187 lines
3.5 KiB
C
187 lines
3.5 KiB
C
/***************************************************************************
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gbx_stream_memory.c
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(c) 2000-2017 Benoît Minisini <benoit.minisini@gambas-basic.org>
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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; either version 2, or (at your option)
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any later version.
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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., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA.
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***************************************************************************/
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#define __STREAM_IMPL_C
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#include "gb_common.h"
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#include "gb_common_check.h"
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#include "gb_error.h"
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#include "gbx_value.h"
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#include "gb_limit.h"
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <errno.h>
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#include <signal.h>
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#include <setjmp.h>
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#include "gbx_stream.h"
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static int stream_open(STREAM *stream, const char *path, int mode)
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{
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stream->memory.addr = (char *)path;
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if (stream->memory.addr == NULL)
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{
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stream->type = NULL;
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THROW(E_ARG);
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}
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stream->memory.pos = 0;
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stream->common.available_now = TRUE;
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stream->common.null_terminated = TRUE;
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return FALSE;
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}
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static int stream_close(STREAM *stream)
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{
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/*if (munmap(stream->memory.addr, stream->memory.size) != 0)
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return TRUE;*/
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stream->memory.addr = NULL;
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//stream->memory.size = 0;
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return FALSE;
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}
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static int stream_read(STREAM *stream, char *buffer, int len)
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{
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/*if ((stream->common.mode & GB_ST_READ) == 0)
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THROW(E_ACCESS);*/
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CHECK_enter();
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if (sigsetjmp(CHECK_jump, TRUE) == 0)
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memmove(buffer, stream->memory.addr + stream->memory.pos, len);
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CHECK_leave();
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if (CHECK_got_error())
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{
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errno = EIO;
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return -1;
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}
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else
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{
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stream->memory.pos += len;
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return len;
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}
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}
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static int stream_write(STREAM *stream, char *buffer, int len)
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{
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if ((stream->common.mode & GB_ST_WRITE) == 0)
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THROW(E_ACCESS);
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CHECK_enter();
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if (sigsetjmp(CHECK_jump, TRUE) == 0)
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memmove(stream->memory.addr + stream->memory.pos, buffer, len);
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CHECK_leave();
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if (CHECK_got_error())
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{
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errno = EIO;
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return -1;
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}
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else
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{
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stream->memory.pos += len;
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return len;
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}
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}
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static int stream_seek(STREAM *stream, int64_t pos, int whence)
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{
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int64_t new_pos;
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switch(whence)
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{
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case SEEK_SET:
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new_pos = pos;
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break;
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case SEEK_CUR:
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new_pos = stream->memory.pos + pos;
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break;
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case SEEK_END:
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return TRUE;
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default:
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return TRUE;
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}
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if (new_pos < 0)
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return TRUE;
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stream->memory.pos = new_pos;
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return FALSE;
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}
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static int stream_tell(STREAM *stream, int64_t *pos)
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{
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*pos = (int64_t)stream->memory.pos;
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return FALSE;
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}
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static int stream_flush(STREAM *stream)
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{
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return FALSE;
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}
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static int stream_eof(STREAM *stream)
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{
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//return (stream->memory.pos >= stream->memory.size);
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return FALSE;
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}
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static int stream_lof(STREAM *stream, int64_t *len)
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{
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//*len = stream->memory.size;
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//return FALSE;
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*len = 0;
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return TRUE;
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}
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static int stream_handle(STREAM *stream)
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{
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return -1;
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}
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DECLARE_STREAM(STREAM_memory);
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