118 lines
3.1 KiB
C
118 lines
3.1 KiB
C
/* sd2snes - SD card based universal cartridge for the SNES
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Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
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AVR firmware portion
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Inspired by and based on code from sd2iec, written by Ingo Korb et al.
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See sdcard.c|h, config.h.
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FAT file system access based on code by ChaN, Jim Brain, Ingo Korb,
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see ff.c|h.
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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; version 2 of the License only.
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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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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fileops.c: simple file access functions
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*/
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#include "config.h"
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#include "uart.h"
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#include "ff.h"
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#include "fileops.h"
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#include "diskio.h"
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/*
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WCHAR ff_convert(WCHAR w, UINT dir) {
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return w;
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}*/
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int newcard;
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void file_init() {
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file_res=f_mount(0, &fatfs);
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newcard = 0;
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}
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void file_reinit(void) {
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disk_init();
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file_init();
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}
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FRESULT dir_open_by_filinfo(DIR* dir, FILINFO* fno) {
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return l_opendirbycluster(&fatfs, dir, (TCHAR*)"", fno->clust);
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}
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void file_open_by_filinfo(FILINFO* fno) {
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file_res = l_openfilebycluster(&fatfs, &file_handle, (TCHAR*)"", fno->clust, fno->fsize);
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}
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void file_open(const uint8_t* filename, BYTE flags) {
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if (disk_state == DISK_CHANGED) {
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file_reinit();
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newcard = 1;
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}
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file_res = f_open(&file_handle, (TCHAR*)filename, flags);
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file_block_off = sizeof(file_buf);
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file_block_max = sizeof(file_buf);
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file_status = file_res ? FILE_ERR : FILE_OK;
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}
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void file_close() {
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file_res = f_close(&file_handle);
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}
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void file_seek(uint32_t offset) {
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file_res = f_lseek(&file_handle, (DWORD)offset);
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}
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UINT file_read() {
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UINT bytes_read;
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file_res = f_read(&file_handle, file_buf, sizeof(file_buf), &bytes_read);
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return bytes_read;
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}
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UINT file_write() {
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UINT bytes_written;
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file_res = f_write(&file_handle, file_buf, sizeof(file_buf), &bytes_written);
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if(bytes_written < sizeof(file_buf)) {
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printf("wrote less than expected - card full?\n");
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}
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return bytes_written;
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}
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UINT file_readblock(void* buf, uint32_t addr, uint16_t size) {
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UINT bytes_read;
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file_res = f_lseek(&file_handle, addr);
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if(file_handle.fptr != addr) {
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return 0;
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}
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file_res = f_read(&file_handle, buf, size, &bytes_read);
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return bytes_read;
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}
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UINT file_writeblock(void* buf, uint32_t addr, uint16_t size) {
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UINT bytes_written;
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file_res = f_lseek(&file_handle, addr);
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if(file_res) return 0;
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file_res = f_write(&file_handle, buf, size, &bytes_written);
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return bytes_written;
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}
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uint8_t file_getc() {
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if(file_block_off == file_block_max) {
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file_block_max = file_read();
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if(file_block_max == 0) file_status = FILE_EOF;
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file_block_off = 0;
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}
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return file_buf[file_block_off++];
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}
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