[apt-legacy.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/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 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()
{
	if ((CurStat.Flags & FlSize) == FlSize)
	{
		/* 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 FileName, bool DoControl, bool DoContents,
				bool GenContentsOnly, 
				bool DoMD5, bool DoSHA1, bool DoSHA256)
{
	this->FileName = FileName;

	if (GetCurStat() == false)
   {
		return false;
   }   
   OldStat = CurStat;
	
	if (GetFileStat() == false)
	{
		delete Fd;
		Fd = NULL;
		return false;	
	}

	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))
	{
		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 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 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++;
   } 
}

void *memrchr(void *data, char value, int size) {
    char *cdata = (char *) data;
    for (int i = 0; i != size; ++i)
        if (cdata[size - i - 1] == value)
            return cdata + size - i - 1;
    return NULL;
}

// CacheDB::GetMD5 - Get the MD5 hash					/*{{{*/
// ---------------------------------------------------------------------
/* */
bool CacheDB::GetMD5(bool 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 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 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::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
da6ee469 JF	1	// -- mode: cpp; mode: fold --
	2	// Description /{{{/
	3	// $Id: cachedb.cc,v 1.7 2004/05/08 19:41:01 mdz Exp $
	4	/* ######################################################################
	5
	6	CacheDB
	7
	8	Simple uniform interface to a cache database.
	9
	10	##################################################################### */
	11	/}}}/
	12	// Include Files /{{{/
da6ee469 JF	13	#include "cachedb.h"
	14
	15	#include <apti18n.h>
	16	#include <apt-pkg/error.h>
	17	#include <apt-pkg/md5.h>
	18	#include <apt-pkg/sha1.h>
	19	#include <apt-pkg/sha256.h>
	20	#include <apt-pkg/strutl.h>
	21	#include <apt-pkg/configuration.h>
	22
	23	#include <netinet/in.h> // htonl, etc
	24	/}}}/
	25
	26	// CacheDB::ReadyDB - Ready the DB2 /{{{/
	27	// ---------------------------------------------------------------------
	28	/* This opens the DB2 file for caching package information */
	29	bool CacheDB::ReadyDB(string DB)
	30	{
	31	int err;
	32
	33	ReadOnly = _config->FindB("APT::FTPArchive::ReadOnlyDB",false);
	34
	35	// Close the old DB
	36	if (Dbp != 0)
	37	Dbp->close(Dbp,0);
	38
	39	/* Check if the DB was disabled while running and deal with a
	40	corrupted DB */
	41	if (DBFailed() == true)
	42	{
	43	_error->Warning(_("DB was corrupted, file renamed to %s.old"),DBFile.c_str());
	44	rename(DBFile.c_str(),(DBFile+".old").c_str());
	45	}
	46
	47	DBLoaded = false;
	48	Dbp = 0;
	49	DBFile = string();
	50
	51	if (DB.empty())
	52	return true;
	53
	54	db_create(&Dbp, NULL, 0);
	55	if ((err = Dbp->open(Dbp, NULL, DB.c_str(), NULL, DB_BTREE,
	56	(ReadOnly?DB_RDONLY:DB_CREATE),
	57	0644)) != 0)
	58	{
	59	if (err == DB_OLD_VERSION)
	60	{
	61	_error->Warning(_("DB is old, attempting to upgrade %s"),DBFile.c_str());
	62	err = Dbp->upgrade(Dbp, DB.c_str(), 0);
	63	if (!err)
	64	err = Dbp->open(Dbp, NULL, DB.c_str(), NULL, DB_HASH,
	65	(ReadOnly?DB_RDONLY:DB_CREATE), 0644);
	66
	67	}
	68	// the database format has changed from DB_HASH to DB_BTREE in
	69	// apt 0.6.44
	70	if (err == EINVAL)
	71	{
0e5943eb	72	_error->Error(_("DB format is invalid. If you upgraded from an older version of apt, please remove and re-create the database."));
da6ee469 JF	73	}
	74	if (err)
	75	{
	76	Dbp = 0;
