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/*
* Copyright (C) 2004-2012 Geometer Plus <contact@geometerplus.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#include "OleUtil.h"
#include "OleMainStream.h"
#include "DocInlineImageReader.h"
DocInlineImageReader::DocInlineImageReader(shared_ptr<OleStream> dataStream) :
myDataStream(dataStream) {
}
ZLFileImage::Blocks DocInlineImageReader::getImagePieceInfo(unsigned int dataPos) {
if (myDataStream.isNull()) {
return ZLFileImage::Blocks();
}
if (!myDataStream->seek(dataPos, true)) {
return ZLFileImage::Blocks();
}
//reading PICF structure (see p. 421 [MS-DOC])
unsigned int picfHeaderSize = 4 + 2 + 8; //record length, headerLength and storage format
char headerBuffer[picfHeaderSize];
if (myDataStream->read(headerBuffer, picfHeaderSize) != picfHeaderSize) {
return ZLFileImage::Blocks();
}
unsigned int length = OleUtil::getU4Bytes(headerBuffer, 0);
unsigned int headerLength = OleUtil::getU2Bytes(headerBuffer, 4);
unsigned int formatType = OleUtil::getU2Bytes(headerBuffer, 6);
if (formatType != 0x0064) { //external link to some file; see p.394 [MS-DOC]
//TODO implement
return ZLFileImage::Blocks();
}
if (headerLength >= length) {
return ZLFileImage::Blocks();
}
//reading OfficeArtInlineSpContainer structure; see p.421 [MS-DOC] and p.56 [MS-ODRAW]
if (!myDataStream->seek(headerLength - picfHeaderSize, false)) { //skip header
return ZLFileImage::Blocks();
}
char buffer[8]; //for OfficeArtRecordHeader structure; see p.69 [MS-ODRAW]
bool found = false;
unsigned int curOffset = 0;
for (curOffset = headerLength; !found && curOffset + 8 <= length; curOffset += 8) {
if (myDataStream->read(buffer, 8) != 8) {
return ZLFileImage::Blocks();
}
unsigned int recordInstance = OleUtil::getU2Bytes(buffer, 0) >> 4;
unsigned int recordType = OleUtil::getU2Bytes(buffer, 2);
unsigned int recordLen = OleUtil::getU4Bytes(buffer, 4);
switch (recordType) {
case 0xF000: case 0xF001: case 0xF002: case 0xF003: case 0xF004: case 0xF005:
break;
case 0xF007:
{
myDataStream->seek(33, false);
char tmpBuf[1];
myDataStream->read(tmpBuf, 1);
unsigned int nameLength = OleUtil::getU1Byte(tmpBuf, 0);
myDataStream->seek(nameLength * 2 + 2, false);
curOffset += 33 + 1 + nameLength * 2 + 2;
}
break;
case 0xF008:
myDataStream->seek(8, false);
curOffset += 8;
break;
case 0xF009:
myDataStream->seek(16, false);
curOffset += 16;
break;
case 0xF006: case 0xF00A: case 0xF00B: case 0xF00D: case 0xF00E: case 0xF00F: case 0xF010: case 0xF011: case 0xF122:
myDataStream->seek(recordLen, false);
curOffset += recordLen;
break;
case OleMainStream::IMAGE_EMF:
case OleMainStream::IMAGE_WMF:
case OleMainStream::IMAGE_PICT:
//TODO implement
return ZLFileImage::Blocks();
case OleMainStream::IMAGE_JPEG:
case OleMainStream::IMAGE_JPEG2:
myDataStream->seek(17, false);
curOffset += 17;
if (recordInstance == 0x46B || recordInstance == 0x6E3) {
myDataStream->seek(16, false);
curOffset += 16;
}
found = true;
break;
case OleMainStream::IMAGE_PNG:
myDataStream->seek(17, false);
curOffset += 17;
if (recordInstance == 0x6E1) {
myDataStream->seek(16, false);
curOffset += 16;
}
found = true;
break;
case OleMainStream::IMAGE_DIB: // DIB = BMP without 14-bytes header
myDataStream->seek(17, false);
curOffset += 17;
if (recordInstance == 0x7A9) {
myDataStream->seek(16, false);
curOffset += 16;
}
found = true;
break;
case OleMainStream::IMAGE_TIFF:
myDataStream->seek(17, false);
curOffset += 17;
if (recordInstance == 0x6E5) {
myDataStream->seek(16, false);
curOffset += 16;
}
found = true;
break;
case 0xF00C:
default:
return ZLFileImage::Blocks();
}
}
if (!found) {
return ZLFileImage::Blocks();
}
return myDataStream->getBlockPieceInfoList(dataPos + curOffset, length - curOffset);
}
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