24030044940

Committed 06 Apr 2026 11:26AM UTC coverage: 42.336% (+0.001%) from 42.335%

Build # 24030044940

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Commit Message

Fix segmentation fault in PHP MapScriptNG (fixes #6787) (#7471)

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73.27

/src/maputil.c

/******************************************************************************
 * $Id$
 *
 * Project:  MapServer
 * Purpose:  Various utility functions ... a real hodgepodge.
 * Author:   Steve Lime and the MapServer team.
 *
 * Notes: Some code (notably msAlphaBlend()) are directly derived from GD. See
 * the mapserver/GD-COPYING file for the GD license.  Use of this code in this
 * manner is compatible with the MapServer license.
 *
 ******************************************************************************
 * Copyright (c) 1996-2005 Regents of the University of Minnesota.
 *
 * Permission is hereby granted, free of charge, to any person 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, sublicense,
 * 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:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies of this Software or works derived from this Software.
 *
 * THE SOFTWARE IS PROVIDED "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. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *****************************************************************************/

#include <math.h>
#include <time.h>

#include "mapserver.h"
#include "maptime.h"
#include "mapthread.h"
#include "mapcopy.h"
#include "mapows.h"

#include "gdal.h"
#include "cpl_conv.h"

#if defined(_WIN32) && !defined(__CYGWIN__)
#include <windows.h>
#include <tchar.h>
#include <fcntl.h>
#include <io.h>
#include <process.h>
#endif

#ifdef USE_RSVG
#include <glib-object.h>
#endif
#ifdef USE_GEOS
#include <geos_c.h>
#endif

extern char *msyystring_buffer;
extern int msyylex_destroy(void);
extern int yyparse(parseObj *);

int gdal_destroyed = 0;

int msScaleInBounds(double scale, double minscale, double maxscale) {
  if (scale > 0) {
    if (maxscale != -1 && scale >= maxscale)
      return MS_FALSE;
    if (minscale != -1 && scale < minscale)
      return MS_FALSE;
  }
  return MS_TRUE;
}

/*
** Helper functions to convert from strings to other types or objects.
*/
static int bindIntegerAttribute(int *attribute, const char *value) {
  if (!value || strlen(value) == 0)
    return MS_FAILURE;
  *attribute =
      MS_NINT(atof(value)); /*use atof instead of atoi as a fix for bug 2394*/
  return MS_SUCCESS;
}

static int bindDoubleAttribute(double *attribute, const char *value) {
  if (!value || strlen(value) == 0)
    return MS_FAILURE;
  *attribute = atof(value);
  return MS_SUCCESS;
}

static int bindColorAttribute(colorObj *attribute, const char *value) {
  int len;

  if (!value || ((len = strlen(value)) == 0))
    return MS_FAILURE;

  if (value[0] == '#' && (len == 7 || len == 9)) { /* got a hex color */
    char hex[2];

    hex[0] = value[1];
    hex[1] = value[2];
    attribute->red = msHexToInt(hex);
    hex[0] = value[3];
    hex[1] = value[4];
    attribute->green = msHexToInt(hex);
    hex[0] = value[5];
    hex[1] = value[6];
    attribute->blue = msHexToInt(hex);
    if (len == 9) {
      hex[0] = value[7];
      hex[1] = value[8];
      attribute->alpha = msHexToInt(hex);
    }
    return MS_SUCCESS;
  } else { /* try a space delimited string */
    char **tokens = NULL;
    int numtokens = 0;

    tokens = msStringSplit(value, ' ', &numtokens);
    if (tokens == NULL || numtokens != 3) {
      msFreeCharArray(tokens, numtokens);
      return MS_FAILURE; /* punt */
    }

    attribute->red = atoi(tokens[0]);
    attribute->green = atoi(tokens[1]);
    attribute->blue = atoi(tokens[2]);
    msFreeCharArray(tokens, numtokens);

    return MS_SUCCESS;
  }

  return MS_FAILURE; /* shouldn't get here */
}

static void bindStyle(layerObj *layer, shapeObj *shape, styleObj *style,
                      int drawmode) {
  int applyOpacity = MS_FALSE;
  assert(MS_DRAW_FEATURES(drawmode));
  if (style->numbindings > 0) {
    applyOpacity = MS_TRUE;
    if (style->bindings[MS_STYLE_BINDING_SYMBOL].index != -1) {
      style->symbol = msGetSymbolIndex(
          &(layer->map->symbolset),
          shape->values[style->bindings[MS_STYLE_BINDING_SYMBOL].index],
          MS_TRUE);
      if (style->symbol == -1)
        style->symbol =
            0; /* a reasonable default (perhaps should throw an error?) */
    }
    if (style->bindings[MS_STYLE_BINDING_ANGLE].index != -1) {
      style->angle = 360.0;
      bindDoubleAttribute(
          &style->angle,
          shape->values[style->bindings[MS_STYLE_BINDING_ANGLE].index]);
    }
    if (style->bindings[MS_STYLE_BINDING_SIZE].index != -1) {
      style->size = 1;
      bindDoubleAttribute(
          &style->size,
          shape->values[style->bindings[MS_STYLE_BINDING_SIZE].index]);
    }
    if (style->bindings[MS_STYLE_BINDING_WIDTH].index != -1) {
      style->width = 1;
      bindDoubleAttribute(
          &style->width,
          shape->values[style->bindings[MS_STYLE_BINDING_WIDTH].index]);
    }
    if (style->bindings[MS_STYLE_BINDING_COLOR].index != -1 &&
        !MS_DRAW_QUERY(drawmode)) {
      MS_INIT_COLOR(style->color, -1, -1, -1, 255);
      bindColorAttribute(
          &style->color,
          shape->values[style->bindings[MS_STYLE_BINDING_COLOR].index]);
    }
    if (style->bindings[MS_STYLE_BINDING_OUTLINECOLOR].index != -1 &&
        !MS_DRAW_QUERY(drawmode)) {
      MS_INIT_COLOR(style->outlinecolor, -1, -1, -1, 255);
      bindColorAttribute(
          &style->outlinecolor,
          shape->values[style->bindings[MS_STYLE_BINDING_OUTLINECOLOR].index]);
    }
    if (style->bindings[MS_STYLE_BINDING_OUTLINEWIDTH].index != -1) {
      style->outlinewidth = 1;
      bindDoubleAttribute(
          &style->outlinewidth,
          shape->values[style->bindings[MS_STYLE_BINDING_OUTLINEWIDTH].index]);
    }
    if (style->bindings[MS_STYLE_BINDING_OPACITY].index != -1) {
      style->opacity = 100;
      bindIntegerAttribute(
          &style->opacity,
          shape->values[style->bindings[MS_STYLE_BINDING_OPACITY].index]);
    }
    if (style->bindings[MS_STYLE_BINDING_OFFSET_X].index != -1) {
      style->offsetx = 0;
      bindDoubleAttribute(
          &style->offsetx,
          shape->values[style->bindings[MS_STYLE_BINDING_OFFSET_X].index]);
    }
    if (style->bindings[MS_STYLE_BINDING_OFFSET_Y].index != -1) {
      style->offsety = 0;
      bindDoubleAttribute(
          &style->offsety,
          shape->values[style->bindings[MS_STYLE_BINDING_OFFSET_Y].index]);
    }
    if (style->bindings[MS_STYLE_BINDING_POLAROFFSET_PIXEL].index != -1) {
      style->polaroffsetpixel = 0;
      bindDoubleAttribute(
          &style->polaroffsetpixel,
          shape->values[style->bindings[MS_STYLE_BINDING_POLAROFFSET_PIXEL]
                            .index]);
    }
    if (style->bindings[MS_STYLE_BINDING_POLAROFFSET_ANGLE].index != -1) {
      style->polaroffsetangle = 0;
      bindDoubleAttribute(
          &style->polaroffsetangle,
          shape->values[style->bindings[MS_STYLE_BINDING_POLAROFFSET_ANGLE]
                            .index]);
    }
  }
  if (style->nexprbindings > 0) {
    applyOpacity = MS_TRUE;
    if (style->exprBindings[MS_STYLE_BINDING_OFFSET_X].type == MS_EXPRESSION) {
      style->offsetx = msEvalDoubleExpression(
          &(style->exprBindings[MS_STYLE_BINDING_OFFSET_X]), shape);
    }
    if (style->exprBindings[MS_STYLE_BINDING_OFFSET_Y].type == MS_EXPRESSION) {
      style->offsety = msEvalDoubleExpression(
          &(style->exprBindings[MS_STYLE_BINDING_OFFSET_Y]), shape);
    }
    if (style->exprBindings[MS_STYLE_BINDING_ANGLE].type == MS_EXPRESSION) {
      style->angle = msEvalDoubleExpression(
          &(style->exprBindings[MS_STYLE_BINDING_ANGLE]), shape);
    }
    if (style->exprBindings[MS_STYLE_BINDING_SIZE].type == MS_EXPRESSION) {
      style->size = msEvalDoubleExpression(
          &(style->exprBindings[MS_STYLE_BINDING_SIZE]), shape);
    }
    if (style->exprBindings[MS_STYLE_BINDING_WIDTH].type == MS_EXPRESSION) {
      style->width = msEvalDoubleExpression(
          &(style->exprBindings[MS_STYLE_BINDING_WIDTH]), shape);
    }
    if (style->exprBindings[MS_STYLE_BINDING_OPACITY].type == MS_EXPRESSION) {
      style->opacity =
          100 * msEvalDoubleExpression(
                    &(style->exprBindings[MS_STYLE_BINDING_OPACITY]), shape);
    }
    if (style->exprBindings[MS_STYLE_BINDING_OUTLINECOLOR].type ==
        MS_EXPRESSION) {
      char *txt = msEvalTextExpression(
          &(style->exprBindings[MS_STYLE_BINDING_OUTLINECOLOR]), shape);
      bindColorAttribute(&style->outlinecolor, txt);
      msFree(txt);
    }
    if (style->exprBindings[MS_STYLE_BINDING_COLOR].type == MS_EXPRESSION) {
      char *txt = msEvalTextExpression(
          &(style->exprBindings[MS_STYLE_BINDING_COLOR]), shape);
      bindColorAttribute(&style->color, txt);
      msFree(txt);
    }
  }

  if (applyOpacity == MS_TRUE && style->opacity < 100) {
    int alpha;
    alpha = MS_NINT(style->opacity * 2.55);
    style->color.alpha = alpha;
    style->outlinecolor.alpha = alpha;
    style->mincolor.alpha = alpha;
    style->maxcolor.alpha = alpha;
  }
}

static void bindLabel(layerObj *layer, shapeObj *shape, labelObj *label,
                      int drawmode) {
  int i;
  assert(MS_DRAW_LABELS(drawmode));

  /* check the label styleObj's (TODO: do we need to use querymapMode here? */
  for (i = 0; i < label->numstyles; i++) {
    /* force MS_DRAWMODE_FEATURES for label styles */
    bindStyle(layer, shape, label->styles[i], drawmode | MS_DRAWMODE_FEATURES);
  }

  if (label->numbindings > 0) {
    if (label->bindings[MS_LABEL_BINDING_ANGLE].index != -1) {
      label->angle = 0.0;
      bindDoubleAttribute(
          &label->angle,
          shape->values[label->bindings[MS_LABEL_BINDING_ANGLE].index]);
    }

    if (label->bindings[MS_LABEL_BINDING_SIZE].index != -1) {
      label->size = 1;
      bindIntegerAttribute(
          &label->size,
          shape->values[label->bindings[MS_LABEL_BINDING_SIZE].index]);
    }

    if (label->bindings[MS_LABEL_BINDING_COLOR].index != -1) {
      MS_INIT_COLOR(label->color, -1, -1, -1, 255);
      bindColorAttribute(
          &label->color,
          shape->values[label->bindings[MS_LABEL_BINDING_COLOR].index]);
    }

    if (label->bindings[MS_LABEL_BINDING_OUTLINECOLOR].index != -1) {
      MS_INIT_COLOR(label->outlinecolor, -1, -1, -1, 255);
      bindColorAttribute(
          &label->outlinecolor,
          shape->values[label->bindings[MS_LABEL_BINDING_OUTLINECOLOR].index]);
    }

    if (label->bindings[MS_LABEL_BINDING_FONT].index != -1) {
      msFree(label->font);
      label->font =
          msStrdup(shape->values[label->bindings[MS_LABEL_BINDING_FONT].index]);
    }

    if (label->bindings[MS_LABEL_BINDING_PRIORITY].index != -1) {
      label->priority = MS_DEFAULT_LABEL_PRIORITY;
      bindIntegerAttribute(
          &label->priority,
          shape->values[label->bindings[MS_LABEL_BINDING_PRIORITY].index]);
    }

