...

1 files changed, 54 insertions, 0 deletions

diff --git a/src/common/io/MemoryStream.cpp b/src/common/io/MemoryStream.cpp
new file mode 100644
index 00000000..e3c9c605
--- /dev/null
+++ b/src/common/io/MemoryStream.cpp
@@ -0,0 +1,54 @@
+#include "cru/common/io/MemoryStream.hpp"
+
+namespace cru::io {
+bool MemoryStream::CanSeek() { return true; }
+
+Index MemoryStream::Tell() { return position_; }
+
+void MemoryStream::Seek(Index offset, SeekOrigin origin) {
+  switch (origin) {
+    case SeekOrigin::Current:
+      position_ += offset;
+      break;
+    case SeekOrigin::Begin:
+      position_ = offset;
+      break;
+    case SeekOrigin::End:
+      position_ = size_ + offset;
+      break;
+  }
+}
+
+bool MemoryStream::CanRead() { return true; }
+
+Index MemoryStream::Read(std::byte *buffer, Index offset, Index size) {
+  if (position_ + size > size_) {
+    size = size_ - position_;
+  }
+  if (size <= 0) {
+    return 0;
+  }
+  std::memcpy(buffer + offset, buffer_ + position_, size);
+  position_ += size;
+  return size;
+}
+
+bool MemoryStream::CanWrite() { return !read_only_; }
+
+Index MemoryStream::Write(const std::byte *buffer, Index offset, Index size) {
+  if (read_only_) {
+    return 0;
+  }
+  if (position_ + size > size_) {
+    size = size_ - position_;
+  }
+  if (size <= 0) {
+    return 0;
+  }
+  std::memcpy(buffer_ + position_, buffer + offset, size);
+  position_ += size;
+  return size;
+}
+
+void MemoryStream::Flush() {}
+}  // namespace cru::io