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/*
$Id: stream.c,v 1.2 2004/04/11 12:20:32 miguelfreitas Exp $
Copyright (C) 2000 Herbert Valerio Riedel <hvr@gnu.org>
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 of the License, 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <cdio/cdio.h>
/* #define STREAM_DEBUG */
/* Public headers */
#include <libvcd/logging.h>
/* Private headers */
#include "vcd_assert.h"
#include "stream.h"
#include "util.h"
static const char _rcsid[] = "$Id: stream.c,v 1.2 2004/04/11 12:20:32 miguelfreitas Exp $";
/*
* DataSource implementations
*/
struct _VcdDataSink {
void* user_data;
vcd_data_sink_io_functions op;
int is_open;
long position;
};
static void
_vcd_data_sink_open_if_necessary(VcdDataSink *obj)
{
vcd_assert (obj != NULL);
if (!obj->is_open) {
if ((obj->op.open) (obj->user_data))
vcd_error("could not opening output stream...");
else {
obj->is_open = 1;
obj->position = 0;
}
}
}
VcdDataSink*
vcd_data_sink_new(void *user_data, const vcd_data_sink_io_functions *funcs)
{
VcdDataSink *new_obj;
new_obj = _vcd_malloc(sizeof(VcdDataSink));
new_obj->user_data = user_data;
memcpy(&(new_obj->op), funcs, sizeof(vcd_data_sink_io_functions));
return new_obj;
}
long
vcd_data_sink_seek(VcdDataSink* obj, long offset)
{
vcd_assert (obj != NULL);
_vcd_data_sink_open_if_necessary(obj);
if (obj->position != offset) {
vcd_warn("had to reposition DataSink from %ld to %ld!", obj->position, offset);
obj->position = offset;
return obj->op.seek(obj->user_data, offset);
}
return 0;
}
long
vcd_data_sink_write(VcdDataSink* obj, const void *ptr, long size, long nmemb)
{
long written;
vcd_assert (obj != NULL);
_vcd_data_sink_open_if_necessary(obj);
written = obj->op.write(obj->user_data, ptr, size*nmemb);
obj->position += written;
return written;
}
long
vcd_data_sink_printf (VcdDataSink *obj, const char format[], ...)
{
char buf[4096] = { 0, };
long retval;
int len;
va_list args;
va_start (args, format);
len = vsnprintf (buf, sizeof(buf), format, args);
if (len < 0 || len > (sizeof (buf) - 1))
vcd_error ("vsnprintf() returned %d", len);
retval = vcd_data_sink_write (obj, buf, 1, len);
va_end (args);
return retval;
}
void
vcd_data_sink_close(VcdDataSink* obj)
{
vcd_assert (obj != NULL);
if (obj->is_open) {
obj->op.close(obj->user_data);
obj->is_open = 0;
obj->position = 0;
}
}
void
vcd_data_sink_destroy(VcdDataSink* obj)
{
vcd_assert (obj != NULL);
vcd_data_sink_close(obj);
obj->op.free(obj->user_data);
}
/*
* DataSource implementations
*/
struct _VcdDataSource {
void* user_data;
vcd_data_source_io_functions op;
int is_open;
long position;
};
static void
_vcd_data_source_open_if_necessary(VcdDataSource *obj)
{
vcd_assert (obj != NULL);
if (!obj->is_open) {
if ((obj->op.open) (obj->user_data))
vcd_error ("could not opening input stream...");
else {
#ifdef STREAM_DEBUG
vcd_debug ("opened source...");
#endif
obj->is_open = 1;
obj->position = 0;
}
}
}
long
vcd_data_source_seek(VcdDataSource* obj, long offset)
{
vcd_assert (obj != NULL);
_vcd_data_source_open_if_necessary(obj);
if (obj->position != offset) {
#ifdef STREAM_DEBUG
vcd_warn("had to reposition DataSource from %ld to %ld!", obj->position, offset);
#endif
obj->position = offset;
return obj->op.seek(obj->user_data, offset);
}
return 0;
}
VcdDataSource*
vcd_data_source_new(void *user_data, const vcd_data_source_io_functions *funcs)
{
VcdDataSource *new_obj;
new_obj = _vcd_malloc (sizeof (VcdDataSource));
new_obj->user_data = user_data;
memcpy(&(new_obj->op), funcs, sizeof(vcd_data_source_io_functions));
return new_obj;
}
long
vcd_data_source_read(VcdDataSource* obj, void *ptr, long size, long nmemb)
{
long read_bytes;
vcd_assert (obj != NULL);
_vcd_data_source_open_if_necessary(obj);
read_bytes = obj->op.read(obj->user_data, ptr, size*nmemb);
obj->position += read_bytes;
return read_bytes;
}
long
vcd_data_source_stat(VcdDataSource* obj)
{
vcd_assert (obj != NULL);
_vcd_data_source_open_if_necessary(obj);
return obj->op.stat(obj->user_data);
}
void
vcd_data_source_close(VcdDataSource* obj)
{
vcd_assert (obj != NULL);
if (obj->is_open) {
#ifdef STREAM_DEBUG
vcd_debug ("closed source...");
#endif
obj->op.close(obj->user_data);
obj->is_open = 0;
obj->position = 0;
}
}
void
vcd_data_source_destroy(VcdDataSource* obj)
{
vcd_assert (obj != NULL);
vcd_data_source_close(obj);
obj->op.free(obj->user_data);
}
/*
* Local variables:
* c-file-style: "gnu"
* tab-width: 8
* indent-tabs-mode: nil
* End:
*/
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