1 /////////////////////////////////////////////////////////////////////////////
2 // Name: readshg.cpp
3 // Purpose: Petr Smilauer's .SHG (Segmented Hypergraphics file) reading
4 // code.
5 // Note: .SHG is undocumented (anywhere!) so this is
6 // reverse-engineering
7 // and guesswork at its best.
8 // Author: Petr Smilauer
9 // Modified by: Wlodzimiez ABX Skiba 2003/2004 Unicode support
10 // Ron Lee
11 // Created: 01/01/99
12 // RCS-ID: $Id: readshg.cpp 35650 2005-09-23 12:56:45Z MR $
13 // Copyright: (c) Petr Smilauer
14 // Licence: wxWindows licence
15 /////////////////////////////////////////////////////////////////////////////
16
17 // For compilers that support precompilation, includes "wx.h".
18 #include "wx/wxprec.h"
19
20 #ifdef __BORLANDC__
21 #pragma hdrstop
22 #endif
23
24 #ifndef WX_PRECOMP
25 #endif
26
27 #include <stdio.h>
28 #include <stdlib.h>
29
30 #include "readshg.h"
31 #include "tex2any.h"
32
33 // Returns the number of hotspots, and the array of hotspots.
34 // E.g.
35 // HotSpots *array;
36 // int n = ParseSHG("thing.shg", &array);
37
ParseSHG(const wxChar * fileName,HotSpot ** hotspots)38 int ParseSHG( const wxChar* fileName, HotSpot **hotspots)
39 { FILE* fSHG = wxFopen( fileName, _T("rb"));
40 long offset;
41 int nHotspots = 0;
42
43 if(fSHG == 0)
44 return 0;
45 nHotspots = 0;
46 //first, look at offset OFF_OFFSET to get another offset :-)
47 fseek( fSHG, OFF_OFFSET, SEEK_SET);
48 offset = 0L; // init whole 4-byte variable
49 fread( &offset, 2, 1, fSHG); // get the offset in first two bytes..
50 if(offset == 0) // if zero, used next DWORD field
51 fread( &offset, 4, 1, fSHG);// this is our offset for very long DIB
52 offset += 9; // don't know hot this delta comes-about
53 if(fseek( fSHG, offset, SEEK_SET) != 0)
54 {
55 fclose( fSHG);
56 return -1; // this is probably because incorrect offset calculation.
57 }
58 fread( &nHotspots, 2, 1, fSHG);
59
60 *hotspots = new HotSpot[nHotspots];
61
62 int nMacroStrings = 0;
63
64 fread( &nMacroStrings, 2, 1, fSHG); // we can ignore the macros, as this is
65 // repeated later, but we need to know how much to skip
66 fseek( fSHG, 2, SEEK_CUR); // skip another 2 bytes I do not understand ;-)
67
68 ShgInfoBlock sib;
69 int i;
70
71 int sizeOf = sizeof( ShgInfoBlock);
72
73 for( i = 0 ; i < nHotspots ; ++i)
74 {
75 fread( &sib, sizeOf, 1, fSHG); // read one hotspot' info
76 // analyse it:
77 (*hotspots)[i].type = (HotspotType)(sib.hotspotType & 0xFB);
78 (*hotspots)[i].left = sib.left;
79 (*hotspots)[i].top = sib.top;
80 (*hotspots)[i].right = sib.left + sib.width;
81 (*hotspots)[i].bottom = sib.top + sib.height;
82 (*hotspots)[i].IsVisible = ((sib.hotspotType & 4) == 0);
83 (*hotspots)[i].szHlpTopic_Macro[0] = '\0';
84 }
85 // we have it...now read-off the macro-string block
86 if(nMacroStrings > 0)
87 fseek( fSHG, nMacroStrings, SEEK_CUR); //nMacroStrings is byte offset...
88 // and, at the last, read through the strings: hotspot-id[ignored], then topic/macro
89 int c;
90 for( i = 0 ; i < nHotspots ; ++i)
91 {
92 while( (c = fgetc( fSHG)) != 0)
93 ;
94 // now read it:
95 int j = 0;
96 while( (c = fgetc( fSHG)) != 0)
97 {
98 (*hotspots)[i].szHlpTopic_Macro[j] = (wxChar)c;
99 ++j;
100 }
101 (*hotspots)[i].szHlpTopic_Macro[j] = 0;
102 }
103 fclose( fSHG);
104 return nHotspots;
105 }
106
107
108 // Convert Windows .SHG file to HTML map file
109
SHGToMap(wxChar * filename,wxChar * defaultFile)110 bool SHGToMap(wxChar *filename, wxChar *defaultFile)
111 {
112 // Test the SHG parser
113 HotSpot *hotspots = NULL;
114 int n = ParseSHG(filename, &hotspots);
115 if (n == 0)
116 return false;
117
118 wxChar buf[100];
119 wxSnprintf(buf, sizeof(buf), _T("Converting .SHG file to HTML map file: there are %d hotspots in %s."), n, filename);
120 OnInform(buf);
121
122 wxChar outBuf[256];
123 wxStrcpy(outBuf, filename);
124 StripExtension(outBuf);
125 wxStrcat(outBuf, _T(".map"));
126
127 FILE *fd = wxFopen(outBuf, _T("w"));
128 if (!fd)
129 {
130 OnError(_T("Could not open .map file for writing."));
131 delete[] hotspots;
132 return false;
133 }
134
135 wxFprintf(fd, _T("default %s\n"), defaultFile);
136 for (int i = 0; i < n; i++)
137 {
138 wxChar *refFilename = _T("??");
139
140 TexRef *texRef = FindReference(hotspots[i].szHlpTopic_Macro);
141 if (texRef)
142 refFilename = texRef->refFile;
143 else
144 {
145 wxChar buf[300];
146 wxSnprintf(buf, sizeof(buf), _T("Warning: could not find hotspot reference %s"), hotspots[i].szHlpTopic_Macro);
147 OnInform(buf);
148 }
149 wxFprintf(fd, _T("rect %s %d %d %d %d\n"), refFilename, (int)hotspots[i].left, (int)hotspots[i].top,
150 (int)hotspots[i].right, (int)hotspots[i].bottom);
151 }
152 wxFprintf(fd, _T("\n"));
153
154 fclose(fd);
155
156 delete[] hotspots;
157 return true;
158 }
159
160