/*
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* Copyright (c) 2016-2020 Belledonne Communications SARL.
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*
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* This file is part of bctoolbox.
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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 BCTBX_VFS_H
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#define BCTBX_VFS_H
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#include <fcntl.h>
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#include <bctoolbox/port.h>
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#if !defined(_WIN32_WCE)
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#include <sys/types.h>
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#include <sys/stat.h>
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#if _MSC_VER
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#include <io.h>
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#endif
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#endif /*_WIN32_WCE*/
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#ifndef _WIN32
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#include <unistd.h>
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#endif
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#ifdef _WIN32
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#ifndef S_IRUSR
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#define S_IRUSR S_IREAD
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#endif
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#ifndef S_IWUSR
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#define S_IWUSR S_IWRITE
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#endif
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#endif /*!_WIN32*/
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#define BCTBX_VFS_OK 0 /* Successful result */
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#define BCTBX_VFS_ERROR -255 /* Some kind of disk I/O error occurred */
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#ifdef __cplusplus
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extern "C"{
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#endif
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/**
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* Methods associated with the bctbx_vfs_t.
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*/
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typedef struct bctbx_io_methods_t bctbx_io_methods_t;
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/**
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* VFS file handle.
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*/
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typedef struct bctbx_vfs_file_t bctbx_vfs_file_t;
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struct bctbx_vfs_file_t {
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const struct bctbx_io_methods_t *pMethods; /* Methods for an open file: all Developpers must supply this field at open step*/
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/*the fields below are used by the default implementation. Developpers are not required to supply them, but may use them if they find
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* them useful*/
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void* pUserData; /*Developpers can store private data under this pointer */
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int fd; /* File descriptor */
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off_t offset; /*File offset used by lseek*/
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};
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/**
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*/
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struct bctbx_io_methods_t {
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int (*pFuncClose)(bctbx_vfs_file_t *pFile);
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ssize_t (*pFuncRead)(bctbx_vfs_file_t *pFile, void* buf, size_t count, off_t offset);
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ssize_t (*pFuncWrite)(bctbx_vfs_file_t *pFile, const void* buf, size_t count, off_t offset);
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int (*pFuncTruncate)(bctbx_vfs_file_t *pFile, int64_t size);
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int64_t (*pFuncFileSize)(bctbx_vfs_file_t *pFile);
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int (*pFuncGetLineFromFd)(bctbx_vfs_file_t *pFile, char* s, int count);
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off_t (*pFuncSeek)(bctbx_vfs_file_t *pFile, off_t offset, int whence);
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};
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/**
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* VFS definition
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*/
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typedef struct bctbx_vfs_t bctbx_vfs_t;
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struct bctbx_vfs_t {
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const char *vfsName; /* Virtual file system name */
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int (*pFuncOpen)(bctbx_vfs_t *pVfs, bctbx_vfs_file_t *pFile, const char *fName, int openFlags);
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};
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/* API to use the VFS */
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/*
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* This function returns a pointer to the VFS implemented in this file.
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*/
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BCTBX_PUBLIC bctbx_vfs_t *bc_create_vfs(void);
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/**
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* Attempts to read count bytes from the open file given by pFile, at the position starting at offset
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* in the file and and puts them in the buffer pointed by buf.
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* @param pFile bctbx_vfs_file_t File handle pointer.
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* @param buf Buffer holding the read bytes.
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* @param count Number of bytes to read.
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* @param offset Where to start reading in the file (in bytes).
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* @return Number of bytes read on success, BCTBX_VFS_ERROR otherwise.
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*/
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BCTBX_PUBLIC ssize_t bctbx_file_read(bctbx_vfs_file_t *pFile, void *buf, size_t count, off_t offset);
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/**
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* Close the file from its descriptor pointed by thw bctbx_vfs_file_t handle.
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* @param pFile File handle pointer.
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* @return return value from the pFuncClose VFS Close function on success,
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* BCTBX_VFS_ERROR otherwise.
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*/
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BCTBX_PUBLIC int bctbx_file_close(bctbx_vfs_file_t *pFile);
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/**
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* Allocates a bctbx_vfs_file_t file handle pointer. Opens the file fName
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* with the mode specified by the mode argument. Calls bctbx_file_open.
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* @param pVfs Pointer to the vfs instance in use.
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* @param fName Absolute file path.
