pg_backup_archiver.c

/*-------------------------------------------------------------------------
 *
 * pg_backup_archiver.c
 *
 *	Private implementation of the archiver routines.
 *
 *	See the headers to pg_restore for more details.
 *
 * Copyright (c) 2000, Philip Warner
 *	Rights are granted to use this software in any way so long
 * 	as this notice is not removed.
 *
 *	The author is not responsible for loss or damages that may
 *	result from it's use.
 *
 *
 * IDENTIFICATION
 *
 * Modifications - 28-Jun-2000 - pjw@rhyme.com.au
 *
 *		Initial version. 
 *
 * Modifications - 31-Jul-2000 - pjw@rhyme.com.au (1.46, 1.47)
 *		Fixed version number initialization in _allocAH (pg_backup_archiver.c)
 *
 *
 * Modifications - 30-Oct-2000 - pjw@rhyme.com.au
 *		Added {Start,End}RestoreBlobs to allow extended TX during BLOB restore.
 *
 * Modifications - 04-Jan-2001 - pjw@rhyme.com.au
 *	  -	strdup() the current user just in case it's deallocated from it's TOC
 *      entry. Should *never* happen, but that's what they said about the 
 *      Titanic...
 *
 *	  - Check results of IO routines more carefully.
 *
 * Modifications - 27-Jan-2001 - pjw@rhyme.com.au
 *	  - When dropping the schema, reconnect as owner of each object.
 *
 *-------------------------------------------------------------------------
 */

#include "pg_backup.h"
#include "pg_backup_archiver.h"
#include "pg_backup_db.h"

#include <string.h>
#include <unistd.h> /* for dup */

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>

#include "pqexpbuffer.h"
#include "libpq/libpq-fs.h"

static void		_SortToc(ArchiveHandle* AH, TocSortCompareFn fn);
static int		_tocSortCompareByOIDNum(const void *p1, const void *p2);
static int		_tocSortCompareByIDNum(const void *p1, const void *p2);
static ArchiveHandle* 	_allocAH(const char* FileSpec, const ArchiveFormat fmt, 
				const int compression, ArchiveMode mode);
static int 		_printTocEntry(ArchiveHandle* AH, TocEntry* te, RestoreOptions *ropt);

static void		_reconnectAsOwner(ArchiveHandle* AH, const char *dbname, TocEntry* te);
static void		_reconnectAsUser(ArchiveHandle* AH, const char *dbname, char *user);

static int		_tocEntryRequired(TocEntry* te, RestoreOptions *ropt);
static void		_disableTriggers(ArchiveHandle *AH, TocEntry *te, RestoreOptions *ropt);
static void		_enableTriggers(ArchiveHandle *AH, TocEntry *te, RestoreOptions *ropt);
static TocEntry*	_getTocEntry(ArchiveHandle* AH, int id);
static void		_moveAfter(ArchiveHandle* AH, TocEntry* pos, TocEntry* te);
static void		_moveBefore(ArchiveHandle* AH, TocEntry* pos, TocEntry* te);
static int		_discoverArchiveFormat(ArchiveHandle* AH);

static char	*progname = "Archiver";

static void		_die_horribly(ArchiveHandle *AH, const char *fmt, va_list ap);

static int 		_canRestoreBlobs(ArchiveHandle *AH);
static int 		_restoringToDB(ArchiveHandle *AH);

/*
 *  Wrapper functions.
 * 
 *  The objective it to make writing new formats and dumpers as simple
 *  as possible, if necessary at the expense of extra function calls etc.
 *
 */


/* Create a new archive */
/* Public */
Archive* CreateArchive(const char* FileSpec, const ArchiveFormat fmt,
                                const int compression)

{
    ArchiveHandle*	AH = _allocAH(FileSpec, fmt, compression, archModeWrite);
    return (Archive*)AH;
}

/* Open an existing archive */
/* Public */
Archive* OpenArchive(const char* FileSpec, const ArchiveFormat fmt) 
{
    ArchiveHandle*      AH = _allocAH(FileSpec, fmt, 0, archModeRead);
    return (Archive*)AH;
}

/* Public */
void	CloseArchive(Archive* AHX)
{
	int					res = 0;
    ArchiveHandle*      AH = (ArchiveHandle*)AHX;
    (*AH->ClosePtr)(AH);

    /* Close the output */
    if (AH->gzOut)
		res = GZCLOSE(AH->OF);
    else if (AH->OF != stdout)
		res = fclose(AH->OF);

	if (res != 0)
		die_horribly(AH, "%s: could not close the output file in CloseArchive\n", progname);
}

/* Public */
void RestoreArchive(Archive* AHX, RestoreOptions *ropt)
{
    ArchiveHandle*	AH = (ArchiveHandle*) AHX;
    TocEntry		*te = AH->toc->next;
    int			reqs;
    OutputContext	sav;

	AH->ropt = ropt;

	if (ropt->create && ropt->noReconnect)
		die_horribly(AH, "%s: --create and --no-reconnect are incompatible options\n",progname);

	/*
	 * If we're using a DB connection, then connect it.
	 */
	if (ropt->useDB)
	{
		ahlog(AH, 1, "Connecting to database for restore\n");
		if (AH->version < K_VERS_1_3)
			die_horribly(AH, "Direct database connections are not supported in pre-1.3 archives");

		ConnectDatabase(AHX, ropt->dbname, ropt->pghost, ropt->pgport, 
							ropt->requirePassword, ropt->ignoreVersion);

		/*
		 * If no superuser was specified then see if the current user will do...
		 */
		if (!ropt->superuser)
		{
			if (UserIsSuperuser(AH, ConnectedUser(AH)))
				ropt->superuser = strdup(ConnectedUser(AH));
		}

	}

	if (!ropt->superuser)
		fprintf(stderr, "\n%s: ******** WARNING ******** \n"
							"        Data restoration may fail since any defined triggers\n"
							"        can not be disabled (no superuser username specified).\n"
							"        This is only a problem for restoration into a database\n"
							"        with triggers already defined.\n\n", progname);

	/*
	 *	Setup the output file if necessary.
	 */
    if (ropt->filename || ropt->compression)
		sav = SetOutput(AH, ropt->filename, ropt->compression);

    ahprintf(AH, "--\n-- Selected TOC Entries:\n--\n");

    /*
     * Drop the items at the start, in reverse order 
	 */
    if (ropt->dropSchema) {
		te = AH->toc->prev;
		while (te != AH->toc) {
			reqs = _tocEntryRequired(te, ropt);
			if ( ( (reqs & 1) != 0) && te->dropStmt) {  /* We want the schema */
				ahlog(AH, 1, "Dropping %s %s\n", te->desc, te->name);
				/* Reconnect if necessary */
				_reconnectAsOwner(AH, "-", te);
				/* Drop it */
				ahprintf(AH, "%s", te->dropStmt);
			}
			te = te->prev;
		}
    }

	/*
	 * Now process each TOC entry
	 */
    te = AH->toc->next;
    while (te != AH->toc) {

		/* Work out what, if anything, we want from this entry */
		reqs = _tocEntryRequired(te, ropt);

		if ( (reqs & 1) != 0) /* We want the schema */
		{
			/* Reconnect if necessary */
			_reconnectAsOwner(AH, "-", te);

			ahlog(AH, 1, "Creating %s %s\n", te->desc, te->name);
			_printTocEntry(AH, te, ropt);

