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472 lines
10 KiB
472 lines
10 KiB
/*
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* db.c - Twin database module.
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*/
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/* Headers
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**********/
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#include "project.h"
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#pragma hdrstop
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#include "stub.h"
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/* Constants
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************/
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/* database header magic id string */
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#define MAGIC_HEADER "DDSH\x02\x05\x01\x14"
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/* length of MAGIC_HEADER (no null terminator) */
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#define MAGIC_HEADER_LEN (8)
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/* Types
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********/
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typedef struct _dbheader
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{
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BYTE rgbyteMagic[MAGIC_HEADER_LEN];
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DWORD dwcbHeaderLen;
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DWORD dwMajorVer;
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DWORD dwMinorVer;
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}
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DBHEADER;
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DECLARE_STANDARD_TYPES(DBHEADER);
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/***************************** Private Functions *****************************/
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/* Module Prototypes
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********************/
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PRIVATE_CODE TWINRESULT WriteDBHeader(HCACHEDFILE, PDBHEADER);
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PRIVATE_CODE TWINRESULT ReadDBHeader(HCACHEDFILE, PDBHEADER);
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PRIVATE_CODE TWINRESULT CheckDBHeader(PCDBHEADER);
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PRIVATE_CODE TWINRESULT WriteTwinInfo(HCACHEDFILE, HBRFCASE);
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PRIVATE_CODE TWINRESULT ReadTwinInfo(HCACHEDFILE, HBRFCASE, PCDBVERSION);
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#ifdef VSTF
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PRIVATE_CODE BOOL IsValidPCDBHEADER(PCDBHEADER);
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#endif
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/*
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** WriteDBHeader()
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**
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**
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**
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** Arguments:
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**
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** Returns: TWINRESULT
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**
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** Side Effects: none
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*/
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PRIVATE_CODE TWINRESULT WriteDBHeader(HCACHEDFILE hcf, PDBHEADER pdbh)
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{
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TWINRESULT tr;
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ASSERT(IS_VALID_HANDLE(hcf, CACHEDFILE));
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ASSERT(IS_VALID_STRUCT_PTR(pdbh, CDBHEADER));
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if (WriteToCachedFile(hcf, (PCVOID)pdbh, sizeof(*pdbh), NULL))
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tr = TR_SUCCESS;
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else
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tr = TR_BRIEFCASE_WRITE_FAILED;
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return(tr);
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}
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/*
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** ReadDBHeader()
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**
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**
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**
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** Arguments:
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**
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** Returns: TWINRESULT
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**
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** Side Effects: none
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*/
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PRIVATE_CODE TWINRESULT ReadDBHeader(HCACHEDFILE hcf, PDBHEADER pdbh)
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{
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TWINRESULT tr;
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DWORD dwcbRead;
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ASSERT(IS_VALID_HANDLE(hcf, CACHEDFILE));
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ASSERT(IS_VALID_WRITE_PTR(pdbh, DBHEADER));
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if (ReadFromCachedFile(hcf, pdbh, sizeof(*pdbh), &dwcbRead) &&
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dwcbRead == sizeof(*pdbh))
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tr = CheckDBHeader(pdbh);
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else
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tr = TR_CORRUPT_BRIEFCASE;
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return(tr);
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}
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/*
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** CheckDBHeader()
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**
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**
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**
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** Arguments:
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**
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** Returns: TWINRESULT
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**
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** Side Effects: none
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*/
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PRIVATE_CODE TWINRESULT CheckDBHeader(PCDBHEADER pcdbh)
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{
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TWINRESULT tr = TR_CORRUPT_BRIEFCASE;
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ASSERT(IS_VALID_READ_PTR(pcdbh, CDBHEADER));
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if (MyMemComp(pcdbh->rgbyteMagic, MAGIC_HEADER, sizeof(pcdbh->rgbyteMagic)) == CR_EQUAL)
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{
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/* Treat older databases as corrupt. Support M8 databases. */
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if (pcdbh->dwMajorVer == HEADER_MAJOR_VER &&
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(pcdbh->dwMinorVer == HEADER_MINOR_VER || pcdbh->dwMinorVer == HEADER_M8_MINOR_VER))
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{
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if (pcdbh->dwcbHeaderLen == sizeof(*pcdbh))
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tr = TR_SUCCESS;
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}
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else if (pcdbh->dwMajorVer > HEADER_MAJOR_VER ||
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(pcdbh->dwMajorVer == HEADER_MAJOR_VER &&
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pcdbh->dwMinorVer > HEADER_MINOR_VER))
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{
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tr = TR_NEWER_BRIEFCASE;
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WARNING_OUT((TEXT("CheckDBHeader(): Newer database version %lu.%lu."),
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pcdbh->dwMajorVer,
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pcdbh->dwMinorVer));
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}
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else
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{
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tr = TR_CORRUPT_BRIEFCASE;
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WARNING_OUT((TEXT("CheckDBHeader(): Treating old database version %lu.%lu as corrupt. Current database version is %lu.%lu."),
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pcdbh->dwMajorVer,
