diff options
Diffstat (limited to 'storage/connect/filamgz.cpp')
| -rw-r--r-- | storage/connect/filamgz.cpp | 1428 |
1 files changed, 1428 insertions, 0 deletions
diff --git a/storage/connect/filamgz.cpp b/storage/connect/filamgz.cpp new file mode 100644 index 00000000..5b965f63 --- /dev/null +++ b/storage/connect/filamgz.cpp @@ -0,0 +1,1428 @@ +/************ File AM GZ C++ Program Source Code File (.CPP) ***********/ +/* PROGRAM NAME: FILAMGZ */ +/* ------------- */ +/* Version 1.5 */ +/* */ +/* COPYRIGHT: */ +/* ---------- */ +/* (C) Copyright to the author Olivier BERTRAND 2005-2016 */ +/* */ +/* WHAT THIS PROGRAM DOES: */ +/* ----------------------- */ +/* This program are the ZLIB compressed files classes. */ +/* */ +/***********************************************************************/ + +/***********************************************************************/ +/* Include relevant MariaDB header file. */ +/***********************************************************************/ +#include "my_global.h" +#if defined(_WIN32) +#include <io.h> +#include <fcntl.h> +#if defined(__BORLANDC__) +#define __MFC_COMPAT__ // To define min/max as macro +#endif +//#include <windows.h> +#else // !_WIN32 +#if defined(UNIX) +#include <errno.h> +#else // !UNIX +#include <io.h> +#endif +#include <fcntl.h> +#endif // !_WIN32 + +#include <m_string.h> + +/***********************************************************************/ +/* Include application header files: */ +/* global.h is header containing all global declarations. */ +/* plgdbsem.h is header containing the DB application declarations. */ +/* tabdos.h is header containing the TABDOS class declarations. */ +/***********************************************************************/ +#include "global.h" +#include "plgdbsem.h" +//#include "catalog.h" +//#include "reldef.h" +//#include "xobject.h" +//#include "kindex.h" +#include "filamtxt.h" +#include "tabdos.h" +#if defined(UNIX) +#include "osutil.h" +#endif + +/***********************************************************************/ +/* This define prepares ZLIB function declarations. */ +/***********************************************************************/ +//#define ZLIB_DLL + +#include "filamgz.h" + +/***********************************************************************/ +/* DB static variables. */ +/***********************************************************************/ +extern int num_read, num_there, num_eq[]; // Statistics + +/* ------------------------------------------------------------------- */ + +/***********************************************************************/ +/* Implementation of the GZFAM class. */ +/***********************************************************************/ +GZFAM::GZFAM(PGZFAM txfp) : TXTFAM(txfp) + { + Zfile = txfp->Zfile; + Zpos = txfp->Zpos; + } // end of GZFAM copy constructor + +/***********************************************************************/ +/* Zerror: Error function for gz calls. */ +/* gzerror returns the error message for the last error which occurred*/ +/* on the given compressed file. errnum is set to zlib error number. */ +/* If an error occurred in the file system and not in the compression */ +/* library, errnum is set to Z_ERRNO and the application may consult */ +/* errno to get the exact error code. */ +/***********************************************************************/ +int GZFAM::Zerror(PGLOBAL g) + { + int errnum; + + snprintf(g->Message, sizeof(g->Message), "%s", gzerror(Zfile, &errnum)); + + if (errnum == Z_ERRNO) +#if defined(_WIN32) + snprintf(g->Message, sizeof(g->Message), MSG(READ_ERROR), To_File, strerror(NULL)); +#else // !_WIN32 + snprintf(g->Message, sizeof(g->Message), MSG(READ_ERROR), To_File, strerror(errno)); +#endif // !_WIN32 + + return (errnum == Z_STREAM_END) ? RC_EF : RC_FX; + } // end of Zerror + +/***********************************************************************/ +/* Reset: reset position values at the beginning of file. */ +/***********************************************************************/ +void GZFAM::Reset(void) + { + TXTFAM::Reset(); +//gzrewind(Zfile); // Useful ????? + Zpos = 0; + } // end of Reset + +/***********************************************************************/ +/* GZ GetFileLength: returns an estimate of what would be the */ +/* uncompressed file size in number of bytes. */ +/***********************************************************************/ +int GZFAM::GetFileLength(PGLOBAL g) + { + int len = TXTFAM::GetFileLength(g); + + if (len > 0) + // Estimate size reduction to a max of 6 + len *= 6; + + return len; + } // end of GetFileLength + +/***********************************************************************/ +/* GZ Access Method opening routine. */ +/***********************************************************************/ +bool GZFAM::OpenTableFile(PGLOBAL g) + { + const char *opmode; + char filename[_MAX_PATH]; + MODE mode = Tdbp->GetMode(); + + switch (mode) { + case MODE_READ: + opmode = "rb"; + break; + case MODE_UPDATE: + /*****************************************************************/ + /* Updating GZ files not implemented yet. */ + /*****************************************************************/ + snprintf(g->Message, sizeof(g->Message), MSG(UPD_ZIP_NOT_IMP)); + return true; + case MODE_DELETE: + if (!Tdbp->GetNext()) { + // Store the number of deleted lines + DelRows = Cardinality(g); + + // This will erase the entire file + opmode = "wb"; +// Block = 0; // For ZBKFAM +// Last = Nrec; // For ZBKFAM + Tdbp->ResetSize(); + } else { + snprintf(g->Message, sizeof(g->Message), MSG(NO_PART_DEL), "GZ"); + return true; + } // endif filter + + break; + case MODE_INSERT: + opmode = "a+b"; + break; + default: + snprintf(g->Message, sizeof(g->Message), MSG(BAD_OPEN_MODE), mode); + return true; + } // endswitch Mode + + /*********************************************************************/ + /* Open according to logical input/output mode required. */ + /* Use specific zlib functions. */ + /* Treat files as binary. */ + /*********************************************************************/ + Zfile = gzopen(PlugSetPath(filename, To_File, Tdbp->GetPath()), opmode); + + if (Zfile == NULL) { + snprintf(g->Message, sizeof(g->Message), MSG(GZOPEN_ERROR) ": %s", + opmode, (int)errno, filename, strerror(errno)); + return (mode == MODE_READ && errno == ENOENT) + ? PushWarning(g, Tdbp) : true; + } // endif Zfile + + /*********************************************************************/ + /* Something to be done here. >>>>>>>> NOT DONE <<<<<<<< */ + /*********************************************************************/ +//To_Fb = dbuserp->Openlist; // Keep track of File block + + /*********************************************************************/ + /* Allocate the line buffer. */ + /*********************************************************************/ + return AllocateBuffer(g); + } // end of OpenTableFile + +/***********************************************************************/ +/* Allocate the line buffer. For mode Delete a bigger buffer has to */ +/* be allocated because is it also used to move lines into the file. */ +/***********************************************************************/ +bool GZFAM::AllocateBuffer(PGLOBAL g) + { + MODE mode = Tdbp->GetMode(); + + Buflen = Lrecl + 2; // Lrecl does not include CRLF +//Buflen *= ((Mode == MODE_DELETE) ? DOS_BUFF_LEN : 1); NIY + + if (trace(1)) + htrc("SubAllocating a buffer of %d bytes\n", Buflen); + + To_Buf = (char*)PlugSubAlloc(g, NULL, Buflen); + + if (mode == MODE_INSERT) { + /*******************************************************************/ + /* For Insert buffer must be prepared. */ + /*******************************************************************/ + memset(To_Buf, ' ', Buflen); + To_Buf[Buflen - 2] = '\n'; + To_Buf[Buflen - 1] = '\0'; + } // endif Insert + + return false; + } // end of AllocateBuffer + +/***********************************************************************/ +/* GetRowID: return the RowID of last read record. */ +/***********************************************************************/ +int GZFAM::GetRowID(void) + { + return Rows; + } // end of GetRowID + +/***********************************************************************/ +/* GetPos: return the position of last read record. */ +/***********************************************************************/ +int GZFAM::GetPos(void) + { + return (int)Zpos; + } // end of GetPos + +/***********************************************************************/ +/* GetNextPos: return the position of next record. */ +/***********************************************************************/ +int GZFAM::GetNextPos(void) + { + return gztell(Zfile); + } // end of GetNextPos + +/***********************************************************************/ +/* SetPos: Replace the table at the specified position. */ +/***********************************************************************/ +bool GZFAM::SetPos(PGLOBAL g, int pos __attribute__((unused))) + { + snprintf(g->Message, sizeof(g->Message), MSG(NO_SETPOS_YET), "GZ"); + return true; +#if 0 + Fpos = pos; + + if (fseek(Stream, Fpos, SEEK_SET)) { + snprintf(g->Message, sizeof(g->Message), MSG(FSETPOS_ERROR), Fpos); + return true; + } // endif + + Placed = true; + return false; +#endif // 0 + } // end of SetPos + +/***********************************************************************/ +/* Record file position in case of UPDATE or DELETE. */ +/***********************************************************************/ +bool GZFAM::RecordPos(PGLOBAL) + { + Zpos = gztell(Zfile); + return false; + } // end of RecordPos + +/***********************************************************************/ +/* Skip one record in file. */ +/***********************************************************************/ +int GZFAM::SkipRecord(PGLOBAL g, bool header) + { + // Skip this record + if (gzeof(Zfile)) + return RC_EF; + else if (gzgets(Zfile, To_Buf, Buflen) == Z_NULL) + return Zerror(g); + + if (header) + RecordPos(g); + + return RC_OK; + } // end of SkipRecord + +/***********************************************************************/ +/* ReadBuffer: Read one line from a compressed text file. */ +/***********************************************************************/ +int GZFAM::ReadBuffer(PGLOBAL g) + { + char *p; + int rc; + + if (!Zfile) + return RC_EF; + + if (!Placed) { + /*******************************************************************/ + /* Record file position in case of UPDATE or DELETE. */ + /*******************************************************************/ + next: + if (RecordPos(g)) + return RC_FX; + + CurBlk = Rows++; // Update RowID + + /*******************************************************************/ + /* Check whether optimization on ROWID */ + /* can be done, as well as for join as for local filtering. */ + /*******************************************************************/ + switch (Tdbp->TestBlock(g)) { + case RC_EF: + return RC_EF; + case RC_NF: + // Skip this record + if ((rc = SkipRecord(g, FALSE)) != RC_OK) + return