[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 "cachedb.h"

#include <apti18n.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>
a00a9b44	22
b2e465d6	23	#include <netinet/in.h> // htonl, etc
ea542140	24
ea542140	25	#include "cachedb.h"
a00a9b44 DK	26
a00a9b44 DK	27	#include <apti18n.h>
b2e465d6 AL	28	/}}}/
	29
	30	// CacheDB::ReadyDB - Ready the DB2 /{{{/
	31	// ---------------------------------------------------------------------
	32	/* This opens the DB2 file for caching package information */
8f3ba4e8	33	bool CacheDB::ReadyDB(std::string const &DB)
b2e465d6	34	{
c9569a1e AL	35	int err;
c9569a1e AL	36
b2e465d6 AL	37	ReadOnly = _config->FindB("APT::FTPArchive::ReadOnlyDB",false);
	38
	39	// Close the old DB
	40	if (Dbp != 0)
	41	Dbp->close(Dbp,0);
	42
	43	/* Check if the DB was disabled while running and deal with a
	44	corrupted DB */
	45	if (DBFailed() == true)
	46	{
dc738e7a	47	_error->Warning(_("DB was corrupted, file renamed to %s.old"),DBFile.c_str());
b2e465d6 AL	48	rename(DBFile.c_str(),(DBFile+".old").c_str());
	49	}
	50
	51	DBLoaded = false;
	52	Dbp = 0;
8f3ba4e8	53	DBFile = std::string();
b2e465d6 AL	54
	55	if (DB.empty())
	56	return true;
c9569a1e AL	57
c9569a1e AL	58	db_create(&Dbp, NULL, 0);
cde41ae8	59	if ((err = Dbp->open(Dbp, NULL, DB.c_str(), NULL, DB_BTREE,
b2e465d6	60	(ReadOnly?DB_RDONLY:DB_CREATE),
c9569a1e	61	0644)) != 0)
b2e465d6	62	{
c9569a1e AL	63	if (err == DB_OLD_VERSION)
	64	{
	65	_error->Warning(_("DB is old, attempting to upgrade %s"),DBFile.c_str());
	66	err = Dbp->upgrade(Dbp, DB.c_str(), 0);
	67	if (!err)
	68	err = Dbp->open(Dbp, NULL, DB.c_str(), NULL, DB_HASH,
	69	(ReadOnly?DB_RDONLY:DB_CREATE), 0644);
	70
	71	}
eb2bc4f2 MV	72	// the database format has changed from DB_HASH to DB_BTREE in
	73	// apt 0.6.44
	74	if (err == EINVAL)
	75	{
c6474fb6	76	_error->Error(_("DB format is invalid. If you upgraded from an older version of apt, please remove and re-create the database."));
eb2bc4f2	77	}
c9569a1e AL	78	if (err)
	79	{
	80	Dbp = 0;
	81	return _error->Error(_("Unable to open DB file %s: %s"),DB.c_str(), db_strerror(err));
	82	}
b2e465d6 AL	83	}
	84
	85	DBFile = DB;
	86	DBLoaded = true;
	87	return true;
	88	}
	89	/}}}/
c6474fb6	90	// CacheDB::OpenFile - Open the file /{{{/
b2e465d6	91	// ---------------------------------------------------------------------
cde41ae8 MV	92	/* */
	93	bool CacheDB::OpenFile()
	94	{
	95	Fd = new FileFd(FileName,FileFd::ReadOnly);
	96	if (_error->PendingError() == true)
	97	{
	98	delete Fd;
	99	Fd = NULL;
	100	return false;
	101	}
	102	return true;
	103	}
	104	/}}}/
	105	// CacheDB::GetFileStat - Get stats from the file /{{{/
	106	// ---------------------------------------------------------------------
	107	/* This gets the size from the database if it's there. If we need
	108	* to look at the file, also get the mtime from the file. */
ff574e76	109	bool CacheDB::GetFileStat(bool const &doStat)
cde41ae8	110	{
ff574e76	111	if ((CurStat.Flags & FlSize) == FlSize && doStat == false)
cde41ae8 MV	112	{
	113	/* Already worked out the file size */
	114	}
	115	else
	116	{
	117	/* Get it from the file. */
	118	if (Fd == NULL && OpenFile() == false)
	119	{
	120	return false;
	121	}
