src/TortoiseProc/gitlogcache.h

   1 // TortoiseGit - a Windows shell extension for easy version control
   2
   3 // Copyright (C) 2008-2013 - TortoiseGit
   4
   5 // This program is free software; you can redistribute it and/or
   6 // modify it under the terms of the GNU General Public License
   7 // as published by the Free Software Foundation; either version 2
   8 // of the License, or (at your option) any later version.
   9
  10 // This program is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14
  15 // You should have received a copy of the GNU General Public License
  16 // along with this program; if not, write to the Free Software Foundation,
  17 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 //
  19 #pragma once
  20
  21 #include "Git.h"
  22 #include "TGitPath.h"
  23 #include "GitRev.h"
  24 #include "GitHash.h"
  25
  26 #define LOG_INDEX_MAGIC         0x88AA5566
  27 #define LOG_DATA_MAGIC          0x99BB0FFF
  28 #define LOG_DATA_ITEM_MAGIC 0x0FCC9ACC
  29 #define LOG_DATA_FILE_MAGIC 0x19EE9DFF
  30 #define LOG_INDEX_VERSION   0xF
  31
  32 #pragma pack (1)
  33 struct SLogCacheIndexHeader
  34 {
  35         DWORD m_Magic;
  36         DWORD m_Version;
  37         DWORD m_ItemCount;
  38 };
  39
  40 struct SLogCacheIndexItem
  41 {
  42         CGitHash  m_Hash;
  43         ULONGLONG m_Offset;
  44 };
  45
  46 struct SLogCacheIndexFile
  47 {
  48         struct SLogCacheIndexHeader m_Header;
  49         struct SLogCacheIndexItem       m_Item[1]; //dynmatic size
  50 };
  51
  52 struct SLogCacheRevFileHeader
  53 {
  54         DWORD m_Magic;
  55         DWORD m_Version;
  56         DWORD m_Action;
  57         DWORD m_Stage;
  58         DWORD m_ParentNo;
  59         DWORD m_Add;
  60         DWORD m_Del;
  61         DWORD m_FileNameSize;
  62         DWORD m_OldFileNameSize;
  63         TCHAR m_FileName[1];
  64 };
  65 # pragma pack ()
  66
  67 struct SLogCacheRevItemHeader
  68 {
  69         DWORD m_Magic;
  70         DWORD m_Version;
  71         DWORD m_FileCount;
  72 };
  73
  74 struct SLogCacheDataFileHeader
  75 {
  76         DWORD m_Magic;
  77         DWORD m_Version;
  78 };
  79
  80 class CGitHashMap:public std::map<CGitHash,GitRev>
  81 {
  82 public:
  83         bool IsExist(CGitHash &hash)
  84         {
  85                 return find(hash) != end();
  86         }
  87 };
  88
  89 #define INDEX_FILE_NAME _T("tortoisegit.index")
  90 #define DATA_FILE_NAME _T("tortoisegit.data")
  91 #define LOCK_FILE_NAME _T("tortoisegit.lock")
  92
  93
  94 class CLogCache
  95 {
  96 public:
  97
  98 protected:
  99         BOOL m_bEnabled;
 100
 101         HANDLE m_IndexFile;
 102         HANDLE m_IndexFileMap;
 103         SLogCacheIndexFile *m_pCacheIndex;
 104
 105
 106
 107         HANDLE m_DataFile;
 108         HANDLE m_DataFileMap;
 109         BYTE  *m_pCacheData;
 110         DWORD m_DataFileLength;
 111
 112         void CloseDataHandles();
 113         void CloseIndexHandles();
 114         void Sort();
 115
 116         BOOL CheckHeader(SLogCacheIndexHeader *header)
 117         {
 118                 if (header->m_Magic != LOG_INDEX_MAGIC)
 119                         return FALSE;
 120
 121                 if (header->m_Version != LOG_INDEX_VERSION)
 122                         return FALSE;
 123
 124                 return TRUE;
 125         }
 126
 127         BOOL CheckHeader(SLogCacheRevFileHeader *header)
 128         {
 129                 if (header->m_Magic != LOG_DATA_FILE_MAGIC)
 130                         return FALSE;
 131
 132                 if (header->m_Version != LOG_INDEX_VERSION)
 133                         return FALSE;
 134
 135                 return TRUE;
 136         }
 137
 138         BOOL CheckHeader(SLogCacheRevItemHeader *header)
 139         {
 140                 if (header->m_Magic != LOG_DATA_ITEM_MAGIC)
 141                         return FALSE;
 142
 143                 if (header->m_Version != LOG_INDEX_VERSION)
 144                         return FALSE;
 145
 146                 return TRUE;
 147         }
 148
 149         BOOL CheckHeader(SLogCacheDataFileHeader *header)
 150         {
 151                 if (header->m_Magic != LOG_DATA_MAGIC)
 152                         return FALSE;
 153
 154                 if (header->m_Version != LOG_INDEX_VERSION)
 155                         return FALSE;
 156
 157                 return TRUE;
 158         }
 159
 160         int SaveOneItem(GitRev &Rev, LONG offset);
 161
 162         CString m_GitDir;
 163         int RebuildCacheFile();
 164
 165 public:
 166         CLogCache();
 167         ~CLogCache();
 168         int FetchCacheIndex(CString GitDir);
 169         int LoadOneItem(GitRev &Rev,ULONGLONG offset);
 170         ULONGLONG GetOffset(CGitHash &hash, SLogCacheIndexFile *pData =NULL);
 171
 172         CGitHashMap m_HashMap;
 173
 174         GitRev * GetCacheData(CGitHash &hash);
 175         int AddCacheEntry(GitRev &Rev);
 176         int SaveCache();
 177
 178         int ClearAllParent();
 179         void ClearAllLanes();
 180 };