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