	122	// Stat the file
	123	struct stat St;
	124	if (fstat(Fd->Fd(),&St) != 0)
	125	{
	126	return _error->Errno("fstat",
	127	_("Failed to stat %s"),FileName.c_str());
	128	}
	129	CurStat.FileSize = St.st_size;
	130	CurStat.mtime = htonl(St.st_mtime);
	131	CurStat.Flags \|= FlSize;
	132	}
	133	return true;
	134	}
	135	/}}}/
	136	// CacheDB::GetCurStat - Set the CurStat variable. /{{{/
	137	// ---------------------------------------------------------------------
	138	/* Sets the CurStat variable. Either to 0 if no database is used
	139	* or to the value in the database if one is used */
	140	bool CacheDB::GetCurStat()
b2e465d6	141	{
b2e465d6 AL	142	memset(&CurStat,0,sizeof(CurStat));
b2e465d6 AL	143
cde41ae8 MV	144	if (DBLoaded)
cde41ae8 MV	145	{
c6474fb6	146	/* First see if there is anything about it
cde41ae8	147	in the database */
b2e465d6	148
cde41ae8	149	/* Get the flags (and mtime) */
b2e465d6	150	InitQuery("st");
b2e465d6 AL	151	// Ensure alignment of the returned structure
	152	Data.data = &CurStat;
	153	Data.ulen = sizeof(CurStat);
	154	Data.flags = DB_DBT_USERMEM;
cde41ae8	155	if (Get() == false)
b2e465d6	156	{
b2e465d6	157	CurStat.Flags = 0;
b2e465d6	158	}
cde41ae8 MV	159	CurStat.Flags = ntohl(CurStat.Flags);
cde41ae8 MV	160	CurStat.FileSize = ntohl(CurStat.FileSize);
b2e465d6	161	}
cde41ae8 MV	162	return true;
	163	}
	164	/}}}/
	165	// CacheDB::GetFileInfo - Get all the info about the file /{{{/
	166	// ---------------------------------------------------------------------
8f3ba4e8	167	bool CacheDB::GetFileInfo(std::string const &FileName, bool const &DoControl, bool const &DoContents,
9209ec47	168	bool const &GenContentsOnly, bool const &DoMD5, bool const &DoSHA1,
9a961efc MV	169	bool const &DoSHA256, bool const &DoSHA512,
9a961efc MV	170	bool const &checkMtime)
cde41ae8 MV	171	{
	172	this->FileName = FileName;
	173
	174	if (GetCurStat() == false)
b2e465d6	175	{
cde41ae8	176	return false;
b2e465d6	177	}
b2e465d6	178	OldStat = CurStat;
ff574e76 DK	179
ff574e76 DK	180	if (GetFileStat(checkMtime) == false)
cde41ae8 MV	181	{
	182	delete Fd;
	183	Fd = NULL;
	184	return false;
	185	}
	186
ff574e76 DK	187	/* if mtime changed, update CurStat from disk */
	188	if (checkMtime == true && OldStat.mtime != CurStat.mtime)
	189	CurStat.Flags = FlSize;
	190
cde41ae8 MV	191	Stats.Bytes += CurStat.FileSize;
	192	Stats.Packages++;
	193
2a5f8389 DK	194	if ((DoControl && LoadControl() == false)
	195	\|\| (DoContents && LoadContents(GenContentsOnly) == false)
	196	\|\| (DoMD5 && GetMD5(false) == false)
	197	\|\| (DoSHA1 && GetSHA1(false) == false)
9a961efc MV	198	\|\| (DoSHA256 && GetSHA256(false) == false)
	199	\|\| (DoSHA512 && GetSHA512(false) == false)
	200	)
cde41ae8 MV	201	{
	202	delete Fd;
	203	Fd = NULL;
	204	delete DebFile;
	205	DebFile = NULL;
	206	return false;
	207	}
	208
	209	delete Fd;
	210	Fd = NULL;
	211	delete DebFile;
	212	DebFile = NULL;
	213
b2e465d6 AL	214	return true;
	215	}
	216	/}}}/
	217	// CacheDB::LoadControl - Load Control information /{{{/
	218	// ---------------------------------------------------------------------
	219	/* */
	220	bool CacheDB::LoadControl()
	221	{
	222	// Try to read the control information out of the DB.
