kopia lustrzana https://github.com/OpenRTX/OpenRTX
128 wiersze
3.7 KiB
C
128 wiersze
3.7 KiB
C
/***************************************************************************
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* Copyright (C) 2023 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN *
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* Frederik Saraci IU2NRO *
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* Silvano Seva IU2KWO *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU 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 <interfaces/nvmem.h>
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#include <limits.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <errno.h>
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#include <fcntl.h>
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#include "posix_file.h"
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static const struct nvmParams posix_file_params =
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{
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.write_size = 1,
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.erase_size = 1,
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.erase_cycles = INT_MAX,
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.type = NVM_FILE
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};
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int posixFile_init(const struct nvmDevice *dev, const char *fileName)
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{
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const struct posixFileCfg *cfg = (const struct posixFileCfg *)(dev->config);
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const char *name = cfg->fileName;
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// Override filename from config, if a new one is provided.
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if(fileName != NULL)
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name = fileName;
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// Test if file exists, if it doesn't create it.
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int flags = O_RDWR;
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int ret = access(name, F_OK);
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if(ret != 0)
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flags |= O_CREAT | O_EXCL;
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// Open file
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int fd = open(name, flags, S_IRUSR | S_IWUSR);
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if(fd < 0)
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return fd;
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// Truncate to size, pad with zeroes if extending.
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ftruncate(fd, cfg->fileSize);
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*(int *)(dev->priv) = fd;
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return 0;
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}
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int posixFile_terminate(const struct nvmDevice *dev)
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{
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int fd = *(int *)(dev->priv);
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if(fd < 0)
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return -EBADF;
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fsync(fd);
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close(fd);
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*(int *)(dev->priv) = -1;
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return 0;
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}
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static int nvm_api_read(const struct nvmDevice *dev, uint32_t offset,
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void *data, size_t len)
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{
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const struct posixFileCfg *cfg = (const struct posixFileCfg *)(dev->config);
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const int fd = *(int *)(dev->priv);
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if(fd < 0)
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return -EBADF;
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if((offset + len) >= cfg->fileSize)
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return -EINVAL;
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lseek(fd, offset, SEEK_SET);
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return read(fd, data, len);
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}
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static int nvm_api_write(const struct nvmDevice *dev, uint32_t offset,
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const void *data, size_t len)
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{
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const struct posixFileCfg *cfg = (const struct posixFileCfg *)(dev->config);
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const int fd = *(int *)(dev->priv);
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if(fd < 0)
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return -EBADF;
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if((offset + len) >= cfg->fileSize)
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return -EINVAL;
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lseek(fd, offset, SEEK_SET);
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return write(fd, data, len);
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}
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static const struct nvmParams *nvm_api_params(const struct nvmDevice *dev)
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{
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(void) dev;
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return &posix_file_params;
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}
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const struct nvmApi posix_file_api =
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{
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.read = nvm_api_read,
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.write = nvm_api_write,
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.erase = NULL,
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.sync = NULL,
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.params = nvm_api_params
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};
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