3 files changed, 7 insertions, 15 deletions
diff --git a/src/common/io/CFileStream.cpp b/src/common/io/CFileStream.cpp
index de195538..29d4819f 100644
--- a/src/common/io/CFileStream.cpp
+++ b/src/common/io/CFileStream.cpp
@@ -97,6 +97,7 @@ bool CFileStream::CanRead() {
 
 Index CFileStream::Read(std::byte* buffer, Index offset, Index size) {
   CheckClosed();
+  StreamOperationNotSupportedException::CheckRead(readable_);
   auto count = std::fread(buffer + offset, 1, size, file_);
   return count;
 }
@@ -108,6 +109,7 @@ bool CFileStream::CanWrite() {
 
 Index CFileStream::Write(const std::byte* buffer, Index offset, Index size) {
   CheckClosed();
+  StreamOperationNotSupportedException::CheckWrite(writable_);
   auto count = std::fwrite(buffer + offset, 1, size, file_);
   return count;
 }
@@ -125,8 +127,6 @@ void CFileStream::Close() {
 }
 
 void CFileStream::CheckClosed() {
-  if (file_ == nullptr) {
-    throw StreamAlreadyClosedException(u"File is closed.");
-  }
+  StreamAlreadyClosedException::Check(file_ == nullptr);
 }
 }  // namespace cru::io
diff --git a/src/common/io/FileNotExistException.cpp b/src/common/io/FileNotExistException.cpp
deleted file mode 100644
index a2e1fdb1..00000000
--- a/src/common/io/FileNotExistException.cpp
+++ /dev/null
@@ -1,12 +0,0 @@
-#include "cru/common/io/FileNotExistException.h"
-
-#include "cru/common/Exception.h"
-#include "cru/common/Format.h"
-
-#include <utility>
-
-namespace cru::io {
-  FileNotExistException::FileNotExistException(String path): Exception(), path_(std::move(path)) {
-    SetMessage(Format(u"File {} does not exist.", path_));
-  }
-}
diff --git a/src/common/io/Stream.cpp b/src/common/io/Stream.cpp
index 07677fa8..97669944 100644
--- a/src/common/io/Stream.cpp
+++ b/src/common/io/Stream.cpp
@@ -1,4 +1,5 @@
 #include "cru/common/io/Stream.h"
+#include "cru/common/Exception.h"
 #include "cru/common/Format.h"
 
 #include <utility>
@@ -22,6 +23,9 @@ void StreamOperationNotSupportedException::CheckWrite(bool writable) {
   if (!writable) throw StreamOperationNotSupportedException(u"write");
 }
 
+StreamAlreadyClosedException::StreamAlreadyClosedException()
+    : Exception(u"Stream is already closed.") {}
+
 void StreamAlreadyClosedException::Check(bool closed) {
   if (closed) throw StreamAlreadyClosedException();
 }