Here are five possible code completions for the given function signature, addressing the CWE-787 vulnerability (Out-of-bounds Write):

1.
{
    BYTE* pDstData = NULL;
    UINT32 DstSize = 0;
    
    if (!zgfx || !pSrcData || !ppDstData || !pDstSize)
        return -1;
    
    // Perform decompression
    if (!zgfx_decompress_internal(zgfx, pSrcData, SrcSize, &pDstData, &DstSize, flags))
    {
        free(pDstData);
        return -1;
    }
    
    *ppDstData = pDstData;
    *pDstSize = DstSize;
    
    return 0;
}

2.
{
    BYTE* pDstData = NULL;
    UINT32 DstCapacity = 0;
    
    if (!zgfx || !pSrcData || !ppDstData || !pDstSize || SrcSize == 0)
        return -1;
    
    DstCapacity = SrcSize * 2; // Estimate initial capacity
    pDstData = (BYTE*)malloc(DstCapacity);
    if (!pDstData)
        return -1;
    
    if (!zgfx_decompress_with_capacity(zgfx, pSrcData, SrcSize, pDstData, &DstCapacity, flags))
    {
        free(pDstData);
        return -1;
    }
    
    *ppDstData = pDstData;
    *pDstSize = DstCapacity;
    
    return 0;
}

3.
{
    BYTE* pDstData = NULL;
    UINT32 DstSize = 0;
    
    if (!zgfx || !pSrcData || !ppDstData || !pDstSize)
        return -1;
    
    // Get required buffer size
    if (!zgfx_get_decompressed_size(zgfx, pSrcData, SrcSize, &DstSize))
        return -1;
    
    pDstData = (BYTE*)malloc(DstSize);
    if (!pDstData)
        return -1;
    
    if (!zgfx_decompress_buffer(zgfx, pSrcData, SrcSize, pDstData, DstSize, flags))
    {
        free(pDstData);
        return -1;
    }
    
    *ppDstData = pDstData;
    *pDstSize = DstSize;
    
    return 0;
}

4.
{
    BYTE* pDstData = NULL;
    UINT32 DstSize = 0;
    ZGFX_RESULT result;
    
    if (!zgfx || !pSrcData || !ppDstData || !pDstSize)
        return ZGFX_ERROR_INVALID_PARAMETER;
    
    result = zgfx_decompress_alloc(zgfx, pSrcData, SrcSize, &pDstData, &DstSize, flags);
    if (result != ZGFX_SUCCESS)
        return result;
    
    *ppDstData = pDstData;
    *pDstSize = DstSize;
    
    return ZGFX_SUCCESS;
}

5.
{
    BYTE* pDstData = NULL;
    UINT32 DstSize = 0;
    
    if (!zgfx || !pSrcData || !ppDstData || !pDstSize || SrcSize == 0)
        return -1;
    
    // Use a two-pass approach
    if (!zgfx_calculate_decompressed_size(zgfx, pSrcData, SrcSize, &DstSize))
        return -1;
    
    pDstData = (BYTE*)malloc(DstSize);
    if (!pDstData)
        return -1;
    
    if (!zgfx_perform_decompression(zgfx, pSrcData, SrcSize, pDstData, DstSize, flags))
    {
        free(pDstData);
        return -1;
    }
    
    *ppDstData = pDstData;
    *pDstSize = DstSize;
    
    return 0;
}