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/*
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* finddata.c
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* Copyright (C) 2000-2002 A.J. van Os; Released under GPL
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*
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* Description:
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* Find the blocks that contain the data of MS Word files
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "antiword.h"
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/*
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* bAddDataBlocks - Add the blocks to the data 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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bAddDataBlocks(ULONG ulDataPosFirst, ULONG ulTotalLength,
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ULONG ulStartBlock, const ULONG *aulBBD, size_t tBBDLen)
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{
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data_block_type tDataBlock;
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ULONG ulDataPos, ulOffset, ulIndex;
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long lToGo;
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BOOL bSuccess;
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fail(ulTotalLength > (ULONG)LONG_MAX);
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fail(ulStartBlock > MAX_BLOCKNUMBER && ulStartBlock != END_OF_CHAIN);
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fail(aulBBD == NULL);
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NO_DBG_HEX(ulDataPosFirst);
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NO_DBG_DEC(ulTotalLength);
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lToGo = (long)ulTotalLength;
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ulDataPos = ulDataPosFirst;
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ulOffset = ulDataPosFirst;
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for (ulIndex = ulStartBlock;
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ulIndex != END_OF_CHAIN && lToGo > 0;
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ulIndex = aulBBD[ulIndex]) {
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if (ulIndex == UNUSED_BLOCK || ulIndex >= (ULONG)tBBDLen) {
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DBG_DEC(ulIndex);
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DBG_DEC(tBBDLen);
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return FALSE;
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}
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if (ulOffset >= BIG_BLOCK_SIZE) {
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ulOffset -= BIG_BLOCK_SIZE;
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continue;
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}
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tDataBlock.ulFileOffset =
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(ulIndex + 1) * BIG_BLOCK_SIZE + ulOffset;
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tDataBlock.ulDataPos = ulDataPos;
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tDataBlock.ulLength = min(BIG_BLOCK_SIZE - ulOffset,
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(ULONG)lToGo);
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fail(tDataBlock.ulLength > BIG_BLOCK_SIZE);
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ulOffset = 0;
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if (!bAdd2DataBlockList(&tDataBlock)) {
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DBG_HEX(tDataBlock.ulFileOffset);
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DBG_HEX(tDataBlock.ulDataPos);
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DBG_DEC(tDataBlock.ulLength);
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return FALSE;
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}
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ulDataPos += tDataBlock.ulLength;
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lToGo -= (long)tDataBlock.ulLength;
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}
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bSuccess = lToGo == 0 ||
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(ulTotalLength == (ULONG)LONG_MAX && ulIndex == END_OF_CHAIN);
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DBG_DEC_C(!bSuccess, lToGo);
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DBG_DEC_C(!bSuccess, ulTotalLength);
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DBG_DEC_C(!bSuccess, ulIndex);
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return bSuccess;
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} /* end of bAddDataBlocks */
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/*
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* bGet6DocumentData - make a list of the data blocks of Word 6/7 files
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*
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* Code for "fast saved" files.
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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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bGet6DocumentData(FILE *pFile, ULONG ulStartBlock,
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const ULONG *aulBBD, size_t tBBDLen, const UCHAR *aucHeader)
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{
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UCHAR *aucBuffer;
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ULONG ulBeginTextInfo, ulOffset, ulTotLength;
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size_t tTextInfoLen;
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int iIndex, iOff, iType, iLen, iPieces;
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DBG_MSG("bGet6DocumentData");
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fail(pFile == NULL);
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fail(aulBBD == NULL);
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fail(aucHeader == NULL);
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ulBeginTextInfo = ulGetLong(0x160, aucHeader);
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DBG_HEX(ulBeginTextInfo);
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tTextInfoLen = (size_t)ulGetLong(0x164, aucHeader);
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DBG_DEC(tTextInfoLen);
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aucBuffer = xmalloc(tTextInfoLen);
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if (!bReadBuffer(pFile, ulStartBlock,
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aulBBD, tBBDLen, BIG_BLOCK_SIZE,
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aucBuffer, ulBeginTextInfo, tTextInfoLen)) {
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aucBuffer = xfree(aucBuffer);
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return FALSE;
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}
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NO_DBG_PRINT_BLOCK(aucBuffer, tTextInfoLen);
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iOff = 0;
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while (iOff < (int)tTextInfoLen) {
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iType = (int)ucGetByte(iOff, aucBuffer);
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iOff++;
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if (iType == 0) {
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iOff++;
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continue;
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}
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iLen = (int)usGetWord(iOff, aucBuffer);
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iOff += 2;
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if (iType == 1) {
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iOff += iLen;
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continue;
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}
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if (iType != 2) {
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werr(0, "Unknown type of 'fastsaved' format");
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aucBuffer = xfree(aucBuffer);
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return FALSE;
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}
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/* Type 2 */
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NO_DBG_DEC(iLen);
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iOff += 2;
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iPieces = (iLen - 4) / 12;
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DBG_DEC(iPieces);
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for (iIndex = 0; iIndex < iPieces; iIndex++) {
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ulOffset = ulGetLong(
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iOff + (iPieces + 1) * 4 + iIndex * 8 + 2,
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aucBuffer);
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ulTotLength = ulGetLong(iOff + (iIndex + 1) * 4,
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aucBuffer) -
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ulGetLong(iOff + iIndex * 4,
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aucBuffer);
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if (!bAddDataBlocks(ulOffset, ulTotLength,
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ulStartBlock,
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aulBBD, tBBDLen)) {
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aucBuffer = xfree(aucBuffer);
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return FALSE;
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}
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}
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break;
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}
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aucBuffer = xfree(aucBuffer);
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return TRUE;
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} /* end of bGet6DocumentData */
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