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/*
* Copyright (C) 2004-2012 Geometer Plus <[email protected]>
*
* 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 <cstring>
#include <cstdlib>
#include <string>
#include "DocStreams.h"
#include "OleStreamReader.h"
class DocReader : public OleStreamReader {
public:
DocReader(char *buffer, std::size_t maxSize);
~DocReader();
std::size_t readSize() const;
private:
bool readStream(OleMainStream &stream);
void ansiDataHandler(const char *buffer, std::size_t len);
void ucs2SymbolHandler(ZLUnicodeUtil::Ucs2Char symbol);
void footnotesStartHandler();
protected:
char *myBuffer;
const std::size_t myMaxSize;
std::size_t myActualSize;
};
class DocAnsiReader : public DocReader {
public:
DocAnsiReader(char *buffer, std::size_t maxSize);
~DocAnsiReader();
private:
void ansiDataHandler(const char *buffer, std::size_t len);
};
class DocUcs2Reader : public DocReader {
public:
DocUcs2Reader(char *buffer, std::size_t maxSize);
~DocUcs2Reader();
private:
void ucs2SymbolHandler(ZLUnicodeUtil::Ucs2Char symbol);
};
DocReader::DocReader(char *buffer, std::size_t maxSize) : myBuffer(buffer), myMaxSize(maxSize), myActualSize(0) {
}
DocReader::~DocReader() {
}
bool DocReader::readStream(OleMainStream &stream) {
// TODO make 2 optmizations:
// 1) If another piece is too big, reading of next piece can be stopped if some size parameter will be specified
// (it can be transfered as a parameter (with default 0 value, that means no need to use it) to readNextPiece method)
// 2) We can specify as a parameter for readNextPiece, what kind of piece should be read next (ANSI or not ANSI).
// As type of piece is known already, there's no necessary to read other pieces.
while (myActualSize < myMaxSize) {
if (!readNextPiece(stream)) {
break;
}
}
return true;
}
void DocReader::ansiDataHandler(const char*, std::size_t) {
}
void DocReader::ucs2SymbolHandler(ZLUnicodeUtil::Ucs2Char) {
}
void DocReader::footnotesStartHandler() {
}
std::size_t DocReader::readSize() const {
return myActualSize;
}
DocAnsiReader::DocAnsiReader(char *buffer, std::size_t maxSize) : DocReader(buffer, maxSize) {
}
DocAnsiReader::~DocAnsiReader() {
}
void DocAnsiReader::ansiDataHandler(const char *buffer, std::size_t dataLength) {
if (myActualSize < myMaxSize) {
const std::size_t len = std::min(dataLength, myMaxSize - myActualSize);
std::strncpy(myBuffer + myActualSize, buffer, len);
myActualSize += len;
}
}
DocUcs2Reader::DocUcs2Reader(char *buffer, std::size_t maxSize) : DocReader(buffer, maxSize) {
}
DocUcs2Reader::~DocUcs2Reader() {
}
void DocUcs2Reader::ucs2SymbolHandler(ZLUnicodeUtil::Ucs2Char symbol) {
if (myActualSize < myMaxSize) {
char buffer[4];
const std::size_t dataLength = ZLUnicodeUtil::ucs2ToUtf8(buffer, symbol);
const std::size_t len = std::min(dataLength, myMaxSize - myActualSize);
std::strncpy(myBuffer + myActualSize, buffer, len);
myActualSize += len;
}
}
DocStream::DocStream(const ZLFile& file, std::size_t maxSize) : myFile(file), myBuffer(0), mySize(maxSize) {
}
DocStream::~DocStream() {
close();
}
bool DocStream::open() {
if (mySize != 0) {
myBuffer = new char[mySize];
}
shared_ptr<DocReader> reader = createReader(myBuffer, mySize);
shared_ptr<ZLInputStream> stream = myFile.inputStream();
if (stream.isNull() || !stream->open()) {
return false;
}
if (!reader->readDocument(stream, false)) {
return false;
}
mySize = reader->readSize();
myOffset = 0;
return true;
}
std::size_t DocStream::read(char *buffer, std::size_t maxSize) {
maxSize = std::min(maxSize, mySize - myOffset);
if (buffer != 0 && myBuffer != 0) {
std::memcpy(buffer, myBuffer + myOffset, maxSize);
}
myOffset += maxSize;
return maxSize;
}
void DocStream::close() {
if (myBuffer != 0) {
delete[] myBuffer;
myBuffer = 0;
}
}
void DocStream::seek(int offset, bool absoluteOffset) {
if (!absoluteOffset) {
offset += myOffset;
}
myOffset = std::min(mySize, (std::size_t)std::max(0, offset));
}
std::size_t DocStream::offset() const {
return myOffset;
}
std::size_t DocStream::sizeOfOpened() {
return mySize;
}
DocAnsiStream::DocAnsiStream(const ZLFile& file, std::size_t maxSize) : DocStream(file, maxSize) {
}
DocAnsiStream::~DocAnsiStream() {
}
shared_ptr<DocReader> DocAnsiStream::createReader(char *buffer, std::size_t maxSize) {
return new DocAnsiReader(buffer, maxSize);
}
DocUcs2Stream::DocUcs2Stream(const ZLFile& file, std::size_t maxSize) : DocStream(file, maxSize) {
}
DocUcs2Stream::~DocUcs2Stream() {
}
shared_ptr<DocReader> DocUcs2Stream::createReader(char *buffer, std::size_t maxSize) {
return new DocUcs2Reader(buffer, maxSize);
}
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