			/* If we created a DB, connect to it... */
			if (strcmp(te->desc,"DATABASE") == 0)
			{
				ahlog(AH, 1, "Connecting to new DB '%s' as %s\n",te->name, te->owner);
				_reconnectAsUser(AH, te->name, te->owner);
			}
		}

		/* 
		 * If we want data, and it has data, then restore that too 
		 */
		if (AH->PrintTocDataPtr != NULL && (reqs & 2) != 0) {
#ifndef HAVE_LIBZ
			if (AH->compression != 0)
				die_horribly(AH, "%s: Unable to restore data from a compressed archive\n", progname);
#endif

			ahprintf(AH, "--\n-- Data for TOC Entry ID %d (OID %s) %s %s\n--\n\n",
						te->id, te->oid, te->desc, te->name);

			/*
			 * Maybe we can't do BLOBS, so check if this node is for BLOBS 
			 */
			if ((strcmp(te->desc,"BLOBS") == 0) && !_canRestoreBlobs(AH))
			{
				ahprintf(AH, "--\n-- SKIPPED \n--\n\n");
				/*
				 * This is a bit nasty - we assume, for the moment, that if a custom
				 * output is used, then we don't want warnings.
				 */
				if (!AH->CustomOutPtr)
					fprintf(stderr, "%s: WARNING - skipping BLOB restoration\n", progname);

			} else {

				_disableTriggers(AH, te, ropt);

				/* Reconnect if necessary (_disableTriggers may have reconnected) */
				_reconnectAsOwner(AH, "-", te);

				ahlog(AH, 1, "Restoring data for %s \n", te->name);

				/* If we have a copy statement, use it. As of V1.3, these are separate 
				 * to allow easy import from withing a database connection. Pre 1.3 
				 * archives can not use DB connections and are sent to output only.
				 *
				 * For V1.3+, the table data MUST have a copy statement so that 
				 * we can go into appropriate mode with libpq.
				 */
				if (te->copyStmt && strlen(te->copyStmt) > 0)
					ahprintf(AH, te->copyStmt);

				(*AH->PrintTocDataPtr)(AH, te, ropt);

				_enableTriggers(AH, te, ropt);
			}
		}
		te = te->next;
    }

	/*
	 * Now use blobs_xref (if used) to fixup any refs for tables that we loaded
	 */
	if (_canRestoreBlobs(AH) && AH->createdBlobXref)
	{
		/* NULL parameter means disable ALL user triggers */
		_disableTriggers(AH, NULL, ropt);

		te = AH->toc->next;
		while (te != AH->toc) {

			/* Is it table data? */
			if (strcmp(te->desc, "TABLE DATA") == 0) {

				ahlog(AH, 2, "Checking if we loaded %s\n", te->name);

				reqs = _tocEntryRequired(te, ropt);

				if ( (reqs & 2) != 0) /* We loaded the data */
				{
					ahlog(AH, 1, "Fixing up BLOB ref for %s\n", te->name);
					FixupBlobRefs(AH, te->name);
				}
			}
			else
			{
				ahlog(AH, 2, "Ignoring BLOB xrefs for %s %s\n", te->desc, te->name);
			}

			te = te->next;
		}

		/* NULL parameter means enable ALL user triggers */
		_enableTriggers(AH, NULL, ropt);
	}

	/*
	 * Clean up & we're done.
	 */
    if (ropt->filename)
		ResetOutput(AH, sav);

	if (ropt->useDB)
	{
		PQfinish(AH->connection);
		AH->connection = NULL;

		if (AH->blobConnection)
		{
			PQfinish(AH->blobConnection);
			AH->blobConnection = NULL;
		}
	}
}

/*
 * Allocate a new RestoreOptions block.
 * This is mainly so we can initialize it, but also for future expansion,
 */
RestoreOptions*		NewRestoreOptions(void)
{
	RestoreOptions* opts;

	opts = (RestoreOptions*)calloc(1, sizeof(RestoreOptions));

	opts->format = archUnknown;

	return opts;
}

static int _restoringToDB(ArchiveHandle *AH)
{
	return (AH->ropt->useDB && AH->connection);
}

static int _canRestoreBlobs(ArchiveHandle *AH)
{
	return _restoringToDB(AH);
}

static void _disableTriggers(ArchiveHandle *AH, TocEntry *te, RestoreOptions *ropt)
{
	char	*oldUser = NULL;

	/* Can't do much if we're connected & don't have a superuser */
	if (_restoringToDB(AH) && !ropt->superuser)
		return;

	/*
     * Reconnect as superuser if possible, since they are the only ones
	 * who can update pg_class...
	 */
	if (ropt->superuser)
	{
		if (!_restoringToDB(AH) || !ConnectedUserIsSuperuser(AH))
		{
			/* If we're not allowing changes for ownership, then remember the user
			 * so we can change it back here. Otherwise, let _reconnectAsOwner
			 * do what it has to do.
			 */
			if (ropt->noOwner)
				oldUser = strdup(ConnectedUser(AH));
			_reconnectAsUser(AH, "-", ropt->superuser);
		}
	}

	ahlog(AH, 1, "Disabling triggers\n");

	/*
     * Disable them. This is a hack. Needs to be done via an appropriate 'SET'
	 * command when one is available.
	 */
    ahprintf(AH, "-- Disable triggers\n");

	/*
	 * Just update the AFFECTED table, if known.
	 */

	if (te && te->name && strlen(te->name) > 0)
		ahprintf(AH, "UPDATE \"pg_class\" SET \"reltriggers\" = 0 WHERE \"relname\" ~* '%s';\n", 
						te->name);
	else
		ahprintf(AH, "UPDATE \"pg_class\" SET \"reltriggers\" = 0 WHERE \"relname\" !~ '^pg_';\n\n");

	/*
	 * Restore the user connection from the start of this procedure
	 * if _reconnectAsOwner is disabled.
	 */
	if (ropt->noOwner && oldUser)
	{
		_reconnectAsUser(AH, "-", oldUser);
		free(oldUser);
	}
}

static void _enableTriggers(ArchiveHandle *AH, TocEntry *te, RestoreOptions *ropt)
{
	char		*oldUser = NULL;

	/* Can't do much if we're connected & don't have a superuser */
	if (_restoringToDB(AH) && !ropt->superuser)
		return;

	/*
	 * Reconnect as superuser if possible, since they are the only ones
	 * who can update pg_class...
	 */
	if (ropt->superuser)
	{
		if (!_restoringToDB(AH) || !ConnectedUserIsSuperuser(AH))
		{
			/* If we're not allowing changes for ownership, then remember the user
			 * so we can change it back here. Otherwise, let _reconnectAsOwner
			 * do what it has to do
			 */
			if (ropt->noOwner)
				oldUser = strdup(ConnectedUser(AH));

			_reconnectAsUser(AH, "-", ropt->superuser);
		}
	}

	ahlog(AH, 1, "Enabling triggers\n");