    if (label->bindings[MS_LABEL_BINDING_SHADOWSIZEX].index != -1) {
      label->shadowsizex = 1;
      bindIntegerAttribute(
          &label->shadowsizex,
          shape->values[label->bindings[MS_LABEL_BINDING_SHADOWSIZEX].index]);
    }
    if (label->bindings[MS_LABEL_BINDING_SHADOWSIZEY].index != -1) {
      label->shadowsizey = 1;
      bindIntegerAttribute(
          &label->shadowsizey,
          shape->values[label->bindings[MS_LABEL_BINDING_SHADOWSIZEY].index]);
    }

    if (label->bindings[MS_LABEL_BINDING_OFFSET_X].index != -1) {
      label->offsetx = 0;
      bindIntegerAttribute(
          &label->offsetx,
          shape->values[label->bindings[MS_LABEL_BINDING_OFFSET_X].index]);
    }

    if (label->bindings[MS_LABEL_BINDING_OFFSET_Y].index != -1) {
      label->offsety = 0;
      bindIntegerAttribute(
          &label->offsety,
          shape->values[label->bindings[MS_LABEL_BINDING_OFFSET_Y].index]);
    }

    if (label->bindings[MS_LABEL_BINDING_ALIGN].index != -1) {
      int tmpAlign = 0;
      bindIntegerAttribute(
          &tmpAlign,
          shape->values[label->bindings[MS_LABEL_BINDING_ALIGN].index]);
      if (tmpAlign != 0) { /* is this test sufficient? */
        label->align = tmpAlign;
      } else { /* Integer binding failed, look for strings like cc, ul, lr,
                  etc... */
        if (strlen(
                shape->values[label->bindings[MS_LABEL_BINDING_ALIGN].index]) >=
            4) {
          char *va =
              shape->values[label->bindings[MS_LABEL_BINDING_ALIGN].index];
          if (!strncasecmp(va, "center", 5))
            label->align = MS_ALIGN_CENTER;
          else if (!strncasecmp(va, "left", 4))
            label->align = MS_ALIGN_LEFT;
          else if (!strncasecmp(va, "right", 5))
            label->align = MS_ALIGN_RIGHT;
        }
      }
    }

    if (label->bindings[MS_LABEL_BINDING_POSITION].index != -1) {
      int tmpPosition = 0;
      bindIntegerAttribute(
          &tmpPosition,
          shape->values[label->bindings[MS_LABEL_BINDING_POSITION].index]);
      if (tmpPosition != 0) { /* is this test sufficient? */
        label->position = tmpPosition;
      } else { /* Integer binding failed, look for strings like cc, ul, lr,
                  etc... */
        if (strlen(shape->values[label->bindings[MS_LABEL_BINDING_POSITION]
                                     .index]) == 2) {
          char *vp =
              shape->values[label->bindings[MS_LABEL_BINDING_POSITION].index];
          if (!strncasecmp(vp, "ul", 2))
            label->position = MS_UL;
          else if (!strncasecmp(vp, "lr", 2))
            label->position = MS_LR;
          else if (!strncasecmp(vp, "ur", 2))
            label->position = MS_UR;
          else if (!strncasecmp(vp, "ll", 2))
            label->position = MS_LL;
          else if (!strncasecmp(vp, "cr", 2))
            label->position = MS_CR;
          else if (!strncasecmp(vp, "cl", 2))
            label->position = MS_CL;
          else if (!strncasecmp(vp, "uc", 2))
            label->position = MS_UC;
          else if (!strncasecmp(vp, "lc", 2))
            label->position = MS_LC;
          else if (!strncasecmp(vp, "cc", 2))
            label->position = MS_CC;
        }
      }
    }
  }
  if (label->nexprbindings > 0) {
    if (label->exprBindings[MS_LABEL_BINDING_ANGLE].type == MS_EXPRESSION) {
      label->angle = msEvalDoubleExpression(
          &(label->exprBindings[MS_LABEL_BINDING_ANGLE]), shape);
    }
    if (label->exprBindings[MS_LABEL_BINDING_SIZE].type == MS_EXPRESSION) {
      label->size = msEvalDoubleExpression(
          &(label->exprBindings[MS_LABEL_BINDING_SIZE]), shape);
    }
    if (label->exprBindings[MS_LABEL_BINDING_COLOR].type == MS_EXPRESSION) {
      char *txt = msEvalTextExpression(
          &(label->exprBindings[MS_LABEL_BINDING_COLOR]), shape);
      bindColorAttribute(&label->color, txt);
      msFree(txt);
    }
    if (label->exprBindings[MS_LABEL_BINDING_OUTLINECOLOR].type ==
        MS_EXPRESSION) {
      char *txt = msEvalTextExpression(
          &(label->exprBindings[MS_LABEL_BINDING_OUTLINECOLOR]), shape);
      bindColorAttribute(&label->outlinecolor, txt);
      msFree(txt);
    }
    if (label->exprBindings[MS_LABEL_BINDING_PRIORITY].type == MS_EXPRESSION) {
      label->priority = msEvalDoubleExpression(
          &(label->exprBindings[MS_LABEL_BINDING_PRIORITY]), shape);
    }
  }
}

/*
** Function to bind various layer properties to shape attributes.
*/
int msBindLayerToShape(layerObj *layer, shapeObj *shape, int drawmode) {
  int i, j;

  if (!layer || !shape)
    return MS_FAILURE;

  for (i = 0; i < layer->numclasses; i++) {
    /* check the styleObj's */
    if (MS_DRAW_FEATURES(drawmode)) {
      for (j = 0; j < layer->class[i] -> numstyles; j++) {
        bindStyle(layer, shape, layer->class[i] -> styles[j], drawmode);
      }
    }

    /* check the labelObj's */
    if (MS_DRAW_LABELS(drawmode)) {
      for (j = 0; j < layer->class[i] -> numlabels; j++) {
        bindLabel(layer, shape, layer->class[i] -> labels[j], drawmode);
      }
    }
  } /* next classObj */

  return MS_SUCCESS;
}

/*
 * Used to get red, green, blue integers separately based upon the color index
 */
int getRgbColor(mapObj *map, int i, int *r, int *g, int *b) {
  /* check index range */
  int status = 1;
  *r = *g = *b = -1;
  if ((i > 0) && (i <= map->palette.numcolors)) {
    *r = map->palette.colors[i - 1].red;
    *g = map->palette.colors[i - 1].green;
    *b = map->palette.colors[i - 1].blue;
    status = 0;
  }
  return status;
}

static int searchContextForTag(mapObj *map, char **ltags, char *tag,
                               char *context, int requires) {
  int i;

  if (!context)
    return MS_FAILURE;

  /*  printf("\tin searchContextForTag, searching %s for %s\n", context, tag);
   */

  if (strstr(context, tag) != NULL)
    return MS_SUCCESS; /* found the tag */

  /* check referenced layers for the tag too */
  for (i = 0; i < map->numlayers; i++) {
    if (strstr(context, ltags[i]) != NULL) { /* need to check this layer */
      if (requires == MS_TRUE) {
        if (searchContextForTag(map, ltags, tag, GET_LAYER(map, i)->requires,
                                MS_TRUE) == MS_SUCCESS)
          return MS_SUCCESS;
      } else {
        if (searchContextForTag(map, ltags, tag,
                                GET_LAYER(map, i)->labelrequires,
                                MS_FALSE) == MS_SUCCESS)
          return MS_SUCCESS;
      }
    }
  }

  return MS_FAILURE;
}

/*
** Function to take a look at all layers with REQUIRES/LABELREQUIRES set to make
*sure there are no
** recursive context requirements set (e.g. layer1 requires layer2 and layer2
*requires layer1). This
** is bug 1059.
*/
int msValidateContexts(mapObj *map) {
  int i;
  char **ltags;
  int status = MS_SUCCESS;

  ltags = (char **)msSmallMalloc(map->numlayers * sizeof(char *));
  for (i = 0; i < map->numlayers; i++) {
    if (GET_LAYER(map, i)->name == NULL) {
      ltags[i] = msStrdup("[NULL]");
    } else {
      ltags[i] = (char *)msSmallMalloc(
          sizeof(char) * strlen(GET_LAYER(map, i)->name) + 3);
      sprintf(ltags[i], "[%s]", GET_LAYER(map, i)->name);
    }
  }

  /* check each layer's REQUIRES and LABELREQUIRES parameters */
  for (i = 0; i < map->numlayers; i++) {
    /* printf("working on layer %s, looking for references to %s\n",
     * GET_LAYER(map, i)->name, ltags[i]); */
    if (searchContextForTag(map, ltags, ltags[i], GET_LAYER(map, i)->requires,
                            MS_TRUE) == MS_SUCCESS) {
      msSetError(MS_PARSEERR,
                 "Recursion error found for REQUIRES parameter for layer %s.",
                 "msValidateContexts", GET_LAYER(map, i)->name);
      status = MS_FAILURE;
      break;
    }
    if (searchContextForTag(map, ltags, ltags[i],
                            GET_LAYER(map, i)->labelrequires,
                            MS_FALSE) == MS_SUCCESS) {
      msSetError(
          MS_PARSEERR,
          "Recursion error found for LABELREQUIRES parameter for layer %s.",
          "msValidateContexts", GET_LAYER(map, i)->name);
      status = MS_FAILURE;
      break;
    }
    /* printf("done layer %s\n", GET_LAYER(map, i)->name); */
  }

  /* clean up */
  msFreeCharArray(ltags, map->numlayers);

  return status;
}

int msEvalContext(mapObj *map, layerObj *layer, char *context) {
  int i, status;
  char *tag = NULL;
  tokenListNodeObjPtr token = NULL;

  expressionObj e;
  parseObj p;

  if (!context)
    return (MS_TRUE);

  /* initialize a temporary expression (e) */
  msInitExpression(&e);

  e.string = msStrdup(context);
  e.type = MS_EXPRESSION; /* todo */

  for (i = 0; i < map->numlayers; i++) { /* step through all the layers */
    if (layer->index == i)
      continue; /* skip the layer in question */
    if (GET_LAYER(map, i)->name == NULL)
      continue; /* Layer without name cannot be used in contexts */

    tag = (char *)msSmallMalloc(sizeof(char) * strlen(GET_LAYER(map, i)->name) +
                                3);
    sprintf(tag, "[%s]", GET_LAYER(map, i)->name);

    if (strstr(e.string, tag)) {
      if (msLayerIsVisible(map, (GET_LAYER(map, i))))
        e.string = msReplaceSubstring(e.string, tag, "1");
      else
        e.string = msReplaceSubstring(e.string, tag, "0");
    }

    free(tag);
  }

  msTokenizeExpression(&e, NULL, NULL);

  /*
   * We'll check for binding tokens in the token list. Since there is no shape
   * to bind to, the parser will crash if any are present.
   * This is one way to catch references to non-existent layers.
   */
  for (token = e.tokens; token; token = token->next) {
    if (token->token == MS_TOKEN_BINDING_DOUBLE ||
        token->token == MS_TOKEN_BINDING_STRING ||
        token->token == MS_TOKEN_BINDING_TIME) {
      msSetError(MS_PARSEERR,
                 "A non-existent layer is referenced in a LAYER REQUIRES or "
                 "LABELREQUIRES expression: %s",
                 "msEvalContext()", e.string);
      msFreeExpression(&e);
      return MS_FALSE;
    }
  }

  p.shape = NULL;
  p.expr = &e;
  p.expr->curtoken = p.expr->tokens; /* reset */
  p.type = MS_PARSE_TYPE_BOOLEAN;

  status = yyparse(&p);

  msFreeExpression(&e);

  if (status != 0) {
    msSetError(MS_PARSEERR, "Failed to parse context", "msEvalContext");
    return MS_FALSE; /* error in parse */
  }

  return p.result.intval;
}

/* msEvalExpression()
 *
 * Evaluates a mapserver expression for a given set of attribute values and
 * returns the result of the expression (MS_TRUE or MS_FALSE)
 * May also return MS_FALSE in case of parsing errors or invalid expressions
 * (check the error stack if you care)
 *
 */
int msEvalExpression(layerObj *layer, shapeObj *shape,
                     expressionObj *expression, int itemindex) {
  if (MS_STRING_IS_NULL_OR_EMPTY(expression->string))
    return MS_TRUE; /* NULL or empty expressions are ALWAYS true */
  if (expression->native_string != NULL)
    return MS_TRUE; /* expressions that are evaluated natively are ALWAYS true
                     */

