2000-07-21 13:40:08 +02:00
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/*-------------------------------------------------------------------------
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*
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* pg_backup_files.c
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*
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* This file is copied from the 'custom' format file, but dumps data into
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* separate files, and the TOC into the 'main' file.
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*
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* IT IS FOR DEMONSTRATION PURPOSES ONLY.
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*
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* (and could probably be used as a basis for writing a tar file)
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*
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* See the headers to pg_restore for more details.
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*
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* Copyright (c) 2000, Philip Warner
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* Rights are granted to use this software in any way so long
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* as this notice is not removed.
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*
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* The author is not responsible for loss or damages that may
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* result from it's use.
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*
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*
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* IDENTIFICATION
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*
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* Modifications - 28-Jun-2000 - pjw@rhyme.com.au
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*
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* Initial version.
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*
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2001-01-12 05:32:07 +01:00
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* Modifications - 04-Jan-2001 - pjw@rhyme.com.au
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*
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* - Check results of IO routines more carefully.
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*
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2000-07-21 13:40:08 +02:00
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*-------------------------------------------------------------------------
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*/
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#include "pg_backup.h"
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#include "pg_backup_archiver.h"
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2001-02-10 03:31:31 +01:00
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#include <stdlib.h>
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#include <string.h>
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2000-07-21 13:40:08 +02:00
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static void _ArchiveEntry(ArchiveHandle* AH, TocEntry* te);
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static void _StartData(ArchiveHandle* AH, TocEntry* te);
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static int _WriteData(ArchiveHandle* AH, const void* data, int dLen);
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static void _EndData(ArchiveHandle* AH, TocEntry* te);
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static int _WriteByte(ArchiveHandle* AH, const int i);
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static int _ReadByte(ArchiveHandle* );
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static int _WriteBuf(ArchiveHandle* AH, const void* buf, int len);
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static int _ReadBuf(ArchiveHandle* AH, void* buf, int len);
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static void _CloseArchive(ArchiveHandle* AH);
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static void _PrintTocData(ArchiveHandle* AH, TocEntry* te, RestoreOptions *ropt);
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static void _WriteExtraToc(ArchiveHandle* AH, TocEntry* te);
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static void _ReadExtraToc(ArchiveHandle* AH, TocEntry* te);
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static void _PrintExtraToc(ArchiveHandle* AH, TocEntry* te);
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static void _StartBlobs(ArchiveHandle* AH, TocEntry* te);
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static void _StartBlob(ArchiveHandle* AH, TocEntry* te, int oid);
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static void _EndBlob(ArchiveHandle* AH, TocEntry* te, int oid);
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static void _EndBlobs(ArchiveHandle* AH, TocEntry* te);
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#define K_STD_BUF_SIZE 1024
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typedef struct {
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int hasSeek;
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int filePos;
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FILE *blobToc;
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} lclContext;
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typedef struct {
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#ifdef HAVE_LIBZ
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gzFile *FH;
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#else
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FILE *FH;
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#endif
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char *filename;
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} lclTocEntry;
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static char* progname = "Archiver(files)";
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static void _LoadBlobs(ArchiveHandle* AH, RestoreOptions *ropt);
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static void _getBlobTocEntry(ArchiveHandle* AH, int *oid, char *fname);
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/*
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* Initializer
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*/
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void InitArchiveFmt_Files(ArchiveHandle* AH)
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{
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lclContext* ctx;
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/* Assuming static functions, this can be copied for each format. */
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AH->ArchiveEntryPtr = _ArchiveEntry;
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AH->StartDataPtr = _StartData;
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AH->WriteDataPtr = _WriteData;
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AH->EndDataPtr = _EndData;
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AH->WriteBytePtr = _WriteByte;
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AH->ReadBytePtr = _ReadByte;
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AH->WriteBufPtr = _WriteBuf;
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AH->ReadBufPtr = _ReadBuf;
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AH->ClosePtr = _CloseArchive;
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AH->PrintTocDataPtr = _PrintTocData;
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AH->ReadExtraTocPtr = _ReadExtraToc;
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AH->WriteExtraTocPtr = _WriteExtraToc;
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AH->PrintExtraTocPtr = _PrintExtraToc;
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AH->StartBlobsPtr = _StartBlobs;
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AH->StartBlobPtr = _StartBlob;
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AH->EndBlobPtr = _EndBlob;
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AH->EndBlobsPtr = _EndBlobs;
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/*
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* Set up some special context used in compressing data.
