From a6f211d0fdf4b849459c44e66131e54f4d7bfda2 Mon Sep 17 00:00:00 2001
From: JP Cimalando <jpcima@users.noreply.github.com>
Date: Sun, 22 Apr 2018 18:39:23 +0200
Subject: implement copy for OplChannel, and move implementations in .cpp

---
 src/adlmidi_midiplay.cpp | 130 +++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 119 insertions(+), 11 deletions(-)

(limited to 'src/adlmidi_midiplay.cpp')

diff --git a/src/adlmidi_midiplay.cpp b/src/adlmidi_midiplay.cpp
index 88c1b39..7c40fa0 100644
--- a/src/adlmidi_midiplay.cpp
+++ b/src/adlmidi_midiplay.cpp
@@ -2434,17 +2434,7 @@ uint64_t MIDIplay::ChooseDevice(const std::string &name)
 
     size_t n = devices.size() * 16;
     devices.insert(std::make_pair(name, n));
-
-    size_t channelsBefore = Ch.size();
-    size_t channels = n + 16;
-    Ch.resize(channels);
-
-    for(size_t ch = channelsBefore; ch < channels; ++ch) {
-        for(unsigned i = 0; i < 128; ++i) {
-            Ch[ch].activenotes[i].note = i;
-            Ch[ch].activenotes[i].active = false;
-        }
-    }
+    Ch.resize(n + 16);
     return n;
 }
 
@@ -2708,3 +2698,121 @@ ADLMIDI_EXPORT bool AdlInstrumentTester::HandleInputChar(char ch)
 }
 
 #endif//ADLMIDI_DISABLE_CPP_EXTRAS
+
+// Implement the user map data structure.
+
+bool MIDIplay::AdlChannel::users_empty() const
+{
+    return !users_first;
+}
+
+MIDIplay::AdlChannel::LocationData *MIDIplay::AdlChannel::users_find(Location loc)
+{
+    LocationData *user = NULL;
+    for(LocationData *curr = users_first; !user && curr; curr = curr->next)
+        if(curr->loc == loc)
+            user = curr;
+    return user;
+}
+
+MIDIplay::AdlChannel::LocationData *MIDIplay::AdlChannel::users_allocate()
+{
+    // remove free cells front
+    LocationData *user = users_free_cells;
+    if(!user)
+        return NULL;
+    users_free_cells = user->next;
+    if(users_free_cells)
+        users_free_cells->prev = NULL;
+    // add to users front
+    if(users_first)
+        users_first->prev = user;
+    user->prev = NULL;
+    user->next = users_first;
+    users_first = user;
+    ++users_size;
+    return user;
+}
+
+MIDIplay::AdlChannel::LocationData *MIDIplay::AdlChannel::users_find_or_create(Location loc)
+{
+    LocationData *user = users_find(loc);
+    if(!user) {
+        user = users_allocate();
+        if(!user)
+            return NULL;
+        LocationData *prev = user->prev, *next = user->next;
+        *user = LocationData();
+        user->prev = prev; user->next = next;
+        user->loc = loc;
+    }
+    return user;
+}
+
+MIDIplay::AdlChannel::LocationData *MIDIplay::AdlChannel::users_insert(const LocationData &x)
+{
+    LocationData *user = users_find(x.loc);
+    if(!user)
+    {
+        user = users_allocate();
+        if(!user)
+            return NULL;
+        LocationData *prev = user->prev, *next = user->next;
+        *user = x;
+        user->prev = prev; user->next = next;
+    }
+    return user;
+}
+
+void MIDIplay::AdlChannel::users_erase(LocationData *user)
+{
+    if(user->prev)
+        user->prev->next = user->next;
+    if(user->next)
+        user->next->prev = user->prev;
+    if(user == users_first)
+        users_first = user->next;
+    user->prev = NULL;
+    user->next = users_free_cells;
+    users_free_cells = user;
+    --users_size;
+}
+
+void MIDIplay::AdlChannel::users_clear()
+{
+    users_first = NULL;
+    users_free_cells = users_cells;
+    users_size = 0;
+    for(size_t i = 0; i < users_max; ++i)
+    {
+        users_cells[i].prev = (i > 0) ? &users_cells[i - 1] : NULL;
+        users_cells[i].next = (i + 1 < users_max) ? &users_cells[i + 1] : NULL;
+    }
+}
+
+void MIDIplay::AdlChannel::users_assign(const LocationData *users, size_t count)
+{
+    assert(count <= users_max);
+    if(users == users_first && users) {
+        // self assignment
+        assert(users_size == count);
+        return;
+    }
+    users_clear();
+    const LocationData *src_cell = users;
+    // move to the last
+    if(src_cell) {
+        while(src_cell->next)
+            src_cell = src_cell->next;
+    }
+    // push cell copies in reverse order
+    while(src_cell) {
+        LocationData *dst_cell = users_allocate();
+        assert(dst_cell);
+        LocationData *prev = dst_cell->prev, *next = dst_cell->next;
+        *dst_cell = *src_cell;
+        dst_cell->prev = prev; dst_cell->next = next;
+        src_cell = src_cell->prev;
+    }
+    assert(users_size == count);
+}
-- 
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