src/TortoiseProc/gitlogcache.h

   1 // TortoiseGit - a Windows shell extension for easy version control
   2
   3 // Copyright (C) 2008-2011 - 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         HANDLE m_IndexFile;
 100         HANDLE m_IndexFileMap;
 101         SLogCacheIndexFile *m_pCacheIndex;
 102
 103
 104
 105         HANDLE m_DataFile;
 106         HANDLE m_DataFileMap;
 107         BYTE  *m_pCacheData;
 108
 109         void CloseDataHandles();
 110         void CloseIndexHandles();
 111         void Sort();
 112
 113         BOOL CheckHeader(SLogCacheIndexHeader *header)
 114         {
 115                 if(header->m_Magic != LOG_INDEX_MAGIC)
 116                         return FALSE;
 117
 118                 if(header->m_Version != LOG_INDEX_VERSION)
 119                         return FALSE;
 120
 121                 return TRUE;
 122         }
 123
 124         BOOL CheckHeader(SLogCacheRevFileHeader *header)
 125         {
 126                 if(header->m_Magic != LOG_DATA_FILE_MAGIC)
 127                         return FALSE;
 128
 129                 if(header->m_Version != LOG_INDEX_VERSION)
 130                         return FALSE;
 131
 132                 return TRUE;
 133         }
 134
 135         BOOL CheckHeader(SLogCacheRevItemHeader *header)
 136         {
 137                 if(header->m_Magic != LOG_DATA_ITEM_MAGIC)
 138                         return FALSE;
 139
 140                 if(header->m_Version != LOG_INDEX_VERSION)
 141                         return FALSE;
 142
 143                 return TRUE;
 144         }
 145
 146         BOOL CheckHeader(SLogCacheDataFileHeader *header)
 147         {
 148                 if(header->m_Magic != LOG_DATA_MAGIC)
 149                         return FALSE;
 150
 151                 if(header->m_Version != LOG_INDEX_VERSION)
 152                         return FALSE;
 153
 154                 return TRUE;
 155         }
 156
 157         int SaveOneItem(GitRev &Rev,ULONGLONG offset);
 158
 159         CString m_GitDir;
 160         int RebuildCacheFile();
 161
 162 public:
 163         CLogCache();
 164         ~CLogCache();
 165         int FetchCacheIndex(CString GitDir);
 166         int LoadOneItem(GitRev &Rev,ULONGLONG offset);
 167         ULONGLONG GetOffset(CGitHash &hash, SLogCacheIndexFile *pData =NULL);
 168
 169         CGitHashMap m_HashMap;
 170
 171         GitRev * GetCacheData(CGitHash &Rev);
 172         int AddCacheEntry(GitRev &Rev);
 173         int SaveCache();
 174
 175         int ClearAllParent();
 176
 177 };