From e750083a537bd4a948ac3c1a46f951b74c1929b7 Mon Sep 17 00:00:00 2001
From: rachytski <siarhei.rachytski@gmail.com>
Date: Sun, 19 Dec 2010 22:22:54 +0200
Subject: [PATCH] introduced memory_mapped_file class.

---
 base/base.pro               |  6 +++--
 base/memory_mapped_file.cpp | 47 +++++++++++++++++++++++++++++++++++++
 base/memory_mapped_file.hpp | 33 ++++++++++++++++++++++++++
 yg/glyph_cache_impl.cpp     | 14 +++--------
 yg/glyph_cache_impl.hpp     | 10 ++++----
 5 files changed, 93 insertions(+), 17 deletions(-)
 create mode 100644 base/memory_mapped_file.cpp
 create mode 100644 base/memory_mapped_file.hpp

diff --git a/base/base.pro b/base/base.pro
index 7720f58b57..9b26ce8a41 100644
--- a/base/base.pro
+++ b/base/base.pro
@@ -15,7 +15,8 @@ SOURCES += base.cpp \
     string_utils.cpp \
     profiler.cpp \
     commands_queue.cpp \
-    shared_buffer_manager.cpp
+    shared_buffer_manager.cpp \
+    memory_mapped_file.cpp
 
 HEADERS += SRC_FIRST.hpp \
     assert.hpp \
@@ -53,4 +54,5 @@ HEADERS += SRC_FIRST.hpp \
     ptr_utils.hpp \
     stats.hpp \
     monitor.hpp \
-    shared_buffer_manager.hpp
+    shared_buffer_manager.hpp \
+    memory_mapped_file.hpp
diff --git a/base/memory_mapped_file.cpp b/base/memory_mapped_file.cpp
new file mode 100644
index 0000000000..f62f83b1a9
--- /dev/null
+++ b/base/memory_mapped_file.cpp
@@ -0,0 +1,47 @@
+#include "../base/SRC_FIRST.hpp"
+#include "memory_mapped_file.hpp"
+
+MemoryMappedFile::MemoryMappedFile(char const * fileName, bool isReadOnly)
+  : m_isReadOnly(isReadOnly)
+{
+#ifdef OMIM_OS_WINDOWS_NATIVE
+  m_fp = fopen(name, isReadOnly ? "r" : "w");
+  fseek(m_fp, SEEK_END);
+  m_size = ftell(m_fp);
+  fseek(m_fp, SEEK_SET);
+
+  m_data = malloc(m_size);
+  fread(m_data, 1, m_size, m_fp);
+#else
+  struct stat s;
+  stat(fileName, &s);
+  m_size = s.st_size;
+  m_fd = open(fileName, isReadOnly ? O_RDONLY : O_RDWR);
+  m_data = mmap(0, m_size, isReadOnly ? PROT_READ : (PROT_READ | PROT_WRITE), MAP_SHARED, m_fd, 0);
+#endif
+}
+
+MemoryMappedFile::~MemoryMappedFile()
+{
+#ifdef OMIM_OS_WINDOWS_NATIVE
+  if (!m_isReadOnly)
+  {
+    fwrite(m_data, 1, m_size, m_fp);
+  }
+  fclose(m_fp);
+  free(m_data);
+#else
+  munmap(m_data, m_size);
+  close(m_fd);
+#endif
+}
+
+void * MemoryMappedFile::data()
+{
+  return m_data;
+}
+
+size_t MemoryMappedFile::size() const
+{
+  return m_size;
+}
diff --git a/base/memory_mapped_file.hpp b/base/memory_mapped_file.hpp
new file mode 100644
index 0000000000..49f4cf2828
--- /dev/null
+++ b/base/memory_mapped_file.hpp
@@ -0,0 +1,33 @@
+#pragma once
+
+#include "../std/target_os.hpp"
+
+#ifdef OMIM_OS_WINDOWS_NATIVE
+  #include "../std/windows.hpp"
+#else
+  #include <sys/mman.h>
+  #include <sys/errno.h>
+  #include <sys/stat.h>
+  #include <sys/fcntl.h>
+#endif
+
+class MemoryMappedFile
+{
+private:
+
+  bool m_isReadOnly;
+
+#ifdef OMIM_OS_WINDOWS_NATIVE
+  FILE * m_fp;
+#else
+  int    m_fd;
+  void * m_data;
+  size_t m_size;
+#endif
+
+public:
+  MemoryMappedFile(char const * fileName, bool isReadOnly);
+  ~MemoryMappedFile();
+  void * data();
+  size_t size() const;
+};
diff --git a/yg/glyph_cache_impl.cpp b/yg/glyph_cache_impl.cpp
index 20c9e7519a..6b02ea5051 100644
--- a/yg/glyph_cache_impl.cpp
+++ b/yg/glyph_cache_impl.cpp
@@ -7,24 +7,16 @@
 #include <../cache/ftccback.h>
 #include <../cache/ftccache.h>
 
+
 namespace yg
 {
-  Font::Font(char const * name) : m_name(name)
+  Font::Font(char const * name) : m_name(name), m_fontData(name, true)
   {
-    FILE * fp = fopen(name, "rb");
-    fseek(fp, 0, SEEK_END);
-    int size = ftell(fp);
-    fseek(fp, 0, SEEK_SET);
-
-    m_fontData.resize(size);
-    fread(&m_fontData[0], 1, size, fp);
-
-    fclose(fp);
   }
 
   FT_Error Font::CreateFaceID(FT_Library library, FT_Face *face)
   {
-    return FT_New_Memory_Face(library, &m_fontData[0], m_fontData.size(), 0, face);
+    return FT_New_Memory_Face(library, (unsigned char*)m_fontData.data(), m_fontData.size(), 0, face);
   }
 
   GlyphCacheImpl::GlyphCacheImpl(size_t maxSize)
diff --git a/yg/glyph_cache_impl.hpp b/yg/glyph_cache_impl.hpp
index 3f056b2651..6d66acc832 100644
--- a/yg/glyph_cache_impl.hpp
+++ b/yg/glyph_cache_impl.hpp
@@ -3,15 +3,17 @@
 #include "ft2_debug.hpp"
 #include "../std/string.hpp"
 #include "../std/vector.hpp"
-
-
+#include "../std/shared_ptr.hpp"
+#include "../base/memory_mapped_file.hpp"
 
 namespace yg
 {
   struct Font
   {
     string m_name;
-    vector<unsigned char> m_fontData;
+
+    MemoryMappedFile m_fontData;
+
     /// information about symbol ranges
     /// ...
     /// constructor
@@ -32,7 +34,7 @@ namespace yg
 
     FTC_CMapCache m_charMapCache;
 
-    typedef vector<Font> TFonts;
+    typedef vector<shared_ptr<Font> > TFonts;
     TFonts m_fonts;
 
     static FT_Error RequestFace(FTC_FaceID faceID, FT_Library library, FT_Pointer requestData, FT_Face * face);