233 lines
9.2 KiB
C++
233 lines
9.2 KiB
C++
/***
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Copyright (C) 2021 J Reece Wilson (a/k/a "Reece"). All rights reserved.
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File: ByteBuffer.hpp
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Date: 2021-8-5
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Author: Reece
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***/
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#pragma once
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namespace Aurora::Memory
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{
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static const auto kBufferPageSize = 512;
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//static const auto kBufferBasePower = 8;
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static const auto kBufferInitialPower = 9;// -kBufferBasePower; // 4-bit integer
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/***
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* A bytebuffer object represents a linear, partially-linear resizable, buffer **or** a ring buffer.
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*
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* Use cases for a ring buffer include wrapping streams for a use case in which the consumer may
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* expect arbitrary stream seeks of an otherwise limited consume-once stream
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*
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* IE;
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* -> Peeking a header in a datagram, or tcp stream; where instead of freeing the datagram or double
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* buffering the network stack when required, a ring buffer is used to prevent reallocation on each frame
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* -> Peeking, or seeking back after, compression read. A compression api could be fed on-Sdemand or ad hoc,
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* writing to its write head pointer, while never running out of space so long as the decompressed ring
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* read head continues moving
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*
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* Small, linear, write/read-once [de]serialization use cases may elect to allocate a buffer and
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* follow the linear fast paths; perhaps even enabling flagExpandable for hopefully-smarter-than-stdvec-scaling
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*
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* Ring buffers scale from the write head, to the read head, potentially going-around in the process
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*
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* Linear flagExpandable buffers scale from [0, length]; reallocating at end of buffer if flagExpandable is enabled
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* if expanding is enabled,
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* realloc(max(size + offset, (offset / kBufferPageSize + 1) * kBufferPageSize))
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*
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* Deprecates INetworkStream, fixes allocation issues around compression backends
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* Superseeds abuse of AuList<AuUInt8> for binary blobs, alongside Memory::Array
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*/
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struct ByteBuffer
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{
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///////////////////////////////////////////////////////////////////////
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// Stable ByteBuffer ABI Header; length and read/write head pointers //
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///////////////////////////////////////////////////////////////////////
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/// Internal capacity to mitigate trivial reallocs
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AuUInt allocSize;
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/// Abstract size
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AuUInt length;
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/// Buffer pointer
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AuUInt8 *base;
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/// Stream pointer
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AuUInt8 *readPtr;
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/// Stream pointer
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AuUInt8 *writePtr;
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///////////////////////////////////////////////////////////////////////
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// Stable ByteBuffer ABI Header; u32 flags //
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///////////////////////////////////////////////////////////////////////
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/// Is ring buffer?
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AuUInt8 flagCircular : 1;
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/// Should resize linear buffer to accommodate additional writes
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AuUInt8 flagExpandable : 1;
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AuUInt8 flagReadError : 1;
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AuUInt8 flagWriteError : 1;
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// - implicit padding
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AuUInt8 scaleSize;// : 4; screw it.... we should just take 6 * (4/8) up to 32/64, we wont go up a slab allocation bucket, whatever you want to call it
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///////////////////////////////////////////////////////////////////////
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ByteBuffer(ByteBuffer &&buffer)
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{
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this->base = buffer.base;
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this->length = buffer.length;
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this->allocSize = buffer.length;
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this->writePtr = this->base + (buffer.writePtr - buffer.base);
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this->readPtr = this->base + (buffer.readPtr - buffer.base);
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this->flagCircular = buffer.flagCircular;
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this->flagExpandable = buffer.flagExpandable;
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this->scaleSize = buffer.scaleSize;
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buffer.base = {};
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buffer.length = {};
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buffer.allocSize = {};
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buffer.writePtr = {};
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buffer.readPtr = {};
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buffer.flagCircular = {};
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buffer.flagExpandable = {};
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buffer.scaleSize = {};
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}
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ByteBuffer(const ByteBuffer &buffer, bool preservePointers = true)
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{
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this->base = FAlloc<AuUInt8 *>(buffer.length);
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if (!this->base) AU_THROW_STRING("memory error");
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this->length = buffer.length;
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this->allocSize = buffer.length;
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if (preservePointers)
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{
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this->writePtr = this->base + (buffer.writePtr - buffer.base);
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this->readPtr = this->base + (buffer.readPtr - buffer.base);
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}
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else
