Source record parsing

Author: jgg
Date: 1999-04-04 01:17:29 GMT
Source record parsing

1 files changed, 139 insertions, 0 deletions

diff --git a/apt-pkg/srcrecords.cc b/apt-pkg/srcrecords.cc
new file mode 100644
index 000000000..05be79a5a
--- /dev/null
+++ b/apt-pkg/srcrecords.cc
@@ -0,0 +1,139 @@
+// -*- mode: cpp; mode: fold -*-
+// Description								/*{{{*/
+// $Id: srcrecords.cc,v 1.1 1999/04/04 01:17:29 jgg Exp $
+/* ######################################################################
+   
+   Source Package Records - Allows access to source package records
+   
+   Parses and allows access to the list of source records and searching by
+   source name on that list.
+   
+   ##################################################################### */
+									/*}}}*/
+// Include Files							/*{{{*/
+#ifdef __GNUG__
+#pragma implementation "apt-pkg/srcrecords.h"
+#endif 
+
+#include <apt-pkg/srcrecords.h>
+#include <apt-pkg/error.h>
+#include <apt-pkg/configuration.h>
+#include <apt-pkg/strutl.h>
+#include <apt-pkg/debsrcrecords.h>
+									/*}}}*/
+
+// SrcRecords::pkgSrcRecords - Constructor				/*{{{*/
+// ---------------------------------------------------------------------
+/* Open all the source index files */
+pkgSrcRecords::pkgSrcRecords(pkgSourceList &List) : Files(0), Current(0)
+{
+   pkgSourceList::const_iterator I = List.begin();
+   
+   // Count how many items we will need
+   unsigned int Count = 0;
+   for (; I != List.end(); I++)
+      if (I->Type == pkgSourceList::Item::DebSrc)
+	 Count++;
+
+   // Doesnt work without any source index files
+   if (Count == 0)
+   {
+      _error->Error("Sorry, you must put some 'source' uris"
+		    " in your sources.list");
+      return;
+   }   
+
+   Files = new Parser *[Count+1];
+   memset(Files,0,sizeof(*Files)*(Count+1));
+   
+   // Create the parser objects
+   Count = 0;
+   string Dir = _config->FindDir("Dir::State::lists");
+   for (I = List.begin(); I != List.end(); I++)
+   {
+      if (I->Type != pkgSourceList::Item::DebSrc)
+	 continue;
+
+      // Open the file
+      FileFd *FD = new FileFd(Dir + URItoFileName(I->PackagesURI()),
+			      FileFd::ReadOnly);
+      if (_error->PendingError() == true)
+      {
+	 delete FD;
+	 return;
+      }
+      
+      Files[Count] = new debSrcRecordParser(FD);
+      Count++;
+   }
+   
+   Restart();
+}
+									/*}}}*/
+// SrcRecords::~pkgSrcRecords - Destructor				/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+pkgSrcRecords::~pkgSrcRecords()
+{
+   if (Files == 0)
+      return;
+
+   // Blow away all the parser objects
+   for (unsigned int Count = 0; Files[Count] != 0; Count++)
+      delete Files[Count];
+}
+									/*}}}*/
+// SrcRecords::Restart - Restart the search				/*{{{*/
+// ---------------------------------------------------------------------
+/* Return all of the parsers to their starting position */
+bool pkgSrcRecords::Restart()
+{
+   Current = Files;
+   for (Parser **I = Files; *I != 0; I++)
+      if ((*I)->Restart() == false)
+	 return false;
+   return true;
+}
+									/*}}}*/
+// SrcRecords::Find - Find the first source package with the given name	/*{{{*/
+// ---------------------------------------------------------------------
+/* This searches on both source package names and output binary names and
+   returns the first found. A 'cursor' like system is used to allow this
+   function to be called multiple times to get successive entries */
+pkgSrcRecords::Parser *pkgSrcRecords::Find(const char *Package,bool SrcOnly)
+{
+   if (*Current == 0)
+      return 0;
+   
+   while (true)
+   {
+      // Step to the next record, possibly switching files
+      while ((*Current)->Step() == false)
+      {
+	 if (_error->PendingError() == true)
+	    return 0;
+	 Current++;
+	 if (*Current == 0)
+	    return 0;
+      }
+      
+      // IO error somehow
+      if (_error->PendingError() == true)
+	 return 0;
+
+      // Source name hit
+      if ((*Current)->Package() == Package)
+	 return *Current;
+      
+      if (SrcOnly == true)
+	 continue;
+      
+      // Check for a binary hit
+      const char **I = (*Current)->Binaries();
+      for (; I != 0 && *I != 0; I++)
+	 if (strcmp(Package,*I) == 0)
+	    return *Current;
+   }
+}
+									/*}}}*/
+