[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 <apt-pkg/gpgv.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()
{
   // its open already
   if(Fd && Fd->Name() == this->FileName)
      return true;

   // a different file is open, close it first
   if(Fd && Fd->Name() != this->FileName)
      CloseFile();

   // open a new file
   Fd = new FileFd(FileName,FileFd::ReadOnly);
   if (_error->PendingError() == true)
   {
      CloseFile();
      return false;
   }
   return true;
}
									/*}}}*/
// CacheDB::CloseFile - Close the file					/*{{{*/
void CacheDB::CloseFile()
{
   if(Fd != NULL)
   {
      delete Fd;
      Fd = NULL;
   }
}
									/*}}}*/
// CacheDB::OpenDebFile - Open a debfile				/*{{{*/
bool CacheDB::OpenDebFile()
{
   // debfile is already open
   if(DebFile && &DebFile->GetFile() == Fd)
      return true;

   // a different debfile is open, close it first
   if(DebFile && &DebFile->GetFile() != Fd)
      CloseDebFile();

   // first open the fd, then pass it to the debDebFile
   if(OpenFile() == false)
      return false;
   DebFile = new debDebFile(*Fd);
   if (_error->PendingError() == true)
      return false;
   return true;
}
									/*}}}*/
// CacheDB::CloseDebFile - Close a debfile again 			/*{{{*/
void CacheDB::CloseDebFile()
{
   CloseFile();

   if(DebFile != NULL)
   {
      delete DebFile;
      DebFile = NULL;
   }
}
									/*}}}*/
// 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)
      return true;

   /* Get it from the file. */
   if (OpenFile() == false)
      return false;
   
   // Stat the file
   struct stat St;
   if (fstat(Fd->Fd(),&St) != 0)
   {
      CloseFile();
      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 &DoSource,
                          bool const &DoMD5, bool const &DoSHA1,
                          bool const &DoSHA256, bool const &DoSHA512, 
                          bool const &checkMtime)
{
   bool result = true;
   this->FileName = FileName;

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

   if (GetFileStat(checkMtime) == false)
      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)
       || (DoSource && LoadSource() == false)
       || (DoMD5 && GetMD5(false) == false)
       || (DoSHA1 && GetSHA1(false) == false)
       || (DoSHA256 && GetSHA256(false) == false)
       || (DoSHA512 && GetSHA512(false) == false) )
   {
      result = false;
   }
    
   return result;
}
									/*}}}*/

bool CacheDB::LoadSource()
{
   // Try to read the control information out of the DB.
   if ((CurStat.Flags & FlSource) == FlSource)
   {
      // Lookup the control information
      InitQuery("cs");
      if (Get() == true && Dsc.TakeDsc(Data.data, Data.size) == true)
	    return true;
      CurStat.Flags &= ~FlSource;
   }
   
   if (OpenFile() == false)
      return false;

   Stats.Misses++;
   if (Dsc.Read(FileName) == false)
      return false;

   if (Dsc.Data == 0)
      return _error->Error(_("Failed to read .dsc"));
   
   // Write back the control information
   InitQuery("cs");
   if (Put(Dsc.Data, Dsc.Length) == true)
      CurStat.Flags |= FlSource;

   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(OpenDebFile() == false)
      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(OpenDebFile() == false)
      return false;

