From: Gerhard Sittig <redacted>
Date: Sun, 4 Feb 2018 18:12:48 +0000 (+0100)
Subject: instance: make sure oldpins array is available after reset
X-Git-Url: https://sigrok.org/gitweb/?p=libsigrokdecode.git;a=commitdiff_plain;h=63bbdb445fc2ade82c15766b419c869a41ed8f38

instance: make sure oldpins array is available after reset

Introduce an oldpins_array_seed() helper routine, to make sure that each
call site which checks previous pin state will find valid data. This was
not always the case after decoder reset, which released the old pin data
while applications would not call srd_inst_new() again.

Preset newly allocated arrays with the default initial pin state, allow
optional application calls to specify differing initial values (when
specified by users), and keep the current state after first data was
processed.
---

diff --git a/instance.c b/instance.c
index 81ce3fd..5281510 100644
--- a/instance.c
+++ b/instance.c
@@ -32,6 +32,7 @@ extern SRD_PRIV GSList *sessions;
 
 static void srd_inst_join_decode_thread(struct srd_decoder_inst *di);
 static void srd_inst_reset_state(struct srd_decoder_inst *di);
+SRD_PRIV void oldpins_array_seed(struct srd_decoder_inst *di);
 SRD_PRIV void oldpins_array_free(struct srd_decoder_inst *di);
 
 /** @endcond */
@@ -363,11 +364,7 @@ SRD_API struct srd_decoder_inst *srd_inst_new(struct srd_session *sess,
 	}
 
 	/* Default to the initial pins being the same as in sample 0. */
-	di->old_pins_array = g_array_sized_new(FALSE, TRUE, sizeof(uint8_t),
-						di->dec_num_channels);
-	g_array_set_size(di->old_pins_array, di->dec_num_channels);
-	memset(di->old_pins_array->data, SRD_INITIAL_PIN_SAME_AS_SAMPLE0,
-		di->dec_num_channels);
+	oldpins_array_seed(di);
 
 	gstate = PyGILState_Ensure();
 
@@ -678,6 +675,7 @@ SRD_API int srd_inst_initial_pins_set_all(struct srd_decoder_inst *di, GArray *i
 	}
 
 	s = g_string_sized_new(100);
+	oldpins_array_seed(di);
 	for (i = 0; i < di->dec_num_channels; i++) {
 		di->old_pins_array->data[i] = initial_pins->data[i];
 		g_string_append_printf(s, "%d, ", di->old_pins_array->data[i]);
@@ -689,6 +687,25 @@ SRD_API int srd_inst_initial_pins_set_all(struct srd_decoder_inst *di, GArray *i
 	return SRD_OK;
 }
 
+/** @private */
+SRD_PRIV void oldpins_array_seed(struct srd_decoder_inst *di)
+{
+	size_t count;
+	GArray *arr;
+
+	if (!di)
+		return;
+	if (di->old_pins_array)
+		return;
+
+	srd_dbg("%s: Seeding old pins, %s().", di->inst_id, __func__);
+	count = di->dec_num_channels;
+	arr = g_array_sized_new(FALSE, TRUE, sizeof(uint8_t), count);
+	g_array_set_size(arr, count);
+	memset(arr->data, SRD_INITIAL_PIN_SAME_AS_SAMPLE0, count);
+	di->old_pins_array = arr;
+}
+
 /** @private */
 SRD_PRIV void oldpins_array_free(struct srd_decoder_inst *di)
 {
@@ -854,6 +871,7 @@ static void update_old_pins_array(struct srd_decoder_inst *di,
 	if (!di || !di->dec_channelmap || !sample_pos)
 		return;
 
+	oldpins_array_seed(di);
 	for (i = 0; i < di->dec_num_channels; i++) {
 		byte_offset = di->dec_channelmap[i] / 8;
 		bit_offset = di->dec_channelmap[i] % 8;
@@ -873,6 +891,7 @@ static void update_old_pins_array_initial_pins(struct srd_decoder_inst *di)
 
 	sample_pos = di->inbuf + ((di->abs_cur_samplenum - di->abs_start_samplenum) * di->data_unitsize);
 
+	oldpins_array_seed(di);
 	for (i = 0; i < di->dec_num_channels; i++) {
 		if (di->old_pins_array->data[i] != SRD_INITIAL_PIN_SAME_AS_SAMPLE0)
 			continue;