[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 <apt-pkg/debfile.h>

#include <netinet/in.h>       // htonl, etc
#include <ctype.h>
#include <stddef.h>
#include <sys/stat.h>

#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>
453b82a3	22	#include <apt-pkg/debfile.h>
a00a9b44	23
b2e465d6	24	#include <netinet/in.h> // htonl, etc
453b82a3 DK	25	#include <ctype.h>
	26	#include <stddef.h>
	27	#include <sys/stat.h>
ea542140	28
ea542140	29	#include "cachedb.h"
a00a9b44 DK	30
a00a9b44 DK	31	#include <apti18n.h>
b2e465d6 AL	32	/}}}/
	33
	34	// CacheDB::ReadyDB - Ready the DB2 /{{{/
	35	// ---------------------------------------------------------------------
	36	/* This opens the DB2 file for caching package information */
8f3ba4e8	37	bool CacheDB::ReadyDB(std::string const &DB)
b2e465d6	38	{
c9569a1e AL	39	int err;
c9569a1e AL	40
b2e465d6 AL	41	ReadOnly = _config->FindB("APT::FTPArchive::ReadOnlyDB",false);
	42
	43	// Close the old DB
	44	if (Dbp != 0)
	45	Dbp->close(Dbp,0);
	46
	47	/* Check if the DB was disabled while running and deal with a
	48	corrupted DB */
	49	if (DBFailed() == true)
	50	{
dc738e7a	51	_error->Warning(_("DB was corrupted, file renamed to %s.old"),DBFile.c_str());
b2e465d6 AL	52	rename(DBFile.c_str(),(DBFile+".old").c_str());
	53	}
	54
	55	DBLoaded = false;
	56	Dbp = 0;
8f3ba4e8	57	DBFile = std::string();
b2e465d6 AL	58
	59	if (DB.empty())
	60	return true;
c9569a1e AL	61
c9569a1e AL	62	db_create(&Dbp, NULL, 0);
cde41ae8	63	if ((err = Dbp->open(Dbp, NULL, DB.c_str(), NULL, DB_BTREE,
b2e465d6	64	(ReadOnly?DB_RDONLY:DB_CREATE),
c9569a1e	65	0644)) != 0)
b2e465d6	66	{
c9569a1e AL	67	if (err == DB_OLD_VERSION)
	68	{
	69	_error->Warning(_("DB is old, attempting to upgrade %s"),DBFile.c_str());
	70	err = Dbp->upgrade(Dbp, DB.c_str(), 0);
	71	if (!err)
	72	err = Dbp->open(Dbp, NULL, DB.c_str(), NULL, DB_HASH,
	73	(ReadOnly?DB_RDONLY:DB_CREATE), 0644);
	74
	75	}
eb2bc4f2 MV	76	// the database format has changed from DB_HASH to DB_BTREE in
	77	// apt 0.6.44
	78	if (err == EINVAL)
	79	{
c6474fb6	80	_error->Error(_("DB format is invalid. If you upgraded from an older version of apt, please remove and re-create the database."));
eb2bc4f2	81	}
c9569a1e AL	82	if (err)
	83	{
	84	Dbp = 0;
	85	return _error->Error(_("Unable to open DB file %s: %s"),DB.c_str(), db_strerror(err));
	86	}
b2e465d6 AL	87	}
	88
	89	DBFile = DB;
	90	DBLoaded = true;
	91	return true;
	92	}
	93	/}}}/
c6474fb6	94	// CacheDB::OpenFile - Open the file /{{{/
b2e465d6	95	// ---------------------------------------------------------------------
cde41ae8 MV	96	/* */
	97	bool CacheDB::OpenFile()
	98	{
	99	Fd = new FileFd(FileName,FileFd::ReadOnly);
	100	if (_error->PendingError() == true)
	101	{
	102	delete Fd;
	103	Fd = NULL;
	104	return false;
	105	}
	106	return true;
	107	}
	108	/}}}/
	109	// CacheDB::GetFileStat - Get stats from the file /{{{/
	110	// ---------------------------------------------------------------------
	111	/* This gets the size from the database if it's there. If we need
	112	* to look at the file, also get the mtime from the file. */
ff574e76	113	bool CacheDB::GetFileStat(bool const &doStat)
cde41ae8	114	{
ff574e76	115	if ((CurStat.Flags & FlSize) == FlSize && doStat == false)
cde41ae8 MV	116	{
	117	/* Already worked out the file size */
	118	}
	119	else