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* @param mode File access mode (char*).
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* @return pointer to bctbx_vfs_file_t on success, NULL otherwise.
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*/
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BCTBX_PUBLIC bctbx_vfs_file_t* bctbx_file_open(bctbx_vfs_t *pVfs, const char *fName, const char *mode);
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/**
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* Allocates a bctbx_vfs_file_t file handle pointer. Opens the file fName
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* with the mode specified by the mode argument. Calls bctbx_file_open.
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* @param pVfs Pointer to the vfs instance in use.
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* @param fName Absolute file path.
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* @param openFlags File access flags(integer).
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* @return pointer to bctbx_vfs_file_t on success, NULL otherwise.
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*/
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BCTBX_PUBLIC bctbx_vfs_file_t* bctbx_file_open2(bctbx_vfs_t *pVfs, const char *fName, const int openFlags);
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/**
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* Returns the file size.
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* @param pFile bctbx_vfs_file_t File handle pointer.
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* @return BCTBX_VFS_ERROR if an error occured, file size otherwise.
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*/
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BCTBX_PUBLIC int64_t bctbx_file_size(bctbx_vfs_file_t *pFile);
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/**
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* Truncates/ Extends a file.
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* @param pFile bctbx_vfs_file_t File handle pointer.
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* @param size New size of the file.
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* @return BCTBX_VFS_ERROR if an error occured, 0 otherwise.
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*/
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BCTBX_PUBLIC int bctbx_file_truncate(bctbx_vfs_file_t *pFile, int64_t size);
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/**
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* Write count bytes contained in buf to a file associated with pFile at the position
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* offset. Calls pFuncWrite (set to bc_Write by default).
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* @param pFile File handle pointer.
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* @param buf Buffer hodling the values to write.
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* @param count Number of bytes to write to the file.
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* @param offset Position in the file where to start writing.
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* @return Number of bytes written on success, BCTBX_VFS_ERROR if an error occurred.
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*/
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BCTBX_PUBLIC ssize_t bctbx_file_write(bctbx_vfs_file_t *pFile, const void *buf, size_t count, off_t offset);
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/**
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* Writes to file.
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* @param pFile File handle pointer.
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* @param offset where to write in the file
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* @param fmt format argument, similar to that of printf
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* @return Number of bytes written if success, BCTBX_VFS_ERROR otherwise.
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*/
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BCTBX_PUBLIC ssize_t bctbx_file_fprintf(bctbx_vfs_file_t *pFile, off_t offset, const char *fmt, ...);
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/**
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* Wrapper to pFuncGetNxtLine. Returns a line with at most maxlen characters
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* from the file associated to pFile and writes it into s.
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* @param pFile File handle pointer.
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* @param s Buffer where to store the read line.
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* @param maxlen Number of characters to read to find a line in the file.
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* @return BCTBX_VFS_ERROR if an error occurred, size of line read otherwise.
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*/
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BCTBX_PUBLIC int bctbx_file_get_nxtline(bctbx_vfs_file_t *pFile, char *s, int maxlen);
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/**
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* Wrapper to pFuncSeek VFS method call. Set the position to offset in the file.
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* @param pFile File handle pointer.
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* @param offset File offset where to set the position to.
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* @param whence Either SEEK_SET, SEEK_CUR,SEEK_END
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* @return BCTBX_VFS_ERROR on error, offset otherwise.
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*/
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BCTBX_PUBLIC off_t bctbx_file_seek(bctbx_vfs_file_t *pFile, off_t offset, int whence);
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/**
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* Set default VFS pointer pDefault to my_vfs.
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* By default, the global pointer is set to use VFS implemnted in vfs.c
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* @param my_vfs Pointer to a bctbx_vfs_t structure.
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*/
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BCTBX_PUBLIC void bctbx_vfs_set_default(bctbx_vfs_t *my_vfs);
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/**
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* Returns the value of the global variable pDefault,
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* pointing to the default vfs used.
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* @return Pointer to bctbx_vfs_t set to operate as default VFS.
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*/
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BCTBX_PUBLIC bctbx_vfs_t* bctbx_vfs_get_default(void);
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/**
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* Return pointer to standard VFS impletentation.
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* @return pointer to bcVfs
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*/
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BCTBX_PUBLIC bctbx_vfs_t* bctbx_vfs_get_standard(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* BCTBX_VFS_H */
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