Develop ProxyStream.

1 files changed, 46 insertions, 0 deletions

diff --git a/src/common/io/ProxyStream.cpp b/src/common/io/ProxyStream.cpp
index 9fd6be76..df8e7dcc 100644
--- a/src/common/io/ProxyStream.cpp
+++ b/src/common/io/ProxyStream.cpp
@@ -7,6 +7,52 @@ ProxyStream::ProxyStream(ProxyStreamHandlers handlers)
 
 ProxyStream::~ProxyStream() { DoClose(); }
 
+bool ProxyStream::CanSeek() {
+  CheckClosed();
+  return static_cast<bool>(handlers_.seek);
+}
+
+Index ProxyStream::Seek(Index offset, SeekOrigin origin) {
+  CheckClosed();
+  StreamOperationNotSupportedException::CheckSeek(CanSeek());
+  return handlers_.seek(offset, origin);
+}
+
+bool ProxyStream::CanRead() {
+  CheckClosed();
+  return static_cast<bool>(handlers_.read);
+}
+
+Index ProxyStream::Read(std::byte* buffer, Index offset, Index size) {
+  CheckClosed();
+  StreamOperationNotSupportedException::CheckRead(CanRead());
+  return handlers_.read(buffer, offset, size);
+}
+
+bool ProxyStream::CanWrite() {
+  CheckClosed();
+  return static_cast<bool>(handlers_.write);
+}
+
+Index ProxyStream::Write(const std::byte* buffer, Index offset, Index size) {
+  CheckClosed();
+  StreamOperationNotSupportedException::CheckWrite(CanWrite());
+  return handlers_.write(buffer, offset, size);
+}
+
+void ProxyStream::Flush() {
+  CheckClosed();
+  if (handlers_.flush) {
+    handlers_.flush();
+  }
+}
+
+void ProxyStream::Close() { DoClose(); }
+
+void ProxyStream::CheckClosed() {
+  StreamAlreadyClosedException::Check(closed_);
+}
+
 void ProxyStream::DoClose() {
   if (!closed_) {
     if (handlers_.close) {