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