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// *****************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: http://www.gnu.org/licenses/gpl-3.0 *
// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
// *****************************************************************************
#include "xml_io.h"
#include "file_access.h"
#include "file_io.h"
using namespace zen;
XmlDoc zen::loadXmlDocument(const Zstring& filepath) //throw FileError
{
//can't simply use zen::unbufferedLoad) due to the short-circuit xml-validation below!
FileInput fileIn(filepath); //throw FileError, ErrorFileLocked
const size_t blockSize = fileIn.getBlockSize();
const std::string xmlPrefix = "<?xml version=";
bool xmlPrefixChecked = false;
std::string buffer;
for (;;)
{
buffer.resize(buffer.size() + blockSize);
const size_t bytesRead = fileIn.tryRead(&*(buffer.end() - blockSize), blockSize); //throw X; may return short, only 0 means EOF! => CONTRACT: bytesToRead > 0
buffer.resize(buffer.size() - blockSize + bytesRead); //caveat: unsigned arithmetics
//quick test whether input is an XML: avoid loading large binary files up front!
if (!xmlPrefixChecked && buffer.size() >= xmlPrefix.size() + strLength(BYTE_ORDER_MARK_UTF8))
{
xmlPrefixChecked = true;
if (!startsWith(buffer, xmlPrefix) &&
!startsWith(buffer, BYTE_ORDER_MARK_UTF8 + xmlPrefix)) //allow BOM!
throw FileError(replaceCpy(_("File %x does not contain a valid configuration."), L"%x", fmtPath(filepath)));
}
if (bytesRead == 0) //end of file
break;
}
try
{
return parse(buffer); //throw XmlParsingError
}
catch (const XmlParsingError& e)
{
throw FileError(
replaceCpy(replaceCpy(replaceCpy(_("Error parsing file %x, row %y, column %z."),
L"%x", fmtPath(filepath)),
L"%y", numberTo<std::wstring>(e.row + 1)),
L"%z", numberTo<std::wstring>(e.col + 1)));
}
}
void zen::saveXmlDocument(const XmlDoc& doc, const Zstring& filepath) //throw FileError
{
const std::string stream = serialize(doc); //noexcept
//only update xml file if there are real changes
try
{
if (getFilesize(filepath) == stream.size()) //throw FileError
if (loadBinContainer<std::string>(filepath, nullptr) == stream) //throw FileError
return;
}
catch (FileError&) {}
saveBinContainer(filepath, stream, nullptr); //throw FileError
}
void zen::checkForMappingErrors(const XmlIn& xmlInput, const Zstring& filepath) //throw FileError
{
if (xmlInput.errorsOccured())
{
std::wstring msg = _("The following XML elements could not be read:") + L"\n";
for (const std::wstring& elem : xmlInput.getErrorsAs<std::wstring>())
msg += L"\n" + elem;
throw FileError(replaceCpy(_("Configuration file %x is incomplete. The missing elements will be set to their default values."), L"%x", fmtPath(filepath)) + L"\n\n" + msg);
}
}
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