	/*
	 * Enable them. This is a hack. Needs to be done via an appropriate 'SET'
	 * command when one is available.
	 */
    ahprintf(AH, "-- Enable triggers\n");
    ahprintf(AH, "BEGIN TRANSACTION;\n");
    ahprintf(AH, "CREATE TEMP TABLE \"tr\" (\"tmp_relname\" name, \"tmp_reltriggers\" smallint);\n");

	/*
	 * Just update the affected table, if known.
	 */
	if (te && te->name && strlen(te->name) > 0)
		ahprintf(AH, "INSERT INTO \"tr\" SELECT C.\"relname\", count(T.\"oid\") FROM \"pg_class\" C,"
					" \"pg_trigger\" T WHERE C.\"oid\" = T.\"tgrelid\" AND C.\"relname\" ~* '%s' "
					" GROUP BY 1;\n", te->name);
	else
		ahprintf(AH, "INSERT INTO \"tr\" SELECT C.\"relname\", count(T.\"oid\") FROM \"pg_class\" C,"
					" \"pg_trigger\" T WHERE C.\"oid\" = T.\"tgrelid\" AND C.\"relname\" !~ '^pg_' "
					" GROUP BY 1;\n");

    ahprintf(AH, "UPDATE \"pg_class\" SET \"reltriggers\" = TMP.\"tmp_reltriggers\" "
	    "FROM \"tr\" TMP WHERE "
	    "\"pg_class\".\"relname\" = TMP.\"tmp_relname\";\n");
    ahprintf(AH, "DROP TABLE \"tr\";\n");
    ahprintf(AH, "COMMIT TRANSACTION;\n\n");

	/*
	 * Restore the user connection from the start of this procedure
	 * if _reconnectAsOwner is disabled.
	 */
	if (ropt->noOwner && oldUser)
	{
		_reconnectAsUser(AH, "-", oldUser);
		free(oldUser);
	}
}

/*
 * This is a routine that is part of the dumper interface, hence the 'Archive*' parameter.
 */

/* Public */
int	WriteData(Archive* AHX, const void* data, int dLen)
{
    ArchiveHandle*      AH = (ArchiveHandle*)AHX;

	if (!AH->currToc)
		die_horribly(AH, "%s: WriteData can not be called outside the context of "
						"a DataDumper routine\n", progname);

    return (*AH->WriteDataPtr)(AH, data, dLen);
}

/*
 * Create a new TOC entry. The TOC was designed as a TOC, but is now the 
 * repository for all metadata. But the name has stuck.
 */

/* Public */
void	ArchiveEntry(Archive* AHX, const char* oid, const char* name,
			const char* desc, const char* (deps[]), const char* defn,
			const char* dropStmt, const char* copyStmt, const char* owner,
			DataDumperPtr dumpFn, void* dumpArg)
{
    ArchiveHandle*	AH = (ArchiveHandle*)AHX;
    TocEntry*		newToc;

    AH->lastID++;
    AH->tocCount++;

    newToc = (TocEntry*)calloc(1, sizeof(TocEntry));
    if (!newToc)
	die_horribly(AH, "Archiver: unable to allocate memory for TOC entry\n");

    newToc->prev = AH->toc->prev;
    newToc->next = AH->toc;
    AH->toc->prev->next = newToc;
    AH->toc->prev = newToc;

    newToc->id = AH->lastID;
    newToc->oid = strdup(oid);
    newToc->oidVal = atoi(oid);
    newToc->name = strdup(name);
    newToc->desc = strdup(desc);
    newToc->defn = strdup(defn);
    newToc->dropStmt = strdup(dropStmt);
	newToc->copyStmt = copyStmt ? strdup(copyStmt) : NULL;
    newToc->owner = strdup(owner);
    newToc->printed = 0;
    newToc->formatData = NULL;
    newToc->dataDumper = dumpFn,
    newToc->dataDumperArg = dumpArg;

    newToc->hadDumper = dumpFn ? 1 : 0;

    if (AH->ArchiveEntryPtr != NULL) {
		(*AH->ArchiveEntryPtr)(AH, newToc);
    }

    /* printf("New toc owned by '%s', oid %d\n", newToc->owner, newToc->oidVal); */
}

/* Public */
void PrintTOCSummary(Archive* AHX, RestoreOptions *ropt)
{
    ArchiveHandle*	AH = (ArchiveHandle*) AHX;
    TocEntry		*te = AH->toc->next;
    OutputContext	sav;
	char			*fmtName;

    if (ropt->filename)
	sav = SetOutput(AH, ropt->filename, ropt->compression);

	ahprintf(AH, ";\n; Archive created at %s", ctime(&AH->createDate));
	ahprintf(AH, ";     dbname: %s\n;     TOC Entries: %d\n;     Compression: %d\n",
				AH->archdbname, AH->tocCount, AH->compression);

	switch (AH->format) {
		case archFiles:
			fmtName = "FILES";
			break;
		case archCustom:
			fmtName = "CUSTOM";
			break;
		case archTar:
			fmtName = "TAR";
			break;
		default:
			fmtName = "UNKNOWN";
	}

	ahprintf(AH, ";     Dump Version: %d.%d-%d\n", AH->vmaj, AH->vmin, AH->vrev);
	ahprintf(AH, ";     Format: %s\n;\n", fmtName);

    ahprintf(AH, ";\n; Selected TOC Entries:\n;\n");

    while (te != AH->toc) {
	if (_tocEntryRequired(te, ropt) != 0)
		ahprintf(AH, "%d; %d %s %s %s\n", te->id, te->oidVal, te->desc, te->name, te->owner);
		te = te->next;
    }

    if (ropt->filename)
	ResetOutput(AH, sav);
}

/***********
 * BLOB Archival
 ***********/

/* Called by a dumper to signal start of a BLOB */
int StartBlob(Archive* AHX, int oid)
{
    ArchiveHandle* AH = (ArchiveHandle*)AHX;

    if (!AH->StartBlobPtr)
		die_horribly(AH, "%s: BLOB output not supported in chosen format\n", progname);

    (*AH->StartBlobPtr)(AH, AH->currToc, oid);

    return 1;
}

/* Called by a dumper to signal end of a BLOB */
int EndBlob(Archive* AHX, int oid)
{
    ArchiveHandle* AH = (ArchiveHandle*)AHX;

    if (AH->EndBlobPtr)
		(*AH->EndBlobPtr)(AH, AH->currToc, oid);

    return 1;
}

/**********
 * BLOB Restoration
 **********/

/*
 * Called by a format handler before any blobs are restored 
 */
void StartRestoreBlobs(ArchiveHandle* AH)
{
	AH->blobCount = 0;
}

/*
 * Called by a format handler after all blobs are restored 
 */
void EndRestoreBlobs(ArchiveHandle* AH)
{
	if (AH->txActive)
	{
		ahlog(AH, 2, "Committing BLOB transactions\n");
		CommitTransaction(AH);
	}

	if (AH->blobTxActive)
	{
		CommitTransactionXref(AH);
	}

	ahlog(AH, 1, "Restored %d BLOBs\n", AH->blobCount);
}


/*
 * Called by a format handler to initiate restoration of a blob
 */
void StartRestoreBlob(ArchiveHandle* AH, int oid)
{
	int			loOid;