  switch (expression->type) {
  case (MS_STRING):
    if (itemindex == -1) {
      msSetError(MS_MISCERR,
                 "Cannot evaluate expression, no item index defined.",
                 "msEvalExpression()");
      return MS_FALSE;
    }
    if (itemindex >= layer->numitems || itemindex >= shape->numvalues) {
      msSetError(MS_MISCERR, "Invalid item index.", "msEvalExpression()");
      return MS_FALSE;
    }
    if (expression->flags & MS_EXP_INSENSITIVE) {
      if (strcasecmp(expression->string, shape->values[itemindex]) == 0)
        return MS_TRUE; /* got a match */
    } else {
      if (strcmp(expression->string, shape->values[itemindex]) == 0)
        return MS_TRUE; /* got a match */
    }
    break;
  case (MS_LIST):
    if (itemindex == -1) {
      msSetError(MS_MISCERR,
                 "Cannot evaluate expression, no item index defined.",
                 "msEvalExpression()");
      return MS_FALSE;
    }
    if (itemindex >= layer->numitems || itemindex >= shape->numvalues) {
      msSetError(MS_MISCERR, "Invalid item index.", "msEvalExpression()");
      return MS_FALSE;
    }
    {
      char *start, *end;
      int value_len = strlen(shape->values[itemindex]);
      start = expression->string;
      while ((end = strchr(start, ',')) != NULL) {
        if (value_len == end - start &&
            !strncmp(start, shape->values[itemindex], end - start))
          return MS_TRUE;
        start = end + 1;
      }
      if (!strcmp(start, shape->values[itemindex]))
        return MS_TRUE;
    }
    break;
  case (MS_EXPRESSION): {
    int status;
    parseObj p;

    p.shape = shape;
    p.expr = expression;
    p.expr->curtoken = p.expr->tokens; /* reset */
    p.type = MS_PARSE_TYPE_BOOLEAN;

    status = yyparse(&p);

    if (status != 0) {
      msSetError(MS_PARSEERR, "Failed to parse expression: %s",
                 "msEvalExpression", expression->string);
      return MS_FALSE;
    }

    return p.result.intval;
  }
  case (MS_REGEX):
    if (itemindex == -1) {
      msSetError(MS_MISCERR,
                 "Cannot evaluate expression, no item index defined.",
                 "msEvalExpression()");
      return MS_FALSE;
    }
    if (itemindex >= layer->numitems || itemindex >= shape->numvalues) {
      msSetError(MS_MISCERR, "Invalid item index.", "msEvalExpression()");
      return MS_FALSE;
    }

    if (MS_STRING_IS_NULL_OR_EMPTY(shape->values[itemindex]) == MS_TRUE)
      return MS_FALSE;

    if (!expression->compiled) {
      if (expression->flags & MS_EXP_INSENSITIVE) {
        if (ms_regcomp(&(expression->regex), expression->string,
                       MS_REG_EXTENDED | MS_REG_NOSUB | MS_REG_ICASE) !=
            0) { /* compile the expression */
          msSetError(MS_REGEXERR, "Invalid regular expression.",
                     "msEvalExpression()");
          return MS_FALSE;
        }
      } else {
        if (ms_regcomp(&(expression->regex), expression->string,
                       MS_REG_EXTENDED | MS_REG_NOSUB) !=
            0) { /* compile the expression */
          msSetError(MS_REGEXERR, "Invalid regular expression.",
                     "msEvalExpression()");
          return MS_FALSE;
        }
      }
      expression->compiled = MS_TRUE;
    }

    if (ms_regexec(&(expression->regex), shape->values[itemindex], 0, NULL,
                   0) == 0)
      return MS_TRUE; /* got a match */
    break;
  }

  return MS_FALSE;
}

int *msAllocateValidClassGroups(layerObj *lp, int *nclasses) {
  int *classgroup = NULL;
  int nvalidclass = 0, i = 0;

  if (!lp || !lp->classgroup || lp->numclasses <= 0 || !nclasses)
    return NULL;

  classgroup = (int *)msSmallMalloc(sizeof(int) * lp->numclasses);
  nvalidclass = 0;
  for (i = 0; i < lp->numclasses; i++) {
    if (lp->class[i] -> group && strcasecmp(lp->class[i] -> group,
                                            lp -> classgroup) == 0) {
      classgroup[nvalidclass] = i;
      nvalidclass++;
    }
  }
  if (nvalidclass > 0) {
    classgroup = (int *)msSmallRealloc(classgroup, sizeof(int) * nvalidclass);
    *nclasses = nvalidclass;
    return classgroup;
  }

  if (classgroup)
    msFree(classgroup);

  return NULL;
}

int msShapeGetClass(layerObj *layer, mapObj *map, shapeObj *shape,
                    int *classgroup, int numclasses) {
  return msShapeGetNextClass(-1, layer, map, shape, classgroup, numclasses);
}

int msShapeGetNextClass(int currentclass, layerObj *layer, mapObj *map,
                        shapeObj *shape, int *classgroup, int numclasses) {
  int i, iclass;

  if (currentclass < 0)
    currentclass = -1;

  if (layer->numclasses > 0) {
    if (classgroup == NULL || numclasses <= 0)
      numclasses = layer->numclasses;

    for (i = currentclass + 1; i < numclasses; i++) {
      if (classgroup)
        iclass = classgroup[i];
      else
        iclass = i;

      if (iclass < 0 || iclass >= layer->numclasses)
        continue; /* this should never happen but just in case */

      if (!msScaleInBounds(map->scaledenom,
                           layer->class[iclass] -> minscaledenom,
                           layer -> class[iclass] -> maxscaledenom)) {
        continue;
      }

      /* verify the minfeaturesize */
      if ((shape->type == MS_SHAPE_LINE || shape->type == MS_SHAPE_POLYGON) &&
          (layer->class[iclass] -> minfeaturesize > 0)) {
        double minfeaturesize =
            Pix2LayerGeoref(map, layer, layer->class[iclass] -> minfeaturesize);
        if (msShapeCheckSize(shape, minfeaturesize) == MS_FALSE)
          continue; /* skip this one, next class */
      }

      if (layer->class[iclass] -> status != MS_DELETE &&
                                      msEvalExpression(
                                          layer, shape,
                                          &(layer->class[iclass] -> expression),
                                          layer->classitemindex) == MS_TRUE) {
        if (layer->class[iclass] -> isfallback && currentclass != -1) {
          // Class is not applicable if it is flagged as fallback (<ElseFilter/>
          // tag in SLD) but other classes have been applied before.
          return -1;
        } else {
          return (iclass);
        }
      }
    }
  }

  return (-1); /* no match */
}

static char *msEvalTextExpressionInternal(expressionObj *expr, shapeObj *shape,
                                          int bJSonEscape) {
  char *result = NULL;

  if (!expr->string)
    return result; /* nothing to do */

  switch (expr->type) {
  case (MS_STRING): {
    char *target = NULL;
    char *pszEscaped;
    tokenListNodeObjPtr node = NULL;
    tokenListNodeObjPtr nextNode = NULL;

    result = msStrdup(expr->string);

    node = expr->tokens;
    if (node) {
      while (node != NULL) {
        nextNode = node->next;
        if (node->token == MS_TOKEN_BINDING_DOUBLE ||
            node->token == MS_TOKEN_BINDING_INTEGER ||
            node->token == MS_TOKEN_BINDING_STRING ||
            node->token == MS_TOKEN_BINDING_TIME) {
          target =
              (char *)msSmallMalloc(strlen(node->tokenval.bindval.item) + 3);
          sprintf(target, "[%s]", node->tokenval.bindval.item);
          if (bJSonEscape)
            pszEscaped =
                msEscapeJSonString(shape->values[node->tokenval.bindval.index]);
          else
            pszEscaped = msStrdup(shape->values[node->tokenval.bindval.index]);
          result = msReplaceSubstring(result, target, pszEscaped);
          msFree(pszEscaped);
          msFree(target);
        }
        node = nextNode;
      }
    }
    if (!strlen(result)) {
      msFree(result);
      result = NULL;
    }
  } break;
  case (MS_EXPRESSION): {
    int status;
    parseObj p;

    p.shape = shape;
    p.expr = expr;
    p.expr->curtoken = p.expr->tokens; /* reset */
    p.type = MS_PARSE_TYPE_STRING;

    status = yyparse(&p);

    if (status != 0) {
      msSetError(MS_PARSEERR, "Failed to process text expression: %s",
                 "msEvalTextExpression", expr->string);
      return NULL;
    }

    result = p.result.strval;
    break;
  }
  default:
    break;
  }
  if (result && !strlen(result)) {
    msFree(result);
    result = NULL;
  }
  return result;
}

char *msEvalTextExpressionJSonEscape(expressionObj *expr, shapeObj *shape) {
  return msEvalTextExpressionInternal(expr, shape, MS_TRUE);
}

char *msEvalTextExpression(expressionObj *expr, shapeObj *shape) {
  return msEvalTextExpressionInternal(expr, shape, MS_FALSE);
}

double msEvalDoubleExpression(expressionObj *expression, shapeObj *shape) {
  double value;
  int status;
  parseObj p;
  p.shape = shape;
  p.expr = expression;
  p.expr->curtoken = p.expr->tokens; /* reset */
  p.type = MS_PARSE_TYPE_STRING;
  status = yyparse(&p);
  if (status != 0) {
    msSetError(MS_PARSEERR, "Failed to parse expression: %s", "bindStyle",
               expression->string);
    value = 0.0;
  } else {
    value = atof(p.result.strval);
    msFree(p.result.strval);
  }
  return value;
}

char *msShapeGetLabelAnnotation(layerObj *layer, shapeObj *shape,
                                labelObj *lbl) {
  assert(shape && lbl);
  if (lbl->text.string) {
    return msEvalTextExpression(&(lbl->text), shape);
  } else if (layer->class[shape->classindex] -> text.string) {
    return msEvalTextExpression(&(layer->class[shape->classindex] -> text),
                                shape);
  } else {
    if (shape->values && layer->labelitemindex >= 0 &&
        shape->values[layer->labelitemindex] &&
        strlen(shape->values[layer->labelitemindex]))
      return msStrdup(shape->values[layer->labelitemindex]);
    else if (shape->text)
      return msStrdup(
          shape->text); /* last resort but common with iniline features */
  }
  return NULL;
}

int msGetLabelStatus(mapObj *map, layerObj *layer, shapeObj *shape,
                     labelObj *lbl) {
  assert(layer && lbl);
  if (!msScaleInBounds(map->scaledenom, lbl->minscaledenom, lbl->maxscaledenom))
    return MS_OFF;
  if (msEvalExpression(layer, shape, &(lbl->expression),
                       layer->labelitemindex) != MS_TRUE)
    return MS_OFF;
  /* TODO: check for minfeaturesize here ? */
  return MS_ON;
}

/* Check if the shape is enough big to be drawn with the
   layer::minfeaturesize setting. The minfeaturesize parameter should be
   the value in geo ref (not in pixel) and should have been multiplied by
   the resolution factor.
 */
int msShapeCheckSize(shapeObj *shape, double minfeaturesize) {
  double dx = (shape->bounds.maxx - shape->bounds.minx);
  double dy = (shape->bounds.maxy - shape->bounds.miny);

  if (pow(minfeaturesize, 2.0) > (pow(dx, 2.0) + pow(dy, 2.0)))
    return MS_FALSE;

  return MS_TRUE;
}

/*
** Adjusts an image size in one direction to fit an extent.
*/
int msAdjustImage(rectObj rect, int *width, int *height) {
  if (*width == -1 && *height == -1) {
    msSetError(MS_MISCERR, "Cannot calculate both image height and width.",
               "msAdjustImage()");
    return (-1);
  }

  if (*width > 0)
    *height =
        MS_NINT((rect.maxy - rect.miny) / ((rect.maxx - rect.minx) / (*width)));
  else
    *width = MS_NINT((rect.maxx - rect.minx) /
                     ((rect.maxy - rect.miny) / (*height)));

  return (0);
}

/*
** Make sure extent fits image window to be created. Returns cellsize of output
*image.
*/
double msAdjustExtent(rectObj *rect, int width, int height) {
  double cellsize, ox, oy;

  if (width == 1 || height == 1)
    return 0;

  cellsize = MS_MAX(MS_CELLSIZE(rect->minx, rect->maxx, width),
                    MS_CELLSIZE(rect->miny, rect->maxy, height));

  if (cellsize <= 0) /* avoid division by zero errors */
    return (0);

  ox = MS_MAX(((width - 1) - (rect->maxx - rect->minx) / cellsize) / 2,
              0); /* these were width-1 and height-1 */
  oy = MS_MAX(((height - 1) - (rect->maxy - rect->miny) / cellsize) / 2, 0);

  rect->minx = rect->minx - ox * cellsize;
  rect->miny = rect->miny - oy * cellsize;
  rect->maxx = rect->maxx + ox * cellsize;
  rect->maxy = rect->maxy + oy * cellsize;

  return (cellsize);
}

/*
** Rect must always contain a portion of bounds. If not, rect is
** shifted to overlap by overlay percent. The dimensions of rect do
** not change but placement relative to bounds can.
*/
int msConstrainExtent(rectObj *bounds, rectObj *rect, double overlay) {
  /* check left edge, and if necessary the right edge of bounds */
  if (rect->maxx <= bounds->minx) {
    const double offset = overlay * (rect->maxx - rect->minx);
    rect->minx += offset; /* shift right */
    rect->maxx += offset;
  } else if (rect->minx >= bounds->maxx) {
    const double offset = overlay * (rect->maxx - rect->minx);
    rect->minx -= offset; /* shift left */
    rect->maxx -= offset;
  }

