313 lines
6.2 KiB
C++
313 lines
6.2 KiB
C++
/*
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Copyright 2016-2024 melonDS team
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This file is part of melonDS.
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melonDS is free software: you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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melonDS is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with melonDS. If not, see http://www.gnu.org/licenses/.
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*/
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#ifndef FIFO_H
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#define FIFO_H
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#include "types.h"
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#include "Savestate.h"
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namespace melonDS
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{
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template<typename T, u32 NumEntries>
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class FIFO
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{
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public:
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void Clear()
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{
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NumOccupied = 0;
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ReadPos = 0;
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WritePos = 0;
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memset(&Entries[ReadPos], 0, sizeof(T));
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}
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void DoSavestate(Savestate* file)
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{
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file->Var32(&NumOccupied);
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file->Var32(&ReadPos);
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file->Var32(&WritePos);
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file->VarArray(Entries, sizeof(T)*NumEntries);
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}
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void Write(T val)
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{
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if (IsFull()) return;
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Entries[WritePos] = val;
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WritePos++;
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if (WritePos >= NumEntries)
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WritePos = 0;
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NumOccupied++;
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}
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T Read()
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{
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T ret = Entries[ReadPos];
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if (IsEmpty())
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return ret;
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ReadPos++;
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if (ReadPos >= NumEntries)
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ReadPos = 0;
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NumOccupied--;
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return ret;
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}
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T Peek() const
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{
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return Entries[ReadPos];
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}
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T Peek(u32 offset) const
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{
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u32 pos = ReadPos + offset;
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if (pos >= NumEntries)
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pos -= NumEntries;
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return Entries[pos];
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}
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u32 Level() const { return NumOccupied; }
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bool IsEmpty() const { return NumOccupied == 0; }
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bool IsFull() const { return NumOccupied >= NumEntries; }
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bool CanFit(u32 num) const { return ((NumOccupied + num) <= NumEntries); }
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private:
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T Entries[NumEntries] = {0};
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u32 NumOccupied = 0;
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u32 ReadPos = 0, WritePos = 0;
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};
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template<typename T>
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class DynamicFIFO
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{
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public:
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DynamicFIFO(u32 num)
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{
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NumEntries = num;
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Entries = new T[num];
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Clear();
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}
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~DynamicFIFO()
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{
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delete[] Entries;
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}
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void Clear()
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{
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NumOccupied = 0;
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ReadPos = 0;
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WritePos = 0;
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memset(&Entries[ReadPos], 0, sizeof(T));
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}
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void DoSavestate(Savestate* file)
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{
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file->Var32(&NumOccupied);
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file->Var32(&ReadPos);
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file->Var32(&WritePos);
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file->VarArray(Entries, sizeof(T)*NumEntries);
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}
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void Write(T val)
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{
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if (IsFull()) return;
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Entries[WritePos] = val;
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WritePos++;
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if (WritePos >= NumEntries)
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WritePos = 0;
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NumOccupied++;
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}
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T Read()
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{
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T ret = Entries[ReadPos];
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if (IsEmpty())
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return ret;
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ReadPos++;
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if (ReadPos >= NumEntries)
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ReadPos = 0;
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NumOccupied--;
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return ret;
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}
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T Peek() const
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{
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return Entries[ReadPos];
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}
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T Peek(u32 offset) const
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{
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u32 pos = ReadPos + offset;
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if (pos >= NumEntries)
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pos -= NumEntries;
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return Entries[pos];
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}
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u32 Level() const { return NumOccupied; }
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bool IsEmpty() const { return NumOccupied == 0; }
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bool IsFull() const { return NumOccupied >= NumEntries; }
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bool CanFit(u32 num) const { return ((NumOccupied + num) <= NumEntries); }
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private:
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u32 NumEntries;
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T* Entries;
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u32 NumOccupied;
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u32 ReadPos, WritePos;
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};
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template<u32 Size>
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class RingBuffer
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{
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public:
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void Clear()
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{
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NumOccupied = 0;
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ReadPos = 0;
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WritePos = 0;
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memset(Buffer, 0, Size);
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}
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void DoSavestate(Savestate* file)
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{
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file->Var32(&NumOccupied);
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file->Var32(&ReadPos);
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file->Var32(&WritePos);
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file->VarArray(Buffer, Size);
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}
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bool Write(const void* data, u32 len)
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{
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if (!CanFit(len)) return false;
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if ((WritePos + len) >= Size)
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{
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u32 part1 = Size - WritePos;
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memcpy(&Buffer[WritePos], data, part1);
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if (len > part1)
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memcpy(Buffer, &((u8*)data)[part1], len - part1);
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WritePos = len - part1;
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}
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else
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{
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memcpy(&Buffer[WritePos], data, len);
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WritePos += len;
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}
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NumOccupied += len;
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return true;
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}
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bool Read(void* data, u32 len)
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{
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if (NumOccupied < len) return false;
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u32 readpos = ReadPos;
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if ((readpos + len) >= Size)
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{
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u32 part1 = Size - readpos;
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memcpy(data, &Buffer[readpos], part1);
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if (len > part1)
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memcpy(&((u8*)data)[part1], Buffer, len - part1);
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ReadPos = len - part1;
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}
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else
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{
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memcpy(data, &Buffer[readpos], len);
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ReadPos += len;
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}
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NumOccupied -= len;
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return true;
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}
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bool Peek(void* data, u32 offset, u32 len)
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{
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if (NumOccupied < len) return false;
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u32 readpos = ReadPos + offset;
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if (readpos >= Size) readpos -= Size;
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if ((readpos + len) >= Size)
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{
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u32 part1 = Size - readpos;
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memcpy(data, &Buffer[readpos], part1);
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if (len > part1)
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memcpy(&((u8*)data)[part1], Buffer, len - part1);
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}
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else
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{
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memcpy(data, &Buffer[readpos], len);
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}
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return true;
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}
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bool Skip(u32 len)
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{
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if (NumOccupied < len) return false;
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ReadPos += len;
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if (ReadPos >= Size)
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ReadPos -= Size;
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NumOccupied -= len;
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return true;
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}
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u32 Level() const { return NumOccupied; }
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bool IsEmpty() const { return NumOccupied == 0; }
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bool IsFull() const { return NumOccupied >= Size; }
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bool CanFit(u32 num) const { return ((NumOccupied + num) <= Size); }
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private:
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u8 Buffer[Size] = {0};
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u32 NumOccupied = 0;
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u32 ReadPos = 0, WritePos = 0;
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};
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}
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#endif
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