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*/
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ctx = (lclContext*)malloc(sizeof(lclContext));
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AH->formatData = (void*)ctx;
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ctx->filePos = 0;
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/*
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* Now open the TOC file
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*/
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if (AH->mode == archModeWrite) {
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fprintf(stderr, "\n*************************************************************\n"
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"* WARNING: This format is for demonstration purposes. It is *\n"
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"* not intended for general use. Files will be dumped *\n"
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"* into the current working directory. *\n"
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"***************************************************************\n\n");
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if (AH->fSpec && strcmp(AH->fSpec,"") != 0) {
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AH->FH = fopen(AH->fSpec, PG_BINARY_W);
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} else {
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AH->FH = stdout;
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}
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2001-01-12 05:32:07 +01:00
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if (AH->FH == NULL)
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die_horribly(NULL, "%s: Could not open output file\n", progname);
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2000-07-21 13:40:08 +02:00
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ctx->hasSeek = (fseek(AH->FH, 0, SEEK_CUR) == 0);
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if (AH->compression < 0 || AH->compression > 9) {
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AH->compression = Z_DEFAULT_COMPRESSION;
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}
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} else { /* Read Mode */
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if (AH->fSpec && strcmp(AH->fSpec,"") != 0) {
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AH->FH = fopen(AH->fSpec, PG_BINARY_R);
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} else {
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AH->FH = stdin;
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}
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2001-01-12 05:32:07 +01:00
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if (AH->FH == NULL)
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die_horribly(NULL, "%s: Could not open input file\n", progname);
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2000-07-21 13:40:08 +02:00
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ctx->hasSeek = (fseek(AH->FH, 0, SEEK_CUR) == 0);
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ReadHead(AH);
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ReadToc(AH);
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fclose(AH->FH); /* Nothing else in the file... */
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}
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}
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/*
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* - Start a new TOC entry
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* Setup the output file name.
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*/
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static void _ArchiveEntry(ArchiveHandle* AH, TocEntry* te)
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{
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lclTocEntry* ctx;
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char fn[K_STD_BUF_SIZE];
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ctx = (lclTocEntry*)malloc(sizeof(lclTocEntry));
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if (te->dataDumper) {
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#ifdef HAVE_LIBZ
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if (AH->compression == 0) {
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sprintf(fn, "%d.dat", te->id);
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} else {
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sprintf(fn, "%d.dat.gz", te->id);
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}
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#else
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sprintf(fn, "%d.dat", te->id);
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#endif
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ctx->filename = strdup(fn);
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} else {
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ctx->filename = NULL;
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ctx->FH = NULL;
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}
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te->formatData = (void*)ctx;
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}
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static void _WriteExtraToc(ArchiveHandle* AH, TocEntry* te)
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{
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lclTocEntry* ctx = (lclTocEntry*)te->formatData;
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if (ctx->filename) {
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WriteStr(AH, ctx->filename);
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} else {
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WriteStr(AH, "");
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}
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}
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static void _ReadExtraToc(ArchiveHandle* AH, TocEntry* te)
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{
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lclTocEntry* ctx = (lclTocEntry*)te->formatData;
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if (ctx == NULL) {
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ctx = (lclTocEntry*)malloc(sizeof(lclTocEntry));
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te->formatData = (void*)ctx;
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}
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ctx->filename = ReadStr(AH);
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if (strlen(ctx->filename) == 0) {
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free(ctx->filename);
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ctx->filename = NULL;
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}
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ctx->FH = NULL;
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}
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static void _PrintExtraToc(ArchiveHandle* AH, TocEntry* te)
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{
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lclTocEntry* ctx = (lclTocEntry*)te->formatData;
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ahprintf(AH, "-- File: %s\n", ctx->filename);
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}
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static void _StartData(ArchiveHandle* AH, TocEntry* te)
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{
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lclTocEntry* tctx = (lclTocEntry*)te->formatData;
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char fmode[10];
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sprintf(fmode, "wb%d", AH->compression);
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#ifdef HAVE_LIBZ
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tctx->FH = gzopen(tctx->filename, fmode);
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#else
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tctx->FH = fopen(tctx->filename, PG_BINARY_W);
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#endif
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2001-01-12 05:32:07 +01:00
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if (tctx->FH == NULL)
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die_horribly(AH, "%s: Could not open data file for output\n", progname);
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2000-07-21 13:40:08 +02:00
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}
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static int _WriteData(ArchiveHandle* AH, const void* data, int dLen)
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{
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lclTocEntry* tctx = (lclTocEntry*)AH->currToc->formatData;
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GZWRITE((void*)data, 1, dLen, tctx->FH);
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return dLen;
