static ssize_t ci_ll_read(struct dvb_ringbuffer *cibuf, struct file *file,
char __user *buf, size_t count, loff_t *ppos)
{
int avail;
int non_blocking = file->f_flags & O_NONBLOCK;
ssize_t len;
if (!cibuf->data || !count)
return 0;
if (non_blocking && (dvb_ringbuffer_empty(cibuf)))
return -EWOULDBLOCK;
if (wait_event_interruptible(cibuf->queue,
!dvb_ringbuffer_empty(cibuf)))
return -ERESTARTSYS;
avail = dvb_ringbuffer_avail(cibuf);
if (avail < 4)
return 0;
len = DVB_RINGBUFFER_PEEK(cibuf, 0) << 8;
len |= DVB_RINGBUFFER_PEEK(cibuf, 1);
if (avail < len + 2 || count < len)
return -EINVAL;
DVB_RINGBUFFER_SKIP(cibuf, 2);
return dvb_ringbuffer_read(cibuf, buf, len, 1);
}
static ssize_t dvb_dmxdev_buffer_read(struct dvb_ringbuffer *src,
int non_blocking, char __user *buf,
size_t count, loff_t *ppos)
{
size_t todo;
ssize_t avail;
ssize_t ret = 0;
if (!src->data)
return 0;
if (src->error) {
ret = src->error;
dvb_ringbuffer_flush(src);
return ret;
}
for (todo = count; todo > 0; todo -= ret) {
if (non_blocking && dvb_ringbuffer_empty(src)) {
ret = -EWOULDBLOCK;
break;
}
ret = wait_event_interruptible(src->queue,
!dvb_ringbuffer_empty(src) ||
(src->error != 0));
if (ret < 0)
break;
if (src->error) {
ret = src->error;
dvb_ringbuffer_flush(src);
break;
}
avail = dvb_ringbuffer_avail(src);
if (avail > todo)
avail = todo;
ret = dvb_ringbuffer_read(src, (u8 *)buf, avail, 1);
if (ret < 0)
break;
buf += ret;
}
return (count - todo) ? (count - todo) : ret;
}
ssize_t mpq_streambuffer_data_read(
struct mpq_streambuffer *sbuff,
u8 *buf, size_t len)
{
ssize_t actual_len = 0;
if ((NULL == sbuff) || (NULL == buf))
return -EINVAL;
if (MPQ_STREAMBUFFER_BUFFER_MODE_RING == sbuff->mode) {
/*
* Secure buffers are not permitted to be mapped into kernel
* memory, and so buffer base address may be NULL
*/
if (NULL == sbuff->raw_data.data)
return -EPERM;
actual_len = dvb_ringbuffer_avail(&sbuff->raw_data);
if (actual_len < len)
len = actual_len;
if (len)
dvb_ringbuffer_read(&sbuff->raw_data, buf, len);
wake_up_all(&sbuff->raw_data.queue);
} else {
/* Linear buffer group */
struct mpq_streambuffer_buffer_desc *desc;
desc = (struct mpq_streambuffer_buffer_desc *)
&sbuff->raw_data.data[sbuff->raw_data.pread];
/*
* Secure buffers are not permitted to be mapped into kernel
* memory, and so buffer base address may be NULL
*/
if (NULL == desc->base)
return -EPERM;
actual_len = (desc->write_ptr - desc->read_ptr);
if (actual_len < len)
len = actual_len;
memcpy(buf, desc->base + desc->read_ptr, len);
desc->read_ptr += len;
}
return len;
}
void *tsout_exchange(void *priv, void *buf, u32 len, u32 clock, u32 flags)
{
struct ngene_channel *chan = priv;
struct ngene *dev = chan->dev;
u32 alen;
alen = dvb_ringbuffer_avail(&dev->tsout_rbuf);
alen -= alen % 188;
if (alen < len)
FillTSBuffer(buf + alen, len - alen, flags);
else
alen = len;
dvb_ringbuffer_read(&dev->tsout_rbuf, buf, alen);
if (flags & DF_SWAP32)
swap_buffer((u32 *)buf, alen);
wake_up_interruptible(&dev->tsout_rbuf.queue);
return buf;
}