解析FTP LIST命令返回的目录列表

有个程序要分析FTP服务器返回的目录列表，本来以为比较简单，也在网上查了几个帖子，可都是一知半解的。于是下载了Filezilla的源代码，她的源文件
directorylistingparser.h
directorylistingparser.cpp
就是解析目录列表的，有同样需求的不妨看一看，还是挺费事的，不同平台要都要特殊处理。我把头文件贴出来：


#ifndef __DIRECTORYLISTINGPARSER_H__


#define __DIRECTORYLISTINGPARSER_H__



/* This class is responsible for parsing the directory listings returned by


* the server.


* Unfortunatly, RFC959 did not specify the format of directory listings, so


* each server uses its own format. In addition to that, in most cases the


* listings were not designed to be machine-parsable, they were meant to be


* human readable by users of that particular server.


* By far the most common format is the one returned by the Unix "ls -l"


* command. However, legacy systems are still in place, especially in big


* companies. These often use very exotic listing styles.


* Another problem are localized listings containing date strings. In some


* cases these listings are ambiguous and cannot be distinguished.


* Example for an ambiguous date: 04-05-06. All of the 6 permutations for


* the location of year, month and day are valid dates.


* Some servers send multiline listings where a single entry can span two


* lines, this has to be detected as well, as far as possible.


*


* Some servers send MVS style listings which can consist of just the


* filename without any additional data. In order to prevent problems, this


* format is only parsed if the server is in fact recognizes as MVS server.


*


* Please see tests/dirparsertest.cpp for a list of supported formats and the


* expected parser result.


*


* If adding data to the parser, it first decomposes the raw data into lines,


* which then are processed further. Each line gets consecutively tested for


* different formats, starting with the most common Unix style format.


* Lines not containing a recognized format (e.g. a part of a multiline


* entry) are rememberd and if the next line cannot be parsed either, they


* get concatenated to be parsed again (and discarded if not recognized).


*/



class CLine;


class CToken;


class CControlSocket;


class CDirectoryListingParser


{


public:


CDirectoryListingParser(CControlSocket* pControlSocket, const CServer& server);


~CDirectoryListingParser();



CDirectoryListing Parse(const CServerPath &path);



void AddData(char *pData, int len);


void AddLine(const wxChar* pLine);



void Reset();



void SetTimezoneOffset(const wxTimeSpan& span) { m_timezoneOffset = span; }



void SetServer(const CServer& server) { m_server = server; };



protected:


CLine *GetLine(bool breakAtEnd = false);



void ParseData(bool partial);



bool ParseLine(CLine *pLine, const enum ServerType serverType, bool concatenated);



bool ParseAsUnix(CLine *pLine, CDirentry &entry, bool expect_date);


bool ParseAsDos(CLine *pLine, CDirentry &entry);


bool ParseAsEplf(CLine *pLine, CDirentry &entry);


bool ParseAsVms(CLine *pLine, CDirentry &entry);


bool ParseAsIbm(CLine *pLine, CDirentry &entry);


bool ParseOther(CLine *pLine, CDirentry &entry);


bool ParseAsWfFtp(CLine *pLine, CDirentry &entry);


bool ParseAsIBM_MVS(CLine *pLine, CDirentry &entry);


bool ParseAsIBM_MVS_PDS(CLine *pLine, CDirentry &entry);


bool ParseAsIBM_MVS_PDS2(CLine *pLine, CDirentry &entry);


bool ParseAsIBM_MVS_Migrated(CLine *pLine, CDirentry &entry);


bool ParseAsMlsd(CLine *pLine, CDirentry &entry);


bool ParseAsOS9(CLine *pLine, CDirentry &entry);




// Only call this if servertype set to ZVM since it conflicts


// with other formats.


bool ParseAsZVM(CLine *pLine, CDirentry &entry);



// Only call this if servertype set to HPNONSTOP since it conflicts


// with other formats.


bool ParseAsHPNonstop(CLine *pLine, CDirentry &entry);



// Date / time parsers


bool ParseUnixDateTime(CLine *pLine, int &index, CDirentry &entry);


bool ParseShortDate(CToken &token, CDirentry &entry, bool saneFieldOrder = false);


bool ParseTime(CToken &token, CDirentry &entry);



// Parse file sizes given like this: 123.4M


bool ParseComplexFileSize(CToken& token, wxLongLong& size, int blocksize = -1);



bool GetMonthFromName(const wxString& name, int &month);



CControlSocket* m_pControlSocket;



static std::map<wxString, int> m_MonthNamesMap;




struct t_list


{


char *p;


int len;


};


int m_currentOffset;



std::list<t_list> m_DataList;


std::list<CDirentry> m_entryList;



CLine *m_prevLine;



CServer m_server;



bool m_fileListOnly;


std::list<wxString> m_fileList;




bool m_maybeMultilineVms;



wxTimeSpan m_timezoneOffset;


};



#endif

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