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7799c88df6
git-svn-id: http://encfs.googlecode.com/svn/trunk@93 db9cf616-1c43-0410-9cb8-a902689de0d6
110 lines
2.5 KiB
C++
110 lines
2.5 KiB
C++
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/*****************************************************************************
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* Author: Valient Gough <vgough@pobox.com>
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*
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*****************************************************************************
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* Copyright (c) 2012 Valient Gough
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*
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* This program is free software: you can redistribute it and/or modify it under
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* the terms of the GNU Lesser General Public License as published by the Free
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* Software Foundation, either version 3 of the License, or (at your option) any
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* 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 FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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* 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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#include "fs/MemFileIO.h"
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#include "base/Error.h"
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#include <glog/logging.h>
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namespace encfs {
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static Interface MemFileIO_iface = makeInterface("FileIO/Mem", 1, 0, 0);
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MemFileIO* NewMemFileIO(const Interface& iface) {
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(void)iface;
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return new MemFileIO(0);
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}
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MemFileIO::MemFileIO(int size)
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: writable(false) {
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buf.resize(size);
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}
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MemFileIO::~MemFileIO() {
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}
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Interface MemFileIO::interface() const {
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return MemFileIO_iface;
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}
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void MemFileIO::setFileName(const char *name) {
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this->name = name;
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}
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const char *MemFileIO::getFileName() const {
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return name.c_str();
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}
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int MemFileIO::open(int flags) {
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bool requestWrite = ((flags & O_RDWR) || (flags & O_WRONLY));
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writable = writable || requestWrite;
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LOG(ERROR) << "returning fake file descriptor";
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return 0;
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}
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int MemFileIO::getAttr(struct stat* stbuf) const {
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stbuf->st_size = buf.size();
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return 0;
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}
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off_t MemFileIO::getSize() const {
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return buf.size();
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}
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ssize_t MemFileIO::read(const IORequest& req) const {
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rAssert(req.offset >= 0);
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int len = req.dataLen;
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if (req.offset + req.dataLen > getSize()) {
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len = getSize() - req.offset;
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}
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if (len < 0) {
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len = 0;
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}
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memcpy(req.data, &buf[req.offset], len);
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return len;
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}
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bool MemFileIO::write(const IORequest& req) {
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rAssert(req.offset >= 0);
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if (req.offset + req.dataLen > getSize()) {
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truncate(req.offset + req.dataLen);
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}
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rAssert(req.offset + req.dataLen <= getSize());
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memcpy(&buf[req.offset], req.data, req.dataLen);
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return true;
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}
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int MemFileIO::truncate(off_t size) {
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buf.resize(size);
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return 0;
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}
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bool MemFileIO::isWritable() const {
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return writable;
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}
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} // namespace encfs
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