[apt.git] / ftparchive / cachedb.cc

// -*- mode: cpp; mode: fold -*-
// Description								/*{{{*/
// $Id: cachedb.cc,v 1.7 2004/05/08 19:41:01 mdz Exp $
/* ######################################################################

   CacheDB
   
   Simple uniform interface to a cache database.
   
   ##################################################################### */
									/*}}}*/
// Include Files							/*{{{*/
#include <config.h>

#include <apt-pkg/error.h>
#include <apt-pkg/md5.h>
#include <apt-pkg/sha1.h>
#include <apt-pkg/sha2.h>
#include <apt-pkg/strutl.h>
#include <apt-pkg/configuration.h>
#include <apt-pkg/fileutl.h>
    
#include <netinet/in.h>       // htonl, etc

#include <apti18n.h>
#include "cachedb.h"
									/*}}}*/

// CacheDB::ReadyDB - Ready the DB2					/*{{{*/
// ---------------------------------------------------------------------
/* This opens the DB2 file for caching package information */
bool CacheDB::ReadyDB(std::string const &DB)
{
   int err;

   ReadOnly = _config->FindB("APT::FTPArchive::ReadOnlyDB",false);
   
   // Close the old DB
   if (Dbp != 0) 
      Dbp->close(Dbp,0);
   
   /* Check if the DB was disabled while running and deal with a 
      corrupted DB */
   if (DBFailed() == true)
   {
      _error->Warning(_("DB was corrupted, file renamed to %s.old"),DBFile.c_str());
      rename(DBFile.c_str(),(DBFile+".old").c_str());
   }
   
   DBLoaded = false;
   Dbp = 0;
   DBFile = std::string();
   
   if (DB.empty())
      return true;

   db_create(&Dbp, NULL, 0);
   if ((err = Dbp->open(Dbp, NULL, DB.c_str(), NULL, DB_BTREE,
                        (ReadOnly?DB_RDONLY:DB_CREATE),
                        0644)) != 0)
   {
      if (err == DB_OLD_VERSION)
      {
          _error->Warning(_("DB is old, attempting to upgrade %s"),DBFile.c_str());
	  err = Dbp->upgrade(Dbp, DB.c_str(), 0);
	  if (!err)
	     err = Dbp->open(Dbp, NULL, DB.c_str(), NULL, DB_HASH,
                            (ReadOnly?DB_RDONLY:DB_CREATE), 0644);

      }
      // the database format has changed from DB_HASH to DB_BTREE in 
      // apt 0.6.44
      if (err == EINVAL)
      {
	 _error->Error(_("DB format is invalid. If you upgraded from an older version of apt, please remove and re-create the database."));
      }
      if (err)
      {
          Dbp = 0;
          return _error->Error(_("Unable to open DB file %s: %s"),DB.c_str(), db_strerror(err));
      }
   }
   
   DBFile = DB;
   DBLoaded = true;
   return true;
}
									/*}}}*/
// CacheDB::OpenFile - Open the file					/*{{{*/
// ---------------------------------------------------------------------
/* */
bool CacheDB::OpenFile()
{
	Fd = new FileFd(FileName,FileFd::ReadOnly);
	if (_error->PendingError() == true)
	{
		delete Fd;
		Fd = NULL;
		return false;
	}
	return true;
}
									/*}}}*/
// CacheDB::GetFileStat - Get stats from the file 			/*{{{*/
// ---------------------------------------------------------------------
/* This gets the size from the database if it's there.  If we need
 * to look at the file, also get the mtime from the file. */
bool CacheDB::GetFileStat(bool const &doStat)
{
	if ((CurStat.Flags & FlSize) == FlSize && doStat == false)
	{
		/* Already worked out the file size */
	}
	else
	{
		/* Get it from the file. */
		if (Fd == NULL && OpenFile() == false)
		{
			return false;
		}
		// Stat the file
		struct stat St;
		if (fstat(Fd->Fd(),&St) != 0)
		{
			return _error->Errno("fstat",
				_("Failed to stat %s"),FileName.c_str());
		}
		CurStat.FileSize = St.st_size;
		CurStat.mtime = htonl(St.st_mtime);
		CurStat.Flags |= FlSize;
	}
	return true;
}
									/*}}}*/
// CacheDB::GetCurStat - Set the CurStat variable.			/*{{{*/
// ---------------------------------------------------------------------
/* Sets the CurStat variable.  Either to 0 if no database is used
 * or to the value in the database if one is used */
bool CacheDB::GetCurStat()
{
   memset(&CurStat,0,sizeof(CurStat));
   
	if (DBLoaded)
	{
		/* First see if there is anything about it
		   in the database */

