01 } },
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{ 23, 1, { 0x17 } },
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{ 24, 2, { 0x18, 0x18 } },
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{ 255, 2, { 0x18, 0xff } },
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{ 256, 3, { 0x19, 0x01, 0x00 } },
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{ 65535, 3, { 0x19, 0xff, 0xff } },
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{ 65536, 5, { 0x1a, 0x00, 0x01, 0x00, 0x00 } },
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{ 123456, 5, { 0x1a, 0x00, 0x01, 0xe2, 0x40 } },
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{ 123456789, 5, { 0x1a, 0x07, 0x5b, 0xcd, 0x15 } },
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{ -1, 1, { 0x20 } },
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{ -2, 1, { 0x21 } },
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{ -10, 1, { 0x29 } },
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{ -24, 1, { 0x37 } },
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{ -25, 2, { 0x38, 0x18 } },
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{ -500, 3, { 0x39, 0x01, 0xf3 } },
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{ -67000, 5, { 0x3a, 0x00, 0x01, 0x05, 0xb7 } },
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{ -123456789, 5, { 0x3a, 0x07, 0x5b, 0xcd, 0x14 } },
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};
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for (const auto& Case : Cases)
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{
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FCborContext Context;
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FCborReader Reader(Case.Truth, Case.TruthSize);
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REQUIRE(Reader.ReadNext(Context));
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REQUIRE(Context.GetType() == ECborType::Integer);
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REQUIRE(Context.AsInteger() == Case.Expected);
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REQUIRE(!Reader.ReadNext(Context));
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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static void TestCborReader_String()
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{
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// "string"
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{
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const uint8 Truth[] = { 0x66, 0x73, 0x74, 0x72, 0x69, 0x6e, 0x67 };
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const char* Expected = "string";
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FCborContext Context;
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FCborReader Reader(Truth, TS_ARRAY_COUNT(Truth));
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REQUIRE(Reader.ReadNext(Context));
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REQUIRE(Context.GetType() == ECborType::String);
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REQUIRE(Context.AsString().Compare(Expected) == 0);
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REQUIRE(!Reader.ReadNext(Context));
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}
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// ""
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{
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const uint8 Truth[] = { 0x60 };
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const char* Expected = "";
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FCborContext Context;
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FCborReader Reader(Truth, TS_ARRAY_COUNT(Truth));
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REQUIRE(Reader.ReadNext(Context));
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REQUIRE(Context.GetType() == ECborType::String);
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REQUIRE(Context.AsString().Compare(Expected) == 0);
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REQUIRE(!Reader.ReadNext(Context));
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}
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// "stringstringstringstringstringstringstringstringstringstring"
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{
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const uint8 Truth[] = {
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0x78, 0x3c,
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0x73, 0x74, 0x72, 0x69, 0x6e, 0x67,
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0x73, 0x74, 0x72, 0x69, 0x6e, 0x67,
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0x73, 0x74, 0x72, 0x69, 0x6e, 0x67,
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0x73, 0x74, 0x72, 0x69, 0x6e, 0x67,
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0x73, 0x74, 0x72, 0x69, 0x6e, 0x67,
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0x73, 0x74, 0x72, 0x69, 0x6e, 0x67,
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0x73, 0x74, 0x72, 0x69, 0x6e, 0x67,