	77	return _error->Error(_("Unable to open DB file %s: %s"),DB.c_str(), db_strerror(err));
	78	}
	79	}
	80
	81	DBFile = DB;
	82	DBLoaded = true;
	83	return true;
	84	}
	85	/}}}/
0e5943eb	86	// CacheDB::OpenFile - Open the file /{{{/
da6ee469 JF	87	// ---------------------------------------------------------------------
	88	/* */
	89	bool CacheDB::OpenFile()
	90	{
	91	Fd = new FileFd(FileName,FileFd::ReadOnly);
	92	if (_error->PendingError() == true)
	93	{
	94	delete Fd;
	95	Fd = NULL;
	96	return false;
	97	}
	98	return true;
	99	}
	100	/}}}/
	101	// CacheDB::GetFileStat - Get stats from the file /{{{/
	102	// ---------------------------------------------------------------------
	103	/* This gets the size from the database if it's there. If we need
	104	* to look at the file, also get the mtime from the file. */
	105	bool CacheDB::GetFileStat()
	106	{
	107	if ((CurStat.Flags & FlSize) == FlSize)
	108	{
	109	/* Already worked out the file size */
	110	}
	111	else
	112	{
	113	/* Get it from the file. */
	114	if (Fd == NULL && OpenFile() == false)
	115	{
	116	return false;
	117	}
	118	// Stat the file
	119	struct stat St;
	120	if (fstat(Fd->Fd(),&St) != 0)
	121	{
	122	return _error->Errno("fstat",
	123	_("Failed to stat %s"),FileName.c_str());
	124	}
	125	CurStat.FileSize = St.st_size;
	126	CurStat.mtime = htonl(St.st_mtime);
	127	CurStat.Flags \|= FlSize;
	128	}
	129	return true;
	130	}
	131	/}}}/
	132	// CacheDB::GetCurStat - Set the CurStat variable. /{{{/
	133	// ---------------------------------------------------------------------
	134	/* Sets the CurStat variable. Either to 0 if no database is used
	135	* or to the value in the database if one is used */
	136	bool CacheDB::GetCurStat()
	137	{
	138	memset(&CurStat,0,sizeof(CurStat));
	139
	140	if (DBLoaded)
	141	{
0e5943eb	142	/* First see if there is anything about it
da6ee469 JF	143	in the database */
	144
	145	/* Get the flags (and mtime) */
	146	InitQuery("st");
	147	// Ensure alignment of the returned structure
	148	Data.data = &CurStat;
	149	Data.ulen = sizeof(CurStat);
	150	Data.flags = DB_DBT_USERMEM;
	151	if (Get() == false)
	152	{
	153	CurStat.Flags = 0;
	154	}
	155	CurStat.Flags = ntohl(CurStat.Flags);
	156	CurStat.FileSize = ntohl(CurStat.FileSize);
	157	}
	158	return true;
	159	}
	160	/}}}/
	161	// CacheDB::GetFileInfo - Get all the info about the file /{{{/
	162	// ---------------------------------------------------------------------
	163	bool CacheDB::GetFileInfo(string FileName, bool DoControl, bool DoContents,
	164	bool GenContentsOnly,
	165	bool DoMD5, bool DoSHA1, bool DoSHA256)
	166	{
	167	this->FileName = FileName;
	168
	169	if (GetCurStat() == false)
	170	{
	171	return false;
	172	}
	173	OldStat = CurStat;
	174
	175	if (GetFileStat() == false)
	176	{
	177	delete Fd;
	178	Fd = NULL;
	179	return false;
	180	}
	181
	182	Stats.Bytes += CurStat.FileSize;
	183	Stats.Packages++;
	184
0e5943eb JF	185	if ((DoControl && LoadControl() == false)
	186	\|\| (DoContents && LoadContents(GenContentsOnly) == false)
	187	\|\| (DoMD5 && GetMD5(false) == false)
	188	\|\| (DoSHA1 && GetSHA1(false) == false)
	189	\|\| (DoSHA256 && GetSHA256(false) == false))
da6ee469 JF	190	{
	191	delete Fd;
	192	Fd = NULL;
	193	delete DebFile;
	194	DebFile = NULL;
	195	return false;
	196	}
	197
	198	delete Fd;
	199	Fd = NULL;
	200	delete DebFile;
	201	DebFile = NULL;
	202
	203	return true;
	204	}
	205	/}}}/
	206	// CacheDB::LoadControl - Load Control information /{{{/
	207	// ---------------------------------------------------------------------
	208	/* */
	209	bool CacheDB::LoadControl()
	210	{
	211	// Try to read the control information out of the DB.
