[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							/*{{{*/
#ifdef __GNUG__
#pragma implementation "cachedb.h"
#endif

#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 a 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 filei					/*{{{*/
// ---------------------------------------------------------------------
/* */
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 thre 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);
   }

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