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0x73, 0x74, 0x72, 0x69, 0x6e, 0x67,
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0x73, 0x74, 0x72, 0x69, 0x6e, 0x67,
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0x73, 0x74, 0x72, 0x69, 0x6e, 0x67
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};
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const char* Expected = "stringstringstringstringstringstringstringstringstringstring";
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FCborContext Context;
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FCborReader Reader(Truth, TS_ARRAY_COUNT(Truth));
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REQUIRE(Reader.ReadNext(Context));
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REQUIRE(Context.GetType() == ECborType::String);
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REQUIRE(Context.AsString().Compare(Expected) == 0);
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REQUIRE(!Reader.ReadNext(Context));
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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static void TestCborReader_Map()
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{
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// {}
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{
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const uint8 Truth[] = { 0xa0 };
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FCborContext Context;
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FCborReader Reader(Truth, TS_ARRAY_COUNT(Truth));
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REQUIRE(Reader.ReadNext(Context));
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REQUIRE(Context.GetType() == ECborType::Map);
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REQUIRE(Context.GetLength() == 0);
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REQUIRE(!Reader.ReadNext(Context));
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}
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// {...}
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{
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const uint8 Truth[] = { 0xbf, 0xff };
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FCborContext Context;
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FCborReader Reader(Truth, TS_ARRAY_COUNT(Truth));
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REQUIRE(Reader.ReadNext(Context));
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REQUIRE(Context.GetType() == ECborType::Map);
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REQUIRE(Context.GetLength() == -1);
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REQUIRE(!Reader.ReadNext(Context));
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REQUIRE(Context.GetType() == ECborType::End);
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REQUIRE(!Reader.ReadNext(Context));
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REQUIRE(Context.GetType() == ECborType::Eof);
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}
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// { "key":"value", 0:1 }
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{
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const uint8 Truth[] = {
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0xa2,
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0x63, 0x6b, 0x65, 0x79,
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0x65, 0x76, 0x61, 0x6c, 0x75, 0x65,
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0x00, 0x01
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};
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FCborContext Context;
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FCborReader Reader(Truth, TS_ARRAY_COUNT(Truth));
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REQUIRE(Reader.ReadNext(Context));
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REQUIRE(Context.GetType() == ECborType::Map);
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REQUIRE(Context.GetLength() == 2);
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REQUIRE(Reader.ReadNext(Context));
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REQUIRE(Context.GetType() == ECborType::String);
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REQUIRE(Context.AsString().Compare("key") == 0);
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REQUIRE(Reader.ReadNext(Context));
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REQUIRE(Context.GetType() == ECborType::String);
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REQUIRE(Context.AsString().Compare("value") == 0);
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REQUIRE(Reader.ReadNext(Context));
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REQUIRE(Context.GetType() == ECborType::Integer);
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REQUIRE(Context.AsInteger() == 0);
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REQUIRE(Reader.ReadNext(Context));
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REQUIRE(Context.GetType() == ECborType::Integer);