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{
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this->writePtr = this->base;
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this->readPtr = this->base;
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}
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AuMemcpy(this->base, buffer.base, this->length);
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this->flagCircular = buffer.flagCircular;
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this->flagExpandable = buffer.flagExpandable;
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this->scaleSize = buffer.scaleSize;
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}
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ByteBuffer(const void *in, AuUInt length, bool circular = false, bool expandable = false) : flagCircular(circular), flagExpandable(expandable), flagReadError(0), flagWriteError(0)
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{
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this->base = FAlloc<AuUInt8 *>(length);
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if (!this->base) AU_THROW_STRING("memory error");
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this->length = length;
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this->allocSize = length;
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this->readPtr = this->base;
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this->writePtr = this->readPtr + this->length;
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AuMemcpy(this->base, in, this->length);
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this->scaleSize = kBufferInitialPower;
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}
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ByteBuffer(const AuList<AuUInt8> &vector, bool circular = false, bool expandable = false) : flagCircular(circular), flagExpandable(expandable), flagReadError(0), flagWriteError(0)
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{
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this->base = FAlloc<AuUInt8 *>(vector.size());
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if (!this->base) AU_THROW_STRING("memory error");
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this->length = vector.size();
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this->allocSize = vector.size();
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this->readPtr = this->base;
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this->writePtr = this->readPtr + this->length;
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AuMemcpy(this->base, vector.data(), this->length);
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this->scaleSize = kBufferInitialPower;
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}
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ByteBuffer(AuUInt length, bool circular = false, bool expandable = false) : flagCircular(circular), flagExpandable(expandable), flagReadError(0), flagWriteError(0)
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{
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this->base = ZAlloc<AuUInt8 *>(length);
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if (!this->base) AU_THROW_STRING("memory error");
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this->length = length;
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this->allocSize = length;
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this->readPtr = this->base;
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this->writePtr = this->base;
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this->scaleSize = kBufferInitialPower;
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}
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ByteBuffer() : flagCircular(0), flagExpandable(0), flagReadError(0), flagWriteError(0)
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{
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this->base = {};
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this->length = {};
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this->allocSize = {};
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this->readPtr = {};
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this->writePtr = {};
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this->scaleSize = kBufferInitialPower;
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}
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~ByteBuffer()
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{
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if (this->base)
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{
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Free(this->base);
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}
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}
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inline void ResetPositions()
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{
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this->flagReadError = 0;
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this->flagWriteError = 0;
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this->readPtr = base;
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this->writePtr = base;
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}
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// Iterator
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inline auline AuUInt8 * begin() const;
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inline auline AuUInt8 * end() const;
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// Utils To alternative types
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inline auline AuList<AuUInt8> ToVector() const;
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inline AuUInt32 GetAllocationPower() const;
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inline operator AuList<AuUInt8>() const;
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inline operator MemoryViewRead() const;
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inline AuList<AuUInt8> RemainingBytesToVector(bool endAtWrite = true) const;
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// Seek / Position
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inline auline bool ReaderTryGoForward(AuUInt32 offset);
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inline auline bool ReaderTryGoBack(AuUInt32 offset);
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inline auline bool WriterTryGoForward(AuUInt32 offset);
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inline auline AuUInt RemainingWrite(bool endAtRead = true);
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inline auline AuUInt RemainingBytes(bool endAtWrite = true);
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inline auline bool Skip(AuUInt count);
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inline auline AuUInt GetReadOffset() const;
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inline auline AuUInt GetWriteOffset() const;
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inline AuOptional<AuUInt8 *> WriterTryGetWriteHeadFor(AuUInt32 nBytes);
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// Memory operations
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inline auline bool Allocate(AuUInt length, bool fast = true);
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inline auline bool SetBuffer(const void *in, AuUInt length);
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inline auline bool SetBuffer(const AuList<AuUInt8> &buffer);
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inline auline void GC();
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inline auline bool Resize(AuUInt length);
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// Basic Read Write
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inline auline AuUInt Write(const void *buffer, AuUInt requestLength);
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inline auline AuUInt Read(void *out, AuUInt requestedLength, bool peek = false);
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// Typed read/write
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template<typename T>
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T Read();
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template<typename T>
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bool Write(const T &in);
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template<typename T>
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bool Read(T &out);
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};
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} |