imgtools/romtools/rofsbuild/fsnode.cpp
author Zheng Shen <zheng.shen@nokia.com>
Wed, 13 Oct 2010 16:27:55 +0800
changeset 647 53d1ab72f5bc
parent 617 3a747a240983
child 675 02e65118a746
permissions -rw-r--r--
ROM Tools 13.1.0.4
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/*
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* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of the License "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description: 
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*
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*/
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#include "fsnode.h"
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#include "fatdefines.h"
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#include "utf16string.h"
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#include <stdio.h> 
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#include <iostream>
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#include <iomanip>
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#include <stdio.h> 
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#include <stdlib.h> 
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#include <ctype.h> 
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using namespace std;
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const TUint KBytesPerEntry = 13 ;
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static inline bool is_a_long_file_name_char(unsigned char ch){
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	return ( ch >= ' ' && ch != '"' && ch != '*' && ch != ':' && ch != '<' \
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		&& ch != '>' && ch != '?' && ch != '|' && ch != 127) ; 
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}
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//
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TFSNode::TFSNode(TFSNode* aParent, const char* aFileName, TUint8 aAttrs, const char* aPCSideName)  :
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iParent(aParent),iFirstChild(0),iSibling(0),iAttrs(aAttrs), iPCSideName(0), iWideName(0){
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  // According to the FAT specification, short name should be inited with empty string (' ' string)
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	memset(iShortName,0x20,11);  
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	iShortName[11] = 0 ; 
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	if(aFileName) {
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		const unsigned char* ptr = reinterpret_cast<const unsigned char*>(aFileName);
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		bool allSpaces = true ;
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		while(*ptr){
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			if( !is_a_long_file_name_char(*ptr))
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				throw "Illegal filename or dir name! \n";		
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			if(*ptr != ' ')
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				allSpaces = false ;		
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			ptr++ ;
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		}
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		if(allSpaces)
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			throw "Illegal filename or dir name(all spaces)!\n";
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		iFileName = strdup(aFileName); 
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		GenerateBasicName() ;	
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	} 
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	if(aPCSideName) {
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		iPCSideName = strdup(aPCSideName);
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	}
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	iFATEntry = 0;
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	iCrtTimeTenth  = 0;
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	iCrtTime.iImageTime = 0 ;
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	iCrtDate.iImageDate = 0 ;
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	iLstAccDate.iImageDate = 0  ;
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	iWrtTime.iImageTime = 0 ;
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	iWrtDate.iImageDate = 0  ;
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	iFileSize = 0;
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	if(!iParent) return ;
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	if(!iParent->iFirstChild)
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	    iParent->iFirstChild = this ;
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    else {
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        TFSNode* sibling = iParent->iFirstChild;
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        while(sibling->iSibling)
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            sibling = sibling->iSibling ;
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        sibling->iSibling = this ;
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    } 
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}
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TFSNode::~TFSNode(){
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	if(iFirstChild)
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		delete iFirstChild ;
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	if(iSibling)
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		delete iSibling ;
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	if(iFileName)
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		free(iFileName) ;
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	if(iWideName)
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		delete iWideName;
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	if(iPCSideName)
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		free(iPCSideName);
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}
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/** GenerateBasicName : Generate the short name according to long name 
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	* 
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	* algorithm :
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	* 
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	* 1.	The UNICODE name passed to the file system is converted to upper case.
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	* 2.	The upper cased UNICODE name is converted to OEM.
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	*     if (the uppercased UNICODE glyph does not exist as an OEM glyph in the OEM code page)
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	*				or	(the OEM glyph is invalid in an 8.3 name)
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	*			{
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	*				Replace the glyph to an OEM '_' (underscore) character.
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	*				Set a "lossy conversion" flag.
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	*			}
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	* 3.	Strip all leading and embedded spaces from the long name.
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	* 4.	Strip all leading periods from the long name.
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	* 5.	While		(not at end of the long name)
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	*					and	(char is not a period)
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	*					and	(total chars copied < 8)
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	*			{
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	*				Copy characters into primary portion of the basis name
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	*			}
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	*	6.	Insert a dot at the end of the primary components of the basis-name 
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	*     if the basis name has an extension after the last period in the name.
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	*
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	* 7.	Scan for the last embedded period in the long name.
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	*     If	(the last embedded period was found)
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	*     {
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	*     	While		(not at end of the long name) and	(total chars copied < 3)
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	*     	{
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	*     		Copy characters into extension portion of the basis name
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	*     	}
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	*     }
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  *
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  */
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void TFSNode::GenerateBasicName() { 
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	const char* filename =  iFileName ;	 
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	TUint length = strlen(filename);
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	if(0 == length)
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	    return ;
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	if(0 == strcmp(filename,".")){
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        iShortName[0] = '.' ;
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        return ;
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	}
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	if(0 == strcmp(filename,"..")){
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        iShortName[0] = '.' ;
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        iShortName[1] = '.' ;
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        return ;
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	} 
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	iWideName = new UTF16String(filename,length); // The unicode string
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	char base[10];
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	const char* ext = filename + length;
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	//Strip all leading periods and spaces from the long name.
