pictlist.c

   1 /*
   2  * pictlist.c
   3  * Copyright (C) 2000,2001 A.J. van Os; Released under GPL
   4  *
   5  * Description:
   6  * Build, read and destroy a list of Word picture information
   7  */
   8
   9 #include <stdlib.h>
  10 #include "antiword.h"
  11
  12
  13 /* Variables needed to write the Picture Information List */
  14 static picture_desc_type        *pAnchor = NULL;
  15 static picture_desc_type        *pPictureLast = NULL;
  16
  17
  18 /*
  19  * vDestroyPictInfoList - destroy the Picture Information List
  20  */
  21 void
  22 vDestroyPictInfoList(void)
  23 {
  24         picture_desc_type       *pCurr, *pNext;
  25
  26         DBG_MSG("vDestroyPictInfoList");
  27
  28         /* Free the Picture Information List */
  29         pCurr = pAnchor;
  30         while (pCurr != NULL) {
  31                 pNext = pCurr->pNext;
  32                 pCurr = xfree(pCurr);
  33                 pCurr = pNext;
  34         }
  35         pAnchor = NULL;
  36         /* Reset all control variables */
  37         pPictureLast = NULL;
  38 } /* end of vDestroyPictInfoList */
  39
  40 /*
  41  * vAdd2PictInfoList - Add an element to the Picture Information List
  42  */
  43 void
  44 vAdd2PictInfoList(const picture_block_type *pPictureBlock)
  45 {
  46         picture_desc_type       *pListMember;
  47
  48         fail(pPictureBlock == NULL);
  49
  50         NO_DBG_MSG("bAdd2PictInfoList");
  51
  52         if (pPictureBlock->ulFileOffset == FC_INVALID) {
  53                 /*
  54                  * This offset is really past the end of the file,
  55                  * so don't waste any memory by storing it.
  56                  */
  57                 return;
  58         }
  59         if (pPictureBlock->ulFileOffsetPicture == FC_INVALID) {
  60                 /*
  61                  * The place where this picture is supposed to be stored
  62                  * doesn't exist.
  63                  */
  64                 return;
  65         }
  66
  67         NO_DBG_HEX(pPictureBlock->ulFileOffset);
  68         NO_DBG_HEX(pPictureBlock->ulFileOffsetPicture);
  69         NO_DBG_HEX(pPictureBlock->ulPictureOffset);
  70
  71         /* Create list member */
  72         pListMember = xmalloc(sizeof(picture_desc_type));
  73         /* Fill the list member */
  74         pListMember->tInfo = *pPictureBlock;
  75         pListMember->pNext = NULL;
  76         /* Add the new member to the list */
  77         if (pAnchor == NULL) {
  78                 pAnchor = pListMember;
  79         } else {
  80                 fail(pPictureLast == NULL);
  81                 pPictureLast->pNext = pListMember;
  82         }
  83         pPictureLast = pListMember;
  84 } /* end of vAdd2PictInfoList */
  85
  86 /*
  87  * Get the info with the given file offset from the Picture Information List
  88  */
  89 ULONG
  90 ulGetPictInfoListItem(ULONG ulFileOffset)
  91 {
  92         picture_desc_type       *pCurr;
  93
  94         for (pCurr = pAnchor; pCurr != NULL; pCurr = pCurr->pNext) {
  95                 if (pCurr->tInfo.ulFileOffset == ulFileOffset) {
  96                         return pCurr->tInfo.ulFileOffsetPicture;
  97                 }
  98         }
  99         return FC_INVALID;
 100 } /* end of ulGetPictInfoListItem */