nzbget/daemon/queue/NzbFile.cpp

/*
 *  This file is part of nzbget
 *
 *  Copyright (C) 2004 Sven Henkel <sidddy@users.sourceforge.net>
 *  Copyright (C) 2007-2015 Andrey Prygunkov <hugbug@users.sourceforge.net>
 *
 *  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.
 *
 * $Revision$
 * $Date$
 *
 */


#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef WIN32
#include "win32.h"
#endif

#include <string.h>
#include <list>
#include <ctype.h>
#ifdef WIN32
#include <comutil.h>
#import <msxml.tlb> named_guids 
using namespace MSXML;
#else
#include <libxml/parser.h>
#include <libxml/xmlreader.h>
#include <libxml/xmlerror.h>
#include <libxml/entities.h>
#endif

#include "nzbget.h"
#include "NZBFile.h"
#include "Log.h"
#include "DownloadInfo.h"
#include "Options.h"
#include "DiskState.h"
#include "Util.h"

NzbFile::NzbFile(const char* fileName, const char* category)
{
    debug("Creating NZBFile");

    m_fileName = strdup(fileName);
	m_password = NULL;
	m_nzbInfo = new NzbInfo();
	m_nzbInfo->SetFilename(fileName);
	m_nzbInfo->SetCategory(category);
	m_nzbInfo->BuildDestDirName();

#ifndef WIN32
	m_hasPassword = false;
	m_fileInfo = NULL;
	m_article = NULL;
	m_tagContent = NULL;
	m_tagContentLen = 0;
#endif
}

NzbFile::~NzbFile()
{
    debug("Destroying NZBFile");

    // Cleanup
    free(m_fileName);
    free(m_password);

#ifndef WIN32
	delete m_fileInfo;
	free(m_tagContent);
#endif

	delete m_nzbInfo;
}

void NzbFile::LogDebugInfo()
{
    info(" NZBFile %s", m_fileName);
}

void NzbFile::AddArticle(FileInfo* fileInfo, ArticleInfo* articleInfo)
{
	// make Article-List big enough
	while ((int)fileInfo->GetArticles()->size() < articleInfo->GetPartNumber())
		fileInfo->GetArticles()->push_back(NULL);

	int index = articleInfo->GetPartNumber() - 1;
	if ((*fileInfo->GetArticles())[index])
	{
		delete (*fileInfo->GetArticles())[index];
	}
	(*fileInfo->GetArticles())[index] = articleInfo;
}

void NzbFile::AddFileInfo(FileInfo* fileInfo)
{
	// calculate file size and delete empty articles

	long long size = 0;
	long long missedSize = 0;
	long long oneSize = 0;
	int uncountedArticles = 0;
	int missedArticles = 0;
	FileInfo::Articles* articles = fileInfo->GetArticles();
	int totalArticles = (int)articles->size();
	int i = 0;
	for (FileInfo::Articles::iterator it = articles->begin(); it != articles->end(); )
	{
		ArticleInfo* article = *it;
		if (!article)
		{
			articles->erase(it);
			it = articles->begin() + i;
			missedArticles++;
			if (oneSize > 0)
			{
				missedSize += oneSize;
			}
			else
			{
				uncountedArticles++;
			}
		}
		else
		{
			size += article->GetSize();
			if (oneSize == 0)
			{
				oneSize = article->GetSize();
			}
			it++;
			i++;
		}
	}

	if (articles->empty())
	{
		delete fileInfo;
		return;
	}

	missedSize += uncountedArticles * oneSize;
	size += missedSize;
	m_nzbInfo->GetFileList()->push_back(fileInfo);
	fileInfo->SetNzbInfo(m_nzbInfo);
	fileInfo->SetSize(size);
	fileInfo->SetRemainingSize(size - missedSize);
	fileInfo->SetMissedSize(missedSize);
	fileInfo->SetTotalArticles(totalArticles);
	fileInfo->SetMissedArticles(missedArticles);
}

void NzbFile::ParseSubject(FileInfo* fileInfo, bool TryQuotes)
{
	// Example subject: some garbage "title" yEnc (10/99)

