xref: /aoo41x/main/sal/osl/unx/file_path_helper.cxx (revision 87d2adbc)

/**************************************************************
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 *************************************************************/



// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_sal.hxx"

 /*******************************************
 	Includes
  ******************************************/

 #ifndef _OSL_FILE_PATH_HELPER_H_
 #include "file_path_helper.h"
 #endif

 #ifndef _OSL_FILE_PATH_HELPER_HXX_
 #include "file_path_helper.hxx"
 #endif

 #ifndef _OSL_UUNXAPI_HXX_
 #include "uunxapi.hxx"
 #endif

 #ifndef _OSL_DIAGNOSE_H_
 #include <osl/diagnose.h>
 #endif

 #ifndef _RTL_USTRING_HXX_
 #include <rtl/ustring.hxx>
 #endif

 /*******************************************
 	Constants
  ******************************************/

  const sal_Unicode FPH_CHAR_PATH_SEPARATOR = (sal_Unicode)'/';
  const sal_Unicode FPH_CHAR_DOT            = (sal_Unicode)'.';
  const sal_Unicode FPH_CHAR_COLON          = (sal_Unicode)':';

  inline const rtl::OUString FPH_PATH_SEPARATOR()
      { return rtl::OUString::createFromAscii("/"); }
  inline const rtl::OUString FPH_LOCAL_DIR_ENTRY()
      { return rtl::OUString::createFromAscii("."); }
  inline const rtl::OUString FPH_PARENT_DIR_ENTRY()
      { return rtl::OUString::createFromAscii(".."); }

 /*******************************************
  *  osl_systemPathRemoveSeparator
  ******************************************/

 void SAL_CALL osl_systemPathRemoveSeparator(rtl_uString* pustrPath)
 {
 	OSL_PRECOND(0 != pustrPath, "osl_systemPathRemoveSeparator: Invalid parameter");
    if (0 != pustrPath)
    {
        // maybe there are more than one separator at end
        // so we run in a loop
        while ((pustrPath->length > 1) && (FPH_CHAR_PATH_SEPARATOR == pustrPath->buffer[pustrPath->length - 1]))
        {
            pustrPath->length--;
            pustrPath->buffer[pustrPath->length] = (sal_Unicode)'\0';
        }

        OSL_POSTCOND((0 == pustrPath->length) || (1 == pustrPath->length) || \
                     (pustrPath->length > 1 && pustrPath->buffer[pustrPath->length - 1] != FPH_CHAR_PATH_SEPARATOR), \
                     "osl_systemPathRemoveSeparator: Post condition failed");
    }
 }

 /*******************************************
    osl_systemPathEnsureSeparator
  ******************************************/

 void SAL_CALL osl_systemPathEnsureSeparator(rtl_uString** ppustrPath)
 {
     OSL_PRECOND((0 != ppustrPath) && (0 != *ppustrPath), "osl_systemPathEnsureSeparator: Invalid parameter");
     if ((0 != ppustrPath) && (0 != *ppustrPath))
     {
         rtl::OUString path(*ppustrPath);
         sal_Int32	  lp = path.getLength();
         sal_Int32    i  = path.lastIndexOf(FPH_CHAR_PATH_SEPARATOR);

         if ((lp > 1 && i != (lp - 1)) || ((lp < 2) && i < 0))
         {
             path += FPH_PATH_SEPARATOR();
             rtl_uString_assign(ppustrPath, path.pData);
         }

         OSL_POSTCOND(path.lastIndexOf(FPH_CHAR_PATH_SEPARATOR) == (path.getLength() - 1), \
                      "osl_systemPathEnsureSeparator: Post condition failed");
     }
 }

 /*******************************************
  *  osl_systemPathIsRelativePath
  ******************************************/

 sal_Bool SAL_CALL osl_systemPathIsRelativePath(const rtl_uString* pustrPath)
 {
     OSL_PRECOND(0 != pustrPath, "osl_systemPathIsRelativePath: Invalid parameter");
     return ((0 == pustrPath) || (0 == pustrPath->length) || (pustrPath->buffer[0] != FPH_CHAR_PATH_SEPARATOR));
 }

 /******************************************
    osl_systemPathMakeAbsolutePath
  *****************************************/

 void SAL_CALL osl_systemPathMakeAbsolutePath(
 	const rtl_uString* pustrBasePath,
	const rtl_uString* pustrRelPath,
	rtl_uString** 	   ppustrAbsolutePath)
{
	rtl::OUString base(rtl_uString_getStr(const_cast<rtl_uString*>(pustrBasePath)));
	rtl::OUString rel(const_cast<rtl_uString*>(pustrRelPath));

	if (base.getLength() > 0)
		osl_systemPathEnsureSeparator(&base.pData);

	base += rel;

	rtl_uString_acquire(base.pData);
	*ppustrAbsolutePath = base.pData;
}


 /*******************************************
 	osl_systemPathGetFileOrLastDirectoryPart
  ******************************************/

 void SAL_CALL osl_systemPathGetFileNameOrLastDirectoryPart(
 	const rtl_uString* 	pustrPath,
	rtl_uString** 		ppustrFileNameOrLastDirPart)
{
	OSL_PRECOND(pustrPath && ppustrFileNameOrLastDirPart, \
			    "osl_systemPathGetFileNameOrLastDirectoryPart: Invalid parameter");

	rtl::OUString path(const_cast<rtl_uString*>(pustrPath));

	osl_systemPathRemoveSeparator(path.pData);

	rtl::OUString last_part;

	if (path.getLength() > 1 || (1 == path.getLength() && *path.getStr() != FPH_CHAR_PATH_SEPARATOR))
	{
		sal_Int32 idx_ps = path.lastIndexOf(FPH_CHAR_PATH_SEPARATOR);
		idx_ps++; // always right to increment by one even if idx_ps == -1!
		last_part = rtl::OUString(path.getStr() + idx_ps);
	}
	rtl_uString_assign(ppustrFileNameOrLastDirPart, last_part.pData);
}