  /* check top edge, and if necessary the bottom edge of bounds */
  if (rect->maxy <= bounds->miny) {
    const double offset = overlay * (rect->maxy - rect->miny);
    rect->miny -= offset; /* shift down */
    rect->maxy -= offset;
  } else if (rect->miny >= bounds->maxy) {
    const double offset = overlay * (rect->maxy - rect->miny);
    rect->miny += offset; /* shift up */
    rect->maxy += offset;
  }

  return (MS_SUCCESS);
}

/*
** Generic function to save an image to a file.
**
** Note that map may be NULL. If it is set, then it is used for two things:
** - Deal with relative imagepaths (compute absolute path relative to map path)
** - Extract the georeferenced extents and coordinate system
**   of the map for writing out with the image when appropriate
**   (primarily this means via msSaveImageGDAL() to something like GeoTIFF).
**
** The filename is NULL when the image is supposed to be written to stdout.
*/

int msSaveImage(mapObj *map, imageObj *img, const char *filename) {
  int nReturnVal = MS_FAILURE;
  char szPath[MS_MAXPATHLEN];
  struct mstimeval starttime = {0}, endtime = {0};

  if (map && map->debug >= MS_DEBUGLEVEL_TUNING) {
    msGettimeofday(&starttime, NULL);
  }

  if (img) {
    if (MS_DRIVER_GDAL(img->format)) {
      if (map != NULL && filename != NULL)
        nReturnVal = msSaveImageGDAL(
            map, img, msBuildPath(szPath, map->mappath, filename));
      else
        nReturnVal = msSaveImageGDAL(map, img, filename);
    } else

        if (MS_RENDERER_PLUGIN(img->format)) {
      rendererVTableObj *renderer = img->format->vtable;
      FILE *stream = NULL;
      if (filename) {
        if (map)
          stream = fopen(msBuildPath(szPath, map->mappath, filename), "wb");
        else
          stream = fopen(filename, "wb");

        if (!stream) {
          msSetError(MS_IOERR, "Failed to create output file (%s).",
                     "msSaveImage()", (map ? szPath : filename));
          return MS_FAILURE;
        }

      } else {
        if (msIO_needBinaryStdout() == MS_FAILURE)
          return MS_FAILURE;
        stream = stdout;
      }

      if (renderer->supports_pixel_buffer) {
        rasterBufferObj data;
        if (renderer->getRasterBufferHandle(img, &data) != MS_SUCCESS) {
          if (stream != stdout)
            fclose(stream);
          return MS_FAILURE;
        }

        nReturnVal = msSaveRasterBuffer(map, &data, stream, img->format);
      } else {
        nReturnVal = renderer->saveImage(img, map, stream, img->format);
      }
      if (stream != stdout)
        fclose(stream);

    } else if (MS_DRIVER_IMAGEMAP(img->format))
      nReturnVal = msSaveImageIM(img, filename, img->format);
    else
      msSetError(MS_MISCERR, "Unknown image type", "msSaveImage()");
  }

  if (map && map->debug >= MS_DEBUGLEVEL_TUNING) {
    msGettimeofday(&endtime, NULL);
    msDebug("msSaveImage(%s) total time: %.3fs\n",
            (filename ? filename : "stdout"),
            (endtime.tv_sec + endtime.tv_usec / 1.0e6) -
                (starttime.tv_sec + starttime.tv_usec / 1.0e6));
  }

  return nReturnVal;
}

/*
** Generic function to save an image to a byte array.
** - the return value is the pointer to the byte array
** - size_ptr contains the number of bytes returned
** - format: the desired output format
**
** The caller is responsible to free the returned array
** The function returns NULL if the output format is not supported.
*/

unsigned char *msSaveImageBuffer(imageObj *image, int *size_ptr,
                                 outputFormatObj *format) {
  *size_ptr = 0;
  if (MS_RENDERER_PLUGIN(image->format)) {
    rasterBufferObj data;
    rendererVTableObj *renderer = image->format->vtable;
    if (renderer->supports_pixel_buffer) {
      bufferObj buffer;
      msBufferInit(&buffer);
      const int status = renderer->getRasterBufferHandle(image, &data);
      if (MS_UNLIKELY(status == MS_FAILURE)) {
        return NULL;
      }
      msSaveRasterBufferToBuffer(&data, &buffer, format);
      *size_ptr = buffer.size;
      return buffer.data;
      /* don't free the bufferObj as we don't own the bytes anymore */
    } else {
      /* check if the renderer supports native buffer output */
      if (renderer->saveImageBuffer)
        return renderer->saveImageBuffer(image, size_ptr, format);

      msSetError(MS_MISCERR, "Unsupported image type", "msSaveImageBuffer()");
      return NULL;
    }
  }
  msSetError(MS_MISCERR, "Unsupported image type", "msSaveImage()");
  return NULL;
}

/**
 * Generic function to free the imageObj
 */
void msFreeImage(imageObj *image) {
  if (image) {
    if (MS_RENDERER_PLUGIN(image->format)) {
      rendererVTableObj *renderer = image->format->vtable;
      tileCacheObj *next, *cur = image->tilecache;
      while (cur) {
        msFreeImage(cur->image);
        next = cur->next;
        free(cur);
        cur = next;
      }
      image->ntiles = 0;
      renderer->freeImage(image);
    } else if (MS_RENDERER_IMAGEMAP(image->format))
      msFreeImageIM(image);
    else if (MS_RENDERER_RAWDATA(image->format))
      msFree(image->img.raw_16bit);
    else
      msSetError(MS_MISCERR, "Unknown image type", "msFreeImage()");

    if (image->imagepath)
      free(image->imagepath);
    if (image->imageurl)
      free(image->imageurl);

    if (--image->format->refcount < 1)
      msFreeOutputFormat(image->format);

    image->imagepath = NULL;
    image->imageurl = NULL;

    msFree(image->img_mask);
    image->img_mask = NULL;

    msFree(image);
  }
}

/*
** Return an array containing all the layer's index given a group name.
** If nothing is found, NULL is returned. The nCount is initialized
** to the number of elements in the returned array.
** Note : the caller of the function should free the array.
*/
int *msGetLayersIndexByGroup(mapObj *map, char *groupname, int *pnCount) {
  int i;
  int iLayer = 0;
  int *aiIndex;

  if (!groupname || !map || !pnCount) {
    return NULL;
  }

  aiIndex = (int *)msSmallMalloc(sizeof(int) * map->numlayers);

  for (i = 0; i < map->numlayers; i++) {
    if (!GET_LAYER(map, i)->group) /* skip it */
      continue;
    if (strcmp(groupname, GET_LAYER(map, i)->group) == 0) {
      aiIndex[iLayer] = i;
      iLayer++;
    }
  }

  if (iLayer == 0) {
    free(aiIndex);
    aiIndex = NULL;
    *pnCount = 0;
  } else {
    aiIndex = (int *)msSmallRealloc(aiIndex, sizeof(int) * iLayer);
    *pnCount = iLayer;
  }

  return aiIndex;
}

/* ==================================================================== */
/*      Measured shape utility functions.                               */
/* ==================================================================== */

/************************************************************************/
/*        pointObj *msGetPointUsingMeasure(shapeObj *shape, double m)   */
/*                                                                      */
/*      Using a measured value get the XY location it corresponds        */
/*      to.                                                             */
/*                                                                      */
/************************************************************************/
pointObj *msGetPointUsingMeasure(shapeObj *shape, double m) {
  pointObj *point = NULL;
  int bFound = 0;
  double dfFirstPointX = 0;
  double dfFirstPointY = 0;
  double dfFirstPointM = 0;
  double dfSecondPointX = 0;
  double dfSecondPointY = 0;
  double dfSecondPointM = 0;

  if (shape && shape->numlines > 0) {
    /* -------------------------------------------------------------------- */
    /*      check fir the first value (min) and the last value(max) to      */
    /*      see if the m is contained between these min and max.            */
    /* -------------------------------------------------------------------- */
    const lineObj *lineFirst = &(shape->line[0]);
    const double dfMin = lineFirst->point[0].m;
    const lineObj *lineLast = &(shape->line[shape->numlines - 1]);
    const double dfMax = lineLast->point[lineLast->numpoints - 1].m;

    if (m >= dfMin && m <= dfMax) {
      for (int i = 0; i < shape->numlines; i++) {
        const lineObj *line = &(shape->line[i]);

        for (int j = 0; j < line->numpoints; j++) {
          const double dfCurrentM = line->point[j].m;
          if (dfCurrentM > m) {
            bFound = 1;

            dfSecondPointX = line->point[j].x;
            dfSecondPointY = line->point[j].y;
            dfSecondPointM = line->point[j].m;

            /* --------------------------------------------------------------------
             */
            /*      get the previous node xy values. */
            /* --------------------------------------------------------------------
             */
            if (j > 0) { /* not the first point of the line */
              dfFirstPointX = line->point[j - 1].x;
              dfFirstPointY = line->point[j - 1].y;
              dfFirstPointM = line->point[j - 1].m;
            } else { /* get last point of previous line */
              dfFirstPointX = shape->line[i - 1].point[0].x;
              dfFirstPointY = shape->line[i - 1].point[0].y;
              dfFirstPointM = shape->line[i - 1].point[0].m;
            }
            break;
          }
        }
      }
    }

    if (!bFound)
      return NULL;

    /* -------------------------------------------------------------------- */
    /*      extrapolate the m value to get t he xy coordinate.              */
    /* -------------------------------------------------------------------- */

    double dfFactor = 0;
    if (dfFirstPointM != dfSecondPointM)
      dfFactor = (m - dfFirstPointM) / (dfSecondPointM - dfFirstPointM);

    point = (pointObj *)msSmallMalloc(sizeof(pointObj));

    point->x = dfFirstPointX + (dfFactor * (dfSecondPointX - dfFirstPointX));
    point->y = dfFirstPointY + (dfFactor * (dfSecondPointY - dfFirstPointY));
    point->m = dfFirstPointM + (dfFactor * (dfSecondPointM - dfFirstPointM));

    return point;
  }

  return NULL;
}

/************************************************************************/
/*       IntersectionPointLinepointObj *p, pointObj *a, pointObj *b)    */
/*                                                                      */
/*      Returns a point object corresponding to the intersection of     */
/*      point p and a line formed of 2 points : a and b.                */
/*                                                                      */
/*      Alorith base on :                                               */
/*      http://www.faqs.org/faqs/graphics/algorithms-faq/               */
/*                                                                      */
/*      Subject 1.02:How do I find the distance from a point to a line? */
/*                                                                      */
/*          Let the point be C (Cx,Cy) and the line be AB (Ax,Ay) to (Bx,By).*/
/*          Let P be the point of perpendicular projection of C on AB.  The
 * parameter*/
/*          r, which indicates P's position along AB, is computed by the dot
 * product */
/*          of AC and AB divided by the square of the length of AB:     */
/*                                                                      */
/*          (1)     AC dot AB                                           */
/*              r = ---------                                           */
/*                  ||AB||^2                                            */
/*                                                                      */
/*          r has the following meaning:                                */
/*                                                                      */
/*              r=0      P = A                                          */
/*              r=1      P = B                                          */
/*              r<0      P is on the backward extension of AB           */
/*              r>1      P is on the forward extension of AB            */
/*              0<r<1    P is interior to AB                            */
/*                                                                      */
/*          The length of a line segment in d dimensions, AB is computed by:*/
/*                                                                      */
/*              L = sqrt( (Bx-Ax)^2 + (By-Ay)^2 + ... + (Bd-Ad)^2)      */
/*                                                                      */
/*          so in 2D:                                                   */
/*                                                                      */
/*              L = sqrt( (Bx-Ax)^2 + (By-Ay)^2 )                       */
/*                                                                      */
/*          and the dot product of two vectors in d dimensions, U dot V is
 * computed:*/
/*                                                                      */
/*              D = (Ux * Vx) + (Uy * Vy) + ... + (Ud * Vd)             */
/*                                                                      */
/*          so in 2D:                                                   */
/*                                                                      */
/*              D = (Ux * Vx) + (Uy * Vy)                               */
/*                                                                      */
/*          So (1) expands to:                                          */
/*                                                                      */
/*                  (Cx-Ax)(Bx-Ax) + (Cy-Ay)(By-Ay)                     */
/*              r = -------------------------------                     */
/*                                L^2                                   */
/*                                                                      */
/*          The point P can then be found:                              */
/*                                                                      */
/*              Px = Ax + r(Bx-Ax)                                      */
/*              Py = Ay + r(By-Ay)                                      */
/*                                                                      */
/*          And the distance from A to P = r*L.                         */
/*                                                                      */
/*          Use another parameter s to indicate the location along PC, with the
 */
/*          following meaning:                                          */
/*                 s<0      C is left of AB                             */
/*                 s>0      C is right of AB                            */
/*                 s=0      C is on AB                                  */
/*                                                                      */
/*          Compute s as follows:                                       */
/*                                                                      */
/*                  (Ay-Cy)(Bx-Ax)-(Ax-Cx)(By-Ay)                       */
/*              s = -----------------------------                       */
/*                              L^2                                     */
/*                                                                      */
/*                                                                      */
/*          Then the distance from C to P = |s|*L.                      */
/*                                                                      */
/************************************************************************/
pointObj *msIntersectionPointLine(pointObj *p, pointObj *a, pointObj *b) {
  pointObj *result = NULL;