	120	{
	121	/* Get it from the file. */
	122	if (Fd == NULL && OpenFile() == false)
	123	{
	124	return false;
	125	}
	126	// Stat the file
	127	struct stat St;
	128	if (fstat(Fd->Fd(),&St) != 0)
	129	{
	130	return _error->Errno("fstat",
	131	_("Failed to stat %s"),FileName.c_str());
	132	}
	133	CurStat.FileSize = St.st_size;
	134	CurStat.mtime = htonl(St.st_mtime);
	135	CurStat.Flags \|= FlSize;
	136	}
	137	return true;
	138	}
	139	/}}}/
	140	// CacheDB::GetCurStat - Set the CurStat variable. /{{{/
	141	// ---------------------------------------------------------------------
	142	/* Sets the CurStat variable. Either to 0 if no database is used
	143	* or to the value in the database if one is used */
	144	bool CacheDB::GetCurStat()
b2e465d6	145	{
b2e465d6 AL	146	memset(&CurStat,0,sizeof(CurStat));
b2e465d6 AL	147
cde41ae8 MV	148	if (DBLoaded)
cde41ae8 MV	149	{
c6474fb6	150	/* First see if there is anything about it
cde41ae8	151	in the database */
b2e465d6	152
cde41ae8	153	/* Get the flags (and mtime) */
b2e465d6	154	InitQuery("st");
b2e465d6 AL	155	// Ensure alignment of the returned structure
	156	Data.data = &CurStat;
	157	Data.ulen = sizeof(CurStat);
	158	Data.flags = DB_DBT_USERMEM;
cde41ae8	159	if (Get() == false)
b2e465d6	160	{
b2e465d6	161	CurStat.Flags = 0;
b2e465d6	162	}
cde41ae8 MV	163	CurStat.Flags = ntohl(CurStat.Flags);
cde41ae8 MV	164	CurStat.FileSize = ntohl(CurStat.FileSize);
b2e465d6	165	}
cde41ae8 MV	166	return true;
	167	}
	168	/}}}/
	169	// CacheDB::GetFileInfo - Get all the info about the file /{{{/
	170	// ---------------------------------------------------------------------
8f3ba4e8	171	bool CacheDB::GetFileInfo(std::string const &FileName, bool const &DoControl, bool const &DoContents,
9209ec47	172	bool const &GenContentsOnly, bool const &DoMD5, bool const &DoSHA1,
9a961efc MV	173	bool const &DoSHA256, bool const &DoSHA512,
9a961efc MV	174	bool const &checkMtime)
cde41ae8 MV	175	{
	176	this->FileName = FileName;
	177
	178	if (GetCurStat() == false)
b2e465d6	179	{
cde41ae8	180	return false;
b2e465d6	181	}
b2e465d6	182	OldStat = CurStat;
ff574e76 DK	183
ff574e76 DK	184	if (GetFileStat(checkMtime) == false)
cde41ae8 MV	185	{
	186	delete Fd;
	187	Fd = NULL;
	188	return false;
	189	}
	190
ff574e76 DK	191	/* if mtime changed, update CurStat from disk */
	192	if (checkMtime == true && OldStat.mtime != CurStat.mtime)
	193	CurStat.Flags = FlSize;
	194
cde41ae8 MV	195	Stats.Bytes += CurStat.FileSize;
	196	Stats.Packages++;
	197
2a5f8389 DK	198	if ((DoControl && LoadControl() == false)
	199	\|\| (DoContents && LoadContents(GenContentsOnly) == false)
	200	\|\| (DoMD5 && GetMD5(false) == false)
	201	\|\| (DoSHA1 && GetSHA1(false) == false)
9a961efc MV	202	\|\| (DoSHA256 && GetSHA256(false) == false)
	203	\|\| (DoSHA512 && GetSHA512(false) == false)
	204	)
cde41ae8 MV	205	{
	206	delete Fd;
	207	Fd = NULL;
	208	delete DebFile;
	209	DebFile = NULL;
	210	return false;
	211	}
	212
	213	delete Fd;
	214	Fd = NULL;
	215	delete DebFile;
	216	DebFile = NULL;
	217
b2e465d6 AL	218	return true;
	219	}
	220	/}}}/
	221	// CacheDB::LoadControl - Load Control information /{{{/
	222	// ---------------------------------------------------------------------
	223	/* */
	224	bool CacheDB::LoadControl()
	225	{
	226	// Try to read the control information out of the DB.
