lliobuffer.cpp

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#include "linden_common.h"
#include "lliobuffer.h"

//
// LLIOBuffer
//
LLIOBuffer::LLIOBuffer() :
        mBuffer(NULL),
        mBufferSize(0L),
        mReadHead(NULL),
        mWriteHead(NULL)
{
}

LLIOBuffer::~LLIOBuffer()
{
        if(mBuffer)
        {
                delete[] mBuffer;
        }
}

U8* LLIOBuffer::data() const
{
        return mBuffer;
}

S64 LLIOBuffer::size() const
{
        return mBufferSize;
}

U8* LLIOBuffer::current() const
{
        return mReadHead;
}

S64 LLIOBuffer::bytesLeft() const
{
        return mWriteHead - mReadHead;
}

void LLIOBuffer::clear()
{
        mReadHead = mBuffer;
        mWriteHead = mBuffer;
}

LLIOPipe::EStatus LLIOBuffer::seek(LLIOBuffer::EHead head, S64 delta)
{
        LLIOPipe::EStatus status = STATUS_ERROR;
        switch(head)
        {
        case READ:
                if(((delta >= 0) && ((mReadHead + delta) <= mWriteHead))
                   || (delta < 0) && ((mReadHead + delta) >= mBuffer))
                {
                        mReadHead += delta;
                        status = STATUS_OK;
                }
                break;
        case WRITE:
                if(((delta >= 0) && ((mWriteHead + delta) < (mBuffer + mBufferSize)))
                   || (delta < 0) && ((mWriteHead + delta) > mReadHead))
                {
                        mWriteHead += delta;
                        status = STATUS_OK;
                }
        default:
                break;
        }
        return status;
}

// virtual
LLIOPipe::EStatus LLIOBuffer::process_impl(
        const LLChannelDescriptors& channels,
        buffer_ptr_t& buffer,
        bool& eos,
        LLSD& context,
        LLPumpIO* pump)
{
        // no-op (I think)
        llwarns << "You are using an LLIOBuffer which is deprecated." << llendl;
        return STATUS_OK;
}

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