Merge pull request #12 from lioncash/const

General: Make member functions const where applicable

include/kabufuda/Card.hpp

@@ -204,7 +204,7 @@ public:
    *
    * @return Gets the name of the given file.
    */
-  const char* getFilename(const FileHandle& fh);
+  const char* getFilename(const FileHandle& fh) const;
 
   /**
    * @brief deleteFile
@@ -269,7 +269,7 @@ public:
    *
    * @return The offset or -1 if an invalid handle is passed.
    */
-  int32_t tell(const FileHandle& fh);
+  int32_t tell(const FileHandle& fh) const;
 
   /**
    * @brief setPublic
@@ -425,7 +425,7 @@ public:
    * @param checksum The checksum of the system header.
    * @param inverse  The inverse checksum of the system header.
    */
-  void getChecksum(uint16_t& checksum, uint16_t& inverse);
+  void getChecksum(uint16_t& checksum, uint16_t& inverse) const;
 
   /**
    * @brief Retrieves the available storage and directory space.
@@ -433,7 +433,7 @@ public:
    * @param bytesNotUsed Number of free bytes out.
    * @param filesNotUsed Number of free files out.
    */
-  void getFreeBlocks(int32_t& bytesNotUsed, int32_t& filesNotUsed);
+  void getFreeBlocks(int32_t& bytesNotUsed, int32_t& filesNotUsed) const;
 
   /**
    * @brief Formats the memory card and assigns a new serial.

include/kabufuda/Directory.hpp

@@ -39,6 +39,6 @@ public:
   File* getFirstNonFreeFile(uint32_t start, const char* game, const char* maker);
   File* getFile(const char* game, const char* maker, const char* filename);
   File* getFile(uint32_t idx);
-  int32_t indexForFile(File* f);
+  int32_t indexForFile(const File* f) const;
 };
 } // namespace kabufuda

lib/kabufuda/Card.cpp

@@ -118,19 +118,23 @@ Card::Card(const char* game, const char* maker) {
 Card::~Card() { close(); }
 
 ECardResult Card::openFile(const char* filename, FileHandle& handleOut) {
-  ECardResult openRes = _pumpOpen();
-  if (openRes != ECardResult::READY)
+  const ECardResult openRes = _pumpOpen();
+  if (openRes != ECardResult::READY) {
     return openRes;
+  }
 
   handleOut = {};
-  File* f = m_dirs[m_currentDir].getFile(m_game, m_maker, filename);
-  if (!f || f->m_game[0] == 0xFF)
+  const File* const f = m_dirs[m_currentDir].getFile(m_game, m_maker, filename);
+  if (!f || f->m_game[0] == 0xFF) {
     return ECardResult::NOFILE;
-  int32_t idx = m_dirs[m_currentDir].indexForFile(f);
+  }
+
+  const int32_t idx = m_dirs[m_currentDir].indexForFile(f);
   if (idx != -1) {
     handleOut = FileHandle(idx);
     return ECardResult::READY;
   }
+
   return ECardResult::FATAL_ERROR;
 }
 
@@ -219,11 +223,13 @@ ECardResult Card::closeFile(FileHandle& fh) {
 }
 
 FileHandle Card::firstFile() {
-  File* f = m_dirs[m_currentDir].getFirstNonFreeFile(0, m_game, m_maker);
-  if (f)
-    return FileHandle(m_dirs[m_currentDir].indexForFile(f));
+  const File* const f = m_dirs[m_currentDir].getFirstNonFreeFile(0, m_game, m_maker);
 
-  return {};
+  if (f == nullptr) {
+    return {};
+  }
+
+  return FileHandle(m_dirs[m_currentDir].indexForFile(f));
 }
 
 FileHandle Card::nextFile(const FileHandle& cur) {
@@ -231,16 +237,22 @@ FileHandle Card::nextFile(const FileHandle& cur) {
     NullFileAccess();
     return {};
   }
-  File* next = m_dirs[m_currentDir].getFirstNonFreeFile(cur.idx + 1, m_game, m_maker);
-  if (!next)
+
+  const File* const next = m_dirs[m_currentDir].getFirstNonFreeFile(cur.idx + 1, m_game, m_maker);
+  if (next == nullptr) {
     return {};
+  }
+
   return FileHandle(m_dirs[m_currentDir].indexForFile(next));
 }
 
-const char* Card::getFilename(const FileHandle& fh) {
-  File* f = _fileFromHandle(fh);
-  if (!f)
+const char* Card::getFilename(const FileHandle& fh) const {
+  const File* const f = _fileFromHandle(fh);
+
+  if (f == nullptr) {
     return nullptr;
+  }
+
   return f->m_filename;
 }
 
@@ -445,7 +457,7 @@ void Card::seek(FileHandle& fh, int32_t pos, SeekOrigin whence) {
   }
 }
 
-int32_t Card::tell(const FileHandle& fh) { return fh.offset; }
+int32_t Card::tell(const FileHandle& fh) const { return fh.offset; }
 
 void Card::setPublic(const FileHandle& fh, bool pub) {
   File* file = _fileFromHandle(fh);
@@ -746,12 +758,12 @@ void Card::getSerial(uint64_t& serial) {
   m_ch._swapEndian();
 }
 
-void Card::getChecksum(uint16_t& checksum, uint16_t& inverse) {
+void Card::getChecksum(uint16_t& checksum, uint16_t& inverse) const {
   checksum = m_ch.m_checksum;
   inverse = m_ch.m_checksumInv;
 }
 
-void Card::getFreeBlocks(int32_t& bytesNotUsed, int32_t& filesNotUsed) {
+void Card::getFreeBlocks(int32_t& bytesNotUsed, int32_t& filesNotUsed) const {
   bytesNotUsed = m_bats[m_currentBat].numFreeBlocks() * 0x2000;
   filesNotUsed = m_dirs[m_currentDir].numFreeFiles();
 }

lib/kabufuda/Directory.cpp

@@ -125,7 +125,7 @@ File* Directory::getFile(uint32_t idx) {
   return &data.m_files[idx];
 }
 
-int32_t Directory::indexForFile(File* f) {
+int32_t Directory::indexForFile(const File* f) const {
   if (f == nullptr) {
     return -1;
   }