	227	if ((CurStat.Flags & FlControl) == FlControl)
	228	{
	229	// Lookup the control information
	230	InitQuery("cl");
	231	if (Get() == true && Control.TakeControl(Data.data,Data.size) == true)
	232	return true;
	233	CurStat.Flags &= ~FlControl;
	234	}
	235
cde41ae8 MV	236	if (Fd == NULL && OpenFile() == false)
	237	{
	238	return false;
	239	}
b2e465d6 AL	240	// Create a deb instance to read the archive
	241	if (DebFile == 0)
	242	{
	243	DebFile = new debDebFile(*Fd);
	244	if (_error->PendingError() == true)
	245	return false;
	246	}
	247
	248	Stats.Misses++;
	249	if (Control.Read(*DebFile) == false)
	250	return false;
	251
	252	if (Control.Control == 0)
dc738e7a	253	return _error->Error(_("Archive has no control record"));
b2e465d6 AL	254
	255	// Write back the control information
	256	InitQuery("cl");
	257	if (Put(Control.Control,Control.Length) == true)
	258	CurStat.Flags \|= FlControl;
	259	return true;
	260	}
	261	/}}}/
	262	// CacheDB::LoadContents - Load the File Listing /{{{/
	263	// ---------------------------------------------------------------------
	264	/* */
9209ec47	265	bool CacheDB::LoadContents(bool const &GenOnly)
b2e465d6 AL	266	{
	267	// Try to read the control information out of the DB.
	268	if ((CurStat.Flags & FlContents) == FlContents)
	269	{
	270	if (GenOnly == true)
	271	return true;
	272
	273	// Lookup the contents information
	274	InitQuery("cn");
	275	if (Get() == true)
	276	{
	277	if (Contents.TakeContents(Data.data,Data.size) == true)
	278	return true;
	279	}
	280
	281	CurStat.Flags &= ~FlContents;
	282	}
	283
cde41ae8 MV	284	if (Fd == NULL && OpenFile() == false)
	285	{
	286	return false;
	287	}
b2e465d6 AL	288	// Create a deb instance to read the archive
	289	if (DebFile == 0)
	290	{
	291	DebFile = new debDebFile(*Fd);
	292	if (_error->PendingError() == true)
	293	return false;
	294	}
	295
	296	if (Contents.Read(*DebFile) == false)
	297	return false;
	298
	299	// Write back the control information
	300	InitQuery("cn");
	301	if (Put(Contents.Data,Contents.CurSize) == true)
	302	CurStat.Flags \|= FlContents;
	303	return true;
	304	}
	305	/}}}/
cde41ae8	306
8f3ba4e8	307	static std::string bytes2hex(uint8_t *bytes, size_t length) {
76ef756a	308	char buf[3];
0fffbc8c	309	std::string space;
76ef756a MV	310
	311	space.reserve(length*2 + 1);
	312	for (size_t i = 0; i < length; i++) {
	313	snprintf(buf, sizeof(buf), "%02x", bytes[i]);
	314	space.append(buf);
	315	}
	316	return space;
cde41ae8 MV	317	}
cde41ae8 MV	318
9209ec47	319	static inline unsigned char xdig2num(char const &dig) {
cde41ae8 MV	320	if (isdigit(dig)) return dig - '0';
	321	if ('a' <= dig && dig <= 'f') return dig - 'a' + 10;
	322	if ('A' <= dig && dig <= 'F') return dig - 'A' + 10;
	323	return 0;
	324	}
	325
	326	static void hex2bytes(uint8_t bytes, const char hex, int length) {
	327	while (length-- > 0) {
	328	*bytes = 0;
	329	if (isxdigit(hex[0]) && isxdigit(hex[1])) {
	330	bytes = xdig2num(hex[0]) 16 + xdig2num(hex[1]);
	331	hex += 2;
	332	}
	333	bytes++;
	334	}
	335	}
	336
b2e465d6 AL	337	// CacheDB::GetMD5 - Get the MD5 hash /{{{/
	338	// ---------------------------------------------------------------------
	339	/* */
9209ec47	340	bool CacheDB::GetMD5(bool const &GenOnly)
b2e465d6 AL	341	{
	342	// Try to read the control information out of the DB.