	// strip the "yEnc (10/99)"-suffix
	char subject[1024];
	strncpy(subject, fileInfo->GetSubject(), sizeof(subject));
	subject[1024-1] = '\0';
	char* end = subject + strlen(subject) - 1;
	if (*end == ')')
	{
		end--;
		while (strchr("0123456789", *end) && end > subject) end--;
		if (*end == '/')
		{
			end--;
			while (strchr("0123456789", *end) && end > subject) end--;
			if (end - 6 > subject && !strncmp(end - 6, " yEnc (", 7))
			{
				end[-6] = '\0';
			}
		}
	}

	if (TryQuotes)
	{
		// try to use the filename in quatation marks 
		char* p = subject;
		char* start = strchr(p, '\"');
		if (start)
		{
			start++;
			char* end = strchr(start + 1, '\"');
			if (end)
			{
				int len = (int)(end - start);
				char* point = strchr(start + 1, '.');
				if (point && point < end)
				{
					char* filename = (char*)malloc(len + 1);
					strncpy(filename, start, len);
					filename[len] = '\0';
					fileInfo->SetFilename(filename);
					free(filename);
					return;
				}
			}
		}
	}

	// tokenize subject, considering spaces as separators and quotation 
	// marks as non separatable token delimiters.
	// then take the last token containing dot (".") as a filename

	typedef std::list<char*> TokenList;
	TokenList tokens;
	tokens.clear();

	// tokenizing
	char* p = subject;
	char* start = p;
	bool quot = false;
	while (true)
	{
		char ch = *p;
		bool sep = (ch == '\"') || (!quot && ch == ' ') || (ch == '\0');
		if (sep)
		{
			// end of token
			int len = (int)(p - start);
			if (len > 0)
			{
				char* token = (char*)malloc(len + 1);
				strncpy(token, start, len);
				token[len] = '\0';
				tokens.push_back(token);
			}
			start = p;
			if (ch != '\"' || quot)
			{
				start++;
			}
			quot = *start == '\"';
			if (quot)
			{
				start++;
				char* q = strchr(start, '\"');
				if (q)
				{
					p = q - 1;
				}
				else
				{
					quot = false;
				}
			}
		}
		if (ch == '\0')
		{
			break;
		}
		p++;
	}

	if (!tokens.empty())
	{
		// finding the best candidate for being a filename
		char* besttoken = tokens.back();
		for (TokenList::reverse_iterator it = tokens.rbegin(); it != tokens.rend(); it++)
		{
			char* s = *it;
			char* p = strchr(s, '.');
			if (p && (p[1] != '\0'))
			{
				besttoken = s;
				break;
			}
		}
		fileInfo->SetFilename(besttoken);

		// free mem
		for (TokenList::iterator it = tokens.begin(); it != tokens.end(); it++)
		{
			free(*it);
		}
	}
	else
	{
		// subject is empty or contains only separators?
		debug("Could not extract Filename from Subject: %s. Using Subject as Filename", fileInfo->GetSubject());
		fileInfo->SetFilename(fileInfo->GetSubject());
	}
}

bool NzbFile::HasDuplicateFilenames()
{
	for (FileList::iterator it = m_nzbInfo->GetFileList()->begin(); it != m_nzbInfo->GetFileList()->end(); it++)
    {
        FileInfo* fileInfo1 = *it;
		int dupe = 1;
		for (FileList::iterator it2 = it + 1; it2 != m_nzbInfo->GetFileList()->end(); it2++)
		{
			FileInfo* fileInfo2 = *it2;
			if (!strcmp(fileInfo1->GetFilename(), fileInfo2->GetFilename()) &&
				strcmp(fileInfo1->GetSubject(), fileInfo2->GetSubject()))
			{
				dupe++;
			}
		}

