1 files changed, 89 insertions, 2 deletions
diff --git a/source/fud_c_file.cpp b/source/fud_c_file.cpp
index 24186bf..3d15431 100644
--- a/source/fud_c_file.cpp
+++ b/source/fud_c_file.cpp
@@ -38,10 +38,13 @@ CBinaryFile::~CBinaryFile() {
     close();
 }
 
-FileResult CBinaryFile::open()
+FileStatus CBinaryFile::open()
 {
+    if (!m_filename.valid()) {
+        return FileStatus::InvalidName;
+    }
     m_file = fopen(m_filename.c_str(), m_mode.c_str());
-    return m_file != nullptr ? FileResult::Success : FileResult::Error;
+    return m_file != nullptr ? FileStatus::Success : FileStatus::Error;
 }
 
 void CBinaryFile::close()
@@ -62,4 +65,88 @@ FILE* CBinaryFile::file()
     return m_file;
 }
 
+bool CBinaryFile::isOpen() const
+{
+    return m_file != nullptr;
+}
+
+Result<size_t, FileStatus> CBinaryFile::size() const
+{
+    using RetType = Result<size_t, FileStatus>;
+    if (!isOpen()) {
+        return RetType::error(FileStatus::InvalidState);
+    }
+
+    auto seekStatus = fseek(m_file, 0, SEEK_END);
+    if (seekStatus != 0) {
+        return RetType::error(FileStatus::Error);
+    }
+
+    auto fileSizeResult = ftell(m_file);
+    if (fileSizeResult < 0) {
+        return RetType::error(FileStatus::Error);
+    }
+
+    auto fileSize = static_cast<size_t>(fileSizeResult);
+
+    auto resetStatus = reset();
+    if (resetStatus != FileStatus::Success) {
+        return RetType::error(resetStatus);
+    }
+
+    return RetType::okay(fileSize);
+}
+
+FileStatus CBinaryFile::read(void* destination, size_t destinationSize, size_t length)
+{
+    return read(destination, destinationSize, length, 0);
+}
+
+FileStatus CBinaryFile::read(void* destination, size_t destinationSize, size_t length, size_t offset)
+{
+    if (length == 0) {
+        return FileStatus::Success;
+    }
+
+    if (destination == nullptr) {
+        return FileStatus::NullPointer;
+    }
+
+    if (offset > LONG_MAX || SIZE_MAX - offset < length || destinationSize < length) {
+        return FileStatus::InvalidArgument;
+    }
+
+    auto fileSizeResult = size();
+    if (fileSizeResult.isError()) {
+        return fileSizeResult.getError();
+    }
+
+    auto fileSize = fileSizeResult.getOkay();
+    if (offset + length > fileSize) {
+        return FileStatus::InvalidArgument;
+    }
+
+    auto seekResult = fseek(m_file, static_cast<long>(offset), SEEK_SET);
+    if (seekResult != 0) {
+        return FileStatus::Error;
+    }
+
+    auto* destPtr = static_cast<char*>(destination);
+    auto readResult = fread(destPtr, length, 1, m_file);
+    if (readResult != 1) {
+        static_cast<void>(reset());
+        return FileStatus::Error;
+    }
+
+    return FileStatus::Success;
+}
+
+FileStatus CBinaryFile::reset() const {
+    if (!isOpen()) {
+        return FileStatus::InvalidState;
+    }
+    auto result = fseek(m_file, 0, SEEK_SET);
+    return result == 0 ? FileStatus::Success : FileStatus::Error;
+}
+
 } // namespace fud