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7e95ff90c8
git-svn-id: http://encfs.googlecode.com/svn/trunk@95 db9cf616-1c43-0410-9cb8-a902689de0d6
144 lines
4.6 KiB
C++
144 lines
4.6 KiB
C++
/*****************************************************************************
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* Author: Valient Gough <vgough@pobox.com>
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*
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*****************************************************************************
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* Copyright (c) 2004, Valient Gough
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*
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* This program is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
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* for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _NameIO_incl_
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#define _NameIO_incl_
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#include <string>
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#include <list>
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#include <inttypes.h>
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#include "base/Interface.h"
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#include "base/shared_ptr.h"
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namespace encfs {
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class CipherV1;
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class NameIO
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{
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public:
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typedef shared_ptr<NameIO> (*Constructor)(const Interface &iface,
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const shared_ptr<CipherV1> &cipher);
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struct Algorithm
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{
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std::string name;
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std::string description;
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Interface iface;
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bool needsStreamMode;
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};
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typedef std::list<Algorithm> AlgorithmList;
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static AlgorithmList GetAlgorithmList( bool includeHidden = false );
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static shared_ptr<NameIO> New(const Interface &iface,
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const shared_ptr<CipherV1> &cipher);
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static shared_ptr<NameIO> New(const std::string &name,
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const shared_ptr<CipherV1> &cipher);
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static bool Register( const char *name, const char *description,
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const Interface &iface, Constructor constructor,
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bool needsStreamMode,
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bool hidden = false);
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NameIO();
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virtual ~NameIO();
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virtual Interface interface() const =0;
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void setChainedNameIV( bool enable );
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bool getChainedNameIV() const;
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void setReverseEncryption( bool enable );
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bool getReverseEncryption() const;
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std::string encodePath( const char *plaintextPath ) const;
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std::string decodePath( const char *encodedPath ) const;
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std::string encodePath( const char *plaintextPath, uint64_t *iv ) const;
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std::string decodePath( const char *encodedPath, uint64_t *iv ) const;
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virtual int maxEncodedNameLen( int plaintextNameLen ) const =0;
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virtual int maxDecodedNameLen( int encodedNameLen ) const =0;
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std::string encodeName( const char *plaintextName, int length ) const;
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std::string decodeName( const char *encodedName, int length ) const;
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protected:
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virtual int encodeName( const char *plaintextName, int length,
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char *encodedName ) const;
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virtual int decodeName( const char *encodedName, int length,
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char *plaintextName ) const;
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virtual int encodeName( const char *plaintextName, int length,
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uint64_t *iv, char *encodedName ) const =0;
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virtual int decodeName( const char *encodedName, int length,
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uint64_t *iv, char *plaintextName ) const =0;
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private:
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std::string recodePath( const char *path,
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int (NameIO::*codingLen)(int) const,
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int (NameIO::*codingFunc)(const char *, int,
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uint64_t *, char *) const,
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uint64_t *iv ) const;
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std::string _encodePath( const char *plaintextPath, uint64_t *iv ) const;
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std::string _decodePath( const char *encodedPath, uint64_t *iv ) const;
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std::string _encodeName( const char *plaintextName, int length ) const;
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std::string _decodeName( const char *encodedName, int length ) const;
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bool chainedNameIV;
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bool reverseEncryption;
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};
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/*
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Helper macros for creating temporary buffers with an optimization that
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below a given size (OptimizedSize) is allocated on the stack, and when a
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larger size is requested it is allocated on the heap.
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BUFFER_RESET should be called for the same name as BUFFER_INIT
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*/
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#define BUFFER_INIT( Name, OptimizedSize, Size ) \
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char Name ## _Raw [ OptimizedSize ]; \
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char *Name = Name ## _Raw; \
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if( sizeof(Name ## _Raw) < Size ) { \
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Name = new char[ Size ];\
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} \
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memset( Name, 0, Size )
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#define BUFFER_RESET( Name ) \
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do { \
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if( Name != Name ## _Raw ) { \
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delete[] Name; \
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Name = Name ## _Raw; \
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} \
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} while(0)
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} // namespace encfs
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#endif
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