	212	if ((CurStat.Flags & FlControl) == FlControl)
	213	{
	214	// Lookup the control information
	215	InitQuery("cl");
	216	if (Get() == true && Control.TakeControl(Data.data,Data.size) == true)
	217	return true;
	218	CurStat.Flags &= ~FlControl;
	219	}
	220
	221	if (Fd == NULL && OpenFile() == false)
	222	{
	223	return false;
	224	}
	225	// Create a deb instance to read the archive
	226	if (DebFile == 0)
	227	{
	228	DebFile = new debDebFile(*Fd);
	229	if (_error->PendingError() == true)
	230	return false;
	231	}
	232
	233	Stats.Misses++;
	234	if (Control.Read(*DebFile) == false)
	235	return false;
	236
	237	if (Control.Control == 0)
	238	return _error->Error(_("Archive has no control record"));
	239
	240	// Write back the control information
	241	InitQuery("cl");
	242	if (Put(Control.Control,Control.Length) == true)
	243	CurStat.Flags \|= FlControl;
	244	return true;
	245	}
	246	/}}}/
	247	// CacheDB::LoadContents - Load the File Listing /{{{/
	248	// ---------------------------------------------------------------------
	249	/* */
	250	bool CacheDB::LoadContents(bool GenOnly)
	251	{
	252	// Try to read the control information out of the DB.
	253	if ((CurStat.Flags & FlContents) == FlContents)
254	{
255	if (GenOnly == true)
256	return true;
257
258	// Lookup the contents information
259	InitQuery("cn");
260	if (Get() == true)
261	{
262	if (Contents.TakeContents(Data.data,Data.size) == true)
263	return true;
264	}
265
266	CurStat.Flags &= ~FlContents;
267	}
268
269	if (Fd == NULL && OpenFile() == false)
270	{
271	return false;
272	}
273	// Create a deb instance to read the archive
274	if (DebFile == 0)
275	{
276	DebFile = new debDebFile(*Fd);
277	if (_error->PendingError() == true)
278	return false;
279	}
280
281	if (Contents.Read(*DebFile) == false)
282	return false;
283
284	// Write back the control information
285	InitQuery("cn");
286	if (Put(Contents.Data,Contents.CurSize) == true)
287	CurStat.Flags \|= FlContents;
288	return true;
289	}
290	/}}}/
291
292	static string bytes2hex(uint8_t *bytes, size_t length) {
293	char space[65];
294	if (length * 2 > sizeof(space) - 1) length = (sizeof(space) - 1) / 2;
295	for (size_t i = 0; i < length; i++)
296	snprintf(&space[i*2], 3, "%02x", bytes[i]);
297	return string(space);
298	}
299
300	static inline unsigned char xdig2num(char dig) {
301	if (isdigit(dig)) return dig - '0';
302	if ('a' <= dig && dig <= 'f') return dig - 'a' + 10;
303	if ('A' <= dig && dig <= 'F') return dig - 'A' + 10;
304	return 0;
305	}
306
307	static void hex2bytes(uint8_t bytes, const char hex, int length) {
308	while (length-- > 0) {
309	*bytes = 0;
310	if (isxdigit(hex[0]) && isxdigit(hex[1])) {
311	bytes = xdig2num(hex[0]) 16 + xdig2num(hex[1]);
312	hex += 2;
313	}
314	bytes++;
315	}
316	}
317
318	void memrchr(void data, char value, int size) {
319	char cdata = (char ) data;
320	for (int i = 0; i != size; ++i)
321	if (cdata[size - i - 1] == value)
322	return cdata + size - i - 1;
