MtkDataBufferAllocate.c

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/*===========================================================================
=                                                                           =
=                          MtkDataBufferAllocate                            =
=                                                                           =
=============================================================================

                         Jet Propulsion Laboratory
                                   MISR
                               MISR Toolkit

            Copyright 2005, California Institute of Technology.
                           ALL RIGHTS RESERVED.
                 U.S. Government Sponsorship acknowledged.

============================================================================*/

#include "MisrUtil.h"
#include <stdlib.h>

MTKt_status MtkDataBufferAllocate(
  int nline,   
  int nsample, 
  MTKt_DataType datatype, 
  MTKt_DataBuffer *databuf  )
{
  MTKt_status status_code;      /* Return status of this function */
  MTKt_DataBuffer dbuf = MTKT_DATABUFFER_INIT;
                /* Data buffer structure */
  int datasize[] = MTKd_DataSize; /* Data size by data type */
  int i;            /* Index */
  
  if (databuf == NULL)
    MTK_ERR_CODE_JUMP(MTK_NULLPTR);

  if (nline < 0)
    MTK_ERR_CODE_JUMP(MTK_OUTBOUNDS);

  if (nsample < 0)
    MTK_ERR_CODE_JUMP(MTK_OUTBOUNDS);

  dbuf.nline = nline;
  dbuf.nsample = nsample;
  dbuf.datasize = datasize[datatype];
  dbuf.datatype = datatype;
  dbuf.imported = MTK_FALSE;    /* Data pointer is allocated by Mtk */

  /* Allocate 1D Illiffe vector */
  dbuf.vdata = (void **)calloc(dbuf.nline, sizeof(void *));
  if (dbuf.vdata == NULL)
    MTK_ERR_CODE_JUMP(MTK_CALLOC_FAILED);

  /* Allocate 2D buffer */
  dbuf.vdata[0] = (void *)calloc(dbuf.nline * dbuf.nsample, dbuf.datasize);
  if (dbuf.vdata[0] == NULL)
    MTK_ERR_CODE_JUMP(MTK_CALLOC_FAILED);

  /* Connect Illiffe vector */
  for (i = 1; i < nline; i++) {
    dbuf.vdata[i] = (void *)((unsigned char *)(dbuf.vdata[i-1]) +
                 dbuf.nsample * dbuf.datasize);
  }

  /* Hook the union to the void data pointer */
  dbuf.data.v = dbuf.vdata;
  /* Hook the data pointer to the data */
  dbuf.dataptr = dbuf.vdata[0];

  *databuf = dbuf;

  return MTK_SUCCESS;

ERROR_HANDLE:
  return status_code;
}