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/**
* @file obex_hdr_stream.c
*
* OBEX header releated functions.
* OpenOBEX library - Free implementation of the Object Exchange protocol.
*
* Copyright (c) 2012 Hendrik Sattler, All Rights Reserved.
*
* OpenOBEX is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation; either version 2.1 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 Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with OpenOBEX. If not, see <http://www.gnu.org/>.
*/
#include <obex_hdr.h>
#include <obex_main.h>
#include <obex_object.h>
struct obex_hdr_stream {
struct obex *obex;
/** Pointer to streaming data */
struct obex_hdr *data;
/** Current offset in buf */
size_t s_offset;
/** End of stream */
bool s_stop;
};
static
void obex_hdr_stream_destroy(void *self)
{
struct obex_hdr_stream *hdr = self;
obex_hdr_destroy(hdr->data);
free(hdr);
}
static
enum obex_hdr_id obex_hdr_stream_get_id(void *self)
{
struct obex_hdr_stream *hdr = self;
return obex_hdr_get_id(hdr->data);
}
static
enum obex_hdr_type obex_hdr_stream_get_type(void *self)
{
struct obex_hdr_stream *hdr = self;
return obex_hdr_get_type(hdr->data);
}
static
void obex_hdr_stream_refresh(struct obex_hdr_stream *hdr)
{
if (!hdr->s_stop) {
struct obex *obex = hdr->obex;
struct obex_object *object = obex->object;
enum obex_cmd cmd = obex_object_getcmd(object);
/* Ask app for more data if no more */
obex_hdr_set_data(hdr->data, NULL, 0);
hdr->s_offset = 0;
obex_deliver_event(obex, OBEX_EV_STREAMEMPTY, cmd, 0, FALSE);
DEBUG(4, "s_size=%lu, s_stop=%d\n",
(unsigned long)obex_hdr_get_data_size(hdr->data),
hdr->s_stop);
}
}
static
size_t obex_hdr_stream_get_data_size(void *self)
{
struct obex_hdr_stream *hdr = self;
size_t data_size = obex_hdr_get_data_size(hdr->data) - hdr->s_offset;
if (data_size == 0) {
obex_hdr_stream_refresh(hdr);
data_size = obex_hdr_get_data_size(hdr->data) - hdr->s_offset;
}
return data_size;
}
static
const void * obex_hdr_stream_get_data_ptr(void *self)
{
struct obex_hdr_stream *hdr = self;
const void *ptr = obex_hdr_get_data_ptr(hdr->data);
if (ptr == NULL)
return NULL;
else
return (uint8_t *)ptr + hdr->s_offset;
}
static
bool obex_hdr_stream_set_data(void *self, const void *data, size_t size)
{
struct obex_hdr_stream *hdr = self;
return obex_hdr_set_data(hdr->data, data, size);
}
static
size_t obex_hdr_stream_append_data(void *self, struct databuffer *buf,
size_t size)
{
struct obex_hdr_stream *hdr = self;
size_t ret = 0;
const void *ptr;
size_t data_size = obex_hdr_stream_get_data_size(hdr);
/* this function _must_ only be called _after_ get_data_size() */
ptr = obex_hdr_stream_get_data_ptr(hdr);
if (data_size == 0 || ptr == NULL)
return 0;
if (size < data_size) {
DEBUG(4, "More data than tx_left. Buffer will not be empty\n");
buf_append(buf, ptr, size);
hdr->s_offset += size;
ret += size;
} else {
DEBUG(4, "Less data than tx_left. Buffer will be empty\n");
ptr = obex_hdr_stream_get_data_ptr(self);
buf_append(buf, ptr, data_size);
hdr->s_offset += data_size;
ret += data_size;
}
return ret;
}
static
bool obex_hdr_stream_is_finished(void *self)
{
struct obex_hdr_stream *hdr = self;
return hdr->s_stop && (obex_hdr_stream_get_data_size(hdr) == 0);
}
static
struct obex_hdr_ops obex_hdr_stream_ops = {
&obex_hdr_stream_destroy,
&obex_hdr_stream_get_id,
&obex_hdr_stream_get_type,
&obex_hdr_stream_get_data_size,
&obex_hdr_stream_get_data_ptr,
&obex_hdr_stream_set_data,
&obex_hdr_stream_append_data,
&obex_hdr_stream_is_finished,
};
struct obex_hdr * obex_hdr_stream_create(struct obex *obex,
struct obex_hdr *data)
{
struct obex_hdr_stream *hdr = calloc(1, sizeof(*hdr));
if (!hdr)
return NULL;
hdr->obex = obex;
hdr->data = data;
return obex_hdr_new(&obex_hdr_stream_ops, hdr);
}
void obex_hdr_stream_finish(struct obex_hdr *hdr)
{
struct obex_hdr_stream *s = hdr->data;
s->s_stop = true;
}
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