/*
 * Copyright (c) 1999-2000 Image Power, Inc. and the University of
 *   British Columbia.
 * Copyright (c) 2001-2003 Michael David Adams.
 * All rights reserved.
 */

/* __START_OF_JASPER_LICENSE__
 * 
 * JasPer License Version 2.0
 * 
 * Copyright (c) 1999-2000 Image Power, Inc.
 * Copyright (c) 1999-2000 The University of British Columbia
 * Copyright (c) 2001-2003 Michael David Adams
 * 
 * All rights reserved.
 * 
 * Permission is hereby granted, free of charge, to any person (the
 * "User") obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge,
 * publish, distribute, and/or sell copies of the Software, and to permit
 * persons to whom the Software is furnished to do so, subject to the
 * following conditions:
 * 
 * 1.  The above copyright notices and this permission notice (which
 * includes the disclaimer below) shall be included in all copies or
 * substantial portions of the Software.
 * 
 * 2.  The name of a copyright holder shall not be used to endorse or
 * promote products derived from the Software without specific prior
 * written permission.
 * 
 * THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS
 * LICENSE.  NO USE OF THE SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER
 * THIS DISCLAIMER.  THE SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS
 * "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.  IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
 * INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.  NO ASSURANCES ARE
 * PROVIDED BY THE COPYRIGHT HOLDERS THAT THE SOFTWARE DOES NOT INFRINGE
 * THE PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OF ANY OTHER ENTITY.
 * EACH COPYRIGHT HOLDER DISCLAIMS ANY LIABILITY TO THE USER FOR CLAIMS
 * BROUGHT BY ANY OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL
 * PROPERTY RIGHTS OR OTHERWISE.  AS A CONDITION TO EXERCISING THE RIGHTS
 * GRANTED HEREUNDER, EACH USER HEREBY ASSUMES SOLE RESPONSIBILITY TO SECURE
 * ANY OTHER INTELLECTUAL PROPERTY RIGHTS NEEDED, IF ANY.  THE SOFTWARE
 * IS NOT FAULT-TOLERANT AND IS NOT INTENDED FOR USE IN MISSION-CRITICAL
 * SYSTEMS, SUCH AS THOSE USED IN THE OPERATION OF NUCLEAR FACILITIES,
 * AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL
 * SYSTEMS, DIRECT LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH
 * THE FAILURE OF THE SOFTWARE OR SYSTEM COULD LEAD DIRECTLY TO DEATH,
 * PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH
 * RISK ACTIVITIES").  THE COPYRIGHT HOLDERS SPECIFICALLY DISCLAIM ANY
 * EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES.
 * 
 * __END_OF_JASPER_LICENSE__
 */

/*
 * Tier-2 Coding Library
 *
 * $Id: jpc_t2cod.c,v 1.1 2005/05/22 18:33:05 malaterre Exp $
 */

#include "jasper/jas_math.h"
#include "jasper/jas_malloc.h"
#include "jasper/jas_math.h"

#include "jpc_cs.h"
#include "jpc_t2cod.h"
#include "jpc_math.h"

static int jpc_pi_nextlrcp(jpc_pi_t *pi);
static int jpc_pi_nextrlcp(jpc_pi_t *pi);
static int jpc_pi_nextrpcl(jpc_pi_t *pi);
static int jpc_pi_nextpcrl(jpc_pi_t *pi);
static int jpc_pi_nextcprl(jpc_pi_t *pi);

int jpc_pi_next(jpc_pi_t *pi)
{
  jpc_pchg_t *pchg;
  int ret;


  for (;;) {

    pi->valid = false;

    if (!pi->pchg) {
      ++pi->pchgno;
      pi->compno = 0;
      pi->rlvlno = 0;
      pi->prcno = 0;
      pi->lyrno = 0;
      pi->prgvolfirst = true;
      if (pi->pchgno < jpc_pchglist_numpchgs(pi->pchglist)) {
        pi->pchg = jpc_pchglist_get(pi->pchglist, pi->pchgno);
      } else if (pi->pchgno == jpc_pchglist_numpchgs(pi->pchglist)) {
        pi->pchg = &pi->defaultpchg;
      } else {
        return 1;
      }
    }