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}
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static void _EndData(ArchiveHandle* AH, TocEntry* te)
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{
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lclTocEntry* tctx = (lclTocEntry*) te->formatData;
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/* Close the file */
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GZCLOSE(tctx->FH);
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tctx->FH = NULL;
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}
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/*
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* Print data for a given file
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*/
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static void _PrintFileData(ArchiveHandle* AH, char *filename, RestoreOptions *ropt)
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{
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char buf[4096];
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int cnt;
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if (!filename)
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return;
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#ifdef HAVE_LIBZ
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AH->FH = gzopen(filename,"rb");
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#else
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AH->FH = fopen(filename,PG_BINARY_R);
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#endif
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2001-01-12 05:32:07 +01:00
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if (AH->FH == NULL)
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die_horribly(AH, "%s: Could not open data file for input\n", progname);
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2000-07-21 13:40:08 +02:00
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while ( (cnt = GZREAD(buf, 1, 4095, AH->FH)) > 0) {
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buf[cnt] = '\0';
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ahwrite(buf, 1, cnt, AH);
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}
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GZCLOSE(AH->FH);
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}
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/*
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* Print data for a given TOC entry
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*/
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static void _PrintTocData(ArchiveHandle* AH, TocEntry* te, RestoreOptions *ropt)
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{
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lclTocEntry* tctx = (lclTocEntry*) te->formatData;
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if (!tctx->filename)
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return;
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if (strcmp(te->desc, "BLOBS") == 0)
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_LoadBlobs(AH, ropt);
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else
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{
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_PrintFileData(AH, tctx->filename, ropt);
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}
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}
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static void _getBlobTocEntry(ArchiveHandle* AH, int *oid, char fname[K_STD_BUF_SIZE])
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{
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lclContext* ctx = (lclContext*)AH->formatData;
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char blobTe[K_STD_BUF_SIZE];
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int fpos;
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int eos;
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if (fgets(&blobTe[0], K_STD_BUF_SIZE - 1, ctx->blobToc) != NULL)
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{
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*oid = atoi(blobTe);
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fpos = strcspn(blobTe, " ");
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strncpy(fname, &blobTe[fpos+1], K_STD_BUF_SIZE - 1);
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eos = strlen(fname)-1;
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if (fname[eos] == '\n')
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fname[eos] = '\0';
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} else {
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*oid = 0;
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fname[0] = '\0';
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}
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}
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static void _LoadBlobs(ArchiveHandle* AH, RestoreOptions *ropt)
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{
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int oid;
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lclContext* ctx = (lclContext*)AH->formatData;
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char fname[K_STD_BUF_SIZE];
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2000-10-31 15:20:30 +01:00
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StartRestoreBlobs(AH);
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2000-07-21 13:40:08 +02:00
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ctx->blobToc = fopen("blobs.toc", PG_BINARY_R);
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2001-01-12 05:32:07 +01:00
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if (ctx->blobToc == NULL)
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die_horribly(AH, "%s: Could not open BLOB TOC for input\n", progname);
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2000-07-21 13:40:08 +02:00
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_getBlobTocEntry(AH, &oid, fname);
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while(oid != 0)
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{
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StartRestoreBlob(AH, oid);
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_PrintFileData(AH, fname, ropt);
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EndRestoreBlob(AH, oid);
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_getBlobTocEntry(AH, &oid, fname);
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}
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fclose(ctx->blobToc);
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2000-10-31 15:20:30 +01:00
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EndRestoreBlobs(AH);
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2000-07-21 13:40:08 +02:00
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}
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static int _WriteByte(ArchiveHandle* AH, const int i)
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{
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lclContext* ctx = (lclContext*)AH->formatData;
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2001-01-12 05:32:07 +01:00
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if (fputc(i, AH->FH) == EOF)
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die_horribly(AH, "%s: could not write byte\n", progname);
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ctx->filePos += 1;
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return 1;
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2000-07-21 13:40:08 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
static int _ReadByte(ArchiveHandle* AH)
|
|
|
|
{
|
|
|
|
lclContext* ctx = (lclContext*)AH->formatData;
|
|
|
|
int res;
|
|
|
|
|
|
|
|
res = fgetc(AH->FH);
|
|
|
|
if (res != EOF) {
|
|
|
|
ctx->filePos += 1;
|
|
|
|
}
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int _WriteBuf(ArchiveHandle* AH, const void* buf, int len)
|
|
|
|
{
|
|
|
|
lclContext* ctx = (lclContext*)AH->formatData;
|
|
|
|
int res;
|
|
|
|
res = fwrite(buf, 1, len, AH->FH);
|
2001-01-12 05:32:07 +01:00
|
|
|
if (res != len)
|
|
|
|
die_horribly(AH, "%s: write error in _WriteBuf (%d != %d)\n", progname, res, len);
|
|
|
|
|
2000-07-21 13:40:08 +02:00
|
|
|
ctx->filePos += res;
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int _ReadBuf(ArchiveHandle* AH, void* buf, int len)
|
|
|
|
{
|
|
|
|
lclContext* ctx = (lclContext*)AH->formatData;
|
|
|
|
int res;
|
|
|
|
|
|
|
|
res = fread(buf, 1, len, AH->FH);
|
|
|
|
ctx->filePos += res;
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void _CloseArchive(ArchiveHandle* AH)
|
|
|
|
{
|
|
|
|
if (AH->mode == archModeWrite) {
|
|
|
|
WriteHead(AH);
|
|
|
|
WriteToc(AH);
|
|
|
|
fclose(AH->FH);
|
|
|
|
WriteDataChunks(AH);
|
|
|
|
}
|
|
|
|
|
|
|
|
AH->FH = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* BLOB support
|
|
|
|
*/
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Called by the archiver when starting to save all BLOB DATA (not schema).