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	while(*filename == '.' || *filename == ' ' || *filename == '\t') {
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		filename ++ ;
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		length -- ;
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	}
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	//find the extension
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	while(ext > filename && *ext != '.')
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		ext -- ;
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	if(ext == filename){
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		ext = "" ; 
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	}
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	else {
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		length = ext - filename;
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		ext ++ ;
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	} 
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	bool lossyConv = false ;
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	TUint bl = 0;
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	for(TUint i = 0 ; i < length ; i++) {
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		if(filename[i] >= 'a' && filename[i] <= 'z')
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			base[bl++] = filename[i] + 'A' - 'a';
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		else if(filename[i] >= 'A' && filename[i] <= 'Z')
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			base[bl++] = filename[i];
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		else if(filename[i] == '$' || filename[i] == '%' ||
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			filename[i] == '-' || filename[i] == '_' || filename[i] == '@' ||
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			filename[i] == '~' || filename[i] == '`' || filename[i] == '!' ||
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			filename[i] == '(' || filename[i] == ')' || filename[i] == '{' ||
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			filename[i] == '}' || filename[i] == '^' || filename[i] == '#' ||
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			filename[i] == '&' ||filename[i] == '\'')
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			base[bl++] = filename[i];
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		else if(filename[i] != ' ' && filename[i] != '.'){
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			base[bl++] = '_';
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			lossyConv = true ;
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		}
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		if(bl > 8){
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			bl -- ;
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			lossyConv = true ;
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			break ;
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		}		
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	}
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	if(lossyConv){
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		if(bl > 6) bl = 6 ;		
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		iShortName[bl] = '~';
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		iShortName[bl+1] = '1';		
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	}
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	memcpy(iShortName,base,bl);
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	//Copy the extension part.	
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	TUint ei = 8;
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	for(TUint e = 0; ei < 11 && ext[e] != 0 ; e++){
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		if(ext[e] >= 'a' && ext[e] <= 'z')
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			iShortName[ei++] = ext[e] + 'A' - 'a';
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		else if(ext[e] >= 'A' && ext[e] <= 'Z')
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			iShortName[ei++] = ext[e] ;
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		else if(ext[e] == '$' || ext[e] == '%' || ext[e] == '-' || ext[e] == '_' || 
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			ext[e] == '@' || ext[e] == '~' || ext[e] == '`' || ext[e] == '!' || 
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			ext[e] == '(' || ext[e] == ')' || ext[e] == '{' || ext[e] == '}' || 
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			ext[e] == '^' || ext[e] == '#' || ext[e] == '&' ||ext[e] == '\'')
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			iShortName[ei++] = ext[e] ;
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	}
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	if(iParent) 
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		iParent->MakeUniqueShortName(iShortName,bl); 
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}
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#ifdef _DEBUG
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void TFSNode::PrintTree(int nTab) {
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	for( int i = 0 ; i < nTab ; i++ )
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		cout << " " ;
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	cout << (iFileName ? iFileName : "") << " [" << hex << setw(2) << setfill('0') << (unsigned short)iAttrs << "] \n" ;
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	if(iFirstChild)
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		iFirstChild->PrintTree(nTab + 2);
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	if(iSibling)
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		iSibling->PrintTree(nTab);
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}
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#endif
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bool TFSNode::IsDirectory() const {
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	return (0 != (iAttrs & ATTR_DIRECTORY) || ATTR_VOLUME_ID == iAttrs) ;
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}
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int TFSNode::GetWideNameLength() const {
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	if(!iWideName)
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		return 0 ;
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	return iWideName->length() ;
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}
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TUint TFSNode::GetSize() const {
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	if( !IsDirectory())
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		return iFileSize ;
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	TUint retVal = sizeof(TShortDirEntry) ; // the tailed entry 
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	if(iParent)
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		retVal += sizeof(TShortDirEntry) * 2 ;
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	TFSNode* child = iFirstChild ;
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	while(child) {
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		TUint longNameEntries =  (child->GetWideNameLength() + KBytesPerEntry) / KBytesPerEntry  ;
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		retVal += longNameEntries * sizeof(TLongDirEntry) ;
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		retVal += sizeof(TShortDirEntry);
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		child = child->iSibling ;
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	}
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	return retVal ;
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}
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void TFSNode::Init(time_t aCreateTime, time_t aAccessTime, time_t aWriteTime, TUint aSize ) {
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	struct tm* temp = localtime(&aCreateTime);
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	iCrtDate.iCurrentDate.Day = temp->tm_mday;
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	iCrtDate.iCurrentDate.Month = temp->tm_mon+1; //As per FAT spec
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	iCrtDate.iCurrentDate.Year = temp->tm_year - 80;//As per FAT spec