    pchg = pi->pchg;
    switch (pchg->prgord) {
    case JPC_COD_LRCPPRG:
      ret = jpc_pi_nextlrcp(pi);
      break;
    case JPC_COD_RLCPPRG:
      ret = jpc_pi_nextrlcp(pi);
      break;
    case JPC_COD_RPCLPRG:
      ret = jpc_pi_nextrpcl(pi);
      break;
    case JPC_COD_PCRLPRG:
      ret = jpc_pi_nextpcrl(pi);
      break;
    case JPC_COD_CPRLPRG:
      ret = jpc_pi_nextcprl(pi);
      break;
    default:
      ret = -1;
      break;
    }
    if (!ret) {
      pi->valid = true;
      ++pi->pktno;
      return 0;
    }
    pi->pchg = 0;
  }
}

static int jpc_pi_nextlrcp(register jpc_pi_t *pi)
{
  jpc_pchg_t *pchg;
  int *prclyrno;

  pchg = pi->pchg;
  if (!pi->prgvolfirst) {
    prclyrno = &pi->pirlvl->prclyrnos[pi->prcno];
    goto skip;
  } else {
    pi->prgvolfirst = false;
  }

  for (pi->lyrno = 0; pi->lyrno < pi->numlyrs && pi->lyrno <
    JAS_CAST(int, pchg->lyrnoend); ++pi->lyrno) {
    for (pi->rlvlno = pchg->rlvlnostart; pi->rlvlno < pi->maxrlvls &&
      pi->rlvlno < pchg->rlvlnoend; ++pi->rlvlno) {
      for (pi->compno = pchg->compnostart, pi->picomp =
        &pi->picomps[pi->compno]; pi->compno < pi->numcomps
        && pi->compno < JAS_CAST(int, pchg->compnoend); ++pi->compno,
        ++pi->picomp) {
        if (pi->rlvlno >= pi->picomp->numrlvls) {
          continue;
        }
        pi->pirlvl = &pi->picomp->pirlvls[pi->rlvlno];
        for (pi->prcno = 0, prclyrno =
          pi->pirlvl->prclyrnos; pi->prcno <
          pi->pirlvl->numprcs; ++pi->prcno,
          ++prclyrno) {
          if (pi->lyrno >= *prclyrno) {
            *prclyrno = pi->lyrno;
            ++(*prclyrno);
            return 0;
          }
skip:
          ;
        }
      }
    }
  }
  return 1;
}

static int jpc_pi_nextrlcp(register jpc_pi_t *pi)
{
  jpc_pchg_t *pchg;
  int *prclyrno;

  pchg = pi->pchg;
  if (!pi->prgvolfirst) {
    assert(pi->prcno < pi->pirlvl->numprcs);
    prclyrno = &pi->pirlvl->prclyrnos[pi->prcno];
    goto skip;
  } else {
    pi->prgvolfirst = 0;
  }

  for (pi->rlvlno = pchg->rlvlnostart; pi->rlvlno < pi->maxrlvls &&
    pi->rlvlno < pchg->rlvlnoend; ++pi->rlvlno) {
    for (pi->lyrno = 0; pi->lyrno < pi->numlyrs && pi->lyrno <
      JAS_CAST(int, pchg->lyrnoend); ++pi->lyrno) {
      for (pi->compno = pchg->compnostart, pi->picomp =
        &pi->picomps[pi->compno]; pi->compno < pi->numcomps &&
        pi->compno < JAS_CAST(int, pchg->compnoend); ++pi->compno, ++pi->picomp) {
        if (pi->rlvlno >= pi->picomp->numrlvls) {
          continue;
        }
        pi->pirlvl = &pi->picomp->pirlvls[pi->rlvlno];
        for (pi->prcno = 0, prclyrno = pi->pirlvl->prclyrnos;
          pi->prcno < pi->pirlvl->numprcs; ++pi->prcno, ++prclyrno) {
          if (pi->lyrno >= *prclyrno) {
            *prclyrno = pi->lyrno;
            ++(*prclyrno);
            return 0;
          }
skip:
          ;
        }
      }
    }
  }
  return 1;
}

