313 lines
8.9 KiB
C
313 lines
8.9 KiB
C
/**
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* @file lv_fs_stdio.c
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*
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*/
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/*********************
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* INCLUDES
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*********************/
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#include "../../../../lvgl/lvgl.h"
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#if LV_USE_FS_STDIO != '\0'
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#include <stdio.h>
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#ifndef WIN32
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#include <dirent.h>
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#include <unistd.h>
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#else
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#include <windows.h>
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#endif
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/*********************
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* DEFINES
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*********************/
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/**********************
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* TYPEDEFS
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**********************/
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/**********************
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* STATIC PROTOTYPES
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**********************/
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static void * fs_open(lv_fs_drv_t * drv, const char * path, lv_fs_mode_t mode);
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static lv_fs_res_t fs_close(lv_fs_drv_t * drv, void * file_p);
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static lv_fs_res_t fs_read(lv_fs_drv_t * drv, void * file_p, void * buf, uint32_t btr, uint32_t * br);
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static lv_fs_res_t fs_write(lv_fs_drv_t * drv, void * file_p, const void * buf, uint32_t btw, uint32_t * bw);
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static lv_fs_res_t fs_seek(lv_fs_drv_t * drv, void * file_p, uint32_t pos, lv_fs_whence_t whence);
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static lv_fs_res_t fs_tell(lv_fs_drv_t * drv, void * file_p, uint32_t * pos_p);
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static void * fs_dir_open(lv_fs_drv_t * drv, const char * path);
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static lv_fs_res_t fs_dir_read(lv_fs_drv_t * drv, void * dir_p, char * fn);
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static lv_fs_res_t fs_dir_close(lv_fs_drv_t * drv, void * dir_p);
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/**********************
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* STATIC VARIABLES
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**********************/
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/**********************
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* MACROS
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**********************/
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/**********************
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* GLOBAL FUNCTIONS
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**********************/
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/**
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* Register a driver for the File system interface
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*/
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void lv_fs_stdio_init(void)
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{
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/*---------------------------------------------------
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* Register the file system interface in LVGL
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*--------------------------------------------------*/
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/*Add a simple drive to open images*/
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static lv_fs_drv_t fs_drv; /*A driver descriptor*/
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lv_fs_drv_init(&fs_drv);
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/*Set up fields...*/
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fs_drv.letter = LV_FS_STDIO_LETTER;
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fs_drv.cache_size = LV_FS_STDIO_CACHE_SIZE;
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fs_drv.open_cb = fs_open;
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fs_drv.close_cb = fs_close;
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fs_drv.read_cb = fs_read;
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fs_drv.write_cb = fs_write;
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fs_drv.seek_cb = fs_seek;
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fs_drv.tell_cb = fs_tell;
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fs_drv.dir_close_cb = fs_dir_close;
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fs_drv.dir_open_cb = fs_dir_open;
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fs_drv.dir_read_cb = fs_dir_read;
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lv_fs_drv_register(&fs_drv);
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}
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/**********************
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* STATIC FUNCTIONS
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**********************/
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/**
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* Open a file
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* @param drv pointer to a driver where this function belongs
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* @param path path to the file beginning with the driver letter (e.g. S:/folder/file.txt)
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* @param mode read: FS_MODE_RD, write: FS_MODE_WR, both: FS_MODE_RD | FS_MODE_WR
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* @return pointer to FIL struct or NULL in case of fail
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*/
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static void * fs_open(lv_fs_drv_t * drv, const char * path, lv_fs_mode_t mode)
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{
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LV_UNUSED(drv);
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const char * flags = "";
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if(mode == LV_FS_MODE_WR) flags = "wb";
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else if(mode == LV_FS_MODE_RD) flags = "rb";
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else if(mode == (LV_FS_MODE_WR | LV_FS_MODE_RD)) flags = "rb+";
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/*Make the path relative to the current directory (the projects root folder)*/
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char buf[256];
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lv_snprintf(buf, sizeof(buf), LV_FS_STDIO_PATH "%s", path);
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return fopen(buf, flags);
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}
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/**
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* Close an opened file
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* @param drv pointer to a driver where this function belongs
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* @param file_p pointer to a FILE variable. (opened with fs_open)
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* @return LV_FS_RES_OK: no error, the file is read
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* any error from lv_fs_res_t enum
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*/
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static lv_fs_res_t fs_close(lv_fs_drv_t * drv, void * file_p)
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{
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LV_UNUSED(drv);
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fclose(file_p);
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return LV_FS_RES_OK;
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}
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/**
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* Read data from an opened file
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* @param drv pointer to a driver where this function belongs
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* @param file_p pointer to a FILE variable.
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* @param buf pointer to a memory block where to store the read data
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* @param btr number of Bytes To Read
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* @param br the real number of read bytes (Byte Read)
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* @return LV_FS_RES_OK: no error, the file is read
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* any error from lv_fs_res_t enum
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*/
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static lv_fs_res_t fs_read(lv_fs_drv_t * drv, void * file_p, void * buf, uint32_t btr, uint32_t * br)
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{
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LV_UNUSED(drv);
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*br = fread(buf, 1, btr, file_p);
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return (int32_t)(*br) < 0 ? LV_FS_RES_UNKNOWN : LV_FS_RES_OK;
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}
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/**
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* Write into a file
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* @param drv pointer to a driver where this function belongs
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* @param file_p pointer to a FILE variable
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* @param buf pointer to a buffer with the bytes to write
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* @param btw Bytes To Write
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* @param bw the number of real written bytes (Bytes Written). NULL if unused.
