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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 <ZLLogger.h>
#include "OleStream.h"
#include "OleUtil.h"
OleStream::OleStream(shared_ptr<OleStorage> storage, OleEntry oleEntry, shared_ptr<ZLInputStream> stream) :
myStorage(storage),
myOleEntry(oleEntry),
myBaseStream(stream) {
myOleOffset = 0;
}
bool OleStream::open() {
if (myOleEntry.type != OleEntry::STREAM) {
return false;
}
return true;
}
std::size_t OleStream::read(char *buffer, std::size_t maxSize) {
std::size_t length = maxSize;
std::size_t readedBytes = 0;
std::size_t bytesLeftInCurBlock;
unsigned int newFileOffset;
unsigned int curBlockNumber, modBlock;
std::size_t toReadBlocks, toReadBytes;
if (myOleOffset + length > myOleEntry.length) {
length = myOleEntry.length - myOleOffset;
}
std::size_t sectorSize = (std::size_t)(myOleEntry.isBigBlock ? myStorage->getSectorSize() : myStorage->getShortSectorSize());
curBlockNumber = myOleOffset / sectorSize;
if (curBlockNumber >= myOleEntry.blocks.size()) {
return 0;
}
modBlock = myOleOffset % sectorSize;
bytesLeftInCurBlock = sectorSize - modBlock;
if (bytesLeftInCurBlock < length) {
toReadBlocks = (length - bytesLeftInCurBlock) / sectorSize;
toReadBytes = (length - bytesLeftInCurBlock) % sectorSize;
} else {
toReadBlocks = toReadBytes = 0;
}
if (!myStorage->countFileOffsetOfBlock(myOleEntry, curBlockNumber, newFileOffset)) {
return 0;
}
newFileOffset += modBlock;
myBaseStream->seek(newFileOffset, true);
readedBytes = myBaseStream->read(buffer, std::min(length, bytesLeftInCurBlock));
for (std::size_t i = 0; i < toReadBlocks; ++i) {
if (++curBlockNumber >= myOleEntry.blocks.size()) {
break;
}
if (!myStorage->countFileOffsetOfBlock(myOleEntry, curBlockNumber, newFileOffset)) {
return readedBytes;
}
myBaseStream->seek(newFileOffset, true);
readedBytes += myBaseStream->read(buffer + readedBytes, std::min(length - readedBytes, sectorSize));
}
if (toReadBytes > 0 && ++curBlockNumber < myOleEntry.blocks.size()) {
if (!myStorage->countFileOffsetOfBlock(myOleEntry, curBlockNumber, newFileOffset)) {
return readedBytes;
}
myBaseStream->seek(newFileOffset, true);
readedBytes += myBaseStream->read(buffer + readedBytes, toReadBytes);
}
myOleOffset += readedBytes;
return readedBytes;
}
bool OleStream::eof() const {
return (myOleOffset >= myOleEntry.length);
}
void OleStream::close() {
}
bool OleStream::seek(unsigned int offset, bool absoluteOffset) {
unsigned int newOleOffset = 0;
unsigned int newFileOffset;
if (absoluteOffset) {
newOleOffset = offset;
} else {
newOleOffset = myOleOffset + offset;
}
newOleOffset = std::min(newOleOffset, myOleEntry.length);
unsigned int sectorSize = (myOleEntry.isBigBlock ? myStorage->getSectorSize() : myStorage->getShortSectorSize());
unsigned int blockNumber = newOleOffset / sectorSize;
if (blockNumber >= myOleEntry.blocks.size()) {
return false;
}
unsigned int modBlock = newOleOffset % sectorSize;
if (!myStorage->countFileOffsetOfBlock(myOleEntry, blockNumber, newFileOffset)) {
return false;
}
newFileOffset += modBlock;
myBaseStream->seek(newFileOffset, true);
myOleOffset = newOleOffset;
return true;
}
std::size_t OleStream::offset() {
return myOleOffset;
}
ZLFileImage::Blocks OleStream::getBlockPieceInfoList(unsigned int offset, unsigned int size) const {
ZLFileImage::Blocks list;
unsigned int sectorSize = (myOleEntry.isBigBlock ? myStorage->getSectorSize() : myStorage->getShortSectorSize());
unsigned int curBlockNumber = offset / sectorSize;
if (curBlockNumber >= myOleEntry.blocks.size()) {
return list;
}
unsigned int modBlock = offset % sectorSize;
unsigned int startFileOffset = 0;
if (!myStorage->countFileOffsetOfBlock(myOleEntry, curBlockNumber, startFileOffset)) {
return ZLFileImage::Blocks();
}
startFileOffset += modBlock;
unsigned int bytesLeftInCurBlock = sectorSize - modBlock;
unsigned int toReadBlocks = 0, toReadBytes = 0;
if (bytesLeftInCurBlock < size) {
toReadBlocks = (size - bytesLeftInCurBlock) / sectorSize;
toReadBytes = (size - bytesLeftInCurBlock) % sectorSize;
}
unsigned int readedBytes = std::min(size, bytesLeftInCurBlock);
list.push_back(ZLFileImage::Block(startFileOffset, readedBytes));
for (unsigned int i = 0; i < toReadBlocks; ++i) {
if (++curBlockNumber >= myOleEntry.blocks.size()) {
break;
}
unsigned int newFileOffset = 0;
if (!myStorage->countFileOffsetOfBlock(myOleEntry, curBlockNumber, newFileOffset)) {
return ZLFileImage::Blocks();
}
unsigned int readbytes = std::min(size - readedBytes, sectorSize);
list.push_back(ZLFileImage::Block(newFileOffset, readbytes));
readedBytes += readbytes;
}
if (toReadBytes > 0 && ++curBlockNumber < myOleEntry.blocks.size()) {
unsigned int newFileOffset = 0;
if (!myStorage->countFileOffsetOfBlock(myOleEntry, curBlockNumber, newFileOffset)) {
return ZLFileImage::Blocks();
}
unsigned int readbytes = toReadBytes;
list.push_back(ZLFileImage::Block(newFileOffset, readbytes));
readedBytes += readbytes;
}
return concatBlocks(list);
}
ZLFileImage::Blocks OleStream::concatBlocks(const ZLFileImage::Blocks &blocks) {
if (blocks.size() < 2) {
return blocks;
}
ZLFileImage::Blocks optList;
ZLFileImage::Block curBlock = blocks.at(0);
unsigned int nextOffset = curBlock.offset + curBlock.size;
for (std::size_t i = 1; i < blocks.size(); ++i) {
ZLFileImage::Block b = blocks.at(i);
if (b.offset == nextOffset) {
curBlock.size += b.size;
nextOffset += b.size;
} else {
optList.push_back(curBlock);
curBlock = b;
nextOffset = curBlock.offset + curBlock.size;
}
}
optList.push_back(curBlock);
return optList;
}
std::size_t OleStream::fileOffset() {
//TODO maybe remove this method, it doesn't use at this time
std::size_t sectorSize = (std::size_t)(myOleEntry.isBigBlock ? myStorage->getSectorSize() : myStorage->getShortSectorSize());
unsigned int curBlockNumber = myOleOffset / sectorSize;
if (curBlockNumber >= myOleEntry.blocks.size()) {
return 0;
}
unsigned int modBlock = myOleOffset % sectorSize;
unsigned int curOffset = 0;
if (!myStorage->countFileOffsetOfBlock(myOleEntry, curBlockNumber, curOffset)) {
return 0; //TODO maybe remove -1?
}
return curOffset + modBlock;
}
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