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pcdbh->dwMinorVer,
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(DWORD)HEADER_MAJOR_VER,
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(DWORD)HEADER_MINOR_VER));
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}
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}
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return(tr);
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}
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/*
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** WriteTwinInfo()
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**
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**
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**
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** Arguments:
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**
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** Returns: TWINRESULT
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**
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** Side Effects: none
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*/
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PRIVATE_CODE TWINRESULT WriteTwinInfo(HCACHEDFILE hcf, HBRFCASE hbr)
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{
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TWINRESULT tr = TR_BRIEFCASE_WRITE_FAILED;
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ASSERT(IS_VALID_HANDLE(hcf, CACHEDFILE));
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ASSERT(IS_VALID_HANDLE(hbr, BRFCASE));
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tr = WritePathList(hcf, GetBriefcasePathList(hbr));
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if (tr == TR_SUCCESS)
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{
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tr = WriteBriefcaseInfo(hcf, hbr);
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if (tr == TR_SUCCESS)
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{
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tr = WriteStringTable(hcf, GetBriefcaseNameStringTable(hbr));
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if (tr == TR_SUCCESS)
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{
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tr = WriteTwinFamilies(hcf, GetBriefcaseTwinFamilyPtrArray(hbr));
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if (tr == TR_SUCCESS)
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tr = WriteFolderPairList(hcf, GetBriefcaseFolderPairPtrArray(hbr));
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}
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}
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}
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return(tr);
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}
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/*
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** ReadTwinInfo()
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**
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**
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**
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** Arguments:
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**
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** Returns: TWINRESULT
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**
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** Side Effects: none
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*/
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PRIVATE_CODE TWINRESULT ReadTwinInfo(HCACHEDFILE hcf, HBRFCASE hbr,
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PCDBVERSION pcdbver)
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{
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TWINRESULT tr;
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HHANDLETRANS hhtPathTrans;
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ASSERT(IS_VALID_HANDLE(hcf, CACHEDFILE));
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ASSERT(IS_VALID_READ_PTR(pcdbver, DBVERSION));
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ASSERT(IS_VALID_HANDLE(hbr, BRFCASE));
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tr = ReadPathList(hcf, GetBriefcasePathList(hbr), &hhtPathTrans);
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if (tr == TR_SUCCESS)
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{
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tr = ReadBriefcaseInfo(hcf, hbr, hhtPathTrans);
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if (tr == TR_SUCCESS)
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{
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HHANDLETRANS hhtNameTrans;
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tr = ReadStringTable(hcf, GetBriefcaseNameStringTable(hbr), &hhtNameTrans);
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if (tr == TR_SUCCESS)
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{
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tr = ReadTwinFamilies(hcf, hbr, pcdbver, hhtPathTrans, hhtNameTrans);
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if (tr == TR_SUCCESS)
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tr = ReadFolderPairList(hcf, hbr, hhtPathTrans, hhtNameTrans);
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DestroyHandleTranslator(hhtNameTrans);
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}
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}
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DestroyHandleTranslator(hhtPathTrans);
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}
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return(tr);
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}
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#ifdef VSTF
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/*
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** IsValidPCDBHEADER()
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**
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**
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**
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** Arguments:
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**
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** Returns:
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**
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** Side Effects: none
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*/
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PRIVATE_CODE BOOL IsValidPCDBHEADER(PCDBHEADER pcdbh)
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{
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BOOL bResult;
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if (IS_VALID_READ_PTR(pcdbh, CDBHEADER) &&
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EVAL(MyMemComp(pcdbh->rgbyteMagic, MAGIC_HEADER, sizeof(pcbdh->rgbyteMagic)) == CR_EQUAL) &&
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EVAL(pcdbh->dwcbHeaderLen == sizeof(*pcdbh)) &&
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EVAL(pcdbh->dwMajorVer == HEADER_MAJOR_VER) &&
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EVAL(pcdbh->dwMinorVer == HEADER_MINOR_VER || pcdbh->dwMinorVer == HEADER_M8_MINOR_VER))
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bResult = TRUE;
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else
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bResult = FALSE;
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return(bResult);
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}
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#endif
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/****************************** Public Functions *****************************/
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/*
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** WriteTwinDatabase()
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**
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**
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**
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** Arguments:
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**
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** Returns:
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**
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** Side Effects: none
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*/
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PUBLIC_CODE TWINRESULT WriteTwinDatabase(HCACHEDFILE hcf, HBRFCASE hbr)
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{
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TWINRESULT tr;
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ASSERT(IS_VALID_HANDLE(hcf, CACHEDFILE));
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ASSERT(IS_VALID_HANDLE(hbr, BRFCASE));
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if (! SeekInCachedFile(hcf, 0, FILE_BEGIN))
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{
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DBHEADER dbh;