  if (p && a && b) {
    const double L =
        sqrt(((b->x - a->x) * (b->x - a->x)) + ((b->y - a->y) * (b->y - a->y)));

    double r = 0;
    if (L != 0)
      r = ((p->x - a->x) * (b->x - a->x) + (p->y - a->y) * (b->y - a->y)) /
          (L * L);

    result = (pointObj *)msSmallMalloc(sizeof(pointObj));
    /* -------------------------------------------------------------------- */
    /*      We want to make sure that the point returned is on the line     */
    /*                                                                      */
    /*              r=0      P = A                                          */
    /*              r=1      P = B                                          */
    /*              r<0      P is on the backward extension of AB           */
    /*              r>1      P is on the forward extension of AB            */
    /*                    0<r<1    P is interior to AB                      */
    /* -------------------------------------------------------------------- */
    if (r < 0) {
      result->x = a->x;
      result->y = a->y;
    } else if (r > 1) {
      result->x = b->x;
      result->y = b->y;
    } else {
      result->x = a->x + r * (b->x - a->x);
      result->y = a->y + r * (b->y - a->y);
    }
    result->m = 0;
  }

  return result;
}

/************************************************************************/
/*         pointObj *msGetMeasureUsingPoint(shapeObj *shape, pointObj   */
/*      *point)                                                         */
/*                                                                      */
/*      Calculate the intersection point betwwen the point and the      */
/*      shape and return the Measured value at the intersection.        */
/************************************************************************/
pointObj *msGetMeasureUsingPoint(shapeObj *shape, pointObj *point) {
  pointObj oFirst = {0, 0, 0, 0};
  pointObj oSecond = {0, 0, 0, 0};

  if (shape && point) {
    double dfMinDist = HUGE_VAL;
    for (int i = 0; i < shape->numlines; i++) {
      lineObj line = shape->line[i];
      /* -------------------------------------------------------------------- */
      /*      for each line (2 consecutive lines) get the distance between    */
      /*      the line and the point and determine which line segment is      */
      /*      the closeset to the point.                                      */
      /* -------------------------------------------------------------------- */
      for (int j = 0; j < line.numpoints - 1; j++) {
        const double dfDist =
            msDistancePointToSegment(point, &line.point[j], &line.point[j + 1]);
        if (dfDist < dfMinDist) {
          oFirst.x = line.point[j].x;
          oFirst.y = line.point[j].y;
          oFirst.m = line.point[j].m;

          oSecond.x = line.point[j + 1].x;
          oSecond.y = line.point[j + 1].y;
          oSecond.m = line.point[j + 1].m;

          dfMinDist = dfDist;
        }
      }
    }
    /* -------------------------------------------------------------------- */
    /*      once we have the nearest segment, look for the x,y location     */
    /*      which is the nearest intersection between the line and the      */
    /*      point.                                                          */
    /* -------------------------------------------------------------------- */
    pointObj *poIntersectionPt =
        msIntersectionPointLine(point, &oFirst, &oSecond);
    if (poIntersectionPt) {
      const double dfDistTotal =
          sqrt(((oSecond.x - oFirst.x) * (oSecond.x - oFirst.x)) +
               ((oSecond.y - oFirst.y) * (oSecond.y - oFirst.y)));

      const double dfDistToIntersection =
          sqrt(((poIntersectionPt->x - oFirst.x) *
                (poIntersectionPt->x - oFirst.x)) +
               ((poIntersectionPt->y - oFirst.y) *
                (poIntersectionPt->y - oFirst.y)));

      const double dfFactor = dfDistToIntersection / dfDistTotal;

      poIntersectionPt->m = oFirst.m + (oSecond.m - oFirst.m) * dfFactor;
      return poIntersectionPt;
    }
  }
  return NULL;
}

/* ==================================================================== */
/*   End   Measured shape utility functions.                            */
/* ==================================================================== */

char **msGetAllGroupNames(mapObj *map, int *numTok) {
  char **papszGroups = NULL;

  assert(map);
  *numTok = 0;

  if (!map->layerorder) {
    map->layerorder = (int *)msSmallMalloc(map->numlayers * sizeof(int));

    /*
     * Initiate to default order
     */
    for (int i = 0; i < map->numlayers; i++)
      map->layerorder[i] = i;
  }

  if (map->numlayers > 0) {
    const int nCount = map->numlayers;
    papszGroups = (char **)msSmallMalloc(sizeof(char *) * nCount);

    for (int i = 0; i < nCount; i++)
      papszGroups[i] = NULL;

    for (int i = 0; i < nCount; i++) {
      layerObj *lp;
      lp = (GET_LAYER(map, map->layerorder[i]));

      int bFound = 0;
      if (lp->group && lp->status != MS_DELETE) {
        for (int j = 0; j < *numTok; j++) {
          if (papszGroups[j] && strcmp(lp->group, papszGroups[j]) == 0) {
            bFound = 1;
            break;
          }
        }
        if (!bFound) {
          /* New group... add to the list of groups found */
          papszGroups[(*numTok)] = msStrdup(lp->group);
          (*numTok)++;
        }
      }
    }
  }

  return papszGroups;
}

/************************************************************************/
/*                         msForceTmpFileBase()                         */
/************************************************************************/

static int tmpCount = 0;
static char *ForcedTmpBase = NULL;

void msForceTmpFileBase(const char *new_base) {
  /* -------------------------------------------------------------------- */
  /*      Clear previous setting, if any.                                 */
  /* -------------------------------------------------------------------- */
  if (ForcedTmpBase != NULL) {
    free(ForcedTmpBase);
    ForcedTmpBase = NULL;
  }

  tmpCount = -1;

  if (new_base == NULL)
    return;

  /* -------------------------------------------------------------------- */
  /*      Record new base.                                                */
  /* -------------------------------------------------------------------- */
  ForcedTmpBase = msStrdup(new_base);
  tmpCount = 0;
}

/**********************************************************************
 *                          msTmpFile()
 *
 * Generate a Unique temporary file.
 *
 * Returns char* which must be freed by caller.
 **********************************************************************/
char *msTmpFile(mapObj *map, const char *mappath, const char *tmppath,
                const char *ext) {
  char szPath[MS_MAXPATHLEN];
  const char *fullFname;
  char *tmpFileName; /* big enough for time + pid + ext */
  char *tmpBase = NULL;

  tmpBase = msTmpPath(map, mappath, tmppath);
  tmpFileName = msTmpFilename(ext);

  fullFname = msBuildPath(szPath, tmpBase, tmpFileName);

  free(tmpFileName);
  free(tmpBase);

  if (fullFname)
    return msStrdup(fullFname);

  return NULL;
}

/**********************************************************************
 *                          msTmpPath()
 *
 * Return the temporary path based on the platform.
 *
 * Returns char* which must be freed by caller.
 **********************************************************************/
char *msTmpPath(mapObj *map, const char *mappath, const char *tmppath) {
  char szPath[MS_MAXPATHLEN];
  const char *fullPath;
  const char *tmpBase;
  const char *ms_temppath;
#ifdef _WIN32
  DWORD dwRetVal = 0;
  TCHAR lpTempPathBuffer[MAX_PATH];
#endif

  if (ForcedTmpBase != NULL)
    tmpBase = ForcedTmpBase;
  else if (tmppath != NULL)
    tmpBase = tmppath;
  else if ((ms_temppath = CPLGetConfigOption("MS_TEMPPATH", NULL)) != NULL)
    tmpBase = ms_temppath;
  else if (map && map->web.temppath)
    tmpBase = map->web.temppath;
  else { /* default paths */
#ifndef _WIN32
    tmpBase = "/tmp/";
#else
    dwRetVal = GetTempPath(MAX_PATH,          /* length of the buffer */
                           lpTempPathBuffer); /* buffer for path */
    if (dwRetVal > MAX_PATH || (dwRetVal == 0)) {
      tmpBase = "C:\\";
    } else {
      tmpBase = (char *)lpTempPathBuffer;
    }
#endif
  }

  fullPath = msBuildPath(szPath, mappath, tmpBase);
  return msStrdup(fullPath);
}

/**********************************************************************
 *                          msTmpFilename()
 *
 * Generate a Unique temporary filename.
 *
 * Returns char* which must be freed by caller.
 **********************************************************************/
char *msTmpFilename(const char *ext) {
  char *tmpFname;
  int tmpFnameBufsize;
  char *fullFname;
  char tmpId[128]; /* big enough for time + pid + ext */

  snprintf(tmpId, sizeof(tmpId), "%lx_%x", (long)time(NULL), (int)getpid());

  if (ext == NULL)
    ext = "";
  tmpFnameBufsize = strlen(tmpId) + 10 + strlen(ext) + 1;
  tmpFname = (char *)msSmallMalloc(tmpFnameBufsize);

  msAcquireLock(TLOCK_TMPFILE);
  snprintf(tmpFname, tmpFnameBufsize, "%s_%x.%s", tmpId, tmpCount++, ext);
  msReleaseLock(TLOCK_TMPFILE);

  fullFname = msStrdup(tmpFname);
  free(tmpFname);

  return fullFname;
}

/**
 *  Generic function to Initialize an image object.
 */
imageObj *msImageCreate(int width, int height, outputFormatObj *format,
                        char *imagepath, char *imageurl, double resolution,
                        double defresolution, colorObj *bg) {
  imageObj *image = NULL;
  if (MS_RENDERER_PLUGIN(format)) {

    image = format->vtable->createImage(width, height, format, bg);
    if (image == NULL) {
      msSetError(MS_MEMERR, "Unable to create new image object.",
                 "msImageCreate()");
      return NULL;
    }

    image->format = format;
    format->refcount++;

    image->width = width;
    image->height = height;
    image->imagepath = NULL;
    image->imageurl = NULL;
    image->tilecache = NULL;
    image->ntiles = 0;
    image->resolution = resolution;
    image->resolutionfactor = resolution / defresolution;

    if (imagepath)
      image->imagepath = msStrdup(imagepath);
    if (imageurl)
      image->imageurl = msStrdup(imageurl);
  } else if (MS_RENDERER_RAWDATA(format)) {
    if (format->imagemode != MS_IMAGEMODE_INT16 &&
        format->imagemode != MS_IMAGEMODE_FLOAT32 &&
        format->imagemode != MS_IMAGEMODE_FLOAT64 &&
        format->imagemode != MS_IMAGEMODE_BYTE) {
      msSetError(MS_IMGERR,
                 "Attempt to use illegal imagemode with rawdata renderer.",
                 "msImageCreate()");
      return NULL;
    }

    image = (imageObj *)calloc(1, sizeof(imageObj));
    if (image == NULL) {
      msSetError(MS_MEMERR, "Unable to create new image object.",
                 "msImageCreate()");
      return NULL;
    }

    if (format->imagemode == MS_IMAGEMODE_INT16)
      image->img.raw_16bit = (short *)msSmallCalloc(
          sizeof(short), ((size_t)width) * height * format->bands);
    else if (format->imagemode == MS_IMAGEMODE_FLOAT32)
      image->img.raw_float = (float *)msSmallCalloc(
          sizeof(float), ((size_t)width) * height * format->bands);
    else if (format->imagemode == MS_IMAGEMODE_FLOAT64)
      image->img.raw_double = (double *)msSmallCalloc(
          sizeof(double), ((size_t)width) * height * format->bands);
    else if (format->imagemode == MS_IMAGEMODE_BYTE)
      image->img.raw_byte = (unsigned char *)msSmallCalloc(
          sizeof(unsigned char), ((size_t)width) * height * format->bands);

    if (image->img.raw_16bit == NULL) {
      msFree(image);
      msSetError(MS_IMGERR,
                 "Attempt to allocate raw image failed, out of memory.",
                 "msImageCreate()");
      return NULL;
    }

    image->img_mask = msAllocBitArray(width * height);

    image->format = format;
    format->refcount++;

    image->width = width;
    image->height = height;
    image->imagepath = NULL;
    image->imageurl = NULL;
    image->resolution = resolution;
    image->resolutionfactor = resolution / defresolution;

    if (imagepath)
      image->imagepath = msStrdup(imagepath);
    if (imageurl)
      image->imageurl = msStrdup(imageurl);

