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lv_fs_pc.c
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lv_fs_pc.c
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/**
* @file lv_fs_pc.c
*
*/
/*********************
* INCLUDES
*********************/
#include "lv_fs_if.h"
#if LV_USE_FS_IF
#if LV_FS_IF_PC != '\0'
#include <stdio.h>
#include <errno.h>
#include <dirent.h>
#include <unistd.h>
#ifdef WIN32
#include <windows.h>
#endif
/*********************
* DEFINES
*********************/
#ifndef LV_FS_PC_PATH
# ifndef WIN32
# define LV_FS_PC_PATH "./" /*Projet root*/
# else
# define LV_FS_PC_PATH ".\\" /*Projet root*/
# endif
#endif /*LV_FS_PATH*/
/**********************
* TYPEDEFS
**********************/
/**********************
* STATIC PROTOTYPES
**********************/
static void * fs_open (lv_fs_drv_t * drv, const char * path, lv_fs_mode_t mode);
static lv_fs_res_t fs_close (lv_fs_drv_t * drv, void * file_p);
static lv_fs_res_t fs_read (lv_fs_drv_t * drv, void * file_p, void * buf, uint32_t btr, uint32_t * br);
static lv_fs_res_t fs_write(lv_fs_drv_t * drv, void * file_p, const void * buf, uint32_t btw, uint32_t * bw);
static lv_fs_res_t fs_seek (lv_fs_drv_t * drv, void * file_p, uint32_t pos, lv_fs_whence_t whence);
static lv_fs_res_t fs_tell (lv_fs_drv_t * drv, void * file_p, uint32_t * pos_p);
static void * fs_dir_open (lv_fs_drv_t * drv, const char *path);
static lv_fs_res_t fs_dir_read (lv_fs_drv_t * drv, void * dir_p, char *fn);
static lv_fs_res_t fs_dir_close (lv_fs_drv_t * drv, void * dir_p);
/**********************
* STATIC VARIABLES
**********************/
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
/**
* Register a driver for the File system interface
*/
void lv_fs_if_pc_init(void)
{
/*---------------------------------------------------
* Register the file system interface in LittlevGL
*--------------------------------------------------*/
/* Add a simple drive to open images */
static lv_fs_drv_t fs_drv; /*A driver descriptor*/
lv_fs_drv_init(&fs_drv);
/*Set up fields...*/
fs_drv.letter = LV_FS_IF_PC;
fs_drv.open_cb = fs_open;
fs_drv.close_cb = fs_close;
fs_drv.read_cb = fs_read;
fs_drv.write_cb = fs_write;
fs_drv.seek_cb = fs_seek;
fs_drv.tell_cb = fs_tell;
fs_drv.dir_close_cb = fs_dir_close;
fs_drv.dir_open_cb = fs_dir_open;
fs_drv.dir_read_cb = fs_dir_read;
lv_fs_drv_register(&fs_drv);
char cur_path[512];
getcwd(cur_path, sizeof(cur_path));
LV_LOG_USER("LV_FS_PC is initialized with.");
LV_LOG_USER("The following path is considered as root directory:\n%s", cur_path);
}
/**********************
* STATIC FUNCTIONS
**********************/
/**
* Open a file
* @param drv pointer to a driver where this function belongs
* @param file_p pointer to a file_t variable
* @param path path to the file beginning with the driver letter (e.g. S:/folder/file.txt)
* @param mode read: FS_MODE_RD, write: FS_MODE_WR, both: FS_MODE_RD | FS_MODE_WR
* @return LV_FS_RES_OK or any error from lv_fs_res_t enum
*/
static void * fs_open (lv_fs_drv_t * drv, const char * path, lv_fs_mode_t mode)
{
(void) drv; /*Unused*/
errno = 0;
const char * flags = "";
if(mode == LV_FS_MODE_WR) flags = "wb";
else if(mode == LV_FS_MODE_RD) flags = "rb";
else if(mode == (LV_FS_MODE_WR | LV_FS_MODE_RD)) flags = "rb+";
/*Make the path relative to the current directory (the projects root folder)*/
#ifndef WIN32
char buf[256];
sprintf(buf, LV_FS_PC_PATH "%s", path);
#else
char buf[256];
sprintf(buf, LV_FS_PC_PATH "%s", path);
#endif
FILE * f = fopen(buf, flags);
if(f == NULL) return NULL;
/*Be sure we are the beginning of the file*/
fseek(f, 0, SEEK_SET);
return f;
}
/**
* Close an opened file
* @param drv pointer to a driver where this function belongs
* @param file_p pointer to a file_t variable. (opened with lv_ufs_open)
* @return LV_FS_RES_OK: no error, the file is read
* any error from lv_fs_res_t enum
*/
static lv_fs_res_t fs_close (lv_fs_drv_t * drv, void * file_p)
{
(void) drv; /*Unused*/
fclose(file_p);
return LV_FS_RES_OK;
}
/**
* Read data from an opened file
* @param drv pointer to a driver where this function belongs
* @param file_p pointer to a file_t variable.
