intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 72 insertions, 0 deletions

diff --git a/library/cpp/deprecated/mapped_file/mapped_file.h b/library/cpp/deprecated/mapped_file/mapped_file.h
new file mode 100644
index 0000000000..45859ed65a
--- /dev/null
+++ b/library/cpp/deprecated/mapped_file/mapped_file.h
@@ -0,0 +1,72 @@
+#pragma once
+
+#include <util/generic/flags.h>
+#include <util/generic/ptr.h>
+#include <util/generic/string.h>
+#include <util/generic/utility.h>
+#include <util/generic/yexception.h>
+#include <util/system/align.h>
+#include <util/system/file.h>
+#include <util/system/filemap.h>
+#include <util/system/yassert.h>
+
+#include <cstdio>
+#include <new>
+
+/// Deprecated (by pg@), use TFileMap or TMemoryMap instead
+class TMappedFile {
+private:
+    TFileMap* Map_;
+
+private:
+    TMappedFile(TFileMap* map, const char* dbgName);
+
+public:
+    TMappedFile() {
+        Map_ = nullptr;
+    }
+
+    ~TMappedFile() {
+        term();
+    }
+
+    explicit TMappedFile(const TString& name) {
+        Map_ = nullptr;
+        init(name, TFileMap::oRdOnly);
+    }
+
+    TMappedFile(const TFile& file, TFileMap::EOpenMode om = TFileMap::oRdOnly, const char* dbgName = "unknown");
+
+    void init(const TString& name);
+
+    void init(const TString& name, TFileMap::EOpenMode om);
+
+    void init(const TString& name, size_t length, TFileMap::EOpenMode om);
+
+    void init(const TFile&, TFileMap::EOpenMode om = TFileMap::oRdOnly, const char* dbgName = "unknown");
+
+    void flush();
+
+    void term() {
+        if (Map_) {
+            Map_->Unmap();
+            delete Map_;
+            Map_ = nullptr;
+        }
+    }
+
+    size_t getSize() const {
+        return (Map_ ? Map_->MappedSize() : 0);
+    }
+
+    void* getData(size_t pos = 0) const {
+        Y_ASSERT(!Map_ || (pos <= getSize()));
+        return (Map_ ? (void*)((unsigned char*)Map_->Ptr() + pos) : nullptr);
+    }
+
+    void precharge(size_t pos = 0, size_t size = (size_t)-1) const;
+
+    void swap(TMappedFile& file) noexcept {
+        DoSwap(Map_, file.Map_);
+    }
+};