mirror of
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76 lines
2.5 KiB
C
76 lines
2.5 KiB
C
/*
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* Copyright (C) 2011 Andrea Mazzoleni
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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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#ifndef __HANDLE_H
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#define __HANDLE_H
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/****************************************************************************/
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/* handle */
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struct snapraid_handle {
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char path[PATH_MAX]; /**< Path of the file. */
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struct snapraid_disk* disk; /**< Disk of the file. */
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struct snapraid_file* file; /**< File opened. */
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int f; /**< Handle of the file. */
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struct stat st; /**< Stat info of the opened file. */
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};
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/**
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* Creates all the required directories if missing.
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*/
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int handle_ancestor(const char* file);
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/**
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* Closes a file, if it's different from the specified one.
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*/
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int handle_close_if_different(struct snapraid_handle* handle, struct snapraid_file* file);
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/**
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* Creates a file.
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* The file is created if missing, and opened with write access.
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* If the file has a different size than expected, it's enlarged or truncated to the correct size.
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* If the file is truncated 1 is returned.
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* The initial size of the file is stored in the file->st struct.
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* If the file cannot be opened for write access, it's opened with read-only access.
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* The read-only access works only if the file has already the correct size and doesn't need to be modified.
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*/
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int handle_create(struct snapraid_handle* handle, struct snapraid_file* file);
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/**
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* Opens a file.
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* The file is opened for reading.
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*/
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int handle_open(struct snapraid_handle* handle, struct snapraid_file* file);
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/**
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* Closes a file.
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*/
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int handle_close(struct snapraid_handle* handle);
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/**
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* Read a block from a file.
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* If the read block is shorter, it's padded with 0.
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*/
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int handle_read(struct snapraid_handle* handle, struct snapraid_block* block, unsigned char* block_buffer, unsigned block_size);
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/**
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* Writes a block to a file.
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*/
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int handle_write(struct snapraid_handle* handle, struct snapraid_block* block, unsigned char* block_buffer, unsigned block_size);
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#endif
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