static int jpc_pi_nextrpcl(register jpc_pi_t *pi)
{
  int rlvlno;
  jpc_pirlvl_t *pirlvl;
  jpc_pchg_t *pchg;
  int prchind;
  int prcvind;
  int *prclyrno;
  int compno;
  jpc_picomp_t *picomp;
  int xstep;
  int ystep;
  uint_fast32_t r;
  uint_fast32_t rpx;
  uint_fast32_t rpy;
  uint_fast32_t trx0;
  uint_fast32_t try0;

  pchg = pi->pchg;
  if (!pi->prgvolfirst) {
    goto skip;
  } else {
    pi->xstep = 0;
    pi->ystep = 0;
    for (compno = 0, picomp = pi->picomps; compno < pi->numcomps;
      ++compno, ++picomp) {
      for (rlvlno = 0, pirlvl = picomp->pirlvls; rlvlno <
        picomp->numrlvls; ++rlvlno, ++pirlvl) {
        xstep = picomp->hsamp * (1 << (pirlvl->prcwidthexpn +
          picomp->numrlvls - rlvlno - 1));
        ystep = picomp->vsamp * (1 << (pirlvl->prcheightexpn +
          picomp->numrlvls - rlvlno - 1));
        pi->xstep = (!pi->xstep) ? xstep : JAS_MIN(pi->xstep, xstep);
        pi->ystep = (!pi->ystep) ? ystep : JAS_MIN(pi->ystep, ystep);
      }
    }
    pi->prgvolfirst = 0;
  }

  for (pi->rlvlno = pchg->rlvlnostart; pi->rlvlno < pchg->rlvlnoend &&
    pi->rlvlno < pi->maxrlvls; ++pi->rlvlno) {
    for (pi->y = pi->ystart; pi->y < pi->yend; pi->y +=
      pi->ystep - (pi->y % pi->ystep)) {
      for (pi->x = pi->xstart; pi->x < pi->xend; pi->x +=
        pi->xstep - (pi->x % pi->xstep)) {
        for (pi->compno = pchg->compnostart,
          pi->picomp = &pi->picomps[pi->compno];
          pi->compno < JAS_CAST(int, pchg->compnoend) && pi->compno <
          pi->numcomps; ++pi->compno, ++pi->picomp) {
          if (pi->rlvlno >= pi->picomp->numrlvls) {
            continue;
          }
          pi->pirlvl = &pi->picomp->pirlvls[pi->rlvlno];
          if (pi->pirlvl->numprcs == 0) {
            continue;
          }
          r = pi->picomp->numrlvls - 1 - pi->rlvlno;
          rpx = r + pi->pirlvl->prcwidthexpn;
          rpy = r + pi->pirlvl->prcheightexpn;
          trx0 = JPC_CEILDIV(pi->xstart, pi->picomp->hsamp << r);
          try0 = JPC_CEILDIV(pi->ystart, pi->picomp->vsamp << r);
          if (((pi->x == pi->xstart && ((trx0 << r) % (1 << rpx)))
            || !(pi->x % (1 << rpx))) &&
            ((pi->y == pi->ystart && ((try0 << r) % (1 << rpy)))
            || !(pi->y % (1 << rpy)))) {
            prchind = JPC_FLOORDIVPOW2(JPC_CEILDIV(pi->x, pi->picomp->hsamp
              << r), pi->pirlvl->prcwidthexpn) - JPC_FLOORDIVPOW2(trx0,
              pi->pirlvl->prcwidthexpn);
            prcvind = JPC_FLOORDIVPOW2(JPC_CEILDIV(pi->y, pi->picomp->vsamp
              << r), pi->pirlvl->prcheightexpn) - JPC_FLOORDIVPOW2(try0,
              pi->pirlvl->prcheightexpn);
            pi->prcno = prcvind * pi->pirlvl->numhprcs + prchind;