 /********************************************
 	osl_systemPathIsHiddenFileOrDirectoryEntry
 *********************************************/

 sal_Bool SAL_CALL osl_systemPathIsHiddenFileOrDirectoryEntry(
 	const rtl_uString* pustrPath)
{
	OSL_PRECOND(0 != pustrPath, "osl_systemPathIsHiddenFileOrDirectoryEntry: Invalid parameter");
    if ((0 == pustrPath) || (0 == pustrPath->length))
        return sal_False;

    rtl::OUString fdp;
    osl_systemPathGetFileNameOrLastDirectoryPart(pustrPath, &fdp.pData);

    return ((fdp.pData->length > 0) &&
            (fdp.pData->buffer[0] == FPH_CHAR_DOT) &&
            !osl_systemPathIsLocalOrParentDirectoryEntry(fdp.pData));
}


 /************************************************
 	osl_systemPathIsLocalOrParentDirectoryEntry
 ************************************************/

sal_Bool SAL_CALL osl_systemPathIsLocalOrParentDirectoryEntry(
	const rtl_uString* pustrPath)
{
	OSL_PRECOND(pustrPath, "osl_systemPathIsLocalOrParentDirectoryEntry: Invalid parameter");

	rtl::OUString dirent;

	osl_systemPathGetFileNameOrLastDirectoryPart(pustrPath, &dirent.pData);

	return (
	        (dirent == FPH_LOCAL_DIR_ENTRY()) ||
	        (dirent == FPH_PARENT_DIR_ENTRY())
	       );
}

/***********************************************
 Simple iterator for a path list separated by
 the specified character
 **********************************************/

class path_list_iterator
{
public:

	/******************************************
 	 constructor

	 after construction get_current_item
	 returns the first path in list, no need
	 to call reset first
	 *****************************************/
	path_list_iterator(const rtl::OUString& path_list, sal_Unicode list_separator = FPH_CHAR_COLON) :
		m_path_list(path_list),
		m_end(m_path_list.getStr() + m_path_list.getLength() + 1),
		m_separator(list_separator)
	{
		reset();
	}

	/******************************************
	 reset the iterator
	 *****************************************/
	void reset()
	{
		m_path_segment_begin = m_path_segment_end = m_path_list.getStr();
		advance();
	}

	/******************************************
	 move the iterator to the next position
	 *****************************************/
	void next()
	{
		OSL_PRECOND(!done(), "path_list_iterator: Already done!");

		m_path_segment_begin = ++m_path_segment_end;
		advance();
	}

	/******************************************
	 check if done
	 *****************************************/
	bool done() const
	{
		return (m_path_segment_end >= m_end);
	}

	/******************************************
	 return the current item
	 *****************************************/
	rtl::OUString get_current_item() const
	{
		return rtl::OUString(
			m_path_segment_begin,
			(m_path_segment_end - m_path_segment_begin));
	}

private:

	/******************************************
	 move m_path_end to the next separator or
	 to the edn of the string
	 *****************************************/
	void advance()
	{
		while (!done() && *m_path_segment_end && (*m_path_segment_end != m_separator))
			++m_path_segment_end;

		OSL_ASSERT(m_path_segment_end <= m_end);
	}

private:
	rtl::OUString 		m_path_list;
	const sal_Unicode*  m_end;
	const sal_Unicode 	m_separator;
	const sal_Unicode*  m_path_segment_begin;
	const sal_Unicode*  m_path_segment_end;

// prevent copy and assignment
private:
	/******************************************
	 copy constructor
	 remember: do not simply copy m_path_begin
	 and m_path_end because they point to
	 the memory of other.m_path_list!
	 *****************************************/
	path_list_iterator(const path_list_iterator& other);

	/******************************************
	 assignment operator
 	 remember: do not simply copy m_path_begin
	 and m_path_end because they point to
	 the memory of other.m_path_list!
	 *****************************************/
	path_list_iterator& operator=(const path_list_iterator& other);
};

 /************************************************
  	osl_searchPath
  ***********************************************/

sal_Bool SAL_CALL osl_searchPath(
 	const rtl_uString* pustrFilePath,
	const rtl_uString* pustrSearchPathList,
	rtl_uString**      ppustrPathFound)
{
	OSL_PRECOND(pustrFilePath && pustrSearchPathList && ppustrPathFound, "osl_searchPath: Invalid parameter");

	bool               bfound = false;
	rtl::OUString      fp(const_cast<rtl_uString*>(pustrFilePath));
	rtl::OUString      pl = rtl::OUString(const_cast<rtl_uString*>(pustrSearchPathList));
	path_list_iterator pli(pl);

	while (!pli.done())
	{
		rtl::OUString p = pli.get_current_item();
		osl::systemPathEnsureSeparator(p);
		p += fp;

		if (osl::access(p, F_OK) > -1)
		{
			bfound = true;
			rtl_uString_assign(ppustrPathFound, p.pData);
			break;
		}
		pli.next();
	}
	return bfound;
}