323	return NULL;
324	}
325
326	// CacheDB::GetMD5 - Get the MD5 hash /{{{/
327	// ---------------------------------------------------------------------
328	/* */
329	bool CacheDB::GetMD5(bool GenOnly)
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
337	MD5Res = bytes2hex(CurStat.MD5, sizeof(CurStat.MD5));
338	return true;
339	}
340
341	Stats.MD5Bytes += CurStat.FileSize;
342
343	if (Fd == NULL && OpenFile() == false)
344	{
345	return false;
346	}
347	MD5Summation MD5;
348	if (Fd->Seek(0) == false \|\| MD5.AddFD(Fd->Fd(),CurStat.FileSize) == false)
349	return false;
350
351	MD5Res = MD5.Result();
352	hex2bytes(CurStat.MD5, MD5Res.data(), sizeof(CurStat.MD5));
353	CurStat.Flags \|= FlMD5;
354	return true;
355	}
356	/}}}/
357	// CacheDB::GetSHA1 - Get the SHA1 hash /{{{/
358	// ---------------------------------------------------------------------
359	/* */
360	bool CacheDB::GetSHA1(bool GenOnly)
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	/* */
391	bool CacheDB::GetSHA256(bool GenOnly)
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	/}}}/
419	// CacheDB::Finish - Write back the cache structure /{{{/
420	// ---------------------------------------------------------------------
421	/* */
422	bool CacheDB::Finish()
423	{
424	// Optimize away some writes.
425	if (CurStat.Flags == OldStat.Flags &&
426	CurStat.mtime == OldStat.mtime)
427	return true;
428
429	// Write the stat information
430	CurStat.Flags = htonl(CurStat.Flags);
431	CurStat.FileSize = htonl(CurStat.FileSize);
432	InitQuery("st");
433	Put(&CurStat,sizeof(CurStat));
434	CurStat.Flags = ntohl(CurStat.Flags);
435	CurStat.FileSize = ntohl(CurStat.FileSize);
436
437	return true;
438	}
439	/}}}/
440	// CacheDB::Clean - Clean the Database /{{{/
441	// ---------------------------------------------------------------------
442	/* Tidy the database by removing files that no longer exist at all. */
443	bool CacheDB::Clean()
444	{
445	if (DBLoaded == false)
446	return true;
447
448	/* I'm not sure what VERSION_MINOR should be here.. 2.4.14 certainly
449	needs the lower one and 2.7.7 needs the upper.. */
450	DBC *Cursor;
451	if ((errno = Dbp->cursor(Dbp, NULL, &Cursor, 0)) != 0)
452	return _error->Error(_("Unable to get a cursor"));
453
454	DBT Key;
455	DBT Data;
456	memset(&Key,0,sizeof(Key));
457	memset(&Data,0,sizeof(Data));
458	while ((errno = Cursor->c_get(Cursor,&Key,&Data,DB_NEXT)) == 0)
459	{
460	const char Colon = (char)memrchr(Key.data, ':', Key.size);
461	if (Colon)
462	{
463	if (stringcmp(Colon + 1, (char *)Key.data+Key.size,"st") == 0 \|\|
464	stringcmp(Colon + 1, (char *)Key.data+Key.size,"cl") == 0 \|\|
465	stringcmp(Colon + 1, (char *)Key.data+Key.size,"cn") == 0)
466	{
467	if (FileExists(string((const char *)Key.data,Colon)) == true)
468	continue;
469	}
470	}
471
472	Cursor->c_del(Cursor,0);
473	}
0e5943eb	474	Dbp->compact(Dbp, NULL, NULL, NULL, NULL, DB_FREE_SPACE, NULL);
da6ee469 JF	475
	476	return true;
	477	}
	478	/}}}/