   Stats.Misses++;
   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 (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 (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 (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 (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>
ce928105	23	#include <apt-pkg/gpgv.h>
a00a9b44	24
b2e465d6	25	#include <netinet/in.h> // htonl, etc
453b82a3 DK	26	#include <ctype.h>
	27	#include <stddef.h>
	28	#include <sys/stat.h>
ea542140	29
ea542140	30	#include "cachedb.h"
a00a9b44 DK	31
a00a9b44 DK	32	#include <apti18n.h>
b2e465d6 AL	33	/}}}/
	34
	35	// CacheDB::ReadyDB - Ready the DB2 /{{{/
	36	// ---------------------------------------------------------------------
	37	/* This opens the DB2 file for caching package information */
8f3ba4e8	38	bool CacheDB::ReadyDB(std::string const &DB)
b2e465d6	39	{
c9569a1e AL	40	int err;
c9569a1e AL	41
b2e465d6 AL	42	ReadOnly = _config->FindB("APT::FTPArchive::ReadOnlyDB",false);
	43
	44	// Close the old DB
	45	if (Dbp != 0)
	46	Dbp->close(Dbp,0);
	47
	48	/* Check if the DB was disabled while running and deal with a
	49	corrupted DB */
	50	if (DBFailed() == true)
	51	{
dc738e7a	52	_error->Warning(_("DB was corrupted, file renamed to %s.old"),DBFile.c_str());
b2e465d6 AL	53	rename(DBFile.c_str(),(DBFile+".old").c_str());
	54	}
	55
	56	DBLoaded = false;
	57	Dbp = 0;
8f3ba4e8	58	DBFile = std::string();
b2e465d6 AL	59
	60	if (DB.empty())
	61	return true;
c9569a1e AL	62
c9569a1e AL	63	db_create(&Dbp, NULL, 0);
cde41ae8	64	if ((err = Dbp->open(Dbp, NULL, DB.c_str(), NULL, DB_BTREE,
b2e465d6	65	(ReadOnly?DB_RDONLY:DB_CREATE),
c9569a1e	66	0644)) != 0)
b2e465d6	67	{
c9569a1e AL	68	if (err == DB_OLD_VERSION)
	69	{
	70	_error->Warning(_("DB is old, attempting to upgrade %s"),DBFile.c_str());
	71	err = Dbp->upgrade(Dbp, DB.c_str(), 0);
	72	if (!err)
	73	err = Dbp->open(Dbp, NULL, DB.c_str(), NULL, DB_HASH,
	74	(ReadOnly?DB_RDONLY:DB_CREATE), 0644);
	75
	76	}
eb2bc4f2 MV	77	// the database format has changed from DB_HASH to DB_BTREE in
	78	// apt 0.6.44
	79	if (err == EINVAL)
	80	{
c6474fb6	81	_error->Error(_("DB format is invalid. If you upgraded from an older version of apt, please remove and re-create the database."));
eb2bc4f2	82	}
c9569a1e AL	83	if (err)
	84	{
	85	Dbp = 0;
	86	return _error->Error(_("Unable to open DB file %s: %s"),DB.c_str(), db_strerror(err));
	87	}
b2e465d6 AL	88	}
	89
	90	DBFile = DB;
	91	DBLoaded = true;
	92	return true;
	93	}
	94	/}}}/
c6474fb6	95	// CacheDB::OpenFile - Open the file /{{{/
b2e465d6	96	// ---------------------------------------------------------------------
cde41ae8 MV	97	/* */
	98	bool CacheDB::OpenFile()
	99	{
215b0faf MV	100	// its open already
	101	if(Fd && Fd->Name() == this->FileName)
	102	return true;
	103
	104	// a different file is open, close it first
	105	if(Fd && Fd->Name() != this->FileName)
	106	CloseFile();
	107
	108	// open a new file
	109	Fd = new FileFd(FileName,FileFd::ReadOnly);
	110	if (_error->PendingError() == true)
	111	{
	112	CloseFile();
	113	return false;
	114	}
	115	return true;
cde41ae8 MV	116	}
cde41ae8 MV	117	/}}}/
215b0faf	118	// CacheDB::CloseFile - Close the file /{{{/
ce928105 MV	119	void CacheDB::CloseFile()
ce928105 MV	120	{
215b0faf MV	121	if(Fd != NULL)
	122	{
	123	delete Fd;
	124	Fd = NULL;
	125	}
ce928105	126	}
215b0faf MV	127	/}}}/
215b0faf MV	128	// CacheDB::OpenDebFile - Open a debfile /{{{/
ce928105 MV	129	bool CacheDB::OpenDebFile()
