/************************************************************************
*
* SVMReader.java
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
* Copyright: 2004 by Urban Widmark
*
* All Rights Reserved.
*
* Version 0.4 (2004-02-26)
*
*/
package writer2latex.office;
/** This class contains a static method to extract EPS data from an SVM file */
public final class SVMReader {
/* Notes on SVM file format:
Relevant OO 1.1.0 Source Files include:
tools/source/stream/vcompat.cxx
vcl/source/gdi/gdimtf.cxx
vcl/inc/gdimtf.hxx
vcl/source/gdi/metaact.cxx
vcl/inc/metaact.hxx
vcl/source/gdi/mapmod.cxx
vcl/inc/mapmod.hxx
tools/source/generic/fract.cxx
tools/inc/fract.hxx
tools/source/generic/gen.cxx
tools/inc/gen.hxx
VersionCompat (6 bytes)
version - 2 bytes
totalsize - 4 bytes
Point (Pair) (8 bytes)
X - 4 bytes (long)
Y - 4 bytes (long)
Fraction (8 bytes)
nNumerator - 4 bytes (long)
nDenominator - 4 bytes (long)
MapMode (6 + 2 + 8 + 8 + 8 + 1 = 33 bytes)
VersionCompat
meUnit - UINT16
maOrigin - Point
maScaleX - Fraction
maScaleY - Fraction
mbSimple - BOOL (1 byte)
Size (Pair) (8 bytes)
width - 4 bytes (long)
height - 4 bytes (long)
GfxLink (16 or 57 bytes)
VersionCompat
nType - 2 bytes
nSize - 4 bytes
nUserId - 4 bytes
aSize - Size (version >=2)
aMapMode - MapMode (version >=2)
MetaEPSAction
VersionCompat
maGfxLink - GfxLink
data[maGfxLink.nSize] - bytes
maPoint - Point
maSize - Size
maSubst - GDIMetaFile (alternative image?)
SVM file
"VCLMTF"
Compat - VersionCompat
nStmCompressMode - UINT32
aPrefMapMode - MapMode
aPrefSize - Size
count - UINT32
action[count] - MetaAction
Example header from an EPS image included in a Writer document:
00000000: 5643 4c4d 5446 0100 3100 0000 0000 0000 VCLMTF..1.......
00000010: 0100 1b00 0000 0800 0000 0000 0000 0000 ................
00000020: 0100 0000 0100 0000 0100 0000 0100 0000 ................
00000030: 0169 0100 00fd 0000 0001 0000 008f 0001 .i..............
00000040: 0096 3200 0002 0033 0000 0001 003f 3000 ..2....3.....?0.
00000050: 0000 0000 0000 0000 0000 0000 0001 001b ................
00000060: 0000 000a 0000 0000 0000 0000 0001 0000 ................
00000070: 0001 0000 0001 0000 0001 0000 0001 2521 ..............%!
5643 4c4d 5446 "VCLMTF" 0
0100 version 6
3100 0000 totalsize
0000 0000 compress 12
0100 aPrefMapMode.version 16
1b00 0000 aPrefMapMode.totalsize
0800 aPrefMapMode.meUnit
0000 0000 aPrefMapMode.maOrigin
0000 0000
0100 0000 aPrefMapMode.maScaleX
0100 0000
0100 0000 aPrefMapMode.maScaleY
0100 0000
01 aPrefMapMode.mbSimple
6901 0000 aPrefSize 49
fd00 0000
0100 0000 nCount 57
8f00 type == META_EPS_ACTION 61
0100 version
9632 0000 totalsize
0200 version
3300 0000 totalsize
0100 nType
3f30 0000 nSize 75
0000 0000 nUserId
0000 0000 aSize
0000 0000
0100
1b00 0000
0a00
0000 0000
0000 0000
0100 0000
0100 0000
0100 0000
0100 0000
01
Beginning of EPS data:
2521
Note that maPoint/maSize/maSubst are all after the EPS file.
*/
/** Determine if this SVM contains an EPS document and retrieve start and
* end positions if so.
*
* @param blob byte array containing SVM file
* @param offlen integer array to retrieve the offset into the SVM file
* (offlen[0]) and the length (offlen[1]) of the EPS
* document. If the method returns false, the array
* will be unchanged.
*
* @return returns true if the SVM contains an EPS document
*/
public static final boolean readSVM(byte[] blob, int[] offlen) {
int pos = 57;
int nCount = getInt(blob, pos);
pos += 4;
for (int i=0; i<nCount; i++) {
int type = getShort(blob, pos);
pos += 2;
// We only understand META_EPS_ACTION
if (type != 143)
return false;
pos += 6;
int version = getShort(blob, pos);
pos += 6; // version + totalsize
pos += 2; // nType
// This is the size of the EPS data.
int size = getInt(blob, pos);
pos += 8;
if (version >= 2)
pos += 41;
for (int j=0; j<MIMETypes.EPS_SIG.length; j++)
if (MIMETypes.EPS_SIG[j] != blob[pos + j])
return false;
offlen[0] = pos;
offlen[1] = size;
// For now we only understand files where the EPS entry is
// the first MetaAction
break;
}
return true;
}
private static int getInt(byte[] blob, int pos)
{
return
((blob[pos+0] & 0xff) << 0) +
((blob[pos+1] & 0xff) << 8) +
((blob[pos+2] & 0xff) << 16) +
((blob[pos+3] & 0xff) << 24);
}
private static int getShort(byte[] blob, int pos)
{
return
((blob[pos+0] & 0xff) << 0) +
((blob[pos+1] & 0xff) << 8);
}
}