	AH->blobCount++;

	if (!AH->createdBlobXref)
	{
		if (!AH->connection)
			die_horribly(AH, "%s: can not restore BLOBs without a database connection", progname);

		CreateBlobXrefTable(AH);
		AH->createdBlobXref = 1;
	}

	/*
	 * Start long-running TXs if necessary
	 */
	if (!AH->txActive)
	{
		ahlog(AH, 2, "Starting BLOB transactions\n");
		StartTransaction(AH);
	}
	if (!AH->blobTxActive)
	{
		StartTransactionXref(AH);
	}

	loOid = lo_creat(AH->connection, INV_READ | INV_WRITE);
	if (loOid == 0)
		die_horribly(AH, "%s: unable to create BLOB\n", progname);

	ahlog(AH, 2, "Restoring BLOB oid %d as %d\n", oid, loOid);

	InsertBlobXref(AH, oid, loOid);

	AH->loFd = lo_open(AH->connection, loOid, INV_WRITE);
	if (AH->loFd == -1)
		die_horribly(AH, "%s: unable to open BLOB\n", progname);

    AH->writingBlob = 1;
}

void EndRestoreBlob(ArchiveHandle* AH, int oid)
{
    lo_close(AH->connection, AH->loFd);
    AH->writingBlob = 0;

	/*
	 * Commit every BLOB_BATCH_SIZE blobs...
	 */
	if ( ((AH->blobCount / BLOB_BATCH_SIZE) * BLOB_BATCH_SIZE) == AH->blobCount) 
	{
		ahlog(AH, 2, "Committing BLOB transactions\n");
		CommitTransaction(AH);
		CommitTransactionXref(AH);
	}
}

/***********
 * Sorting and Reordering
 ***********/

/*
 * Move TOC entries of the specified type to the START of the TOC.
 */

/* Public */
void MoveToStart(Archive* AHX, char *oType) 
{
    ArchiveHandle* AH = (ArchiveHandle*)AHX;
    TocEntry	*te = AH->toc->next;
    TocEntry	*newTe;

    while (te != AH->toc) {
		te->_moved = 0;
		te = te->next;
    }

    te = AH->toc->prev;
    while (te != AH->toc && !te->_moved) {
	newTe = te->prev;
	if (strcmp(te->desc, oType) == 0) {
	    _moveAfter(AH, AH->toc, te);
	}
		te = newTe;
    }
}


/*
 * Move TOC entries of the specified type to the end of the TOC.
 */
/* Public */
void MoveToEnd(Archive* AHX, char *oType) 
{
    ArchiveHandle* AH = (ArchiveHandle*)AHX;
    TocEntry	*te = AH->toc->next;
    TocEntry	*newTe;

    while (te != AH->toc) {
	te->_moved = 0;
	te = te->next;
    }

    te = AH->toc->next;
    while (te != AH->toc && !te->_moved) {
	newTe = te->next;
	if (strcmp(te->desc, oType) == 0) {
	    _moveBefore(AH, AH->toc, te);
	}
		te = newTe;
    }
}

/* 
 * Sort TOC by OID
 */
/* Public */
void SortTocByOID(Archive* AHX)
{
    ArchiveHandle* AH = (ArchiveHandle*)AHX;
    _SortToc(AH, _tocSortCompareByOIDNum);
}

/*
 * Sort TOC by ID
 */
/* Public */
void SortTocByID(Archive* AHX)
{
    ArchiveHandle* AH = (ArchiveHandle*)AHX;
    _SortToc(AH, _tocSortCompareByIDNum);
}

void SortTocFromFile(Archive* AHX, RestoreOptions *ropt)
{
    ArchiveHandle* AH = (ArchiveHandle*)AHX;
    FILE	*fh;
    char	buf[1024];
    char	*cmnt;
    char	*endptr;
    int		id;
    TocEntry	*te;
    TocEntry	*tePrev;
    int		i;

    /* Allocate space for the 'wanted' array, and init it */
    ropt->idWanted = (int*)malloc(sizeof(int)*AH->tocCount);
    for ( i = 0 ; i < AH->tocCount ; i++ )
	ropt->idWanted[i] = 0;

    ropt->limitToList = 1;

    /* Mark all entries as 'not moved' */
    te = AH->toc->next;
    while (te != AH->toc) {
	te->_moved = 0;
	te = te->next;
    }

    /* Set prev entry as head of list */
    tePrev = AH->toc;

    /* Setup the file */
    fh = fopen(ropt->tocFile, PG_BINARY_R);
	if (!fh)
		die_horribly(AH, "%s: could not open TOC file\n", progname);

    while (fgets(buf, 1024, fh) != NULL)
    {
	/* Find a comment */
	cmnt = strchr(buf, ';');
	if (cmnt == buf)
	    continue;

	/* End string at comment */
	if (cmnt != NULL)
	    cmnt[0] = '\0';

	/* Skip if all spaces */
	if (strspn(buf, " \t") == strlen(buf))
	    continue;

	/* Get an ID */
	id = strtol(buf, &endptr, 10);
	if (endptr == buf)
	{
	    fprintf(stderr, "%s: WARNING - line ignored: %s\n", progname, buf);
	    continue;
	}

	/* Find TOC entry */
	te = _getTocEntry(AH, id);
	if (!te) 
	    die_horribly(AH, "%s: could not find entry for id %d\n",progname, id);

	ropt->idWanted[id-1] = 1;

	_moveAfter(AH, tePrev, te);
	tePrev = te;
    }

    if (fclose(fh) != 0)
		die_horribly(AH, "%s: could not close TOC file\n", progname);
}

/**********************
 * 'Convenience functions that look like standard IO functions
 * for writing data when in dump mode.
 **********************/

/* Public */
int archputs(const char *s, Archive* AH) {
    return WriteData(AH, s, strlen(s));
}

/* Public */
int archputc(const char c, Archive* AH) {
    return WriteData(AH, &c, 1);
}

/* Public */
int archprintf(Archive* AH, const char *fmt, ...)
{
    char 	*p = NULL;
    va_list 	ap;
    int		bSize = strlen(fmt) + 256;
    int		cnt = -1;

    /* This is paranoid: deal with the possibility that vsnprintf is willing to ignore trailing null */
    /* or returns > 0 even if string does not fit. It may be the case that it returns cnt = bufsize */ 
    while (cnt < 0 || cnt >= (bSize-1) )
	{
		if (p != NULL) free(p);
		bSize *= 2;
		p = (char*)malloc(bSize);
		if (p == NULL)
		{
			exit_horribly(AH, "%s: could not allocate buffer for archprintf\n", progname);
		}
		va_start(ap, fmt);
		cnt = vsnprintf(p, bSize, fmt, ap);
		va_end(ap);
    }
    WriteData(AH, p, cnt);
    free(p);
    return cnt;
}


/*******************************
 * Stuff below here should be 'private' to the archiver routines
 *******************************/

OutputContext SetOutput(ArchiveHandle* AH, char *filename, int compression)
{
    OutputContext	sav;
#ifdef HAVE_LIBZ
    char		fmode[10];
#endif
    int			fn = 0;

    /* Replace the AH output file handle */
    sav.OF = AH->OF;
    sav.gzOut = AH->gzOut;

    if (filename) {
	fn = 0;
    } else if (AH->FH) {
	fn = fileno(AH->FH);
    } else if (AH->fSpec) {
	fn = 0;
	filename = AH->fSpec;
    } else {
	fn = fileno(stdout);
    }