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	iCrtTime.iCurrentTime.Hour = temp->tm_hour;
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	iCrtTime.iCurrentTime.Minute = temp->tm_min;
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	iCrtTime.iCurrentTime.Seconds = temp->tm_sec / 2;//As per FAT spec
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	iCrtTimeTenth = 0;
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	temp = localtime(&aAccessTime);	
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	iLstAccDate.iCurrentDate.Day = temp->tm_mday;
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	iLstAccDate.iCurrentDate.Month = temp->tm_mon+1; //As per FAT spec
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	iLstAccDate.iCurrentDate.Year = temp->tm_year - 80;//As per FAT spec
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	temp = localtime(&aWriteTime);
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	iWrtDate.iCurrentDate.Day = temp->tm_mday;
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	iWrtDate.iCurrentDate.Month = temp->tm_mon+1; //As per FAT spec
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	iWrtDate.iCurrentDate.Year = temp->tm_year - 80;//As per FAT spec
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	iWrtTime.iCurrentTime.Hour = temp->tm_hour;
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	iWrtTime.iCurrentTime.Minute = temp->tm_min;
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	iWrtTime.iCurrentTime.Seconds = temp->tm_sec / 2;//As per FAT spec 
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	iFileSize = aSize ; 
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}
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/** WriteDirEntries : Write FAT information for this node to a cluster buffer
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	* aStartIndex : [in],the beginning index of the outputed cluster  
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  * aClusterData : [in,out] the cluster buffer
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  * 
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  * notice, aClusterData is only required if node is a directory node.
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  * for a file node, no data will be written out.
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  * in this case, only corresponding cluster index information is updated.
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  */ 
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void TFSNode::WriteDirEntries(TUint aStartIndex,TUint8* aClusterData){
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	if(iFATEntry){
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		*((TUint16*)iFATEntry->DIR_FstClusHI) = (aStartIndex >> 16) ;
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		*((TUint16*)iFATEntry->DIR_FstClusLO) = (aStartIndex & 0xFFFF) ;
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	}
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	if(IsDirectory()) { // Directory , write dir entries ; 
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		TShortDirEntry* entry = reinterpret_cast<TShortDirEntry*>(aClusterData);
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		if(iParent != NULL) {
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			//Make 
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			GetShortEntry(entry); 
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			//TODO: Add comments to avoid mistaken deleting.			
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			memcpy(entry->DIR_Name,".            ",sizeof(entry->DIR_Name));
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			entry ++ ;
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			iParent->GetShortEntry(entry);
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			memcpy(entry->DIR_Name,"..           ",sizeof(entry->DIR_Name));
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			entry ++ ; 
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		}		 
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		TFSNode* child = iFirstChild ;
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		while(child){			
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			int items = child->GetLongEntries(reinterpret_cast<TLongDirEntry*>(entry));
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			entry += items ;
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			child->GetShortEntry(entry);
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			child->iFATEntry = entry ;
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			entry ++ ;
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			child = child->iSibling ; 
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   306
			
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		}
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	}
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}
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/** GetShortEntry : Make a short directory entry (FAT16/32 conception)
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  * aEntry : the entry buffer   
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  */ 
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void TFSNode::GetShortEntry(TShortDirEntry* aEntry) {
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  if(!aEntry) return ;
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	if(iFATEntry){
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		if(iFATEntry != aEntry)
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			memcpy(aEntry,iFATEntry,sizeof(TShortDirEntry));
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		return ;
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	}
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	memcpy(aEntry->DIR_Name,iShortName,sizeof(aEntry->DIR_Name)); 
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	aEntry->DIR_Attr = iAttrs;
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	aEntry->DIR_NTRes = 0 ;
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	aEntry->DIR_CrtTimeTenth = 0 ;        
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	memcpy(aEntry->DIR_CrtTime,&iCrtTime,sizeof(aEntry->DIR_CrtTime)); 
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	memcpy(aEntry->DIR_CrtDate,&iCrtDate,sizeof(aEntry->DIR_CrtDate));
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	memcpy(aEntry->DIR_LstAccDate,&iLstAccDate,sizeof(aEntry->DIR_LstAccDate));
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	memset(aEntry->DIR_FstClusHI,0,sizeof(aEntry->DIR_FstClusHI));
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	memcpy(aEntry->DIR_WrtTime,&iWrtTime,sizeof(aEntry->DIR_WrtTime)); 
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	memcpy(aEntry->DIR_WrtDate,&iWrtDate,sizeof(aEntry->DIR_WrtDate)); 
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	memset(aEntry->DIR_FstClusLO,0,sizeof(aEntry->DIR_FstClusLO)); 
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	memcpy(aEntry->DIR_FileSize,&iFileSize,sizeof(aEntry->DIR_FileSize));  
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   333
}
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TUint8 FATChkSum(const char* pFcbName) {
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    short fcbNameLen ;
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    TUint8 sum = 0 ;
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    for(fcbNameLen = 11 ; fcbNameLen != 0 ; fcbNameLen --) {
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        sum = ((sum & 1) ? 0x80 : 0 ) + (sum >> 1 ) + *pFcbName++ ; 
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    }
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    return sum ;        
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}
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/** GetLongEntries : Make a series of long directory entries (FAT16/32 conception)
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  * aEntries : the start addr of the long directory entries buffer
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  *
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  * return value : actual entris count.   