		/* Get the flags (and mtime) */
   InitQuery("st");
   // Ensure alignment of the returned structure
   Data.data = &CurStat;
   Data.ulen = sizeof(CurStat);
   Data.flags = DB_DBT_USERMEM;
		if (Get() == false)
      {
	 CurStat.Flags = 0;
      }      
		CurStat.Flags = ntohl(CurStat.Flags);
		CurStat.FileSize = ntohl(CurStat.FileSize);
   }      
	return true;
}
									/*}}}*/
// CacheDB::GetFileInfo - Get all the info about the file		/*{{{*/
// ---------------------------------------------------------------------
bool CacheDB::GetFileInfo(std::string const &FileName, bool const &DoControl, bool const &DoContents,
				bool const &GenContentsOnly, bool const &DoMD5, bool const &DoSHA1,
				bool const &DoSHA256, 	bool const &DoSHA512, 
                          bool const &checkMtime)
{
	this->FileName = FileName;

	if (GetCurStat() == false)
   {
		return false;
   }   
   OldStat = CurStat;

	if (GetFileStat(checkMtime) == false)
	{
		delete Fd;
		Fd = NULL;
		return false;	
	}

    /* if mtime changed, update CurStat from disk */
    if (checkMtime == true && OldStat.mtime != CurStat.mtime)
        CurStat.Flags = FlSize;

	Stats.Bytes += CurStat.FileSize;
	Stats.Packages++;

	if ((DoControl && LoadControl() == false)
		|| (DoContents && LoadContents(GenContentsOnly) == false)
		|| (DoMD5 && GetMD5(false) == false)
		|| (DoSHA1 && GetSHA1(false) == false)
		|| (DoSHA256 && GetSHA256(false) == false)
		|| (DoSHA512 && GetSHA512(false) == false)
           )
	{
		delete Fd;
		Fd = NULL;
		delete DebFile;
		DebFile = NULL;
		return false;	
	}

	delete Fd;
	Fd = NULL;
	delete DebFile;
	DebFile = NULL;

   return true;
}
									/*}}}*/
// CacheDB::LoadControl - Load Control information			/*{{{*/
// ---------------------------------------------------------------------
/* */
bool CacheDB::LoadControl()
{
   // Try to read the control information out of the DB.
   if ((CurStat.Flags & FlControl) == FlControl)
   {
      // Lookup the control information
      InitQuery("cl");
      if (Get() == true && Control.TakeControl(Data.data,Data.size) == true)
	    return true;
      CurStat.Flags &= ~FlControl;
   }
   
   if (Fd == NULL && OpenFile() == false)
   {
      return false;
   }
   // Create a deb instance to read the archive
   if (DebFile == 0)
   {
      DebFile = new debDebFile(*Fd);
      if (_error->PendingError() == true)
	 return false;
   }
   
   Stats.Misses++;
   if (Control.Read(*DebFile) == false)
      return false;

   if (Control.Control == 0)
      return _error->Error(_("Archive has no control record"));
   
   // Write back the control information
   InitQuery("cl");
   if (Put(Control.Control,Control.Length) == true)
      CurStat.Flags |= FlControl;
   return true;
}
									/*}}}*/
// CacheDB::LoadContents - Load the File Listing			/*{{{*/
// ---------------------------------------------------------------------
/* */
bool CacheDB::LoadContents(bool const &GenOnly)
{
   // Try to read the control information out of the DB.
   if ((CurStat.Flags & FlContents) == FlContents)
   {
      if (GenOnly == true)
	 return true;
      
      // Lookup the contents information
      InitQuery("cn");
      if (Get() == true)
      {
	 if (Contents.TakeContents(Data.data,Data.size) == true)
	    return true;
      }
      
      CurStat.Flags &= ~FlContents;
   }
   
   if (Fd == NULL && OpenFile() == false)
   {
      return false;
   }
   // Create a deb instance to read the archive
   if (DebFile == 0)
   {
      DebFile = new debDebFile(*Fd);
      if (_error->PendingError() == true)
	 return false;
   }

   if (Contents.Read(*DebFile) == false)
      return false;	    
   
   // Write back the control information
   InitQuery("cn");
   if (Put(Contents.Data,Contents.CurSize) == true)
      CurStat.Flags |= FlContents;
   return true;
}
									/*}}}*/

static std::string bytes2hex(uint8_t *bytes, size_t length) {
   char buf[3];
   std::string space;

   space.reserve(length*2 + 1);
   for (size_t i = 0; i < length; i++) {
      snprintf(buf, sizeof(buf), "%02x", bytes[i]);
      space.append(buf);
   }
   return space;
}

static inline unsigned char xdig2num(char const &dig) {
   if (isdigit(dig)) return dig - '0';
   if ('a' <= dig && dig <= 'f') return dig - 'a' + 10;
   if ('A' <= dig && dig <= 'F') return dig - 'A' + 10;
   return 0;
}

static void hex2bytes(uint8_t *bytes, const char *hex, int length) {
   while (length-- > 0) {
      *bytes = 0;
      if (isxdigit(hex[0]) && isxdigit(hex[1])) {
	  *bytes = xdig2num(hex[0]) * 16 + xdig2num(hex[1]);
	  hex += 2;
      }
      bytes++;
   } 
}