            assert(pi->prcno < pi->pirlvl->numprcs);
            for (pi->lyrno = 0; pi->lyrno <
              pi->numlyrs && pi->lyrno < JAS_CAST(int, pchg->lyrnoend); ++pi->lyrno) {
              prclyrno = &pi->pirlvl->prclyrnos[pi->prcno];
              if (pi->lyrno >= *prclyrno) {
                ++(*prclyrno);
                return 0;
              }
skip:
              ;
            }
          }
        }
      }
    }
  }
  return 1;
}

static int jpc_pi_nextpcrl(register jpc_pi_t *pi)
{
  int rlvlno;
  jpc_pirlvl_t *pirlvl;
  jpc_pchg_t *pchg;
  int prchind;
  int prcvind;
  int *prclyrno;
  int compno;
  jpc_picomp_t *picomp;
  int xstep;
  int ystep;
  uint_fast32_t trx0;
  uint_fast32_t try0;
  uint_fast32_t r;
  uint_fast32_t rpx;
  uint_fast32_t rpy;

  pchg = pi->pchg;
  if (!pi->prgvolfirst) {
    goto skip;
  } else {
    pi->xstep = 0;
    pi->ystep = 0;
    for (compno = 0, picomp = pi->picomps; compno < pi->numcomps;
      ++compno, ++picomp) {
      for (rlvlno = 0, pirlvl = picomp->pirlvls; rlvlno <
        picomp->numrlvls; ++rlvlno, ++pirlvl) {
        xstep = picomp->hsamp * (1 <<
          (pirlvl->prcwidthexpn + picomp->numrlvls -
          rlvlno - 1));
        ystep = picomp->vsamp * (1 <<
          (pirlvl->prcheightexpn + picomp->numrlvls -
          rlvlno - 1));
        pi->xstep = (!pi->xstep) ? xstep :
          JAS_MIN(pi->xstep, xstep);
        pi->ystep = (!pi->ystep) ? ystep :
          JAS_MIN(pi->ystep, ystep);
      }
    }
    pi->prgvolfirst = 0;
  }

  for (pi->y = pi->ystart; pi->y < pi->yend; pi->y += pi->ystep -
    (pi->y % pi->ystep)) {
    for (pi->x = pi->xstart; pi->x < pi->xend; pi->x += pi->xstep -
      (pi->x % pi->xstep)) {
      for (pi->compno = pchg->compnostart, pi->picomp =
        &pi->picomps[pi->compno]; pi->compno < pi->numcomps
        && pi->compno < JAS_CAST(int, pchg->compnoend); ++pi->compno,
        ++pi->picomp) {
        for (pi->rlvlno = pchg->rlvlnostart,
          pi->pirlvl = &pi->picomp->pirlvls[pi->rlvlno];
          pi->rlvlno < pi->picomp->numrlvls &&
          pi->rlvlno < pchg->rlvlnoend; ++pi->rlvlno,
          ++pi->pirlvl) {
          if (pi->pirlvl->numprcs == 0) {
            continue;
          }
          r = pi->picomp->numrlvls - 1 - pi->rlvlno;
          trx0 = JPC_CEILDIV(pi->xstart, pi->picomp->hsamp << r);
          try0 = JPC_CEILDIV(pi->ystart, pi->picomp->vsamp << r);
          rpx = r + pi->pirlvl->prcwidthexpn;
          rpy = r + pi->pirlvl->prcheightexpn;
          if (((pi->x == pi->xstart && ((trx0 << r) % (1 << rpx))) ||
            !(pi->x % (pi->picomp->hsamp << rpx))) &&
            ((pi->y == pi->ystart && ((try0 << r) % (1 << rpy))) ||
            !(pi->y % (pi->picomp->vsamp << rpy)))) {
            prchind = JPC_FLOORDIVPOW2(JPC_CEILDIV(pi->x, pi->picomp->hsamp
              << r), pi->pirlvl->prcwidthexpn) - JPC_FLOORDIVPOW2(trx0,
              pi->pirlvl->prcwidthexpn);
            prcvind = JPC_FLOORDIVPOW2(JPC_CEILDIV(pi->y, pi->picomp->vsamp
              << r), pi->pirlvl->prcheightexpn) - JPC_FLOORDIVPOW2(try0,
              pi->pirlvl->prcheightexpn);
            pi->prcno = prcvind * pi->pirlvl->numhprcs + prchind;
            assert(pi->prcno < pi->pirlvl->numprcs);
            for (pi->lyrno = 0; pi->lyrno < pi->numlyrs &&
              pi->lyrno < JAS_CAST(int, pchg->lyrnoend); ++pi->lyrno) {
              prclyrno = &pi->pirlvl->prclyrnos[pi->prcno];
              if (pi->lyrno >= *prclyrno) {
                ++(*prclyrno);
                return 0;
              }
skip:
              ;
            }
          }
        }
      }
    }
  }
  return 1;
}

