[ntk/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 "cachedb.h"

#include <apti18n.h>
#include <apt-pkg/error.h>
#include <apt-pkg/md5.h>
#include <apt-pkg/sha1.h>
#include <apt-pkg/sha256.h>
#include <apt-pkg/sha512.h>
#include <apt-pkg/strutl.h>
#include <apt-pkg/configuration.h>
    
#include <netinet/in.h>       // htonl, etc
									/*}}}*/

// 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 /{{{/
b2e465d6 AL	13	#include "cachedb.h"
b2e465d6 AL	14
dc738e7a	15	#include <apti18n.h>
b2e465d6 AL	16	#include <apt-pkg/error.h>
b2e465d6 AL	17	#include <apt-pkg/md5.h>
cde41ae8 MV	18	#include <apt-pkg/sha1.h>
cde41ae8 MV	19	#include <apt-pkg/sha256.h>
9a961efc	20	#include <apt-pkg/sha512.h>
b2e465d6 AL	21	#include <apt-pkg/strutl.h>
	22	#include <apt-pkg/configuration.h>
	23
	24	#include <netinet/in.h> // htonl, etc
	25	/}}}/
	26
	27	// CacheDB::ReadyDB - Ready the DB2 /{{{/
	28	// ---------------------------------------------------------------------
	29	/* This opens the DB2 file for caching package information */
9209ec47	30	bool CacheDB::ReadyDB(string const &DB)
b2e465d6	31	{
c9569a1e AL	32	int err;
c9569a1e AL	33
b2e465d6 AL	34	ReadOnly = _config->FindB("APT::FTPArchive::ReadOnlyDB",false);
	35
	36	// Close the old DB
	37	if (Dbp != 0)
	38	Dbp->close(Dbp,0);
	39
	40	/* Check if the DB was disabled while running and deal with a
	41	corrupted DB */
	42	if (DBFailed() == true)
	43	{
dc738e7a	44	_error->Warning(_("DB was corrupted, file renamed to %s.old"),DBFile.c_str());
b2e465d6 AL	45	rename(DBFile.c_str(),(DBFile+".old").c_str());
	46	}
	47
	48	DBLoaded = false;
	49	Dbp = 0;
	50	DBFile = string();
	51
	52	if (DB.empty())
	53	return true;
c9569a1e AL	54
c9569a1e AL	55	db_create(&Dbp, NULL, 0);
cde41ae8	56	if ((err = Dbp->open(Dbp, NULL, DB.c_str(), NULL, DB_BTREE,
b2e465d6	57	(ReadOnly?DB_RDONLY:DB_CREATE),
c9569a1e	58	0644)) != 0)
b2e465d6	59	{
c9569a1e AL	60	if (err == DB_OLD_VERSION)
	61	{
	62	_error->Warning(_("DB is old, attempting to upgrade %s"),DBFile.c_str());
	63	err = Dbp->upgrade(Dbp, DB.c_str(), 0);
	64	if (!err)
	65	err = Dbp->open(Dbp, NULL, DB.c_str(), NULL, DB_HASH,
	66	(ReadOnly?DB_RDONLY:DB_CREATE), 0644);
	67
	68	}
eb2bc4f2 MV	69	// the database format has changed from DB_HASH to DB_BTREE in
	70	// apt 0.6.44
	71	if (err == EINVAL)
	72	{
c6474fb6	73	_error->Error(_("DB format is invalid. If you upgraded from an older version of apt, please remove and re-create the database."));
eb2bc4f2	74	}
c9569a1e AL	75	if (err)
	76	{
	77	Dbp = 0;
	78	return _error->Error(_("Unable to open DB file %s: %s"),DB.c_str(), db_strerror(err));
	79	}
b2e465d6 AL	80	}
	81
	82	DBFile = DB;
	83	DBLoaded = true;
	84	return true;
	85	}
	86	/}}}/
c6474fb6	87	// CacheDB::OpenFile - Open the file /{{{/
b2e465d6	88	// ---------------------------------------------------------------------
cde41ae8 MV	89	/* */
	90	bool CacheDB::OpenFile()
	91	{
	92	Fd = new FileFd(FileName,FileFd::ReadOnly);
	93	if (_error->PendingError() == true)
	94	{
	95	delete Fd;
	96	Fd = NULL;
	97	return false;
	98	}
	99	return true;
	100	}
	101	/}}}/
	102	// CacheDB::GetFileStat - Get stats from the file /{{{/
	103	// ---------------------------------------------------------------------
	104	/* This gets the size from the database if it's there. If we need
	105	* to look at the file, also get the mtime from the file. */
ff574e76	106	bool CacheDB::GetFileStat(bool const &doStat)
cde41ae8	107	{