	223	if ((CurStat.Flags & FlControl) == FlControl)
	224	{
	225	// Lookup the control information
	226	InitQuery("cl");
	227	if (Get() == true && Control.TakeControl(Data.data,Data.size) == true)
	228	return true;
	229	CurStat.Flags &= ~FlControl;
	230	}
	231
cde41ae8 MV	232	if (Fd == NULL && OpenFile() == false)
	233	{
	234	return false;
	235	}
b2e465d6 AL	236	// Create a deb instance to read the archive
	237	if (DebFile == 0)
	238	{
	239	DebFile = new debDebFile(*Fd);
	240	if (_error->PendingError() == true)
	241	return false;
	242	}
	243
	244	Stats.Misses++;
	245	if (Control.Read(*DebFile) == false)
	246	return false;
	247
	248	if (Control.Control == 0)
dc738e7a	249	return _error->Error(_("Archive has no control record"));
b2e465d6 AL	250
	251	// Write back the control information
	252	InitQuery("cl");
	253	if (Put(Control.Control,Control.Length) == true)
	254	CurStat.Flags \|= FlControl;
	255	return true;
	256	}
	257	/}}}/
	258	// CacheDB::LoadContents - Load the File Listing /{{{/
	259	// ---------------------------------------------------------------------
	260	/* */
9209ec47	261	bool CacheDB::LoadContents(bool const &GenOnly)
b2e465d6 AL	262	{
	263	// Try to read the control information out of the DB.
	264	if ((CurStat.Flags & FlContents) == FlContents)
	265	{
	266	if (GenOnly == true)
	267	return true;
	268
	269	// Lookup the contents information
	270	InitQuery("cn");
	271	if (Get() == true)
	272	{
	273	if (Contents.TakeContents(Data.data,Data.size) == true)
	274	return true;
	275	}
	276
	277	CurStat.Flags &= ~FlContents;
	278	}
	279
cde41ae8 MV	280	if (Fd == NULL && OpenFile() == false)
	281	{
	282	return false;
	283	}
b2e465d6 AL	284	// Create a deb instance to read the archive
	285	if (DebFile == 0)
	286	{
	287	DebFile = new debDebFile(*Fd);
	288	if (_error->PendingError() == true)
	289	return false;
	290	}
	291
	292	if (Contents.Read(*DebFile) == false)
	293	return false;
	294
	295	// Write back the control information
	296	InitQuery("cn");
	297	if (Put(Contents.Data,Contents.CurSize) == true)
	298	CurStat.Flags \|= FlContents;
	299	return true;
	300	}
	301	/}}}/
cde41ae8	302
8f3ba4e8	303	static std::string bytes2hex(uint8_t *bytes, size_t length) {
76ef756a	304	char buf[3];
0fffbc8c	305	std::string space;
76ef756a MV	306
	307	space.reserve(length*2 + 1);
	308	for (size_t i = 0; i < length; i++) {
	309	snprintf(buf, sizeof(buf), "%02x", bytes[i]);
	310	space.append(buf);
	311	}
	312	return space;
cde41ae8 MV	313	}
cde41ae8 MV	314
9209ec47	315	static inline unsigned char xdig2num(char const &dig) {
cde41ae8 MV	316	if (isdigit(dig)) return dig - '0';
	317	if ('a' <= dig && dig <= 'f') return dig - 'a' + 10;
	318	if ('A' <= dig && dig <= 'F') return dig - 'A' + 10;
	319	return 0;
	320	}
	321
	322	static void hex2bytes(uint8_t bytes, const char hex, int length) {
	323	while (length-- > 0) {
	324	*bytes = 0;
	325	if (isxdigit(hex[0]) && isxdigit(hex[1])) {
	326	bytes = xdig2num(hex[0]) 16 + xdig2num(hex[1]);
	327	hex += 2;
	328	}
	329	bytes++;
	330	}
	331	}
	332
b2e465d6 AL	333	// CacheDB::GetMD5 - Get the MD5 hash /{{{/
	334	// ---------------------------------------------------------------------
	335	/* */
9209ec47	336	bool CacheDB::GetMD5(bool const &GenOnly)
b2e465d6 AL	337	{
	338	// Try to read the control information out of the DB.