static int jpc_pi_nextcprl(register jpc_pi_t *pi)
{
  int rlvlno;
  jpc_pirlvl_t *pirlvl;
  jpc_pchg_t *pchg;
  int prchind;
  int prcvind;
  int *prclyrno;
  uint_fast32_t trx0;
  uint_fast32_t try0;
  uint_fast32_t r;
  uint_fast32_t rpx;
  uint_fast32_t rpy;

  pchg = pi->pchg;
  if (!pi->prgvolfirst) {
    goto skip;
  } else {
    pi->prgvolfirst = 0;
  }

  for (pi->compno = pchg->compnostart, pi->picomp =
    &pi->picomps[pi->compno]; pi->compno < JAS_CAST(int, pchg->compnoend); ++pi->compno,
    ++pi->picomp) {
    pirlvl = pi->picomp->pirlvls;
    pi->xstep = pi->picomp->hsamp * (1 << (pirlvl->prcwidthexpn +
      pi->picomp->numrlvls - 1));
    pi->ystep = pi->picomp->vsamp * (1 << (pirlvl->prcheightexpn +
      pi->picomp->numrlvls - 1));
    for (rlvlno = 1, pirlvl = &pi->picomp->pirlvls[1];
      rlvlno < pi->picomp->numrlvls; ++rlvlno, ++pirlvl) {
      pi->xstep = JAS_MIN(pi->xstep, pi->picomp->hsamp * (1 <<
        (pirlvl->prcwidthexpn + pi->picomp->numrlvls -
        rlvlno - 1)));
      pi->ystep = JAS_MIN(pi->ystep, pi->picomp->vsamp * (1 <<
        (pirlvl->prcheightexpn + pi->picomp->numrlvls -
        rlvlno - 1)));
    }
    for (pi->y = pi->ystart; pi->y < pi->yend;
      pi->y += pi->ystep - (pi->y % pi->ystep)) {
      for (pi->x = pi->xstart; pi->x < pi->xend;
        pi->x += pi->xstep - (pi->x % pi->xstep)) {
        for (pi->rlvlno = pchg->rlvlnostart,
          pi->pirlvl = &pi->picomp->pirlvls[pi->rlvlno];
          pi->rlvlno < pi->picomp->numrlvls && pi->rlvlno <
          pchg->rlvlnoend; ++pi->rlvlno, ++pi->pirlvl) {
          if (pi->pirlvl->numprcs == 0) {
            continue;
          }
          r = pi->picomp->numrlvls - 1 - pi->rlvlno;
          trx0 = JPC_CEILDIV(pi->xstart, pi->picomp->hsamp << r);
          try0 = JPC_CEILDIV(pi->ystart, pi->picomp->vsamp << r);
          rpx = r + pi->pirlvl->prcwidthexpn;
          rpy = r + pi->pirlvl->prcheightexpn;
          if (((pi->x == pi->xstart && ((trx0 << r) % (1 << rpx))) ||
            !(pi->x % (pi->picomp->hsamp << rpx))) &&
            ((pi->y == pi->ystart && ((try0 << r) % (1 << rpy))) ||
            !(pi->y % (pi->picomp->vsamp << rpy)))) {
            prchind = JPC_FLOORDIVPOW2(JPC_CEILDIV(pi->x, pi->picomp->hsamp
              << r), pi->pirlvl->prcwidthexpn) - JPC_FLOORDIVPOW2(trx0,
              pi->pirlvl->prcwidthexpn);
            prcvind = JPC_FLOORDIVPOW2(JPC_CEILDIV(pi->y, pi->picomp->vsamp
              << r), pi->pirlvl->prcheightexpn) - JPC_FLOORDIVPOW2(try0,
              pi->pirlvl->prcheightexpn);
            pi->prcno = prcvind *
              pi->pirlvl->numhprcs +
              prchind;
            assert(pi->prcno <
              pi->pirlvl->numprcs);
            for (pi->lyrno = 0; pi->lyrno <
              pi->numlyrs && pi->lyrno < JAS_CAST(int, pchg->lyrnoend); ++pi->lyrno) {
              prclyrno = &pi->pirlvl->prclyrnos[pi->prcno];
              if (pi->lyrno >= *prclyrno) {
                ++(*prclyrno);
                return 0;
              }
skip:
              ;
            }
          }
        }
      }
    }
  }
  return 1;
}

