Loader: Updated read methods to be const

- Required "file" handle to be made local and explicitly opened/closed as needed

src/core/file_sys/archive_romfs.cpp

@@ -11,7 +11,7 @@
 
 namespace FileSys {
 
-Archive_RomFS::Archive_RomFS(Loader::AppLoader& app_loader) {
+Archive_RomFS::Archive_RomFS(const Loader::AppLoader& app_loader) {
     // Load the RomFS from the app
     if (Loader::ResultStatus::Success != app_loader.ReadRomFS(raw_data)) {
         WARN_LOG(FILESYS, "Unable to read RomFS!");

src/core/file_sys/archive_romfs.h

@@ -19,7 +19,7 @@ namespace FileSys {
 /// File system interface to the RomFS archive
 class Archive_RomFS : public Archive {
 public:
-    Archive_RomFS(Loader::AppLoader& app_loader);
+    Archive_RomFS(const Loader::AppLoader& app_loader);
     ~Archive_RomFS();
 
     /**

src/core/loader/loader.h

@@ -51,7 +51,7 @@ public:
      * @param buffer Reference to buffer to store data
      * @return ResultStatus result of function
      */
-    virtual ResultStatus ReadCode(std::vector<u8>& buffer) {
+    virtual ResultStatus ReadCode(std::vector<u8>& buffer) const {
         return ResultStatus::ErrorNotImplemented;
     }
 
@@ -60,7 +60,7 @@ public:
      * @param buffer Reference to buffer to store data
      * @return ResultStatus result of function
      */
-    virtual ResultStatus ReadIcon(std::vector<u8>& buffer) {
+    virtual ResultStatus ReadIcon(std::vector<u8>& buffer) const {
         return ResultStatus::ErrorNotImplemented;
     }
 
@@ -69,7 +69,7 @@ public:
      * @param buffer Reference to buffer to store data
      * @return ResultStatus result of function
      */
-    virtual ResultStatus ReadBanner(std::vector<u8>& buffer) {
+    virtual ResultStatus ReadBanner(std::vector<u8>& buffer) const {
         return ResultStatus::ErrorNotImplemented;
     }
 
@@ -78,7 +78,7 @@ public:
      * @param buffer Reference to buffer to store data
      * @return ResultStatus result of function
      */
-    virtual ResultStatus ReadLogo(std::vector<u8>& buffer) {
+    virtual ResultStatus ReadLogo(std::vector<u8>& buffer) const {
         return ResultStatus::ErrorNotImplemented;
     }
 
@@ -87,7 +87,7 @@ public:
      * @param buffer Reference to buffer to store data
      * @return ResultStatus result of function
      */
-    virtual ResultStatus ReadRomFS(std::vector<u8>& buffer) {
+    virtual ResultStatus ReadRomFS(std::vector<u8>& buffer) const {
         return ResultStatus::ErrorNotImplemented;
     }
 };

src/core/loader/ncch.cpp

@@ -113,15 +113,13 @@ AppLoader_NCCH::AppLoader_NCCH(const std::string& filename) {
 
 /// AppLoader_NCCH destructor
 AppLoader_NCCH::~AppLoader_NCCH() {
-    if (file.IsOpen())
-        file.Close();
 }
 
 /**
  * Loads .code section into memory for booting
  * @return ResultStatus result of function
  */
-ResultStatus AppLoader_NCCH::LoadExec() {
+ResultStatus AppLoader_NCCH::LoadExec() const {
     if (!is_loaded) 
         return ResultStatus::ErrorNotLoaded;
 
@@ -140,8 +138,10 @@ ResultStatus AppLoader_NCCH::LoadExec() {
  * @param buffer Vector to read data into
  * @return ResultStatus result of function
  */
-ResultStatus AppLoader_NCCH::LoadSectionExeFS(const char* name, std::vector<u8>& buffer) {
+ResultStatus AppLoader_NCCH::LoadSectionExeFS(const char* name, std::vector<u8>& buffer) const {
     // Iterate through the ExeFs archive until we find the .code file...
+    File::IOFile file(filename, "rb");
+    if (file.IsOpen()) {
         for (int i = 0; i < kMaxSections; i++) {
             // Load the specified section...
             if (strcmp((const char*)exefs_header.section[i].name, name) == 0) {
@@ -151,7 +151,7 @@ ResultStatus AppLoader_NCCH::LoadSectionExeFS(const char* name, std::vector<u8>&
                 INFO_LOG(LOADER, "    size:   0x%08X", exefs_header.section[i].size);
 
                 s64 section_offset = (exefs_header.section[i].offset + exefs_offset +
-                sizeof(ExeFs_Header) + ncch_offset);
+                    sizeof(ExeFs_Header)+ncch_offset);
                 file.Seek(section_offset, 0);
 
                 // Section is compressed...
@@ -169,13 +169,18 @@ ResultStatus AppLoader_NCCH::LoadSectionExeFS(const char* name, std::vector<u8>&
                         return ResultStatus::ErrorInvalidFormat;
                     }
                     // Section is uncompressed...
-            } else {
+                }
+                else {
                     buffer.resize(exefs_header.section[i].size);
                     file.ReadBytes(&buffer[0], exefs_header.section[i].size);
                 }
                 return ResultStatus::Success;
             }
         }
+    } else {
+        ERROR_LOG(LOADER, "Unable to read file %s!", filename.c_str());
+        return ResultStatus::Error;
+    }
     return ResultStatus::ErrorNotUsed;
 } 
 
@@ -191,8 +196,7 @@ ResultStatus AppLoader_NCCH::Load() {
     if (is_loaded)
         return ResultStatus::ErrorAlreadyLoaded;
 