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  */ 
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int TFSNode::GetLongEntries(TLongDirEntry* aEntries) {
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  if(!aEntries) return 0;
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	int packs = (GetWideNameLength() + KBytesPerEntry) / KBytesPerEntry  ;
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	TUint buflen = packs * KBytesPerEntry;
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	TUint16* buffer = new(std::nothrow) TUint16[buflen];
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	if(!buffer)
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	return 0 ;
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	memset(buffer,0xff,(buflen << 1));    
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	if(iWideName) {
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	    memcpy(buffer,iWideName->c_str(),iWideName->bytes()); 
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	    buffer[iWideName->length()] = 0;
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	}
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	TUint8 chkSum = FATChkSum(iShortName);;
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   362
    
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	TUint16* ptr = buffer ;
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	TLongDirEntry* entry = aEntries +(packs - 1);
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  for(int i = 1 ; i <= packs ; i++, entry--) {		
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		entry->LDIR_Ord = i ;
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		entry->LDIR_Chksum = chkSum ;
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		entry->LDIR_Attr = (TUint8)ATTR_LONG_NAME;    
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		*((TUint16*)(entry->LDIR_FstClusLO)) = 0;
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		entry->LDIR_Type = 0;         
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		memcpy(entry->LDIR_Name1,ptr,10); 
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		memcpy(entry->LDIR_Name2,&ptr[5],12); 
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		memcpy(entry->LDIR_Name3,&ptr[11],4);
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		ptr += 13; 
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  }
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	aEntries->LDIR_Ord |= 0x40 ;
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   377
    
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	delete []buffer ;
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	return packs ; 
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   380
}
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   381
/** Make a unique name for a new child which has not been added.
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  * to avoid same short names under a directory
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   383
  * rShortName : [in,out] , The new short name to be checked and changed.
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  * baseNameLength: [in], the length of the base part of the short name 
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  * not including the "~n"
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  * for example, 
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  *  "ABC.LOG" => baseNameLength == 3 ("ABC")
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  *  "AB~1.TXT" => baseNameLength == 2 ("AB")
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   389
  *
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   390
  *
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   391
  *The Numeric-Tail Generation Algorithm
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   392
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   393
  * If (a "lossy conversion" was not flagged)
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   394
  * 		and	(the long name fits within the 8.3 naming conventions)
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   395
  * 		and	(the basis-name does not collide with any existing short name)
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   396
  * {
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   397
  * 	The short name is only the basis-name without the numeric tail.
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   398
  * }
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   399
  * else {
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   400
  * 	Insert a numeric-tail "~n" to the end of the primary name such that the value of 
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   401
  *		the "~n" is chosen so that the name thus formed does not collide with 
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   402
  *		any existing short name and that the primary name does not exceed eight
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   403
  *		characters in length.
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   404
  * }
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   405
  * The "~n" string can range from "~1" to "~999999". 
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   406
  *
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   407
  */
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   408
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   409
void TFSNode::MakeUniqueShortName(char rShortName[12],TUint baseNameLength) const { 
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   410
	bool dup ;
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   411
	char nstring[10];
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   412
	int n = 0 ;	
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   413
	do {
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   414
		TFSNode* child = iFirstChild ; 
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   415
		dup = false ;
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   416
		while(child){		 
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   417
			if(0 == memcmp(rShortName,child->iShortName,11)) {
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   418
				dup = true ;
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   419
				break ;
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   420
			}
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   421
			child = child->iSibling ;
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   422
		}
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   423
		if(dup){ //duplex , increase the index , make a new name 
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   424
			int nlen = sprintf(nstring,"~%u",++n);
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   425
			while((baseNameLength + nlen > 8) && baseNameLength > 1)
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   426
				baseNameLength -- ;
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   427
			memcpy(&rShortName[baseNameLength],nstring,nlen);
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   428
			
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   429
		}
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   430
	}while(dup) ;
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   431
		 
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   432
}
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   433