		// If more than two files have the same parsed filename but different subjects,
		// this means, that the parsing was not correct.
		// in this case we take subjects as filenames to prevent 
		// false "duplicate files"-alarm.
		// It's Ok for just two files to have the same filename, this is 
		// an often case by posting-errors to repost bad files
		if (dupe > 2 || (dupe == 2 && m_nzbInfo->GetFileList()->size() == 2))
		{
			return true;
		}
    }

	return false;
}

/**
 * Generate filenames from subjects and check if the parsing of subject was correct
 */
void NzbFile::BuildFilenames()
{
	for (FileList::iterator it = m_nzbInfo->GetFileList()->begin(); it != m_nzbInfo->GetFileList()->end(); it++)
    {
        FileInfo* fileInfo = *it;
		ParseSubject(fileInfo, true);
	}

	if (HasDuplicateFilenames())
    {
		for (FileList::iterator it = m_nzbInfo->GetFileList()->begin(); it != m_nzbInfo->GetFileList()->end(); it++)
		{
			FileInfo* fileInfo = *it;
			ParseSubject(fileInfo, false);
		}
	}

	if (HasDuplicateFilenames())
    {
		m_nzbInfo->SetManyDupeFiles(true);
		for (FileList::iterator it = m_nzbInfo->GetFileList()->begin(); it != m_nzbInfo->GetFileList()->end(); it++)
		{
			FileInfo* fileInfo = *it;
			fileInfo->SetFilename(fileInfo->GetSubject());
		}
    }
}

bool CompareFileInfo(FileInfo* first, FileInfo* second)
{
	return strcmp(first->GetFilename(), second->GetFilename()) > 0;
}

void NzbFile::CalcHashes()
{
	TempFileList fileList;

	for (FileList::iterator it = m_nzbInfo->GetFileList()->begin(); it != m_nzbInfo->GetFileList()->end(); it++)
	{
		fileList.push_back(*it);
	}

	fileList.sort(CompareFileInfo);

	unsigned int fullContentHash = 0;
	unsigned int filteredContentHash = 0;
	int useForFilteredCount = 0;

	for (TempFileList::iterator it = fileList.begin(); it != fileList.end(); it++)
	{
		FileInfo* fileInfo = *it;

		// check file extension
		bool skip = !fileInfo->GetParFile() &&
			Util::MatchFileExt(fileInfo->GetFilename(), g_pOptions->GetExtCleanupDisk(), ",;");

		for (FileInfo::Articles::iterator it = fileInfo->GetArticles()->begin(); it != fileInfo->GetArticles()->end(); it++)
		{
			ArticleInfo* article = *it;
			int len = strlen(article->GetMessageId());
			fullContentHash = Util::HashBJ96(article->GetMessageId(), len, fullContentHash);
			if (!skip)
			{
				filteredContentHash = Util::HashBJ96(article->GetMessageId(), len, filteredContentHash);
				useForFilteredCount++;
			}
		}
	}

	// if filtered hash is based on less than a half of files - do not use filtered hash at all
	if (useForFilteredCount < (int)fileList.size() / 2)
	{
		filteredContentHash = 0;
	}

	m_nzbInfo->SetFullContentHash(fullContentHash);
	m_nzbInfo->SetFilteredContentHash(filteredContentHash);
}

void NzbFile::ProcessFiles()
{
	BuildFilenames();

	for (FileList::iterator it = m_nzbInfo->GetFileList()->begin(); it != m_nzbInfo->GetFileList()->end(); it++)
	{
		FileInfo* fileInfo = *it;
		fileInfo->MakeValidFilename();

		char loFileName[1024];
		strncpy(loFileName, fileInfo->GetFilename(), 1024);
		loFileName[1024-1] = '\0';
		for (char* p = loFileName; *p; p++) *p = tolower(*p); // convert string to lowercase
		bool parFile = strstr(loFileName, ".par2");

