AuroraRuntime/Source/Compression/AuBaseStream.cpp

/***
    Copyright (C) 2022 J Reece Wilson (a/k/a "Reece"). All rights reserved.

    File: AuBaseStream.cpp
    Date: 2022-2-14
    Author: Reece
***/
#include <Source/RuntimeInternal.hpp>
#include "AuCompression.hpp"
#include "AuIngestableReadBase.hpp"
#include "AuBaseStream.hpp"

namespace Aurora::Compression
{
    AuStreamReadWrittenPair_t BaseStream::ReadEx(const AuMemoryViewWrite &/*optional/nullable*/destination,
                                                 bool bIngestUntilEOS)
    {
        AU_LOCK_GUARD(this->_spinlock);

        AuUInt32 dwRead {}, dwBytesWritten {};

        if (!destination.length && !destination.ptr)
        {
            return {0, this->pOutputBuffer_->RemainingBytes()};
        }

        if (bIngestUntilEOS)
        {
            while (this->pOutputBuffer_->RemainingBytes() < destination.length)
            {
                auto toRead = destination.length ? AuUInt32(destination.length - this->pOutputBuffer_->RemainingBytes()) : 10 * 1024;

                // TODO: I was trying to get out of stream memory to explode less with real code. bIngestUntilEOS users are usually lazy decompressors
                // This was just to give a chance to yield, because theres no API to process after end of write condition; we always ended up failing.
                // ...
                // I think this rate limiter can be removed. Something else was the primary factor.
                toRead = AuMin<AuUInt32>(toRead, 1024 * 10);

                auto realPair = Ingest_s(toRead);
                dwRead += realPair.first;

                if (realPair.second == 0)
                {
                    //if (!this->pOutputBuffer_->RemainingBytes(true))
                    //{
                    //    return {};
                    //}

                    break;
                }
            }
        }

        dwBytesWritten = this->pOutputBuffer_->Read(destination.ptr, destination.length, destination.ptr == nullptr);
        return {dwRead, dwBytesWritten};
    }

    AuUInt32 BaseStream::GetAvailableProcessedBytes()
    {
        AU_LOCK_GUARD(this->_spinlock);
        return this->pOutputBuffer_->RemainingBytes(true);
    }

    AuUInt32 BaseStream::Read(const AuMemoryViewWrite & /*opt*/ destination)
    {
        AU_LOCK_GUARD(this->_spinlock);
        if (!destination.length && !destination.ptr)
        {
            return this->pOutputBuffer_->RemainingBytes();
        }

        return this->pOutputBuffer_->Read(destination.ptr, destination.length, destination.ptr == nullptr);
    }

    bool BaseStream::GoBackByProcessedN(AuUInt32 dwOffset)
    {
        AU_LOCK_GUARD(this->_spinlock);
        return this->pOutputBuffer_->ReaderTryGoBack(dwOffset);
    }

    bool BaseStream::GoForwardByProcessedN(AuUInt32 dwOffset)
    {
        AU_LOCK_GUARD(this->_spinlock);
        if (!dwOffset)
        {
            return true;
        }
        return this->pOutputBuffer_->ReaderTryGoForward(dwOffset);
    }

    AuStreamReadWrittenPair_t BaseStream::Ingest(AuUInt32 dwBytesFromUnprocessedInputSource)
    {
        AU_LOCK_GUARD(this->_spinlock);

        if (!dwBytesFromUnprocessedInputSource)
        {
            return {};
        }

        return Ingest_s(dwBytesFromUnprocessedInputSource);
    }

    bool BaseStream::IsValid()
    {
        return this->uBufferSize_ ? (this->pOutputBuffer_ && this->pOutputBuffer_->IsValid()) : true;
    }

    AuSPtr<Memory::ByteBuffer> BaseStream::GetBuffer()
    {
        return this->pOutputBuffer_;
    }

    void BaseStream::SetBuffer(const AuSPtr<Memory::ByteBuffer> &pBuffer)
    {
        if (!pBuffer)
        {
            this->pOutputBuffer_ = AuUnsafeRaiiToShared(&this->_outbufferOwned);
        }
        else
        {
            this->pOutputBuffer_ = pBuffer;
        }
    }

    bool BaseStream::Write(const void *pDest, AuUInt32 dwLength)
    {
        return this->pOutputBuffer_->Write(AuReinterpretCast<const AuUInt8 *>(pDest), dwLength) == dwLength;
    }

    AuUInt32 BaseStream::GetInternalBufferSize()
    {
        return this->pOutputBuffer_->allocSize;
    }

    bool BaseStream::Flush()
    {
        return false;
    }

    bool BaseStream::Finish()
    {
        return false;
    }
}