// CacheDB::GetMD5 - Get the MD5 hash					/*{{{*/
// ---------------------------------------------------------------------
/* */
bool CacheDB::GetMD5(bool const &GenOnly)
{
   // Try to read the control information out of the DB.
   if ((CurStat.Flags & FlMD5) == FlMD5)
   {
      if (GenOnly == true)
	 return true;
      
      MD5Res = bytes2hex(CurStat.MD5, sizeof(CurStat.MD5));
	 return true;
      }
   
   Stats.MD5Bytes += CurStat.FileSize;
	 
   if (Fd == NULL && OpenFile() == false)
   {
      return false;
   }
   MD5Summation MD5;
   if (Fd->Seek(0) == false || MD5.AddFD(*Fd, CurStat.FileSize) == false)
      return false;
   
   MD5Res = MD5.Result();
   hex2bytes(CurStat.MD5, MD5Res.data(), sizeof(CurStat.MD5));
      CurStat.Flags |= FlMD5;
   return true;
}
									/*}}}*/
// CacheDB::GetSHA1 - Get the SHA1 hash					/*{{{*/
// ---------------------------------------------------------------------
/* */
bool CacheDB::GetSHA1(bool const &GenOnly)
{
   // Try to read the control information out of the DB.
   if ((CurStat.Flags & FlSHA1) == FlSHA1)
   {
      if (GenOnly == true)
	 return true;

      SHA1Res = bytes2hex(CurStat.SHA1, sizeof(CurStat.SHA1));
      return true;
   }
   
   Stats.SHA1Bytes += CurStat.FileSize;
	 
   if (Fd == NULL && OpenFile() == false)
   {
      return false;
   }
   SHA1Summation SHA1;
   if (Fd->Seek(0) == false || SHA1.AddFD(*Fd, CurStat.FileSize) == false)
      return false;
   
   SHA1Res = SHA1.Result();
   hex2bytes(CurStat.SHA1, SHA1Res.data(), sizeof(CurStat.SHA1));
   CurStat.Flags |= FlSHA1;
   return true;
}
									/*}}}*/
// CacheDB::GetSHA256 - Get the SHA256 hash				/*{{{*/
// ---------------------------------------------------------------------
/* */
bool CacheDB::GetSHA256(bool const &GenOnly)
{
   // Try to read the control information out of the DB.
   if ((CurStat.Flags & FlSHA256) == FlSHA256)
   {
      if (GenOnly == true)
	 return true;

      SHA256Res = bytes2hex(CurStat.SHA256, sizeof(CurStat.SHA256));
      return true;
   }
   
   Stats.SHA256Bytes += CurStat.FileSize;
	 
   if (Fd == NULL && OpenFile() == false)
   {
      return false;
   }
   SHA256Summation SHA256;
   if (Fd->Seek(0) == false || SHA256.AddFD(*Fd, CurStat.FileSize) == false)
      return false;
   
   SHA256Res = SHA256.Result();
   hex2bytes(CurStat.SHA256, SHA256Res.data(), sizeof(CurStat.SHA256));
   CurStat.Flags |= FlSHA256;
   return true;
}
									/*}}}*/
// CacheDB::GetSHA256 - Get the SHA256 hash				/*{{{*/
// ---------------------------------------------------------------------
/* */
bool CacheDB::GetSHA512(bool const &GenOnly)
{
   // Try to read the control information out of the DB.
   if ((CurStat.Flags & FlSHA512) == FlSHA512)
   {
      if (GenOnly == true)
	 return true;

      SHA512Res = bytes2hex(CurStat.SHA512, sizeof(CurStat.SHA512));
      return true;
   }
   
   Stats.SHA512Bytes += CurStat.FileSize;
	 
   if (Fd == NULL && OpenFile() == false)
   {
      return false;
   }
   SHA512Summation SHA512;
   if (Fd->Seek(0) == false || SHA512.AddFD(*Fd, CurStat.FileSize) == false)
      return false;
   
   SHA512Res = SHA512.Result();
   hex2bytes(CurStat.SHA512, SHA512Res.data(), sizeof(CurStat.SHA512));
   CurStat.Flags |= FlSHA512;
   return true;
}
									/*}}}*/
// CacheDB::Finish - Write back the cache structure			/*{{{*/
// ---------------------------------------------------------------------
/* */
bool CacheDB::Finish()
{
   // Optimize away some writes.
   if (CurStat.Flags == OldStat.Flags &&
       CurStat.mtime == OldStat.mtime)
      return true;
   