ff574e76	108	if ((CurStat.Flags & FlSize) == FlSize && doStat == false)
cde41ae8 MV	109	{
	110	/* Already worked out the file size */
	111	}
	112	else
	113	{
	114	/* Get it from the file. */
	115	if (Fd == NULL && OpenFile() == false)
	116	{
	117	return false;
	118	}
	119	// Stat the file
	120	struct stat St;
	121	if (fstat(Fd->Fd(),&St) != 0)
	122	{
	123	return _error->Errno("fstat",
	124	_("Failed to stat %s"),FileName.c_str());
	125	}
	126	CurStat.FileSize = St.st_size;
	127	CurStat.mtime = htonl(St.st_mtime);
	128	CurStat.Flags \|= FlSize;
	129	}
	130	return true;
	131	}
	132	/}}}/
	133	// CacheDB::GetCurStat - Set the CurStat variable. /{{{/
	134	// ---------------------------------------------------------------------
	135	/* Sets the CurStat variable. Either to 0 if no database is used
	136	* or to the value in the database if one is used */
	137	bool CacheDB::GetCurStat()
b2e465d6	138	{
b2e465d6 AL	139	memset(&CurStat,0,sizeof(CurStat));
b2e465d6 AL	140
cde41ae8 MV	141	if (DBLoaded)
cde41ae8 MV	142	{
c6474fb6	143	/* First see if there is anything about it
cde41ae8	144	in the database */
b2e465d6	145
cde41ae8	146	/* Get the flags (and mtime) */
b2e465d6	147	InitQuery("st");
b2e465d6 AL	148	// Ensure alignment of the returned structure
	149	Data.data = &CurStat;
	150	Data.ulen = sizeof(CurStat);
	151	Data.flags = DB_DBT_USERMEM;
cde41ae8	152	if (Get() == false)
b2e465d6	153	{
b2e465d6	154	CurStat.Flags = 0;
b2e465d6	155	}
cde41ae8 MV	156	CurStat.Flags = ntohl(CurStat.Flags);
cde41ae8 MV	157	CurStat.FileSize = ntohl(CurStat.FileSize);
b2e465d6	158	}
cde41ae8 MV	159	return true;
	160	}
	161	/}}}/
	162	// CacheDB::GetFileInfo - Get all the info about the file /{{{/
	163	// ---------------------------------------------------------------------
9209ec47 DK	164	bool CacheDB::GetFileInfo(string const &FileName, bool const &DoControl, bool const &DoContents,
9209ec47 DK	165	bool const &GenContentsOnly, bool const &DoMD5, bool const &DoSHA1,
9a961efc MV	166	bool const &DoSHA256, bool const &DoSHA512,
9a961efc MV	167	bool const &checkMtime)
cde41ae8 MV	168	{
	169	this->FileName = FileName;
	170
	171	if (GetCurStat() == false)
b2e465d6	172	{
cde41ae8	173	return false;
b2e465d6	174	}
b2e465d6	175	OldStat = CurStat;
ff574e76 DK	176
ff574e76 DK	177	if (GetFileStat(checkMtime) == false)
cde41ae8 MV	178	{
	179	delete Fd;
	180	Fd = NULL;
	181	return false;
	182	}
	183
ff574e76 DK	184	/* if mtime changed, update CurStat from disk */
	185	if (checkMtime == true && OldStat.mtime != CurStat.mtime)
	186	CurStat.Flags = FlSize;
	187
cde41ae8 MV	188	Stats.Bytes += CurStat.FileSize;
	189	Stats.Packages++;
	190
2a5f8389 DK	191	if ((DoControl && LoadControl() == false)
	192	\|\| (DoContents && LoadContents(GenContentsOnly) == false)
	193	\|\| (DoMD5 && GetMD5(false) == false)
	194	\|\| (DoSHA1 && GetSHA1(false) == false)
9a961efc MV	195	\|\| (DoSHA256 && GetSHA256(false) == false)
	196	\|\| (DoSHA512 && GetSHA512(false) == false)
	197	)
cde41ae8 MV	198	{
	199	delete Fd;
	200	Fd = NULL;
	201	delete DebFile;
	202	DebFile = NULL;
	203	return false;
	204	}
	205
	206	delete Fd;
	207	Fd = NULL;
	208	delete DebFile;
	209	DebFile = NULL;
	210
b2e465d6 AL	211	return true;
	212	}
	213	/}}}/
	214	// CacheDB::LoadControl - Load Control information /{{{/
	215	// ---------------------------------------------------------------------
	216	/* */
	217	bool CacheDB::LoadControl()
	218	{
	219	// Try to read the control information out of the DB.