	339	if ((CurStat.Flags & FlMD5) == FlMD5)
	340	{
	341	if (GenOnly == true)
	342	return true;
	343
cde41ae8	344	MD5Res = bytes2hex(CurStat.MD5, sizeof(CurStat.MD5));
b2e465d6 AL	345	return true;
b2e465d6 AL	346	}
b2e465d6	347
cde41ae8	348	Stats.MD5Bytes += CurStat.FileSize;
b2e465d6	349
cde41ae8 MV	350	if (Fd == NULL && OpenFile() == false)
	351	{
	352	return false;
	353	}
b2e465d6	354	MD5Summation MD5;
109eb151	355	if (Fd->Seek(0) == false \|\| MD5.AddFD(*Fd, CurStat.FileSize) == false)
b2e465d6 AL	356	return false;
	357
	358	MD5Res = MD5.Result();
cde41ae8	359	hex2bytes(CurStat.MD5, MD5Res.data(), sizeof(CurStat.MD5));
b2e465d6 AL	360	CurStat.Flags \|= FlMD5;
	361	return true;
	362	}
	363	/}}}/
cde41ae8 MV	364	// CacheDB::GetSHA1 - Get the SHA1 hash /{{{/
	365	// ---------------------------------------------------------------------
	366	/* */
9209ec47	367	bool CacheDB::GetSHA1(bool const &GenOnly)
cde41ae8 MV	368	{
	369	// Try to read the control information out of the DB.
	370	if ((CurStat.Flags & FlSHA1) == FlSHA1)
	371	{
	372	if (GenOnly == true)
	373	return true;
	374
	375	SHA1Res = bytes2hex(CurStat.SHA1, sizeof(CurStat.SHA1));
	376	return true;
	377	}
	378
	379	Stats.SHA1Bytes += CurStat.FileSize;
	380
	381	if (Fd == NULL && OpenFile() == false)
	382	{
	383	return false;
	384	}
	385	SHA1Summation SHA1;
109eb151	386	if (Fd->Seek(0) == false \|\| SHA1.AddFD(*Fd, CurStat.FileSize) == false)
cde41ae8 MV	387	return false;
	388
	389	SHA1Res = SHA1.Result();
	390	hex2bytes(CurStat.SHA1, SHA1Res.data(), sizeof(CurStat.SHA1));
	391	CurStat.Flags \|= FlSHA1;
	392	return true;
	393	}
	394	/}}}/
	395	// CacheDB::GetSHA256 - Get the SHA256 hash /{{{/
	396	// ---------------------------------------------------------------------
	397	/* */
9209ec47	398	bool CacheDB::GetSHA256(bool const &GenOnly)
cde41ae8 MV	399	{
	400	// Try to read the control information out of the DB.
	401	if ((CurStat.Flags & FlSHA256) == FlSHA256)
	402	{
	403	if (GenOnly == true)
	404	return true;
	405
	406	SHA256Res = bytes2hex(CurStat.SHA256, sizeof(CurStat.SHA256));
	407	return true;
	408	}
	409
	410	Stats.SHA256Bytes += CurStat.FileSize;
	411
	412	if (Fd == NULL && OpenFile() == false)
	413	{
	414	return false;
	415	}
	416	SHA256Summation SHA256;
109eb151	417	if (Fd->Seek(0) == false \|\| SHA256.AddFD(*Fd, CurStat.FileSize) == false)
cde41ae8 MV	418	return false;
	419
	420	SHA256Res = SHA256.Result();
	421	hex2bytes(CurStat.SHA256, SHA256Res.data(), sizeof(CurStat.SHA256));
	422	CurStat.Flags \|= FlSHA256;
	423	return true;
	424	}
	425	/}}}/
9a961efc MV	426	// CacheDB::GetSHA256 - Get the SHA256 hash /{{{/
	427	// ---------------------------------------------------------------------
	428	/* */
	429	bool CacheDB::GetSHA512(bool const &GenOnly)
	430	{
	431	// Try to read the control information out of the DB.