   // Write the stat information
   CurStat.Flags = htonl(CurStat.Flags);
   CurStat.FileSize = htonl(CurStat.FileSize);
   InitQuery("st");
   Put(&CurStat,sizeof(CurStat));
   CurStat.Flags = ntohl(CurStat.Flags);
   CurStat.FileSize = ntohl(CurStat.FileSize);

   return true;
}
									/*}}}*/
// CacheDB::Clean - Clean the Database					/*{{{*/
// ---------------------------------------------------------------------
/* Tidy the database by removing files that no longer exist at all. */
bool CacheDB::Clean()
{
   if (DBLoaded == false)
      return true;

   /* I'm not sure what VERSION_MINOR should be here.. 2.4.14 certainly
      needs the lower one and 2.7.7 needs the upper.. */
   DBC *Cursor;
   if ((errno = Dbp->cursor(Dbp, NULL, &Cursor, 0)) != 0)
      return _error->Error(_("Unable to get a cursor"));
   
   DBT Key;
   DBT Data;
   memset(&Key,0,sizeof(Key));
   memset(&Data,0,sizeof(Data));
   while ((errno = Cursor->c_get(Cursor,&Key,&Data,DB_NEXT)) == 0)
   {
      const char *Colon = (char*)memrchr(Key.data, ':', Key.size);
      if (Colon)
      {
         if (stringcmp(Colon + 1, (char *)Key.data+Key.size,"st") == 0 ||
             stringcmp(Colon + 1, (char *)Key.data+Key.size,"cl") == 0 ||
             stringcmp(Colon + 1, (char *)Key.data+Key.size,"cn") == 0)
	 {
            if (FileExists(std::string((const char *)Key.data,Colon)) == true)
		continue;	     
	 }
      }
      
      Cursor->c_del(Cursor,0);
   }
   Dbp->compact(Dbp, NULL, NULL, NULL, NULL, DB_FREE_SPACE, NULL);

