propmod.c

   1 /*
   2  * propmod.c
   3  * Copyright (C) 2001-2003 A.J. van Os; Released under GPL
   4  *
   5  * Description:
   6  * Build, read and destroy a list (array) of Word property modifiers
   7  */
   8
   9 #include <stdio.h>
  10 #include <string.h>
  11 #include "antiword.h"
  12
  13 #if defined(DEBUG)
  14 #define ELEMENTS_TO_ADD  3
  15 #else
  16 #define ELEMENTS_TO_ADD 30
  17 #endif /* DEBUG */
  18
  19 /* Variables needed to write the property modifier list */
  20 static UCHAR    **ppAnchor = NULL;
  21 static size_t   tNextFree = 0;
  22 static size_t   tMaxElements = 0;
  23
  24
  25 /*
  26  * vDestroyPropModList - destroy the property modifier list
  27  */
  28 void
  29 vDestroyPropModList(void)
  30 {
  31         size_t  tIndex;
  32
  33         DBG_MSG("vDestroyPropModList");
  34
  35         /* Free all the elements of the list */
  36         for (tIndex = 0; tIndex < tNextFree; tIndex++) {
  37                 ppAnchor[tIndex] = xfree(ppAnchor[tIndex]);
  38         }
  39         /* Free the list itself */
  40         ppAnchor = xfree(ppAnchor);
  41         /* Reset all control variables */
  42         tNextFree = 0;
  43         tMaxElements = 0;
  44 } /* end of vDestroyPropModList */
  45
  46 /*
  47  * vAdd2PropModList - add an element to the property modifier list
  48  */
  49 void
  50 vAdd2PropModList(const UCHAR *aucPropMod)
  51 {
  52         size_t  tSize, tLen;
  53
  54         fail(aucPropMod == NULL);
  55
  56         NO_DBG_MSG("vAdd2PropModList");
  57
  58         if (tNextFree >= tMaxElements) {
  59                 tMaxElements += ELEMENTS_TO_ADD;
  60                 tSize = tMaxElements * sizeof(UCHAR **);
  61                 ppAnchor = xrealloc(ppAnchor, tSize);
  62         }
  63         NO_DBG_DEC(tNextFree);
  64
  65         tLen = 2 + (size_t)usGetWord(0, aucPropMod);
  66         NO_DBG_HEX(tLen);
  67         NO_DBG_PRINT_BLOCK(pucPropMod, tLen);
  68         ppAnchor[tNextFree] = xmalloc(tLen);
  69         memcpy(ppAnchor[tNextFree], aucPropMod, tLen);
  70         tNextFree++;
  71 } /* end of vAdd2PropModList */
  72
  73 /*
  74  * aucReadPropModListItem - get an item of the property modifier list
  75  */
  76 const UCHAR *
  77 aucReadPropModListItem(USHORT usPropMod)
  78 {
  79         static UCHAR    aucBuffer[4];
  80         size_t  tIndex;
  81
  82         if (usPropMod == IGNORE_PROPMOD) {
  83                 /* This Properties Modifier must be ignored */
  84                 return NULL;
  85         }
  86
  87         if (!odd(usPropMod)) {
  88                 /* Variant 1: The information is in the input ifself */
  89                 aucBuffer[0] = 2;
  90                 aucBuffer[1] = 0;
  91                 aucBuffer[2] = (UCHAR)((usPropMod & 0x00fe) >> 1);
  92                 aucBuffer[3] = (UCHAR)((usPropMod & 0xff00) >> 8);
  93                 return aucBuffer;
  94         }
  95
  96         if (ppAnchor == NULL) {
  97                 /* No information available */
  98                 return NULL;
  99         }
 100
 101         /* Variant 2: The input contains an index */
 102         tIndex = (size_t)(usPropMod >> 1);
 103         if (tIndex >= tNextFree) {
 104                 DBG_HEX(usPropMod);
 105                 DBG_DEC(tIndex);
 106                 DBG_DEC(tNextFree);
 107                 return NULL;
 108         }
 109         return ppAnchor[tIndex];
 110 } /* end of aucGetPropModListItem */