    /* If compression explicitly requested, use gzopen */
#ifdef HAVE_LIBZ
    if (compression != 0)
    {
		sprintf(fmode, "wb%d", compression);
		if (fn) {
			AH->OF = gzdopen(dup(fn), fmode); /* Don't use PG_BINARY_x since this is zlib */
		} else {
			AH->OF = gzopen(filename, fmode);
		}
		AH->gzOut = 1;
    } else { /* Use fopen */
#endif
		if (fn) {
			AH->OF = fdopen(dup(fn), PG_BINARY_W);
		} else {
			AH->OF = fopen(filename, PG_BINARY_W);
		}
		AH->gzOut = 0;
#ifdef HAVE_LIBZ
    }
#endif

	if (!AH->OF)
		die_horribly(AH, "%s: could not set output\n", progname);

    return sav;
}

void ResetOutput(ArchiveHandle* AH, OutputContext sav)
{
	int				res;

    if (AH->gzOut)
		res = GZCLOSE(AH->OF);
    else
		res = fclose(AH->OF);

	if (res != 0)
		die_horribly(AH, "%s: could not reset the output file\n", progname);

    AH->gzOut = sav.gzOut;
    AH->OF = sav.OF;
}



/*
 *  Print formatted text to the output file (usually stdout).
 */
int ahprintf(ArchiveHandle* AH, const char *fmt, ...)
{
    char 	*p = NULL;
    va_list 	ap;
    int		bSize = strlen(fmt) + 256; /* Should be enough */
    int		cnt = -1;

    /* This is paranoid: deal with the possibility that vsnprintf is willing to ignore trailing null */
    /* or returns > 0 even if string does not fit. It may be the case that it returns cnt = bufsize */ 
    while (cnt < 0 || cnt >= (bSize - 1) )
	{
		if (p != NULL) free(p);
		bSize *= 2;
		p = (char*)malloc(bSize);
		if (p == NULL)
		{
			die_horribly(AH, "%s: could not allocate buffer for ahprintf\n", progname);
		}
		va_start(ap, fmt);
		cnt = vsnprintf(p, bSize, fmt, ap);
		va_end(ap);
    }
    ahwrite(p, 1, cnt, AH);
    free(p);
    return cnt;
}

void ahlog(ArchiveHandle* AH, int level, const char *fmt, ...)
{
	va_list		ap;

	if (AH->debugLevel < level && (!AH->public.verbose || level > 1))
		return;

	va_start(ap, fmt);
	vfprintf(stderr, fmt, ap);
	va_end(ap);
}

/*
 * Single place for logic which says 'We are restoring to a direct DB connection'.
 */
int RestoringToDB(ArchiveHandle* AH)
{
	return (AH->ropt && AH->ropt->useDB && AH->connection);
}

/*
 *  Write buffer to the output file (usually stdout). This is user for
 *  outputting 'restore' scripts etc. It is even possible for an archive
 * 	format to create a custom output routine to 'fake' a restore if it
 *	wants to generate a script (see TAR output).
 */
int ahwrite(const void *ptr, size_t size, size_t nmemb, ArchiveHandle* AH)
{
	int		res;

    if (AH->writingBlob)
	{
		res = lo_write(AH->connection, AH->loFd, (void*)ptr, size * nmemb);
		ahlog(AH, 5, "Wrote %d bytes of BLOB data (result = %d)\n", size * nmemb, res);
		if (res < size * nmemb)
			die_horribly(AH, "%s: could not write to large object (result = %d, expected %d)\n", 
							progname, res, size * nmemb);

		return res;
	}
    else if (AH->gzOut)
	{
		res = GZWRITE((void*)ptr, size, nmemb, AH->OF);
		if (res != (nmemb * size))
			die_horribly(AH, "%s: could not write to archive\n", progname);
		return res;
	}
    else if (AH->CustomOutPtr)
	{
		res = AH->CustomOutPtr(AH, ptr, size * nmemb);
		if (res != (nmemb * size))
			die_horribly(AH, "%s: could not write to custom output routine\n", progname);
		return res;
	}
	else
	{
		/*
		 * If we're doing a restore, and it's direct to DB, and we're connected
	     * then send it to the DB.
		 */	
		if (RestoringToDB(AH))
			return ExecuteSqlCommandBuf(AH, (void*)ptr, size*nmemb); /* Always 1, currently */
		else
		{
			res = fwrite((void*)ptr, size, nmemb, AH->OF);
			if (res != nmemb)
				die_horribly(AH, "%s: could not write to output file (%d != %d)\n", progname, res, nmemb);
			return res;
		}
	}
}		

/* Common exit code */
static void _die_horribly(ArchiveHandle *AH, const char *fmt, va_list ap)
{
    vfprintf(stderr, fmt, ap);

    if (AH)
	if (AH->connection)
	    PQfinish(AH->connection);
	if (AH->blobConnection)
		PQfinish(AH->blobConnection);

    exit(1);
}

/* External use */
void exit_horribly(Archive *AH, const char *fmt, ...)
{
    va_list     ap;

    va_start(ap, fmt);
    _die_horribly((ArchiveHandle*)AH, fmt, ap);
}

/* Archiver use (just different arg declaration) */
void die_horribly(ArchiveHandle *AH, const char *fmt, ...)
{
    va_list 	ap;

    va_start(ap, fmt);
    _die_horribly(AH, fmt, ap);
}


static void _moveAfter(ArchiveHandle* AH, TocEntry* pos, TocEntry* te)
{
    te->prev->next = te->next;
    te->next->prev = te->prev;

    te->prev = pos;
    te->next = pos->next;

    pos->next->prev = te;
    pos->next = te;

    te->_moved = 1;
}

static void _moveBefore(ArchiveHandle* AH, TocEntry* pos, TocEntry* te)
{
    te->prev->next = te->next;
    te->next->prev = te->prev;

    te->prev = pos->prev;
    te->next = pos;
    pos->prev->next = te;
    pos->prev = te;

    te->_moved = 1;
}

static TocEntry* _getTocEntry(ArchiveHandle* AH, int id)
{
    TocEntry    *te;

    te = AH->toc->next;
    while (te != AH->toc) {
	if (te->id == id)
	    return te;
	te = te->next;
    }
    return NULL;
}

int	TocIDRequired(ArchiveHandle* AH, int id, RestoreOptions *ropt)
{
    TocEntry	*te = _getTocEntry(AH, id);

    if (!te)
	return 0;

    return _tocEntryRequired(te, ropt);
}

int	WriteInt(ArchiveHandle* AH, int i)
{
    int b;

    /* This is a bit yucky, but I don't want to make the 
     * binary format very dependant on representation,	    
     * and not knowing much about it, I write out a 
     * sign byte. If you change this, don't forget to change the
     * file version #, and modify readInt to read the new format
     * AS WELL AS the old formats.
     */ 