    /* initialize to requested nullvalue if there is one */
    const char *nullvalue =
        msGetOutputFormatOption(image->format, "NULLVALUE", NULL);
    if (nullvalue != NULL) {
      int i = image->width * image->height * format->bands;
      if (atof(nullvalue) == 0.0)
        /* nothing to do */;
      else if (format->imagemode == MS_IMAGEMODE_INT16) {
        short nv = atoi(nullvalue);
        for (; i > 0;)
          image->img.raw_16bit[--i] = nv;
      } else if (format->imagemode == MS_IMAGEMODE_FLOAT32) {
        float nv = atof(nullvalue);
        for (; i > 0;)
          image->img.raw_float[--i] = nv;
      } else if (format->imagemode == MS_IMAGEMODE_FLOAT64) {
        double nv = atof(nullvalue);
        for (; i > 0;)
          image->img.raw_double[--i] = nv;
      } else if (format->imagemode == MS_IMAGEMODE_BYTE) {
        unsigned char nv = (unsigned char)atoi(nullvalue);

        memset(image->img.raw_byte, nv, i);
      }
    }
  } else if (MS_RENDERER_IMAGEMAP(format)) {
    image = msImageCreateIM(width, height, format, imagepath, imageurl,
                            resolution, defresolution);
  } else {
    msSetError(MS_MISCERR,
               "Unsupported renderer requested, unable to initialize image.",
               "msImageCreate()");
    return NULL;
  }

  if (!image) {
    msSetError(MS_IMGERR, "Unable to initialize image.", "msImageCreate()");
    return NULL;
  }
  image->refpt.x = image->refpt.y = 0;
  return image;
}

/**
 * Generic function to transform a point.
 *
 */
void msTransformPoint(pointObj *point, rectObj *extent, double cellsize,
                      imageObj *image) {
  double invcellsize;
  /*We should probably have a function defined at all the renders*/
  if (image != NULL && MS_RENDERER_PLUGIN(image->format)) {
    if (image->format->renderer == MS_RENDER_WITH_KML) {
      return;
    }
  }
  invcellsize = 1.0 / cellsize;
  point->x = MS_MAP2IMAGE_X_IC_DBL(point->x, extent->minx, invcellsize);
  point->y = MS_MAP2IMAGE_Y_IC_DBL(point->y, extent->maxy, invcellsize);
}

/*
** Helper functions supplied as part of bug #2868 solution. Consider moving
*these to
** mapprimitive.c for more general use.
*/

/* vector difference */
static pointObj point_diff(const pointObj a, const pointObj b) {
  pointObj retv;
  retv.x = a.x - b.x;
  retv.y = a.y - b.y;
  retv.z = a.z - b.z;
  retv.m = a.m - b.m;
  return retv;
}

/* vector sum */
static pointObj point_sum(const pointObj a, const pointObj b) {
  pointObj retv;
  retv.x = a.x + b.x;
  retv.y = a.y + b.y;
  retv.z = a.z + b.z;
  retv.m = a.m + b.m;
  return retv;
}

/* vector multiply */
static pointObj point_mul(const pointObj a, double b) {
  pointObj retv;
  retv.x = a.x * b;
  retv.y = a.y * b;
  retv.z = a.z * b;
  retv.m = a.m * b;
  return retv;
}

/* vector ??? */
static double point_abs2(const pointObj a) {
  return a.x * a.x + a.y * a.y + a.z * a.z + a.m * a.m;
}

/* vector normal */
static pointObj point_norm(const pointObj a) {
  double lenmul;
  pointObj retv;
  int norm_vector;

  norm_vector = a.x == 0 && a.y == 0;
  norm_vector = norm_vector && a.z == 0 && a.m == 0;

  if (norm_vector)
    return a;

  lenmul =
      1.0 / sqrt(point_abs2(a)); /* this seems to be the costly operation */

  retv.x = a.x * lenmul;
  retv.y = a.y * lenmul;
  retv.z = a.z * lenmul;
  retv.m = a.m * lenmul;

  return retv;
}

/* rotate a vector 90 degrees */
static pointObj point_rotz90(const pointObj a) {
  double nx = -1.0 * a.y, ny = a.x;
  pointObj retv = a;
  retv.x = nx;
  retv.y = ny;
  return retv;
}

/* vector cross product (warning: z and m dimensions are ignored!) */
static double point_cross(const pointObj a, const pointObj b) {
  return a.x * b.y - a.y * b.x;
}

shapeObj *msOffsetCurve(shapeObj *p, double offset) {
  shapeObj *ret;
  int i, j, first, idx, ok = 0;
#if defined USE_GEOS && (GEOS_VERSION_MAJOR > 3 ||                             \
                         (GEOS_VERSION_MAJOR == 3 && GEOS_VERSION_MINOR >= 3))
  ret = msGEOSOffsetCurve(p, offset);
  /* GEOS curve offsetting can fail sometimes, we continue with our own
   implementation if that is the case.*/
  if (ret)
    return ret;
  /* clear error raised by geos in this case */
  msResetErrorList();
#endif
  /*
  ** For offset corner point calculation 1/sin() is used
  ** to avoid 1/0 division (and long spikes) we define a
  ** limit for sin().
  */
#define CURVE_SIN_LIMIT 0.3
  ret = (shapeObj *)msSmallMalloc(sizeof(shapeObj));
  msInitShape(ret);
  ret->numlines = p->numlines;
  ret->line = (lineObj *)msSmallMalloc(sizeof(lineObj) * ret->numlines);
  for (i = 0; i < ret->numlines; i++) {
    ret->line[i].numpoints = p->line[i].numpoints;
    ret->line[i].point =
        (pointObj *)msSmallMalloc(sizeof(pointObj) * ret->line[i].numpoints);
  }
  for (i = 0; i < p->numlines; i++) {
    pointObj old_diffdir, old_offdir;
    if (p->line[i].numpoints < 2) {
      ret->line[i].numpoints = 0;
      continue; /* skip degenerate points */
    }
    ok = 1;
    /* initialize old_offdir and old_diffdir, as gcc isn't smart enough to see
     * that it is not an error to do so, and prints a warning */
    old_offdir.x = old_offdir.y = old_diffdir.x = old_diffdir.y = 0;

    idx = 0;
    first = 1;

    /* saved metrics of the last processed point */
    pointObj old_pt = p->line[i].point[0];
    for (j = 1; j < p->line[i].numpoints; j++) {
      const pointObj pt = p->line[i].point[j]; /* place of the point */
      const pointObj diffdir =
          point_norm(point_diff(pt, old_pt)); /* direction of the line */
      const pointObj offdir =
          point_rotz90(diffdir); /* direction where the distance between the
                                    line and the offset is measured */
      pointObj offpt; /* this will be the corner point of the offset line */

      /* offset line points computation */
      if (first == 1) { /* first point */
        first = 0;
        offpt = point_sum(old_pt, point_mul(offdir, offset));
      } else { /* middle points */
        /* curve is the angle of the last and the current line's direction
         * (supplementary angle of the shape's inner angle) */
        double sin_curve = point_cross(diffdir, old_diffdir);
        double cos_curve = point_cross(old_offdir, diffdir);
        if ((-1.0) * CURVE_SIN_LIMIT < sin_curve &&
            sin_curve < CURVE_SIN_LIMIT) {
          /* do not calculate 1/sin, instead use a corner point approximation:
           * average of the last and current offset direction and length */

          /*
          ** TODO: fair for obtuse inner angles, however, positive and negative
          ** acute inner angles would need special handling - similar to LINECAP
          ** to avoid drawing of long spikes
          */
          offpt = point_sum(
              old_pt, point_mul(point_sum(offdir, old_offdir), 0.5 * offset));
        } else {
          double base_shift = -1.0 * (1.0 + cos_curve) / sin_curve;
          offpt = point_sum(
              old_pt,
              point_mul(point_sum(point_mul(diffdir, base_shift), offdir),
                        offset));
        }
      }
      ret->line[i].point[idx] = offpt;
      idx++;
      old_pt = pt;
      old_diffdir = diffdir;
      old_offdir = offdir;
    }

    /* last point */
    if (first == 0) {
      pointObj offpt = point_sum(old_pt, point_mul(old_offdir, offset));
      ret->line[i].point[idx] = offpt;
      idx++;
    }

    if (idx != p->line[i].numpoints) {
      /* printf("shouldn't happen :(\n"); */
      ret->line[i].numpoints = idx;
      ret->line =
          msSmallRealloc(ret->line, ret->line[i].numpoints * sizeof(pointObj));
    }
  }
  if (!ok)
    ret->numlines = 0; /* all lines where degenerate */
  return ret;
}

shapeObj *msOffsetPolyline(shapeObj *p, double offsetx, double offsety) {
  int i, j;
  shapeObj *ret;
  if (offsety == MS_STYLE_SINGLE_SIDED_OFFSET) { /* complex calculations */
    return msOffsetCurve(p, offsetx);
  } else if (offsety == MS_STYLE_DOUBLE_SIDED_OFFSET) {
    shapeObj *tmp1;
    ret = msOffsetCurve(p, offsetx / 2.0);
    tmp1 = msOffsetCurve(p, -offsetx / 2.0);
    for (i = 0; i < tmp1->numlines; i++) {
      msAddLineDirectly(ret, tmp1->line + i);
    }
    msFreeShape(tmp1);
    free(tmp1);
    return ret;
  }

  ret = (shapeObj *)msSmallMalloc(sizeof(shapeObj));
  msInitShape(ret);
  ret->numlines = p->numlines;
  ret->line = (lineObj *)msSmallMalloc(sizeof(lineObj) * ret->numlines);
  for (i = 0; i < ret->numlines; i++) {
    ret->line[i].numpoints = p->line[i].numpoints;
    ret->line[i].point =
        (pointObj *)msSmallMalloc(sizeof(pointObj) * ret->line[i].numpoints);
  }

  for (i = 0; i < p->numlines; i++) {
    for (j = 0; j < p->line[i].numpoints; j++) {
      ret->line[i].point[j].x = p->line[i].point[j].x + offsetx;
      ret->line[i].point[j].y = p->line[i].point[j].y + offsety;
    }
  }

  return ret;
}

/*
-------------------------------------------------------------------------------
 msSetup()

 Contributed by Jerry Pisk in bug 1203.  Heads off potential race condition
 in initializing GD font cache with multiple threads.  Should be called from
 mapscript module initialization code.
-------------------------------------------------------------------------------
*/

int msSetup() {
#ifdef _WIN32
  const char *maxfiles = CPLGetConfigOption("MS_MAX_OPEN_FILES", NULL);
  if (maxfiles) {
    int res = _getmaxstdio();
    if (res < 2048) {
      res = _setmaxstdio(atoi(maxfiles));
      assert(res != -1);
    }
  }
#endif

#ifdef USE_THREAD
  msThreadInit();
#endif

  if (gdal_destroyed) {
    msAcquireLock(TLOCK_GDAL);
    GDALAllRegister();
    gdal_destroyed = 0;
    msReleaseLock(TLOCK_GDAL);
  }

  /* Use PROJ_DATA/PROJ_LIB env vars if set */
  msProjDataInitFromEnv();

  /* Use MS_ERRORFILE and MS_DEBUGLEVEL env vars if set */
  if (msDebugInitFromEnv() != MS_SUCCESS)
    return MS_FAILURE;

#ifdef USE_GEOS
  msGEOSSetup();
#endif

#ifdef USE_RSVG
#if !GLIB_CHECK_VERSION(2, 35, 0)
  g_type_init();
#endif
#endif

  msFontCacheSetup();

  return MS_SUCCESS;
}

/* This is intended to be a function to cleanup anything that "hangs around"
   when all maps are destroyed, like Registered GDAL drivers, and so forth. */
#ifndef NDEBUG
#if defined(USE_LIBXML2)
#include "maplibxml2.h"
#endif
#endif
void msCleanup() {
  msForceTmpFileBase(NULL);
  msConnPoolFinalCleanup();
  /* Lexer string parsing variable */
  if (msyystring_buffer != NULL) {
    msFree(msyystring_buffer);
    msyystring_buffer = NULL;
  }
  msyylex_destroy();

  msOGRCleanup();
  msGDALCleanup();