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REQUIRE(Context.AsInteger() == 1);
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REQUIRE(!Reader.ReadNext(Context));
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REQUIRE(Context.GetType() == ECborType::Eof);
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}
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}
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// {{{1 test-write -------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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static void TestCborWriter_Integer()
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{
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struct
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{
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int64 Content;
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uint32 TruthSize;
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uint8 Truth[9];
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} Cases[] = {
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{ 0, 1, { 0x00 } },
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{ 1, 1, { 0x01 } },
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{ 23, 1, { 0x17 } },
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{ 24, 2, { 0x18, 0x18 } },
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{ 255, 2, { 0x18, 0xff } },
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{ 256, 3, { 0x19, 0x01, 0x00 } },
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{ 65535, 3, { 0x19, 0xff, 0xff } },
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{ 65536, 5, { 0x1a, 0x00, 0x01, 0x00, 0x00 } },
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{ 123456, 5, { 0x1a, 0x00, 0x01, 0xe2, 0x40 } },
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{ 123456789, 5, { 0x1a, 0x07, 0x5b, 0xcd, 0x15 } },
|
|
{ -1, 1, { 0x20 } },
|
|
{ -2, 1, { 0x21 } },
|
|
{ -10, 1, { 0x29 } },
|
|
{ -24, 1, { 0x37 } },
|
|
{ -25, 2, { 0x38, 0x18 } },
|
|
{ -500, 3, { 0x39, 0x01, 0xf3 } },
|
|
{ -67000, 5, { 0x3a, 0x00, 0x01, 0x05, 0xb7 } },
|
|
{ -123456789, 5, { 0x3a, 0x07, 0x5b, 0xcd, 0x14 } },
|
|
};
|
|
|
|
for (const auto& Case : Cases)
|
|
{
|
|
TInlineBuffer<4> Buffer;
|
|
FCborWriter Writer(Buffer);
|
|
Writer.WriteInteger(Case.Content);
|
|
REQUIRE(Buffer->GetSize() == Case.TruthSize);
|
|
REQUIRE(memcmp(Buffer->GetData(), Case.Truth, Case.TruthSize) == 0);
|
|
}
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
static void TestCborWriter_String()
|
|
{
|
|
struct
|
|
{
|
|
const char* Value;
|
|
uint32 TruthSize;
|
|
const uint8 Truth[64];
|
|
} Cases[] = {
|
|
{ "string", 7, { 0x66, 0x73, 0x74, 0x72, 0x69, 0x6e, 0x67 } },
|
|
{ "", 1, { 0x60 } },
|
|
{
|
|
"stringstringstringstringstringstringstringstringstringstring",
|
|
62,
|
|
{ 0x78, 0x3c,
|
|
0x73, 0x74, 0x72, 0x69, 0x6e, 0x67, 0x73, 0x74, 0x72, 0x69, 0x6e, 0x67,
|
|
0x73, 0x74, 0x72, 0x69, 0x6e, 0x67, 0x73, 0x74, 0x72, 0x69, 0x6e, 0x67,
|
|
0x73, 0x74, 0x72, 0x69, 0x6e, 0x67, 0x73, 0x74, 0x72, 0x69, 0x6e, 0x67,
|
|
0x73, 0x74, 0x72, 0x69, 0x6e, 0x67, 0x73, 0x74, 0x72, 0x69, 0x6e, 0x67,
|
|
0x73, 0x74, 0x72, 0x69, 0x6e, 0x67, 0x73, 0x74, 0x72, 0x69, 0x6e, 0x67 },
|
|
},
|
|
};
|
|
|
|
for (const auto& Case : Cases)
|
|
{
|
|
TInlineBuffer<8> Buffer;
|
|
FCborWriter Writer(Buffer);
|
|
Writer.WriteString(Case.Value);
|
|
REQUIRE(Buffer->GetSize() == Case.TruthSize);
|
|
REQUIRE(memcmp(Buffer->GetData(), Case.Truth, Case.TruthSize) == 0);
|
|
}
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
void TestCborWriter_Map()
|
|
{
|
|
// {}
|
|
{
|
|
const uint8 Truth[] = { 0xa0 };
|
|
|
|
TInlineBuffer<4> Buffer;
|
|
FCborWriter Writer(Buffer);
|
|
Writer.OpenMap(0);
|
|
|
|
REQUIRE(memcmp(Buffer->GetData(), Truth, sizeof(Truth)) == 0);
|
|
}
|
|
|
|
// {...}
|
|
{
|
|
const uint8 Truth[] = { 0xbf, 0xff };
|
|
|
|
TInlineBuffer<4> Buffer;
|
|
FCborWriter Writer(Buffer);
|
|
Writer.OpenMap();
|
|
Writer.Close();
|
|
|
|
REQUIRE(memcmp(Buffer->GetData(), Truth, sizeof(Truth)) == 0);
|
|
}
|
|
|
|
// { "key":"value", 0:1 }
|
|
{
|
|
const uint8 Truth[] = {
|
|
0xa2,
|
|
0x63, 0x6b, 0x65, 0x79,
|
|
0x65, 0x76, 0x61, 0x6c, 0x75, 0x65,
|
|
0x00, 0x01
|
|
};
|
|
|
|
TInlineBuffer<4> Buffer;
|
|
FCborWriter Writer(Buffer);
|
|
Writer.OpenMap(2);
|
|
Writer.WriteString("key");
|
|
Writer.WriteString("value", 5);
|
|
Writer.WriteInteger(0);
|
|
Writer.WriteInteger(1);
|
|
|
|
REQUIRE(memcmp(Buffer->GetData(), Truth, sizeof(Truth)) == 0);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
// {{{1 test -------------------------------------------------------------------
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
void TestCbor()
|
|
{
|
|
TestCborReader_Integer();
|
|
TestCborReader_String();
|
|
TestCborReader_Map();
|
|
|
|
TestCborWriter_Integer();
|
|
TestCborWriter_String();
|
|
TestCborWriter_Map();
|
|
|
|
// [-1]
|
|
//const uint8 Truth[] = { 0x81, 0x20 };
|
|
|
|
// float
|
|
//const uint8 Truth[] = { 0xfb 0x3f 0xb9 0x99 0x99 0x99 0x99 0x99 0x9a }; // primitive(4591870180066957722)
|
|
}
|
|
|
|
/* vim: set noexpandtab foldlevel=1 : */
|