   return true;
}
									/*}}}*/
Commit	Line	Data
b2e465d6 AL	1	// -- mode: cpp; mode: fold --
b2e465d6 AL	2	// Description /{{{/
c9569a1e	3	// $Id: cachedb.cc,v 1.7 2004/05/08 19:41:01 mdz Exp $
b2e465d6 AL	4	/* ######################################################################
	5
	6	CacheDB
	7
	8	Simple uniform interface to a cache database.
	9
	10	##################################################################### */
	11	/}}}/
	12	// Include Files /{{{/
ea542140	13	#include <config.h>
b2e465d6 AL	14
	15	#include <apt-pkg/error.h>
	16	#include <apt-pkg/md5.h>
cde41ae8	17	#include <apt-pkg/sha1.h>
84a0890e	18	#include <apt-pkg/sha2.h>
b2e465d6 AL	19	#include <apt-pkg/strutl.h>
b2e465d6 AL	20	#include <apt-pkg/configuration.h>
472ff00e	21	#include <apt-pkg/fileutl.h>
b2e465d6 AL	22
b2e465d6 AL	23	#include <netinet/in.h> // htonl, etc
ea542140 DK	24
	25	#include <apti18n.h>
	26	#include "cachedb.h"
b2e465d6 AL	27	/}}}/
	28
	29	// CacheDB::ReadyDB - Ready the DB2 /{{{/
	30	// ---------------------------------------------------------------------
	31	/* This opens the DB2 file for caching package information */
8f3ba4e8	32	bool CacheDB::ReadyDB(std::string const &DB)
b2e465d6	33	{
c9569a1e AL	34	int err;
c9569a1e AL	35
b2e465d6 AL	36	ReadOnly = _config->FindB("APT::FTPArchive::ReadOnlyDB",false);
	37
	38	// Close the old DB
	39	if (Dbp != 0)
	40	Dbp->close(Dbp,0);
	41
	42	/* Check if the DB was disabled while running and deal with a
	43	corrupted DB */
	44	if (DBFailed() == true)
	45	{
dc738e7a	46	_error->Warning(_("DB was corrupted, file renamed to %s.old"),DBFile.c_str());
b2e465d6 AL	47	rename(DBFile.c_str(),(DBFile+".old").c_str());
	48	}
	49
	50	DBLoaded = false;
	51	Dbp = 0;
8f3ba4e8	52	DBFile = std::string();
b2e465d6 AL	53
	54	if (DB.empty())
	55	return true;
c9569a1e AL	56
c9569a1e AL	57	db_create(&Dbp, NULL, 0);
cde41ae8	58	if ((err = Dbp->open(Dbp, NULL, DB.c_str(), NULL, DB_BTREE,
b2e465d6	59	(ReadOnly?DB_RDONLY:DB_CREATE),
c9569a1e	60	0644)) != 0)
b2e465d6	61	{
c9569a1e AL	62	if (err == DB_OLD_VERSION)
	63	{
	64	_error->Warning(_("DB is old, attempting to upgrade %s"),DBFile.c_str());
	65	err = Dbp->upgrade(Dbp, DB.c_str(), 0);
	66	if (!err)
	67	err = Dbp->open(Dbp, NULL, DB.c_str(), NULL, DB_HASH,
	68	(ReadOnly?DB_RDONLY:DB_CREATE), 0644);
	69
	70	}
eb2bc4f2 MV	71	// the database format has changed from DB_HASH to DB_BTREE in
	72	// apt 0.6.44
	73	if (err == EINVAL)
	74	{
c6474fb6	75	_error->Error(_("DB format is invalid. If you upgraded from an older version of apt, please remove and re-create the database."));
eb2bc4f2	76	}
c9569a1e AL	77	if (err)
	78	{
	79	Dbp = 0;
	80	return _error->Error(_("Unable to open DB file %s: %s"),DB.c_str(), db_strerror(err));
	81	}
b2e465d6 AL	82	}
	83
	84	DBFile = DB;
	85	DBLoaded = true;
	86	return true;
	87	}
	88	/}}}/
c6474fb6	89	// CacheDB::OpenFile - Open the file /{{{/
b2e465d6	90	// ---------------------------------------------------------------------
cde41ae8 MV	91	/* */
	92	bool CacheDB::OpenFile()
	93	{
	94	Fd = new FileFd(FileName,FileFd::ReadOnly);
	95	if (_error->PendingError() == true)
	96	{
	97	delete Fd;
	98	Fd = NULL;
	99	return false;
	100	}
	101	return true;
	102	}
	103	/}}}/
	104	// CacheDB::GetFileStat - Get stats from the file /{{{/
	105	// ---------------------------------------------------------------------
	106	/* This gets the size from the database if it's there. If we need
	107	* to look at the file, also get the mtime from the file. */
ff574e76	108	bool CacheDB::GetFileStat(bool const &doStat)
cde41ae8	109	{
ff574e76	110	if ((CurStat.Flags & FlSize) == FlSize && doStat == false)
cde41ae8 MV	111	{
	112	/* Already worked out the file size */
	113	}
	114	else
	115	{
	116	/* Get it from the file. */
	117	if (Fd == NULL && OpenFile() == false)
	118	{
	119	return false;
	120	}
	121	// Stat the file
	122	struct stat St;
	123	if (fstat(Fd->Fd(),&St) != 0)
	124	{
	125	return _error->Errno("fstat",
	126	_("Failed to stat %s"),FileName.c_str());