  /* Release both GDAL and OGR resources */
  msAcquireLock(TLOCK_GDAL);
  /* Cleanup some GDAL global resources in particular */
  GDALDestroy();
  gdal_destroyed = 1;
  msReleaseLock(TLOCK_GDAL);

  msSetPROJ_DATA(NULL, NULL);
  msProjectionContextPoolCleanup();

#if defined(USE_CURL)
  msHTTPCleanup();
#endif

#ifdef USE_GEOS
  msGEOSCleanup();
#endif

/* make valgrind happy on debug code */
#ifndef NDEBUG
#ifdef USE_CAIRO
  msCairoCleanup();
#endif
#if defined(USE_LIBXML2)
  xmlCleanupParser();
#endif
#endif

  msFontCacheCleanup();

  msTimeCleanup();

  msIO_Cleanup();

  msResetErrorList();

  /* Close/cleanup log/debug output. Keep this at the very end. */
  msDebugCleanup();

  /* Clean up the vtable factory */
  msPluginFreeVirtualTableFactory();
}

/************************************************************************/
/*                            msAlphaBlend()                            */
/*                                                                      */
/*      Function to overlay/blend an RGBA value into an existing        */
/*      RGBA value using the Porter-Duff "over" operator.               */
/*      Primarily intended for use with rasterBufferObj                 */
/*      raster rendering.  The "src" is the overlay value, and "dst"    */
/*      is the existing value being overlaid. dst is expected to be     */
/*      premultiplied, but the source should not be.                    */
/*                                                                      */
/*      NOTE: alpha_dst may be NULL.                                    */
/************************************************************************/

void msAlphaBlend(unsigned char red_src, unsigned char green_src,
                  unsigned char blue_src, unsigned char alpha_src,
                  unsigned char *red_dst, unsigned char *green_dst,
                  unsigned char *blue_dst, unsigned char *alpha_dst) {
  /* -------------------------------------------------------------------- */
  /*      Simple cases we want to handle fast.                            */
  /* -------------------------------------------------------------------- */
  if (alpha_src == 0)
    return;

  if (alpha_src == 255) {
    *red_dst = red_src;
    *green_dst = green_src;
    *blue_dst = blue_src;
    if (alpha_dst)
      *alpha_dst = 255;
    return;
  }

  /* -------------------------------------------------------------------- */
  /*      Premultiple alpha for source values now.                        */
  /* -------------------------------------------------------------------- */
  red_src = red_src * alpha_src / 255;
  green_src = green_src * alpha_src / 255;
  blue_src = blue_src * alpha_src / 255;

  /* -------------------------------------------------------------------- */
  /*      Another pretty fast case if there is nothing in the             */
  /*      destination to mix with.                                        */
  /* -------------------------------------------------------------------- */
  if (alpha_dst && *alpha_dst == 0) {
    *red_dst = red_src;
    *green_dst = green_src;
    *blue_dst = blue_src;
    *alpha_dst = alpha_src;
    return;
  }

  /* -------------------------------------------------------------------- */
  /*      Cases with actual blending.                                     */
  /* -------------------------------------------------------------------- */
  if (!alpha_dst || *alpha_dst == 255) {
    int weight_dst = 256 - alpha_src;

    *red_dst = (256 * red_src + *red_dst * weight_dst) >> 8;
    *green_dst = (256 * green_src + *green_dst * weight_dst) >> 8;
    *blue_dst = (256 * blue_src + *blue_dst * weight_dst) >> 8;
  } else {
    int weight_dst = (256 - alpha_src);

    *red_dst = (256 * red_src + *red_dst * weight_dst) >> 8;
    *green_dst = (256 * green_src + *green_dst * weight_dst) >> 8;
    *blue_dst = (256 * blue_src + *blue_dst * weight_dst) >> 8;

    *alpha_dst = (256 * alpha_src + *alpha_dst * weight_dst) >> 8;
  }
}

/************************************************************************/
/*                           msAlphaBlendPM()                           */
/*                                                                      */
/*      Same as msAlphaBlend() except that the source RGBA is           */
/*      assumed to already be premultiplied.                            */
/************************************************************************/

void msAlphaBlendPM(unsigned char red_src, unsigned char green_src,
                    unsigned char blue_src, unsigned char alpha_src,
                    unsigned char *red_dst, unsigned char *green_dst,
                    unsigned char *blue_dst, unsigned char *alpha_dst) {
  /* -------------------------------------------------------------------- */
  /*      Simple cases we want to handle fast.                            */
  /* -------------------------------------------------------------------- */
  if (alpha_src == 0)
    return;

  if (alpha_src == 255) {
    *red_dst = red_src;
    *green_dst = green_src;
    *blue_dst = blue_src;
    if (alpha_dst)
      *alpha_dst = 255;
    return;
  }

  /* -------------------------------------------------------------------- */
  /*      Another pretty fast case if there is nothing in the             */
  /*      destination to mix with.                                        */
  /* -------------------------------------------------------------------- */
  if (alpha_dst && *alpha_dst == 0) {
    *red_dst = red_src;
    *green_dst = green_src;
    *blue_dst = blue_src;
    *alpha_dst = alpha_src;
    return;
  }

  /* -------------------------------------------------------------------- */
  /*      Cases with actual blending.                                     */
  /* -------------------------------------------------------------------- */
  if (!alpha_dst || *alpha_dst == 255) {
    int weight_dst = 255 - alpha_src;

    *red_dst = (alpha_src * red_src + *red_dst * weight_dst) >> 8;
    *green_dst = (alpha_src * green_src + *green_dst * weight_dst) >> 8;
    *blue_dst = (alpha_src * blue_src + *blue_dst * weight_dst) >> 8;
  } else {
    int weight_dst = (255 - alpha_src);

    *red_dst = (alpha_src * red_src + *red_dst * weight_dst) >> 8;
    *green_dst = (alpha_src * green_src + *green_dst * weight_dst) >> 8;
    *blue_dst = (alpha_src * blue_src + *blue_dst * weight_dst) >> 8;

    *alpha_dst = (255 * alpha_src + *alpha_dst * weight_dst) >> 8;
  }
}

void msRGBtoHSL(colorObj *rgb, double *h, double *s, double *l) {
  double r = rgb->red / 255.0, g = rgb->green / 255.0, b = rgb->blue / 255.0;
  double maxv = MS_MAX(MS_MAX(r, g), b), minv = MS_MIN(MS_MIN(r, g), b);
  double d = maxv - minv;

  *h = 0, *s = 0;
  *l = (maxv + minv) / 2;

  if (maxv != minv) {
    *s = *l > 0.5 ? d / (2 - maxv - minv) : d / (maxv + minv);
    if (maxv == r) {
      *h = (g - b) / d + (g < b ? 6 : 0);
    } else if (maxv == g) {
      *h = (b - r) / d + 2;
    } else if (maxv == b) {
      *h = (r - g) / d + 4;
    }
    *h /= 6;
  }
}

static double hue_to_rgb(double p, double q, double t) {
  if (t < 0)
    t += 1;
  if (t > 1)
    t -= 1;
  if (t < 0.1666666666666666)
    return p + (q - p) * 6 * t;
  if (t < 0.5)
    return q;
  if (t < 0.6666666666666666)
    return p + (q - p) * (0.666666666666 - t) * 6;
  return p;
}

void msHSLtoRGB(double h, double s, double l, colorObj *rgb) {
  double r, g, b;

  if (s == 0) {
    r = g = b = l;
  } else {

    double q = l < 0.5 ? l * (1 + s) : l + s - l * s;
    double p = 2 * l - q;
    r = hue_to_rgb(p, q, h + 0.33333333333333333);
    g = hue_to_rgb(p, q, h);
    b = hue_to_rgb(p, q, h - 0.33333333333333333);
  }
  rgb->red = r * 255;
  rgb->green = g * 255;
  rgb->blue = b * 255;
}

/*
 RFC 24: check if the parent pointer is NULL and raise an error otherwise
*/
int msCheckParentPointer(void *p, const char *objname) {
  if (p == NULL) {
    if (objname != NULL) {
      msSetError(MS_NULLPARENTERR, "The %s parent object is null",
                 "msCheckParentPointer()", objname);
    } else {
      msSetError(MS_NULLPARENTERR, "The parent object is null",
                 "msCheckParentPointer()");
    }
    return MS_FAILURE;
  }
  return MS_SUCCESS;
}

void msBufferInit(bufferObj *buffer) {
  buffer->data = NULL;
  buffer->size = 0;
  buffer->available = 0;
  buffer->_next_allocation_size = MS_DEFAULT_BUFFER_ALLOC;
}

void msBufferResize(bufferObj *buffer, size_t target_size) {
  while (buffer->available <= target_size) {
    buffer->data = msSmallRealloc(
        buffer->data, buffer->available + buffer->_next_allocation_size);
    buffer->available += buffer->_next_allocation_size;
    buffer->_next_allocation_size *= 2;
  }
}

void msBufferAppend(bufferObj *buffer, void *data, size_t length) {
  if (buffer->available < buffer->size + length) {
    msBufferResize(buffer, buffer->size + length);
  }
  memcpy(&(buffer->data[buffer->size]), data, length);
  buffer->size += length;
}

void msBufferFree(bufferObj *buffer) {
  if (buffer->available > 0)
    free(buffer->data);
}

void msFreeRasterBuffer(rasterBufferObj *b) {
  switch (b->type) {
  case MS_BUFFER_BYTE_RGBA:
    msFree(b->data.rgba.pixels);
    b->data.rgba.pixels = NULL;
    break;
  case MS_BUFFER_BYTE_PALETTE:
    msFree(b->data.palette.pixels);
    msFree(b->data.palette.palette);
    b->data.palette.pixels = NULL;
    b->data.palette.palette = NULL;
    break;
  }
}

/*
** Issue #3043: Layer extent comparison short circuit.
**
** msExtentsOverlap()
**
** Returns MS_TRUE if map extent and layer extent overlap,
** MS_FALSE if they are disjoint, and MS_UNKNOWN if there is
** not enough info to calculate a deterministic answer.
**
*/
int msExtentsOverlap(mapObj *map, layerObj *layer) {
  rectObj map_extent;
  rectObj layer_extent;

  /* No extent info? Nothing we can do, return MS_UNKNOWN. */
  if ((map->extent.minx == -1) && (map->extent.miny == -1) &&
      (map->extent.maxx == -1) && (map->extent.maxy == -1))
    return MS_UNKNOWN;
  if ((layer->extent.minx == -1) && (layer->extent.miny == -1) &&
      (layer->extent.maxx == -1) && (layer->extent.maxy == -1))
    return MS_UNKNOWN;

  /* No map projection? Let someone else sort this out. */
  if (!(map->projection.numargs > 0))
    return MS_UNKNOWN;

  /* No layer projection? Perform naive comparison, because they are
  ** in the same projection. */
  if (!(layer->projection.numargs > 0))
    return msRectOverlap(&(map->extent), &(layer->extent));

  /* In the case where map and layer projections are identical, and the */
  /* bounding boxes don't cross the dateline, do simple rectangle comparison */
  if (map->extent.minx < map->extent.maxx &&
      layer->extent.minx < layer->extent.maxx &&
      !msProjectionsDiffer(&(map->projection), &(layer->projection))) {
    return msRectOverlap(&(map->extent), &(layer->extent));
  }

  /* We need to transform our rectangles for comparison,
  ** so we will work with copies and leave the originals intact. */
  MS_COPYRECT(&map_extent, &(map->extent));
  MS_COPYRECT(&layer_extent, &(layer->extent));

  /* Transform map extents into geographics for comparison. */
  if (msProjectRect(&(map->projection), &(map->latlon), &map_extent))
    return MS_UNKNOWN;

  /* Transform layer extents into geographics for comparison. */
  if (msProjectRect(&(layer->projection), &(map->latlon), &layer_extent))
    return MS_UNKNOWN;

  /* Simple case? Return simple answer. */
  if (map_extent.minx < map_extent.maxx &&
      layer_extent.minx < layer_extent.maxx)
    return msRectOverlap(&(map_extent), &(layer_extent));

  /* Uh oh, one of the rects crosses the dateline!
  ** Let someone else handle it. */
  return MS_UNKNOWN;
}

/************************************************************************/
/*                             msSmallMalloc()                          */
/************************************************************************/