		m_nzbInfo->SetFileCount(m_nzbInfo->GetFileCount() + 1);
		m_nzbInfo->SetTotalArticles(m_nzbInfo->GetTotalArticles() + fileInfo->GetTotalArticles());
		m_nzbInfo->SetSize(m_nzbInfo->GetSize() + fileInfo->GetSize());
		m_nzbInfo->SetRemainingSize(m_nzbInfo->GetRemainingSize() + fileInfo->GetRemainingSize());
		m_nzbInfo->SetFailedSize(m_nzbInfo->GetFailedSize() + fileInfo->GetMissedSize());
		m_nzbInfo->SetCurrentFailedSize(m_nzbInfo->GetFailedSize());

		fileInfo->SetParFile(parFile);
		if (parFile)
		{
			m_nzbInfo->SetParSize(m_nzbInfo->GetParSize() + fileInfo->GetSize());
			m_nzbInfo->SetParFailedSize(m_nzbInfo->GetParFailedSize() + fileInfo->GetMissedSize());
			m_nzbInfo->SetParCurrentFailedSize(m_nzbInfo->GetParFailedSize());
			m_nzbInfo->SetRemainingParCount(m_nzbInfo->GetRemainingParCount() + 1);
		}
	}

	m_nzbInfo->UpdateMinMaxTime();

	CalcHashes();

	if (g_pOptions->GetSaveQueue() && g_pOptions->GetServerMode())
	{
		for (FileList::iterator it = m_nzbInfo->GetFileList()->begin(); it != m_nzbInfo->GetFileList()->end(); it++)
		{
			FileInfo* fileInfo = *it;
			g_pDiskState->SaveFile(fileInfo);
			fileInfo->ClearArticles();
		}
	}

	if (m_password)
	{
		ReadPassword();
	}
}

/**
 * Password read using XML-parser may have special characters (such as TAB) stripped.
 * This function rereads password directly from file to keep all characters intact.
 */
void NzbFile::ReadPassword()
{
    FILE* file = fopen(m_fileName, FOPEN_RB);
    if (!file)
    {
        return;
    }

    // obtain file size.
    fseek(file , 0 , SEEK_END);
    int size  = (int)ftell(file);
    rewind(file);

	// reading first 4KB of the file

    // allocate memory to contain the whole file.
    char* buf = (char*)malloc(4096);

	size = size < 4096 ? size : 4096;

    // copy the file into the buffer.
    fread(buf, 1, size, file);

    fclose(file);

    buf[size-1] = '\0';

	char* metaPassword = strstr(buf, "<meta type=\"password\">");
	if (metaPassword)
	{
		metaPassword += 22; // length of '<meta type="password">'
		char* end = strstr(metaPassword, "</meta>");
		if (end)
		{
			*end = '\0';
			WebUtil::XmlDecode(metaPassword);
			free(m_password);
			m_password = strdup(metaPassword);
		}
	}

	free(buf);
}

#ifdef WIN32
bool NzbFile::Parse()
{
    CoInitialize(NULL);

	HRESULT hr;

	MSXML::IXMLDOMDocumentPtr doc;
	hr = doc.CreateInstance(MSXML::CLSID_DOMDocument);
    if (FAILED(hr))
    {
        return false;
    }

    // Load the XML document file...
	doc->put_resolveExternals(VARIANT_FALSE);
	doc->put_validateOnParse(VARIANT_FALSE);
	doc->put_async(VARIANT_FALSE);

	_variant_t vFilename(m_fileName);

	// 1. first trying to load via filename without URL-encoding (certain charaters doesn't work when encoded)
	VARIANT_BOOL success = doc->load(vFilename);
	if (success == VARIANT_FALSE)
	{
		// 2. now trying filename encoded as URL
		char url[2048];
		EncodeUrl(m_fileName, url, 2048);
		debug("url=\"%s\"", url);
		_variant_t vUrl(url);

		success = doc->load(vUrl);
	}

	if (success == VARIANT_FALSE)
	{
		_bstr_t r(doc->GetparseError()->reason);
		const char* errMsg = r;