static void pirlvl_destroy(jpc_pirlvl_t *rlvl)
{
  if (rlvl->prclyrnos) {
    jas_free(rlvl->prclyrnos);
  }
}

static void jpc_picomp_destroy(jpc_picomp_t *picomp)
{
  int rlvlno;
  jpc_pirlvl_t *pirlvl;
  if (picomp->pirlvls) {
    for (rlvlno = 0, pirlvl = picomp->pirlvls; rlvlno <
      picomp->numrlvls; ++rlvlno, ++pirlvl) {
      pirlvl_destroy(pirlvl);
    }
    jas_free(picomp->pirlvls);
  }
}

void jpc_pi_destroy(jpc_pi_t *pi)
{
  jpc_picomp_t *picomp;
  int compno;
  if (pi->picomps) {
    for (compno = 0, picomp = pi->picomps; compno < pi->numcomps;
      ++compno, ++picomp) {
      jpc_picomp_destroy(picomp);
    }
    jas_free(pi->picomps);
  }
  if (pi->pchglist) {
    jpc_pchglist_destroy(pi->pchglist);
  }
  jas_free(pi);
}

jpc_pi_t *jpc_pi_create0()
{
  jpc_pi_t *pi;
  if (!(pi = jas_malloc(sizeof(jpc_pi_t)))) {
    return 0;
  }
  pi->picomps = 0;
  pi->pchgno = 0;
  if (!(pi->pchglist = jpc_pchglist_create())) {
    jas_free(pi);
    return 0;
  }
  return pi;
}

int jpc_pi_addpchg(jpc_pi_t *pi, jpc_pocpchg_t *pchg)
{
  return jpc_pchglist_insert(pi->pchglist, -1, pchg);
}

jpc_pchglist_t *jpc_pchglist_create()
{
  jpc_pchglist_t *pchglist;
  if (!(pchglist = jas_malloc(sizeof(jpc_pchglist_t)))) {
    return 0;
  }
  pchglist->numpchgs = 0;
  pchglist->maxpchgs = 0;
  pchglist->pchgs = 0;
  return pchglist;
}