/* Safe version of malloc(). This function is taken from gdal/cpl. */

void *msSmallMalloc(size_t nSize) {
  void *pReturn;

  if (MS_UNLIKELY(nSize == 0))
    return NULL;

  pReturn = malloc(nSize);
  if (MS_UNLIKELY(pReturn == NULL)) {
    msIO_fprintf(stderr,
                 "msSmallMalloc(): Out of memory allocating %ld bytes.\n",
                 (long)nSize);
    exit(1);
  }

  return pReturn;
}

/************************************************************************/
/*                             msSmallRealloc()                         */
/************************************************************************/

/* Safe version of realloc(). This function is taken from gdal/cpl. */

void *msSmallRealloc(void *pData, size_t nNewSize) {
  void *pReturn;

  if (MS_UNLIKELY(nNewSize == 0))
    return NULL;

  pReturn = realloc(pData, nNewSize);

  if (MS_UNLIKELY(pReturn == NULL)) {
    msIO_fprintf(stderr,
                 "msSmallRealloc(): Out of memory allocating %ld bytes.\n",
                 (long)nNewSize);
    exit(1);
  }

  return pReturn;
}

/************************************************************************/
/*                             msSmallCalloc()                         */
/************************************************************************/

/* Safe version of calloc(). This function is taken from gdal/cpl. */

void *msSmallCalloc(size_t nCount, size_t nSize) {
  void *pReturn;

  if (MS_UNLIKELY(nSize * nCount == 0))
    return NULL;

  pReturn = calloc(nCount, nSize);
  if (MS_UNLIKELY(pReturn == NULL)) {
    msIO_fprintf(stderr,
                 "msSmallCalloc(): Out of memory allocating %ld bytes.\n",
                 (long)(nCount * nSize));
    exit(1);
  }

  return pReturn;
}

/*
** msBuildOnlineResource()
**
** Try to build the online resource (mapserv URL) for this service.
** "http://$(SERVER_NAME):$(SERVER_PORT)$(SCRIPT_NAME)$(PATH_INFO)?"
** (+append the map=... param if it was explicitly passed in QUERY_STRING)
**
** Returns a newly allocated string that should be freed by the caller or
** NULL in case of error.
*/
char *msBuildOnlineResource(const mapObj *map, const cgiRequestObj *req) {
  (void)map; // unused parameter

  const char *pathinfo = getenv("PATH_INFO");
  if (!pathinfo) {
    pathinfo = "";
  }

  /* If map=.. was explicitly set then we'll include it in onlineresource
   */

  const char *mapparam = NULL;
  if (req->type == MS_GET_REQUEST) {
    int i;
    for (i = 0; i < req->NumParams; i++) {
      if (strcasecmp(req->ParamNames[i], "map") == 0) {
        mapparam = req->ParamValues[i];
        break;
      }
    }
  }

  // check if MS_ONLINERESOURCE has been set in the
  // CONFIG file
  const char *config_online_resource =
      CPLGetConfigOption("MS_ONLINERESOURCE", NULL);

  if (config_online_resource) {

    // append the PATH_INFO to the MS_ONLINERESOURCE value and return it
    const char *path = pathinfo;
    size_t config_len = strlen(config_online_resource);

    /* avoid double slash */
    if (config_len > 0 && config_online_resource[config_len - 1] == '/' &&
        pathinfo[0] == '/') {
      path = pathinfo + 1;
    }

    size_t path_len = strlen(path);
    size_t map_len = 0;

    if (mapparam) {
      map_len = strlen(mapparam) + 5; /* "map=" + "&" */
    }

    // add 2 to buffer_size for '?' and '\0'
    size_t buffer_size = config_len + path_len + map_len + 2;

    char *result = (char *)msSmallMalloc(buffer_size);
    if (!result) {
      msSetError(MS_MEMERR, "Memory allocation failed",
                 "msBuildOnlineResource()");
      return NULL;
    }

    if (mapparam) {
      snprintf(result, buffer_size, "%s%s?map=%s&", config_online_resource,
               path, mapparam);
    } else {
      snprintf(result, buffer_size, "%s%s?", config_online_resource, path);
    }

    return result;
  }

  char *online_resource = NULL;
  const char *value, *protocol = "http";
  char **hostname_array = NULL;
  int mapparam_len = 0, hostname_array_len = 0;
  const char *hostname = getenv("HTTP_X_FORWARDED_HOST");
  if (!hostname)
    hostname = getenv("SERVER_NAME");
  else {
    if (strchr(hostname, ',')) {
      hostname_array = msStringSplit(hostname, ',', &hostname_array_len);
      hostname = hostname_array[0];
    }
  }

  const char *port = getenv("HTTP_X_FORWARDED_PORT");
  if (!port)
    port = getenv("SERVER_PORT");

  const char *script = getenv("SCRIPT_NAME");

  /* HTTPS is set by Apache to "on" in an HTTPS server ... if not set */
  /* then check SERVER_PORT: 443 is the default https port. */
  if (((value = getenv("HTTPS")) && strcasecmp(value, "on") == 0) ||
      ((value = getenv("SERVER_PORT")) && atoi(value) == 443)) {
    protocol = "https";
  }
  if ((value = getenv("HTTP_X_FORWARDED_PROTO"))) {
    protocol = value;
  }

  if (hostname && port && script) {
    size_t buffer_size;
    buffer_size = strlen(hostname) + strlen(port) + strlen(pathinfo) +
                  strlen(script) + mapparam_len +
                  11; /* 11 comes from
                         https://[host]:[port][scriptname][pathinfo]?[map]\0,
                         i.e. "https://:?\0" */
    online_resource = (char *)msSmallMalloc(buffer_size);
    if ((atoi(port) == 80 && strcmp(protocol, "http") == 0) ||
        (atoi(port) == 443 && strcmp(protocol, "https") == 0))
      snprintf(online_resource, buffer_size, "%s://%s%s%s?", protocol, hostname,
               script, pathinfo);
    else
      snprintf(online_resource, buffer_size, "%s://%s:%s%s%s?", protocol,
               hostname, port, script, pathinfo);

    if (mapparam) {
      int baselen;
      baselen = strlen(online_resource);
      snprintf(online_resource + baselen, buffer_size - baselen, "map=%s&",
               mapparam);
    }
  } else {
    msSetError(MS_CGIERR, "Impossible to establish server URL.",
               "msBuildOnlineResource()");
    return NULL;
  }
  if (hostname_array) {
    msFreeCharArray(hostname_array, hostname_array_len);
  }

  return online_resource;
}

/************************************************************************/
/*                             msIntegerInArray()                        */
/************************************************************************/

/* Check if a integer is in a array */
int msIntegerInArray(const int value, int *array, int numelements) {
  int i;
  for (i = 0; i < numelements; ++i) {
    if (value == array[i])
      return MS_TRUE;
  }
  return MS_FALSE;
}

/************************************************************************
 *                            msMapSetProjections                       *
 *                                                                      *
 *   Ensure that all the layers in the map file have a projection       *
 *   by copying the map-level projection to all layers than have no     *
 *   projection.                                                        *
 ************************************************************************/

int msMapSetLayerProjections(mapObj *map) {

  char *mapProjStr = NULL;
  int i;

  if (map->projection.numargs <= 0) {
    msSetError(MS_WMSERR,
               "Cannot set new SRS on a map that doesn't "
               "have any projection set. Please make sure your mapfile "
               "has a PROJECTION defined at the top level.",
               "msTileSetProjectionst()");
    return (MS_FAILURE);
  }

  for (i = 0; i < map->numlayers; i++) {
    layerObj *lp = GET_LAYER(map, i);
    /* This layer is turned on and needs a projection? */
    if (lp->projection.numargs <= 0 && lp->status != MS_OFF &&
        lp->transform == MS_TRUE) {

      /* Fetch main map projection string only now that we need it */
      if (mapProjStr == NULL)
        mapProjStr = msGetProjectionString(&(map->projection));

      /* Set the projection to the map file projection */
      if (msLoadProjectionString(&(lp->projection), mapProjStr) != 0) {
        msSetError(MS_CGIERR, "Unable to set projection on layer.",
                   "msMapSetLayerProjections()");
        return (MS_FAILURE);
      }
      lp->project = MS_TRUE;
      if (lp->connection &&
          IS_THIRDPARTY_LAYER_CONNECTIONTYPE(lp->connectiontype)) {
        char **reflayers;
        int numreflayers, j;
        reflayers = msStringSplit(lp->connection, ',', &numreflayers);
        for (j = 0; j < numreflayers; j++) {
          int *lidx, nlidx;
          /* first check layers referenced by group name */
          lidx = msGetLayersIndexByGroup(map, reflayers[i], &nlidx);
          if (lidx) {
            int k;
            for (k = 0; k < nlidx; k++) {
              layerObj *glp = GET_LAYER(map, lidx[k]);
              if (glp->projection.numargs <= 0 && glp->transform == MS_TRUE) {

                /* Set the projection to the map file projection */
                if (msLoadProjectionString(&(glp->projection), mapProjStr) !=
                    0) {
                  msSetError(MS_CGIERR, "Unable to set projection on layer.",
                             "msMapSetLayerProjections()");
                  return (MS_FAILURE);
                }
                glp->project = MS_TRUE;
              }
            }
            free(lidx);
          } else {
            /* group name did not match, check by layer name */
            int layer_idx = msGetLayerIndex(map, lp->connection);
            layerObj *glp = GET_LAYER(map, layer_idx);
            if (glp->projection.numargs <= 0 && glp->transform == MS_TRUE) {

              /* Set the projection to the map file projection */
              if (msLoadProjectionString(&(glp->projection), mapProjStr) != 0) {
                msSetError(MS_CGIERR, "Unable to set projection on layer.",
                           "msMapSetLayerProjections()");
                return (MS_FAILURE);
              }
              glp->project = MS_TRUE;
            }
          }
        }
        msFreeCharArray(reflayers, numreflayers);
      }
    }
  }
  msFree(mapProjStr);
  return (MS_SUCCESS);
}

/************************************************************************
 *                    msMapSetLanguageSpecificConnection                *
 *                                                                      *
 *   Override DATA and CONNECTION of each layer with their specific     *
 *  variant for the specified language.                                 *
 ************************************************************************/

void msMapSetLanguageSpecificConnection(mapObj *map,
                                        const char *validated_language) {
  int i;
  for (i = 0; i < map->numlayers; i++) {
    layerObj *layer = GET_LAYER(map, i);
    if (layer->data)
      layer->data =
          msCaseReplaceSubstring(layer->data, "%language%", validated_language);
    if (layer->connection)
      layer->connection = msCaseReplaceSubstring(
          layer->connection, "%language%", validated_language);
  }
}

/* Generalize a shape based of the tolerance.
   Ref: http://trac.osgeo.org/gdal/ticket/966 */
shapeObj *msGeneralize(shapeObj *shape, double tolerance) {
  lineObj newLine = {0, NULL};
  const double sqTolerance = tolerance * tolerance;

  shapeObj *newShape = (shapeObj *)msSmallMalloc(sizeof(shapeObj));
  msInitShape(newShape);
  msCopyShape(shape, newShape);

  if (shape->numlines < 1)
    return newShape;

  /* Clean shape */
  for (int i = 0; i < newShape->numlines; i++)
    free(newShape->line[i].point);
  newShape->numlines = 0;
  if (newShape->line)
    free(newShape->line);

  msAddLine(newShape, &newLine);

  if (shape->line[0].numpoints == 0) {
    return newShape;
  }

  msAddPointToLine(&newShape->line[0], &shape->line[0].point[0]);
  double dX0 = shape->line[0].point[0].x;
  double dY0 = shape->line[0].point[0].y;

  for (int i = 1; i < shape->line[0].numpoints; i++) {
    double dX1 = shape->line[0].point[i].x;
    double dY1 = shape->line[0].point[i].y;

    const double dX = dX1 - dX0;
    const double dY = dY1 - dY0;
    const double dSqDist = dX * dX + dY * dY;
    if (i == shape->line[0].numpoints - 1 || dSqDist >= sqTolerance) {
      pointObj p;
      p.x = dX1;
      p.y = dY1;

      /* Keep this point (always keep the last point) */
      msAddPointToLine(&newShape->line[0], &p);
      dX0 = dX1;
      dY0 = dY1;
    }
  }

  return newShape;
}

void msSetLayerOpacity(layerObj *layer, int opacity) {
  if (!layer->compositer) {
    layer->compositer = msSmallMalloc(sizeof(LayerCompositer));
    initLayerCompositer(layer->compositer);
  }
  layer->compositer->opacity = opacity;
}

void msReplaceFreeableStr(char **ppszStr, char *pszNewStr) {
  msFree(*ppszStr);
  *ppszStr = pszNewStr;
}

MapServer / MapServer / 24030044940

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