-    file = File::IOFile(filename, "rb");
+    File::IOFile file(filename, "rb");
-
     if (file.IsOpen()) {
         file.ReadBytes(&ncch_header, sizeof(NCCH_Header));
 
@@ -235,6 +239,8 @@ ResultStatus AppLoader_NCCH::Load() {
         LoadExec(); // Load the executable into memory for booting
 
         return ResultStatus::Success;
+    } else {
+        ERROR_LOG(LOADER, "Unable to read file %s!", filename.c_str());
     }
     return ResultStatus::Error;
 }
@@ -244,7 +250,7 @@ ResultStatus AppLoader_NCCH::Load() {
  * @param buffer Reference to buffer to store data
  * @return ResultStatus result of function
  */
-ResultStatus AppLoader_NCCH::ReadCode(std::vector<u8>& buffer) {
+ResultStatus AppLoader_NCCH::ReadCode(std::vector<u8>& buffer) const {
     return LoadSectionExeFS(".code", buffer);
 }
 
@@ -253,7 +259,7 @@ ResultStatus AppLoader_NCCH::ReadCode(std::vector<u8>& buffer) {
  * @param buffer Reference to buffer to store data
  * @return ResultStatus result of function
  */
-ResultStatus AppLoader_NCCH::ReadIcon(std::vector<u8>& buffer) {
+ResultStatus AppLoader_NCCH::ReadIcon(std::vector<u8>& buffer) const {
     return LoadSectionExeFS("icon", buffer);
 }
 
@@ -262,7 +268,7 @@ ResultStatus AppLoader_NCCH::ReadIcon(std::vector<u8>& buffer) {
  * @param buffer Reference to buffer to store data
  * @return ResultStatus result of function
  */
-ResultStatus AppLoader_NCCH::ReadBanner(std::vector<u8>& buffer) {
+ResultStatus AppLoader_NCCH::ReadBanner(std::vector<u8>& buffer) const {
     return LoadSectionExeFS("banner", buffer);
 }
 
@@ -271,7 +277,7 @@ ResultStatus AppLoader_NCCH::ReadBanner(std::vector<u8>& buffer) {
  * @param buffer Reference to buffer to store data
  * @return ResultStatus result of function
  */
-ResultStatus AppLoader_NCCH::ReadLogo(std::vector<u8>& buffer) {
+ResultStatus AppLoader_NCCH::ReadLogo(std::vector<u8>& buffer) const {
     return LoadSectionExeFS("logo", buffer);
 }
 
@@ -280,7 +286,9 @@ ResultStatus AppLoader_NCCH::ReadLogo(std::vector<u8>& buffer) {
  * @param buffer Reference to buffer to store data
  * @return ResultStatus result of function
  */
-ResultStatus AppLoader_NCCH::ReadRomFS(std::vector<u8>& buffer) {
+ResultStatus AppLoader_NCCH::ReadRomFS(std::vector<u8>& buffer) const {
+    File::IOFile file(filename, "rb");
+    if (file.IsOpen()) {
         // Check if the NCCH has a RomFS...
         if (ncch_header.romfs_offset != 0 && ncch_header.romfs_size != 0) {
             u32 romfs_offset = ncch_offset + (ncch_header.romfs_offset * kBlockSize) + 0x1000;
@@ -298,6 +306,10 @@ ResultStatus AppLoader_NCCH::ReadRomFS(std::vector<u8>& buffer) {
         }
         NOTICE_LOG(LOADER, "RomFS unused");
         return ResultStatus::ErrorNotUsed;
+    } else {
+        ERROR_LOG(LOADER, "Unable to read file %s!", filename.c_str());
+    }
+    return ResultStatus::Error;
 }
 
 } // namespace Loader

src/core/loader/ncch.h

@@ -161,35 +161,35 @@ public:
      * @param buffer Reference to buffer to store data
      * @return ResultStatus result of function
      */
-    ResultStatus ReadCode(std::vector<u8>& buffer);
+    ResultStatus ReadCode(std::vector<u8>& buffer) const;
 
     /**
      * Get the icon (typically icon section) of the application
      * @param buffer Reference to buffer to store data
      * @return ResultStatus result of function
      */
-    ResultStatus ReadIcon(std::vector<u8>& buffer);
+    ResultStatus ReadIcon(std::vector<u8>& buffer) const;
 
     /**
      * Get the banner (typically banner section) of the application
      * @param buffer Reference to buffer to store data
      * @return ResultStatus result of function
      */
-    ResultStatus ReadBanner(std::vector<u8>& buffer);
+    ResultStatus ReadBanner(std::vector<u8>& buffer) const;
 
     /**
      * Get the logo (typically logo section) of the application
      * @param buffer Reference to buffer to store data
      * @return ResultStatus result of function
      */
-    ResultStatus ReadLogo(std::vector<u8>& buffer);
+    ResultStatus ReadLogo(std::vector<u8>& buffer) const;
 
     /**
      * Get the RomFS of the application
      * @param buffer Reference to buffer to store data
      * @return ResultStatus result of function
      */
-    ResultStatus ReadRomFS(std::vector<u8>& buffer);
+    ResultStatus ReadRomFS(std::vector<u8>& buffer) const;
 
 private:
 
@@ -199,15 +199,14 @@ private:
      * @param buffer Vector to read data into
      * @return ResultStatus result of function
      */
-    ResultStatus LoadSectionExeFS(const char* name, std::vector<u8>& buffer);
+    ResultStatus LoadSectionExeFS(const char* name, std::vector<u8>& buffer) const;
 
     /**
      * Loads .code section into memory for booting
      * @return ResultStatus result of function
      */
-    ResultStatus LoadExec();
+    ResultStatus LoadExec() const;
 
-    File::IOFile    file;
     std::string     filename;
 
     bool            is_loaded;