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86 lines
2.4 KiB
C++
86 lines
2.4 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 _FileIO_incl_
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#define _FileIO_incl_
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#include <inttypes.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include "Interface.h"
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#include "encfs.h"
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namespace encfs {
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struct IORequest {
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off_t offset;
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// amount of bytes to read/write.
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size_t dataLen;
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unsigned char *data;
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IORequest();
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};
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inline IORequest::IORequest() : offset(0), dataLen(0), data(0) {}
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class FileIO {
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public:
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FileIO();
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virtual ~FileIO();
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virtual Interface interface() const = 0;
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// default implementation returns 1, meaning this is not block oriented.
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virtual unsigned int blockSize() const;
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virtual void setFileName(const char *fileName) = 0;
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virtual const char *getFileName() const = 0;
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// Not sure about this -- it is specific to CipherFileIO, but the
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// alternative methods of exposing this interface aren't much nicer..
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virtual bool setIV(uint64_t iv);
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// open file for specified mode. There is no corresponding close, so a
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// file is open until the FileIO interface is destroyed.
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virtual int open(int flags) = 0;
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// get filesystem attributes for a file
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virtual int getAttr(struct stat *stbuf) const = 0;
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virtual off_t getSize() const = 0;
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virtual ssize_t read(const IORequest &req) const = 0;
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virtual ssize_t write(const IORequest &req) = 0;
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virtual int truncate(off_t size) = 0;
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virtual bool isWritable() const = 0;
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private:
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// not implemented..
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FileIO(const FileIO &);
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FileIO &operator=(const FileIO &);
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};
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} // namespace encfs
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#endif
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