Allocating Memory for Compression

The ioAssociateCodec routine shown in the following example calls the ioInitCodecopen routine to allocate memory. The next example illustrates how the ioInitCodecopen routine allocates memory and initializes a CODECOPEN structure to be saved in the CODEC control block (CCB).

LONG ioInitCodecopen ( PCCB pccb,
                       PCODECOPEN pcodecopen)

{
   ULONG             ulSize;


   ENTERCRITX;
   pccb->codecopen.ulFlags = pcodecopen->ulFlags;

   /* Create and copy Pointers to structures in CODECOPEN structure */
   if (pcodecopen->pControlHdr) {
     ulSize = *((PULONG)pcodecopen->pControlHdr);
     if (!(pccb->codecopen.pControlHdr = (PVOID)HhpAllocMem(hheap,ulSize)))
        {
         return(MMIO_ERROR);
         }
      memcpy(pccb->codecopen.pControlHdr, pcodecopen->pControlHdr, ulSize);
      }

   if (pcodecopen->pSrcHdr) {
      ulSize = *((PULONG)pcodecopen->pSrcHdr);
      if (!(pccb->codecopen.pSrcHdr = (PVOID)HhpAllocMem(hheap,ulSize)))
         {
         return(MMIO_ERROR);
         }
      memcpy(pccb->codecopen.pSrcHdr, pcodecopen->pSrcHdr, ulSize);
      }

   if (pcodecopen->pDstHdr) {
      ulSize = *((PULONG)pcodecopen->pDstHdr);
      if (!(pccb->codecopen.pDstHdr = (PVOID)HhpAllocMem(hheap,ulSize)))
         {
         return(MMIO_ERROR);
         }
      memcpy(pccb->codecopen.pDstHdr, pcodecopen->pDstHdr, ulSize);
      }

   if (pcodecopen->pOtherInfo) {
      ulSize = *((PULONG)pcodecopen->pOtherInfo);
      if (!(pccb->codecopen.pOtherInfo = (PVOID)HhpAllocMem(hheap,ulSize)))
      {
         return(MMIO_ERROR);
         }
      memcpy(pccb->codecopen.pOtherInfo, pcodecopen->pOtherInfo, ulSize);
      }

   EXITCRIT;
   return(MMIO_SUCCESS);
}