	127	}
	128	CurStat.FileSize = St.st_size;
	129	CurStat.mtime = htonl(St.st_mtime);
	130	CurStat.Flags \|= FlSize;
	131	}
	132	return true;
	133	}
	134	/}}}/
	135	// CacheDB::GetCurStat - Set the CurStat variable. /{{{/
	136	// ---------------------------------------------------------------------
	137	/* Sets the CurStat variable. Either to 0 if no database is used
	138	* or to the value in the database if one is used */
	139	bool CacheDB::GetCurStat()
b2e465d6	140	{
b2e465d6 AL	141	memset(&CurStat,0,sizeof(CurStat));
b2e465d6 AL	142
cde41ae8 MV	143	if (DBLoaded)
cde41ae8 MV	144	{
c6474fb6	145	/* First see if there is anything about it
cde41ae8	146	in the database */
b2e465d6	147
cde41ae8	148	/* Get the flags (and mtime) */
b2e465d6	149	InitQuery("st");
b2e465d6 AL	150	// Ensure alignment of the returned structure
	151	Data.data = &CurStat;
	152	Data.ulen = sizeof(CurStat);
	153	Data.flags = DB_DBT_USERMEM;
cde41ae8	154	if (Get() == false)
b2e465d6	155	{
b2e465d6	156	CurStat.Flags = 0;
b2e465d6	157	}
cde41ae8 MV	158	CurStat.Flags = ntohl(CurStat.Flags);
cde41ae8 MV	159	CurStat.FileSize = ntohl(CurStat.FileSize);
b2e465d6	160	}
cde41ae8 MV	161	return true;
	162	}
	163	/}}}/
	164	// CacheDB::GetFileInfo - Get all the info about the file /{{{/
	165	// ---------------------------------------------------------------------
8f3ba4e8	166	bool CacheDB::GetFileInfo(std::string const &FileName, bool const &DoControl, bool const &DoContents,
9209ec47	167	bool const &GenContentsOnly, bool const &DoMD5, bool const &DoSHA1,
9a961efc MV	168	bool const &DoSHA256, bool const &DoSHA512,
9a961efc MV	169	bool const &checkMtime)
cde41ae8 MV	170	{
	171	this->FileName = FileName;
	172
	173	if (GetCurStat() == false)
b2e465d6	174	{
cde41ae8	175	return false;
b2e465d6	176	}
b2e465d6	177	OldStat = CurStat;
ff574e76 DK	178
ff574e76 DK	179	if (GetFileStat(checkMtime) == false)
cde41ae8 MV	180	{
	181	delete Fd;
	182	Fd = NULL;
	183	return false;
	184	}
	185
ff574e76 DK	186	/* if mtime changed, update CurStat from disk */
	187	if (checkMtime == true && OldStat.mtime != CurStat.mtime)
	188	CurStat.Flags = FlSize;
	189
cde41ae8 MV	190	Stats.Bytes += CurStat.FileSize;
	191	Stats.Packages++;
	192
2a5f8389 DK	193	if ((DoControl && LoadControl() == false)
	194	\|\| (DoContents && LoadContents(GenContentsOnly) == false)
	195	\|\| (DoMD5 && GetMD5(false) == false)
	196	\|\| (DoSHA1 && GetSHA1(false) == false)
9a961efc MV	197	\|\| (DoSHA256 && GetSHA256(false) == false)
	198	\|\| (DoSHA512 && GetSHA512(false) == false)
	199	)
cde41ae8 MV	200	{
	201	delete Fd;
	202	Fd = NULL;
	203	delete DebFile;
	204	DebFile = NULL;
	205	return false;
	206	}
	207
	208	delete Fd;
	209	Fd = NULL;
	210	delete DebFile;
	211	DebFile = NULL;
	212
b2e465d6 AL	213	return true;
	214	}
	215	/}}}/
	216	// CacheDB::LoadControl - Load Control information /{{{/
	217	// ---------------------------------------------------------------------
	218	/* */
	219	bool CacheDB::LoadControl()
	220	{
	221	// Try to read the control information out of the DB.
	222	if ((CurStat.Flags & FlControl) == FlControl)
	223	{
	224	// Lookup the control information
	225	InitQuery("cl");
	226	if (Get() == true && Control.TakeControl(Data.data,Data.size) == true)
	227	return true;
	228	CurStat.Flags &= ~FlControl;
	229	}
	230
cde41ae8 MV	231	if (Fd == NULL && OpenFile() == false)
	232	{
	233	return false;
	234	}
b2e465d6 AL	235	// Create a deb instance to read the archive
	236	if (DebFile == 0)
	237	{
	238	DebFile = new debDebFile(*Fd);
	239	if (_error->PendingError() == true)
	240	return false;
	241	}
	242
	243	Stats.Misses++;
	244	if (Control.Read(*DebFile) == false)
	245	return false;
	246
	247	if (Control.Control == 0)
dc738e7a	248	return _error->Error(_("Archive has no control record"));
b2e465d6 AL	249
	250	// Write back the control information
	251	InitQuery("cl");
	252	if (Put(Control.Control,Control.Length) == true)
	253	CurStat.Flags \|= FlControl;
	254	return true;
	255	}
	256	/}}}/
