1 | /**********************************************************************
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2 | *
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3 | * MFFile.h
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4 | * Copyright (C) 2003 UNESCO
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5 | *
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6 | * A component of the Greenstone digital library software
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7 | * from the New Zealand Digital Library Project at the
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8 | * University of Waikato, New Zealand.
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9 | *
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10 | * This program is free software; you can redistribute it and/or modify
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11 | * it under the terms of the GNU General Public License as published by
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12 | * the Free Software Foundation; either version 2 of the License, or
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13 | * (at your option) any later version.
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14 | *
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15 | * This program is distributed in the hope that it will be useful,
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16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 | * GNU General Public License for more details.
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19 | *
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20 | * You should have received a copy of the GNU General Public License
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21 | * along with this program; if not, write to the Free Software
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22 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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23 | *
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24 | *********************************************************************/
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25 |
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26 | ////////////////////////////////////////////////////////////
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27 | // MFFILE.H: Class definition for blocked I/O on the master
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28 | // file
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29 | ////////////////////////////////////////////////////////////
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30 |
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31 | #ifndef _MFFILE_H_
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32 | #define _MFFILE_H_
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33 | #ifndef _MASTER_H_
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34 | #include "Master.h"
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35 | #endif
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36 | #ifndef _BLKFILE_H_
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37 | #include "BlkFile.h"
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38 | #endif
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39 | #include <string>
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40 |
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41 | enum MfLockType
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42 | {
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43 | MF_READ_LOCK,
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44 | MF_WRITE_LOCK
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45 | };
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46 |
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47 | struct SMfLockHeader
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48 | {
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49 | long lockProtect_; // Serialize access to the file lock members
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50 | long readLock_; // Shared (or read_only) file lock
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51 | long writeLock_; // Exclusive (or write-only) file lock
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52 |
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53 | SMfLockHeader() : lockProtect_(0), readLock_(0), writeLock_(0)
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54 | {}
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55 | };
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56 |
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57 | enum { USERMST=0, MSGMST=1 };
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58 | // binary hex
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59 | // ------ ---
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60 | // 0000 0
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61 | // 0001 1
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62 | // 0010 2
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63 | // 0011 3
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64 |
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65 | class MfAddress
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66 | {
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67 | private:
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68 | long m_mfb;
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69 | short m_mfp;
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70 | char m_status;
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71 | public:
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72 | MfAddress() { m_status = 0x00; }
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73 | MfAddress(long mfb, short mfp)
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74 | { ASSERT(mfb>0); ASSERT(mfp>=0); m_mfb = mfb; m_mfp = mfp; m_status = 0x03; }
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75 |
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76 | long getMfb() { ASSERT(m_status & 0x01); return m_mfb; }
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77 | short getMfp() { ASSERT(m_status & 0x02); return m_mfp; }
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78 |
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79 | void setMfb(long mfb) { ASSERT(mfb>0); m_mfb = mfb; m_status |= 0x01; }
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80 | void setMfp(short mfp) { ASSERT(mfp>=0); m_mfp = mfp; m_status |= 0x02; }
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81 | bool isValid() { return (m_status == 0x03); }
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82 | };
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83 |
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84 | /////////////////////////////////////////////////////////////////////////
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85 | // Master File header record aggregate structure
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86 | //
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87 | struct SMfHeader
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88 | {
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89 | ISIS_LONG ctlmfn_; // Always 0
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90 | ISIS_LONG nxtmfn_; // MFN to be assigned to next record created
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91 | ISIS_LONG nxtmfb_; // Last block number allocated (1st is 1)
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92 | ISIS_INT nxtmfp_; // Offset to next available position in last block (1:MFBLKSIZE)
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93 | ISIS_INT mftype_; // Type of master file (USERMST or MSGMST)
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94 | ISIS_LONG reccnt_;
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95 | ISIS_LONG mfcxx1_;
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96 | ISIS_LONG mfcxx2_;
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97 | ISIS_LONG mfcxx3_;
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98 | public:
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99 | SMfHeader(const char *dbname="");
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100 | ~SMfHeader() { }
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101 | };
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102 |
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103 | //--------------------------------------------------------------------------
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104 | // SMfHeader::SMfHeader(const char *dbname /* ="" */)
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105 | //
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106 | // Default constructor, initializes the Master file header to default values
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107 | //--------------------------------------------------------------------------
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108 | inline SMfHeader::SMfHeader(const char *dbname /* ="" */)
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109 | {
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110 | ctlmfn_ = 0;
