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/*
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 * propmod.c
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 * Copyright (C) 2001-2003 A.J. van Os; Released under GPL
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 *
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 * Description:
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 * Build, read and destroy a list (array) of Word property modifiers
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 */
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#include <stdio.h>
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#include <string.h>
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#include "antiword.h"
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#if defined(DEBUG)
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#define ELEMENTS_TO_ADD	 3
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#else
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#define ELEMENTS_TO_ADD	30
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#endif /* DEBUG */
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/* Variables needed to write the property modifier list */
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static UCHAR	**ppAnchor = NULL;
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static size_t	tNextFree = 0;
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static size_t	tMaxElements = 0;
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/*
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 * vDestroyPropModList - destroy the property modifier list
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 */
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void
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vDestroyPropModList(void)
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{
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	size_t	tIndex;
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	DBG_MSG("vDestroyPropModList");
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	/* Free all the elements of the list */
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	for (tIndex = 0; tIndex < tNextFree; tIndex++) {
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		ppAnchor[tIndex] = xfree(ppAnchor[tIndex]);
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	}
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	/* Free the list itself */
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	ppAnchor = xfree(ppAnchor);
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	/* Reset all control variables */
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	tNextFree = 0;
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	tMaxElements = 0;
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} /* end of vDestroyPropModList */
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/*
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 * vAdd2PropModList - add an element to the property modifier list
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 */
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void
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vAdd2PropModList(const UCHAR *aucPropMod)
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{
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	size_t	tSize, tLen;
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	fail(aucPropMod == NULL);
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	NO_DBG_MSG("vAdd2PropModList");
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	if (tNextFree >= tMaxElements) {
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		tMaxElements += ELEMENTS_TO_ADD;
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		tSize = tMaxElements * sizeof(UCHAR **);
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		ppAnchor = xrealloc(ppAnchor, tSize);
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	}
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	NO_DBG_DEC(tNextFree);
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	tLen = 2 + (size_t)usGetWord(0, aucPropMod);
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	NO_DBG_HEX(tLen);
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	NO_DBG_PRINT_BLOCK(pucPropMod, tLen);
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	ppAnchor[tNextFree] = xmalloc(tLen);
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	memcpy(ppAnchor[tNextFree], aucPropMod, tLen);
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	tNextFree++;
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} /* end of vAdd2PropModList */
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/*
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 * aucReadPropModListItem - get an item of the property modifier list
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 */
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const UCHAR *
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aucReadPropModListItem(USHORT usPropMod)
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{
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	static UCHAR	aucBuffer[4];
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	size_t	tIndex;
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	if (usPropMod == IGNORE_PROPMOD) {
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		/* This Properties Modifier must be ignored */
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		return NULL;
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	}
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	if (!odd(usPropMod)) {
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		/* Variant 1: The information is in the input ifself */
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		aucBuffer[0] = 2;
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		aucBuffer[1] = 0;
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		aucBuffer[2] = (UCHAR)((usPropMod & 0x00fe) >> 1);
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		aucBuffer[3] = (UCHAR)((usPropMod & 0xff00) >> 8);
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		return aucBuffer;
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	}
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	if (ppAnchor == NULL) {
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		/* No information available */
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		return NULL;
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	}
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	/* Variant 2: The input contains an index */
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	tIndex = (size_t)(usPropMod >> 1);
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	if (tIndex >= tNextFree) {
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		DBG_HEX(usPropMod);
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		DBG_DEC(tIndex);
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		DBG_DEC(tNextFree);
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		return NULL;
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	}
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	return ppAnchor[tIndex];
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} /* end of aucGetPropModListItem */