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/*
* Copyright (C) 2008-2012 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 <cstring>
#include <ZLXMLReader.h>
#include <ZLUnicodeUtil.h>
#include <ZLPlainAsynchronousInputStream.h>
#include "XMLTextStream.h"
class XMLTextReader : public ZLXMLReader {
public:
XMLTextReader(std::string &buffer, const std::string &startTag);
private:
void startElementHandler(const char *tag, const char **attributes);
void characterDataHandler(const char *text, std::size_t len);
private:
const std::string myStartTag;
std::string &myBuffer;
bool myStarted;
};
XMLTextReader::XMLTextReader(std::string &buffer, const std::string &startTag) : myStartTag(ZLUnicodeUtil::toLower(startTag)), myBuffer(buffer), myStarted(myStartTag.empty()) {
}
void XMLTextReader::startElementHandler(const char *tag, const char**) {
if (!myStarted && (myStartTag == ZLUnicodeUtil::toLower(tag))) {
myStarted = true;
}
}
void XMLTextReader::characterDataHandler(const char *text, std::size_t len) {
if (myStarted) {
myBuffer.append(text, len);
}
}
XMLTextStream::XMLTextStream(shared_ptr<ZLInputStream> base, const std::string &startTag) : myBase(base), myStreamBuffer(2048, '\0') {
myReader = new XMLTextReader(myDataBuffer, startTag);
}
XMLTextStream::~XMLTextStream() {
}
bool XMLTextStream::open() {
close();
if (myBase.isNull() || !myBase->open()) {
return false;
}
myStream = new ZLPlainAsynchronousInputStream();
myOffset = 0;
return true;
}
std::size_t XMLTextStream::read(char *buffer, std::size_t maxSize) {
while (myDataBuffer.size() < maxSize) {
std::size_t len = myBase->read((char*)myStreamBuffer.data(), 2048);
/*if ((len == 0) || !myReader->readFromBuffer(myStreamBuffer.data(), len)) {
break;
}*/
if (len == 0) {
break;
}
myStream->setBuffer(myStreamBuffer.data(), len);
if (!myReader->readDocument(myStream)) {
break;
}
}
std::size_t realSize = std::min(myDataBuffer.size(), maxSize);
if (buffer != 0) {
std::memcpy(buffer, myDataBuffer.data(), realSize);
}
myDataBuffer.erase(0, realSize);
myOffset += realSize;
return realSize;
}
void XMLTextStream::close() {
if (!myStream.isNull()) {
myStream->setEof();
myReader->readDocument(myStream);
myStream.reset();
}
myBase->close();
myDataBuffer.erase();
}
void XMLTextStream::seek(int offset, bool absoluteOffset) {
// works for nonnegative offsets only
if (absoluteOffset) {
offset -= myOffset;
}
read(0, offset);
}
std::size_t XMLTextStream::offset() const {
return myOffset;
}
std::size_t XMLTextStream::sizeOfOpened() {
// couldn't be implemented
return 0;
}
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