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111 | nxtmfn_ = 1L;
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112 | nxtmfb_ = 1L;
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113 | nxtmfp_ = MFCTLLEN+1;
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114 | mftype_ = USERMST;
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115 | reccnt_ = mfcxx1_=mfcxx2_=mfcxx3_=0;
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116 | }
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117 |
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118 | //////////////////////
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119 | // Master file class
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120 | //
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121 | class MfFile : public BlkFile
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122 | {
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123 | friend class IsisDb;
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124 | friend class MfRecord;
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125 |
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126 | protected:
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127 | SMfHeader mfh_; // Header structure
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128 | long nextaddr_; // Address of next record
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129 | char buf_[MFBLKSIZE]; // Buffer to hold 1 Master File block
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130 | bool hdr_created_; // True if 1st block exists
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131 | int fileError_;
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132 | long lastWrittenBlock_;
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133 |
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134 | protected:
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135 | void WriteMfRecord(long mfb, int mfp, MfRecord &r);
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136 | void AppendNewBlock();
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137 |
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138 | public:
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139 | void setNextMfn(long mfn) // Set MFN to be assigned to next record created
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140 | { mfh_.nxtmfn_ = mfn; }
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141 |
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142 | protected:
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143 | void setNextMfb(long nxtmfb_) // Set last block number allocated (1st is 1)
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144 | { mfh_.nxtmfb_ = nxtmfb_; }
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145 | void setNextMfp(int nxtmfp_) // Set offset to next available position in last block
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146 | { mfh_.nxtmfp_ = nxtmfp_; }
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147 | int setm_mftype(int mftype_) // Set type of master file (USERMST or MSGMST)
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148 | { mfh_.mftype_ = mftype_; }
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149 | virtual void ReadBlk(void* d, long b) { BlkFile::ReadBlk(d, b); }
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150 | virtual void WriteBlk(void* d, long b) { BlkFile::WriteBlk(d, b); }
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151 | void ReadMfHdr(SMfHeader &h);
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152 | void ReadMfHdr();
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153 | void WriteMfHdr(SMfHeader &h);
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154 | void WriteMfHdr();
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155 | void SetLastWrittenBlock(long b) { lastWrittenBlock_ = b; }
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156 | public:
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157 | MfFile();
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158 | virtual ~MfFile();
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159 |
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160 | int OpenMf(const TCHAR* name, FileSystem::AccessMode mode = FileSystem::FILE_READWRITE);
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161 | int CreateMf(const TCHAR* name, int MSTtype = USERMST);
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162 | void CloseMf() { if (ReadyForWriting()) WriteMfHdr(); Close(); }
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163 |
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164 | // Accessors for the Master File Header
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165 | long GetNextMfn() // Get MFN to be assigned to next record created
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166 | { return mfh_.nxtmfn_; }
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167 | long GetNextMfb() // Get last block number allocated (1st is 1)
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168 | { return mfh_.nxtmfb_; }
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169 | int GetNextMfp() // Get offset to next available position in last block
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170 | { return mfh_.nxtmfp_; }
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171 | int GetMftype() // Get type of master file (USERMST or MSGMST)
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172 | { return mfh_.mftype_; }
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173 | SMfHeader& GetSMfHeader() { return mfh_; }
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174 |
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175 |
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176 | void CreateMfRecord(MfRecord &m, long &mfb, int &mfp);
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177 | void AddMfRecord(MfRecord &m, long &mfb, int &mfp);
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178 | void UpdateMfRecord(MfRecord &m, long &mfb, int &mfp);
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179 | bool ReadMfRecord(long mfb, int mfp, MfRecord &r);
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180 |
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181 | void ReadMfRecord(long addr, MfRecord &r);
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182 | void WriteMfRecord(long addr, MfRecord &r);
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183 | void RewindMf();
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184 | bool ReadMfNext(MfRecord &r);
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185 | void WriteMfNext(MfRecord &r);
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186 | void ReadLeader(long daddr, MfRecord& m)
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187 | {
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188 | m.ReadLeader(*this, daddr);
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189 | }
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190 |
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191 |
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192 | void LockMfHdr();
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193 | void UnlockMfHdr();
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194 | void LockMfr(long mfn);
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195 | void UnlockMfr(long mfn);
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196 |
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197 | public: // File lock functions
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198 | void InitFileLockHdr(SMfLockHeader &hdr);
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199 | FileError ResetFileLock();
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200 | FileError WriteFileLockHdr(const SMfLockHeader &hdr);
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201 | FileError ReadFileLockHdr(SMfLockHeader &hdr);
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202 | int LockFile(MfLockType l_type = MF_WRITE_LOCK);
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203 | int UnlockFile(MfLockType l_type = MF_WRITE_LOCK);
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204 |
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205 |
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206 | void PrintMfRecord(MfRecord &r);
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207 | void PrintMfHdr(SMfHeader &h);
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208 | void PrintMfHdr();
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209 | };
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210 |
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211 |
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212 | class CMfIterator
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213 | {
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214 | const MfFile& m_mf;
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215 | long cur;
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216 | public:
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217 | CMfIterator(const MfFile& mf) : m_mf(mf) { }
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218 |
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219 | bool More() const;