ce928105 MV	130	{
215b0faf MV	131	// debfile is already open
	132	if(DebFile && &DebFile->GetFile() == Fd)
	133	return true;
	134
	135	// a different debfile is open, close it first
	136	if(DebFile && &DebFile->GetFile() != Fd)
	137	CloseDebFile();
	138
	139	// first open the fd, then pass it to the debDebFile
	140	if(OpenFile() == false)
	141	return false;
ce928105 MV	142	DebFile = new debDebFile(*Fd);
	143	if (_error->PendingError() == true)
	144	return false;
	145	return true;
	146	}
215b0faf MV	147	/}}}/
215b0faf MV	148	// CacheDB::CloseDebFile - Close a debfile again /{{{/
ce928105 MV	149	void CacheDB::CloseDebFile()
ce928105 MV	150	{
215b0faf	151	CloseFile();
ce928105	152
215b0faf MV	153	if(DebFile != NULL)
	154	{
	155	delete DebFile;
	156	DebFile = NULL;
	157	}
	158	}
	159	/}}}/
cde41ae8 MV	160	// CacheDB::GetFileStat - Get stats from the file /{{{/
	161	// ---------------------------------------------------------------------
	162	/* This gets the size from the database if it's there. If we need
	163	* to look at the file, also get the mtime from the file. */
ff574e76	164	bool CacheDB::GetFileStat(bool const &doStat)
cde41ae8	165	{
215b0faf MV	166	if ((CurStat.Flags & FlSize) == FlSize && doStat == false)
	167	return true;
	168
	169	/* Get it from the file. */
	170	if (OpenFile() == false)
	171	return false;
	172
	173	// Stat the file
	174	struct stat St;
	175	if (fstat(Fd->Fd(),&St) != 0)
	176	{
	177	CloseFile();
	178	return _error->Errno("fstat",
	179	_("Failed to stat %s"),FileName.c_str());
	180	}
	181	CurStat.FileSize = St.st_size;
	182	CurStat.mtime = htonl(St.st_mtime);
	183	CurStat.Flags \|= FlSize;
	184
	185	return true;
cde41ae8 MV	186	}
	187	/}}}/
	188	// CacheDB::GetCurStat - Set the CurStat variable. /{{{/
	189	// ---------------------------------------------------------------------
	190	/* Sets the CurStat variable. Either to 0 if no database is used
	191	* or to the value in the database if one is used */
	192	bool CacheDB::GetCurStat()
b2e465d6	193	{
b2e465d6 AL	194	memset(&CurStat,0,sizeof(CurStat));
b2e465d6 AL	195
215b0faf MV	196	if (DBLoaded)
	197	{
	198	/* First see if there is anything about it
	199	in the database */
	200
	201	/* Get the flags (and mtime) */
	202	InitQuery("st");
	203	// Ensure alignment of the returned structure
	204	Data.data = &CurStat;
	205	Data.ulen = sizeof(CurStat);
	206	Data.flags = DB_DBT_USERMEM;
	207	if (Get() == false)
b2e465d6	208	{
b2e465d6	209	CurStat.Flags = 0;
b2e465d6	210	}
215b0faf MV	211	CurStat.Flags = ntohl(CurStat.Flags);
215b0faf MV	212	CurStat.FileSize = ntohl(CurStat.FileSize);
b2e465d6	213	}
215b0faf	214	return true;
cde41ae8 MV	215	}
	216	/}}}/
	217	// CacheDB::GetFileInfo - Get all the info about the file /{{{/
	218	// ---------------------------------------------------------------------
ce928105 MV	219	bool CacheDB::GetFileInfo(std::string const &FileName, bool const &DoControl,
	220	bool const &DoContents,
	221	bool const &GenContentsOnly,
	222	bool const &DoSource,
	223	bool const &DoMD5, bool const &DoSHA1,
	224	bool const &DoSHA256, bool const &DoSHA512,
9a961efc	225	bool const &checkMtime)
cde41ae8	226	{
ce928105 MV	227	bool result = true;
ce928105 MV	228	this->FileName = FileName;
cde41ae8	229
ce928105	230	if (GetCurStat() == false)
ce928105	231	return false;
b2e465d6	232	OldStat = CurStat;
ff574e76	233
ce928105	234	if (GetFileStat(checkMtime) == false)
ce928105	235	return false;
cde41ae8	236