	220	if ((CurStat.Flags & FlControl) == FlControl)
	221	{
	222	// Lookup the control information
	223	InitQuery("cl");
	224	if (Get() == true && Control.TakeControl(Data.data,Data.size) == true)
	225	return true;
	226	CurStat.Flags &= ~FlControl;
	227	}
	228
cde41ae8 MV	229	if (Fd == NULL && OpenFile() == false)
	230	{
	231	return false;
	232	}
b2e465d6 AL	233	// Create a deb instance to read the archive
	234	if (DebFile == 0)
	235	{
	236	DebFile = new debDebFile(*Fd);
	237	if (_error->PendingError() == true)
	238	return false;
	239	}
	240
	241	Stats.Misses++;
	242	if (Control.Read(*DebFile) == false)
	243	return false;
	244
	245	if (Control.Control == 0)
dc738e7a	246	return _error->Error(_("Archive has no control record"));
b2e465d6 AL	247
	248	// Write back the control information
	249	InitQuery("cl");
	250	if (Put(Control.Control,Control.Length) == true)
	251	CurStat.Flags \|= FlControl;
	252	return true;
	253	}
	254	/}}}/
	255	// CacheDB::LoadContents - Load the File Listing /{{{/
	256	// ---------------------------------------------------------------------
	257	/* */
9209ec47	258	bool CacheDB::LoadContents(bool const &GenOnly)
b2e465d6 AL	259	{
	260	// Try to read the control information out of the DB.
	261	if ((CurStat.Flags & FlContents) == FlContents)
	262	{
	263	if (GenOnly == true)
	264	return true;
	265
	266	// Lookup the contents information
	267	InitQuery("cn");
	268	if (Get() == true)
	269	{
	270	if (Contents.TakeContents(Data.data,Data.size) == true)
	271	return true;
	272	}
	273
	274	CurStat.Flags &= ~FlContents;
	275	}
	276
cde41ae8 MV	277	if (Fd == NULL && OpenFile() == false)
	278	{
	279	return false;
	280	}
b2e465d6 AL	281	// Create a deb instance to read the archive
	282	if (DebFile == 0)
	283	{
	284	DebFile = new debDebFile(*Fd);
	285	if (_error->PendingError() == true)
	286	return false;
	287	}
	288
	289	if (Contents.Read(*DebFile) == false)
	290	return false;
	291
	292	// Write back the control information
	293	InitQuery("cn");
	294	if (Put(Contents.Data,Contents.CurSize) == true)
	295	CurStat.Flags \|= FlContents;
	296	return true;
	297	}
	298	/}}}/
cde41ae8 MV	299
	300	static string bytes2hex(uint8_t *bytes, size_t length) {
	301	char space[65];
	302	if (length * 2 > sizeof(space) - 1) length = (sizeof(space) - 1) / 2;
	303	for (size_t i = 0; i < length; i++)
	304	snprintf(&space[i*2], 3, "%02x", bytes[i]);
	305	return string(space);
	306	}
	307
9209ec47	308	static inline unsigned char xdig2num(char const &dig) {
cde41ae8 MV	309	if (isdigit(dig)) return dig - '0';
	310	if ('a' <= dig && dig <= 'f') return dig - 'a' + 10;
	311	if ('A' <= dig && dig <= 'F') return dig - 'A' + 10;
	312	return 0;
	313	}
	314
	315	static void hex2bytes(uint8_t bytes, const char hex, int length) {
	316	while (length-- > 0) {
	317	*bytes = 0;
	318	if (isxdigit(hex[0]) && isxdigit(hex[1])) {
	319	bytes = xdig2num(hex[0]) 16 + xdig2num(hex[1]);
	320	hex += 2;
	321	}
	322	bytes++;
	323	}
	324	}
	325
b2e465d6 AL	326	// CacheDB::GetMD5 - Get the MD5 hash /{{{/
	327	// ---------------------------------------------------------------------
	328	/* */
9209ec47	329	bool CacheDB::GetMD5(bool const &GenOnly)
b2e465d6 AL	330	{
	331	// Try to read the control information out of the DB.
