From 7be6121103ed6e0c9b631a0eb3cc0b120ee4a08d Mon Sep 17 00:00:00 2001
From: "Matthias P. Braendli" <matthias.braendli@mpb.li>
Date: Mon, 21 Dec 2015 20:08:58 +0100
Subject: Add component carousel to FIG0/3

---
 src/fig/FIG0.cpp | 43 +++++++++++++++++++++++++++----------------
 1 file changed, 27 insertions(+), 16 deletions(-)

(limited to 'src/fig/FIG0.cpp')

diff --git a/src/fig/FIG0.cpp b/src/fig/FIG0.cpp
index 57321ed..1e29ca5 100644
--- a/src/fig/FIG0.cpp
+++ b/src/fig/FIG0.cpp
@@ -342,7 +342,8 @@ FillStatus FIG0_2::fill(uint8_t *buf, size_t max_size)
 //=========== FIG 0/3 ===========
 
 FIG0_3::FIG0_3(FIGRuntimeInformation *rti) :
-    m_rti(rti)
+    m_rti(rti),
+    m_initialised(false)
 {
 }
 
@@ -352,26 +353,36 @@ FillStatus FIG0_3::fill(uint8_t *buf, size_t max_size)
     ssize_t remaining = max_size;
     auto ensemble = m_rti->ensemble;
 
+    if (not m_initialised) {
+        componentFIG0_3 = m_rti->ensemble->components.end();
+        m_initialised = true;
+    }
+
     FIGtype0_3_header *fig0_3_header = NULL;
     FIGtype0_3_data *fig0_3_data = NULL;
 
-    // TODO: implement component carousel
-    for (auto& component : ensemble->components) {
+    for (; componentFIG0_3 != ensemble->components.end();
+            ++componentFIG0_3) {
         auto subchannel = getSubchannel(ensemble->subchannels,
-                component->subchId);
+                (*componentFIG0_3)->subchId);
 
         if (subchannel == ensemble->subchannels.end()) {
             etiLog.log(error,
                     "Subchannel %i does not exist for component "
                     "of service %i\n",
-                    component->subchId, component->serviceId);
+                    (*componentFIG0_3)->subchId, (*componentFIG0_3)->serviceId);
             throw MuxInitException();
         }
 
         if ((*subchannel)->type != subchannel_type_t::Packet)
             continue;
 
+        const int required_size = 5 + (m_rti->factumAnalyzer ? 2 : 0);
+
         if (fig0_3_header == NULL) {
+            if (remaining < 2 + required_size) {
+                break;
+            }
             fig0_3_header = (FIGtype0_3_header*)buf;
             fig0_3_header->FIGtypeNumber = 0;
             fig0_3_header->Length = 1;
@@ -383,21 +394,24 @@ FillStatus FIG0_3::fill(uint8_t *buf, size_t max_size)
             buf += 2;
             remaining -= 2;
         }
+        else if (remaining < required_size) {
+            break;
+        }
 
         /*  Warning: When bit SCCA_flag is unset(0), the multiplexer
          *  R&S does not send the SCCA field. But, in the Factum ETI
          *  analyzer, if this field is not there, it is an error.
          */
         fig0_3_data = (FIGtype0_3_data*)buf;
-        fig0_3_data->setSCId(component->packet.id);
+        fig0_3_data->setSCId((*componentFIG0_3)->packet.id);
         fig0_3_data->rfa = 0;
         fig0_3_data->SCCA_flag = 0;
         // if 0, datagroups are used
-        fig0_3_data->DG_flag = !component->packet.datagroup;
+        fig0_3_data->DG_flag = !(*componentFIG0_3)->packet.datagroup;
         fig0_3_data->rfu = 0;
-        fig0_3_data->DSCTy = component->type;
+        fig0_3_data->DSCTy = (*componentFIG0_3)->type;
         fig0_3_data->SubChId = (*subchannel)->id;
-        fig0_3_data->setPacketAddress(component->packet.address);
+        fig0_3_data->setPacketAddress((*componentFIG0_3)->packet.address);
         if (m_rti->factumAnalyzer) {
             fig0_3_data->SCCA = 0;
         }
@@ -410,17 +424,14 @@ FillStatus FIG0_3::fill(uint8_t *buf, size_t max_size)
             buf += 2;
             remaining -= 2;
         }
+    }
 
-        if (remaining < 0) {
-            etiLog.level(error) <<
-                    "can't add FIG 0/3 to FIB, "
-                    "too many packet services";
-            throw MuxInitException();
-        }
+    if (componentFIG0_3 == ensemble->components.end()) {
+        componentFIG0_3 = ensemble->components.begin();
+        fs.complete_fig_transmitted = true;
     }
 
     fs.num_bytes_written = max_size - remaining;
-    fs.complete_fig_transmitted = true;
     return fs;
 }
 
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