Add support for title.db, and use title.db to augment TMD finding

Also added support for system title CIA building, and fixed various minor issues.
Also moved MakeMagic to Common.

src/core/ncch/cia_builder.cpp

@@ -175,7 +175,7 @@ bool CIABuilder::AddContent(u16 content_id, NCCHContainer& ncch) {
     file->SetHashEnabled(false);
 
     // DLCs do not have a meta
-    if (tmd_chunk.index != TMDContentIndex::Main || (tmd.GetTitleID() & 0x0004008c'00000000)) {
+    if (tmd_chunk.index != TMDContentIndex::Main || (tmd.GetTitleID() >> 32) == 0x0004008c) {
         return true;
     }
 

src/core/ncch/ncch_container.cpp

@@ -22,10 +22,6 @@
 
 namespace Core {
 
-constexpr u32 MakeMagic(char a, char b, char c, char d) {
-    return a | b << 8 | c << 16 | d << 24;
-}
-
 static const int kMaxSections = 8;   ///< Maximum number of sections (files) in an ExeFs
 static const int kBlockSize = 0x200; ///< Size of ExeFS blocks (in bytes)
 

src/core/ncch/smdh.cpp

@@ -4,15 +4,12 @@
 
 #include <cstring>
 #include <vector>
+#include "common/common_funcs.h"
 #include "common/common_types.h"
 #include "core/ncch/smdh.h"
 
 namespace Core {
 
-constexpr u32 MakeMagic(char a, char b, char c, char d) {
-    return a | b << 8 | c << 16 | d << 24;
-}
-
 // 8x8 Z-Order coordinate from 2D coordinates
 static constexpr u32 MortonInterleave(u32 x, u32 y) {
     constexpr u32 xlut[] = {0x00, 0x01, 0x04, 0x05, 0x10, 0x11, 0x14, 0x15};

src/core/ncch/title_metadata.cpp

@@ -207,6 +207,13 @@ const TitleMetadata::ContentChunk& TitleMetadata::GetContentChunkByID(u32 conten
     return *it;
 }
 
+bool TitleMetadata::HasContentID(u32 content_id) const {
+    const auto it =
+        std::find_if(tmd_chunks.begin(), tmd_chunks.end(),
+                     [content_id](const ContentChunk& chunk) { return chunk.id == content_id; });
+    return it != tmd_chunks.end();
+}
+
 void TitleMetadata::AddContentChunk(const ContentChunk& chunk) {
     tmd_chunks.push_back(chunk);
 }

src/core/ncch/title_metadata.h

@@ -127,6 +127,7 @@ public:
 
     ContentChunk& GetContentChunkByID(u32 content_id);
     const ContentChunk& GetContentChunkByID(u32 content_id) const;
+    bool HasContentID(u32 content_id) const;
 
     void SetTitleID(u64 title_id);
     void SetTitleType(u32 type);