	257	// CacheDB::LoadContents - Load the File Listing /{{{/
	258	// ---------------------------------------------------------------------
	259	/* */
9209ec47	260	bool CacheDB::LoadContents(bool const &GenOnly)
b2e465d6 AL	261	{
	262	// Try to read the control information out of the DB.
	263	if ((CurStat.Flags & FlContents) == FlContents)
	264	{
	265	if (GenOnly == true)
	266	return true;
	267
	268	// Lookup the contents information
	269	InitQuery("cn");
	270	if (Get() == true)
	271	{
	272	if (Contents.TakeContents(Data.data,Data.size) == true)
	273	return true;
	274	}
	275
	276	CurStat.Flags &= ~FlContents;
	277	}
	278
cde41ae8 MV	279	if (Fd == NULL && OpenFile() == false)
	280	{
	281	return false;
	282	}
b2e465d6 AL	283	// Create a deb instance to read the archive
	284	if (DebFile == 0)
	285	{
	286	DebFile = new debDebFile(*Fd);
	287	if (_error->PendingError() == true)
	288	return false;
	289	}
	290
	291	if (Contents.Read(*DebFile) == false)
	292	return false;
	293
	294	// Write back the control information
	295	InitQuery("cn");
	296	if (Put(Contents.Data,Contents.CurSize) == true)
	297	CurStat.Flags \|= FlContents;
	298	return true;
	299	}
	300	/}}}/
cde41ae8	301
8f3ba4e8	302	static std::string bytes2hex(uint8_t *bytes, size_t length) {
76ef756a	303	char buf[3];
0fffbc8c	304	std::string space;
76ef756a MV	305
	306	space.reserve(length*2 + 1);
	307	for (size_t i = 0; i < length; i++) {
	308	snprintf(buf, sizeof(buf), "%02x", bytes[i]);
	309	space.append(buf);
	310	}
	311	return space;
cde41ae8 MV	312	}
cde41ae8 MV	313
9209ec47	314	static inline unsigned char xdig2num(char const &dig) {
cde41ae8 MV	315	if (isdigit(dig)) return dig - '0';
	316	if ('a' <= dig && dig <= 'f') return dig - 'a' + 10;
	317	if ('A' <= dig && dig <= 'F') return dig - 'A' + 10;
	318	return 0;
	319	}
	320
	321	static void hex2bytes(uint8_t bytes, const char hex, int length) {
	322	while (length-- > 0) {
	323	*bytes = 0;
	324	if (isxdigit(hex[0]) && isxdigit(hex[1])) {
	325	bytes = xdig2num(hex[0]) 16 + xdig2num(hex[1]);
	326	hex += 2;
	327	}
	328	bytes++;
	329	}
	330	}
	331
b2e465d6 AL	332	// CacheDB::GetMD5 - Get the MD5 hash /{{{/
	333	// ---------------------------------------------------------------------
	334	/* */
9209ec47	335	bool CacheDB::GetMD5(bool const &GenOnly)
b2e465d6 AL	336	{
	337	// Try to read the control information out of the DB.
	338	if ((CurStat.Flags & FlMD5) == FlMD5)
	339	{
	340	if (GenOnly == true)
	341	return true;
	342
cde41ae8	343	MD5Res = bytes2hex(CurStat.MD5, sizeof(CurStat.MD5));
b2e465d6 AL	344	return true;
b2e465d6 AL	345	}
b2e465d6	346
cde41ae8	347	Stats.MD5Bytes += CurStat.FileSize;
b2e465d6	348
cde41ae8 MV	349	if (Fd == NULL && OpenFile() == false)
	350	{
	351	return false;
	352	}
b2e465d6	353	MD5Summation MD5;
109eb151	354	if (Fd->Seek(0) == false \|\| MD5.AddFD(*Fd, CurStat.FileSize) == false)
b2e465d6 AL	355	return false;
	356
	357	MD5Res = MD5.Result();
cde41ae8	358	hex2bytes(CurStat.MD5, MD5Res.data(), sizeof(CurStat.MD5));
b2e465d6 AL	359	CurStat.Flags \|= FlMD5;
	360	return true;
	361	}
	362	/}}}/
cde41ae8 MV	363	// CacheDB::GetSHA1 - Get the SHA1 hash /{{{/
	364	// ---------------------------------------------------------------------
	365	/* */
9209ec47	366	bool CacheDB::GetSHA1(bool const &GenOnly)
cde41ae8 MV	367	{
	368	// Try to read the control information out of the DB.
	369	if ((CurStat.Flags & FlSHA1) == FlSHA1)
	370	{
	371	if (GenOnly == true)
	372	return true;
	373
	374	SHA1Res = bytes2hex(CurStat.SHA1, sizeof(CurStat.SHA1));
	375	return true;
	376	}
	377
	378	Stats.SHA1Bytes += CurStat.FileSize;
	379
	380	if (Fd == NULL && OpenFile() == false)
	381	{
	382	return false;
	383	}
	384	SHA1Summation SHA1;
109eb151	385	if (Fd->Seek(0) == false \|\| SHA1.AddFD(*Fd, CurStat.FileSize) == false)
cde41ae8 MV	386	return false;
	387
	388	SHA1Res = SHA1.Result();
	389	hex2bytes(CurStat.SHA1, SHA1Res.data(), sizeof(CurStat.SHA1));
	390	CurStat.Flags \|= FlSHA1;
	391	return true;
	392	}
	393	/}}}/