		char messageText[1024];
		snprintf(messageText, 1024, "Error parsing nzb-file %s: %s", Util::BaseFileName(m_fileName), errMsg);
		messageText[1024-1] = '\0';
		m_nzbInfo->AddMessage(Message::mkError, messageText);

		return false;
	}

    if (!ParseNzb(doc))
	{
		return false;
	}

	if (GetNzbInfo()->GetFileList()->empty())
	{
		char messageText[1024];
		snprintf(messageText, 1024, "Error parsing nzb-file %s: file has no content", Util::BaseFileName(m_fileName));
		messageText[1024-1] = '\0';
		m_nzbInfo->AddMessage(Message::mkError, messageText);

		return false;
	}

	ProcessFiles();

    return true;
}

void NzbFile::EncodeUrl(const char* filename, char* url, int bufLen)
{
	char utfFilename[2048];
	strncpy(utfFilename, filename, 2048);
	utfFilename[2048-1] = '\0';
	WebUtil::AnsiToUtf8(utfFilename, 2048);

	char* end = url + bufLen;
	for (char* p = utfFilename; *p && url < end - 3; p++)
	{
		char ch = *p;
		if (('0' <= ch && ch <= '9') ||
			('a' <= ch && ch <= 'z') ||
			('A' <= ch && ch <= 'Z') ||
			ch == '-' || ch == '.' || ch == '_' || ch == '~')
		{
			*url++ = ch;
		}
		else
		{
			*url++ = '%';
			int a = (unsigned char)ch >> 4;
			*url++ = a > 9 ? a - 10 + 'A' : a + '0';
			a = ch & 0xF;
			*url++ = a > 9 ? a - 10 + 'A' : a + '0';
		}
	}
	*url = NULL;
}

bool NzbFile::ParseNzb(IUnknown* nzb)
{
	MSXML::IXMLDOMDocumentPtr doc = nzb;
	MSXML::IXMLDOMNodePtr root = doc->documentElement;

	MSXML::IXMLDOMNodePtr node = root->selectSingleNode("/nzb/head/meta[@type='password']");
	if (node)
	{
		_bstr_t password(node->Gettext());
		m_password = strdup(password);
	}

	MSXML::IXMLDOMNodeListPtr fileList = root->selectNodes("/nzb/file");
	for (int i = 0; i < fileList->Getlength(); i++)
	{
		node = fileList->Getitem(i);
		MSXML::IXMLDOMNodePtr attribute = node->Getattributes()->getNamedItem("subject");
		if (!attribute) return false;
		_bstr_t subject(attribute->Gettext());
        FileInfo* fileInfo = new FileInfo();
		fileInfo->SetSubject(subject);

		attribute = node->Getattributes()->getNamedItem("date");
		if (attribute)
		{
			_bstr_t date(attribute->Gettext());
			fileInfo->SetTime(atoi(date));
		}

		MSXML::IXMLDOMNodeListPtr groupList = node->selectNodes("groups/group");
		for (int g = 0; g < groupList->Getlength(); g++)
		{
			MSXML::IXMLDOMNodePtr node = groupList->Getitem(g);
			_bstr_t group = node->Gettext();
			fileInfo->GetGroups()->push_back(strdup((const char*)group));
		}

		MSXML::IXMLDOMNodeListPtr segmentList = node->selectNodes("segments/segment");
		for (int g = 0; g < segmentList->Getlength(); g++)
		{
			MSXML::IXMLDOMNodePtr node = segmentList->Getitem(g);
			_bstr_t bid = node->Gettext();
            char id[2048];
            snprintf(id, 2048, "<%s>", (const char*)bid);

			MSXML::IXMLDOMNodePtr attribute = node->Getattributes()->getNamedItem("number");
			if (!attribute) return false;
			_bstr_t number(attribute->Gettext());

			attribute = node->Getattributes()->getNamedItem("bytes");
			if (!attribute) return false;
			_bstr_t bytes(attribute->Gettext());

			int partNumber = atoi(number);
			int lsize = atoi(bytes);

			if (partNumber > 0)
			{
				ArticleInfo* article = new ArticleInfo();
				article->SetPartNumber(partNumber);
				article->SetMessageId(id);
				article->SetSize(lsize);
				AddArticle(fileInfo, article);
			}
		}