int jpc_pchglist_insert(jpc_pchglist_t *pchglist, int pchgno, jpc_pchg_t *pchg)
{
  int i;
  int newmaxpchgs;
  jpc_pchg_t **newpchgs;
  if (pchgno < 0) {
    pchgno = pchglist->numpchgs;
  }
  if (pchglist->numpchgs >= pchglist->maxpchgs) {
    newmaxpchgs = pchglist->maxpchgs + 128;
    if (!(newpchgs = jas_realloc(pchglist->pchgs, newmaxpchgs * sizeof(jpc_pchg_t *)))) {
      return -1;
    }
    pchglist->maxpchgs = newmaxpchgs;
    pchglist->pchgs = newpchgs;
  }
  for (i = pchglist->numpchgs; i > pchgno; --i) {
    pchglist->pchgs[i] = pchglist->pchgs[i - 1];
  }
  pchglist->pchgs[pchgno] = pchg;
  ++pchglist->numpchgs;
  return 0;
}

jpc_pchg_t *jpc_pchglist_remove(jpc_pchglist_t *pchglist, int pchgno)
{
  int i;
  jpc_pchg_t *pchg;
  assert(pchgno < pchglist->numpchgs);
  pchg = pchglist->pchgs[pchgno];
  for (i = pchgno + 1; i < pchglist->numpchgs; ++i) {
    pchglist->pchgs[i - 1] = pchglist->pchgs[i];
  }
  --pchglist->numpchgs;
  return pchg;
}

jpc_pchg_t *jpc_pchg_copy(jpc_pchg_t *pchg)
{
  jpc_pchg_t *newpchg;
  if (!(newpchg = jas_malloc(sizeof(jpc_pchg_t)))) {
    return 0;
  }
  *newpchg = *pchg;
  return newpchg;
}

jpc_pchglist_t *jpc_pchglist_copy(jpc_pchglist_t *pchglist)
{
  jpc_pchglist_t *newpchglist;
  jpc_pchg_t *newpchg;
  int pchgno;
  if (!(newpchglist = jpc_pchglist_create())) {
    return 0;
  }
  for (pchgno = 0; pchgno < pchglist->numpchgs; ++pchgno) {
    if (!(newpchg = jpc_pchg_copy(pchglist->pchgs[pchgno])) ||
      jpc_pchglist_insert(newpchglist, -1, newpchg)) {
      jpc_pchglist_destroy(newpchglist);
      return 0;
    }
  }
  return newpchglist;
}

void jpc_pchglist_destroy(jpc_pchglist_t *pchglist)
{
  int pchgno;
  if (pchglist->pchgs) {
    for (pchgno = 0; pchgno < pchglist->numpchgs; ++pchgno) {
      jpc_pchg_destroy(pchglist->pchgs[pchgno]);
    }
    jas_free(pchglist->pchgs);
  }
  jas_free(pchglist);
}

void jpc_pchg_destroy(jpc_pchg_t *pchg)
{
  jas_free(pchg);
}

jpc_pchg_t *jpc_pchglist_get(jpc_pchglist_t *pchglist, int pchgno)
{
  return pchglist->pchgs[pchgno];
}

int jpc_pchglist_numpchgs(jpc_pchglist_t *pchglist)
{
  return pchglist->numpchgs;
}

int jpc_pi_init(jpc_pi_t *pi)
{
  int compno;
  int rlvlno;
  int prcno;
  jpc_picomp_t *picomp;
  jpc_pirlvl_t *pirlvl;
  int *prclyrno;

  pi->prgvolfirst = 0;
  pi->valid = 0;
  pi->pktno = -1;
  pi->pchgno = -1;
  pi->pchg = 0;

  for (compno = 0, picomp = pi->picomps; compno < pi->numcomps;
    ++compno, ++picomp) {
    for (rlvlno = 0, pirlvl = picomp->pirlvls; rlvlno <
      picomp->numrlvls; ++rlvlno, ++pirlvl) {
      for (prcno = 0, prclyrno = pirlvl->prclyrnos;
        prcno < pirlvl->numprcs; ++prcno, ++prclyrno) {
        *prclyrno = 0;
      }
    }
  }
  return 0;
}