	394	// CacheDB::GetSHA256 - Get the SHA256 hash /{{{/
	395	// ---------------------------------------------------------------------
	396	/* */
9209ec47	397	bool CacheDB::GetSHA256(bool const &GenOnly)
cde41ae8 MV	398	{
	399	// Try to read the control information out of the DB.
	400	if ((CurStat.Flags & FlSHA256) == FlSHA256)
	401	{
	402	if (GenOnly == true)
	403	return true;
	404
	405	SHA256Res = bytes2hex(CurStat.SHA256, sizeof(CurStat.SHA256));
	406	return true;
	407	}
	408
	409	Stats.SHA256Bytes += CurStat.FileSize;
	410
	411	if (Fd == NULL && OpenFile() == false)
	412	{
	413	return false;
	414	}
	415	SHA256Summation SHA256;
109eb151	416	if (Fd->Seek(0) == false \|\| SHA256.AddFD(*Fd, CurStat.FileSize) == false)
cde41ae8 MV	417	return false;
	418
	419	SHA256Res = SHA256.Result();
	420	hex2bytes(CurStat.SHA256, SHA256Res.data(), sizeof(CurStat.SHA256));
	421	CurStat.Flags \|= FlSHA256;
	422	return true;
	423	}
	424	/}}}/
9a961efc MV	425	// CacheDB::GetSHA256 - Get the SHA256 hash /{{{/
	426	// ---------------------------------------------------------------------
	427	/* */
	428	bool CacheDB::GetSHA512(bool const &GenOnly)
	429	{
	430	// Try to read the control information out of the DB.
	431	if ((CurStat.Flags & FlSHA512) == FlSHA512)
	432	{
	433	if (GenOnly == true)
	434	return true;
	435
	436	SHA512Res = bytes2hex(CurStat.SHA512, sizeof(CurStat.SHA512));
	437	return true;
	438	}
	439
	440	Stats.SHA512Bytes += CurStat.FileSize;
	441
	442	if (Fd == NULL && OpenFile() == false)
	443	{
	444	return false;
	445	}
	446	SHA512Summation SHA512;
109eb151	447	if (Fd->Seek(0) == false \|\| SHA512.AddFD(*Fd, CurStat.FileSize) == false)
9a961efc MV	448	return false;
	449
	450	SHA512Res = SHA512.Result();
	451	hex2bytes(CurStat.SHA512, SHA512Res.data(), sizeof(CurStat.SHA512));
	452	CurStat.Flags \|= FlSHA512;
	453	return true;
	454	}
	455	/}}}/
b2e465d6 AL	456	// CacheDB::Finish - Write back the cache structure /{{{/
	457	// ---------------------------------------------------------------------
	458	/* */
	459	bool CacheDB::Finish()
	460	{
	461	// Optimize away some writes.
	462	if (CurStat.Flags == OldStat.Flags &&
9bfe66dc	463	CurStat.mtime == OldStat.mtime)
b2e465d6 AL	464	return true;
	465
	466	// Write the stat information
	467	CurStat.Flags = htonl(CurStat.Flags);
cde41ae8	468	CurStat.FileSize = htonl(CurStat.FileSize);
b2e465d6 AL	469	InitQuery("st");
	470	Put(&CurStat,sizeof(CurStat));
	471	CurStat.Flags = ntohl(CurStat.Flags);
cde41ae8 MV	472	CurStat.FileSize = ntohl(CurStat.FileSize);
cde41ae8 MV	473
b2e465d6 AL	474	return true;
	475	}
	476	/}}}/
	477	// CacheDB::Clean - Clean the Database /{{{/
	478	// ---------------------------------------------------------------------
	479	/* Tidy the database by removing files that no longer exist at all. */
	480	bool CacheDB::Clean()
	481	{
	482	if (DBLoaded == false)
	483	return true;
	484
	485	/* I'm not sure what VERSION_MINOR should be here.. 2.4.14 certainly
	486	needs the lower one and 2.7.7 needs the upper.. */
b2e465d6	487	DBC *Cursor;
c9569a1e	488	if ((errno = Dbp->cursor(Dbp, NULL, &Cursor, 0)) != 0)
dc738e7a	489	return _error->Error(_("Unable to get a cursor"));
b2e465d6 AL	490
	491	DBT Key;
	492	DBT Data;
	493	memset(&Key,0,sizeof(Key));
	494	memset(&Data,0,sizeof(Data));
	495	while ((errno = Cursor->c_get(Cursor,&Key,&Data,DB_NEXT)) == 0)
	496	{
592b401a MV	497	const char Colon = (char)memrchr(Key.data, ':', Key.size);
592b401a MV	498	if (Colon)
b2e465d6	499	{
592b401a MV	500	if (stringcmp(Colon + 1, (char *)Key.data+Key.size,"st") == 0 \|\|
	501	stringcmp(Colon + 1, (char *)Key.data+Key.size,"cl") == 0 \|\|
	502	stringcmp(Colon + 1, (char *)Key.data+Key.size,"cn") == 0)
b2e465d6	503	{
8f3ba4e8	504	if (FileExists(std::string((const char *)Key.data,Colon)) == true)
b2e465d6 AL	505	continue;
	506	}
	507	}
	508
	509	Cursor->c_del(Cursor,0);
	510	}
09fab244	511	Dbp->compact(Dbp, NULL, NULL, NULL, NULL, DB_FREE_SPACE, NULL);
b2e465d6 AL	512
	513	return true;
	514	}
	515	/}}}/