	332	if ((CurStat.Flags & FlMD5) == FlMD5)
	333	{
	334	if (GenOnly == true)
	335	return true;
	336
cde41ae8	337	MD5Res = bytes2hex(CurStat.MD5, sizeof(CurStat.MD5));
b2e465d6 AL	338	return true;
b2e465d6 AL	339	}
b2e465d6	340
cde41ae8	341	Stats.MD5Bytes += CurStat.FileSize;
b2e465d6	342
cde41ae8 MV	343	if (Fd == NULL && OpenFile() == false)
	344	{
	345	return false;
	346	}
b2e465d6	347	MD5Summation MD5;
cde41ae8	348	if (Fd->Seek(0) == false \|\| MD5.AddFD(Fd->Fd(),CurStat.FileSize) == false)
b2e465d6 AL	349	return false;
	350
	351	MD5Res = MD5.Result();
cde41ae8	352	hex2bytes(CurStat.MD5, MD5Res.data(), sizeof(CurStat.MD5));
b2e465d6 AL	353	CurStat.Flags \|= FlMD5;
	354	return true;
	355	}
	356	/}}}/
cde41ae8 MV	357	// CacheDB::GetSHA1 - Get the SHA1 hash /{{{/
	358	// ---------------------------------------------------------------------
	359	/* */
9209ec47	360	bool CacheDB::GetSHA1(bool const &GenOnly)
cde41ae8 MV	361	{
	362	// Try to read the control information out of the DB.
	363	if ((CurStat.Flags & FlSHA1) == FlSHA1)
	364	{
	365	if (GenOnly == true)
	366	return true;
	367
	368	SHA1Res = bytes2hex(CurStat.SHA1, sizeof(CurStat.SHA1));
	369	return true;
	370	}
	371
	372	Stats.SHA1Bytes += CurStat.FileSize;
	373
	374	if (Fd == NULL && OpenFile() == false)
	375	{
	376	return false;
	377	}
	378	SHA1Summation SHA1;
	379	if (Fd->Seek(0) == false \|\| SHA1.AddFD(Fd->Fd(),CurStat.FileSize) == false)
	380	return false;
	381
	382	SHA1Res = SHA1.Result();
	383	hex2bytes(CurStat.SHA1, SHA1Res.data(), sizeof(CurStat.SHA1));
	384	CurStat.Flags \|= FlSHA1;
	385	return true;
	386	}
	387	/}}}/
	388	// CacheDB::GetSHA256 - Get the SHA256 hash /{{{/
	389	// ---------------------------------------------------------------------
	390	/* */
9209ec47	391	bool CacheDB::GetSHA256(bool const &GenOnly)
cde41ae8 MV	392	{
	393	// Try to read the control information out of the DB.
	394	if ((CurStat.Flags & FlSHA256) == FlSHA256)
	395	{
	396	if (GenOnly == true)
	397	return true;
	398
	399	SHA256Res = bytes2hex(CurStat.SHA256, sizeof(CurStat.SHA256));
	400	return true;
	401	}
	402
	403	Stats.SHA256Bytes += CurStat.FileSize;
	404
	405	if (Fd == NULL && OpenFile() == false)
	406	{
	407	return false;
	408	}
	409	SHA256Summation SHA256;
	410	if (Fd->Seek(0) == false \|\| SHA256.AddFD(Fd->Fd(),CurStat.FileSize) == false)
	411	return false;
	412
	413	SHA256Res = SHA256.Result();
	414	hex2bytes(CurStat.SHA256, SHA256Res.data(), sizeof(CurStat.SHA256));
	415	CurStat.Flags \|= FlSHA256;
	416	return true;
	417	}
	418	/}}}/
9a961efc MV	419	// CacheDB::GetSHA256 - Get the SHA256 hash /{{{/
	420	// ---------------------------------------------------------------------
	421	/* */
	422	bool CacheDB::GetSHA512(bool const &GenOnly)
	423	{
	424	// Try to read the control information out of the DB.
