YQL-16239 Move purecalc to public

1 files changed, 42 insertions, 0 deletions

diff --git a/library/cpp/deprecated/datafile/datafile.cpp b/library/cpp/deprecated/datafile/datafile.cpp
new file mode 100644
index 00000000000..ff93f11c6b7
--- /dev/null
+++ b/library/cpp/deprecated/datafile/datafile.cpp
@@ -0,0 +1,42 @@
+#include "datafile.h"
+
+void TDataFileBase::DoLoad(const char* fname, int loadMode) {
+    Destroy();
+    TFile f(fname, RdOnly);
+    DoLoad(f, loadMode, nullptr, 0);
+}
+
+void TDataFileBase::DoLoad(TFile& f, int loadMode, void* hdrPtr, size_t hdrSize) {
+    if (hdrPtr) {
+        if (loadMode & DLM_EXACT_SIZE && f.GetLength() != (i64)Length)
+            throw yexception() << f.GetName() << " size does not match its header value";
+    } else {
+        Length = f.GetLength();
+        hdrSize = 0;
+    }
+    if ((loadMode & DLM_LD_TYPE_MASK) == DLM_READ) {
+        MemData = TVector<char>(Length);
+        memcpy(MemData.begin(), hdrPtr, hdrSize);
+        f.Load(MemData.begin() + hdrSize, Length - hdrSize);
+        Start = MemData.begin();
+    } else {
+        FileData.init(f);
+        if (FileData.getSize() < Length)
+            throw yexception() << f.GetName() << " is smaller than what its header value says";
+        if ((loadMode & DLM_LD_TYPE_MASK) == DLM_MMAP_PRC)
+            FileData.precharge();
+        Start = (const char*)FileData.getData();
+    }
+}
+
+void TDataFileBase::Destroy() {
+    TVector<char>().swap(MemData);
+    FileData.term();
+    Start = nullptr;
+    Length = 0;
+}
+
+void TDataFileBase::Precharge() const {
+    if (Length && Start == (char*)FileData.getData())
+        FileData.precharge();
+}