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/* Set up database header. */
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CopyMemory(dbh.rgbyteMagic, MAGIC_HEADER, sizeof(dbh.rgbyteMagic));
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dbh.dwcbHeaderLen = sizeof(dbh);
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dbh.dwMajorVer = HEADER_MAJOR_VER;
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dbh.dwMinorVer = HEADER_MINOR_VER;
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tr = WriteDBHeader(hcf, &dbh);
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if (tr == TR_SUCCESS)
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{
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TRACE_OUT((TEXT("WriteTwinDatabase(): Wrote database header version %lu.%lu."),
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dbh.dwMajorVer,
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dbh.dwMinorVer));
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tr = WriteTwinInfo(hcf, hbr);
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if (tr == TR_SUCCESS && ! SetEndOfCachedFile(hcf))
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tr = TR_BRIEFCASE_WRITE_FAILED;
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}
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}
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else
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tr = TR_BRIEFCASE_WRITE_FAILED;
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return(tr);
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}
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/*
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** ReadTwinDatabase()
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**
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**
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**
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** Arguments:
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**
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** Returns:
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**
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** Side Effects: none
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*/
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PUBLIC_CODE TWINRESULT ReadTwinDatabase(HBRFCASE hbr, HCACHEDFILE hcf)
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{
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TWINRESULT tr;
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ASSERT(IS_VALID_HANDLE(hbr, BRFCASE));
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ASSERT(IS_VALID_HANDLE(hcf, CACHEDFILE));
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if (! SeekInCachedFile(hcf, 0, FILE_BEGIN))
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{
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DBHEADER dbh;
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tr = ReadDBHeader(hcf, &dbh);
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if (tr == TR_SUCCESS)
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{
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TRACE_OUT((TEXT("ReadTwinDatabase(): Read database header version %lu.%lu."),
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dbh.dwMajorVer,
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dbh.dwMinorVer));
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tr = ReadTwinInfo(hcf, hbr, (PCDBVERSION)&dbh.dwMajorVer);
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if (tr == TR_SUCCESS)
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ASSERT(GetCachedFilePointerPosition(hcf) == GetCachedFileSize(hcf));
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}
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}
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else
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tr = TR_BRIEFCASE_READ_FAILED;
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return(tr);
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}
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/*
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** WriteDBSegmentHeader()
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**
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**
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**
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** Arguments:
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**
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** Returns: TWINRESULT
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**
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** Side Effects: none
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*/
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PUBLIC_CODE TWINRESULT WriteDBSegmentHeader(HCACHEDFILE hcf,
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LONG lcbDBSegmentHeaderOffset,
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PCVOID pcvSegmentHeader,
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UINT ucbSegmentHeaderLen)
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{
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TWINRESULT tr;
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DWORD dwcbStartOffset;
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ASSERT(IS_VALID_HANDLE(hcf, CACHEDFILE));
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ASSERT(lcbDBSegmentHeaderOffset >= 0);
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ASSERT(ucbSegmentHeaderLen > 0);
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ASSERT(IS_VALID_READ_BUFFER_PTR(pcvSegmentHeader, BYTE, ucbSegmentHeaderLen));
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dwcbStartOffset = GetCachedFilePointerPosition(hcf);
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if (dwcbStartOffset != INVALID_SEEK_POSITION &&
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SeekInCachedFile(hcf, lcbDBSegmentHeaderOffset, SEEK_SET) != INVALID_SEEK_POSITION &&
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WriteToCachedFile(hcf, pcvSegmentHeader, ucbSegmentHeaderLen, NULL) &&
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SeekInCachedFile(hcf, dwcbStartOffset, SEEK_SET) != INVALID_SEEK_POSITION)
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tr = TR_SUCCESS;
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else
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tr = TR_BRIEFCASE_WRITE_FAILED;
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return(tr);
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}
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/*
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** TranslateFCRESULTToTWINRESULT()
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**
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**
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**
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** Arguments:
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**
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** Returns:
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**
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** Side Effects: none
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*/
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PUBLIC_CODE TWINRESULT TranslateFCRESULTToTWINRESULT(FCRESULT fcr)
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{
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TWINRESULT tr;
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switch (fcr)
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{
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case FCR_SUCCESS:
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tr = TR_SUCCESS;
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break;
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case FCR_OUT_OF_MEMORY:
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tr = TR_OUT_OF_MEMORY;
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break;
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case FCR_OPEN_FAILED:
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tr = TR_BRIEFCASE_OPEN_FAILED;
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break;
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case FCR_CREATE_FAILED:
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tr = TR_BRIEFCASE_OPEN_FAILED;
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break;
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case FCR_WRITE_FAILED:
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tr = TR_BRIEFCASE_WRITE_FAILED;
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break;
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default:
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ASSERT(fcr == FCR_FILE_LOCKED);
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tr = TR_BRIEFCASE_LOCKED;
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break;
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}
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return(tr);
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}
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