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220 | void Advance();
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221 |
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222 | MfRecord Current()
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223 | {
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224 | MfRecord mfr(NULL);
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225 |
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226 | return mfr;
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227 | }
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228 | };
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229 |
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230 |
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231 | //////////////////////////////
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232 |
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233 | inline void MfFile::LockMfHdr()
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234 | // Locks the master file header record
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235 | {
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236 | double_t dwPos = 0;
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237 | double_t dwCount = sizeof(SMfHeader);
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238 | //CFile::LockRange(dwPos, dwCount);
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239 | }
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240 |
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241 | //////////////////////////////
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242 |
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243 | inline void MfFile::UnlockMfHdr()
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244 | // Unlocks the master file header record
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245 | {
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246 | double_t dwPos = 0;
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247 | double_t dwCount = sizeof(SMfHeader);
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248 | //CFile::UnlockRange(dwPos, dwCount);
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249 | }
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250 |
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251 | //////////////////////////////
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252 |
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253 | inline void MfFile::ReadMfHdr()
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254 | // Reads the master file header record
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255 | {
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256 | ReadBlk(buf_, 1L);
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257 | TRACE(_T("\nsizeof(SMfHeader)=%d"), sizeof(SMfHeader));
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258 | ::MoveMemory(&mfh_, buf_, sizeof(SMfHeader));
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259 |
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260 | fix_endianness(mfh_.ctlmfn_);
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261 | fix_endianness(mfh_.nxtmfn_);
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262 | fix_endianness(mfh_.nxtmfb_);
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263 | fix_endianness(mfh_.nxtmfp_);
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264 | fix_endianness(mfh_.mftype_);
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265 | fix_endianness(mfh_.reccnt_);
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266 | fix_endianness(mfh_.mfcxx1_);
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267 | fix_endianness(mfh_.mfcxx2_);
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268 | fix_endianness(mfh_.mfcxx3_);
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269 | }
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270 |
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271 | //////////////////////////////
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272 |
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273 | inline void MfFile::WriteMfHdr()
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274 | // Updates the master file header record
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275 | {
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276 | if (hdr_created_)
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277 | ReadBlk(buf_, 1L);
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278 | TRACE(_T("\nsizeof(SMfHeader)=%d"), sizeof(SMfHeader));
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279 | ::MoveMemory(buf_, &mfh_, sizeof(SMfHeader));
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280 | WriteBlk(buf_, 1L);
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281 | }
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282 |
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283 |
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284 | //////////////////////////////
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285 |
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286 | inline void MfFile::ReadMfHdr(SMfHeader &h)
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287 | // Reads the master file header record
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288 | {
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289 | ReadBlk(buf_, 1L);
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290 | ::MoveMemory(&h, buf_, sizeof(SMfHeader));
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291 |
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292 | fix_endianness(h.ctlmfn_);
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293 | fix_endianness(h.nxtmfn_);
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294 | fix_endianness(h.nxtmfb_);
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295 | fix_endianness(h.nxtmfp_);
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296 | fix_endianness(h.mftype_);
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297 | fix_endianness(h.reccnt_);
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298 | fix_endianness(h.mfcxx1_);
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299 | fix_endianness(h.mfcxx2_);
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300 | fix_endianness(h.mfcxx3_);
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301 | }
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302 |
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303 | //////////////////////////////
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304 |
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305 | inline void MfFile::WriteMfHdr(SMfHeader &h)
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306 | // Updates the master file header record
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307 | {
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308 | if (hdr_created_)
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309 | ReadBlk(buf_, 1L);
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310 | ::MoveMemory(buf_, &h, sizeof(SMfHeader));
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311 | WriteBlk(buf_, 1L);
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312 | }
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313 |
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314 |
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315 | inline void MfFile::PrintMfHdr()
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316 | {
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317 | PrintMfHdr(mfh_);
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318 | }
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319 |
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320 | //////////////////////////////
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321 |
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322 | inline bool MfFile::ReadMfNext(MfRecord &r)
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323 | // Reads the next physically record
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324 | {
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325 | if (nextaddr_ >= CFileBase::FileSize(file_name))
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326 | return false;
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327 | ReadMfRecord(nextaddr_, r);
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328 | return true;
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329 | }
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330 |
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331 | //////////////////////////////
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332 |
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333 | inline void MfFile::WriteMfNext(MfRecord &r)
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334 | // Writes physically at next position
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335 | {
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336 | WriteMfRecord(nextaddr_, r);
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337 | }
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338 | #endif
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