    /* SIGN byte */
    if (i < 0) {
	(*AH->WriteBytePtr)(AH, 1);
		i = -i;
    } else {
		(*AH->WriteBytePtr)(AH, 0);
    }
    
    for(b = 0 ; b < AH->intSize ; b++) {
        (*AH->WriteBytePtr)(AH, i & 0xFF);
        i = i / 256;
    }

    return AH->intSize + 1;
}

int    	ReadInt(ArchiveHandle* AH)
{
    int res = 0;
    int bv, b;
    int	sign = 0; /* Default positive */
	int bitShift = 0;

    if (AH->version > K_VERS_1_0)
		/* Read a sign byte */
		sign = (*AH->ReadBytePtr)(AH);

    for( b = 0 ; b < AH->intSize ; b++) {
        bv = (*AH->ReadBytePtr)(AH) & 0xFF;
		if (bv != 0)
			res = res + (bv << bitShift);
		bitShift += 8;
    }

    if (sign)
		res = - res;

    return res;
}

int	WriteStr(ArchiveHandle* AH, char* c)
{
    int res;

	if (c)
	{
		res = WriteInt(AH, strlen(c));
		res += (*AH->WriteBufPtr)(AH, c, strlen(c));
	}
	else
		res = WriteInt(AH, -1);

    return res;
}

char*	ReadStr(ArchiveHandle* AH)
{
    char*	buf;
    int		l;

    l = ReadInt(AH);
	if (l == -1)
		buf = NULL;
	else
	{
		buf = (char*)malloc(l+1);
		if (!buf)
			die_horribly(AH, "%s: Unable to allocate sufficient memory in ReadStr - "													"requested %d (0x%x) bytes\n", progname, l, l);

		(*AH->ReadBufPtr)(AH, (void*)buf, l);
		buf[l] = '\0';
	}

    return buf;
}

static int
_discoverArchiveFormat(ArchiveHandle* AH)
{
    FILE	*fh;
    char	sig[6]; /* More than enough */
    int		cnt;
    int		wantClose = 0;

	/*
	 * fprintf(stderr, "%s: Attempting to ascertain archive format\n", progname);
	 */

	if (AH->lookahead)
		free(AH->lookahead);

	AH->lookaheadSize = 512;
	AH->lookahead = calloc(1, 512);
	AH->lookaheadLen = 0;
	AH->lookaheadPos = 0;

    if (AH->fSpec) {
		wantClose = 1;
		fh = fopen(AH->fSpec, PG_BINARY_R);
    } else {
		fh = stdin;
    }

    if (!fh)
		die_horribly(AH, "Archiver: could not open input file\n");

    cnt = fread(sig, 1, 5, fh);

    if (cnt != 5)
        die_horribly(AH, "%s: input file is too short, or is unreadable\n", progname);

	/* Save it, just in case we need it later*/
	strncpy(&AH->lookahead[0], sig, 5);
	AH->lookaheadLen = 5;

    if (strncmp(sig, "PGDMP", 5) == 0)
	{
		AH->vmaj = fgetc(fh);
		AH->vmin = fgetc(fh);

		/* Save these too... */
		AH->lookahead[AH->lookaheadLen++] = AH->vmaj;
		AH->lookahead[AH->lookaheadLen++] = AH->vmin;

		/* Check header version; varies from V1.0 */
		if (AH->vmaj > 1 || ( (AH->vmaj == 1) && (AH->vmin > 0) ) ) /* Version > 1.0 */
		{	
			AH->vrev = fgetc(fh);
			AH->lookahead[AH->lookaheadLen++] = AH->vrev;
		}
		else
			AH->vrev = 0;

		AH->intSize = fgetc(fh);
		AH->lookahead[AH->lookaheadLen++] = AH->intSize;

		AH->format = fgetc(fh);
		AH->lookahead[AH->lookaheadLen++] = AH->format;

		/* Make a convenient integer <maj><min><rev>00 */
		AH->version = ( (AH->vmaj * 256 + AH->vmin) * 256 + AH->vrev ) * 256 + 0;
	} else {
		/*
		 * *Maybe* we have a tar archive format file...
		 * So, read first 512 byte header...
		 */
		cnt = fread(&AH->lookahead[AH->lookaheadLen], 1, 512 - AH->lookaheadLen, fh);
		AH->lookaheadLen += cnt;

		if (AH->lookaheadLen != 512)
			die_horribly(AH, "%s: input file does not appear to be a valid archive (too short?)\n",
							progname);

		if (!isValidTarHeader(AH->lookahead))
			die_horribly(AH, "%s: input file does not appear to be a valid archive\n", progname);

		AH->format = archTar;
	}

    /* If we can't seek, then mark the header as read */
    if (fseek(fh, 0, SEEK_SET) != 0) 
	{
		/*
		 * NOTE: Formats that use the looahead buffer can unset this in their Init routine.
		 */
		AH->readHeader = 1;
	}
	else
		AH->lookaheadLen = 0; /* Don't bother since we've reset the file */

	/*
	 *fprintf(stderr, "%s: read %d bytes into lookahead buffer\n", progname, AH->lookaheadLen);
	 */

    /* Close the file */
    if (wantClose)
		if (fclose(fh) != 0)
			die_horribly(AH, "%s: could not close the input file after reading header\n", progname);

    return AH->format;
}


/*
 * Allocate an archive handle
 */
static ArchiveHandle* _allocAH(const char* FileSpec, const ArchiveFormat fmt, 
				const int compression, ArchiveMode mode) 
{
    ArchiveHandle*	AH;

	/*
	 *fprintf(stderr, "%s: allocating AH for %s, format %d\n", progname, FileSpec, fmt); 
	 */

    AH = (ArchiveHandle*)calloc(1, sizeof(ArchiveHandle));
    if (!AH) 
		die_horribly(AH, "Archiver: Could not allocate archive handle\n");

    AH->vmaj = K_VERS_MAJOR;
    AH->vmin = K_VERS_MINOR;
	AH->vrev = K_VERS_REV;

	AH->createDate = time(NULL);

    AH->intSize = sizeof(int);
    AH->lastID = 0;
    if (FileSpec) {
		AH->fSpec = strdup(FileSpec);
		/*
		 * Not used; maybe later....
		 *
		 * AH->workDir = strdup(FileSpec);
		 * for(i=strlen(FileSpec) ; i > 0 ; i--)
		 *   if (AH->workDir[i-1] == '/')
		 */
    } else {
		AH->fSpec = NULL;
    } 

    AH->currUser = strdup(""); /* So it's valid, but we can free() it later if necessary */ 

    AH->toc = (TocEntry*)calloc(1, sizeof(TocEntry));
    if (!AH->toc)
		die_horribly(AH, "Archiver: Could not allocate TOC header\n");

    AH->toc->next = AH->toc;
    AH->toc->prev = AH->toc;
    
    AH->mode = mode;
    AH->compression = compression;

	AH->pgCopyBuf = createPQExpBuffer();
	AH->sqlBuf = createPQExpBuffer();

    /* Open stdout with no compression for AH output handle */
    AH->gzOut = 0;
    AH->OF = stdout;