215b0faf MV	237	/* if mtime changed, update CurStat from disk */
	238	if (checkMtime == true && OldStat.mtime != CurStat.mtime)
	239	CurStat.Flags = FlSize;
	240
	241	Stats.Bytes += CurStat.FileSize;
	242	Stats.Packages++;
	243
	244	if ((DoControl && LoadControl() == false)
	245	\|\| (DoContents && LoadContents(GenContentsOnly) == false)
	246	\|\| (DoSource && LoadSource() == false)
	247	\|\| (DoMD5 && GetMD5(false) == false)
	248	\|\| (DoSHA1 && GetSHA1(false) == false)
	249	\|\| (DoSHA256 && GetSHA256(false) == false)
	250	\|\| (DoSHA512 && GetSHA512(false) == false) )
	251	{
	252	result = false;
	253	}
ce928105	254
215b0faf	255	return result;
ce928105 MV	256	}
	257	/}}}/
	258
	259	bool CacheDB::LoadSource()
	260	{
	261	// Try to read the control information out of the DB.
	262	if ((CurStat.Flags & FlSource) == FlSource)
	263	{
	264	// Lookup the control information
	265	InitQuery("cs");
	266	if (Get() == true && Dsc.TakeDsc(Data.data, Data.size) == true)
	267	return true;
	268	CurStat.Flags &= ~FlSource;
	269	}
	270
215b0faf	271	if (OpenFile() == false)
ce928105	272	return false;
ce928105	273
ce928105 MV	274	Stats.Misses++;
	275	if (Dsc.Read(FileName) == false)
	276	return false;
cde41ae8	277
ce928105 MV	278	if (Dsc.Data == 0)
	279	return _error->Error(_("Failed to read .dsc"));
	280
	281	// Write back the control information
	282	InitQuery("cs");
	283	if (Put(Dsc.Data, Dsc.Length) == true)
	284	CurStat.Flags \|= FlSource;
cde41ae8	285
b2e465d6 AL	286	return true;
b2e465d6 AL	287	}
ce928105	288
b2e465d6 AL	289	// CacheDB::LoadControl - Load Control information /{{{/
	290	// ---------------------------------------------------------------------
	291	/* */
	292	bool CacheDB::LoadControl()
	293	{
	294	// Try to read the control information out of the DB.
	295	if ((CurStat.Flags & FlControl) == FlControl)
	296	{
	297	// Lookup the control information
	298	InitQuery("cl");
	299	if (Get() == true && Control.TakeControl(Data.data,Data.size) == true)
	300	return true;
	301	CurStat.Flags &= ~FlControl;
	302	}
	303
215b0faf	304	if(OpenDebFile() == false)
cde41ae8	305	return false;
b2e465d6 AL	306
	307	Stats.Misses++;
	308	if (Control.Read(*DebFile) == false)
	309	return false;
	310
	311	if (Control.Control == 0)
dc738e7a	312	return _error->Error(_("Archive has no control record"));
b2e465d6 AL	313
	314	// Write back the control information
	315	InitQuery("cl");
	316	if (Put(Control.Control,Control.Length) == true)
	317	CurStat.Flags \|= FlControl;
	318	return true;
	319	}
	320	/}}}/
	321	// CacheDB::LoadContents - Load the File Listing /{{{/
	322	// ---------------------------------------------------------------------
	323	/* */
9209ec47	324	bool CacheDB::LoadContents(bool const &GenOnly)
b2e465d6 AL	325	{
	326	// Try to read the control information out of the DB.
	327	if ((CurStat.Flags & FlContents) == FlContents)
	328	{
	329	if (GenOnly == true)
	330	return true;
	331
	332	// Lookup the contents information
	333	InitQuery("cn");
	334	if (Get() == true)
	335	{
	336	if (Contents.TakeContents(Data.data,Data.size) == true)
	337	return true;
	338	}
	339
	340	CurStat.Flags &= ~FlContents;
	341	}
	342
215b0faf	343	if(OpenDebFile() == false)
cde41ae8	344	return false;
b2e465d6	345
0a3b93fc	346	Stats.Misses++;
b2e465d6 AL	347	if (Contents.Read(*DebFile) == false)
	348	return false;
	349
	350	// Write back the control information
	351	InitQuery("cn");
	352	if (Put(Contents.Data,Contents.CurSize) == true)