	425	if ((CurStat.Flags & FlSHA512) == FlSHA512)
	426	{
	427	if (GenOnly == true)
	428	return true;
	429
	430	SHA512Res = bytes2hex(CurStat.SHA512, sizeof(CurStat.SHA512));
	431	return true;
	432	}
	433
	434	Stats.SHA512Bytes += CurStat.FileSize;
	435
	436	if (Fd == NULL && OpenFile() == false)
	437	{
	438	return false;
	439	}
	440	SHA512Summation SHA512;
	441	if (Fd->Seek(0) == false \|\| SHA512.AddFD(Fd->Fd(),CurStat.FileSize) == false)
	442	return false;
	443
	444	SHA512Res = SHA512.Result();
	445	hex2bytes(CurStat.SHA512, SHA512Res.data(), sizeof(CurStat.SHA512));
	446	CurStat.Flags \|= FlSHA512;
	447	return true;
	448	}
	449	/}}}/
b2e465d6 AL	450	// CacheDB::Finish - Write back the cache structure /{{{/
	451	// ---------------------------------------------------------------------
	452	/* */
	453	bool CacheDB::Finish()
	454	{
	455	// Optimize away some writes.
	456	if (CurStat.Flags == OldStat.Flags &&
9bfe66dc	457	CurStat.mtime == OldStat.mtime)
b2e465d6 AL	458	return true;
	459
	460	// Write the stat information
	461	CurStat.Flags = htonl(CurStat.Flags);
cde41ae8	462	CurStat.FileSize = htonl(CurStat.FileSize);
b2e465d6 AL	463	InitQuery("st");
	464	Put(&CurStat,sizeof(CurStat));
	465	CurStat.Flags = ntohl(CurStat.Flags);
cde41ae8 MV	466	CurStat.FileSize = ntohl(CurStat.FileSize);
cde41ae8 MV	467
b2e465d6 AL	468	return true;
	469	}
	470	/}}}/
	471	// CacheDB::Clean - Clean the Database /{{{/
	472	// ---------------------------------------------------------------------
	473	/* Tidy the database by removing files that no longer exist at all. */
	474	bool CacheDB::Clean()
	475	{
	476	if (DBLoaded == false)
	477	return true;
	478
	479	/* I'm not sure what VERSION_MINOR should be here.. 2.4.14 certainly
	480	needs the lower one and 2.7.7 needs the upper.. */
b2e465d6	481	DBC *Cursor;
c9569a1e	482	if ((errno = Dbp->cursor(Dbp, NULL, &Cursor, 0)) != 0)
dc738e7a	483	return _error->Error(_("Unable to get a cursor"));
b2e465d6 AL	484
	485	DBT Key;
	486	DBT Data;
	487	memset(&Key,0,sizeof(Key));
	488	memset(&Data,0,sizeof(Data));
	489	while ((errno = Cursor->c_get(Cursor,&Key,&Data,DB_NEXT)) == 0)
	490	{
592b401a MV	491	const char Colon = (char)memrchr(Key.data, ':', Key.size);
592b401a MV	492	if (Colon)
b2e465d6	493	{
592b401a MV	494	if (stringcmp(Colon + 1, (char *)Key.data+Key.size,"st") == 0 \|\|
	495	stringcmp(Colon + 1, (char *)Key.data+Key.size,"cl") == 0 \|\|
	496	stringcmp(Colon + 1, (char *)Key.data+Key.size,"cn") == 0)
b2e465d6	497	{
592b401a	498	if (FileExists(string((const char *)Key.data,Colon)) == true)
b2e465d6 AL	499	continue;
	500	}
	501	}
	502
	503	Cursor->c_del(Cursor,0);
	504	}
09fab244	505	Dbp->compact(Dbp, NULL, NULL, NULL, NULL, DB_FREE_SPACE, NULL);
b2e465d6 AL	506
	507	return true;
	508	}
	509	/}}}/