/**
* pka_manifest_compare:
* @a: A #PkaManifest.
* @b: A #PkaManifest.
*
* Standard qsort() style compare function.
*
* Returns: Less than zero if @a precedes @b. Greater than zero if @b
* precedes @a. Otherwise, zero.
* Side effects: None.
*/
gint
pka_manifest_compare (gconstpointer a, /* IN */
gconstpointer b) /* IN */
{
gint aid;
gint bid;
aid = pka_manifest_get_source_id((PkaManifest *)a);
bid = pka_manifest_get_source_id((PkaManifest *)b);
return aid - bid;
}
static gboolean
pka_encoder_real_encode_manifest (PkaManifest *manifest, /* IN */
guint8 **data, /* IN */
gsize *data_len) /* IN */
{
EggBuffer *buf, *mbuf, *ebuf;
struct timespec ts;
guint64 t;
const guint8 *tbuf;
gsize tlen;
gint rows;
gint i;
g_return_val_if_fail(manifest != NULL, FALSE);
g_return_val_if_fail(data != NULL, FALSE);
g_return_val_if_fail(data_len != NULL, FALSE);
ENTRY;
buf = egg_buffer_new();
/*
* Field 1: Timestamp. Currently encoded in microseconds. We should
* determine what we want to do long-term.
*/
pka_manifest_get_timespec(manifest, &ts);
timespec_to_usec(&ts, &t);
egg_buffer_write_tag(buf, 1, EGG_BUFFER_UINT64);
egg_buffer_write_uint64(buf, t);
/*
* Desired sample resolution. This allows us to save considerable
* width in the relative-timestamp per sample.
*/
egg_buffer_write_tag(buf, 2, EGG_BUFFER_ENUM);
egg_buffer_write_uint(buf, pka_manifest_get_resolution(manifest));
/*
* Source index offset within the channel.
*/
egg_buffer_write_tag(buf, 3, EGG_BUFFER_UINT);
egg_buffer_write_uint(buf, pka_manifest_get_source_id(manifest));
/*
* Create a new buffer for the repeated data series.
*/
ebuf = egg_buffer_new();
/*
* Write the manifest data description. This is a set of embedded
* messages within the message.
*/
rows = pka_manifest_get_n_rows(manifest);
for (i = 1; i <= rows; i++) {
mbuf = egg_buffer_new();
/*
* Write the row identifier.
*/
egg_buffer_write_tag(mbuf, 1, EGG_BUFFER_UINT);
egg_buffer_write_uint(mbuf, i);
/*
* Write the row type.
*/
egg_buffer_write_tag(mbuf, 2, EGG_BUFFER_ENUM);
egg_buffer_write_uint(mbuf, pka_manifest_get_row_type(manifest, i));
/*
* Write the row name.
*/
egg_buffer_write_tag(mbuf, 3, EGG_BUFFER_STRING);
egg_buffer_write_string(mbuf, pka_manifest_get_row_name(manifest, i));
/*
* Embed the message as a data blob.
*/
egg_buffer_get_buffer(mbuf, &tbuf, &tlen);
egg_buffer_write_data(ebuf, tbuf, tlen);
egg_buffer_unref(mbuf);
}
/*
* Add the repeated message length and data.
*/
egg_buffer_get_buffer(ebuf, &tbuf, &tlen);
egg_buffer_write_tag(buf, 4, EGG_BUFFER_REPEATED);
egg_buffer_write_data(buf, tbuf, tlen);
egg_buffer_unref(ebuf);
/*
* Copy the buffer to the destination.
*/
egg_buffer_get_buffer(buf, &tbuf, &tlen);
*data = g_malloc(tlen);
*data_len = tlen;
memcpy(*data, tbuf, tlen);
egg_buffer_unref(buf);
RETURN(TRUE);
}