	/*
	 *fprintf(stderr, "%s: archive format is %d\n", progname, fmt);
	 */

    if (fmt == archUnknown)
		AH->format = _discoverArchiveFormat(AH);
	else
		AH->format = fmt;

    switch (AH->format) {

		case archCustom:
			InitArchiveFmt_Custom(AH);
			break;

		case archFiles:
			InitArchiveFmt_Files(AH);
			break;

		case archNull:
			InitArchiveFmt_Null(AH);
			break;

		case archTar:
			InitArchiveFmt_Tar(AH);
			break;

		default:
			die_horribly(AH, "Archiver: Unrecognized file format '%d'\n", fmt);
    }

    return AH;
}


void WriteDataChunks(ArchiveHandle* AH)
{
    TocEntry		*te = AH->toc->next;
	StartDataPtr	startPtr;
	EndDataPtr		endPtr;

    while (te != AH->toc) {
	if (te->dataDumper != NULL) {
	    AH->currToc = te;
	    /* printf("Writing data for %d (%x)\n", te->id, te); */

		if (strcmp(te->desc, "BLOBS") == 0)
		{
			startPtr = AH->StartBlobsPtr;
			endPtr = AH->EndBlobsPtr;
		} else {
			startPtr = AH->StartDataPtr;
			endPtr = AH->EndDataPtr;
		}

	    if (startPtr != NULL) {
			(*startPtr)(AH, te);
	    }

	    /* printf("Dumper arg for %d is %x\n", te->id, te->dataDumperArg); */
	    /*
	     * The user-provided DataDumper routine needs to call AH->WriteData
	     */
	    (*te->dataDumper)((Archive*)AH, te->oid, te->dataDumperArg);

	    if (endPtr != NULL) {
			(*endPtr)(AH, te);
	    }
	    AH->currToc = NULL;
	}
		te = te->next;
    }
}

void WriteToc(ArchiveHandle* AH)
{
    TocEntry	*te = AH->toc->next;

    /* printf("%d TOC Entries to save\n", AH->tocCount); */

    WriteInt(AH, AH->tocCount);
    while (te != AH->toc) {
	WriteInt(AH, te->id);
	WriteInt(AH, te->dataDumper ? 1 : 0);
	WriteStr(AH, te->oid);
	WriteStr(AH, te->name);
	WriteStr(AH, te->desc);
	WriteStr(AH, te->defn);
	WriteStr(AH, te->dropStmt);
	WriteStr(AH, te->copyStmt);
	WriteStr(AH, te->owner);
	if (AH->WriteExtraTocPtr) {
	    (*AH->WriteExtraTocPtr)(AH, te);
	}
		te = te->next;
    }
}

void ReadToc(ArchiveHandle* AH)
{
    int 		i;

    TocEntry	*te = AH->toc->next;

    AH->tocCount = ReadInt(AH);

    for( i = 0 ; i < AH->tocCount ; i++) {

		te = (TocEntry*)calloc(1, sizeof(TocEntry));
		te->id = ReadInt(AH);

		/* Sanity check */
		if (te->id <= 0 || te->id > AH->tocCount)
			die_horribly(AH, "Archiver: failed sanity check (bad entry id) - perhaps a corrupt TOC\n");

		te->hadDumper = ReadInt(AH);
		te->oid = ReadStr(AH);
		te->oidVal = atoi(te->oid);
		te->name = ReadStr(AH);
		te->desc = ReadStr(AH);
		te->defn = ReadStr(AH);
		te->dropStmt = ReadStr(AH);

		if (AH->version >= K_VERS_1_3)
			te->copyStmt = ReadStr(AH);

		te->owner = ReadStr(AH);

		if (AH->ReadExtraTocPtr) {
			(*AH->ReadExtraTocPtr)(AH, te);
		}

		ahlog(AH, 3, "Read TOC entry %d (id %d) for %s %s\n", i, te->id, te->desc, te->name);

		te->prev = AH->toc->prev;
		AH->toc->prev->next = te;
		AH->toc->prev = te;
		te->next = AH->toc;
    }
}

static int _tocEntryRequired(TocEntry* te, RestoreOptions *ropt)
{
    int res = 3; /* Schema = 1, Data = 2, Both = 3 */
 
    /* If it's an ACL, maybe ignore it */
    if (ropt->aclsSkip && strcmp(te->desc,"ACL") == 0)
		return 0;

	if (!ropt->create && strcmp(te->desc,"DATABASE") == 0)
		return 0;

    /* Check if tablename only is wanted */
    if (ropt->selTypes)
    {
		if ( (strcmp(te->desc, "TABLE") == 0) || (strcmp(te->desc, "TABLE DATA") == 0) )
		{
			if (!ropt->selTable)
				return 0;
			if (ropt->tableNames && strcmp(ropt->tableNames, te->name) != 0)
				return 0;
		} else if (strcmp(te->desc, "INDEX") == 0) {
			if (!ropt->selIndex)
				return 0;
			if (ropt->indexNames && strcmp(ropt->indexNames, te->name) != 0)
				return 0;
		} else if (strcmp(te->desc, "FUNCTION") == 0) {
			if (!ropt->selFunction)
				return 0;
			if (ropt->functionNames && strcmp(ropt->functionNames, te->name) != 0)
				return 0;
		} else if (strcmp(te->desc, "TRIGGER") == 0) {
			if (!ropt->selTrigger)
				return 0;
			if (ropt->triggerNames && strcmp(ropt->triggerNames, te->name) != 0)
				return 0;
		} else {
			return 0;
		}
	}

	/* Special Case: If 'SEQUENCE SET' and schemaOnly, then not needed */
	if (ropt->schemaOnly && (strcmp(te->desc, "SEQUENCE SET") == 0) )
		return 0;

    /* Mask it if we only want schema */
    if (ropt->schemaOnly)
		res = res & 1;

    /* Mask it we only want data */
    if (ropt->dataOnly && (strcmp(te->desc, "SEQUENCE SET") != 0) ) 
       res = res & 2;

    /* Mask it if we don't have a schema contribition */
    if (!te->defn || strlen(te->defn) == 0) 
		res = res & 2;

    /* Mask it if we don't have a possible data contribition */
    if (!te->hadDumper)
		res = res & 1;

    /* Finally, if we used a list, limit based on that as well */
    if (ropt->limitToList && !ropt->idWanted[te->id - 1]) 
		return 0;

    return res;
}

static void _reconnectAsUser(ArchiveHandle* AH, const char *dbname, char *user)
{
	if (AH->ropt && AH->ropt->noReconnect)
		return;

	if (user && strlen(user) != 0
			&& ( (strcmp(AH->currUser, user) != 0) || (strcmp(dbname,"-") != 0)))
	{
		if (RestoringToDB(AH))
		{
			ReconnectDatabase(AH, dbname, user);
		}
		else
		{
			ahprintf(AH, "\\connect %s %s\n", dbname, user);
		}
		if (AH->currUser) 
		{
			free(AH->currUser);
		}

		AH->currUser = strdup(user);
    } 
}

static void _reconnectAsOwner(ArchiveHandle* AH, const char *dbname, TocEntry* te) 
{
	if (AH->ropt && AH->ropt->noOwner)
		return;