* @param buf pointer to a memory block where to store the read data
* @param btr number of Bytes To Read
* @param br the real number of read bytes (Byte Read)
* @return LV_FS_RES_OK: no error, the file is read
* any error from lv_fs_res_t enum
*/
static lv_fs_res_t fs_read (lv_fs_drv_t * drv, void * file_p, void * buf, uint32_t btr, uint32_t * br)
{
(void) drv; /*Unused*/
*br = fread(buf, 1, btr, file_p);
return LV_FS_RES_OK;
}
/**
* Write into a file
* @param drv pointer to a driver where this function belongs
* @param file_p pointer to a file_t variable
* @param buf pointer to a buffer with the bytes to write
* @param btr Bytes To Write
* @param br the number of real written bytes (Bytes Written). NULL if unused.
* @return LV_FS_RES_OK or any error from lv_fs_res_t enum
*/
static lv_fs_res_t fs_write(lv_fs_drv_t * drv, void * file_p, const void * buf, uint32_t btw, uint32_t * bw)
{
(void) drv; /*Unused*/
*bw = fwrite(buf, 1, btw, file_p);
return LV_FS_RES_OK;
}
/**
* Set the read write pointer. Also expand the file size if necessary.
* @param drv pointer to a driver where this function belongs
* @param file_p pointer to a file_t variable. (opened with lv_ufs_open )
* @param pos the new position of read write pointer
* @return LV_FS_RES_OK: no error, the file is read
* any error from lv_fs_res_t enum
*/
static lv_fs_res_t fs_seek (lv_fs_drv_t * drv, void * file_p, uint32_t pos, lv_fs_whence_t whence)
{
(void) drv; /*Unused*/
fseek(file_p, pos, whence);
return LV_FS_RES_OK;
}
/**
* Give the position of the read write pointer
* @param drv pointer to a driver where this function belongs
* @param file_p pointer to a file_t variable.
* @param pos_p pointer to to store the result
* @return LV_FS_RES_OK: no error, the file is read
* any error from lv_fs_res_t enum
*/
static lv_fs_res_t fs_tell (lv_fs_drv_t * drv, void * file_p, uint32_t * pos_p)
{
(void) drv; /*Unused*/
*pos_p = ftell(file_p);
return LV_FS_RES_OK;
}
#ifdef WIN32
static char next_fn[256];
#endif
/**
* Initialize a 'fs_read_dir_t' variable for directory reading
* @param drv pointer to a driver where this function belongs
* @param dir_p pointer to a 'fs_read_dir_t' variable
* @param path path to a directory
* @return LV_FS_RES_OK or any error from lv_fs_res_t enum
*/
static void * fs_dir_open (lv_fs_drv_t * drv, const char *path)
{
(void) drv; /*Unused*/
#ifndef WIN32
/*Make the path relative to the current directory (the projects root folder)*/
char buf[256];
sprintf(buf, LV_FS_PC_PATH "/%s", path);
return opendir(buf);
#else
HANDLE d = INVALID_HANDLE_VALUE;
WIN32_FIND_DATA fdata;
/*Make the path relative to the current directory (the projects root folder)*/
char buf[256];
sprintf(buf, LV_FS_PC_PATH "\\%s\\*", path);
strcpy(next_fn, "");
d = FindFirstFile(buf, &fdata);
do {
if (strcmp(fdata.cFileName, ".") == 0 || strcmp(fdata.cFileName, "..") == 0) {
continue;
} else {
if (fdata.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
{
sprintf(next_fn, "/%s", fdata.cFileName);
} else {
sprintf(next_fn, "%s", fdata.cFileName);
}
break;
}
} while(FindNextFileA(d, &fdata));
return d;
#endif
}
/**
* Read the next filename form a directory.
* The name of the directories will begin with '/'
* @param drv pointer to a driver where this function belongs
* @param dir_p pointer to an initialized 'fs_read_dir_t' variable
* @param fn pointer to a buffer to store the filename
* @return LV_FS_RES_OK or any error from lv_fs_res_t enum
*/
static lv_fs_res_t fs_dir_read (lv_fs_drv_t * drv, void * dir_p, char *fn)
{
(void) drv; /*Unused*/
#ifndef WIN32
struct dirent *entry;
do {
entry = readdir(dir_p);
if(entry) {
if(entry->d_type == DT_DIR) sprintf(fn, "/%s", entry->d_name);
else strcpy(fn, entry->d_name);
} else {
strcpy(fn, "");
}
} while(strcmp(fn, "/.") == 0 || strcmp(fn, "/..") == 0);
#else
strcpy(fn, next_fn);
strcpy(next_fn, "");
WIN32_FIND_DATA fdata;
if(FindNextFile(dir_p, &fdata) == false) return LV_FS_RES_OK;
do {
if (strcmp(fdata.cFileName, ".") == 0 || strcmp(fdata.cFileName, "..") == 0) {
continue;
} else {
if (fdata.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
{
sprintf(next_fn, "/%s", fdata.cFileName);
} else {
sprintf(next_fn, "%s", fdata.cFileName);
}
break;
}
} while(FindNextFile(dir_p, &fdata));
#endif
return LV_FS_RES_OK;
}
/**
* Close the directory reading
* @param drv pointer to a driver where this function belongs
* @param dir_p pointer to an initialized 'fs_read_dir_t' variable
* @return LV_FS_RES_OK or any error from lv_fs_res_t enum
*/
static lv_fs_res_t fs_dir_close (lv_fs_drv_t * drv, void * dir_p)
{
(void) drv; /*Unused*/
#ifndef WIN32
closedir(dir_p);
#else
FindClose(dir_p);
#endif
return LV_FS_RES_OK;
}
#endif /*LV_USE_FS_IF*/
#endif /*LV_FS_IF_FATFS*/