Fix OV cache header not being removed from blob for memory mapped cac…

…he file

src/core/dev_api/openvino/runtime/aligned_buffer.hpp

@@ -30,14 +30,17 @@ class OPENVINO_API AlignedBuffer {
     size_t size() const {
         return m_byte_size;
     }
+    void updateOffset(size_t offset) {
+        m_offset = offset;
+    }
     void* get_ptr(size_t offset) const {
         return m_aligned_buffer + offset;
     }
     void* get_ptr() {
-        return m_aligned_buffer;
+        return m_aligned_buffer + m_offset;
     }
     const void* get_ptr() const {
-        return m_aligned_buffer;
+        return m_aligned_buffer + m_offset;
     }
     template <typename T>
     T* get_ptr() {
@@ -61,6 +64,7 @@ class OPENVINO_API AlignedBuffer {
     char* m_allocated_buffer;
     char* m_aligned_buffer;
     size_t m_byte_size;
+    size_t m_offset = 0;
 };
 
 template <>

src/core/dev_api/openvino/runtime/shared_buffer.hpp

@@ -16,6 +16,7 @@ class SharedBuffer : public ov::AlignedBuffer {
         m_allocated_buffer = data;
         m_aligned_buffer = data;
         m_byte_size = size;
+        m_offset = 0;
     }
 
     virtual ~SharedBuffer() {
@@ -81,6 +82,26 @@ class OwningSharedStreamBuffer : public SharedStreamBuffer {
         return m_shared_obj;
     }
 
+    std::streamsize xsgetn(char* s, std::streamsize count) override {
+        auto streamSize = SharedStreamBuffer::xsgetn(s, count);
+        m_shared_obj->updateOffset(m_offset);
+        return streamSize;
+    }
+
+    int_type uflow() override {
+        auto val = SharedStreamBuffer::uflow();
+        m_shared_obj->updateOffset(m_offset);
+        return val;
+    }
+
+    pos_type seekoff(off_type off,
+        std::ios_base::seekdir dir,
+        std::ios_base::openmode which = std::ios_base::in) override {
+        auto pos = SharedStreamBuffer::seekoff(off, dir, which);
+        m_shared_obj->updateOffset(m_offset);
+        return pos;
+    }
+
 protected:
     std::shared_ptr<ov::AlignedBuffer> m_shared_obj;
 };