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/*
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* depot.c
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* Copyright (C) 1998-2002 A.J. van Os; Released under GPL
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*
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* Description:
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* Functions to compute the depot offset
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*/
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#include "antiword.h"
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#define SIZE_RATIO (BIG_BLOCK_SIZE/SMALL_BLOCK_SIZE)
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static ULONG *aulSmallBlockList = NULL;
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static size_t tSmallBlockListLen = 0;
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/*
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* vDestroySmallBlockList - destroy the small block list
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*/
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void
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vDestroySmallBlockList(void)
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{
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DBG_MSG("vDestroySmallBlockList");
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aulSmallBlockList = xfree(aulSmallBlockList);
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tSmallBlockListLen = 0;
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} /* end of vDestroySmalBlockList */
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/*
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* vCreateSmallBlockList - create the small block list
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*
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* returns: TRUE when successful, otherwise FALSE
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*/
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BOOL
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bCreateSmallBlockList(ULONG ulStartblock, const ULONG *aulBBD, size_t tBBDLen)
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{
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ULONG ulTmp;
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size_t tSize;
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int iIndex;
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fail(aulSmallBlockList != NULL);
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fail(tSmallBlockListLen != 0);
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fail(ulStartblock > MAX_BLOCKNUMBER && ulStartblock != END_OF_CHAIN);
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fail(aulBBD == NULL);
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fail(tBBDLen == 0);
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/* Find the length of the small block list */
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for (tSmallBlockListLen = 0, ulTmp = ulStartblock;
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tSmallBlockListLen < tBBDLen && ulTmp != END_OF_CHAIN;
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tSmallBlockListLen++, ulTmp = aulBBD[ulTmp]) {
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if (ulTmp >= (ULONG)tBBDLen) {
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DBG_DEC(ulTmp);
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DBG_DEC(tBBDLen);
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werr(1, "The Big Block Depot is damaged");
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}
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}
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DBG_DEC(tSmallBlockListLen);
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if (tSmallBlockListLen == 0) {
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/* There is no small block list */
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fail(ulStartblock != END_OF_CHAIN);
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aulSmallBlockList = NULL;
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return TRUE;
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}
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/* Create the small block list */
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tSize = tSmallBlockListLen * sizeof(ULONG);
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aulSmallBlockList = xmalloc(tSize);
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for (iIndex = 0, ulTmp = ulStartblock;
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iIndex < (int)tBBDLen && ulTmp != END_OF_CHAIN;
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iIndex++, ulTmp = aulBBD[ulTmp]) {
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if (ulTmp >= (ULONG)tBBDLen) {
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DBG_DEC(ulTmp);
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DBG_DEC(tBBDLen);
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werr(1, "The Big Block Depot is damaged");
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}
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aulSmallBlockList[iIndex] = ulTmp;
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NO_DBG_DEC(aulSmallBlockList[iIndex]);
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}
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return TRUE;
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} /* end of bCreateSmallBlockList */
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/*
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* ulDepotOffset - get the depot offset the block list
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*/
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ULONG
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ulDepotOffset(ULONG ulIndex, size_t tBlockSize)
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{
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ULONG ulTmp;
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size_t tTmp;
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fail(ulIndex >= ULONG_MAX / BIG_BLOCK_SIZE);
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switch (tBlockSize) {
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case BIG_BLOCK_SIZE:
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return (ulIndex + 1) * BIG_BLOCK_SIZE;
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case SMALL_BLOCK_SIZE:
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tTmp = (size_t)(ulIndex / SIZE_RATIO);
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ulTmp = ulIndex % SIZE_RATIO;
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if (aulSmallBlockList == NULL ||
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tTmp >= tSmallBlockListLen) {
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DBG_HEX(aulSmallBlockList);
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DBG_DEC(tSmallBlockListLen);
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DBG_DEC(tTmp);
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return 0;
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}
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return ((aulSmallBlockList[tTmp] + 1) * SIZE_RATIO +
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ulTmp) * SMALL_BLOCK_SIZE;
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default:
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DBG_DEC(tBlockSize);
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DBG_FIXME();
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return 0;
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}
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} /* end of ulDepotOffset */
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