rc; + + goto next; + } // endswitch rc + + } else + Placed = false; + + if (gzeof(Zfile)) { + rc = RC_EF; + } else if (gzgets(Zfile, To_Buf, Buflen) != Z_NULL) { + p = To_Buf + strlen(To_Buf) - 1; + + if (*p == '\n') + *p = '\0'; // Eliminate ending new-line character + + if (*(--p) == '\r') + *p = '\0'; // Eliminate eventuel carriage return + + strcpy(Tdbp->GetLine(), To_Buf); + IsRead = true; + rc = RC_OK; + num_read++; + } else + rc = Zerror(g); + + if (trace(2)) + htrc(" Read: '%s' rc=%d\n", To_Buf, rc); + + return rc; + } // end of ReadBuffer + +/***********************************************************************/ +/* WriteDB: Data Base write routine for ZDOS access method. */ +/* Update is not possible without using a temporary file (NIY). */ +/***********************************************************************/ +int GZFAM::WriteBuffer(PGLOBAL g) + { + /*********************************************************************/ + /* Prepare the write buffer. */ + /*********************************************************************/ + strcat(strcpy(To_Buf, Tdbp->GetLine()), CrLf); + + /*********************************************************************/ + /* Now start the writing process. */ + /*********************************************************************/ + if (gzputs(Zfile, To_Buf) < 0) + return Zerror(g); + + return RC_OK; + } // end of WriteBuffer + +/***********************************************************************/ +/* Data Base delete line routine for ZDOS access method. (NIY) */ +/***********************************************************************/ +int GZFAM::DeleteRecords(PGLOBAL g, int) + { + snprintf(g->Message, sizeof(g->Message), MSG(NO_ZIP_DELETE)); + return RC_FX; + } // end of DeleteRecords + +/***********************************************************************/ +/* Data Base close routine for DOS access method. */ +/***********************************************************************/ +void GZFAM::CloseTableFile(PGLOBAL, bool) + { + int rc = gzclose(Zfile); + + if (trace(1)) + htrc("GZ CloseDB: closing %s rc=%d\n", To_File, rc); + + Zfile = NULL; // So we can know whether table is open +//To_Fb->Count = 0; // Avoid double closing by PlugCloseAll + } // end of CloseTableFile + +/***********************************************************************/ +/* Rewind routine for GZ access method. */ +/***********************************************************************/ +void GZFAM::Rewind(void) + { + gzrewind(Zfile); + } // end of Rewind + +/* ------------------------------------------------------------------- */ + +/***********************************************************************/ +/* Constructors. */ +/***********************************************************************/ +ZBKFAM::ZBKFAM(PDOSDEF tdp) : GZFAM(tdp) + { + Blocked = true; + Block = tdp->GetBlock(); + Last = tdp->GetLast(); + Nrec = tdp->GetElemt(); + CurLine = NULL; + NxtLine = NULL; + Closing = false; + BlkPos = tdp->GetTo_Pos(); + } // end of ZBKFAM standard constructor + +ZBKFAM::ZBKFAM(PZBKFAM txfp) : GZFAM(txfp) + { + CurLine = txfp->CurLine; + NxtLine = txfp->NxtLine; + Closing = txfp->Closing; + } // end of ZBKFAM copy constructor + +/***********************************************************************/ +/* Use BlockTest to reduce the table estimated size. */ +/***********************************************************************/ +int ZBKFAM::MaxBlkSize(PGLOBAL g, int) + { + int rc = RC_OK, savcur = CurBlk; + int size; + + // Roughly estimate the table size as the sum of blocks + // that can contain good rows + for (size = 0, CurBlk = 0; CurBlk < Block; CurBlk++) + if ((rc = Tdbp->TestBlock(g)) == RC_OK) + size += (CurBlk == Block - 1) ? Last : Nrec; + else if (rc == RC_EF) + break; + + CurBlk = savcur; + return size; + } // end of MaxBlkSize + +/***********************************************************************/ +/* ZBK Cardinality: returns table cardinality in number of rows. */ +/* This function can be called with a null argument to test the */ +/* availability of Cardinality implementation (1 yes, 0 no). */ +/***********************************************************************/ +int ZBKFAM::Cardinality(PGLOBAL g) + { + return (g) ? (int)((Block - 1) * Nrec + Last) : 1; + } // end of Cardinality + +/***********************************************************************/ +/* Allocate the line buffer. For mode Delete a bigger buffer has to */ +/* be allocated because is it also used to move lines into the file. */ +/***********************************************************************/ +bool ZBKFAM::AllocateBuffer(PGLOBAL g) + { + Buflen = Nrec * (Lrecl + 2); + CurLine = To_Buf = (char*)PlugSubAlloc(g, NULL, Buflen); + + if (Tdbp->GetMode() == MODE_INSERT) { + // Set values so Block and Last can be recalculated + if (Last == Nrec) { + CurBlk = Block; + Rbuf = Nrec; // To be used by WriteDB + } else { + // The last block must be completed + CurBlk = Block - 1; + Rbuf = Nrec - Last; // To be used by WriteDB + } // endif Last + + } // endif Insert + + return false; + } // end of AllocateBuffer + +/***********************************************************************/ +/* GetRowID: return the RowID of last read record. */ +/***********************************************************************/ +int ZBKFAM::GetRowID(void) + { + return CurNum + Nrec * CurBlk + 1; + } // end of GetRowID + +/***********************************************************************/ +/* GetPos: return the position of last read record. */ +/***********************************************************************/ +int ZBKFAM::GetPos(void) + { + return CurNum + Nrec * CurBlk; // Computed file index + } // end of GetPos + +/***********************************************************************/ +/* Record file position in case of UPDATE or DELETE. */ +/* Not used yet for fixed tables. */ +/***********************************************************************/ +bool ZBKFAM::RecordPos(PGLOBAL /*g*/) + { +//strcpy(g->Message, "RecordPos not implemented for gz blocked tables"); +//return true; + return RC_OK; + } // end of RecordPos + +/***********************************************************************/ +/* Skip one record in file. */ +/***********************************************************************/ +int ZBKFAM::SkipRecord(PGLOBAL /*g*/, bool) + { +//strcpy(g->Message, "SkipRecord not implemented for gz blocked tables"); +//return RC_FX; + return RC_OK; + } // end of SkipRecord + +/***********************************************************************/ +/* ReadBuffer: Read one line from a compressed text file. */ +/***********************************************************************/ +int ZBKFAM::ReadBuffer(PGLOBAL g) + { + int n, skip, rc = RC_OK; + + /*********************************************************************/ + /* Sequential reading when Placed is not true. */ + /*********************************************************************/ + if (++CurNum < Rbuf) { + CurLine = NxtLine; + + // Get the position of the next line in the buffer + while (*NxtLine++ != '\n') ; + + // Set caller line buffer + n = (int)(NxtLine - CurLine - Ending); + memcpy(Tdbp->GetLine(), CurLine, n); + Tdbp->GetLine()[n] = '\0'; + return RC_OK; + } else if (Rbuf < Nrec && CurBlk != -1) + return RC_EF; + + /*********************************************************************/ + /* New block. */ + /*********************************************************************/ + CurNum = 0; + skip = 0; + + next: + if (++CurBlk >= Block) + return RC_EF; + + /*********************************************************************/ + /* Before using the new block, check whether block optimization */ + /* can be done, as well as for join as for local filtering. */ + /*********************************************************************/ + switch (Tdbp->TestBlock(g)) { + case RC_EF: + return RC_EF; + case RC_NF: + skip++; + goto next; + } // endswitch rc + + if (skip) + // Skip blocks rejected by block optimization + for (int i = CurBlk - skip; i < CurBlk; i++) { + BlkLen = BlkPos[i + 1] - BlkPos[i]; + + if (gzseek(Zfile, (z_off_t)BlkLen, SEEK_CUR) < 0) + return Zerror(g); + + } // endfor i + + BlkLen = BlkPos[CurBlk + 1] - BlkPos[CurBlk]; + + if (!(n = gzread(Zfile, To_Buf, BlkLen))) { + rc = RC_EF; + } else if (n > 0) { + // Get the position of the current line + CurLine = To_Buf; + + // Now get the position of the next line + for (NxtLine = CurLine; *NxtLine++ != '\n';) ; + + // Set caller line buffer + n = (int)(NxtLine - CurLine - Ending); + memcpy(Tdbp->GetLine(), CurLine, n); + Tdbp->GetLine()[n] = '\0'; + Rbuf = (CurBlk == Block - 1) ? Last : Nrec; + IsRead = true; + rc = RC_OK; + num_read++; + } else + rc = Zerror(g); + + return rc; + } // end of ReadBuffer + +/***********************************************************************/ +/* WriteDB: Data Base write routine for ZDOS access method. */ +/* Update is not possible without using a temporary file (NIY). */ +/***********************************************************************/ +int ZBKFAM::WriteBuffer(PGLOBAL g) + { + /*********************************************************************/ + /* Prepare the write buffer. */ + /*********************************************************************/ + if (!Closing) + strcat(strcpy(CurLine, Tdbp->GetLine()), CrLf); + + /*********************************************************************/ + /* In Insert mode, blocs are added sequentialy to the file end. */ + /* Note: Update mode is not handled for gz files. */ + /*********************************************************************/ + if (++CurNum == Rbuf) { + /*******************************************************************/ + /* New block, start the writing process. */ + /*******************************************************************/ + BlkLen = CurLine + strlen(CurLine) - To_Buf; + + if (gzwrite(Zfile, To_Buf, BlkLen) != BlkLen || + gzflush(Zfile, Z_FULL_FLUSH)) { + Closing = true; + return Zerror(g); + } // endif gzwrite + + Rbuf = Nrec; + CurBlk++; + CurNum = 0; + CurLine = To_Buf; + } else + CurLine += strlen(CurLine); + + return RC_OK; + } // end of WriteBuffer + +/***********************************************************************/ +/* Data Base delete line routine for ZBK access method. */ +/* Implemented only for total deletion of the table, which is done */ +/* by opening the file in mode "wb". */ +/***********************************************************************/ +int ZBKFAM::DeleteRecords(PGLOBAL g, int irc) + { + if (irc == RC_EF) { + (void) Tdbp->GetName(); // XXX Should be removed ? + PDOSDEF defp = (PDOSDEF)Tdbp->GetDef(); + + defp->SetBlock(0); + defp->SetLast(Nrec); + + if (!defp->SetIntCatInfo("Blocks", 0) || + !defp->SetIntCatInfo("Last", 0)) { + snprintf(g->Message, sizeof(g->Message), MSG(UPDATE_ERROR), "Header"); + return RC_FX; + } else + return RC_OK; + + } else + return irc; + + } // end of DeleteRecords + +/***********************************************************************/ +/* Data Base close routine for ZBK access