fontlist.c

   1 /*
   2  * fontlist.c
   3  * Copyright (C) 1998-2002 A.J. van Os; Released under GPL
   4  *
   5  * Description:
   6  * Build, read and destroy a list of Word font information
   7  */
   8
   9 #include <stdlib.h>
  10 #include <stddef.h>
  11 #include "antiword.h"
  12
  13
  14 /* Variables needed to write the Font Information List */
  15 static font_desc_type   *pAnchor = NULL;
  16 static font_desc_type   *pFontLast = NULL;
  17
  18
  19 /*
  20  * vDestroyFontInfoList - destroy the Font Information List
  21  */
  22 void
  23 vDestroyFontInfoList(void)
  24 {
  25         font_desc_type  *pCurr, *pNext;
  26
  27         DBG_MSG("vDestroyFontInfoList");
  28
  29         /* Free the Font Information List */
  30         pCurr = pAnchor;
  31         while (pCurr != NULL) {
  32                 pNext = pCurr->pNext;
  33                 pCurr = xfree(pCurr);
  34                 pCurr = pNext;
  35         }
  36         pAnchor = NULL;
  37         /* Reset all control variables */
  38         pFontLast = NULL;
  39 } /* end of vDestroyFontInfoList */
  40
  41 /*
  42  * vCorrectFontValues - correct font values to values Antiword can use
  43  */
  44 void
  45 vCorrectFontValues(font_block_type *pFontBlock)
  46 {
  47         UINT    uiRealSize;
  48         USHORT  usRealStyle;
  49
  50         uiRealSize = pFontBlock->usFontSize;
  51         usRealStyle = pFontBlock->usFontStyle;
  52         if (bIsSmallCapitals(pFontBlock->usFontStyle)) {
  53                 /* Small capitals become normal capitals in a smaller font */
  54                 uiRealSize = (uiRealSize * 4 + 2) / 5;
  55                 usRealStyle &= ~FONT_SMALL_CAPITALS;
  56                 usRealStyle |= FONT_CAPITALS;
  57         }
  58         if (bIsSuperscript(pFontBlock->usFontStyle) ||
  59             bIsSubscript(pFontBlock->usFontStyle)) {
  60                 /* Superscript and subscript use a smaller fontsize */
  61                 uiRealSize = (uiRealSize * 2 + 1) / 3;
  62         }
  63
  64         if (uiRealSize < MIN_FONT_SIZE) {
  65                 DBG_DEC(uiRealSize);
  66                 uiRealSize = MIN_FONT_SIZE;
  67         } else if (uiRealSize > MAX_FONT_SIZE) {
  68                 DBG_DEC(uiRealSize);
  69                 uiRealSize = MAX_FONT_SIZE;
  70         }
  71
  72         pFontBlock->usFontSize = (USHORT)uiRealSize;
  73         if (pFontBlock->ucFontColor == 8) {
  74                 /* White text to light gray text */
  75                 pFontBlock->ucFontColor = 16;
  76         }
  77         pFontBlock->usFontStyle = usRealStyle;
  78 } /* end of vCorrectFontValues */
  79
  80 /*
  81  * vAdd2FontInfoList - Add an element to the Font Information List
  82  */
  83 void
  84 vAdd2FontInfoList(const font_block_type *pFontBlock)
  85 {
  86         font_desc_type  *pListMember;
  87
  88         fail(pFontBlock == NULL);
  89
  90         NO_DBG_MSG("bAdd2FontInfoList");
  91
  92         if (pFontBlock->ulFileOffset == FC_INVALID) {
  93                 /*
  94                  * This offset is really past the end of the file,
  95                  * so don't waste any memory by storing it.
  96                  */
  97                 return;
  98         }
  99
 100         NO_DBG_HEX(pFontBlock->ulFileOffset);
 101         NO_DBG_DEC_C(pFontBlock->ucFontNumber != 0,
 102                                         pFontBlock->ucFontNumber);
 103         NO_DBG_DEC_C(pFontBlock->usFontSize != DEFAULT_FONT_SIZE,
 104                                         pFontBlock->usFontSize);
 105         NO_DBG_DEC_C(pFontBlock->ucFontColor != 0,
 106                                         pFontBlock->ucFontColor);
 107         NO_DBG_HEX_C(pFontBlock->usFontStyle != 0x00,
 108                                         pFontBlock->usFontStyle);
 109
 110         if (pFontLast != NULL &&
 111             pFontLast->tInfo.ulFileOffset == pFontBlock->ulFileOffset) {
 112                 /*
 113                  * If two consecutive fonts share the same
 114                  * offset, remember only the last font
 115                  */
 116                 fail(pFontLast->pNext != NULL);
 117                 pFontLast->tInfo = *pFontBlock;
 118                 return;
 119         }
 120
 121         /* Create list member */
 122         pListMember = xmalloc(sizeof(font_desc_type));
 123         /* Fill the list member */
 124         pListMember->tInfo = *pFontBlock;
 125         pListMember->pNext = NULL;
 126         /* Correct the values where needed */
 127         vCorrectFontValues(&pListMember->tInfo);
 128         /* Add the new member to the list */
 129         if (pAnchor == NULL) {
 130                 pAnchor = pListMember;
 131         } else {
 132                 fail(pFontLast == NULL);
 133                 pFontLast->pNext = pListMember;
 134         }
 135         pFontLast = pListMember;
 136 } /* end of vAdd2FontInfoList */
 137
 138 /*
 139  * Get the record that follows the given recored in the Font Information List
 140  */
 141 const font_block_type *
 142 pGetNextFontInfoListItem(const font_block_type *pCurr)
 143 {
 144         const font_desc_type    *pRecord;
 145         size_t  tOffset;
 146
 147         if (pCurr == NULL) {
 148                 if (pAnchor == NULL) {
 149                         /* There are no records */
 150                         return NULL;
 151                 }
 152                 /* The first record is the only one without a predecessor */
 153                 return &pAnchor->tInfo;
 154         }
 155         tOffset = offsetof(font_desc_type, tInfo);
 156         /* Many casts to prevent alignment warnings */
 157         pRecord = (font_desc_type *)(void *)((char *)pCurr - tOffset);
 158         fail(pCurr != &pRecord->tInfo);
 159         if (pRecord->pNext == NULL) {
 160                 /* The last record has no successor */
 161                 return NULL;
 162         }
 163         return &pRecord->pNext->tInfo;
 164 } /* end of pGetNextFontInfoListItem */