		AddFileInfo(fileInfo);
	}
	return true;
}

#else

bool NzbFile::Parse()
{
	xmlSAXHandler SAX_handler = {0};
	SAX_handler.startElement = reinterpret_cast<startElementSAXFunc>(SAX_StartElement);
	SAX_handler.endElement = reinterpret_cast<endElementSAXFunc>(SAX_EndElement);
	SAX_handler.characters = reinterpret_cast<charactersSAXFunc>(SAX_characters);
	SAX_handler.error = reinterpret_cast<errorSAXFunc>(SAX_error);
	SAX_handler.getEntity = reinterpret_cast<getEntitySAXFunc>(SAX_getEntity);

	m_ignoreNextError = false;

	int ret = xmlSAXUserParseFile(&SAX_handler, this, m_fileName);
    
    if (ret != 0)
	{
		char messageText[1024];
		snprintf(messageText, 1024, "Error parsing nzb-file %s", Util::BaseFileName(m_fileName));
		messageText[1024-1] = '\0';
		m_nzbInfo->AddMessage(Message::mkError, messageText);
		return false;
	}

	if (m_nzbInfo->GetFileList()->empty())
	{
		char messageText[1024];
		snprintf(messageText, 1024, "Error parsing nzb-file %s: file has no content", Util::BaseFileName(m_fileName));
		messageText[1024-1] = '\0';
		m_nzbInfo->AddMessage(Message::mkError, messageText);
		return false;
	}

	ProcessFiles();

	return true;
}

void NzbFile::Parse_StartElement(const char *name, const char **atts)
{
	char tagAttrMessage[1024];
	snprintf(tagAttrMessage, 1024, "Malformed nzb-file, tag <%s> must have attributes", name);
	tagAttrMessage[1024-1] = '\0';

	if (m_tagContent)
	{
		free(m_tagContent);
		m_tagContent = NULL;
		m_tagContentLen = 0;
	}
	
	if (!strcmp("file", name))
	{
		m_fileInfo = new FileInfo();
		m_fileInfo->SetFilename(m_fileName);

		if (!atts)
		{
	        m_nzbInfo->AddMessage(Message::mkWarning, tagAttrMessage);
			return;
		}

    	for (int i = 0; atts[i]; i += 2)
    	{
    		const char* attrname = atts[i];
    		const char* attrvalue = atts[i + 1];
			if (!strcmp("subject", attrname))
			{
				m_fileInfo->SetSubject(attrvalue);
			}
			if (!strcmp("date", attrname))
			{
				m_fileInfo->SetTime(atoi(attrvalue));
			}
		}
	}
	else if (!strcmp("segment", name))
	{
		if (!m_fileInfo)
		{
			m_nzbInfo->AddMessage(Message::mkWarning, "Malformed nzb-file, tag <segment> without tag <file>");
			return;
		}

		if (!atts)
		{
			m_nzbInfo->AddMessage(Message::mkWarning, tagAttrMessage);
			return;
		}

		long long lsize = -1;
		int partNumber = -1;

    	for (int i = 0; atts[i]; i += 2)
    	{
    		const char* attrname = atts[i];
    		const char* attrvalue = atts[i + 1];
			if (!strcmp("bytes", attrname))
			{
				lsize = atol(attrvalue);
			}
			if (!strcmp("number", attrname))
			{
				partNumber = atol(attrvalue);
			}
		}

		if (partNumber > 0)
		{
			// new segment, add it!
			m_article = new ArticleInfo();
			m_article->SetPartNumber(partNumber);
			m_article->SetSize(lsize);
			AddArticle(m_fileInfo, m_article);
		}
	}
	else if (!strcmp("meta", name))
	{
		if (!atts)
		{
			m_nzbInfo->AddMessage(Message::mkWarning, tagAttrMessage);
			return;
		}
		m_hasPassword = atts[0] && atts[1] && !strcmp("type", atts[0]) && !strcmp("password", atts[1]);
	}
}