method. */ +/***********************************************************************/ +void ZBKFAM::CloseTableFile(PGLOBAL g, bool) + { + int rc = RC_OK; + + if (Tdbp->GetMode() == MODE_INSERT) { + (void) Tdbp->GetName(); // XXX Should be removed? + PDOSDEF defp = (PDOSDEF)Tdbp->GetDef(); + + if (CurNum && !Closing) { + // Some more inserted lines remain to be written + Last = (Nrec - Rbuf) + CurNum; + Block = CurBlk + 1; + Rbuf = CurNum--; + Closing = true; + rc = WriteBuffer(g); + } else if (Rbuf == Nrec) { + Last = Nrec; + Block = CurBlk; + } // endif CurNum + + if (rc != RC_FX) { + defp->SetBlock(Block); + defp->SetLast(Last); + defp->SetIntCatInfo("Blocks", Block); + defp->SetIntCatInfo("Last", Last); + } // endif + + gzclose(Zfile); + } else if (Tdbp->GetMode() == MODE_DELETE) { + rc = DeleteRecords(g, RC_EF); + gzclose(Zfile); + } else + rc = gzclose(Zfile); + + if (trace(1)) + htrc("GZ CloseDB: closing %s rc=%d\n", To_File, rc); + + Zfile = NULL; // So we can know whether table is open +//To_Fb->Count = 0; // Avoid double closing by PlugCloseAll + } // end of CloseTableFile + +/***********************************************************************/ +/* Rewind routine for ZBK access method. */ +/***********************************************************************/ +void ZBKFAM::Rewind(void) + { + gzrewind(Zfile); + CurBlk = -1; + CurNum = Rbuf; + } // end of Rewind + +/* ------------------------------------------------------------------- */ + +/***********************************************************************/ +/* Constructors. */ +/***********************************************************************/ +GZXFAM::GZXFAM(PDOSDEF tdp) : ZBKFAM(tdp) + { +//Block = tdp->GetBlock(); +//Last = tdp->GetLast(); + Nrec = (tdp->GetElemt()) ? tdp->GetElemt() : DOS_BUFF_LEN; + Blksize = Nrec * Lrecl; + } // end of GZXFAM standard constructor + +/***********************************************************************/ +/* ZIX Cardinality: returns table cardinality in number of rows. */ +/* This function can be called with a null argument to test the */ +/* availability of Cardinality implementation (1 yes, 0 no). */ +/***********************************************************************/ +int GZXFAM::Cardinality(PGLOBAL g) + { + if (Last) + return (g) ? (int)((Block - 1) * Nrec + Last) : 1; + else // Last and Block not defined, cannot do it yet + return 0; + + } // end of Cardinality + +/***********************************************************************/ +/* Allocate the line buffer. For mode Delete a bigger buffer has to */ +/* be allocated because is it also used to move lines into the file. */ +/***********************************************************************/ +bool GZXFAM::AllocateBuffer(PGLOBAL g) + { + Buflen = Blksize; + To_Buf = (char*)PlugSubAlloc(g, NULL, Buflen); + + if (Tdbp->GetMode() == MODE_INSERT) { + /*******************************************************************/ + /* For Insert the buffer must be prepared. */ + /*******************************************************************/ + memset(To_Buf, ' ', Buflen); + + if (Tdbp->GetFtype() < 2) + // if not binary, the file is physically a text file + for (int len = Lrecl; len <= Buflen; len += Lrecl) { +#if defined(_WIN32) + To_Buf[len - 2] = '\r'; +#endif // _WIN32 + To_Buf[len - 1] = '\n'; + } // endfor len + + // Set values so Block and Last can be recalculated + if (Last == Nrec) { + CurBlk = Block; + Rbuf = Nrec; // To be used by WriteDB + } else { + // The last block must be completed + CurBlk = Block - 1; + Rbuf = Nrec - Last; // To be used by WriteDB + } // endif Last + + } // endif Insert + + return false; + } // end of AllocateBuffer + +/***********************************************************************/ +/* ReadBuffer: Read one line from a compressed text file. */ +/***********************************************************************/ +int GZXFAM::ReadBuffer(PGLOBAL g) + { + int n, rc = RC_OK; + + /*********************************************************************/ + /* Sequential reading when Placed is not true. */ + /*********************************************************************/ + if (++CurNum < Rbuf) { + Tdbp->IncLine(Lrecl); // Used by DOSCOL functions + return RC_OK; + } else if (Rbuf < Nrec && CurBlk != -1) + return RC_EF; + + /*********************************************************************/ + /* New block. */ + /*********************************************************************/ + CurNum = 0; + Tdbp->SetLine(To_Buf); + + int skip = 0; + + next: + if (++CurBlk >= Block) + return RC_EF; + + /*********************************************************************/ + /* Before using the new block, check whether block optimization */ + /* can be done, as well as for join as for local filtering. */ + /*********************************************************************/ + switch (Tdbp->TestBlock(g)) { + case RC_EF: + return RC_EF; + case RC_NF: + skip++; + goto next; + } // endswitch rc + + if (skip) + // Skip blocks rejected by block optimization + for (int i = 0; i < skip; i++) { + if (gzseek(Zfile, (z_off_t)Buflen, SEEK_CUR) < 0) + return Zerror(g); + + } // endfor i + + if (!