gambas-source-code/main/gbx/gbx_stream_memory.c

186 lines
3.4 KiB
C

/***************************************************************************
gbx_stream_memory.c
(c) 2000-2017 Benoît Minisini <g4mba5@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301, USA.
***************************************************************************/
#define __STREAM_IMPL_C
#include "gb_common.h"
#include "gb_common_check.h"
#include "gb_error.h"
#include "gbx_value.h"
#include "gb_limit.h"
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <errno.h>
#include <signal.h>
#include <setjmp.h>
#include "gbx_stream.h"
static int stream_open(STREAM *stream, const char *path, int mode)
{
stream->memory.addr = (char *)path;
if (stream->memory.addr == NULL)
{
stream->type = NULL;
THROW(E_ARG);
}
stream->memory.pos = 0;
stream->common.available_now = TRUE;
return FALSE;
}
static int stream_close(STREAM *stream)
{
/*if (munmap(stream->memory.addr, stream->memory.size) != 0)
return TRUE;*/
stream->memory.addr = NULL;
//stream->memory.size = 0;
return FALSE;
}
static int stream_read(STREAM *stream, char *buffer, int len)
{
/*if ((stream->common.mode & STO_READ) == 0)
THROW(E_ACCESS);*/
CHECK_enter();
if (sigsetjmp(CHECK_jump, TRUE) == 0)
memmove(buffer, stream->memory.addr + stream->memory.pos, len);
CHECK_leave();
if (CHECK_got_error())
{
errno = EIO;
return -1;
}
else
{
stream->memory.pos += len;
return len;
}
}
static int stream_write(STREAM *stream, char *buffer, int len)
{
if ((stream->common.mode & STO_WRITE) == 0)
THROW(E_ACCESS);
CHECK_enter();
if (sigsetjmp(CHECK_jump, TRUE) == 0)
memmove(stream->memory.addr + stream->memory.pos, buffer, len);
CHECK_leave();
if (CHECK_got_error())
{
errno = EIO;
return -1;
}
else
{
stream->memory.pos += len;
return len;
}
}
static int stream_seek(STREAM *stream, int64_t pos, int whence)
{
int64_t new_pos;
switch(whence)
{
case SEEK_SET:
new_pos = pos;
break;
case SEEK_CUR:
new_pos = stream->memory.pos + pos;
break;
case SEEK_END:
return TRUE;
default:
return TRUE;
}
if (new_pos < 0)
return TRUE;
stream->memory.pos = new_pos;
return FALSE;
}
static int stream_tell(STREAM *stream, int64_t *pos)
{
*pos = (int64_t)stream->memory.pos;
return FALSE;
}
static int stream_flush(STREAM *stream)
{
return FALSE;
}
static int stream_eof(STREAM *stream)
{
//return (stream->memory.pos >= stream->memory.size);
return FALSE;
}
static int stream_lof(STREAM *stream, int64_t *len)
{
//*len = stream->memory.size;
//return FALSE;
*len = 0;
return TRUE;
}
static int stream_handle(STREAM *stream)
{
return -1;
}
DECLARE_STREAM(STREAM_memory);