static void
pull_and_push(XferElementGlue *self)
{
XferElement *elt = XFER_ELEMENT(self);
gboolean eof_sent = FALSE;
while (!elt->cancelled) {
char *buf;
size_t len;
/* get a buffer from upstream */
buf = xfer_element_pull_buffer(elt->upstream, &len);
/* and push it downstream */
xfer_element_push_buffer(elt->downstream, buf, len);
if (!buf) {
eof_sent = TRUE;
break;
}
}
if (elt->cancelled && elt->expect_eof)
xfer_element_drain_buffers(elt->upstream);
if (!eof_sent)
xfer_element_push_buffer(elt->downstream, NULL, 0);
}
static void
read_and_push(
XferElementGlue *self)
{
XferElement *elt = XFER_ELEMENT(self);
int fd = get_read_fd(self);
XMsg *msg;
crc32_init(&elt->crc);
while (!elt->cancelled) {
char *buf = g_malloc(GLUE_BUFFER_SIZE);
gsize len;
int read_error;
/* read a buffer from upstream */
len = read_fully(fd, buf, GLUE_BUFFER_SIZE, &read_error);
if (len < GLUE_BUFFER_SIZE) {
if (read_error) {
if (!elt->cancelled) {
xfer_cancel_with_error(elt,
_("Error reading from fd %d: %s"), fd, strerror(read_error));
g_debug("element-glue: error reading from fd %d: %s",
fd, strerror(read_error));
wait_until_xfer_cancelled(elt->xfer);
}
amfree(buf);
break;
} else if (len == 0) { /* we only count a zero-length read as EOF */
amfree(buf);
break;
}
}
crc32_add((uint8_t *)buf, len, &elt->crc);
xfer_element_push_buffer(elt->downstream, buf, len);
}
if (elt->cancelled && elt->expect_eof)
xfer_element_drain_fd(fd);
/* send an EOF indication downstream */
xfer_element_push_buffer(elt->downstream, NULL, 0);
/* close the read fd, since it's at EOF */
close_read_fd(self);
g_debug("sending XMSG_CRC message");
g_debug("read_and_push CRC: %08x size %lld",
crc32_finish(&elt->crc), (long long)elt->crc.size);
msg = xmsg_new(elt->upstream, XMSG_CRC, 0);
msg->crc = crc32_finish(&elt->crc);
msg->size = elt->crc.size;
xfer_queue_message(elt->xfer, msg);
}
static void
push_buffer_impl(
XferElement *elt,
gpointer buf,
size_t len)
{
XferFilterCrc *self = (XferFilterCrc *)elt;
XMsg *msg;
/* drop the buffer if we've been cancelled */
if (elt->cancelled) {
amfree(buf);
return;
}
/* crc the given buffer and pass it downstream */
if (buf) {
crc32_add((uint8_t *)buf, len, &elt->crc);
} else {
g_debug("sending XMSG_CRC message to %p", elt);
g_debug("crc push_buffer CRC: %08x",
crc32_finish(&elt->crc));
msg = xmsg_new(elt, XMSG_CRC, 0);
msg->crc = crc32_finish(&elt->crc);
msg->size = elt->crc.size;
xfer_queue_message(elt->xfer, msg);
}
xfer_element_push_buffer(XFER_ELEMENT(self)->downstream, buf, len);
}