解析FTP LIST指令傳回的目錄清單

有個程式要分析FTP伺服器傳回的目錄清單，本來以為比較簡單，也在網上查了幾個文章，可都是一知半解的。于是下載下傳了Filezilla的源代碼，她的源檔案

directorylistingparser.h

directorylistingparser.cpp

就是解析目錄清單的，有同樣需求的不妨看一看，還是挺費事的，不同平台要都要特殊處理。我把頭檔案貼出來：

#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

  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

本文轉自 h2appy  51CTO部落格，原文連結：http://blog.51cto.com/h2appy/122279，如需轉載請自行聯系原作者