	343	if ((CurStat.Flags & FlMD5) == FlMD5)
	344	{
	345	if (GenOnly == true)
	346	return true;
	347
cde41ae8	348	MD5Res = bytes2hex(CurStat.MD5, sizeof(CurStat.MD5));
b2e465d6 AL	349	return true;
b2e465d6 AL	350	}
b2e465d6	351
cde41ae8	352	Stats.MD5Bytes += CurStat.FileSize;
b2e465d6	353
cde41ae8 MV	354	if (Fd == NULL && OpenFile() == false)
	355	{
	356	return false;
	357	}
b2e465d6	358	MD5Summation MD5;
109eb151	359	if (Fd->Seek(0) == false \|\| MD5.AddFD(*Fd, CurStat.FileSize) == false)
b2e465d6 AL	360	return false;
	361
	362	MD5Res = MD5.Result();
cde41ae8	363	hex2bytes(CurStat.MD5, MD5Res.data(), sizeof(CurStat.MD5));
b2e465d6 AL	364	CurStat.Flags \|= FlMD5;
	365	return true;
	366	}
	367	/}}}/
cde41ae8 MV	368	// CacheDB::GetSHA1 - Get the SHA1 hash /{{{/
	369	// ---------------------------------------------------------------------
	370	/* */
9209ec47	371	bool CacheDB::GetSHA1(bool const &GenOnly)
cde41ae8 MV	372	{
	373	// Try to read the control information out of the DB.
	374	if ((CurStat.Flags & FlSHA1) == FlSHA1)
	375	{
	376	if (GenOnly == true)
	377	return true;
	378
	379	SHA1Res = bytes2hex(CurStat.SHA1, sizeof(CurStat.SHA1));
	380	return true;
	381	}
	382
	383	Stats.SHA1Bytes += CurStat.FileSize;
	384
	385	if (Fd == NULL && OpenFile() == false)
	386	{
	387	return false;
	388	}
	389	SHA1Summation SHA1;
109eb151	390	if (Fd->Seek(0) == false \|\| SHA1.AddFD(*Fd, CurStat.FileSize) == false)
cde41ae8 MV	391	return false;
	392
	393	SHA1Res = SHA1.Result();
	394	hex2bytes(CurStat.SHA1, SHA1Res.data(), sizeof(CurStat.SHA1));
	395	CurStat.Flags \|= FlSHA1;
	396	return true;
	397	}
	398	/}}}/
	399	// CacheDB::GetSHA256 - Get the SHA256 hash /{{{/
	400	// ---------------------------------------------------------------------
	401	/* */
9209ec47	402	bool CacheDB::GetSHA256(bool const &GenOnly)
cde41ae8 MV	403	{
	404	// Try to read the control information out of the DB.
	405	if ((CurStat.Flags & FlSHA256) == FlSHA256)
	406	{
	407	if (GenOnly == true)
	408	return true;
	409
	410	SHA256Res = bytes2hex(CurStat.SHA256, sizeof(CurStat.SHA256));
	411	return true;
	412	}
	413
	414	Stats.SHA256Bytes += CurStat.FileSize;
	415
	416	if (Fd == NULL && OpenFile() == false)
	417	{
	418	return false;
	419	}
	420	SHA256Summation SHA256;
109eb151	421	if (Fd->Seek(0) == false \|\| SHA256.AddFD(*Fd, CurStat.FileSize) == false)
cde41ae8 MV	422	return false;
	423
	424	SHA256Res = SHA256.Result();
	425	hex2bytes(CurStat.SHA256, SHA256Res.data(), sizeof(CurStat.SHA256));
	426	CurStat.Flags \|= FlSHA256;
	427	return true;
	428	}
	429	/}}}/
9a961efc MV	430	// CacheDB::GetSHA256 - Get the SHA256 hash /{{{/
	431	// ---------------------------------------------------------------------
	432	/* */
	433	bool CacheDB::GetSHA512(bool const &GenOnly)
	434	{
	435	// Try to read the control information out of the DB.