(n = gzread(Zfile, To_Buf, Buflen))) { + rc = RC_EF; + } else if (n > 0) { + Rbuf = n / Lrecl; + IsRead = true; + rc = RC_OK; + num_read++; + } else + rc = Zerror(g); + + return rc; + } // end of ReadBuffer + +/***********************************************************************/ +/* WriteDB: Data Base write routine for ZDOS access method. */ +/* Update is not possible without using a temporary file (NIY). */ +/***********************************************************************/ +int GZXFAM::WriteBuffer(PGLOBAL g) + { + /*********************************************************************/ + /* In Insert mode, blocs are added sequentialy to the file end. */ + /* Note: Update mode is not handled for gz files. */ + /*********************************************************************/ + if (++CurNum == Rbuf) { + /*******************************************************************/ + /* New block, start the writing process. */ + /*******************************************************************/ + BlkLen = Rbuf * Lrecl; + + if (gzwrite(Zfile, To_Buf, BlkLen) != BlkLen || + gzflush(Zfile, Z_FULL_FLUSH)) { + Closing = true; + return Zerror(g); + } // endif gzwrite + + Rbuf = Nrec; + CurBlk++; + CurNum = 0; + Tdbp->SetLine(To_Buf); + } else + Tdbp->IncLine(Lrecl); // Used by FIXCOL functions + + return RC_OK; + } // end of WriteBuffer + +/* --------------------------- Class ZLBFAM -------------------------- */ + +/***********************************************************************/ +/* Constructors. */ +/***********************************************************************/ +ZLBFAM::ZLBFAM(PDOSDEF tdp) : BLKFAM(tdp) + { + Zstream = NULL; + Zbuffer = NULL; + Zlenp = NULL; + Optimized = tdp->IsOptimized(); + } // end of ZLBFAM standard constructor + +ZLBFAM::ZLBFAM(PZLBFAM txfp) : BLKFAM(txfp) + { + Zstream = txfp->Zstream; + Zbuffer = txfp->Zbuffer; + Zlenp = txfp->Zlenp; + Optimized = txfp->Optimized; + } // end of ZLBFAM (dummy?) copy constructor + +/***********************************************************************/ +/* ZLB GetFileLength: returns an estimate of what would be the */ +/* uncompressed file size in number of bytes. */ +/***********************************************************************/ +int ZLBFAM::GetFileLength(PGLOBAL g) + { + int len = (Optimized) ? BlkPos[Block] : BLKFAM::GetFileLength(g); + + if (len > 0) + // Estimate size reduction to a max of 5 + len *= 5; + + return len; + } // end of GetFileLength + +/***********************************************************************/ +/* Allocate the line buffer. For mode Delete a bigger buffer has to */ +/* be allocated because is it also used to move lines into the file. */ +/***********************************************************************/ +bool ZLBFAM::AllocateBuffer(PGLOBAL g) + { + PCSZ msg; + int n, zrc; + +#if 0 + if (!Optimized && Tdbp->NeedIndexing(g)) { + snprintf(g->Message, sizeof(g->Message), MSG(NOP_ZLIB_INDEX)); + return TRUE; + } // endif indexing +#endif // 0 + +#if defined(NOLIB) + if (!zlib && LoadZlib()) { + snprintf(g->Message, sizeof(g->Message), MSG(DLL_LOAD_ERROR), GetLastError(), "zlib.dll"); + return TRUE; + } // endif zlib +#endif + + BLKFAM::AllocateBuffer(g); +//Buflen = Nrec * (Lrecl + 2); +//Rbuf = Nrec; + + // Allocate the compressed buffer + n = Buflen + 16; // ????????????????????????????????? + Zlenp = (int*)PlugSubAlloc(g, NULL, n); + Zbuffer = (Byte*)(Zlenp + 1); + + // Allocate and initialize the Z stream + Zstream = (z_streamp)PlugSubAlloc(g, NULL, sizeof(z_stream)); + Zstream->zalloc = (alloc_func)0; + Zstream->zfree = (free_func)0; + Zstream->opaque = (voidpf)0; + Zstream->next_in = NULL; + Zstream->avail_in = 0; + + if (Tdbp->GetMode() == MODE_READ) { + msg = "inflateInit"; + zrc = inflateInit(Zstream); + } else { + msg = "deflateInit"; + zrc = deflateInit(Zstream, Z_DEFAULT_COMPRESSION); + } // endif Mode + + if (zrc != Z_OK) { + if (Zstream->msg) + snprintf(g->Message, sizeof(g->Message), "%s error: %s", msg, Zstream->msg); + else + snprintf(g->Message, sizeof(g->Message), "%s error: %d", msg, zrc); + + return TRUE; + } // endif zrc + + if (Tdbp->GetMode() == MODE_INSERT) { + // Write the file header block + if (Last == Nrec) { + CurBlk = Block; + CurNum = 0; + + if (!GetFileLength(g)) { + // Write the zlib header as an extra block + strcpy(To_Buf, "PlugDB"); + BlkLen = strlen("PlugDB") + 1; + + if (WriteCompressedBuffer(g)) + return TRUE; + + } // endif void file + + } else { + // In mode insert, if Last != Nrec, last block must be updated + CurBlk = Block - 1; + CurNum = Last; + + snprintf(g->Message, sizeof(g->Message), "%s",MSG(NO_PAR_BLK_INS)); + return TRUE; + } // endif Last + + } else { // MODE_READ + // First thing to do is to read the header block + void *rdbuf; + + if (Optimized) { + BlkLen = BlkPos[0]; + rdbuf = Zlenp; + } else { + // Get the stored length from the file itself + if (fread(Zlenp, sizeof(int), 1, Stream) != 1) + return FALSE; // Empty file + + BlkLen = *Zlenp; + rdbuf = Zbuffer; + } // endif Optimized + + switch (ReadCompressedBuffer(g, rdbuf)) { + case RC_EF: + return FALSE; + case RC_FX: +#if defined(UNIX) + snprintf(g->Message, sizeof(g->Message), MSG(READ_ERROR), To_File, strerror(errno)); +#else + snprintf(g->Message, sizeof(g->Message), MSG(READ_ERROR), To_File, _strerror(NULL)); +#endif + /* falls through */ + case RC_NF: + return TRUE; + } // endswitch + + // Some old tables can have PlugDB in their header + if (strcmp(To_Buf, "PlugDB")) { + snprintf(g->Message, sizeof(g->Message), MSG(BAD_HEADER), Tdbp->GetFile(g)); + return TRUE; + } // endif strcmp + + } // endif Mode + + return FALSE; + } // end of AllocateBuffer + +/***********************************************************************/ +/* GetPos: return the position of last read record. */ +/***********************************************************************/ +int ZLBFAM::GetPos(void) + { + return (Optimized) ? (CurNum + Nrec * CurBlk) : Fpos; + } // end of GetPos + +/***********************************************************************/ +/* GetNextPos: should not be called for this class. */ +/***********************************************************************/ +int ZLBFAM::GetNextPos(void) + { + if (Optimized) { + assert(FALSE); + return 0; + } else + return ftell(Stream); + + } // end of GetNextPos + +/***********************************************************************/ +/* SetPos: Replace the table at the specified position. */ +/***********************************************************************/ +bool ZLBFAM::SetPos(PGLOBAL g, int pos __attribute__((unused))) + { + snprintf(g->Message, sizeof(g->Message), MSG(NO_SETPOS_YET), "GZ"); + return true; +#if 0 // All this must be checked + if (pos < 0) { + snprintf(g->Message, sizeof(g->Message), MSG(INV_REC_POS)); + return true; + } // endif recpos + + CurBlk = pos / Nrec; + CurNum = pos % Nrec; +#if defined(_DEBUG) + num_eq[(CurBlk == OldBlk) ? 1 : 0]++; +#endif + + // Indicate the table position was externally set + Placed = true; + return false; +#endif // 0 + } // end of SetPos + +/***********************************************************************/ +/* ReadBuffer: Read one line for a text file. */ +/***********************************************************************/ +int ZLBFAM::ReadBuffer(PGLOBAL g) + { + size_t n; + void *rdbuf; + + /*********************************************************************/ + /* Sequential reading when Placed is not true. */ + /*********************************************************************/ + if (Placed) { + Placed = FALSE; + } else if (++CurNum < Rbuf) { + CurLine = NxtLine; + + // Get the position of the next line in the buffer + if (Tdbp->GetFtype() == RECFM_VAR) + while (*NxtLine++ != '\n') ; + else + NxtLine += Lrecl; + + // Set caller line buffer + n = NxtLine - CurLine - ((Tdbp->GetFtype() == RECFM_BIN) ? 0 : Ending); + memcpy(Tdbp->GetLine(), CurLine, n); + Tdbp->GetLine()[n] = '\0'; + return RC_OK; + } else if (Rbuf < Nrec && CurBlk != -1) { + CurNum--; // To have a correct Last value when optimizing + return RC_EF; + } else { + /*******************************************************************/ + /* New block. */ + /*******************************************************************/ + CurNum = 0; + + next: + if (++CurBlk >= Block) + return RC_EF; + + /*******************************************************************/ + /* Before reading a new block, check whether block optimization */ + /* can be done, as well as for join as for local filtering. */ + /*******************************************************************/ + if (Optimized) switch (Tdbp->TestBlock(g)) { + case RC_EF: + return RC_EF; + case RC_NF: + goto next; + } // endswitch rc + + } // endif's + + if (OldBlk == CurBlk) + goto ok; // Block is already there + + if (Optimized) { + // Store the position of next block + Fpos = BlkPos[CurBlk]; + + // fseek is required only in non sequential reading + if (CurBlk != OldBlk + 1) + if (fseek(Stream, Fpos, SEEK_SET)) { + snprintf(g->Message, sizeof(g->Message), MSG(FSETPOS_ERROR), Fpos); + return RC_FX; + } // endif fseek + + // Calculate the length of block to read + BlkLen = BlkPos[CurBlk + 1] - Fpos; + rdbuf = Zlenp; + } else { // !Optimized + if (CurBlk != OldBlk + 1) { + snprintf(g->Message, sizeof(g->Message), MSG(INV_RAND_ACC)); + return RC_FX; + } else + Fpos = ftell(Stream); // Used when optimizing + + // Get the stored length from the file itself + if (fread(Zlenp, sizeof(int), 1, Stream) != 1) { + if (feof(Stream)) + return RC_EF; + + goto err; + } // endif fread + + BlkLen = *Zlenp; + rdbuf = Zbuffer; + } // endif Optimized + + // Read the next block + switch (ReadCompressedBuffer(g, rdbuf)) { + case RC_FX: goto err; + case RC_NF: return RC_FX; + case RC_EF: return RC_EF; + default: Rbuf = (CurBlk == Block - 1) ? Last : Nrec; + } // endswitch ReadCompressedBuffer + + ok: + if (Tdbp->GetFtype() == RECFM_VAR) { + int i; + + // Get the position of the current line + for (i = 0, CurLine = To_Buf; i < CurNum; i++) + while (*CurLine++ != '\n') ; // What about Unix ??? + + // Now get the position of the next line + for (NxtLine = CurLine; *NxtLine++ != '\n';) ; + + // Set caller line buffer + n = NxtLine - CurLine - Ending; + } else { + CurLine = To_Buf + CurNum * Lrecl; + NxtLine = CurLine + Lrecl; + n = Lrecl - ((Tdbp->GetFtype() == RECFM_BIN) ? 0 : Ending); + } // endif Ftype + + memcpy(Tdbp->GetLine(), CurLine, n); + Tdbp->GetLine()[n] = '\0'; + + OldBlk = CurBlk; // Last block actually read + IsRead = TRUE; // Is read indeed + return RC_OK; + + err: +#if defined(UNIX) + snprintf(g->Message, sizeof(g->Message), MSG(READ_ERROR), To_File, strerror(errno)); +#else + snprintf(g->Message, sizeof(g->Message), MSG(READ_ERROR), To_File, _strerror(NULL)); +#endif + return RC_FX; + } // end of ReadBuffer + +/***********************************************************************/ +/* Read and decompress a block from the stream. */ +/***********************************************************************/ +int ZLBFAM::ReadCompressedBuffer(PGLOBAL g, void *rdbuf) + { + if (fread(rdbuf, 1, (size_t)BlkLen, Stream) == (unsigned)BlkLen) { + int zrc; + + num_read++; + + if (Optimized && BlkLen != signed(*Zlenp + sizeof(int))) { + snprintf(g->Message, sizeof(g->Message), MSG(BAD_BLK_SIZE), CurBlk + 1); + return RC_NF; + } // endif BlkLen + + // HERE WE MUST INFLATE THE BLOCK + Zstream->next_in = Zbuffer; + Zstream->avail_in = (uInt)(*Zlenp); + Zstream->next_out = (Byte*)To_Buf; + Zstream->avail_out = Buflen; + zrc = inflate(Zstream, Z_SYNC_FLUSH); + + if (zrc != Z_OK) { + if (Zstream->msg) + snprintf(g->Message, sizeof(g->Message), MSG(FUNC_ERR_S), "inflate", Zstream->msg); + else + snprintf(g->Message, sizeof(g->Message), MSG(FUNCTION_ERROR), "inflate", (int)zrc); + + return RC_NF; + } // endif zrc + + } else if (feof(Stream)) { + return RC_EF; + } else + return RC_FX; + + return RC_OK; + } // end of ReadCompressedBuffer + +/***********************************************************************/ +/* WriteBuffer: File write routine for DOS access method. */ +/* Update is directly written back into the file, */ +/* with this (fast) method, record size cannot change. */ +/***********************************************************************/ +int ZLBFAM::WriteBuffer(PGLOBAL g) + { + assert (Tdbp->GetMode() == MODE_INSERT); + + /*********************************************************************/ + /* Prepare the write buffer. */ + /*********************************************************************/ + if (!Closing) { + if (Tdbp->GetFtype() == RECFM_BIN) + memcpy(CurLine, Tdbp->GetLine(), Lrecl); + else + strcat(strcpy(CurLine, Tdbp->GetLine()), CrLf); + +#if defined(_DEBUG) + if (Tdbp->GetFtype() == RECFM_FIX && + (signed)strlen(CurLine) != Lrecl + (signed)strlen(CrLf)) { + snprintf(g->Message, sizeof(g->Message), MSG(BAD_LINE_LEN)); + Closing = TRUE; + return RC_FX; + } // endif Lrecl +#endif // _DEBUG + } // endif Closing + + /*********************************************************************/ + /* In Insert mode, blocs are added sequentialy to the file end. */ + /*********************************************************************/ + if (++CurNum != Rbuf) { + if (Tdbp->GetFtype() == RECFM_VAR) + CurLine += strlen(CurLine); + else + CurLine += Lrecl; + + return RC_OK; // We write only full blocks + } // endif CurNum + + // HERE WE MUST DEFLATE THE BLOCK + if (Tdbp->GetFtype() == RECFM_VAR) + NxtLine = CurLine + strlen(CurLine); + else + NxtLine = CurLine + Lrecl; + + BlkLen = (int)(NxtLine - To_Buf); + + if (WriteCompressedBuffer(g)) { + Closing = TRUE; // To tell CloseDB about a Write error + return RC_FX; + } // endif WriteCompressedBuffer + + CurBlk++; + CurNum = 0; + CurLine = To_Buf; + return RC_OK; + } // end of WriteBuffer + +/***********************************************************************/ +/* Compress the buffer and write the deflated output to stream. */ +/***********************************************************************/ +bool ZLBFAM::WriteCompressedBuffer(PGLOBAL g) + { + int zrc; + + Zstream->next_in = (Byte*)To_Buf; + Zstream->avail_in = (uInt)BlkLen; + Zstream->next_out = Zbuffer; + Zstream->avail_out = Buflen + 16; + Zstream->total_out = 0; + zrc = deflate(Zstream, Z_FULL_FLUSH); + + if (zrc != Z_OK) { + if (Zstream->msg) + snprintf(g->Message, sizeof(g->Message), MSG(FUNC_ERR_S), "deflate", Zstream->msg); + else + snprintf(g->Message, sizeof(g->Message), MSG(FUNCTION_ERROR), "deflate", (int)zrc); + + return TRUE; + } else + *Zlenp = Zstream->total_out; + + // Now start the writing process. + BlkLen = *Zlenp + sizeof(int); + + if (fwrite(Zlenp, 1, BlkLen, Stream) != (size_t)BlkLen) { + snprintf(g->Message, sizeof(g->Message), MSG(FWRITE_ERROR), strerror(errno)); + return TRUE; + } // endif size + + return FALSE; + } // end of WriteCompressedBuffer + +/***********************************************************************/ +/* Table file close routine for DOS access method. */ +/***********************************************************************/ +void ZLBFAM::CloseTableFile(PGLOBAL g, bool) + { + int rc = RC_OK; + + if (Tdbp->GetMode() == MODE_INSERT) { + (void) Tdbp->GetName(); // XXX Should be removed? + PDOSDEF defp = (PDOSDEF)Tdbp->GetDef(); + + // Closing is True if last Write was in error + if (CurNum && !Closing) { + // Some more inserted lines remain to be written + Last = (Nrec - Rbuf) + CurNum; + Block = CurBlk + 1; + Rbuf = CurNum--; + Closing = TRUE; + rc = WriteBuffer(g); + } else if (Rbuf == Nrec) { + Last = Nrec; + Block = CurBlk; + } // endif CurNum + + if (rc != RC_FX) { + defp->SetBlock(Block); + defp->SetLast(Last); + defp->SetIntCatInfo("Blocks", Block); + defp->SetIntCatInfo("Last", Last); + } // endif + + fclose(Stream); + } else + rc = fclose(Stream); + + if (trace(1)) + htrc("ZLB CloseTableFile: closing %s mode=%d rc=%d\n", + To_File, Tdbp->GetMode(), rc); + + Stream = NULL; // So we can know whether table is open + To_Fb->Count = 0; // Avoid double closing by PlugCloseAll + + if (Tdbp->GetMode() == MODE_READ) + rc = inflateEnd(Zstream); + else + rc = deflateEnd(Zstream); + + } // end of CloseTableFile + +/***********************************************************************/ +/* Rewind routine for ZLIB access method. */ +/***********************************************************************/ +void ZLBFAM::Rewind(void) + { + // We must be positioned after the header block + if (CurBlk >= 0) { // Nothing to do if no block read yet + if (!Optimized) { // If optimized, fseek will be done in ReadBuffer + size_t st; + + rewind(Stream); + + if (!(st = fread(Zlenp, sizeof(int), 1, Stream)) && trace(1)) + htrc("fread error %d in Rewind", errno); + + fseek(Stream, *Zlenp + sizeof(int), SEEK_SET); + OldBlk = -1; + } // endif Optimized + + CurBlk = -1; + CurNum = Rbuf; + } // endif CurBlk + +//OldBlk = -1; +//Rbuf = 0; commented out in case we reuse last read block + } // end of Rewind + +/* ------------------------ End of GzFam ---------------------------- */ |