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* @return LV_FS_RES_OK or any error from lv_fs_res_t enum
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*/
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static lv_fs_res_t fs_write(lv_fs_drv_t * drv, void * file_p, const void * buf, uint32_t btw, uint32_t * bw)
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{
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LV_UNUSED(drv);
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*bw = fwrite(buf, 1, btw, file_p);
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return (int32_t)(*bw) < 0 ? LV_FS_RES_UNKNOWN : LV_FS_RES_OK;
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}
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/**
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* Set the read write pointer. Also expand the file size if necessary.
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* @param drv pointer to a driver where this function belongs
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* @param file_p pointer to a FILE variable. (opened with fs_open )
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* @param pos the new position of read write pointer
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* @return LV_FS_RES_OK: no error, the file is read
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* any error from lv_fs_res_t enum
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*/
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static lv_fs_res_t fs_seek(lv_fs_drv_t * drv, void * file_p, uint32_t pos, lv_fs_whence_t whence)
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{
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LV_UNUSED(drv);
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fseek(file_p, pos, whence);
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return LV_FS_RES_OK;
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}
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/**
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* Give the position of the read write pointer
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* @param drv pointer to a driver where this function belongs
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* @param file_p pointer to a FILE variable.
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* @param pos_p pointer to to store the result
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* @return LV_FS_RES_OK: no error, the file is read
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* any error from lv_fs_res_t enum
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*/
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static lv_fs_res_t fs_tell(lv_fs_drv_t * drv, void * file_p, uint32_t * pos_p)
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{
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LV_UNUSED(drv);
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*pos_p = ftell(file_p);
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return LV_FS_RES_OK;
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}
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#ifdef WIN32
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static char next_fn[256];
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#endif
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/**
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* Initialize a 'DIR' or 'HANDLE' variable for directory reading
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* @param drv pointer to a driver where this function belongs
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* @param path path to a directory
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* @return pointer to an initialized 'DIR' or 'HANDLE' variable
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*/
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static void * fs_dir_open(lv_fs_drv_t * drv, const char * path)
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{
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LV_UNUSED(drv);
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#ifndef WIN32
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/*Make the path relative to the current directory (the projects root folder)*/
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char buf[256];
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lv_snprintf(buf, sizeof(buf), LV_FS_STDIO_PATH "%s", path);
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return opendir(buf);
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#else
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HANDLE d = INVALID_HANDLE_VALUE;
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WIN32_FIND_DATA fdata;
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/*Make the path relative to the current directory (the projects root folder)*/
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char buf[256];
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lv_snprintf(buf, sizeof(buf), LV_FS_STDIO_PATH "%s\\*", path);
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strcpy(next_fn, "");
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d = FindFirstFile(buf, &fdata);
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do {
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if(strcmp(fdata.cFileName, ".") == 0 || strcmp(fdata.cFileName, "..") == 0) {
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continue;
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}
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else {
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if(fdata.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
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sprintf(next_fn, "/%s", fdata.cFileName);
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}
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else {
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sprintf(next_fn, "%s", fdata.cFileName);
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}
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break;
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}
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} while(FindNextFileA(d, &fdata));
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return d;
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#endif
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}
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/**
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* Read the next filename form a directory.
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* The name of the directories will begin with '/'
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* @param drv pointer to a driver where this function belongs
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* @param dir_p pointer to an initialized 'DIR' or 'HANDLE' variable
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* @param fn pointer to a buffer to store the filename
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* @return LV_FS_RES_OK or any error from lv_fs_res_t enum
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*/
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static lv_fs_res_t fs_dir_read(lv_fs_drv_t * drv, void * dir_p, char * fn)
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{
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LV_UNUSED(drv);
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#ifndef WIN32
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struct dirent * entry;
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do {
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entry = readdir(dir_p);
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if(entry) {
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if(entry->d_type == DT_DIR) sprintf(fn, "/%s", entry->d_name);
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else strcpy(fn, entry->d_name);
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}
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else {
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strcpy(fn, "");
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}
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} while(strcmp(fn, "/.") == 0 || strcmp(fn, "/..") == 0);
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#else
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strcpy(fn, next_fn);
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strcpy(next_fn, "");
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WIN32_FIND_DATA fdata;
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if(FindNextFile(dir_p, &fdata) == false) return LV_FS_RES_OK;
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do {
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if(strcmp(fdata.cFileName, ".") == 0 || strcmp(fdata.cFileName, "..") == 0) {
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continue;
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}
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else {
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if(fdata.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
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sprintf(next_fn, "/%s", fdata.cFileName);
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}
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else {
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sprintf(next_fn, "%s", fdata.cFileName);
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}
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break;
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}
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} while(FindNextFile(dir_p, &fdata));
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#endif
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return LV_FS_RES_OK;
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}
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/**
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* Close the directory reading
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* @param drv pointer to a driver where this function belongs
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* @param dir_p pointer to an initialized 'DIR' or 'HANDLE' variable
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* @return LV_FS_RES_OK or any error from lv_fs_res_t enum
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*/
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static lv_fs_res_t fs_dir_close(lv_fs_drv_t * drv, void * dir_p)
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{
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LV_UNUSED(drv);
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#ifndef WIN32
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closedir(dir_p);
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#else
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FindClose(dir_p);
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#endif
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return LV_FS_RES_OK;
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}
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#else /*LV_USE_FS_STDIO == 0*/
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#if defined(LV_FS_STDIO_LETTER) && LV_FS_STDIO_LETTER != '\0'
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#warning "LV_USE_FS_STDIO is not enabled but LV_FS_STDIO_LETTER is set"
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#endif
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#endif /*LV_USE_FS_POSIX*/
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