|
|
|
|
* This routine should save whatever format-specific information is needed
|
|
|
|
* to read the BLOBs back into memory.
|
|
|
|
*
|
|
|
|
* It is called just prior to the dumper's DataDumper routine.
|
|
|
|
*
|
|
|
|
* Optional, but strongly recommended.
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
static void _StartBlobs(ArchiveHandle* AH, TocEntry* te)
|
|
|
|
{
|
|
|
|
lclContext* ctx = (lclContext*)AH->formatData;
|
|
|
|
char fname[K_STD_BUF_SIZE];
|
|
|
|
|
|
|
|
sprintf(fname, "blobs.toc");
|
|
|
|
ctx->blobToc = fopen(fname, PG_BINARY_W);
|
2001-01-12 05:32:07 +01:00
|
|
|
|
|
|
|
if (ctx->blobToc == NULL)
|
|
|
|
die_horribly(AH, "%s: could not open BLOB TOC for output\n", progname);
|
|
|
|
|
2000-07-21 13:40:08 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Called by the archiver when the dumper calls StartBlob.
|
|
|
|
*
|
|
|
|
* Mandatory.
|
|
|
|
*
|
|
|
|
* Must save the passed OID for retrieval at restore-time.
|
|
|
|
*/
|
|
|
|
static void _StartBlob(ArchiveHandle* AH, TocEntry* te, int oid)
|
|
|
|
{
|
|
|
|
lclContext* ctx = (lclContext*)AH->formatData;
|
|
|
|
lclTocEntry* tctx = (lclTocEntry*)te->formatData;
|
|
|
|
char fmode[10];
|
|
|
|
char fname[255];
|
|
|
|
char *sfx;
|
|
|
|
|
|
|
|
if (oid == 0)
|
|
|
|
die_horribly(AH, "%s: illegal OID for BLOB (%d)\n", progname, oid);
|
|
|
|
|
|
|
|
if (AH->compression != 0)
|
|
|
|
sfx = ".gz";
|
|
|
|
else
|
|
|
|
sfx = "";
|
|
|
|
|
|
|
|
sprintf(fmode, "wb%d", AH->compression);
|
|
|
|
sprintf(fname, "blob_%d.dat%s", oid, sfx);
|
|
|
|
|
|
|
|
fprintf(ctx->blobToc, "%d %s\n", oid, fname);
|
|
|
|
|
|
|
|
#ifdef HAVE_LIBZ
|
|
|
|
tctx->FH = gzopen(fname, fmode);
|
|
|
|
#else
|
|
|
|
tctx->FH = fopen(fname, PG_BINARY_W);
|
|
|
|
#endif
|
|
|
|
|
2001-01-12 05:32:07 +01:00
|
|
|
if (tctx->FH == NULL)
|
|
|
|
die_horribly(AH, "%s: Could not open BLOB file\n", progname);
|
2000-07-21 13:40:08 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Called by the archiver when the dumper calls EndBlob.
|
|
|
|
*
|
|
|
|
* Optional.
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
static void _EndBlob(ArchiveHandle* AH, TocEntry* te, int oid)
|
|
|
|
{
|
|
|
|
lclTocEntry* tctx = (lclTocEntry*)te->formatData;
|
|
|
|
|
|
|
|
GZCLOSE(tctx->FH);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Called by the archiver when finishing saving all BLOB DATA.
|
|
|
|
*
|
|
|
|
* Optional.
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
static void _EndBlobs(ArchiveHandle* AH, TocEntry* te)
|
|
|
|
{
|
|
|
|
lclContext* ctx = (lclContext*)AH->formatData;
|
|
|
|
/* Write out a fake zero OID to mark end-of-blobs. */
|
|
|
|
/* WriteInt(AH, 0); */
|
|
|
|
|
|
|
|
fclose(ctx->blobToc);
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|