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/*
* mcu.c --
*
* Support for MCU allocation, deallocation, and printing.
*
* Copyright (c) 1993 Brian C. Smith, The Regents of the University
* of California
* All rights reserved.
*
* Copyright (c) 1994 Kongji Huang and Brian C. Smith.
* Cornell University
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose, without fee, and without written agreement is
* hereby granted, provided that the above copyright notice and the following
* two paragraphs appear in all copies of this software.
*
* IN NO EVENT SHALL CORNELL UNIVERSITY BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF CORNELL
* UNIVERSITY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* CORNELL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND CORNELL UNIVERSITY HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
#include <string.h>
#include "jpeg.h"
#include "mcu.h"
#include "proto.h"
MCU *mcuTable; /* the global mcu table that buffers the source image */
MCU *mcuROW1, *mcuROW2; /* point to two rows of MCU in encoding & decoding */
int numMCU; /* number of MCUs in mcuTable */
/*
*--------------------------------------------------------------
*
* MakeMCU, InitMcuTable --
*
* InitMcuTable does a big malloc to get the amount of memory
* we'll need for storing MCU's, once we know the size of our
* input and output images.
* MakeMCU returns an MCU for input parsing.
*
* Results:
* A new MCU
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
void
InitMcuTable(lnumMCU,compsInScan)
int lnumMCU;
int compsInScan;
{
int i, mcuSize;
char *buffer;
/*
* Compute size of on MCU (in bytes). Round up so it's on a
* boundary for any alignment. In this code, we assume this
* is a whole multiple of sizeof(double).
*/
mcuSize = compsInScan * sizeof(ComponentType);
mcuSize = JroundUp(mcuSize,sizeof(double));
/*
* Allocate the MCU table, and a buffer which will contain all
* the data. Then carve up the buffer by hand. Note that
* mcuTable[0] points to the buffer, in case we want to free
* it up later.
*/
mcuTable = (MCU *)malloc(lnumMCU * sizeof(MCU));
if (mcuTable==NULL)
fprintf(stderr,"Not enough memory for mcuTable\n");
buffer = (char *)malloc(lnumMCU * mcuSize);
if (buffer==NULL)
fprintf(stderr,"Not enough memory for buffer\n");
for (i=0; i<lnumMCU; i++) {
mcuTable[i] = (MCU)(buffer + i*mcuSize);
}
}
#define MakeMCU(dcPtr) (mcuTable[numMCU++])
/*
*--------------------------------------------------------------
*
* PrintMCU --
*
* Send an MCU in quasi-readable form to stdout.
*
* Results:
* None.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
void
PrintMCU (compsInScan, mcu)
int compsInScan;
MCU mcu;
{
ComponentType r;
int b;
static int callCount;
for (b=0; b<compsInScan; b++) {
callCount++;
r = mcu[b];
printf ("%d: %d ", callCount, r);
printf ("\n");
}
}
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