	436	if ((CurStat.Flags & FlSHA512) == FlSHA512)
	437	{
	438	if (GenOnly == true)
	439	return true;
	440
	441	SHA512Res = bytes2hex(CurStat.SHA512, sizeof(CurStat.SHA512));
	442	return true;
	443	}
	444
	445	Stats.SHA512Bytes += CurStat.FileSize;
	446
	447	if (Fd == NULL && OpenFile() == false)
	448	{
	449	return false;
	450	}
	451	SHA512Summation SHA512;
109eb151	452	if (Fd->Seek(0) == false \|\| SHA512.AddFD(*Fd, CurStat.FileSize) == false)
9a961efc MV	453	return false;
	454
	455	SHA512Res = SHA512.Result();
	456	hex2bytes(CurStat.SHA512, SHA512Res.data(), sizeof(CurStat.SHA512));
	457	CurStat.Flags \|= FlSHA512;
	458	return true;
	459	}
	460	/}}}/
b2e465d6 AL	461	// CacheDB::Finish - Write back the cache structure /{{{/
	462	// ---------------------------------------------------------------------
	463	/* */
	464	bool CacheDB::Finish()
	465	{
	466	// Optimize away some writes.
	467	if (CurStat.Flags == OldStat.Flags &&
9bfe66dc	468	CurStat.mtime == OldStat.mtime)
b2e465d6 AL	469	return true;
	470
	471	// Write the stat information
	472	CurStat.Flags = htonl(CurStat.Flags);
cde41ae8	473	CurStat.FileSize = htonl(CurStat.FileSize);
b2e465d6 AL	474	InitQuery("st");
	475	Put(&CurStat,sizeof(CurStat));
	476	CurStat.Flags = ntohl(CurStat.Flags);
cde41ae8 MV	477	CurStat.FileSize = ntohl(CurStat.FileSize);
cde41ae8 MV	478
b2e465d6 AL	479	return true;
	480	}
	481	/}}}/
	482	// CacheDB::Clean - Clean the Database /{{{/
	483	// ---------------------------------------------------------------------
	484	/* Tidy the database by removing files that no longer exist at all. */
	485	bool CacheDB::Clean()
	486	{
	487	if (DBLoaded == false)
	488	return true;
	489
	490	/* I'm not sure what VERSION_MINOR should be here.. 2.4.14 certainly
	491	needs the lower one and 2.7.7 needs the upper.. */
b2e465d6	492	DBC *Cursor;
c9569a1e	493	if ((errno = Dbp->cursor(Dbp, NULL, &Cursor, 0)) != 0)
dc738e7a	494	return _error->Error(_("Unable to get a cursor"));
b2e465d6 AL	495
	496	DBT Key;
	497	DBT Data;
	498	memset(&Key,0,sizeof(Key));
	499	memset(&Data,0,sizeof(Data));
	500	while ((errno = Cursor->c_get(Cursor,&Key,&Data,DB_NEXT)) == 0)
	501	{
592b401a MV	502	const char Colon = (char)memrchr(Key.data, ':', Key.size);
592b401a MV	503	if (Colon)
b2e465d6	504	{
592b401a MV	505	if (stringcmp(Colon + 1, (char *)Key.data+Key.size,"st") == 0 \|\|
	506	stringcmp(Colon + 1, (char *)Key.data+Key.size,"cl") == 0 \|\|
	507	stringcmp(Colon + 1, (char *)Key.data+Key.size,"cn") == 0)
b2e465d6	508	{
8f3ba4e8	509	if (FileExists(std::string((const char *)Key.data,Colon)) == true)
b2e465d6 AL	510	continue;
	511	}
	512	}
	513
	514	Cursor->c_del(Cursor,0);
	515	}
09fab244	516	Dbp->compact(Dbp, NULL, NULL, NULL, NULL, DB_FREE_SPACE, NULL);
b2e465d6 AL	517
	518	return true;
	519	}
	520	/}}}/