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/* Copyright (c) 2010 James Snyder, eLua Project.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the right
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <string.h>
#include <errno.h>
#include <stdint.h>
#ifdef USE_NEWLIB
#include <fcntl.h>
#endif
#include <angel.h>
#include "filesystem.h"
#include "fio.h"
#include "semifs.h"
#include "osdebug.h"
struct semifs_fds_t {
uint32_t file;
uint32_t cursor;
};
static struct semifs_fds_t semifs_fds[MAX_FDS];
// These structures provided by Simon Ford of mbed
struct semifs_FTime {
uint8_t hr; // Hours [0..23]
uint8_t min; // Minutes [0..59]
uint8_t sec; // Seconds [0..59]
uint8_t day; // Day [1..31]
uint8_t mon; // Month [1..12]
uint16_t year; // Year [1980..2107]
};
// File Search info record
struct semifs_XF_Info {
char name[32]; // File - 32-bytes
uint32_t size; // File size in bytes - 4-bytes
uint16_t fileID; // System File Identification - 2-bytes
struct semifs_FTime create_time; // Date & time file was created
struct semifs_FTime write_time; // Date & time of last write
};
struct semifs_SearchInfo {
const char *pattern;
struct semifs_XF_Info file_info;
};
/*****************************************************************************/
static int semifs_close(void * opaque) {
struct semifs_fds_t * f = (struct semifs_fds_t *) opaque;
// DBGOUT("semifs_close(%p)\r\n", opaque);
return Semihost_SYS_CLOSE(&f->file);
}
static ssize_t semifs_write(void * opaque, const void * ptr, size_t len) {
struct semifs_fds_t * f = (struct semifs_fds_t *) opaque;
// DBGOUT("semifs_write(%p, %p, %i)\r\n", opaque, ptr, len);
uint32_t args[3];
args[0] = (uint32_t) f->file;
args[1] = (uint32_t) ptr;
args[2] = (uint32_t) len;
// Perform write
int res = Semihost_SYS_WRITE(args);
// DBGOUT("semifs_read: Semihost_SYS_WRITE returned %i\r\n", res);
if (res == -1 || res == len)
return -1;
// Update position
f->cursor += len - res;
return len - res;
}
static ssize_t semifs_read(void * opaque, void * ptr, size_t len) {
struct semifs_fds_t * f = (struct semifs_fds_t *) opaque;
// DBGOUT("semifs_read(%p, %p, %i)\r\n", opaque, ptr, len);
uint32_t args[3];
args[0] = (uint32_t) f->file;
args[1] = (uint32_t) ptr;
args[2] = (uint32_t) len;
// Perform read
int res = Semihost_SYS_READ(args);
// DBGOUT("semifs_read: Semihost_SYS_READ returned %i\r\n", res);
if (res < 0)
return -1;
// Update position
f->cursor += len - res;
return len - res;
}
static off_t semifs_seek(void * opaque, off_t off, int whence) {
uint32_t args[2], len;
struct semifs_fds_t * f = (struct semifs_fds_t *) opaque;
// DBGOUT("semifs_seek(%p, %i, %i)\r\n", opaque, off, whence);
switch (whence) {
case SEEK_CUR:
// seek from current position
off += f->cursor;
whence = SEEK_SET;
break;
case SEEK_END:
// seek from end of file
args[0] = (uint32_t) f->file;
len = Semihost_SYS_FLEN(args);
// DBGOUT("semifs_seek: Semihost_SYS_FLEN returned %i\r\n", len);
off += len;
break;
}
// Do absolute seek
args[0] = (uint32_t) f->file;
args[1] = (uint32_t) off;
int res = Semihost_SYS_SEEK(args);
// DBGOUT("semifs_seek: Semihost_SYS_SEEK returned %i\r\n", res);
if (res == 0)
f->cursor = off;
/* This is expected to return the position in the file. */
return res == 0 ? off : -1;
}
static int semifs_open(void * opaque, const char *path, int flags, int mode) {
int aflags = 0;
unsigned int fh;
uint32_t args[3];
// DBGOUT("semifs_open(%p, \"%s\", %i, %i)\r\n");
if (flags & O_RDWR)
aflags |= 2;
if (flags & O_CREAT)
aflags |= 4;
if (flags & O_TRUNC)
aflags |= 4;
if (flags & O_APPEND) {
aflags &= ~4; // Can't ask for w AND a; means just 'a'.
aflags |= 8;
}
// Find file and open it (via semihosting call)
args[0] = (uint32_t) path;
args[1] = (uint32_t) aflags;
args[2] = (uint32_t) strlen(path);
fh = Semihost_SYS_OPEN(args);
// DBGOUT("Semihost_SYS_OPEN returns: %i\r\n", fh);
if (fh >= 0) {
int fd = fio_open(semifs_read, semifs_write, semifs_seek, semifs_close, (void *) fh);
// DBGOUT("semifs_open: fio_open returned %i\r\n", fd);
if (fd < 0)
Semihost_SYS_CLOSE((uint32_t *) &fd);
semifs_fds[fd].file = fh;
semifs_fds[fd].cursor = 0;
fio_set_opaque(fd, semifs_fds + fd);
return fd;
}
return -1;
}
void register_semifs() {
// DBGOUT("Registering semihost fs\r\n");
register_fs("host", semifs_open, NULL);
}
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