void NzbFile::Parse_EndElement(const char *name)
{
	if (!strcmp("file", name))
	{
		// Close the file element, add the new file to file-list
		AddFileInfo(m_fileInfo);
		m_fileInfo = NULL;
		m_article = NULL;
	}
	else if (!strcmp("group", name))
	{
		if (!m_fileInfo)
		{
			// error: bad nzb-file
			return;
		}
		
		m_fileInfo->GetGroups()->push_back(m_tagContent);
		m_tagContent = NULL;
		m_tagContentLen = 0;
	}
	else if (!strcmp("segment", name))
	{
		if (!m_fileInfo || !m_article)
		{
			// error: bad nzb-file
			return;
		}

		// Get the #text part
		char ID[2048];
		snprintf(ID, 2048, "<%s>", m_tagContent);
		m_article->SetMessageId(ID);
		m_article = NULL;
	}
	else if (!strcmp("meta", name) && m_hasPassword)
	{
		m_password = strdup(m_tagContent);
	}
}

void NzbFile::Parse_Content(const char *buf, int len)
{
	m_tagContent = (char*)realloc(m_tagContent, m_tagContentLen + len + 1);
	strncpy(m_tagContent + m_tagContentLen, buf, len);
	m_tagContentLen += len;
	m_tagContent[m_tagContentLen] = '\0';
}

void NzbFile::SAX_StartElement(NzbFile* file, const char *name, const char **atts)
{
	file->Parse_StartElement(name, atts);
}

void NzbFile::SAX_EndElement(NzbFile* file, const char *name)
{
	file->Parse_EndElement(name);
}

void NzbFile::SAX_characters(NzbFile* file, const char * xmlstr, int len)
{
	char* str = (char*)xmlstr;
	
	// trim starting blanks
	int off = 0;
	for (int i = 0; i < len; i++)
	{
		char ch = str[i];
		if (ch == ' ' || ch == 10 || ch == 13 || ch == 9)
		{
			off++;
		}
		else
		{
			break;
		}
	}
	
	int newlen = len - off;
	
	// trim ending blanks
	for (int i = len - 1; i >= off; i--)
	{
		char ch = str[i];
		if (ch == ' ' || ch == 10 || ch == 13 || ch == 9)
		{
			newlen--;
		}
		else
		{
			break;
		}
	}
	
	if (newlen > 0)
	{
		// interpret tag content
		file->Parse_Content(str + off, newlen);
	}
}

void* NzbFile::SAX_getEntity(NzbFile* file, const char * name)
{
	xmlEntityPtr e = xmlGetPredefinedEntity((xmlChar* )name);
	if (!e)
	{
		file->GetNzbInfo()->AddMessage(Message::mkWarning, "entity not found");
		file->m_ignoreNextError = true;
	}

	return e;
}

void NzbFile::SAX_error(NzbFile* file, const char *msg, ...)
{
	if (file->m_ignoreNextError)
	{
		file->m_ignoreNextError = false;
		return;
	}
	
    va_list argp;
    va_start(argp, msg);
    char errMsg[1024];
    vsnprintf(errMsg, sizeof(errMsg), msg, argp);
    errMsg[1024-1] = '\0';
    va_end(argp);

	// remove trailing CRLF
	for (char* pend = errMsg + strlen(errMsg) - 1; pend >= errMsg && (*pend == '\n' || *pend == '\r' || *pend == ' '); pend--) *pend = '\0';

	char textMessage[1024];
	snprintf(textMessage, 1024, "Error parsing nzb-file: %s", errMsg);
	textMessage[1024-1] = '\0';
	file->GetNzbInfo()->AddMessage(Message::mkError, textMessage);
}
#endif