1 /*
2 * worddos.c
3 * Copyright (C) 2002-2005 A.J. van Os; Released under GNU GPL
4 *
5 * Description:
6 * Deal with the DOS internals of a MS Word file
7 */
8
9 #include "antiword.h"
10
11
12 /*
13 * bGetDocumentText - make a list of the text blocks of a Word document
14 *
15 * Return TRUE when succesful, otherwise FALSE
16 */
17 static BOOL
bGetDocumentText(FILE * pFile,long lFilesize,const UCHAR * aucHeader)18 bGetDocumentText(FILE *pFile, long lFilesize, const UCHAR *aucHeader)
19 {
20 text_block_type tTextBlock;
21 ULONG ulTextLen;
22 BOOL bFastSaved;
23 UCHAR ucDocStatus, ucVersion;
24
25 fail(pFile == NULL);
26 fail(lFilesize < 128);
27 fail(aucHeader == NULL);
28
29 /* Get the status flags from the header */
30 ucDocStatus = ucGetByte(0x75, aucHeader);
31 DBG_HEX(ucDocStatus);
32 bFastSaved = (ucDocStatus & BIT(1)) != 0;
33 DBG_MSG_C(bFastSaved, "This document is Fast Saved");
34 ucVersion = ucGetByte(0x74, aucHeader);
35 DBG_DEC(ucVersion);
36 DBG_MSG_C(ucVersion == 0, "Written by Word 4.0 or earlier");
37 DBG_MSG_C(ucVersion == 3, "Word 5.0 format, but not written by Word");
38 DBG_MSG_C(ucVersion == 4, "Written by Word 5.x");
39 if (bFastSaved) {
40 werr(0, "Word for DOS: autosave documents are not supported");
41 return FALSE;
42 }
43
44 /* Get length information */
45 ulTextLen = ulGetLong(0x0e, aucHeader);
46 DBG_HEX(ulTextLen);
47 ulTextLen -= 128;
48 DBG_DEC(ulTextLen);
49 tTextBlock.ulFileOffset = 128;
50 tTextBlock.ulCharPos = 128;
51 tTextBlock.ulLength = ulTextLen;
52 tTextBlock.bUsesUnicode = FALSE;
53 tTextBlock.usPropMod = IGNORE_PROPMOD;
54 if (!bAdd2TextBlockList(&tTextBlock)) {
55 DBG_HEX(tTextBlock.ulFileOffset);
56 DBG_HEX(tTextBlock.ulCharPos);
57 DBG_DEC(tTextBlock.ulLength);
58 DBG_DEC(tTextBlock.bUsesUnicode);
59 DBG_DEC(tTextBlock.usPropMod);
60 return FALSE;
61 }
62 return TRUE;
63 } /* end of bGetDocumentText */
64
65 /*
66 * iInitDocumentDOS - initialize an DOS document
67 *
68 * Returns the version of Word that made the document or -1
69 */
70 int
iInitDocumentDOS(FILE * pFile,long lFilesize)71 iInitDocumentDOS(FILE *pFile, long lFilesize)
72 {
73 int iWordVersion;
74 BOOL bSuccess;
75 USHORT usIdent;
76 UCHAR aucHeader[128];
77
78 fail(pFile == NULL);
79
80 if (lFilesize < 128) {
81 return -1;
82 }
83
84 /* Read the headerblock */
85 if (!bReadBytes(aucHeader, 128, 0x00, pFile)) {
86 return -1;
87 }
88 /* Get the "magic number" from the header */
89 usIdent = usGetWord(0x00, aucHeader);
90 DBG_HEX(usIdent);
91 fail(usIdent != 0xbe31); /* Word for DOS */
92 iWordVersion = iGetVersionNumber(aucHeader);
93 if (iWordVersion != 0) {
94 werr(0, "This file is not from 'Word for DOS'.");
95 return -1;
96 }
97 bSuccess = bGetDocumentText(pFile, lFilesize, aucHeader);
98 if (bSuccess) {
99 vGetPropertyInfo(pFile, NULL,
100 NULL, 0, NULL, 0,
101 aucHeader, iWordVersion);
102 vSetDefaultTabWidth(pFile, NULL,
103 NULL, 0, NULL, 0,
104 aucHeader, iWordVersion);
105 vGetNotesInfo(pFile, NULL,
106 NULL, 0, NULL, 0,
107 aucHeader, iWordVersion);
108 }
109 return bSuccess ? iWordVersion : -1;
110 } /* end of iInitDocumentDOS */
111