	353	CurStat.Flags \|= FlContents;
	354	return true;
	355	}
	356	/}}}/
cde41ae8	357
8f3ba4e8	358	static std::string bytes2hex(uint8_t *bytes, size_t length) {
76ef756a	359	char buf[3];
0fffbc8c	360	std::string space;
76ef756a MV	361
	362	space.reserve(length*2 + 1);
	363	for (size_t i = 0; i < length; i++) {
	364	snprintf(buf, sizeof(buf), "%02x", bytes[i]);
	365	space.append(buf);
	366	}
	367	return space;
cde41ae8 MV	368	}
cde41ae8 MV	369
9209ec47	370	static inline unsigned char xdig2num(char const &dig) {
cde41ae8 MV	371	if (isdigit(dig)) return dig - '0';
	372	if ('a' <= dig && dig <= 'f') return dig - 'a' + 10;
	373	if ('A' <= dig && dig <= 'F') return dig - 'A' + 10;
	374	return 0;
	375	}
	376
	377	static void hex2bytes(uint8_t bytes, const char hex, int length) {
	378	while (length-- > 0) {
	379	*bytes = 0;
	380	if (isxdigit(hex[0]) && isxdigit(hex[1])) {
	381	bytes = xdig2num(hex[0]) 16 + xdig2num(hex[1]);
	382	hex += 2;
	383	}
	384	bytes++;
	385	}
	386	}
	387
b2e465d6 AL	388	// CacheDB::GetMD5 - Get the MD5 hash /{{{/
	389	// ---------------------------------------------------------------------
	390	/* */
9209ec47	391	bool CacheDB::GetMD5(bool const &GenOnly)
b2e465d6 AL	392	{
	393	// Try to read the control information out of the DB.
	394	if ((CurStat.Flags & FlMD5) == FlMD5)
	395	{
	396	if (GenOnly == true)
	397	return true;
	398
cde41ae8	399	MD5Res = bytes2hex(CurStat.MD5, sizeof(CurStat.MD5));
b2e465d6	400	return true;
215b0faf	401	}
b2e465d6	402
cde41ae8	403	Stats.MD5Bytes += CurStat.FileSize;
b2e465d6	404
215b0faf	405	if (OpenFile() == false)
cde41ae8	406	return false;
215b0faf	407
b2e465d6	408	MD5Summation MD5;
109eb151	409	if (Fd->Seek(0) == false \|\| MD5.AddFD(*Fd, CurStat.FileSize) == false)
b2e465d6 AL	410	return false;
	411
	412	MD5Res = MD5.Result();
cde41ae8	413	hex2bytes(CurStat.MD5, MD5Res.data(), sizeof(CurStat.MD5));
b2e465d6 AL	414	CurStat.Flags \|= FlMD5;
	415	return true;
	416	}
	417	/}}}/
cde41ae8 MV	418	// CacheDB::GetSHA1 - Get the SHA1 hash /{{{/
	419	// ---------------------------------------------------------------------
	420	/* */
9209ec47	421	bool CacheDB::GetSHA1(bool const &GenOnly)
cde41ae8 MV	422	{
	423	// Try to read the control information out of the DB.
	424	if ((CurStat.Flags & FlSHA1) == FlSHA1)
	425	{
	426	if (GenOnly == true)
	427	return true;
	428
	429	SHA1Res = bytes2hex(CurStat.SHA1, sizeof(CurStat.SHA1));
	430	return true;
	431	}
	432
	433	Stats.SHA1Bytes += CurStat.FileSize;
	434
215b0faf	435	if (OpenFile() == false)
cde41ae8	436	return false;
215b0faf	437
cde41ae8	438	SHA1Summation SHA1;
109eb151	439	if (Fd->Seek(0) == false \|\| SHA1.AddFD(*Fd, CurStat.FileSize) == false)
cde41ae8 MV	440	return false;
	441
	442	SHA1Res = SHA1.Result();
	443	hex2bytes(CurStat.SHA1, SHA1Res.data(), sizeof(CurStat.SHA1));
	444	CurStat.Flags \|= FlSHA1;
	445	return true;
	446	}
	447	/}}}/
	448	// CacheDB::GetSHA256 - Get the SHA256 hash /{{{/
	449	// ---------------------------------------------------------------------
	450	/* */
9209ec47	451	bool CacheDB::GetSHA256(bool const &GenOnly)
cde41ae8 MV	452	{
	453	// Try to read the control information out of the DB.
	454	if ((CurStat.Flags & FlSHA256) == FlSHA256)
	455	{
	456	if (GenOnly == true)
	457	return true;
	458
	459	SHA256Res = bytes2hex(CurStat.SHA256, sizeof(CurStat.SHA256));
	460	return true;
	461	}
	462
	463	Stats.SHA256Bytes += CurStat.FileSize;
	464
215b0faf	465	if (OpenFile() == false)