	432	if ((CurStat.Flags & FlSHA512) == FlSHA512)
	433	{
	434	if (GenOnly == true)
	435	return true;
	436
	437	SHA512Res = bytes2hex(CurStat.SHA512, sizeof(CurStat.SHA512));
	438	return true;
	439	}
	440
	441	Stats.SHA512Bytes += CurStat.FileSize;
	442
	443	if (Fd == NULL && OpenFile() == false)
	444	{
	445	return false;
	446	}
	447	SHA512Summation SHA512;
109eb151	448	if (Fd->Seek(0) == false \|\| SHA512.AddFD(*Fd, CurStat.FileSize) == false)
9a961efc MV	449	return false;
	450
	451	SHA512Res = SHA512.Result();
	452	hex2bytes(CurStat.SHA512, SHA512Res.data(), sizeof(CurStat.SHA512));
	453	CurStat.Flags \|= FlSHA512;
	454	return true;
	455	}
	456	/}}}/
b2e465d6 AL	457	// CacheDB::Finish - Write back the cache structure /{{{/
	458	// ---------------------------------------------------------------------
	459	/* */
	460	bool CacheDB::Finish()
	461	{
	462	// Optimize away some writes.
	463	if (CurStat.Flags == OldStat.Flags &&
9bfe66dc	464	CurStat.mtime == OldStat.mtime)
b2e465d6 AL	465	return true;
	466
	467	// Write the stat information
	468	CurStat.Flags = htonl(CurStat.Flags);
cde41ae8	469	CurStat.FileSize = htonl(CurStat.FileSize);
b2e465d6 AL	470	InitQuery("st");
	471	Put(&CurStat,sizeof(CurStat));
	472	CurStat.Flags = ntohl(CurStat.Flags);
cde41ae8 MV	473	CurStat.FileSize = ntohl(CurStat.FileSize);
cde41ae8 MV	474
b2e465d6 AL	475	return true;
	476	}
	477	/}}}/
	478	// CacheDB::Clean - Clean the Database /{{{/
	479	// ---------------------------------------------------------------------
	480	/* Tidy the database by removing files that no longer exist at all. */
	481	bool CacheDB::Clean()
	482	{
	483	if (DBLoaded == false)
	484	return true;
	485
	486	/* I'm not sure what VERSION_MINOR should be here.. 2.4.14 certainly
	487	needs the lower one and 2.7.7 needs the upper.. */
b2e465d6	488	DBC *Cursor;
c9569a1e	489	if ((errno = Dbp->cursor(Dbp, NULL, &Cursor, 0)) != 0)
dc738e7a	490	return _error->Error(_("Unable to get a cursor"));
b2e465d6 AL	491
	492	DBT Key;
	493	DBT Data;
	494	memset(&Key,0,sizeof(Key));
	495	memset(&Data,0,sizeof(Data));
	496	while ((errno = Cursor->c_get(Cursor,&Key,&Data,DB_NEXT)) == 0)
	497	{
592b401a MV	498	const char Colon = (char)memrchr(Key.data, ':', Key.size);
592b401a MV	499	if (Colon)
b2e465d6	500	{
592b401a MV	501	if (stringcmp(Colon + 1, (char *)Key.data+Key.size,"st") == 0 \|\|
	502	stringcmp(Colon + 1, (char *)Key.data+Key.size,"cl") == 0 \|\|
	503	stringcmp(Colon + 1, (char *)Key.data+Key.size,"cn") == 0)
b2e465d6	504	{
8f3ba4e8	505	if (FileExists(std::string((const char *)Key.data,Colon)) == true)
b2e465d6 AL	506	continue;
	507	}
	508	}
	509
	510	Cursor->c_del(Cursor,0);
	511	}
09fab244	512	Dbp->compact(Dbp, NULL, NULL, NULL, NULL, DB_FREE_SPACE, NULL);
b2e465d6 AL	513
	514	return true;
	515	}
	516	/}}}/