CWE-ou-minkata/Sources/Plasma/CoreLib/hsSTLStream.cpp

/*==LICENSE==*

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*==LICENSE==*/
#include "hsSTLStream.h"

hsVectorStream::hsVectorStream() : fEnd(0)
{
}

hsVectorStream::hsVectorStream(uint32_t chunkSize)
{   
    fVector.reserve(chunkSize);
}

hsVectorStream::~hsVectorStream()
{
}

bool hsVectorStream::AtEnd()
{
    return (fBytesRead >= fEnd);
}

uint32_t hsVectorStream::Read(uint32_t byteCount, void *buffer)
{
    if (fBytesRead + byteCount > fEnd)
    {
//      hsStatusMessageF("Reading past end of hsVectorStream (read %u of %u requested bytes)", fEnd-fBytesRead, byteCount);
        byteCount = fEnd - fBytesRead;
    }
    
    memcpy(buffer, &fVector[fBytesRead], byteCount);

    fBytesRead += byteCount;
    fPosition += byteCount;

    return byteCount;
}

uint32_t hsVectorStream::Write(uint32_t byteCount, const void* buffer)
{
    // If we are at the end of the vector, we can just do a block insert of the data
    if (fPosition == fVector.size())
        fVector.insert(fVector.end(), (uint8_t*)buffer, (uint8_t*)buffer+byteCount);
    // If we are in the middle, I don't know how to just overwrite a block of the vector.
    // So, we make sure there is enough space and copy the elements one by one
    else
    {
        fVector.reserve(fPosition+byteCount);
        for (uint32_t i = 0; i < byteCount; i++)
            fVector[fPosition+i] = ((uint8_t*)buffer)[i];
    }

    fPosition += byteCount;

    if (fPosition > fEnd)
        fEnd = fPosition;

    return byteCount;
}

void hsVectorStream::Skip(uint32_t deltaByteCount)
{
    fBytesRead += deltaByteCount;
    fPosition += deltaByteCount;
}

void hsVectorStream::Rewind()
{
    fBytesRead = 0;
    fPosition = 0;
}

void hsVectorStream::FastFwd()
{
    fBytesRead = fPosition = fEnd;
}

void hsVectorStream::Truncate()
{
    fVector.erase(fVector.begin()+fPosition, fVector.end());
    fEnd = fPosition-1;
}

uint32_t hsVectorStream::GetEOF()
{
    return fEnd;
}

void hsVectorStream::CopyToMem(void* mem)
{
    memcpy(mem, &fVector[0], fEnd);
}

void hsVectorStream::Erase(uint32_t bytes)
{
    hsAssert(fPosition+bytes <= fEnd, "Erasing past end of stream");

    fVector.erase(fVector.begin()+fPosition, fVector.begin()+fPosition+bytes);
    fEnd -= bytes;
}

void hsVectorStream::Reset()
{
    fBytesRead = 0;
    fPosition = 0;
    fEnd = 0;
    fVector.clear();
}

const void *hsVectorStream::GetData()
{
    if (fVector.size() > 0)
        return &fVector[0];
    else
        return nil;
}