cde41ae8	466	return false;
215b0faf	467
cde41ae8	468	SHA256Summation SHA256;
109eb151	469	if (Fd->Seek(0) == false \|\| SHA256.AddFD(*Fd, CurStat.FileSize) == false)
cde41ae8 MV	470	return false;
	471
	472	SHA256Res = SHA256.Result();
	473	hex2bytes(CurStat.SHA256, SHA256Res.data(), sizeof(CurStat.SHA256));
	474	CurStat.Flags \|= FlSHA256;
	475	return true;
	476	}
	477	/}}}/
9a961efc MV	478	// CacheDB::GetSHA256 - Get the SHA256 hash /{{{/
	479	// ---------------------------------------------------------------------
	480	/* */
	481	bool CacheDB::GetSHA512(bool const &GenOnly)
	482	{
	483	// Try to read the control information out of the DB.
	484	if ((CurStat.Flags & FlSHA512) == FlSHA512)
	485	{
	486	if (GenOnly == true)
	487	return true;
	488
	489	SHA512Res = bytes2hex(CurStat.SHA512, sizeof(CurStat.SHA512));
	490	return true;
	491	}
	492
	493	Stats.SHA512Bytes += CurStat.FileSize;
	494
215b0faf	495	if (OpenFile() == false)
9a961efc	496	return false;
215b0faf	497
9a961efc	498	SHA512Summation SHA512;
109eb151	499	if (Fd->Seek(0) == false \|\| SHA512.AddFD(*Fd, CurStat.FileSize) == false)
9a961efc MV	500	return false;
	501
	502	SHA512Res = SHA512.Result();
	503	hex2bytes(CurStat.SHA512, SHA512Res.data(), sizeof(CurStat.SHA512));
	504	CurStat.Flags \|= FlSHA512;
	505	return true;
	506	}
	507	/}}}/
b2e465d6 AL	508	// CacheDB::Finish - Write back the cache structure /{{{/
	509	// ---------------------------------------------------------------------
	510	/* */
	511	bool CacheDB::Finish()
	512	{
	513	// Optimize away some writes.
	514	if (CurStat.Flags == OldStat.Flags &&
9bfe66dc	515	CurStat.mtime == OldStat.mtime)
b2e465d6 AL	516	return true;
	517
	518	// Write the stat information
	519	CurStat.Flags = htonl(CurStat.Flags);
cde41ae8	520	CurStat.FileSize = htonl(CurStat.FileSize);
b2e465d6 AL	521	InitQuery("st");
	522	Put(&CurStat,sizeof(CurStat));
	523	CurStat.Flags = ntohl(CurStat.Flags);
cde41ae8 MV	524	CurStat.FileSize = ntohl(CurStat.FileSize);
cde41ae8 MV	525
b2e465d6 AL	526	return true;
	527	}
	528	/}}}/
	529	// CacheDB::Clean - Clean the Database /{{{/
	530	// ---------------------------------------------------------------------
	531	/* Tidy the database by removing files that no longer exist at all. */
	532	bool CacheDB::Clean()
	533	{
	534	if (DBLoaded == false)
	535	return true;
	536
	537	/* I'm not sure what VERSION_MINOR should be here.. 2.4.14 certainly
	538	needs the lower one and 2.7.7 needs the upper.. */
b2e465d6	539	DBC *Cursor;
c9569a1e	540	if ((errno = Dbp->cursor(Dbp, NULL, &Cursor, 0)) != 0)
dc738e7a	541	return _error->Error(_("Unable to get a cursor"));
b2e465d6 AL	542
	543	DBT Key;
	544	DBT Data;
	545	memset(&Key,0,sizeof(Key));
	546	memset(&Data,0,sizeof(Data));
	547	while ((errno = Cursor->c_get(Cursor,&Key,&Data,DB_NEXT)) == 0)
	548	{
592b401a MV	549	const char Colon = (char)memrchr(Key.data, ':', Key.size);
592b401a MV	550	if (Colon)
b2e465d6	551	{
592b401a MV	552	if (stringcmp(Colon + 1, (char *)Key.data+Key.size,"st") == 0 \|\|
	553	stringcmp(Colon + 1, (char *)Key.data+Key.size,"cl") == 0 \|\|
	554	stringcmp(Colon + 1, (char *)Key.data+Key.size,"cn") == 0)
b2e465d6	555	{
8f3ba4e8	556	if (FileExists(std::string((const char *)Key.data,Colon)) == true)
b2e465d6 AL	557	continue;
	558	}
	559	}
	560
	561	Cursor->c_del(Cursor,0);
	562	}
09fab244	563	Dbp->compact(Dbp, NULL, NULL, NULL, NULL, DB_FREE_SPACE, NULL);
b2e465d6 AL	564
	565	return true;
	566	}
	567	/}}}/