	_reconnectAsUser(AH, dbname, te->owner);
}

static int _printTocEntry(ArchiveHandle* AH, TocEntry* te, RestoreOptions *ropt) 
{
    ahprintf(AH, "--\n-- TOC Entry ID %d (OID %s)\n--\n-- Name: %s Type: %s Owner: %s\n",
	    te->id, te->oid, te->name, te->desc, te->owner);
    if (AH->PrintExtraTocPtr != NULL) {
		(*AH->PrintExtraTocPtr)(AH, te);
    }
    ahprintf(AH, "--\n\n");

	ahprintf(AH, "%s\n", te->defn);

    return 1;
}

void WriteHead(ArchiveHandle* AH) 
{
	struct tm		crtm;

    (*AH->WriteBufPtr)(AH, "PGDMP", 5); 	/* Magic code */
    (*AH->WriteBytePtr)(AH, AH->vmaj);
    (*AH->WriteBytePtr)(AH, AH->vmin);
    (*AH->WriteBytePtr)(AH, AH->vrev);
    (*AH->WriteBytePtr)(AH, AH->intSize);
    (*AH->WriteBytePtr)(AH, AH->format);

#ifndef HAVE_LIBZ
    if (AH->compression != 0)
	fprintf(stderr, "%s: WARNING - requested compression not available in this installation - "
		    "archive will be uncompressed \n", progname);

    AH->compression = 0;

#endif

	WriteInt(AH, AH->compression);

	crtm = *localtime(&AH->createDate);
	WriteInt(AH, crtm.tm_sec);
	WriteInt(AH, crtm.tm_min);
	WriteInt(AH, crtm.tm_hour);
	WriteInt(AH, crtm.tm_mday);
	WriteInt(AH, crtm.tm_mon);
	WriteInt(AH, crtm.tm_year);
	WriteInt(AH, crtm.tm_isdst);
	WriteStr(AH, AH->dbname);	
}

void ReadHead(ArchiveHandle* AH)
{
    char		tmpMag[7];
    int			fmt;
	struct tm	crtm;

	/* If we haven't already read the header... */
    if (!AH->readHeader) {

		(*AH->ReadBufPtr)(AH, tmpMag, 5);

		if (strncmp(tmpMag,"PGDMP", 5) != 0)
			die_horribly(AH, "Archiver: Did not fing magic PGDMP in file header\n");

		AH->vmaj = (*AH->ReadBytePtr)(AH);
		AH->vmin = (*AH->ReadBytePtr)(AH);

		if (AH->vmaj > 1 || ( (AH->vmaj == 1) && (AH->vmin > 0) ) ) /* Version > 1.0 */
		{
			AH->vrev = (*AH->ReadBytePtr)(AH);
		} else {
			AH->vrev = 0;
		}

		AH->version = ( (AH->vmaj * 256 + AH->vmin) * 256 + AH->vrev ) * 256 + 0;


		if (AH->version < K_VERS_1_0 || AH->version > K_VERS_MAX)
			die_horribly(AH, "%s: unsupported version (%d.%d) in file header\n", 
					progname, AH->vmaj, AH->vmin);

		AH->intSize = (*AH->ReadBytePtr)(AH);
		if (AH->intSize > 32)
			die_horribly(AH, "Archiver: sanity check on integer size (%d) failes\n", AH->intSize);

		if (AH->intSize > sizeof(int))
			fprintf(stderr, "\n%s: WARNING - archive was made on a machine with larger integers, "
					"some operations may fail\n", progname);

		fmt = (*AH->ReadBytePtr)(AH);

		if (AH->format != fmt)
			die_horribly(AH, "%s: expected format (%d) differs from format found in file (%d)\n", 
					progname, AH->format, fmt);
    }

    if (AH->version >= K_VERS_1_2)
    {
		if (AH->version < K_VERS_1_4)
			AH->compression = (*AH->ReadBytePtr)(AH);
		else
			AH->compression = ReadInt(AH);
    } else {
		AH->compression = Z_DEFAULT_COMPRESSION;
    }

#ifndef HAVE_LIBZ
    if (AH->compression != 0)
		fprintf(stderr, "%s: WARNING - archive is compressed - any data will not be available\n", 
					progname);
#endif

	if (AH->version >= K_VERS_1_4)
	{
		crtm.tm_sec = ReadInt(AH);
		crtm.tm_min = ReadInt(AH);
		crtm.tm_hour = ReadInt(AH);
		crtm.tm_mday = ReadInt(AH);
		crtm.tm_mon = ReadInt(AH);
		crtm.tm_year = ReadInt(AH);
		crtm.tm_isdst = ReadInt(AH);

		AH->archdbname = ReadStr(AH);

		AH->createDate = mktime(&crtm);

		if (AH->createDate == (time_t)-1)
			fprintf(stderr, "%s: WARNING - bad creation date in header\n", progname);
	}

}


static void _SortToc(ArchiveHandle* AH, TocSortCompareFn fn)
{
    TocEntry**	tea;
    TocEntry*	te;
    int		i;

    /* Allocate an array for quicksort (TOC size + head & foot) */
    tea = (TocEntry**)malloc(sizeof(TocEntry*) * (AH->tocCount + 2) );

    /* Build array of toc entries, including header at start and end */
    te = AH->toc;
    for( i = 0 ; i <= AH->tocCount+1 ; i++) {
	/* printf("%d: %x (%x, %x) - %d\n", i, te, te->prev, te->next, te->oidVal); */
	tea[i] = te;
	te = te->next;
    }

    /* Sort it, but ignore the header entries */
    qsort(&(tea[1]), AH->tocCount, sizeof(TocEntry*), fn);

    /* Rebuild list: this works becuase we have headers at each end */
    for( i = 1 ; i <= AH->tocCount ; i++) {
	tea[i]->next = tea[i+1];
	tea[i]->prev = tea[i-1];
    }


    te = AH->toc;
    for( i = 0 ; i <= AH->tocCount+1 ; i++) {
	/* printf("%d: %x (%x, %x) - %d\n", i, te, te->prev, te->next, te->oidVal); */
	te = te->next;
    }


    AH->toc->next = tea[1];
    AH->toc->prev = tea[AH->tocCount];
}

static int	_tocSortCompareByOIDNum(const void* p1, const void* p2)
{
    TocEntry*	te1 = *(TocEntry**)p1;
    TocEntry*	te2 = *(TocEntry**)p2;
    int		id1 = te1->oidVal;
    int 	id2 = te2->oidVal;

    /* printf("Comparing %d to %d\n", id1, id2); */

    if (id1 < id2) {
	return -1;
    } else if (id1 > id2) { 
	return 1;
    } else {
	return _tocSortCompareByIDNum(te1, te2);
    }
}

static int	_tocSortCompareByIDNum(const void* p1, const void* p2)
{
    TocEntry*	te1 = *(TocEntry**)p1;
    TocEntry*	te2 = *(TocEntry**)p2;
    int		id1 = te1->id;
    int 	id2 = te2->id;

    /* printf("Comparing %d to %d\n", id1, id2); */

    if (id1 < id2) {
	return -1;
    } else if (id1 > id2) { 
	return 1;
    } else {
	return 0;
    }
}

/*
 * Maybe I can use this somewhere...
 *
 *create table pgdump_blob_path(p text);
 *insert into pgdump_blob_path values('/home/pjw/work/postgresql-cvs/pgsql/src/bin/pg_dump_140');
 *
 *insert into dump_blob_xref select 12345,lo_import(p || '/q.q') from pgdump_blob_path;
 */